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New concepts in Jaw Crusher technology
Mmeral,~ Engineering. Vol. 3, No. I/2, pp. 67 74, 1990 Printed in Great Britain
0892-6875/90 $3.00 + 0.00 @ 1990 Pergamon Press plc
NEW CONCEPTS IN JAW CRUSHER TECHNOLOGY
R. B. DeDIEMAR President, K U E - K E N Corporation, Oakland, CA, U.S.A.
ABSTRACT New ideas in primary Jaw Crusher design - Design and manufacture of 66inch x 84-inch (167.64-cm x 213.36-cm) Jaw Crusher utilizing open feed throat concept, power savings and automation features
Keywords Jaw crushers; Kue-Ken; 'Big-Bite' crusher INTRODUCTION In today's comminution environment the need for new ideas in very large primary jaw crusher designs, to meet the economics of modern mining and quarrying requirements has become imperative. This paper will deal with the aspects of and the rational for, the development of the K U E - K E N (R) "BIG BITE" (R) jaw crusher [1]. Its innovative open throat design combines the greatest possible use of force for crushing with extremely high feed capacity and total access to the crushing chamber to minimize downtime and maximize efficiency. K U E - K E N CORPORATION - 80 YEARS OF COMMINUTION EXPERIENCE To fully understand the evolution of the modified double toggle jaw crusher concept, it is important to briefly state the history of the K U E - K E N Corporation. The company was founded as the Straub Manufacturing Company in Oakland, California, USA in 1909. The original purpose of the company was to design and manufacture innovative mining equipment for use in the United States and eventually Central and South America. The first machinery designed and built included the Rib-Cone brand of ball mills, classifiers, concentrators and stamp mills together with such ancillary equipment as steam boilers, melting furnaces and sintering hearths, vibrating screens and feeders. The company's marketing concept was based on the sectionalization of component parts to meet the transportation capabilities of the early 1900's. Hence, the original company slogan of "anywhere a mule can go" as illustrated in Figure 1. The innovative spirit of the company can best be illustrated by noting that, in the early 1940's, a completely sectionalized plant including crushers, feeders, mill and diesel generators was parachuted into a remote Alaska mining area. Each section was wrapped in mattresses and parachuted from a plane at an altitude of 5000 feet for a completely safe delivery - one of the first commercial air drops in history. 67
68
R . B . DEDIEMAR
KUE.KEN Kue-Ken ® (kyoo'ken), n., org. E., tradename. 1. Mfg. of jaw crusher that crushes rock, minerals, aggregates and glass to specified size. 2. Mfg. of jaw crusher that saves energy and money. 3. a crusher that increases jaw plate life.--Syn. 1. crushing-without-rubbing, low operating cost, little downtime.
Fig.l Original "slogan" of the Straub Manufacturing Company, ancestor of the K U E - K E N Corporation The company's eventual focus was on the development of the modified double toggle jaw crusher design that is known in the industry today by the K U E - K E N brand name. The original patents were issued in the early 1940's. The purpose of the modified double toggle jaw crusher design was to produce maximum crushing force without encountering the rubbing action experienced with earlier BlakeType or Overhead Eccentric jaw crushers. It was theorized in proven that such rubbing was non-productive and resulted in excess horsepower requirements and excess jaw plate wear (see Figure 2). In 1978, Straub Manufacturing became part of the PROCESS TECHNOLOGY GROUP and is now known as the K U E - K E N Corporation, of Oakland, CA so named because of the strong recognition of the original K U E - K E N brand name. The PROCESS TECHNOLOGY GROUP, in turn, is a subsidiary of the R.J. Dick Corporation which is also the parent of Hewitt Robins whose United Kingdom operations are based in Glasgow as Hewitt Robins International. BIG BITE Jaw Crushers are manufactured by Hewitt-Robins International under license from K U E - K E N Corp./USA. The K u e - K e n corporate focus is on improved jaw and cone crusher technology. Development of A New Jaw Crusher Technology Today, the need for a primary jaw crusher truly capable of taking large run-of mine or run-of-quarry rock and starting the size reduction process is greater than ever. According to Taggart [2], a well-designed crushing machine should be capable of receiving the largest piece the mine or quarry can send along. In practice, however, many primary jaw crushers are hindered in this performance due to their inherent design. Some designs have an internal geometry which actually creates a "neutral zone" and a high wear zone as shown in Figure 3. Other designs, because of their internal geometry, have "zero" or very minimal crushing strokes at the feed entrance (Figure 4).
New concepts in jaw crusher technology
69
POWER CALCULATIONS EXAMPLE: 30" x 4 2 " Jew Crusher @ 5" C.S.S.1225 TPH Feed:
Maximum Particle (30 x 9) = 27" 80% Passing (30 × 6) = 18 •
Producl:
80% Passing 5-112" @ 5" C S S )
HP" = ~ p ~ 3 4
Wi
__
~
x
TPH
OR HP
=(
1_3_.4x 13.8
HP
= I 1_B4.9
~ x 2 2 5
__
(.495 -
x 225
184.9 ~
13r3.8
~_2 I
HP
=
HP
=
Wl
=
Work Index AS determined by laboratory tests. 13 8 is approximate average of all materlaqS tested
F
=
Size of feed of which 80% is smaller (In Microns)
P
=
S~zeol product which 80% is smaller (In Microns)
1"
:
25,400 Microns 13 4 is a conslant.
.273) x 225
S0
• Based on F C Bond's Third Theory OI Comrninution Note: This calculation yields horsepower tO crush {he slone only. Mechanical power to operale 1he crusher MUST be added Io Ihe above!
Fig.2 Power Calculations
OVERHEAD ECCENTRIC ~_ CHAMBER
- - + -
STATIONARY
,~w
'5
SWING J
_Y_
BLAKETYPE DOUBLETOGGLE CHAMBER
MOOIFIED DOUBLETOGGLE
CHAMBER
•!/
........ STATIONARY JAW ~.
NEUTRAL J ZONE
COMPRESSION STROKE
2 / OKE
ECCENTRIC STROKE
Fig.3 Typical overhead eccentric swing jaw configuration
Fig.4 Typical Blake-type swing jaw configuration
Fig.5 Typical modified double toggle swing jaw configuration
Thus, a jaw crusher rated as having a 66-inch x 84 inch feed opening and having a full access throat with an effective crushing stroke at the feed entrance has been needed by the mining and quarrying industries for most of this century (Figure 5). Another possible solution to this requirement is the gyratory-type primary crusher which has several inherent limitations. Even though a gyratory crusher can have a higher throughput capacity than a jaw crusher, its overall large size and resultant higher weight as shown in Figure 6 are factors that combine with price to make it a less attractive solution to the large size feed requirement.
70
R.B. DEDIEMAR
60"x90"
~i ~--~-~ ii
--~ 7 j,
54~7S"
Fig.6 Size comparison - BIG BITE 66x84 Model 440X versus a comparable gyratory crusher The Evolution of the "BIG-BITE" Jaw Crusher Concept. To meet the demands of mining and quarrying operations for a primary jaw crusher that will accept larger feed sizes, K U E - K E N began a machine design evolution that can best be described as being based on "a tried and proven new idea." Adopting Einstein's principal that everything should be kept as simple as possible, but no simpler, the K U E - K E N design team viewed the possibility of modifying the modified double toggle jaw crusher. After intensive critical analysis it became apparent that a single, but innovative, change in the basic K U E - K E N swing jaw configuration was the only requirement. In effect, the swing jaw was modified to be suspended on its hinge pin from the outside of the crusher as shown in Figure 7.
New concepts in jaw crusher technology
71
Fig.7 BIG BITE modified linear swing jaw configuration The result was a dramatic gain in feed capacity because the machine now fully utilizes the open feed throat concept. The entire jaw opening between the side cheek plates can now be used. This configuration of the swing jaw greatly increases the capacity of the machine's throat to accept whatever slabs, elongated pieces and asymmetrical rock the mine or quarry can send along and process them with maximum in-line crushing force through the entire length of the crushing chamber. This new linear jaw design also makes complete access to the crushing chamber possible to simplify the removal of problem pieces. The "BIG BITE" design was submitted for patent registration in 1987 and the first models were built and field-tested the same year in several locations using feed materials of highly varied friability and shapes (Figure 8).
Fig.8 Field Testing BIG BITE
72
R . B . DEDIEMAR
After excellent field test results, the first "BIG BITE" production units were introduced to the industry in January of 1988 at the ConAgg Exhibition in Houston, Texas. The first units were also sold in 1988 and have been in operation ever since in mines and quarries in the United States and in the United Kingdom. 1988-1989 shipments, production and back-orders for this "tried and proven new jaw crusher" have presented gratifying proof of its perceived value to today's comminution applications versus gyratory-type machines. The "BIG BITE" Design Makes Lar~er Jaw Crushers Possible Although the earlier "BIG BITE" models were smaller than the Model 440X that we are now about to present, they were able to accept larger feeds and produce greater throughput than previous designs. Late in 1988 a limestone quarry operation near Kansas City, Missouri, U.S.A. requested the K U E - K E N Corporation to design and build the largest primary jaw crusher produced in the United States over the past twenty-five years. This unit, known as the BIG-BITE 66x84 Model 440X, is now nearing construction completion and is scheduled for final assembly, installation and start-up in late 1989. Figures 9 and 10 show views of the machine, whose construction requires techniques similar to, but on a larger scale than those required to build a modern day main battle tank!
I !
I t
I
I
~J
Fig.9 66x84 Model 440X size comparison with an average human To put this huge BIG-BITE jaw crusher into perspective, bear in mind that it measures 18 feet, 4 inches (5.592 m) high; 23 feet 1-1/2 inch (7.065 m) long and 15 feet, 1 inch (4.600 m) wide. Assembled, it will weigh 410,000 pounds (184,500 kg), yet it requires only 350 400 hp for operation. It will be rated at 900 to 1200 short tons (828 to 1104 tonnes) per hour at a 10 inch (25.4 cm) closed side setting. It will operate at 200 rpm with a 1-1/2" (3.81 cm) stroke. Figure 10 will illustrate the main operating advantages of the machine. It is interesting to note that the immense size of the BIG- BITE Model 440X required another "tried and tested new idea" originally pioneered by Kue-Ken's ancestor, the Straub Manufacturing Company. For example, the Swing Jaw for the Model 440X is too large to be transported in one piece. Thus, it was sectionalized and fabricated in two pieces to be on-site assembled. Note that the jaw's final assembly incorporates bolting along the neutral axis to minimize stress within the bolt system.
New concepts in jaw crusher technology
73
Hinge Pin
\
// I" I
'.t
I_1
L t L~ i l / iL
J.J
,
oj 1
i
i
i I
tt ii
iI iI
I
i
ii i t
i ,.,i
'1 I
"1
t t_
Ii It tI
/
i
, ,~
.It
ill t
'
//s Z / I r
I
i(
I* tl
L~
tl
I
'
ii
tI
it
iI
t~, /111 IL
I
Stationery Jaw with Hydraulic Adjustment
S~wing Jaw
Fig.10 Main Operating Features of the 66x84 440X The BIG BITE 440X also requires a sectionalized frame design that incorporates both Electroslag and MIG welding techniques. Referring to Figure 10, the patented Safety Overload Release (1) protects the toggles from overload and breakage caused by tramp iron or other uncrushable materials. The Double Toggle "Engine Room" (2) drives the swing jaw. These precision machined and aligned toggles and toggle seats are virtually unbreakable because they are protected by the Flywheel's Overload Release System. The entire toggle system is sealed in a flood lubrication assembly to allow the crusher to run cooler than older designs at 25% to 60% more strokes per minute. Next, the Unrestricted Feed Opening (3) permits maximum use of the crushing chamber for slabby materials, usually relegated to gyratory machines in the past, as well as elongated and asymmetrical shapes. The maximum feed size recommended (4) for the 66 x 84 feed opening is 52 inches to 54 inches (132.08 cm to 137.16 cm) and can accommodate virtually any shape the mine or quarry will send along for reduction. The In-Line Crushing Force applied throughout the crushing chamber (5) is derived from the innovative outside-supported linear swing jaw design and the proper location and geometry of the hinge pin. The Advantages of the Double Toggle Open Throat Jaw Crusher In comparison to the more traditional gyratory crusher, which is essentially a jaw crusher wound symmetrically around a vertical axis through the swing jaw; the true jaw has the
74
R . B . DED1EMAR
advantage of the toggle joints so essential in the chain of force multiplication. Although, the gyratory crusher uses a second lever concept, namely the bevel gear and eccentric to compensate for the loss in force multiplication by the absence of toggle joints, it does not supply the corresponding ability to apply the theoretically infinite forces which the toggle joint supplies to the jaw crusher [3]. SUMMARY This latest K U E - K E N improvement on the already proven modified double toggle jaw crusher design will permit significant advances in the art and economics of rock and ore crushing in terms of capacity, throughput, and feed size to more truly approach the ideal for a well-designed Primary Jaw Crusher Station required by the industry. REFERENCES .
BIG-BITE is a registered trade mark of the K U E - K E N Corporation. K U E - K E N is a registered trade mark of the K U E - K E N Corporation (except in the United Kingdom)
.
Taggart A.F. Elements of Ore Dressing, 2nd Edition, 341, John Wiley & Sons, Inc. (1958)
.
Taggart A.F. Elements of Ore Dressing, 2nd Edition, 358, John Wiley & Sons, Inc. (1958)
0892-6875/90 $3.00 + 0.00 @ 1990 Pergamon Press plc
NEW CONCEPTS IN JAW CRUSHER TECHNOLOGY
R. B. DeDIEMAR President, K U E - K E N Corporation, Oakland, CA, U.S.A.
ABSTRACT New ideas in primary Jaw Crusher design - Design and manufacture of 66inch x 84-inch (167.64-cm x 213.36-cm) Jaw Crusher utilizing open feed throat concept, power savings and automation features
Keywords Jaw crushers; Kue-Ken; 'Big-Bite' crusher INTRODUCTION In today's comminution environment the need for new ideas in very large primary jaw crusher designs, to meet the economics of modern mining and quarrying requirements has become imperative. This paper will deal with the aspects of and the rational for, the development of the K U E - K E N (R) "BIG BITE" (R) jaw crusher [1]. Its innovative open throat design combines the greatest possible use of force for crushing with extremely high feed capacity and total access to the crushing chamber to minimize downtime and maximize efficiency. K U E - K E N CORPORATION - 80 YEARS OF COMMINUTION EXPERIENCE To fully understand the evolution of the modified double toggle jaw crusher concept, it is important to briefly state the history of the K U E - K E N Corporation. The company was founded as the Straub Manufacturing Company in Oakland, California, USA in 1909. The original purpose of the company was to design and manufacture innovative mining equipment for use in the United States and eventually Central and South America. The first machinery designed and built included the Rib-Cone brand of ball mills, classifiers, concentrators and stamp mills together with such ancillary equipment as steam boilers, melting furnaces and sintering hearths, vibrating screens and feeders. The company's marketing concept was based on the sectionalization of component parts to meet the transportation capabilities of the early 1900's. Hence, the original company slogan of "anywhere a mule can go" as illustrated in Figure 1. The innovative spirit of the company can best be illustrated by noting that, in the early 1940's, a completely sectionalized plant including crushers, feeders, mill and diesel generators was parachuted into a remote Alaska mining area. Each section was wrapped in mattresses and parachuted from a plane at an altitude of 5000 feet for a completely safe delivery - one of the first commercial air drops in history. 67
68
R . B . DEDIEMAR
KUE.KEN Kue-Ken ® (kyoo'ken), n., org. E., tradename. 1. Mfg. of jaw crusher that crushes rock, minerals, aggregates and glass to specified size. 2. Mfg. of jaw crusher that saves energy and money. 3. a crusher that increases jaw plate life.--Syn. 1. crushing-without-rubbing, low operating cost, little downtime.
Fig.l Original "slogan" of the Straub Manufacturing Company, ancestor of the K U E - K E N Corporation The company's eventual focus was on the development of the modified double toggle jaw crusher design that is known in the industry today by the K U E - K E N brand name. The original patents were issued in the early 1940's. The purpose of the modified double toggle jaw crusher design was to produce maximum crushing force without encountering the rubbing action experienced with earlier BlakeType or Overhead Eccentric jaw crushers. It was theorized in proven that such rubbing was non-productive and resulted in excess horsepower requirements and excess jaw plate wear (see Figure 2). In 1978, Straub Manufacturing became part of the PROCESS TECHNOLOGY GROUP and is now known as the K U E - K E N Corporation, of Oakland, CA so named because of the strong recognition of the original K U E - K E N brand name. The PROCESS TECHNOLOGY GROUP, in turn, is a subsidiary of the R.J. Dick Corporation which is also the parent of Hewitt Robins whose United Kingdom operations are based in Glasgow as Hewitt Robins International. BIG BITE Jaw Crushers are manufactured by Hewitt-Robins International under license from K U E - K E N Corp./USA. The K u e - K e n corporate focus is on improved jaw and cone crusher technology. Development of A New Jaw Crusher Technology Today, the need for a primary jaw crusher truly capable of taking large run-of mine or run-of-quarry rock and starting the size reduction process is greater than ever. According to Taggart [2], a well-designed crushing machine should be capable of receiving the largest piece the mine or quarry can send along. In practice, however, many primary jaw crushers are hindered in this performance due to their inherent design. Some designs have an internal geometry which actually creates a "neutral zone" and a high wear zone as shown in Figure 3. Other designs, because of their internal geometry, have "zero" or very minimal crushing strokes at the feed entrance (Figure 4).
New concepts in jaw crusher technology
69
POWER CALCULATIONS EXAMPLE: 30" x 4 2 " Jew Crusher @ 5" C.S.S.1225 TPH Feed:
Maximum Particle (30 x 9) = 27" 80% Passing (30 × 6) = 18 •
Producl:
80% Passing 5-112" @ 5" C S S )
HP" = ~ p ~ 3 4
Wi
__
~
x
TPH
OR HP
=(
1_3_.4x 13.8
HP
= I 1_B4.9
~ x 2 2 5
__
(.495 -
x 225
184.9 ~
13r3.8
~_2 I
HP
=
HP
=
Wl
=
Work Index AS determined by laboratory tests. 13 8 is approximate average of all materlaqS tested
F
=
Size of feed of which 80% is smaller (In Microns)
P
=
S~zeol product which 80% is smaller (In Microns)
1"
:
25,400 Microns 13 4 is a conslant.
.273) x 225
S0
• Based on F C Bond's Third Theory OI Comrninution Note: This calculation yields horsepower tO crush {he slone only. Mechanical power to operale 1he crusher MUST be added Io Ihe above!
Fig.2 Power Calculations
OVERHEAD ECCENTRIC ~_ CHAMBER
- - + -
STATIONARY
,~w
'5
SWING J
_Y_
BLAKETYPE DOUBLETOGGLE CHAMBER
MOOIFIED DOUBLETOGGLE
CHAMBER
•!/
........ STATIONARY JAW ~.
NEUTRAL J ZONE
COMPRESSION STROKE
2 / OKE
ECCENTRIC STROKE
Fig.3 Typical overhead eccentric swing jaw configuration
Fig.4 Typical Blake-type swing jaw configuration
Fig.5 Typical modified double toggle swing jaw configuration
Thus, a jaw crusher rated as having a 66-inch x 84 inch feed opening and having a full access throat with an effective crushing stroke at the feed entrance has been needed by the mining and quarrying industries for most of this century (Figure 5). Another possible solution to this requirement is the gyratory-type primary crusher which has several inherent limitations. Even though a gyratory crusher can have a higher throughput capacity than a jaw crusher, its overall large size and resultant higher weight as shown in Figure 6 are factors that combine with price to make it a less attractive solution to the large size feed requirement.
70
R.B. DEDIEMAR
60"x90"
~i ~--~-~ ii
--~ 7 j,
54~7S"
Fig.6 Size comparison - BIG BITE 66x84 Model 440X versus a comparable gyratory crusher The Evolution of the "BIG-BITE" Jaw Crusher Concept. To meet the demands of mining and quarrying operations for a primary jaw crusher that will accept larger feed sizes, K U E - K E N began a machine design evolution that can best be described as being based on "a tried and proven new idea." Adopting Einstein's principal that everything should be kept as simple as possible, but no simpler, the K U E - K E N design team viewed the possibility of modifying the modified double toggle jaw crusher. After intensive critical analysis it became apparent that a single, but innovative, change in the basic K U E - K E N swing jaw configuration was the only requirement. In effect, the swing jaw was modified to be suspended on its hinge pin from the outside of the crusher as shown in Figure 7.
New concepts in jaw crusher technology
71
Fig.7 BIG BITE modified linear swing jaw configuration The result was a dramatic gain in feed capacity because the machine now fully utilizes the open feed throat concept. The entire jaw opening between the side cheek plates can now be used. This configuration of the swing jaw greatly increases the capacity of the machine's throat to accept whatever slabs, elongated pieces and asymmetrical rock the mine or quarry can send along and process them with maximum in-line crushing force through the entire length of the crushing chamber. This new linear jaw design also makes complete access to the crushing chamber possible to simplify the removal of problem pieces. The "BIG BITE" design was submitted for patent registration in 1987 and the first models were built and field-tested the same year in several locations using feed materials of highly varied friability and shapes (Figure 8).
Fig.8 Field Testing BIG BITE
72
R . B . DEDIEMAR
After excellent field test results, the first "BIG BITE" production units were introduced to the industry in January of 1988 at the ConAgg Exhibition in Houston, Texas. The first units were also sold in 1988 and have been in operation ever since in mines and quarries in the United States and in the United Kingdom. 1988-1989 shipments, production and back-orders for this "tried and proven new jaw crusher" have presented gratifying proof of its perceived value to today's comminution applications versus gyratory-type machines. The "BIG BITE" Design Makes Lar~er Jaw Crushers Possible Although the earlier "BIG BITE" models were smaller than the Model 440X that we are now about to present, they were able to accept larger feeds and produce greater throughput than previous designs. Late in 1988 a limestone quarry operation near Kansas City, Missouri, U.S.A. requested the K U E - K E N Corporation to design and build the largest primary jaw crusher produced in the United States over the past twenty-five years. This unit, known as the BIG-BITE 66x84 Model 440X, is now nearing construction completion and is scheduled for final assembly, installation and start-up in late 1989. Figures 9 and 10 show views of the machine, whose construction requires techniques similar to, but on a larger scale than those required to build a modern day main battle tank!
I !
I t
I
I
~J
Fig.9 66x84 Model 440X size comparison with an average human To put this huge BIG-BITE jaw crusher into perspective, bear in mind that it measures 18 feet, 4 inches (5.592 m) high; 23 feet 1-1/2 inch (7.065 m) long and 15 feet, 1 inch (4.600 m) wide. Assembled, it will weigh 410,000 pounds (184,500 kg), yet it requires only 350 400 hp for operation. It will be rated at 900 to 1200 short tons (828 to 1104 tonnes) per hour at a 10 inch (25.4 cm) closed side setting. It will operate at 200 rpm with a 1-1/2" (3.81 cm) stroke. Figure 10 will illustrate the main operating advantages of the machine. It is interesting to note that the immense size of the BIG- BITE Model 440X required another "tried and tested new idea" originally pioneered by Kue-Ken's ancestor, the Straub Manufacturing Company. For example, the Swing Jaw for the Model 440X is too large to be transported in one piece. Thus, it was sectionalized and fabricated in two pieces to be on-site assembled. Note that the jaw's final assembly incorporates bolting along the neutral axis to minimize stress within the bolt system.
New concepts in jaw crusher technology
73
Hinge Pin
\
// I" I
'.t
I_1
L t L~ i l / iL
J.J
,
oj 1
i
i
i I
tt ii
iI iI
I
i
ii i t
i ,.,i
'1 I
"1
t t_
Ii It tI
/
i
, ,~
.It
ill t
'
//s Z / I r
I
i(
I* tl
L~
tl
I
'
ii
tI
it
iI
t~, /111 IL
I
Stationery Jaw with Hydraulic Adjustment
S~wing Jaw
Fig.10 Main Operating Features of the 66x84 440X The BIG BITE 440X also requires a sectionalized frame design that incorporates both Electroslag and MIG welding techniques. Referring to Figure 10, the patented Safety Overload Release (1) protects the toggles from overload and breakage caused by tramp iron or other uncrushable materials. The Double Toggle "Engine Room" (2) drives the swing jaw. These precision machined and aligned toggles and toggle seats are virtually unbreakable because they are protected by the Flywheel's Overload Release System. The entire toggle system is sealed in a flood lubrication assembly to allow the crusher to run cooler than older designs at 25% to 60% more strokes per minute. Next, the Unrestricted Feed Opening (3) permits maximum use of the crushing chamber for slabby materials, usually relegated to gyratory machines in the past, as well as elongated and asymmetrical shapes. The maximum feed size recommended (4) for the 66 x 84 feed opening is 52 inches to 54 inches (132.08 cm to 137.16 cm) and can accommodate virtually any shape the mine or quarry will send along for reduction. The In-Line Crushing Force applied throughout the crushing chamber (5) is derived from the innovative outside-supported linear swing jaw design and the proper location and geometry of the hinge pin. The Advantages of the Double Toggle Open Throat Jaw Crusher In comparison to the more traditional gyratory crusher, which is essentially a jaw crusher wound symmetrically around a vertical axis through the swing jaw; the true jaw has the
74
R . B . DED1EMAR
advantage of the toggle joints so essential in the chain of force multiplication. Although, the gyratory crusher uses a second lever concept, namely the bevel gear and eccentric to compensate for the loss in force multiplication by the absence of toggle joints, it does not supply the corresponding ability to apply the theoretically infinite forces which the toggle joint supplies to the jaw crusher [3]. SUMMARY This latest K U E - K E N improvement on the already proven modified double toggle jaw crusher design will permit significant advances in the art and economics of rock and ore crushing in terms of capacity, throughput, and feed size to more truly approach the ideal for a well-designed Primary Jaw Crusher Station required by the industry. REFERENCES .
BIG-BITE is a registered trade mark of the K U E - K E N Corporation. K U E - K E N is a registered trade mark of the K U E - K E N Corporation (except in the United Kingdom)
.
Taggart A.F. Elements of Ore Dressing, 2nd Edition, 341, John Wiley & Sons, Inc. (1958)
.
Taggart A.F. Elements of Ore Dressing, 2nd Edition, 358, John Wiley & Sons, Inc. (1958)