CN210646696U - Double-shaft scrap steel shredder - Google Patents

Abstract

The utility model discloses a double-shaft scrap steel shredder, which comprises a driving device, a speed reducer, a box body, a left roller shaft, a right roller shaft, a plurality of cutter assemblies and a synchronous mechanism, wherein each cutter assembly comprises a cutter head and a spacer sleeve; the left roller shaft and the right roller shaft are arranged in the box body, and the driving device drives the left roller shaft and the right roller shaft to rotate oppositely through the torque limiter and the speed reducer. Cutter disc and spacer are the components of a whole that can function independently sword of combination formula, and the hole of cutter disc and spacer is provided with the axial boss, and circumference is provided with the axial recess on left roller axle and the right roller axle, and the cooperation through boss and recess makes but cutter disc and spacer interval are installed on left roller axle and right roller axle, and the epaxial spacer of left roller corresponds the setting with the epaxial cutter disc of right roller, and cutter disc and spacer circumference all are provided with the tooth, and the cutter disc that corresponds mutually on left roller axle and the right roller axle also corresponds each other at the shearing position with the prong of spacer to participate in jointly shearing and tearing the material, compare with the extrusion mode of traditional scrap steel shredder, cut the material more easily.

Description

Double-shaft scrap steel shredder

Technical Field

The utility model relates to a material processing equipment field, especially a biax scrap steel shredder.

Background

At present, the common shredder used in the scrap steel industry at home and abroad shreds scrap steel or scrap steel bars, so that the material type specification meets the steel-making requirement, and the existing shredder on the market has the following three problems:

1) the shredder is generally driven by a motor, a belt transmission and a speed reducer, and is driven by a low-speed large-torque motor and a large-torque speed reducer at higher power. The arrangement is not compact due to the transmission mode of the motor, the belt transmission and the speed reducer, the gear box bears the radial force of the belt, the low-speed large-torque motor is monopolized abroad, the price is high, and the purchase period is long.

2) The cutter of the shredder belongs to a wearing part and needs to be replaced frequently, the existing shredder generally adopts an integral cutter, the replacement is time-consuming and labor-consuming, and the use of a client is influenced; although a small number of manufacturers adopt split type cutters, the split type cutters are generally installed in a radial mode and are fixed through positioning blocks and bolts, the positioning blocks are difficult to disassemble, and the risk of bolt breakage is high.

3) The side edges of a cutter head on a left roller shaft and a right roller shaft of the existing double-shaft shredder shear horizontally entering materials; however, for materials entering vertically, the cutter head and the spacer bush opposite to the cutter head extrude the materials in an extrusion mode, the energy consumption is high during extrusion, and the situation of continuous extrusion often occurs.

SUMMERY OF THE UTILITY MODEL

In order to fill the blank of prior art, the utility model provides a biax scrap steel shredder.

A double-shaft scrap steel shredder comprises a driving device, a speed reducer, a box body, a left roller shaft, a right roller shaft, a plurality of cutter assemblies and a synchronous mechanism, wherein each cutter assembly comprises a cutter head and a spacer bush; the left roller shaft and the right roller shaft are arranged in the box body, cutter discs and spacer bushes which are arranged at intervals are respectively arranged on the left roller shaft and the right roller shaft, the spacer bushes on the left roller shaft are arranged corresponding to the cutter discs on the right roller shaft, and the cutter discs on the left roller shaft are arranged corresponding to the spacer bushes on the right roller shaft; the driving device drives the left roller shaft and the right roller shaft to rotate through the torque limiter and the speed reducer, and the synchronizing mechanism is connected with the left roller shaft and the right roller shaft respectively.

As the improvement of the scheme, the left roller shaft and the right roller shaft are arranged in parallel, and the left roller shaft and the right roller shaft rotate oppositely; grooves for installing the cutter head and the spacer bush are formed in the left roller shaft and the right roller shaft.

As the improvement of above-mentioned scheme, be provided with respectively on blade disc and the spacer with the recess complex boss of left roller axle or right roller axle, blade disc and spacer pass through the boss cooperation the recess cover is established and is installed on left roller axle and right roller axle, blade disc or spacer pass through locking device axial fixity at the both ends of left roller axle and right roller axle.

As an improvement of the scheme, the grooves are dovetail grooves or T-shaped grooves, and the bosses are correspondingly dovetail bosses or T-shaped bosses.

As an improvement of the scheme, the spacer bush and the cutter head are composed of at least two parts of bodies, the direction of inclination of the spacer bush on the left roll shaft and the direction of inclination of the helical teeth of the cutter head around the shaft are opposite, and the direction of inclination of the spacer bush on the right roll shaft and the direction of inclination of the helical teeth of the cutter head around the shaft are opposite.

In an improvement of the above scheme, on the axial projection plane of the left roller shaft and the right roller shaft, a connecting line between the helical tooth end of the cutter head on the left roller shaft and the helical tooth end of the corresponding spacer bush on the right roller shaft when the helical tooth end is at the closest point or the farthest point passes through the central line of the left roller shaft or the right roller shaft.

As an improvement of the scheme, on the axial projection surfaces of the left roller shaft and the right roller shaft, the helical tooth end parts of adjacent cutter heads on the left roller shaft or the right roller shaft are arranged in a staggered mode, and the helical tooth end parts of adjacent spacer bushes on the left roller shaft or the right roller shaft are arranged in a staggered mode.

As a modification of the above, the synchronizing mechanism includes a synchronizing gear 1 and a synchronizing gear 2, and the synchronizing gear 1 and the synchronizing gear 2 are respectively mounted on the left roller shaft and the right roller shaft and are engaged with each other.

As an improvement of the scheme, the distance between the end surfaces of the cutter assemblies arranged on the left roller shaft and the right roller shaft and the inner wall of the box body is larger than the width of a single cutter disc or a spacer.

The utility model has the advantages that: the utility model discloses a motor adds torque limiter and speed reducer drive left roller axle and right roller axle and rotates, arranges the compactness, and the overload protection response time of speed reducer and motor is fast, and the moment of torsion is big, and is with low costs and the cycle is short. Cutter head and spacer all adopt split type structure to through the axial mounting mode, directly install on left roller axle and right roller axle with dovetail or the cooperation of T-slot that left roller axle and right roller axle axial set up, the integrated configuration of cutter head and spacer compares in traditional cutter head and spacer monolithic structure, and the dismouting is more convenient and the structure atress is good. Blade disc and spacer circumference all are provided with the tooth, the blade disc is installed on left roller and right roller with the spacer interval, the epaxial blade disc of left roller and spacer correspond the setting with epaxial spacer and blade disc of right roller, and under synchro mechanism's effect, the blade disc that corresponds mutually on left roller and the right roller also corresponds mutually with the prong of spacer when shearing the position, the blade disc that corresponds participates in shearing and tearing the material jointly with the prong of spacer, compare with the extrusion mode of traditional scrap steel shredder, cut the material more easily.

Drawings

The present invention will be further explained with reference to the drawings and examples.

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a cross-sectional view of the present invention;

FIG. 3 is a schematic view showing the position of the cutter head or spacer of the left roller shaft corresponding to the spacer or cutter head of the right roller shaft;

FIG. 4 is a sectional view of the cutter head or spacer of the left roller shaft and the spacer or cutter head of the right roller shaft in the corresponding position;

FIG. 5 is a sectional view of the cutter head or spacer of the left roller shaft and the spacer or cutter head of the right roller shaft in the corresponding position;

FIG. 6 is a schematic view of the structure of the left roller shaft or the right roller shaft of the present invention;

FIG. 7 is a cross-sectional view of the cutter head and the spacer bush sleeved on the left roller shaft or the right roller shaft of the present invention;

fig. 8 is a cross-sectional view of the utility model after the cutter head and the spacer sleeve are arranged on the left roller shaft or the right roller shaft sleeve.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail with reference to examples.

The utility model relates to a biax scrap steel shredder, it is further detailed to describe below the preferred embodiment of the utility model. It should be noted that, in the present invention, the position of the left roller shaft 40 is defined as "left", and the position of the right roller shaft 50 is defined as "right"; the position of the driving device 10 for driving the left roller shaft 40 to rotate is defined as "front", and the position of the driving device 10 for driving the right roller shaft 50 to rotate is defined as "rear". For convenience of description, in the present invention, the end of the oblique teeth of the spacer 62 and the cutter head 61 is defined as a tooth point, i.e., the end of the oblique teeth at the end where the oblique teeth shred the material is defined as a tooth point.

As shown in fig. 1 to 4, a double-shaft scrap shredder comprises a driving device 10, a speed reducer 20, a box body 30, a left roller shaft 40, a right roller shaft 50, a plurality of cutter assemblies 60 and a synchronous mechanism, wherein each cutter assembly 60 comprises a cutter disc 61 and a spacer 62; left side roller 40 and right roller 50 are installed in box 30, install interval arrangement's blade disc 61 and spacer 62 on left side roller 40 and the right roller 50 respectively, the last spacer 62 of left side roller 40 corresponds the setting with the blade disc 61 on the right roller 50, and blade disc 61 on the left side roller 40 corresponds the setting with the spacer 62 on the right roller 50, and it is mutual corresponding to correspond to set up promptly, thereby makes spacer 62 with blade disc 61 and spacer 62 that the position corresponds each other can mutually support when the synchronous opposite direction of left roller 40 and right roller 50 and cut the material jointly. The driving device 10 drives the left roller shaft 40 and the right roller shaft 50 to rotate through the torque limiter 70 and the speed reducer 20, the arrangement is compact, the overload protection response time of the driving device 10 and the speed reducer 20 is fast, equipment can be better protected, the service life of the equipment is prolonged, the torque is large, and the cost is low; synchronous mechanism connects respectively left roller axle 40 with right roller axle 50, synchronous mechanism is used for guaranteeing that left roller axle 40 and right roller axle 50 rotate in step to it is in corresponding state all the time at the shearing position in the synchronous counter rotation of left roller axle 40 and right roller axle 50 to guarantee to correspond cutter head 61 and the spacer 62 that sets up, shears the material jointly, and the shearing position is the most recent position of the prong distance of the last cutter head 61 of left roller axle 40 or spacer 62 and the right roller axle 50 rather than corresponding on cutter head 62 or cutter head 61 of left roller axle 40.

Preferably, the left roller shaft 40 and the right roller shaft 50 are arranged in parallel, and the left roller shaft 40 and the right roller shaft 50 rotate oppositely to realize the shearing and tearing of the material by the correspondingly arranged cutter disc 61 and the spacer 62, so that the material is crushed; install blade disc 61 and spacer 62 part circumference on left side roller 40 and the right roller 50 and offer the axial recess 80 that the array is used for installing blade disc 61 and spacer 62, be provided with the array on the hole of blade disc 61 and spacer 62 with left side roller 40 or right roller 50's recess 80 complex boss 90, blade disc 61 and spacer 62 cooperate through the boss 90 that sets up on its hole the recess 80 cover that sets up on left side roller 40 or the right roller 50 is located on left side roller 40 and the right roller 50, through boss 90 with the moment of torsion is born in recess 80's cooperation, has avoided the locating piece and the bolt of current split type blade disc 61 and spacer 62, and it is more convenient to install. Blade disc 61 or spacer 62 pass through locking device 100 axial fixity at the both ends of left roller axle 40 and right roller axle 50 on left side roller axle 40 and the right roller axle 50, locking device 100 includes lock nut, the lock nut cover is located the both ends of left side roller axle 40 and right roller axle 50 are right blade disc 61 and spacer 62 carry out axial fixity.

As shown in fig. 5 to 8, the shape of the groove 80 on the left roller shaft 40 or the right roller shaft 50 is a dovetail groove or a T-shaped groove, the boss 90 arranged on the inner holes of the cutter head 61 and the spacer 62 corresponds to the shape of the groove 80 is set to be a dovetail boss 90 or a T-shaped boss 90 which can be sleeved in the dovetail groove or the T-shaped groove, so as to ensure that the cutter head 61 and the spacer 62 are smoothly sleeved on the left roller shaft 40 and the right roller shaft 50, the groove 80 is set to be a dovetail groove or a T-shaped groove, the cutter head 61 and the spacer 62 are sleeved on the left roller shaft 40 and the right roller shaft 50 by matching the dovetail boss 90 or the T-shaped boss 90, compared with the prior art that the cutter head 61 and the spacer 62 are fixed on the left roller shaft 40 and the right roller shaft 50 through a positioning block and a bolt, the cutter head is stronger in stability and good in structural stress, the positioning block and the bolt of the prior art, and is convenient to disassemble and assemble.

As preferred, spacer 62 and blade disc 61 comprise at least two parts body to constitute split type blade disc 61 or spacer 62, so that blade disc 61 or spacer 62's tooth when taking place to damage and need changing in long-term work, change the body that the tooth that damages corresponds can, need not change whole blade disc 61 or spacer 62, and in order to reduce the cost of changing, preferably blade disc 61 or spacer 62's body quantity is the same with blade disc 61 or spacer 62's prong quantity, and when certain prong takes place to damage, only need to change the body that the prong that damages corresponds can. The skewed tooth of spacer 62 and blade disc 61 on the left roller axle 40 is opposite around the axle inclination direction, the skewed tooth of spacer 62 and blade disc 61 on the right roller axle 50 is opposite around the axle inclination direction, skewed tooth on the blade disc 61 inclines along clockwise, skewed tooth on the blade disc 61 is the cutter of the initiative shredding material, skewed tooth on the spacer 62 inclines along counter-clockwise, skewed tooth on the spacer 62 is the cutter of the passive shredding material, for the convenience of description, the skewed tooth shredding material one end tip definition of spacer 62 and blade disc 61 is the prong in the invention, and opposite with spacer 62 and blade disc 61 prong orientation on the roller axle on the axial projection face of left roller axle 40 and right roller axle 50, the most close-point line of skewed tooth tip of corresponding spacer 62 on skewed tooth tip and the right roller axle 50 on the skewed tooth tip of blade disc 61 on the left roller axle 40 and the right roller axle 50 passes through the central line of left roller axle 40 or right roller axle 50, that is, a connecting line of the tooth point of the cutter disc 61 arranged on the left roller shaft 40 or the right roller shaft 50 and the tooth point of the spacer 62 arranged on the right roller shaft 50 or the left roller shaft 40 corresponding to the tooth point passes through the center of the left roller shaft 40 or the right roller shaft 50 at the shearing position, and the connecting line of the tooth point of the spacer 62 on the left roller shaft 40 and the tooth point of the spacer 62 on the right roller shaft 50 corresponding to the tooth point of the spacer 62 on the left roller shaft 40 and the tooth point of the cutter disc 61 on the right roller shaft 50 at the shearing position is through the center line of the left roller shaft 40 or the right roller shaft 50 when the tooth point of the spacer 62 on the left roller shaft 40 and the tooth point of the cutter disc 61 on the right roller shaft 50 corresponding to the tooth point rotate to the shearing position between the left roller shaft 40 and the right roller shaft 50 and correspond to each other because the left roller shaft 40 and the right roller shaft 50 rotate in opposite directions; and the shearing position is the passageway of material between left roller 40 and the right roller 50, therefore no matter the material is horizontal entering or vertical entering, the tooth point of the spacer 62 that corresponds on left roller 40 and the right roller 50 and blade disc 61 all will be sheared and torn the material at the shearing position to cut up the material.

Preferred embodiment of the split cutter head 61 and the spacer 62: every blade disc 61 can comprise 6 tool bits, and every tool bit all arranges according to clockwise or anticlockwise circumference around the main shaft, is provided with 12 dovetail or T-slot on left roller axle 40 or the right roller axle 50, and every tool bit bottom is provided with 2 boss 90 and the dovetail or the T-slot cooperation on left roller axle 40 or the right roller axle 50, and 6 blade bits constitute a blade disc 61 jointly, spacer 62 is with the same reason, because blade disc 61 with spacer 62 interval installation, the lock nut cover is located the both ends of left roller axle 40 and right roller axle 50 are right blade disc 61 and spacer 62 carry out axial fixity, consequently blade disc 61 with spacer 62 need not to install any connecting bolt or locating piece additional can be stably fixed in on left roller axle 40 or the right roller axle 50, consequently, only need during the dismouting the blade disc follow the axial of left roller axle 40 or right roller axle 50 will blade disc 61 or spacer 62 release can, the complicated processes such as the disassembly of bolts and positioning blocks are avoided, the disassembly and the assembly are more convenient, the maintenance and the replacement of the cutter disc 61 and the spacer bush 62 are more convenient and quicker, and the cost is lower.

Preferably, the center distance between the left roller shaft 40 and the right roller shaft 50 is slightly larger than the sum of the addendum circle radii of the cutter disc 61 and the spacer 62, and the sum of the addendum circle radii of the cutter disc 61 and the spacer 62 is the sum of the distance between the circle center of the cutter disc 61 and the tooth tip of the cutter disc 61 and the distance between the circle center of the spacer 62 and the tooth tip of the spacer 62, so that a channel is reserved between the left roller shaft 40 and the right roller shaft 50 for the cut material to pass through, and the cut material falls to a storage box or a conveyor belt through the channel.

Preferably, the teeth with opposite tooth tips are arranged on the circumferential direction of the spacer 62 and the cutter disc 61 on the roller shafts, the tooth tips of the cutter disc 61 on the left roller shaft 40 and the tooth tips of the spacer 62 on the right roller shaft 50 are in the same inclination direction, the tooth tips of the spacer 62 on the left roller shaft 40 and the tooth tips of the cutter disc 61 on the right roller shaft 50 are in the same inclination direction, and the tooth tips of the spacer 62 and the cutter disc on the left roller shaft 40 and the tooth tips of the cutter disc 61 on the right roller shaft 50 are in mutual correspondence at the shearing position due to the spacing arrangement of the spacer 62 and the cutter disc 61 on the roller shafts, so that when the left roller shaft 40 and the right roller shaft 50 synchronously rotate in opposite directions by matching with the synchronizing mechanism, the tooth tips of the cutter disc 61 on the left roller shaft 40 or the right roller shaft 50, the tooth tips of the spacer 62 on the corresponding right roller shaft 50 or the left roller shaft 40, the center of the left roller shaft 40 and the center of the right roller shaft, therefore, the cutter heads 61 corresponding to the left roller shaft 40 and the right roller shaft 50 and the tooth tips of the spacer sleeves 62 participate in shearing materials together when the materials are sheared, and compared with the traditional mode of crushing the materials in an extrusion mode, the materials are easier to shear, and energy consumption and equipment loss are smaller.

As an alternative embodiment, the diameter of the spacer 62 is smaller than that of the cutter disc 61, so that the linear speeds of the tooth tips of the cutter disc 61 and the tooth tips of the spacer 62 are different, thereby having the effect of tearing the sheared material and being easier to tear and shear the material.

Preferably, the teeth of the spacer 62 on the left roller shaft 40 or the right roller shaft 50 are arranged corresponding to the teeth on the cutter disc 61, and the connecting line of the tooth tips of the teeth on the spacer 62 and the axial projection plane of the left roller shaft 40 or the right roller shaft 50 where the tooth tips on the cutter head 61 corresponding to the tooth tips pass through the central line of the left roller shaft 40 or the right roller shaft 50, thereby ensuring that the tooth tips of the corresponding cutter discs 61 and the corresponding spacer sleeves 62 on the left roller shaft 40 and the right roller shaft 50 jointly participate in shearing the materials in the shearing position, and the tooth number of the spacer bush 62 can be equal to that of the cutter disc 61 in the design of teeth, the tooth number of the spacer bush 62 can also be more than that of the cutter disc 61, and preferably, the number of teeth between two adjacent teeth on the spacer 62, which correspond to two adjacent teeth on the cutter disc 61, is the same, that is, the number of teeth on the spacer 60 is an integral multiple of the number of teeth on the cutter disc 50.

Preferably, two adjacent cutter discs 61 arranged on the left roller shaft 40 or the right roller shaft 50 are arranged in a staggered mode, namely, when the cutter discs 61 are sleeved into the left roller shaft 40 or the right roller shaft 50, at least one groove 80 is staggered to be sleeved into the left roller shaft 40 or the right roller shaft 50, the number of the staggered grooves 80 is changed according to the number of teeth on the cutter discs 61, similarly, when the adjacent spacer bushes 62 on the same roller shaft are sleeved into the left roller shaft 40 or the right roller shaft 50, one groove 80 is staggered to be sleeved into the left roller shaft 40 or the right roller shaft 50, so that the cutter discs 61 in different groups and the spacer bushes 62 in different groups can cut materials at different times, and the cutting resistance is reduced.

As an alternative, if the width of the desired shearing material is wide, several groups of identical cutter discs 61 or spacers 62 may be stacked, and the spacers 62 may also be provided as circular spacers 62 without teeth.

Preferably, the synchronizing mechanism includes synchronous gear 1 and synchronous gear 2, and synchronous gear 1 and synchronous gear 2 are installed respectively on left roller axle 40 and right roller axle 50 and intermeshing, the synchronizing mechanism passes through synchronous gear 1 and synchronous gear 2 drive left roller axle 40 and right roller axle 50 rotate in step, in order to guarantee four points collineation when shearing the position is gone up to tooth point, the right roller axle 50 that corresponds of blade disc 61 on left roller axle 40 or the right roller axle 50 or the left roller axle 40 on spacer 62, left roller axle 40 center and the right roller axle 50 center four points to guarantee blade disc 61 and spacer 62 to the shearing effect of material.

Preferably, the distance between the end surface of the cutter assembly 60 mounted on the left roller shaft 40 and the right roller shaft 50 and the inner wall of the box body 30 is larger than the width of a single cutter disc 61 or a spacer 62. In order to facilitate the disassembly and assembly of the damaged cutter disc 61 or spacer 62, the distance between the end surface of the cutter assembly 60 arranged on the left roller shaft 40 and the right roller shaft 50 and the inner wall of the box body 30 is larger than the width of the single cutter disc 61 or spacer 62, because the cutter head 61 and the spacer 62 are sleeved on the left roller shaft 40 or the right roller shaft 50, therefore, when the cutter head 61 and the spacer 62 are disassembled, only the locking nuts arranged at the end parts of the left roller shaft 40 and the right roller shaft 50 are needed to be unscrewed, and one of the cutter head 61 and the spacer 62 is pushed out along the groove 80 arranged on the left roller shaft 40 or the right roller shaft 50, therefore, in order to ensure that the cutter disc 61 and the spacer 62 are smoothly pushed out from the left roller shaft 40 or the right roller shaft 50, the distance between the end surface of the cutter assembly 60 mounted on the left roller shaft 40 and the right roller shaft 50 and the inner wall of the box body 30 needs to be set to be larger than the width of a single cutter disc 61 or spacer 62, and the damaged cutter disc 61 or spacer 62 can be smoothly pushed out for replacement.

Preferably, the device further comprises a frame 110, at least two driving devices 10 are provided, at least two torque limiters 70 and at least two speed reducers 20 matched with the driving devices 10 are provided, the box body 30 and the driving device 10 are fixed on the frame 110, so that the stability is stronger, the driving device 10 is respectively arranged at two ends of the box body 30, the front end of the left roller shaft 40 and the rear end of the right roller shaft 50 are respectively connected with the speed reducer 20, the torque limiter 70 is disposed between the driving device 10 and the speed reducer 20, the driving device 10 at the front end of the box body 30 drives the left roller shaft 40 to rotate through the torque limiter 70 and the speed reducer 20, the driving device 10 at the rear end of the housing 30 drives the right roller shaft 50 to rotate through the torque limiter 70 and the speed reducer 20, thereby realizing the opposite rotation of the left roller shaft 40 and the right roller shaft 50.

Finally, the above embodiments are only used for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution, which should be covered by the claims of the present invention.

Claims (9)

1. The utility model provides a biax scrap steel shredder, includes drive arrangement (10), speed reducer (20), box (30), left roller (40), right roller (50), its characterized in that: the cutter assembly (60) comprises a cutter head (61) and a spacer bush (62); the left roller shaft (40) and the right roller shaft (50) are arranged in the box body (30), cutter heads (61) and spacer bushes (62) which are arranged at intervals are respectively arranged on the left roller shaft (40) and the right roller shaft (50), the spacer bushes (62) on the left roller shaft (40) are arranged corresponding to the cutter heads (61) on the right roller shaft (50), and the cutter heads (61) on the left roller shaft (40) are arranged corresponding to the spacer bushes (62) on the right roller shaft (50); the driving device (10) drives the left roller shaft (40) and the right roller shaft (50) to rotate through the torque limiter (70) and the speed reducer (20), and the synchronous mechanisms are respectively connected with the left roller shaft (40) and the right roller shaft (50).

2. A twin-shaft scrap shredder in accordance with claim 1 wherein: the left roller shaft (40) and the right roller shaft (50) are arranged in parallel, and the left roller shaft (40) and the right roller shaft (50) rotate oppositely; grooves (80) used for installing the cutter head (61) and the spacer bush (62) are formed in the left roller shaft (40) and the right roller shaft (50).

3. A twin-shaft scrap shredder in accordance with claim 2 wherein: be provided with recess (80) complex boss (90) with left roller (40) or right roller (50) on blade disc (61) and spacer (62) respectively, blade disc (61) and spacer (62) pass through boss (90) cooperation recess (80) cover is established and is installed on left roller (40) and right roller (50), locking device (100) axial fixity is passed through at the both ends of left roller (40) and right roller (50) in blade disc (61) or spacer (62).

4. A twin-shaft scrap shredder in accordance with claim 3 wherein: recess (80) are forked tail recess (80) or T shape recess (80), boss (90) correspond for forked tail boss (90) or T shape boss (90).

5. A twin-shaft scrap shredder in accordance with claim 3 wherein: spacer bush (62) and blade disc (61) comprise two at least part bodies, the skewed tooth of spacer bush (62) and blade disc (61) on left side roller axle (40) is opposite around the axle incline direction, the skewed tooth of spacer bush (62) and blade disc (61) on right side roller axle (50) is opposite around the axle incline direction.

6. The twin-shaft scrap shredder according to claim 5 wherein: on the axial projection plane of left roller axle (40) and right roller axle (50), the line when the skewed tooth tip of blade disc (61) on left roller axle (40) and the skewed tooth tip of corresponding spacer (62) on right roller axle (50) are in closest point or furthest point passes through the central line of left roller axle (40) or right roller axle (50).

7. A twin-shaft scrap shredder in accordance with claim 3 wherein: on the axial projection face of left roller (40) and right roller (50), the skewed tooth tip staggered arrangement of adjacent blade disc (61) on left roller (40) or right roller (50), the skewed tooth tip staggered arrangement of adjacent spacer bush (62) on left roller (40) or right roller (50).

8. A twin shaft scrap shredder in accordance with any one of claims 1-6 wherein: the synchronous mechanism comprises a synchronous gear 1 and a synchronous gear 2, wherein the synchronous gear 1 and the synchronous gear 2 are respectively arranged on a left roller shaft (40) and a right roller shaft (50) and are meshed with each other.

9. A twin-shaft scrap shredder in accordance with claim 7 wherein: the distance between the end surfaces of the cutter assemblies (60) arranged on the left roller shaft (40) and the right roller shaft (50) and the inner wall of the box body (30) is larger than the width of a single cutter disc (61) or a spacer bush (62).

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