CN211806721U

CN211806721U - A crushing equipment for production of density fiberboard

Info

Publication number: CN211806721U
Application number: CN202020091398.5U
Authority: CN
Inventors: 苗润发
Original assignee: Tianjin Shengsong Wood Industry Co ltd
Current assignee: Tianjin Shengsong Wood Industry Co ltd
Priority date: 2020-01-16
Filing date: 2020-01-16
Publication date: 2020-10-30
Anticipated expiration: 2030-01-16

Abstract

The utility model relates to a crushing equipment for production of density fiberboard. Comprises a supporting seat, wherein a lower cutter component and an upper cutter component which are in cross fit are rotatably connected on the supporting seat; a screen mesh piece detachably connected with the supporting seat is arranged below the lower cutter assembly, and a discharge conveying line is arranged below the screen mesh piece; the screen mesh piece comprises an arc-shaped plate part and a straight plate part which are integrally formed, and a plurality of groups of material holes are formed in the arc-shaped plate part and the straight plate part; the arc-shaped plate part is bent towards the lower cutter component, the straight plate part is obliquely arranged, and the oblique direction is downward inclined from the discharge end to the feed end; a material recovery conveying line is arranged at the upstream of the discharging conveying line, and the lower end part of the straight plate part is positioned above the conveying surface of the material recovery conveying line; the cutting device also comprises a cutting driving assembly for driving the lower cutter assembly and the upper cutter assembly to synchronously and reversely rotate. The utility model provides a current cutting tool small in quantity, the bulky problem of wood chip that cuts out to the size difference between the wood chip after having reduced the cutting.

Description

A crushing equipment for production of density fiberboard

Technical Field

The utility model belongs to the technical field of the fibreboard processing, especially, relate to a crushing equipment for production of density fibreboard.

Background

One of the boards is classified into low-Density, medium-Density and High-Density boards according to Density, and may be classified into fiber Density boards (also called Density fiberboard), plywood Density boards, wood shaving Density boards, and the like according to raw materials. The fiber density board is an artificial board made of wood fiber or other plant fiber as raw material, through breaking, fiber separation, drying, applying urea-formaldehyde resin or other suitable adhesives, and hot pressing. The fiberboard has the advantages of uniform material, small longitudinal and transverse strength difference, difficult cracking and the like, has wide application, requires 2.5-3 cubic meters of wood for manufacturing 1 cubic meter of fiberboard, can replace 3 cubic meters of sawn timber or 5 cubic meters of log, and is an effective way for comprehensively utilizing wood resources in the development of fiberboard production.

The raw material of the fiber density board is prepared by separating wood into fibers, and chipping is an important one-step process, and mainly chips meeting production specifications are chipped from wood such as poplar wood and the like so as to provide better conditions for fiber separation. Crushing equipment, also called chipper, belongs to one of wood processing series equipment. The method is widely applied to the material preparation workshop section in the production process of the industries of textile, papermaking, pulping, artificial board and the like.

The existing crushing equipment has the following problems: (1) when the existing crushing equipment is used for cutting, the number of cutting tools is small, the volume of the cut wood chips is large, and the processed wood chips need to be processed for multiple times; (2) when in use, the excessive size difference of the chippings can affect the quality of the subsequent pressed molding of the fiber density board.

In order to compensate for the defects of the prior art, the utility model provides a crushing device for the production of density fiberboard.

SUMMERY OF THE UTILITY MODEL

The utility model provides a crushing equipment for production of density fiberboard with compact structure and reasonable design for solving the technical problem existing in the prior art. The utility model discloses can solve current cutting tool is small in quantity, the bulky problem of wood chip that cuts out to the size difference between the wood chip after having reduced the cutting.

The utility model discloses a solve the technical scheme that technical problem that exists among the well-known technique took and be: a crushing device for producing a density fiberboard comprises a supporting seat, wherein a lower cutter assembly and an upper cutter assembly which are distributed vertically and are in cross fit are rotatably connected to the supporting seat; a screen mesh piece detachably connected with the supporting seat is arranged below the lower cutter assembly, and a discharge conveying line is arranged below the screen mesh piece; the screen mesh piece comprises an arc-shaped plate part and a straight plate part which are integrally formed, and a plurality of groups of material holes are formed in the arc-shaped plate part and the straight plate part; the arc-shaped plate part is bent towards the lower cutter component, the straight plate part is obliquely arranged, and the oblique direction is downward inclined from the discharge end to the feed end; a material recovery conveying line is arranged at the upstream of the discharging conveying line, and the lower end part of the straight plate part is positioned above the conveying surface of the material recovery conveying line; the cutting device also comprises a cutting driving assembly for driving the lower cutter assembly and the upper cutter assembly to synchronously and reversely rotate.

The utility model has the advantages that: the utility model provides a crushing device for the production of density fiberboard, which increases the number of cutting tools by arranging a lower cutter component and an upper cutter component, so that the length and thickness of the cut wood chips are more uniform; the cut wood chips can be screened by the screen mesh piece, so that the wood chips meeting the requirements and the wood chips not meeting the requirements are sorted, the size difference between the cut wood chips is further reduced, and the quality of the pressed molding of the fiberboard is improved; conveying the wood chips meeting the requirements to the next working procedure by arranging a discharging conveying line, conveying the wood chips not meeting the size requirements to a recovery position by arranging a material recovery conveying line, and further cutting again; through setting up ejection of compact transfer chain and material recovery transfer chain, can prevent that the wood chip winding from together, causing crushing apparatus's discharge gate to block up.

Preferably: a plurality of groups of lower gear rolling pieces which are transversely arranged in parallel are rotatably connected at the feed end of the supporting seat, and a plurality of groups of upper gear rolling pieces which are transversely arranged in parallel are arranged above the lower gear rolling pieces; the upper hobbing members are connected with a lifting driving device for driving a plurality of groups of upper hobbing members to synchronously and longitudinally move; the lifting driving device and the supporting seat are respectively provided with a rotary driving assembly for driving the hobbing part to rotate, and the upper hobbing part and the lower hobbing part synchronously rotate and have opposite rotation directions.

Preferably: the lifting driving device comprises a mounting plate fixedly connected to the top of the supporting seat, a lifting driving piece with a downward extending end is fixedly connected to the mounting plate, a lifting seat is fixedly connected to the extending end of the lifting driving piece, a hobbing mounting seat is arranged below the lifting seat, a plurality of groups of lifting guide rods longitudinally arranged are fixedly connected to the top of the hobbing mounting seat, and a jacking spring positioned between the lifting seat and the hobbing mounting seat is sleeved on each lifting guide rod; the multiple groups of upper hobbing members are rotationally connected with the hobbing mounting base through rolling bearings.

Preferably: the lower cutter assembly comprises a lower rotating shaft which is transversely arranged and is rotationally connected with the supporting seat through a rolling bearing, a plurality of groups of lower cutter mounting discs are in key connection with the lower rotating shaft, and a plurality of groups of lower cutters which are distributed at equal angles in the circumferential direction are detachably connected on the outer circumferential surface of each lower cutter mounting disc; the upper cutter assembly comprises an upper rotating shaft which is transversely arranged and is rotationally connected with the supporting seat through a rolling bearing, a plurality of groups of upper cutter mounting discs are in keyed connection with the upper rotating shaft, and a plurality of groups of upper cutters which are distributed at equal angles in the circumferential direction are detachably connected to the outer circumferential surface of each upper cutter mounting disc; the lower cutter mounting disc and the upper cutter mounting disc are arranged in a staggered mode.

Preferably: the cutting driving assembly comprises shaft transmission gears which are respectively connected with the upper keys of the lower rotating shaft and the upper rotating shaft, and the two groups of shaft transmission gears are meshed; the speed reducing motor is used for driving the lower rotating shaft/the upper rotating shaft to rotate.

Preferably: the rotary driving assembly comprises driven chain wheels connected with the gear hobbing members in an up-key mode, and adjacent driven chain wheels are in transmission connection through chains; the gear hobbing machine is characterized by further comprising a hobbing driving piece, wherein a driving chain wheel is connected to an output shaft of the hobbing driving piece in a key mode, and the driving chain wheel is in transmission connection with a group of driven chain wheels through a chain.

Preferably: the peripheral walls of the upper gear-rolling piece and the lower gear-rolling piece are both in a sawtooth shape.

Preferably: the supporting seat is hinged with a cutter buckle cover covering the outer side of the upper cutter component, and an opening and closing oil cylinder for driving the cutter buckle cover to turn over is hinged between the cutter buckle cover and the supporting seat.

Drawings

Fig. 1 is a schematic view of the partial sectional structure of the front view of the present invention;

fig. 2 is a schematic perspective view of an upper cutter assembly and a lower cutter assembly according to the present invention;

fig. 3 is a schematic perspective view of a screen member according to the present invention;

fig. 4 is a schematic view of the structure of the present invention.

In the figure: 1. a discharging conveying line; 2. a screen member; 2-1, straight plate portion; 2-2, arc plate portion; 2-3, material holes; 3. the cutter is buckled with a cover; 4. a lower cutter assembly; 4-1, mounting a lower cutter mounting disc; 4-2, cutting down; 4-3, a lower rotating shaft; 5. an upper cutter assembly; 5-1, mounting a cutter mounting disc; 5-2, upper cutter; 5-3, an upper rotating shaft; 6. a lift drive; 6-1, mounting a plate; 6-2, lifting a driving piece; 6-3, a lifting seat; 6-4, lifting guide rods; 6-5, tightly pushing the spring; 6-6, a hobbing mounting seat; 7. a gear hobbing drive; 8. a drive sprocket; 9. an upper hobbing member; 10. a driven sprocket; 11. a lower hobbing member; 12. a supporting seat; 13. a material recovery conveying line; 14. a shaft drive gear; 15. an opening and closing oil cylinder.

Detailed Description

In order to further understand the contents, features and effects of the present invention, the following embodiments are described in detail:

referring to fig. 1, the crushing apparatus for producing density fiberboard of the present invention includes a supporting seat 12, and a lower cutter assembly 4 and an upper cutter assembly 5 which are distributed vertically and are cross-matched are rotatably connected to the supporting seat 12; and the cutting driving assembly is used for driving the lower cutter assembly 4 and the upper cutter assembly 5 to synchronously and reversely rotate.

As shown in FIG. 2, the lower cutter assembly 4 comprises a lower rotating shaft 4-3 which is transversely arranged and is rotatably connected with the supporting seat 12 through a rolling bearing, a plurality of groups of lower cutter mounting discs 4-1 are connected to the upper key of the lower rotating shaft 4-3, a plurality of groups of lower cutters 4-2 which are distributed at equal angles in the circumferential direction are detachably connected to the outer circumferential surface of the lower cutter mounting disc 4-1, and in the embodiment, locking screws are adopted for detachable connection. The upper cutter assembly 5 comprises an upper rotating shaft 5-3 which is transversely arranged and is rotatably connected with the supporting seat 12 through a rolling bearing, a plurality of groups of upper cutter mounting discs 5-1 are in key connection with the upper rotating shaft 5-3, a plurality of groups of upper cutters 5-2 which are distributed according to circumferential equal angles are detachably connected with the outer circumferential surface of the upper cutter mounting disc 5-1, and in the embodiment, locking screws are adopted for detachable connection. The lower cutter mounting disc 4-1 and the upper cutter mounting disc 5-1 are arranged in a staggered mode, and the upper cutter 5-2 and the lower cutter 4-2 are arranged in a staggered mode through the arrangement. The utility model discloses a mode of multiunit cutter cuts timber owing to be used for the cutter of cutting in large quantity for the wood chip length that surely goes out, thickness are more even, and cutting tool stable in structure, and intensity is high, changes simple and conveniently after the cutting tool damage.

The cutting driving assembly comprises shaft transmission gears 14 which are respectively connected with the lower rotating shaft 4-3 and the upper rotating shaft 5-3 through keys, and the two groups of shaft transmission gears 14 are meshed; the device also comprises a speed reducing motor for driving the lower rotating shaft 4-3/the upper rotating shaft 5-3 to rotate.

The speed reduction motor drives the lower rotating shaft 4-3/the upper rotating shaft 5-3 to rotate, in this embodiment, the speed reduction motor drives the lower rotating shaft 4-3 to rotate, specifically, the speed reduction motor is connected with the lower rotating shaft 4-3 through a coupler, or the speed reduction motor is matched with a chain wheel and a chain to pull the lower rotating shaft 4-3 to rotate, which will not be described in detail herein. In this embodiment, the lower cutter assembly 4 rotates counterclockwise and the upper cutter assembly 5 rotates clockwise.

A screen piece 2 detachably connected with the supporting seat 12 is arranged below the lower cutter component 4, and further referring to fig. 3, the screen piece 2 comprises an arc-shaped plate part 2-2 and a straight plate part 2-1 which are integrally formed, and a plurality of groups of material holes 2-3 are respectively arranged on the arc-shaped plate part 2-2 and the straight plate part 2-1; the arc-shaped plate part 2-2 is bent towards the lower cutter component 4, the straight plate part 2-1 is obliquely arranged, and the oblique direction is downward inclined from the discharge end to the feed end; the raised end of the straight plate 2-1 is integrally formed with the lower end of the arc-shaped plate 2-2.

A discharging conveying line 1 is arranged below the screen piece 2; a material recovery conveyor line 13 is provided upstream of the discharge conveyor line 1, and the lower end portion of the straight plate portion 2-1 is located above the conveying surface of the material recovery conveyor line 13.

The cut wood chips can be screened by arranging the screen mesh component 2, and the wood chips meeting the size requirement fall onto the discharging conveying line 1 through the material holes 2-3 and are conveyed to the next working procedure; the chips that do not meet the size requirements cannot pass through the feed holes 2-3 and then slide down the surface of the screen member 2 under the influence of gravity onto the feed recovery conveyor line 13. In this embodiment, the discharging conveyor line 1 and the material recycling conveyor line 13 both adopt belt conveyor lines, and the belt conveyor device comprises two conveying rollers arranged at a transverse interval, an annular belt tensioned between the two conveying rollers, and a servo motor driving the conveying rollers to rotate. The belt of the discharge conveyor line 1 has a carrier section extending horizontally for receiving the satisfactory chips filtered through the screen member 2, and the belt of the feed recovery conveyor line 13 has a carrier section extending horizontally for receiving the unsatisfactory chips filtered through the screen member 2.

A plurality of groups of lower hobbing members 11 which are transversely arranged in parallel are rotatably connected at the feeding end of the supporting seat 12, a plurality of groups of upper hobbing members 9 which are transversely arranged in parallel are arranged above the lower hobbing members 11, and the peripheral walls of the upper hobbing members 9 and the lower hobbing members 11 are all in a sawtooth shape. The upper hobbing assembly 9 and the lower hobbing assembly 11 have the same structure, and in the embodiment, the upper hobbing assembly 9 and the lower hobbing assembly 11 both comprise hobbing mandrels and a plurality of groups of hobbing parts are detachably connected to the peripheral walls of the hobbing mandrels; the multiple groups of the hobbing parts jointly form a columnar outer peripheral wall in a sawtooth shape. The friction between the hobbing assemblies and the wood can be increased by the saw-toothed shapes of the peripheral walls of the upper hobbing assembly and the lower hobbing assembly, so that the anti-skidding effect is achieved, and the feeding efficiency of the wood is increased.

And the upper hobbing members 9 are connected with a lifting driving device 6 for driving a plurality of groups of upper hobbing members 9 to synchronously and longitudinally move. The lifting driving device 6 comprises a mounting plate 6-1 fixedly connected to the top of the supporting seat 12, a lifting driving member 6-2 with a downward extending end is fixedly connected to the mounting plate 6-1, the lifting driving member 6-2 is a hydraulic cylinder or an air cylinder, and a magnetic switch (not shown in the figure) is mounted on the lifting driving member 6-2 and used for detecting the limit position of the extending end of the lifting driving member 6-2 and determining the limit position of the upper hobbing cutter assembly 9 in the up-and-down movement.

A lifting seat 6-3 is fixedly connected to the extending end of the lifting driving piece 6-2, a hobbing mounting seat 6-6 is arranged below the lifting seat 6-3, a plurality of groups of lifting guide rods 6-4 which are longitudinally arranged are fixedly connected to the top of the hobbing mounting seat 6-6, and a limiting plate piece for limiting is fixedly connected to the top of each lifting guide rod 6-4; a jacking spring 6-5 positioned between the lifting seat 6-3 and the hobbing mounting seat 6-6 is sleeved on the lifting guide rod 6-4; the multiple groups of upper hobbing members 9 are rotationally connected with the hobbing mounting seats 6-6 through rolling bearings, and specifically, a hobbing mandrel of the upper hobbing member 9 is rotationally connected with the hobbing mounting seats 6-6 through the rolling bearings. In addition, the hobbing mandrel of the lower hobbing assembly 11 is rotationally connected with the supporting seat 12 through a rolling bearing.

The lifting driving device 6 is arranged to drive the upper hobbing assembly 9 to move longitudinally, and the wood can be clamped by matching with the lower hobbing assembly 11; the lifting guide rod 6-4 and the jacking spring 6-5 are arranged to play a role in buffering, so that the impact force generated in the collision process of the upper hobbing assembly 9 and the wood is reduced.

And rotary driving components for driving the hobbing parts to rotate are arranged on the lifting driving device 6 and the supporting seat 12, and the upper hobbing part 9 and the lower hobbing part 11 synchronously rotate and have opposite rotation directions. The rotary drive assembly comprises driven sprockets 10 keyed on the hobbing members, in this embodiment, the driven sprockets 10 are double-row sprockets, and adjacent driven sprockets 10 are connected by chain transmission. The rotary driving assembly further comprises a hobbing driving piece 7, a driving chain wheel 8 is connected to an output shaft of the hobbing driving piece 7 in a key mode, and the driving chain wheel 8 is in transmission connection with a group of driven chain wheels 10 through a chain.

In the present embodiment, the upper hobbing assembly 9 rotates clockwise, the lower hobbing assembly 11 rotates counterclockwise, and the upper hobbing assembly 9 and the lower hobbing assembly 11 rotate synchronously. Timber is held by the upper and lower cog assemblies 9 and 11 and the lift drive 6 which rotate in unison whilst passing timber between the lower and upper cutter assemblies 4 and 5 for cutting operations. In the cutting process, the lifting driving device 6 and the upper hobbing assembly 9 act together to press wood onto the transmission surface of the lower hobbing assembly 11, so that the horizontal and stable feeding of the wood is ensured, the phenomena of material blocking and material collapsing in the cutting process are prevented, and the safety and the production efficiency of equipment are improved.

As shown in the subject 1 and fig. 4, a cutter cover 3 covering the outer side of the upper cutter assembly 5 is hinged to the support base 12, and an opening and closing cylinder 15 for driving the cutter cover 3 to turn is hinged between the cutter cover 3 and the support base 12. The cylinder barrel of the opening and closing oil cylinder 15 is hinged with the supporting seat 12 through a hinge seat and a pin shaft, and the piston rod is hinged with the cutter buckle cover 3 through the hinge seat and the fisheye joint. An attached magnetic switch (not shown in the figure) is installed on the opening and closing oil cylinder 15 and used for detecting the limit position of the extending end of the opening and closing oil cylinder 15 and determining the limit position of the overturning movement of the cutter buckle cover 3. The cutter buckling cover 3 is arranged to facilitate overhaul and replacement of the cutter for the chipping device, the cutter buckling cover 3 is driven to overturn through the opening and closing oil cylinder 15 to replace a manual overturning cutter buckling cover 3, and the manual labor intensity is reduced.

The utility model discloses still include control system, control system includes control switch and controlling means for example the PLC controller, in addition, lift driving piece 6-2, gear hobbing driving piece 7, gear motor and the hydro-cylinder 15 that opens and shuts all realize the electricity with controlling means and be connected.

The working process is as follows: starting a control switch, wherein the control device controls the extension end of the lifting driving piece 6-2 to extend out of a preset distance, meanwhile, the control device starts the hobbing driving piece 7 to drive the upper hobbing assembly 9 and the lower hobbing assembly 11 to synchronously and reversely rotate, and the control device starts a rotating motor to drive the lower cutter assembly 4 and the upper cutter assembly 5 to rotate; the conveying device matched with the chipping equipment conveys the wood into the feeding ends of the upper hobbing assembly 9 and the lower hobbing assembly 11, and the upper hobbing assembly 9 and the lower hobbing assembly 11 work together to clamp the wood and convey the wood to a position between the lower cutter assembly 4 and the upper cutter assembly 5 for cutting operation. The screen mesh component 2 screens the cut wood chips, and the wood chips meeting the size requirement fall onto the discharging conveying line 1 through the material holes 2-3 and are conveyed to the next working procedure; the chips that do not meet the size requirements slide down the surface of the screen member 2 under the influence of gravity onto a material withdrawal conveyor line 13 and are conveyed to the withdrawal site for re-cutting.

Claims

1. A crushing equipment for density fiberboard production, which is characterized in that: comprises a supporting seat (12), wherein a lower cutter component (4) and an upper cutter component (5) which are distributed up and down and are in cross fit are rotatably connected on the supporting seat (12); a screen piece (2) detachably connected with the supporting seat (12) is arranged below the lower cutter component (4), and a discharge conveying line (1) is arranged below the screen piece (2); the screen mesh part (2) comprises an arc-shaped plate part (2-2) and a straight plate part (2-1) which are integrally formed, and a plurality of groups of material holes (2-3) are formed in the arc-shaped plate part (2-2) and the straight plate part (2-1); the arc-shaped plate part (2-2) is bent towards the lower cutter component (4), the straight plate part (2-1) is obliquely arranged, and the oblique direction is downward from the discharging end to the feeding end; a material recovery conveying line (13) is arranged at the upstream of the discharging conveying line (1), and the lower end part of the straight plate part (2-1) is positioned above the conveying surface of the material recovery conveying line (13); the cutting machine also comprises a cutting driving assembly for driving the lower cutter assembly (4) and the upper cutter assembly (5) to synchronously and reversely rotate.

2. A crushing plant for the production of density fibreboard as claimed in claim 1 wherein: a plurality of groups of lower gear-rolling pieces (11) which are transversely arranged in parallel are rotatably connected at the feed end of the supporting seat (12), and a plurality of groups of upper gear-rolling pieces (9) which are transversely arranged in parallel are arranged above the lower gear-rolling pieces (11); the upper hobbing (9) is connected with a lifting driving device (6) for driving a plurality of groups of upper hobbing (9) to synchronously and longitudinally move; the lifting driving device (6) and the supporting seat (12) are respectively provided with a rotary driving assembly for driving the gear hobbing piece to rotate, and the upper gear hobbing piece (9) and the lower gear hobbing piece (11) synchronously rotate and rotate in opposite directions.

3. A crushing plant for the production of density fibreboard as claimed in claim 2 wherein: the lifting driving device (6) comprises a mounting plate (6-1) fixedly connected to the top of the supporting seat (12), a lifting driving piece (6-2) with an extending end facing downwards is fixedly connected to the mounting plate (6-1), a lifting seat (6-3) is fixedly connected to the extending end of the lifting driving piece (6-2), a hobbing mounting seat (6-6) is arranged below the lifting seat (6-3), a plurality of groups of lifting guide rods (6-4) longitudinally arranged are fixedly connected to the top of the hobbing mounting seat (6-6), and a jacking spring (6-5) positioned between the lifting seat (6-3) and the hobbing mounting seat (6-6) is sleeved on each lifting guide rod (6-4); the multiple groups of upper hobbing members (9) are rotationally connected with the hobbing mounting seats (6-6) through rolling bearings.

4. A crushing plant for the production of density fibreboard as claimed in claim 1 wherein: the lower cutter assembly (4) comprises a lower rotating shaft (4-3) which is transversely arranged and is rotationally connected with the supporting seat (12) through a rolling bearing, a plurality of groups of lower cutter mounting discs (4-1) are in key connection with the lower rotating shaft (4-3), and a plurality of groups of lower cutters (4-2) which are distributed at equal angles in the circumferential direction are detachably connected on the outer circumferential surface of each lower cutter mounting disc (4-1); the upper cutter assembly (5) comprises an upper rotating shaft (5-3) which is transversely arranged and is rotationally connected with the supporting seat (12) through a rolling bearing, a plurality of groups of upper cutter mounting discs (5-1) are connected on the upper rotating shaft (5-3) in a key way, and a plurality of groups of upper cutters (5-2) which are distributed at equal angles in the circumferential direction are detachably connected on the peripheral surface of each upper cutter mounting disc (5-1); the lower cutter mounting disc (4-1) and the upper cutter mounting disc (5-1) are arranged in a staggered manner.

5. The crushing apparatus for density fiberboard production as set forth in claim 4, wherein: the cutting driving assembly comprises shaft transmission gears (14) which are respectively connected with the lower rotating shaft (4-3) and the upper rotating shaft (5-3) through keys, and the two groups of shaft transmission gears (14) are meshed; the device also comprises a speed reducing motor for driving the lower rotating shaft (4-3)/the upper rotating shaft (5-3) to rotate.

6. A crushing plant for the production of density fibreboard as claimed in claim 2 wherein: the rotary driving assembly comprises driven chain wheels (10) which are connected with the gear hobbing members in an up-key mode, and adjacent driven chain wheels (10) are in transmission connection through chains; the gear-type transmission mechanism is characterized by further comprising a hobbing driving piece (7), wherein a driving chain wheel (8) is connected to an output shaft of the hobbing driving piece (7) in a key mode, and the driving chain wheel (8) is in transmission connection with a group of driven chain wheels (10) through a chain.

7. A crushing plant for the production of density fibreboard as claimed in claim 2 wherein: the peripheral walls of the upper gear (9) and the lower gear (11) are both in a sawtooth shape.

8. A crushing plant for the production of density fibreboard as claimed in claim 1 wherein: a cutter buckle cover (3) covering the outer side of the upper cutter component (5) is hinged on the supporting seat (12), and an opening and closing oil cylinder (15) for driving the cutter buckle cover (3) to turn over is hinged between the cutter buckle cover (3) and the supporting seat (12).