Paper shredder
Technical Field
The invention belongs to the technical field of office equipment, and particularly relates to a paper shredder.
Background
Today, people have stronger and stronger confidentiality consciousness due to rapid development of knowledge, and various waste paper technical materials are smashed and then thrown away as garbage. Thus, various paper shredders are widely used in offices.
During the use process of the existing paper shredder, due to the reasons of paper type, paper quality and the like, the phenomenon of paper jam often occurs, and if the paper jam can not be cleared thoroughly in time, the normal work of the paper shredder is influenced, even parts are damaged; when the paper jam phenomenon appears at present, the general way is directly to take out the paper that blocks, then reduces the paper number, and in practical application, because hobbing cutter family paper blocks, the hobbing cutter produces the restriction to the paper, and inconvenient directness is taken out the paper from the kneader, pulls out the crushing effect that influences the paper with the paper by force, causes the damage to the hobbing cutter easily.
Disclosure of Invention
The invention provides an anti-jamming paper shredder for overcoming the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme: a paper shredder comprises a shredder body, a crushing device arranged in the shredder body and a waste paper box arranged below the crushing device, wherein the crushing device comprises a first crushing roller and a second crushing roller which are arranged oppositely, a waste material cavity is formed in the shredder body, the waste paper box is inserted into the waste material cavity, a first movable groove is formed in the side wall of the shredder body, a first sliding block is arranged in the first movable groove, a first connecting block is arranged on the first sliding block, the first crushing roller is detachably connected to the first sliding block, and the first sliding block can drive the first crushing roller to move in the direction away from the second crushing roller; when paper is clamped between the first crushing roller and the second crushing roller, the first connecting block is pushed along the first movable groove, so that the first connecting block drives the first crushing roller to move in the direction away from the second crushing roller, the distance between the first crushing roller and the second crushing roller is increased, the paper is taken out of the crushing device, and the paper is prevented from being clamped between the first crushing roller and the second crushing roller; through the detachable connection of the first crushing roller, the first crushing roller can be conveniently detached from the first sliding block, the first crushing roller is replaced, and the crushing effect on paper is prevented from being influenced by the damage of the crushing roller after working; the mode of stirring first linkage block through the manual work drives first crushing roller and removes, increases the distance of first crushing roller and second crushing roller, and what can be convenient takes out paper from breaker, reduces the circuit setting in the kneader, reduces the operation degree of difficulty of kneader.
A first support spring matched with the first sliding block is arranged in the first movable groove, a third connecting shaft is rotatably connected to the machine body, a rotating plate is arranged on the third connecting shaft, and convex teeth matched with the first connecting block are arranged on the rotating plate; when paper is clamped between the first crushing roller and the second crushing roller, the rotating plate is rotated, the convex teeth on the rotating plate are in contact with the first connecting block, the first connecting block is pushed to move under the action of the convex teeth, and the first sliding block and the first connecting block move together, so that the first crushing roller is driven to move; the first sliding block moves along the first movable groove by rotating the rotating plate, so that the paper shredder is prevented from being pushed when the first sliding block is pushed, labor is saved for pushing the first sliding block to move, and the first sliding block is easier to push; under first supporting spring's effect, make first slider exist all the time toward the power of first activity groove one end motion, make first connecting block reset fast after the dogtooth breaks away from the contact with first connecting block, make first crushing roller be in on the preset position, be convenient for with the mutual cooperation of second crushing roller play crushing effect to the paper.
The first connecting block is provided with a first groove matched with the convex teeth, the first connecting block and the convex teeth are made of magnetic materials, and the magnetism of the first connecting block is repellent to the magnetism of the convex teeth; before the rotating plate rotates to enable the convex teeth to be in contact with the first connecting block, the convex teeth generate thrust on the first connecting block under the action of magnetic force until the convex teeth rotate to the first connecting block, so that the convex teeth can push the first connecting block to move more easily; under the mutual matching of the magnetic force and the thrust, the first connecting block can be easily pushed, the difficulty of pushing the first connecting block is reduced, and the rotating plate is easier to rotate; under the mutually supporting of first recess and dogtooth, the first connecting block of being convenient for mutually supports with the dogtooth, makes the better first connecting block motion of promotion of dogtooth, is convenient for to the change of first crushing roller.
Two sides of the first movable groove are respectively provided with a first movable cavity, a connecting spring is arranged in the first movable cavity, the top of the connecting spring is provided with a connecting plate, a second connecting block is rotatably connected onto the connecting plate, and the second connecting block is matched with the first movable cavity; when the paper shredder works normally, the second connecting block is positioned at the top of the first movable cavity, and the second connecting block is rotated around the connecting point, so that one end of the second connecting block is contacted with the first connecting block, and the second connecting block provides supporting force for the first connecting block, thereby preventing the paper shredder from generating change in the distance between the first crushing roller and the second crushing roller when in work and influencing the paper shredding effect; when paper card was between first crushing roller and second crushing roller, rotated the second connecting block, made the second connecting block rotate with first activity chamber corresponding position on, made the second connecting block enter into first activity intracavity under the effect of coupling spring, prevented that the second connecting block from causing the hindrance to the removal of first connecting block, was convenient for take out the paper of card between first crushing roller and second crushing roller.
A first sliding groove is formed in the inner wall of the first movable cavity, and a second sliding block matched with the first sliding groove is arranged on the side wall of the connecting plate; a second groove is formed in the second connecting block, a pull rod is movably connected in the second groove, and a limiting spring matched with the pull rod is arranged at the bottom of the second groove; under the mutual matching of the first sliding block and the first sliding groove, the connecting plate is limited, and the second connecting block is prevented from driving the connecting plate to rotate when rotating, so that the second connecting block can rotate relative to the connecting plate; after the paper clamped between the first crushing roller and the second crushing roller is taken out, the rotating plate is rotated to an initial position, the first sliding block is moved to one end of the first movable groove under the action of the first supporting spring, one end of the pull rod is pried to rotate around the connecting point, the second connecting block is pulled out of the first movable cavity under the action of the pull rod, the second connecting block provides a good supporting effect for the first connecting block, and the first crushing roller is prevented from moving during working; under the action of the limiting spring, one end of the pull rod is always in a tilting state, so that the pull rod is conveniently pulled out of the second groove; with the pull rod setting in the second recess, avoid the second connecting block to cause the hindrance to the removal of first connecting block after entering into first activity intracavity, be convenient for increase the interval of first crushing roller and second crushing roller under the effect of commentaries on classics board, prevent that the breaker of paper from interior card extremely.
Two sides of the first crushing roller are provided with first connecting shafts, second movable cavities are arranged in the first connecting shafts, first limiting plates are arranged in the second movable cavities, first threaded holes are formed in the first limiting plates, second threaded holes are formed in the first connecting blocks, third threaded holes are formed in the first sliding blocks, and the first threaded holes, the second threaded holes and the third threaded holes are matched with each other; the first crushing roller is connected with the first sliding block through the first connecting shaft, and the first crushing roller is conveniently fixed on the first sliding block under the mutual matching of the threaded holes, so that the first sliding block can conveniently drive the first crushing roller to move when moving; under the effect of first limiting plate, make first crushing roller form the rotation that does not influence first crushing roller when being connected the cooperation with first slider, make first crushing roller can be normal with the cooperation of second crushing roller work, play good crushing effect to the paper.
A through groove is formed in the side wall of the first connecting shaft, a second sliding groove is formed in the inner wall of the through groove, a push plate is arranged in the through groove, a second limiting plate matched with the second sliding groove is arranged at the bottom of the push plate, and a fixing plate matched with the first limiting plate is arranged at the bottom of the second limiting plate; when the first crushing roller is damaged and needs to be replaced, the machine body is opened, the first crushing roller is rotated, the push plate is rotated to the top position of the first connecting shaft, the push plate is pressed downwards, the fixing plate moves downwards to be in contact with the first limiting plate, the fixing plate plays a role in fixing the first limiting plate, the first limiting plate cannot rotate, a screw can be conveniently rotated out of the first threaded hole, and the first crushing roller can be conveniently replaced; under mutually supporting of second limiting plate and second spout, play limiting displacement to the push pedal, fix the push pedal in leading to the inslot, prevent that the push pedal from falling out from leading to the inslot, promote the connection effect of push pedal and logical groove.
A second supporting spring is arranged in the second sliding chute, and a rubber pad is arranged at the bottom of the fixing plate; when the first crushing roller works normally, the second limiting plate is positioned at the top of the second chute under the action of the second supporting spring, so that the fixed plate is prevented from contacting with the first limiting plate, and the first crushing roller can rotate normally; under the effect of rubber pad, make the fixed plate increase the area of contact of fixed plate and first limiting plate when descending, promote the fixed effect of fixed plate to first limiting plate, can be convenient take out the screw from first threaded hole, be convenient for to the change of first crushing roller.
Two sides of the second crushing roller are respectively provided with a second connecting shaft, the inner wall of the machine body is provided with a first mounting block matched with the second connecting shaft, the first mounting block is provided with a second mounting block, the bottom of the second mounting block is provided with a connecting rod, and the first mounting block is provided with a connecting groove matched with the connecting rod; first installation piece and second installation piece play the linkage to the second crushing roller, when installing the second crushing roller, place the second connecting axle on first installation piece, again with second installation piece lid on first installation piece, make the connecting rod insert in the spread groove, play fixed action to first installation piece and second installation piece under the mutually supporting of connecting rod and spread groove, thereby play fixed action to the second connecting axle, fix the second crushing roller in the organism, be convenient for play crushing to the paper.
The connecting rod is provided with a mounting groove, a fixed spring is arranged in the mounting groove, the top of the fixed spring is provided with a first limiting block, and the side wall of the connecting groove is provided with a limiting groove matched with the first limiting block; after the first limiting block moves to the position of the limiting groove, the first limiting block extends out of the mounting groove under the action of the fixing spring, so that the first limiting block is matched with the limiting groove to fix the second mounting block and prevent the second mounting block from being separated from the first mounting block; when the second crushing roller is damaged and needs to be replaced, the first limiting block is pressed into the mounting groove, the first limiting block and the limiting groove are disengaged from each other, the second mounting block is conveniently detached from the first mounting block, and therefore the second crushing roller can be conveniently taken out from the first mounting block, and the second crushing roller is conveniently replaced.
The invention has the following advantages: when paper card when first crushing roller and second crushing roller, promote first linkage block along first movable groove, make first linkage block drive first crushing roller and toward keeping away from the removal of second crushing roller direction, increase the interval between first crushing roller and the second crushing roller, take out paper from breaker again, prevent that the paper card from dying between first crushing roller and second crushing roller.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an enlarged view of a portion a in fig. 1.
Fig. 3 is a first cross-sectional view of the present invention.
Fig. 4 is an enlarged view of fig. 3 at B.
FIG. 5 is a second cross-sectional view of the present invention.
Fig. 6 is an enlarged view of fig. 5 at C.
Fig. 7 is an enlarged view of fig. 6 at D.
Fig. 8 is a third schematic cross-sectional view of the present invention.
Fig. 9 is a fourth schematic cross-sectional view of the present invention.
Fig. 10 is an enlarged view of fig. 9 at E.
Fig. 11 is a cross-sectional view of the fifth embodiment of the present invention.
Fig. 12 is an enlarged view of fig. 11 at F.
Fig. 13 is a sixth schematic sectional view of the present invention.
Fig. 14 is an enlarged view at G in fig. 13.
Fig. 15 is a schematic cross-sectional view seven of the present invention.
Detailed Description
As shown in fig. 1-15, a paper shredder comprises a body 1, a crushing device arranged in the body 1 and a waste paper box 2 arranged below the crushing device, wherein the crushing device comprises a first crushing roller 5 and a second crushing roller 6, the first crushing roller 5 and the second crushing roller 6 are arranged oppositely, and a certain distance is left between the first crushing roller and the inner wall of the body, so that the air flow flux in the body is increased, the first crushing roller and the second crushing roller are cooled, and the crushing device is protected; the mode of driving the first crushing roller and the second crushing roller to rotate is the same as the working principle of the existing paper shredder, and the detailed description is omitted; a waste material cavity is formed in the machine body 1, the waste paper box 2 is inserted into the waste material cavity, paper drops in the waste paper box after being crushed by the crushing device, and paper scraps are collected through the waste paper box, so that the paper scraps can be conveniently and uniformly treated; a first movable groove 12 is formed in the side wall of the machine body 1, a first sliding block 131 is arranged in the first movable groove 12, a first connecting block 13 is arranged on the first sliding block 131, the first crushing roller 5 is detachably connected to the first sliding block 131, and the first sliding block 131 can drive the first crushing roller 5 to move in the direction away from the second crushing roller 6; when paper is clamped between the first crushing roller and the second crushing roller, the first connecting block is pushed along the first movable groove, so that the first connecting block drives the first crushing roller to move in the direction away from the second crushing roller, the distance between the first crushing roller and the second crushing roller is increased, the paper is taken out of the crushing device, and the paper is prevented from being clamped between the first crushing roller and the second crushing roller; through the detachable connection of the first crushing roller, the first crushing roller can be conveniently detached from the first sliding block, the first crushing roller is replaced, and the crushing effect on paper is prevented from being influenced by the damage of the crushing roller after working; the mode of stirring first linkage block through the manual work drives first crushing roller and removes, increases the distance of first crushing roller and second crushing roller, and what can be convenient takes out paper from breaker, reduces the circuit setting in the kneader, reduces the operation degree of difficulty of kneader.
A first supporting spring 121 matched with the first sliding block 131 is arranged in the first movable groove 12, a third connecting shaft is rotatably connected to the machine body 1 and arranged at one end of the first movable groove, a rotating plate 14 is arranged on the third connecting shaft, convex teeth matched with the first connecting block 13 are arranged on the rotating plate 14, and a handle is arranged on the rotating plate to facilitate rotation of the rotating plate; when paper is clamped between the first crushing roller and the second crushing roller, the rotating plate is rotated, the convex teeth on the rotating plate are in contact with the first connecting block, the first connecting block is pushed to move under the action of the convex teeth, and the first sliding block and the first connecting block move together, so that the first crushing roller is driven to move; the first sliding block moves along the first movable groove by rotating the rotating plate, so that the paper shredder is prevented from being pushed when the first sliding block is pushed, labor is saved for pushing the first sliding block to move, and the first sliding block is easier to push; under first supporting spring's effect, make first slider exist all the time toward the power of first activity groove one end motion, make first connecting block reset fast after the dogtooth breaks away from the contact with first connecting block, make first crushing roller be in on the preset position, be convenient for with the mutual cooperation of second crushing roller play crushing effect to the paper.
The first connecting block 13 is provided with a first groove 132 matched with the convex teeth, the first connecting block 13 and the convex teeth are made of magnetic materials, and the magnetism of the first connecting block 13 is repulsive to the magnetism of the convex teeth; before the rotating plate rotates to enable the convex teeth to be in contact with the first connecting block, the convex teeth generate thrust on the first connecting block under the action of magnetic force until the convex teeth rotate to the first connecting block, so that the convex teeth can push the first connecting block to move more easily; under the mutual matching of the magnetic force and the thrust, the first connecting block can be easily pushed, the difficulty of pushing the first connecting block is reduced, and the rotating plate is easier to rotate; under the mutually supporting of first recess and dogtooth, the first connecting block of being convenient for mutually supports with the dogtooth, makes the better first connecting block motion of promotion of dogtooth, is convenient for to the change of first crushing roller.
Two sides of the first movable groove 12 are respectively provided with a first movable cavity 15, a connecting spring 152 is arranged in the first movable cavity 15, the top of the connecting spring 152 is provided with a connecting plate 153, the connecting plate 153 is rotatably connected with a second connecting block 16, and the second connecting block 16 is matched with the first movable cavity 15; when the paper shredder works normally, the second connecting block is positioned at the top of the first movable cavity, and the second connecting block is rotated around the connecting point, so that one end of the second connecting block is contacted with the first connecting block, and the second connecting block provides supporting force for the first connecting block, thereby preventing the paper shredder from generating change in the distance between the first crushing roller and the second crushing roller when in work and influencing the paper shredding effect; when paper card was between first crushing roller and second crushing roller, rotated the second connecting block, made the second connecting block rotate with first activity chamber corresponding position on, made the second connecting block enter into first activity intracavity under the effect of coupling spring, prevented that the second connecting block from causing the hindrance to the removal of first connecting block, was convenient for take out the paper of card between first crushing roller and second crushing roller.
A first sliding groove 151 is formed in the inner wall of the first movable cavity 15, and a second sliding block matched with the first sliding groove 151 is arranged on the side wall of the connecting plate 153; a second groove 161 is formed in the second connecting block 16, a pull rod 162 is movably connected in the second groove 161, one end of the pull rod is hinged to the inner wall of the second groove, and a limiting spring 163 matched with the pull rod 162 is arranged at the bottom of the second groove 161; under the mutual matching of the first sliding block and the first sliding groove, the connecting plate is limited, and the second connecting block is prevented from driving the connecting plate to rotate when rotating, so that the second connecting block can rotate relative to the connecting plate; after the paper clamped between the first crushing roller and the second crushing roller is taken out, the rotating plate is rotated to an initial position, the first sliding block is moved to one end of the first movable groove under the action of the first supporting spring, one end of the pull rod is pried to rotate around the connecting point, the second connecting block is pulled out of the first movable cavity under the action of the pull rod, the second connecting block provides a good supporting effect for the first connecting block, and the first crushing roller is prevented from moving during working; under the action of the limiting spring, one end of the pull rod is always in a tilting state, so that the pull rod is conveniently pulled out of the second groove; with the pull rod setting in the second recess, avoid the second connecting block to cause the hindrance to the removal of first connecting block after entering into first activity intracavity, be convenient for increase the interval of first crushing roller and second crushing roller under the effect of commentaries on classics board, prevent that the breaker of paper from interior card extremely.
The two sides of the first crushing roller 5 are provided with first connecting shafts, second movable cavities are arranged in the first connecting shafts, first limiting plates 51 are arranged in the second movable cavities, first threaded holes are formed in the first limiting plates 51, second threaded holes are formed in the first connecting blocks 13, third threaded holes are formed in the first sliding blocks 131, the first threaded holes, the second threaded holes and the third threaded holes are matched with each other, the first crushing roller is connected with the first sliding blocks through screws 17, the threads penetrate through the first threaded holes, the second threaded holes and the third threaded holes, and one ends of the screws are arranged on the outer sides of the first connecting blocks, so that the screws can be rotated conveniently; the first crushing roller is connected with the first sliding block through the first connecting shaft, and the first crushing roller is conveniently fixed on the first sliding block under the mutual matching of the threaded holes, so that the first sliding block can conveniently drive the first crushing roller to move when moving; under the effect of first limiting plate, make first crushing roller form the rotation that does not influence first crushing roller when being connected the cooperation with first slider, make first crushing roller can be normal with the cooperation of second crushing roller work, play good crushing effect to the paper.
A through groove is formed in the side wall of the first connecting shaft, a second sliding groove 53 is formed in the inner wall of the through groove, a push plate 52 is arranged in the through groove, a second limiting plate 521 matched with the second sliding groove 53 is arranged at the bottom of the push plate 52, a fixing plate 522 matched with the first limiting plate 51 is arranged at the bottom of the second limiting plate 521, and the shape of the fixing plate corresponds to that of the first limiting plate; when the first crushing roller is damaged and needs to be replaced, the machine body is opened, the first crushing roller is rotated, the push plate is rotated to the top position of the first connecting shaft, the push plate is pressed downwards, the fixing plate moves downwards to be in contact with the first limiting plate, the fixing plate plays a role in fixing the first limiting plate, the first limiting plate cannot rotate, a screw can be conveniently rotated out of the first threaded hole, and the first crushing roller can be conveniently replaced; under mutually supporting of second limiting plate and second spout, play limiting displacement to the push pedal, fix the push pedal in leading to the inslot, prevent that the push pedal from falling out from leading to the inslot, promote the connection effect of push pedal and logical groove.
A second supporting spring 531 is arranged in the second sliding chute 53, and a rubber pad is arranged at the bottom of the fixing plate 522; when the first crushing roller works normally, the second limiting plate is positioned at the top of the second chute under the action of the second supporting spring, so that the fixed plate is prevented from contacting with the first limiting plate, and the first crushing roller can rotate normally; under the effect of rubber pad, make the fixed plate increase the area of contact of fixed plate and first limiting plate when descending, promote the fixed effect of fixed plate to first limiting plate, can be convenient take out the screw from first threaded hole, be convenient for to the change of first crushing roller.
Two sides of the second crushing roller 6 are respectively provided with a second connecting shaft, the inner wall of the machine body 1 is provided with a first mounting block 62 matched with the second connecting shaft, the first mounting block 62 is provided with a second mounting block 61, the bottom of the second mounting block 62 is provided with a connecting rod 611, and the first mounting block 62 is provided with a connecting groove matched with the connecting rod 611; first installation piece and second installation piece play the linkage to the second crushing roller, when installing the second crushing roller, place the second connecting axle on first installation piece, again with second installation piece lid on first installation piece, make the connecting rod insert in the spread groove, play fixed action to first installation piece and second installation piece under the mutually supporting of connecting rod and spread groove, thereby play fixed action to the second connecting axle, fix the second crushing roller in the organism, be convenient for play crushing to the paper.
An installation groove 613 is formed in the connecting rod 611, a fixed spring 614 is arranged in the installation groove 613, a first limiting block 612 is arranged at the top of the fixed spring 614, and a limiting groove 621 matched with the first limiting block 612 is formed in the side wall of the connection groove; after the first limiting block moves to the position of the limiting groove, the first limiting block extends out of the mounting groove under the action of the fixing spring, so that the first limiting block is matched with the limiting groove to fix the second mounting block and prevent the second mounting block from being separated from the first mounting block; when the second crushing roller is damaged and needs to be replaced, the first limiting block is pressed into the mounting groove, the first limiting block and the limiting groove are disengaged from each other, the second mounting block is conveniently detached from the first mounting block, and therefore the second crushing roller can be conveniently taken out from the first mounting block, and the second crushing roller is conveniently replaced.
The top of the machine body 1 is movably connected with a cover plate 3, one end of the cover plate is hinged to the inner wall of the machine body, a third movable cavity 32 is arranged in the cover plate 3, a movable plate 4 penetrates through the third movable cavity 32, and the movable plate 4 can move along the inner wall of the third movable cavity 32; after the paper shredder completes paper shredding work, the movable plate is pushed into the third movable cavity, the cover plate is rotated around the connecting point and is opened, the crushing device is exposed outside, paper scraps on the first crushing roller and the second crushing roller are convenient to reject, and the paper scraps are prevented from being stained on the crushing rollers to influence the crushing effect of the crushing rollers on paper.
A second movable groove 11 is formed in the inner wall of the top of the machine body 1, a third sliding groove 111 is formed in the bottom of the second movable groove 11, and a third sliding block 43 matched with the third sliding groove 111 is arranged on the side wall of the movable plate 4; when the paper shredder works, the cover plate covers the crushing device, the third sliding block enters the second movable groove and then moves to the tail end of the third sliding groove along the third sliding groove, and under the matching of the third sliding block and the third sliding groove, supporting force is provided for the cover plate, so that the cover plate is stably fixed above the crushing device, and the use safety of the paper shredder is ensured; under the matching of the third sliding groove and the third sliding block, the cover plate cannot be easily opened, so that the potential safety hazard caused by the paper shredder is reduced; when the cover plate needs to be opened, the movable plate is pushed into the third movable cavity, the third sliding block moves to the position of the second movable groove, the cover plate is turned upwards, the third sliding block moves upwards along the inner wall of the second movable groove, and therefore the movable plate is disengaged from the machine body, the machine body is convenient to open, and the crushing device can be conveniently cleaned.
A second limiting block 42 is arranged at one end of the movable plate 4, and a pushing block 41 is arranged on the movable plate 4; under the action of the second limiting block, the movable plate is prevented from being separated from the third movable cavity, and the connecting effect of the movable plate and the cover plate is ensured; the arrangement of the pushing block facilitates pushing the movable plate into the third movable cavity, and the position of the third sliding block is determined conveniently by means of the position of the pushing block, so that the third sliding block is better matched with the second movable groove.
A paper inlet 31 is formed in the cover plate 3, the paper inlet penetrates through the third movable cavity, and the paper inlet 31 is arranged above the crushing device; the paper is put into a paper shredder through a paper inlet for shredding; under the cooperation of the movable plate and the third movable cavity, the paper inlet can be sealed, and the crushing roller is prevented from being damaged by sundries falling to the crushing device.
One end of the movable plate 4 is provided with a first magnetic block, the inner wall of the machine body 1 is provided with a second magnetic block, and the first magnetic block and the second magnetic block are attracted magnetically; when the cover plate covers the crushing device, the movable plate is pushed along the third slide rail to enable the first magnetic block to be in contact with the second magnetic block, the coupling effect of the movable plate and the inner wall of the machine body is increased under the action of magnetic force, the third slide block is fixed to a certain extent, the crushing device is prevented from being directly exposed outside, and the potential safety hazard of the paper shredder is reduced.