CA1091207A - Jaw plate structure for jaw crushers - Google Patents
Jaw plate structure for jaw crushersInfo
- Publication number
- CA1091207A CA1091207A CA292,952A CA292952A CA1091207A CA 1091207 A CA1091207 A CA 1091207A CA 292952 A CA292952 A CA 292952A CA 1091207 A CA1091207 A CA 1091207A
- Authority
- CA
- Canada
- Prior art keywords
- base
- jaw
- pitch
- plate structure
- jaw plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C1/00—Crushing or disintegrating by reciprocating members
- B02C1/02—Jaw crushers or pulverisers
- B02C1/10—Shape or construction of jaws
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
JAW PLATE STRUCTURE FOR JAW CRUSHERS
ABSTRACT OF THE DISCLOSURE
A jaw plate structure for use in the coacting jaws of a jaw crusher comprises a base of high manganese cast iron or low-alloy steel which has a corrugated crushing surface, and a multiplicity of blocks of cast chromium cast iron em-bedded in the crushing surface of the base so as to ex-tend along the ridges of its corrugations. The pertinent dimensions of this jaw plate structure are specified in relation to the pitch of the crushing surface corrugations, with a view to utmost crushing performance and durability.
ABSTRACT OF THE DISCLOSURE
A jaw plate structure for use in the coacting jaws of a jaw crusher comprises a base of high manganese cast iron or low-alloy steel which has a corrugated crushing surface, and a multiplicity of blocks of cast chromium cast iron em-bedded in the crushing surface of the base so as to ex-tend along the ridges of its corrugations. The pertinent dimensions of this jaw plate structure are specified in relation to the pitch of the crushing surface corrugations, with a view to utmost crushing performance and durability.
Description
Z0~7 BAC~GROUND OF TIIE INVENTION
This invention relates to crushers, to primary crusher~, and to jaw crushers or jaw breakers for crushing bulk materials such as rock and ores. More specifically, the invention deals with an impro~ed jaw plate structure for use in the opposed, coacting jaws of jaw crushers such as those of the overhead eccentric or single toggle type or the Blake type.
The pair of opposed jaw plates of a jaw crusher are usually pro-vided with corrugated crushing surace so that the bulk material fed may be readily crushed therebetween. The ridges of the corrugated crushing surfaces are, of course, subject tG more rapid wear than their furrows or grooves in the case where the jaw plates are of homogeneous ~aterial. As a consequence, the crushing surfaces of such jaw plates readily become flat.
This is undesirable since the crushing performance of the jaw crusher generally declines with the progress of the flattening of the crushing surfaces, until the particle size of the product becomes far greater than the setting.
The jaw plates with their corruga~ed crushing surfaces have customarily been cast rom such matcrials as high manganese cast steel, low-alloy cast steel, and high chromium cast irons. Of these materials, high manganese cast steel and low-alloy cast steel are more ductile than high chromium cast iron and thereore comparatively immune to fracture but are rather unsatisfactory in wear resistance. High chromium cast iron , on the other hand, is more wear-resistant than high manganese cast steel or low-alloy cast steel but, at the same time, is more brittle and therefore more vulnerable to fracture.
In view of the above explained properties of the listed steel materials, a proposal has been made in Japanese Utility Model Application Laid Open No. 48-1~1260 ~101260/1973) to provide a jaw plate comprising a base which is cast from high manganese cast steel or low-alloy cast steel, and which has a corrugated crushing surface, and a multiplicity of blocks of high chromium cast iron which are embedded in the ridges of the crushing surface of the base. According to this known jaw plate structure, the ridges
This invention relates to crushers, to primary crusher~, and to jaw crushers or jaw breakers for crushing bulk materials such as rock and ores. More specifically, the invention deals with an impro~ed jaw plate structure for use in the opposed, coacting jaws of jaw crushers such as those of the overhead eccentric or single toggle type or the Blake type.
The pair of opposed jaw plates of a jaw crusher are usually pro-vided with corrugated crushing surace so that the bulk material fed may be readily crushed therebetween. The ridges of the corrugated crushing surfaces are, of course, subject tG more rapid wear than their furrows or grooves in the case where the jaw plates are of homogeneous ~aterial. As a consequence, the crushing surfaces of such jaw plates readily become flat.
This is undesirable since the crushing performance of the jaw crusher generally declines with the progress of the flattening of the crushing surfaces, until the particle size of the product becomes far greater than the setting.
The jaw plates with their corruga~ed crushing surfaces have customarily been cast rom such matcrials as high manganese cast steel, low-alloy cast steel, and high chromium cast irons. Of these materials, high manganese cast steel and low-alloy cast steel are more ductile than high chromium cast iron and thereore comparatively immune to fracture but are rather unsatisfactory in wear resistance. High chromium cast iron , on the other hand, is more wear-resistant than high manganese cast steel or low-alloy cast steel but, at the same time, is more brittle and therefore more vulnerable to fracture.
In view of the above explained properties of the listed steel materials, a proposal has been made in Japanese Utility Model Application Laid Open No. 48-1~1260 ~101260/1973) to provide a jaw plate comprising a base which is cast from high manganese cast steel or low-alloy cast steel, and which has a corrugated crushing surface, and a multiplicity of blocks of high chromium cast iron which are embedded in the ridges of the crushing surface of the base. According to this known jaw plate structure, the ridges
-2- ~
L20'7 of the corrugated crushing surface is more wear resistant than its furrows, so that the difference in height between thc ridges and furrows can be maintained for a greater period of time than with the jaw plates of homog-eneous material.
A problem has been encountercd, howevcr, in the dimensioning of the jaw plates according to the above mentioned Japanese utility model application. Since jaw crushers in general are required to handle materials of widely varying hardness and other properties, the dimensions of the jaw plates ~i.e., those of the bases and the blocks) have been determined on a purely empirical basis. The performance and durability of the jaw plates have therefore been not truly satisfactory.
SUMMARY OF T~E INVENTION
It is an object of this invention to improve the crushing per-formance of the jaw plates of the type disclosed in the aforementioned Japanese utility model application.
Another object of the invention is to increase the useful life of the jaw plates of the above specified type.
The invention is based upon the discovery that the best possible crushing performance and the longest possible service life can be derived from a jaw plate of the type u~der conside~ation only when the latter is manufactured to some pertinent dimensional specifications. Thus J in accordance with the invention, such pertinent dimensions of the jaw plate are specified in relation to the pitch of the corrugations of its crushing surface. The jaw plate of this invention has the distinct advantage that the ridges and furrows of its crushing surface are worn at approximately the same rate. This means that the desired diference in height between the ridges and furrows of the crushing surface is maintained for an ex-tended length of time, so that the performance of the jaw plate does not deterioratewith the progress of its wear.
According to the present invention, there is provided a jaw plate structure for use in the opposed, coacting jaws of a jaw crusher, compris-ing a base of relatively ductile material having a crushing surface which lV91207 is corrugated to p~ovido alt~rnating ridges and furrows at a preselected pitch, therc being a series of recesses of generally rectangular shape in the crushing surface of tho base disposed along each ridge thereon, each recess having a width and a length each ranging from about 0.2 to about 0.8 times the pitch of the crushing surface corrugations, each series of recesses having spacing gaps therebetween each ranging from about 0.05 to about 0.50 times the pitch of the crushing surface corrugations, a plurality of blocks made from more wear-resistant material than the base and fitted in respective recesses in the crushing surface of the base, each block having an exposed surface shaped to conform to the shape of each ridge of the crushing surface and having a portion projecting beyond both lateral edges of the base bound-ing the open end o each recess, the projecting portion of each block having a height ranging from about 0.3 to about 1.0 times the pitch of the crushing surface corrugations, and means for securing the blocks to the base.
The above and other objects, features and advantages of this in-vention and the manner of atta.ining them will become more readily apparent, and the invention itself will best be understood, from the following descrip-tion of preferred embodiments of the invention, which is to be read in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a side elevation, in vertical section, schematically illustrating an example of a jaw crusher having jaw plates which can be constructed in accordance with the present invention;
Fig. 2 is a perspective view of the jaw plate structure embodying the principles of the invention;
Fig. 3 is a relatively enlarged, fragmentary plan view of the jaw plate structure of Fig. 2;
Fig. 4 is a fragmentary sectional view of the jaw plate structure taken on the line IV-IV of Pig. 3; and Pig. 5 is a view similar to Fig. 4 but showing a modification of the embodiment of Figs. 2, 3 and 4.
Z()7 DETAILED DESCRIP~ION
Referring in detail to the above drawings and initially to Fig. 1 thereof, there is shown a jaw crusher of the overhead eccentric or single toggle type generally designated by reference numeral 10. The jaw crusher 10 comprises a stationary jaw 11 and a movable or "swinging" jaw 12 which are disposed opposite to each other to define therebetween the usual crush ing cavity having a feed inlet 13 at the top and a product outlet 14 at the bottom. The stationary jaw 11 has a jaw plate 15 which is shown to be com-posed of a plurality of separate sections and which is bolted or otherwise fastened to a framel6 in vertical disposition.
The movable jaw 12 has a jaw plate 17 which is likewise shown to be composed of a plurality of sections and which is bolted or otherwise fastened to a j~w support 18 disposed at its lower end near the lower end of the stationary jaw 11 and inclined away from the stationary jaw. At its top end, ~he movable jaw support 18 is rotatably coupled via a ball bearing 19 to an eccentric shaft 20 which in turn is coupled eccentrically to a flywheel 21 rotated by a suitable drive mechanism ~not shown~. Also in-cluded in the jaw crusher 10 are a toggle mechanism 22 having a toggle member 23 extending between, and fitted in the bottom end of the movable jaw support 18 and a frame 24, and a spring assembly 25 comprising a coiled compression spring 26 and a tension rod 27 for biasing the movable jaw 12 away from the stationary jaw 11.
Thus, as the flywheel 21 is rotated by the drive mechanism, the movable jaw 12 "swings" in a fashion peculiar to the jaw crusher and coacts with the stationary jaw 11 to crush rock, ores or other bulk material. This bulk material is fed into the machine through the feed inlet 13, and the crushed product is discharged out of the product outlet 14.
The construction and operation of the overhead eccentric jaw crusher 10 as so far described have been well known in the art, and therein lies no feature of this invention. The invention is specifically directed to the jaw plate structure, shown in FIG. 2 and therein generally labelled 30, that can be used as the stationary or the movable jaw plate 15 or 17 or lV5~12(~7 as onc of the Gonstituent sectiolls of eitller jaw plate.
With reference now directed to FIGS. 2, 3 and 4, the jaw plate structure 30 in accordance wîth this invention comprises a baso 31 and a plurality of multiplicity of substantially rectangular blocks 32 of wear-resistant material received in respective recesses 33 formed in the base.
Preferably cast from such comparatively ductile material as high manganese cast steel or low-alloy cast steel and heat-treated, the base 31 has a crushing surface 34 which is corrugated to form alternating curved ridges 35 and furrows 36. The recesses 33 of generally rectangular shape are formed in the crushing surface 34 of the base 31 so as to be disposed along the ridges 35 thereon.
Although the recesses 33 are shown to be aligned in both of the directions parallel and transverse to the corrugations 35 and 36 of the crushing surface 34, the recesses may be arranged in a staggered or zigzag fashion in the transverse direction. It is of absolute necessity, however, that the recesses 33 be aligned along each ridge 35 of the crushing surface 34.
The blocks 32 fitted into the recesses 33 should be made of more wear-resistant material than the base 31, such as, preferably, high chromium cast iron, which may be heat-treated as required. As will be best seen from FIG. 4, each block 32 has an exposed surface 37 which is curved to conform to the shape of each ridge 35 of the crushing surface 34, so that the ridges are formed by both the base and the blocks.
The base 31 and the blocks 32, if they are casting as aforesaid, are finished by grinding, and each block is fitted into one of the recesses 33 in the base with constant clearance C around the block. The blocks 32 are secured to the base 31, for example, by means of a suitable synthetic resin adhesive, indicated at 38 in FIG. 4, which is filled in the gaps there-between.
Shown at 39 FIGS. 3 and 4 are grooves o constant depth formed in the rear surface 40 of the base 31 in parallel spaced relationship to each other. These grooves are disposed substantially in register with the 10~2~7 furrows 36 of the crushi~g surface 34 and are intendod for use i~ mounting the jaw plate structure 30 in position on the crusher 10.
In accordance with this invention, some pertinent dimensions of the jaw plate structure 30 of the above described configuration are specified as follows in relation to the pitch P (FIG. 4) of the corrugations 35 and 36 of the crushing surface 34 in order to derive the best possible crushing performance and enduring ~uality thererom. The actual length of the pitch P
of the crushing surface corrugations is subject to change depending upon the size of the feed material and of the p~ocessed product. Roughly speaking, however, this pitch can be in the range of 200 through 250 millimeters for coarse crushing, of 90 through 200 millimeters for intermediate crushingJ
and of 40 through 90 millimeters for fine crushing.
The width W and the length L of each recess 33 in the base 31 each range from about 0.2 to about 0.8 times the pitch P. The spacing gap S between any two adjacent recesses 33 of each series ranges rom about 0.05 to about 0.50 times the pitch P. The height H of the portion 41 of each block 32 projecting beyond the opposite lateral edges ~2 of the base 31 bound-ing the open end of each recess 33 ranges rom about 0.3 to about 1.0 times the pitch P.
Furthermore, the depth D of each recess 33 ~as measured from the lateral edges 42 down to the bottom of the recess) preferably ranges from about 0.1 to about 0.8 times the pitch P. The thickness T of the portion 43 of the base 31 lying between the recesses 33 and the grooves 39 ranges from about 0.03 to about 0.50 times the pitch P. The clearance C with which each block 32 is fitted in one of the recesses 33 ranges from about 0.02 to about 0.10 times the pitch P. Although the dimensions of each block 32 are not specifically set forth except for the height H of its portion 41, the block dimensions can be easily computed from the above speciied dimensions of each recess 33 and clearance C.
The width W of each recess 33 is set in the range of from about 0~2 to about 0.8 times the pitch P because, at widths less than about 0.2 times the pitch P, the corresponding width of each block 32 would be so small that lt~91207 the furrow portions of the base 31 would suffer rapid wcar, resulting in the excessive prot~usion of the blocks 32 out of the crushing surface 34, es-pecially in the case of jaw plates designed for fine crushing. Such protrud-ing blocks would easily fracture, and the performance and durability of the jaw plates would be materially reduced. If the width W of each recess 33 were more than about 0.8 times the pitch P, on th~ othor hand, then the corresponding width of the furrow portions of the base 31 would be so reduced that the desired difference in height between the ridges 35 and furrows 36 of the crushing surface 34 would not be maintained for any extended length of time.
The length L of each recess 33 is also set in the range of from about 0.2 to about 0.8 times the pitch P. This is because, if the recess length L were less than about 0.2 times the pitch P, the corresponding length of each block 32 would be so small that an unnecessarily large number of such blocks would have to bc embedded in each ridge 35 of the crushing surface 34, thereby causing an increase in the manufacturing cost of the jaw plate.
Alternatively, such reduction in the length L of each recess 33 might result in a corresponding increase in the spacing gap S between the recesses of each series. In this case, the base portions lying between the recesses of each series would suffer rapid wear, again resulting in the excessive protrusion of the blocks 32 out of the c~ushing surface 34, and the worn base portions would form pockets in which the material would easily to be caught while being crushed. If the recess length L were more than about 0.8 times the pitch P, on the other hand, then the blocks 32 of correspondingly increased length would be vulnerable to fracture.
The spacing gap S between any two adjacent ones of the recesses 33 of each series is speciied as being in the range of from about 0.05 to about 0.50 times the pitch P. The reason for this is that, should the spacing gap S be less than about 0.05 times the pitch P, the molten metal would not flow smoothly in the mold during the casing of the jaw plate base 31, resulting in the production of defective articles. The spacing gap S of more than about 0.50 times the pitch P is also undesirable for the reasons set forth already in conjunction with the length L of each recess 33.
The height 11 of the projecting portion ~1 of each block 32 is set in ~he range of from about 0.3 to about 1.0 times the pitch P. If the height H were less than about 0.3 times the pitch P, there would not be a suffici-ent difference in height between the ridges 35 and furrows 36 of the crush-ing surface 34, resulting in poor crushing performance. If the height H
were more than about 1.0 times the pitch P, on the other hand, then there would be too great a difference in height between the ridges and furrows of the crushing surface to cause smooth flow of the material down ~he crushing cavity of the jaw crusher. The material might then be scattered about while being crushed, and the blocks 32 would be vulnerable to fracture or damage.
The depth D of each recess 33 is specified as ranging from about 0.1 to about 0.8 times the pitch P. If the depth D were less than about 0.1 times the pitch P, the blocks 32 fitted in the recesses 33 would be of such small thickness that they would be susceptible to fracture or damage and might even be thrown out of the recesses in use. If the depth D were more than about 0.8 times the pitch P, on the other hand, then unnecessarily large amounts of materials would have to be used for the manufacture of the base 31 and the blocks 32.
The thickness T of the base portion 43 between the recesses 33 and the grooves 39 is set in the range of from about 0.03 to about 0.50 times the pitch P. If the thickness T were less than about 0.03 times the pitch P, the base 31 would be difficult to manufacture by casting and might be fractured in use. If the thickness T were more than about 0.5 times the pitch P, on the other hand, then an unnecessarily large amount of material would be required for the manufacture of the base 31.
The clearance C with which each block 32 is fitted in the respect- ;
i~e recess 33 is set in the range of from about 0.02 to about 0.10 times the pitch P. If the clearance C were less than about 0.02 times the pitch P, the amount of ~n adhesive filled into the clear space would be insufficient to securely retain each block 32 in the recess 33. On the contrary, if the clearance C were more than about 0.1 times the pitch P, the amount of an _g lt~9~Z~7 adhesive filled into the clear space would bc too much to securely retain each block in the recess. In either case, therefore, the blocks might be dislodged out of the recesses in use.
Having thus set forth the grounds on which are based thc dimension-al specifications of the jaw plate structure 30 in accordance with this in-vention, it is clear that the jaw plate structure is well calculated to attain the above stated objectives. In order to demonstrate this fact, several different pairs of jaw plates were manufactured in accordance with the teachings of this invention and wore put to practical tests as to their crushing performance and durability. The test results were further compared against the results of similar tests conducted on prior art pairs of jaw plates.
For these tests, four sample pairs o jaw plates I, II, III and IV
were manufactured in accordance with ~he invention, with the respective sets of dimensions specified in the table below, I and II being intended for fine crushing and III and IV for coarse crushing. Also, two prior art pairs of jaw plates V ~for fine crushing) and VI ~for coarse crushing) were employed which were both cast solely from high manganese steel, with corrugations on their crushing surfaces similar to the corrugations on the jaw plates of this invention. The difference in height between the ridges and furrows of the crushing suraces was 25 millimeters in the prior art jaw plates V and 60 millimeters in the prior art jaw plates VI. Mounted on one and the same jaw crusher, the pairs of jaw plates of the invention and the prior art were used for ore crushing under the same working conditions to determine their per-hour capacities and wear ratios between the ridges and furrows of the crushing surfaces. The results are tabulated in the following table.
2(~7 _ ~
~d h ~ ~ ~ _~ ~ ~
h ~ ,, .. .. .. .. ..
Cd 3 ~: u~ ~ )
L20'7 of the corrugated crushing surface is more wear resistant than its furrows, so that the difference in height between thc ridges and furrows can be maintained for a greater period of time than with the jaw plates of homog-eneous material.
A problem has been encountercd, howevcr, in the dimensioning of the jaw plates according to the above mentioned Japanese utility model application. Since jaw crushers in general are required to handle materials of widely varying hardness and other properties, the dimensions of the jaw plates ~i.e., those of the bases and the blocks) have been determined on a purely empirical basis. The performance and durability of the jaw plates have therefore been not truly satisfactory.
SUMMARY OF T~E INVENTION
It is an object of this invention to improve the crushing per-formance of the jaw plates of the type disclosed in the aforementioned Japanese utility model application.
Another object of the invention is to increase the useful life of the jaw plates of the above specified type.
The invention is based upon the discovery that the best possible crushing performance and the longest possible service life can be derived from a jaw plate of the type u~der conside~ation only when the latter is manufactured to some pertinent dimensional specifications. Thus J in accordance with the invention, such pertinent dimensions of the jaw plate are specified in relation to the pitch of the corrugations of its crushing surface. The jaw plate of this invention has the distinct advantage that the ridges and furrows of its crushing surface are worn at approximately the same rate. This means that the desired diference in height between the ridges and furrows of the crushing surface is maintained for an ex-tended length of time, so that the performance of the jaw plate does not deterioratewith the progress of its wear.
According to the present invention, there is provided a jaw plate structure for use in the opposed, coacting jaws of a jaw crusher, compris-ing a base of relatively ductile material having a crushing surface which lV91207 is corrugated to p~ovido alt~rnating ridges and furrows at a preselected pitch, therc being a series of recesses of generally rectangular shape in the crushing surface of tho base disposed along each ridge thereon, each recess having a width and a length each ranging from about 0.2 to about 0.8 times the pitch of the crushing surface corrugations, each series of recesses having spacing gaps therebetween each ranging from about 0.05 to about 0.50 times the pitch of the crushing surface corrugations, a plurality of blocks made from more wear-resistant material than the base and fitted in respective recesses in the crushing surface of the base, each block having an exposed surface shaped to conform to the shape of each ridge of the crushing surface and having a portion projecting beyond both lateral edges of the base bound-ing the open end o each recess, the projecting portion of each block having a height ranging from about 0.3 to about 1.0 times the pitch of the crushing surface corrugations, and means for securing the blocks to the base.
The above and other objects, features and advantages of this in-vention and the manner of atta.ining them will become more readily apparent, and the invention itself will best be understood, from the following descrip-tion of preferred embodiments of the invention, which is to be read in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a side elevation, in vertical section, schematically illustrating an example of a jaw crusher having jaw plates which can be constructed in accordance with the present invention;
Fig. 2 is a perspective view of the jaw plate structure embodying the principles of the invention;
Fig. 3 is a relatively enlarged, fragmentary plan view of the jaw plate structure of Fig. 2;
Fig. 4 is a fragmentary sectional view of the jaw plate structure taken on the line IV-IV of Pig. 3; and Pig. 5 is a view similar to Fig. 4 but showing a modification of the embodiment of Figs. 2, 3 and 4.
Z()7 DETAILED DESCRIP~ION
Referring in detail to the above drawings and initially to Fig. 1 thereof, there is shown a jaw crusher of the overhead eccentric or single toggle type generally designated by reference numeral 10. The jaw crusher 10 comprises a stationary jaw 11 and a movable or "swinging" jaw 12 which are disposed opposite to each other to define therebetween the usual crush ing cavity having a feed inlet 13 at the top and a product outlet 14 at the bottom. The stationary jaw 11 has a jaw plate 15 which is shown to be com-posed of a plurality of separate sections and which is bolted or otherwise fastened to a framel6 in vertical disposition.
The movable jaw 12 has a jaw plate 17 which is likewise shown to be composed of a plurality of sections and which is bolted or otherwise fastened to a j~w support 18 disposed at its lower end near the lower end of the stationary jaw 11 and inclined away from the stationary jaw. At its top end, ~he movable jaw support 18 is rotatably coupled via a ball bearing 19 to an eccentric shaft 20 which in turn is coupled eccentrically to a flywheel 21 rotated by a suitable drive mechanism ~not shown~. Also in-cluded in the jaw crusher 10 are a toggle mechanism 22 having a toggle member 23 extending between, and fitted in the bottom end of the movable jaw support 18 and a frame 24, and a spring assembly 25 comprising a coiled compression spring 26 and a tension rod 27 for biasing the movable jaw 12 away from the stationary jaw 11.
Thus, as the flywheel 21 is rotated by the drive mechanism, the movable jaw 12 "swings" in a fashion peculiar to the jaw crusher and coacts with the stationary jaw 11 to crush rock, ores or other bulk material. This bulk material is fed into the machine through the feed inlet 13, and the crushed product is discharged out of the product outlet 14.
The construction and operation of the overhead eccentric jaw crusher 10 as so far described have been well known in the art, and therein lies no feature of this invention. The invention is specifically directed to the jaw plate structure, shown in FIG. 2 and therein generally labelled 30, that can be used as the stationary or the movable jaw plate 15 or 17 or lV5~12(~7 as onc of the Gonstituent sectiolls of eitller jaw plate.
With reference now directed to FIGS. 2, 3 and 4, the jaw plate structure 30 in accordance wîth this invention comprises a baso 31 and a plurality of multiplicity of substantially rectangular blocks 32 of wear-resistant material received in respective recesses 33 formed in the base.
Preferably cast from such comparatively ductile material as high manganese cast steel or low-alloy cast steel and heat-treated, the base 31 has a crushing surface 34 which is corrugated to form alternating curved ridges 35 and furrows 36. The recesses 33 of generally rectangular shape are formed in the crushing surface 34 of the base 31 so as to be disposed along the ridges 35 thereon.
Although the recesses 33 are shown to be aligned in both of the directions parallel and transverse to the corrugations 35 and 36 of the crushing surface 34, the recesses may be arranged in a staggered or zigzag fashion in the transverse direction. It is of absolute necessity, however, that the recesses 33 be aligned along each ridge 35 of the crushing surface 34.
The blocks 32 fitted into the recesses 33 should be made of more wear-resistant material than the base 31, such as, preferably, high chromium cast iron, which may be heat-treated as required. As will be best seen from FIG. 4, each block 32 has an exposed surface 37 which is curved to conform to the shape of each ridge 35 of the crushing surface 34, so that the ridges are formed by both the base and the blocks.
The base 31 and the blocks 32, if they are casting as aforesaid, are finished by grinding, and each block is fitted into one of the recesses 33 in the base with constant clearance C around the block. The blocks 32 are secured to the base 31, for example, by means of a suitable synthetic resin adhesive, indicated at 38 in FIG. 4, which is filled in the gaps there-between.
Shown at 39 FIGS. 3 and 4 are grooves o constant depth formed in the rear surface 40 of the base 31 in parallel spaced relationship to each other. These grooves are disposed substantially in register with the 10~2~7 furrows 36 of the crushi~g surface 34 and are intendod for use i~ mounting the jaw plate structure 30 in position on the crusher 10.
In accordance with this invention, some pertinent dimensions of the jaw plate structure 30 of the above described configuration are specified as follows in relation to the pitch P (FIG. 4) of the corrugations 35 and 36 of the crushing surface 34 in order to derive the best possible crushing performance and enduring ~uality thererom. The actual length of the pitch P
of the crushing surface corrugations is subject to change depending upon the size of the feed material and of the p~ocessed product. Roughly speaking, however, this pitch can be in the range of 200 through 250 millimeters for coarse crushing, of 90 through 200 millimeters for intermediate crushingJ
and of 40 through 90 millimeters for fine crushing.
The width W and the length L of each recess 33 in the base 31 each range from about 0.2 to about 0.8 times the pitch P. The spacing gap S between any two adjacent recesses 33 of each series ranges rom about 0.05 to about 0.50 times the pitch P. The height H of the portion 41 of each block 32 projecting beyond the opposite lateral edges ~2 of the base 31 bound-ing the open end of each recess 33 ranges rom about 0.3 to about 1.0 times the pitch P.
Furthermore, the depth D of each recess 33 ~as measured from the lateral edges 42 down to the bottom of the recess) preferably ranges from about 0.1 to about 0.8 times the pitch P. The thickness T of the portion 43 of the base 31 lying between the recesses 33 and the grooves 39 ranges from about 0.03 to about 0.50 times the pitch P. The clearance C with which each block 32 is fitted in one of the recesses 33 ranges from about 0.02 to about 0.10 times the pitch P. Although the dimensions of each block 32 are not specifically set forth except for the height H of its portion 41, the block dimensions can be easily computed from the above speciied dimensions of each recess 33 and clearance C.
The width W of each recess 33 is set in the range of from about 0~2 to about 0.8 times the pitch P because, at widths less than about 0.2 times the pitch P, the corresponding width of each block 32 would be so small that lt~91207 the furrow portions of the base 31 would suffer rapid wcar, resulting in the excessive prot~usion of the blocks 32 out of the crushing surface 34, es-pecially in the case of jaw plates designed for fine crushing. Such protrud-ing blocks would easily fracture, and the performance and durability of the jaw plates would be materially reduced. If the width W of each recess 33 were more than about 0.8 times the pitch P, on th~ othor hand, then the corresponding width of the furrow portions of the base 31 would be so reduced that the desired difference in height between the ridges 35 and furrows 36 of the crushing surface 34 would not be maintained for any extended length of time.
The length L of each recess 33 is also set in the range of from about 0.2 to about 0.8 times the pitch P. This is because, if the recess length L were less than about 0.2 times the pitch P, the corresponding length of each block 32 would be so small that an unnecessarily large number of such blocks would have to bc embedded in each ridge 35 of the crushing surface 34, thereby causing an increase in the manufacturing cost of the jaw plate.
Alternatively, such reduction in the length L of each recess 33 might result in a corresponding increase in the spacing gap S between the recesses of each series. In this case, the base portions lying between the recesses of each series would suffer rapid wear, again resulting in the excessive protrusion of the blocks 32 out of the c~ushing surface 34, and the worn base portions would form pockets in which the material would easily to be caught while being crushed. If the recess length L were more than about 0.8 times the pitch P, on the other hand, then the blocks 32 of correspondingly increased length would be vulnerable to fracture.
The spacing gap S between any two adjacent ones of the recesses 33 of each series is speciied as being in the range of from about 0.05 to about 0.50 times the pitch P. The reason for this is that, should the spacing gap S be less than about 0.05 times the pitch P, the molten metal would not flow smoothly in the mold during the casing of the jaw plate base 31, resulting in the production of defective articles. The spacing gap S of more than about 0.50 times the pitch P is also undesirable for the reasons set forth already in conjunction with the length L of each recess 33.
The height 11 of the projecting portion ~1 of each block 32 is set in ~he range of from about 0.3 to about 1.0 times the pitch P. If the height H were less than about 0.3 times the pitch P, there would not be a suffici-ent difference in height between the ridges 35 and furrows 36 of the crush-ing surface 34, resulting in poor crushing performance. If the height H
were more than about 1.0 times the pitch P, on the other hand, then there would be too great a difference in height between the ridges and furrows of the crushing surface to cause smooth flow of the material down ~he crushing cavity of the jaw crusher. The material might then be scattered about while being crushed, and the blocks 32 would be vulnerable to fracture or damage.
The depth D of each recess 33 is specified as ranging from about 0.1 to about 0.8 times the pitch P. If the depth D were less than about 0.1 times the pitch P, the blocks 32 fitted in the recesses 33 would be of such small thickness that they would be susceptible to fracture or damage and might even be thrown out of the recesses in use. If the depth D were more than about 0.8 times the pitch P, on the other hand, then unnecessarily large amounts of materials would have to be used for the manufacture of the base 31 and the blocks 32.
The thickness T of the base portion 43 between the recesses 33 and the grooves 39 is set in the range of from about 0.03 to about 0.50 times the pitch P. If the thickness T were less than about 0.03 times the pitch P, the base 31 would be difficult to manufacture by casting and might be fractured in use. If the thickness T were more than about 0.5 times the pitch P, on the other hand, then an unnecessarily large amount of material would be required for the manufacture of the base 31.
The clearance C with which each block 32 is fitted in the respect- ;
i~e recess 33 is set in the range of from about 0.02 to about 0.10 times the pitch P. If the clearance C were less than about 0.02 times the pitch P, the amount of ~n adhesive filled into the clear space would be insufficient to securely retain each block 32 in the recess 33. On the contrary, if the clearance C were more than about 0.1 times the pitch P, the amount of an _g lt~9~Z~7 adhesive filled into the clear space would bc too much to securely retain each block in the recess. In either case, therefore, the blocks might be dislodged out of the recesses in use.
Having thus set forth the grounds on which are based thc dimension-al specifications of the jaw plate structure 30 in accordance with this in-vention, it is clear that the jaw plate structure is well calculated to attain the above stated objectives. In order to demonstrate this fact, several different pairs of jaw plates were manufactured in accordance with the teachings of this invention and wore put to practical tests as to their crushing performance and durability. The test results were further compared against the results of similar tests conducted on prior art pairs of jaw plates.
For these tests, four sample pairs o jaw plates I, II, III and IV
were manufactured in accordance with ~he invention, with the respective sets of dimensions specified in the table below, I and II being intended for fine crushing and III and IV for coarse crushing. Also, two prior art pairs of jaw plates V ~for fine crushing) and VI ~for coarse crushing) were employed which were both cast solely from high manganese steel, with corrugations on their crushing surfaces similar to the corrugations on the jaw plates of this invention. The difference in height between the ridges and furrows of the crushing suraces was 25 millimeters in the prior art jaw plates V and 60 millimeters in the prior art jaw plates VI. Mounted on one and the same jaw crusher, the pairs of jaw plates of the invention and the prior art were used for ore crushing under the same working conditions to determine their per-hour capacities and wear ratios between the ridges and furrows of the crushing surfaces. The results are tabulated in the following table.
2(~7 _ ~
~d h ~ ~ ~ _~ ~ ~
h ~ ,, .. .. .. .. ..
Cd 3 ~: u~ ~ )
3 ~i _ :5 U~ o o Oo ~ O ~ ~ ~ U~ U~ ~ O
h ~ Il~ ~C) Ll~ ~:
h~, _ ~ o : : : ~ ' O U~ O o . .
3 ~ ~ O) N
. ~ .. .
~ 00 0 o~ O . .
~ ~ _I N t~ ~ .
.~ .. ., .
U~ O L~ N N . ~:
.~ . `' ''' O 0 00 ~ . .
~-1 ~ ~ ~0 ~C) _ . .
N t~ O O . .
3 N ~) O N
_ O O O O O O
~ t'~ Lt~ ~ N ~ 00 l _ _
h ~ Il~ ~C) Ll~ ~:
h~, _ ~ o : : : ~ ' O U~ O o . .
3 ~ ~ O) N
. ~ .. .
~ 00 0 o~ O . .
~ ~ _I N t~ ~ .
.~ .. ., .
U~ O L~ N N . ~:
.~ . `' ''' O 0 00 ~ . .
~-1 ~ ~ ~0 ~C) _ . .
N t~ O O . .
3 N ~) O N
_ O O O O O O
~ t'~ Lt~ ~ N ~ 00 l _ _
4 bl~ b~
a~
h .S7-1 .S
~> u :~ h ~ h~) ~ U. ~ O
__ ....................................... _ . .,~
~ ~ ~ ~ S~ ~
,, _ ()7 It will be readily seen from the above table that the jaw plates constructed in accordance with this invention serve to materially increase the capacity of jaw crushers. Moreover, th0 ridges and furrows of the in-ventive jaw plates are worn at a substantially even ratio; indeed, in the inventive jaw plates designed for coarse crushing, hardly any difference exists in the rates of wear of the ridges and furrows. This is in marked contrast to the extremely uneven wear of the ridges and urrows of the prior art jaw plates. It is therefore apparent that the useful life of the in-ventive jaw plates is significantly longer than that of the prior art.
In FIG. 5 is shown a slight modification of the above described jaw plate structure 30, in which modification each block 32a of wear-resistant material has a plurality of grooves 45 formed in its lateral surfaces in parallel spaced relationship to each other and in parallel relationship to the plane of the jaw plate structure. These grooves are intended to receive the synthetic resin adhesive 38 as the latter is filled into the gaps be-tween each block 32a and the surrounding recess walls of the base 31. In this manner the blocks 32a will be retained in the respective recesses 33 still more positively than the blocks 32 having no such grooves. It is to be understood, however, that the illustrated grooves 45 are by way of ex-ample only and can be replaced by other depressions of any desired shape or arrangement.
a~
h .S7-1 .S
~> u :~ h ~ h~) ~ U. ~ O
__ ....................................... _ . .,~
~ ~ ~ ~ S~ ~
,, _ ()7 It will be readily seen from the above table that the jaw plates constructed in accordance with this invention serve to materially increase the capacity of jaw crushers. Moreover, th0 ridges and furrows of the in-ventive jaw plates are worn at a substantially even ratio; indeed, in the inventive jaw plates designed for coarse crushing, hardly any difference exists in the rates of wear of the ridges and furrows. This is in marked contrast to the extremely uneven wear of the ridges and urrows of the prior art jaw plates. It is therefore apparent that the useful life of the in-ventive jaw plates is significantly longer than that of the prior art.
In FIG. 5 is shown a slight modification of the above described jaw plate structure 30, in which modification each block 32a of wear-resistant material has a plurality of grooves 45 formed in its lateral surfaces in parallel spaced relationship to each other and in parallel relationship to the plane of the jaw plate structure. These grooves are intended to receive the synthetic resin adhesive 38 as the latter is filled into the gaps be-tween each block 32a and the surrounding recess walls of the base 31. In this manner the blocks 32a will be retained in the respective recesses 33 still more positively than the blocks 32 having no such grooves. It is to be understood, however, that the illustrated grooves 45 are by way of ex-ample only and can be replaced by other depressions of any desired shape or arrangement.
Claims (8)
1. A jaw plate structure for use in the opposed, coacting jaws of a jaw crusher, comprising in combina-tion, a base of relatively ductile material having a crushing surface which is corrugated to provide alter-nating ridges and furrows with a preselected pitch (P), there being a series of recesses of generally rectan-gular shape in the crushing surface of the base disposed along each ridge thereon, each recess having a width (W) and a length (L) each ranging from about 0.2 to about 0.8 times the pitch (P), each series of recesses having spacing gaps (S) therebetween each ranging from about 0.05 to about 0.50 times the pitch (P), a plurality of blocks made from more wear-resistant materi-al than the base and fitted in respective recesses in the crushing surface of the base, each block having an ex-posed surface shaped to conform to the shape of each ridge of the crushing surface and having a portion pro-jecting beyond both lateral edges of the base bounding the open end of each recess, the projecting portion of each block having a height (H) ranging from about 0.3 to about 1.0 times the pitch (P), and means for securing the blocks to the base.
2. The jaw plate structure as recited in claim 1, wherein each recess in the crushing surface of the base has a depth (D) ranging from about 0.1 to about 0.8 times the pitch (P).
3. The jaw plate structure as recited in claim 1, wherein the base has a plurality of grooves of constant depth formed in its surface opposite to the crushing surface, and wherein the portion of the base lying bet-ween the recesses and the grooves has a thickness (T) ranging from about 0.03 to about 0.50 times the pitch (P).
4. The jaw plate structure as recited in claim 1, wherein each block is received with clearance (C) in a respective one of the recesses in the crushing surface of the base, and wherein the securing means comprises an adhesive filled into the clearance.
5. The jaw plate structure as recited in claim 4, wherein the clearance (C) ranges from about 0.02 to about 0.50 times the pitch (P).
6. The jaw plate structure as recited in claim 4, wherein each block depressions formed in its lateral surfaces for receiving the adhesive.
7. The jaw plate structure as recited in claim 1, wherein the base is a casting of material selected from the group consisting of high manganese cast steel and low-alloy steels.
8. The jaw plate structure as recited in claim 1, wherein each block is a casting of high chromium iron.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP83,904/1977 | 1977-07-13 | ||
| JP8390477A JPS5419256A (en) | 1977-07-13 | 1977-07-13 | Method of producing tooth for jaw crushers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1091207A true CA1091207A (en) | 1980-12-09 |
Family
ID=13815604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA292,952A Expired CA1091207A (en) | 1977-07-13 | 1977-12-13 | Jaw plate structure for jaw crushers |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS5419256A (en) |
| AU (1) | AU509363B2 (en) |
| BR (1) | BR7708276A (en) |
| CA (1) | CA1091207A (en) |
| DE (1) | DE2755426C2 (en) |
| FR (1) | FR2397232A1 (en) |
| GB (1) | GB1588249A (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT392740B (en) * | 1985-12-03 | 1991-05-27 | Schroedl Hermann | BOW BAR FOR IMPACT CRUSHERS OD. DGL. CRUSHING MACHINES |
| US5328776A (en) * | 1993-01-04 | 1994-07-12 | Michail Garber | Abrasion and impact resistant composite castings and wear resistant surface provided therewith |
| AUPM559994A0 (en) * | 1994-05-12 | 1994-06-02 | Clyde Industries Limited Trading As Jacques | Jaw crushers |
| AU681027B2 (en) * | 1994-05-12 | 1997-08-14 | Clyde Industries Limited Trading As Jacques | Jaw crushers |
| EP2335827A1 (en) * | 2009-12-18 | 2011-06-22 | Metso Minerals, Inc. | Insert arrangement, wear surface structure for a jaw of a jaw crusher, jaw crusher and use of wear surface structure |
| CN105381835B (en) * | 2015-12-19 | 2018-02-27 | 南通知航机电科技有限公司 | A kind of powdery paints pulverizer disintegrating mechanism |
| CN105363545B (en) * | 2015-12-19 | 2018-09-21 | 嘉兴日雅光电有限公司 | A kind of powdery paints pulverizer |
| CN106732892A (en) * | 2016-12-13 | 2017-05-31 | 浙江武精机器制造有限公司 | Potassium steel inlays rich chromium cast iron jaw and its manufacture method |
| DE102017212922B4 (en) * | 2017-07-27 | 2023-06-29 | Thyssenkrupp Ag | Crusher with a wear element and a method for manufacturing a wear element of a crusher |
| CN110280351A (en) * | 2017-11-06 | 2019-09-27 | 张家界航空工业职业技术学院 | A kind of wear-resistant liner |
| CN111729714A (en) * | 2020-07-06 | 2020-10-02 | 上海应用技术大学 | Jaw crusher with straight-curve mixed crushing cavity |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE321009C (en) * | 1917-10-25 | 1920-05-08 | Poul Bechgaard | Crushing jaw for stone crusher u. like |
| FR1075555A (en) * | 1953-03-09 | 1954-10-18 | Garnier & Cie G | Internal lining shield plate for ball mills or other grinding bodies |
| FR1352683A (en) * | 1963-04-09 | 1964-02-14 | Esco Corp | Packing plate for mulcher jaws |
| US3241777A (en) * | 1965-04-08 | 1966-03-22 | Hanna Mining Co | Crusher jaw construction |
| JPS5631322Y2 (en) * | 1971-09-30 | 1981-07-25 | ||
| FR2297673A1 (en) * | 1975-01-15 | 1976-08-13 | Pt Institu | Wear resistant parts for crushing machinery - using steel castings contg. white martensitic cast iron inserts for long life |
-
1977
- 1977-07-13 JP JP8390477A patent/JPS5419256A/en active Granted
- 1977-12-08 AU AU31383/77A patent/AU509363B2/en not_active Expired
- 1977-12-13 BR BR7708276A patent/BR7708276A/en unknown
- 1977-12-13 FR FR7737506A patent/FR2397232A1/en active Granted
- 1977-12-13 CA CA292,952A patent/CA1091207A/en not_active Expired
- 1977-12-13 DE DE19772755426 patent/DE2755426C2/en not_active Expired
- 1977-12-14 GB GB5192177A patent/GB1588249A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2397232B1 (en) | 1983-05-20 |
| DE2755426A1 (en) | 1979-01-25 |
| AU3138377A (en) | 1979-06-14 |
| FR2397232A1 (en) | 1979-02-09 |
| JPS5723542B2 (en) | 1982-05-19 |
| GB1588249A (en) | 1981-04-23 |
| DE2755426C2 (en) | 1986-11-06 |
| AU509363B2 (en) | 1980-05-08 |
| BR7708276A (en) | 1979-07-03 |
| JPS5419256A (en) | 1979-02-13 |
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| Date | Code | Title | Description |
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| MKEX | Expiry |