CN113815034A

CN113815034A - Three-side book trimmer book pressing structure without adjustment

Info

Publication number: CN113815034A
Application number: CN202111091449.XA
Authority: CN
Inventors: 陈占军; 卢道胜
Original assignee: Tongli Paper Products Heyuan Co ltd
Current assignee: Tongli Paper Products Heyuan Co ltd
Priority date: 2021-09-17
Filing date: 2021-09-17
Publication date: 2021-12-21

Abstract

The invention discloses a book pressing structure of a three-side book trimmer without adjustment, which comprises a base, wherein a placing box is arranged on one side of the base, a supporting column is arranged on the upper side of the base, a top plate is fixedly connected to the upper side of the supporting column, a first belt pulley is arranged on the upper side of the top plate, a screw rod is arranged in the middle of the first belt pulley, a pressing plate is fixedly connected to the lower side of the screw rod, a pressing block is fixedly connected to the lower side of the pressing plate, a driving cavity is arranged in the base, a motor is fixedly connected to the bottom of the driving cavity, a connecting pipe is slidably connected to the outer side of a main shaft of the motor, a first rotating pipe and a second rotating pipe are arranged on the outer side of the connecting pipe, a protective box is fixedly connected to the upper side of the base, a fixing plate is fixedly connected to the inner side of the protective box, a second belt pulley is fixedly connected to the outer side of the second rotating pipe, and a belt is sleeved on the outer sides of the first belt pulley and the second belt pulley. According to the book cutting device, the first rotating pipe and the second rotating pipe are arranged, so that books with different heights can be cut, the books can be taken conveniently, and accidents caused by cutting fingers are avoided.

Description

Three-side book trimmer book pressing structure without adjustment

Technical Field

The invention relates to the technical field of book binding, in particular to a book pressing structure of a three-side book trimming machine without adjustment.

Background

In a traditional three-side book trimming machine, when the thickness of books changes, a book pressing mechanism needs to be stopped to manually adjust the thickness of the pressed books. Although the mode has little influence on the same-specification mass production, the efficiency is low and the production cost is high for small-batch and multi-variety digital printing production flows which need to frequently change the specification, and similarly, books to be processed need to be manually taken, if the operation is improper, the fingers of a user are easily cut, and certain potential safety hazards are caused.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and provides a book pressing structure of a three-side book trimmer without adjustment, so that the problems in the prior art are solved.

In order to achieve the purpose, the invention adopts the following technical scheme:

a book pressing structure of a three-side book trimmer without adjustment comprises a base, wherein a sliding groove is formed in one side of the base, a placing box is connected in the sliding groove in a sliding mode, two supporting columns are arranged on the upper side of the base, a top plate is fixedly connected to the upper sides of the supporting columns, a first belt pulley is arranged on the upper side of the top plate, a screw rod is arranged in the middle of the first belt pulley, a pressing plate is fixedly connected to the lower side of the screw rod, a pressing block is fixedly connected to the lower side of the pressing plate, a driving cavity is formed in the base, a motor is fixedly connected to the bottom of the driving cavity, a connecting pipe is slidably connected to the outer side of a main shaft of the motor, a first rotating pipe and a second rotating pipe are arranged on the outer side of the connecting pipe, a protective box is fixedly connected to the upper side of the base, a fixing plate is fixedly connected to the inner wall of the protective box, and the second rotating pipe is rotatably connected with the fixing plate, the outside fixedly connected with second belt pulley of second rotating tube, the second belt pulley corresponds the setting with first belt pulley, the outside cover of first belt pulley and second belt pulley has the belt.

Preferably, the tank bottom of spout is equipped with two recesses, place two gyro wheels of downside fixedly connected with of box, the gyro wheel corresponds the setting with the recess, inner wall one side of spout is equipped with two constant head tanks, place two location strips of one side fixedly connected with of box, the location strip corresponds setting and sliding connection with the constant head tank.

Preferably, the inner wall both sides of placing the box all are equipped with the fixed chamber of a plurality of, fixed intracavity sliding connection has the fixed plate, the first spring of fixedly connected with between the inner wall of fixed plate and fixed chamber, the opposite side fixedly connected with extension rod of fixed plate, the extension rod passes fixed chamber and fixedly connected with splint.

Preferably, the inner wall both sides of drive chamber rotate jointly and are connected with first pivot, the first bevel gear of outside fixedly connected with of first pivot, the middle part of first pivot is equipped with first screw thread section, the outside threaded connection of first screw thread section has the sleeve, telescopic one side fixedly connected with connecting block, inner wall one side of drive chamber is equipped with the first groove of dodging, the connecting block passes the first groove of dodging and dodges groove sliding connection with the first, the connecting block with place box fixed connection.

Preferably, a supporting plate is fixedly connected to the inside of the driving cavity, a second rotating shaft is rotatably connected to the middle of the supporting plate, second bevel gears are fixedly connected to both ends of the second rotating shaft, the first rotating pipe penetrates through the upper side of the driving cavity and is rotatably connected with the base, a third bevel gear is fixedly connected to the outer side of the first rotating pipe, the first bevel gear is meshed with the second bevel gear, and the third bevel gear is meshed with the second bevel gear.

Preferably, fixedly connected with second spring between the main shaft end of motor and the inner wall of connecting pipe, the outside fixedly connected with a plurality of first axle key of motor main shaft, the inner wall of connecting pipe is equipped with the first keyway of a plurality of, first axle key corresponds with first keyway and sets up and sliding connection.

Preferably, the outside fixedly connected with a plurality of second shaft key of connecting pipe, the inner wall of first rotating pipe is equipped with a plurality of second keyway, the inner wall of second rotating pipe is equipped with a plurality of third keyway, second keyway and third keyway all correspond the setting with the second shaft key, the upside of second rotating pipe rotates with the inner wall upside of guard box to be connected, the upside of guard box is equipped with the thread groove, thread groove female connection has the thread piece, the thread piece rotates with the connecting pipe to be connected.

Preferably, the upside of roof is equipped with heavy groove, heavy inslot internal rotation is connected with solid fixed ring, gu fixed ring and first belt pulley fixed connection, the middle part of first belt pulley is equipped with first screw hole, screw rod and first screw hole threaded connection.

Preferably, one side of clamp plate is equipped with four second screw holes, second screw hole female connection has the screwed pipe, sliding connection has the locating lever in the screwed pipe, the outside fixedly connected with slide of locating lever, one side of briquetting is equipped with the dashpot, the inner wall sliding connection of slide and dashpot, be equipped with the third spring between screwed pipe and the slide.

The invention has the advantages that: the three-side book trimmer book pressing structure without adjustment provided by the invention has the advantages that the first rotating pipe and the second rotating pipe are arranged, when the first rotating pipe rotates, the placing box can be pushed out or retracted, books can be conveniently taken, accidents caused by cutting fingers are avoided, when the second rotating pipe rotates, the pressing plate can be driven to move downwards to extrude and fix books with different heights, so that the books with different heights can be conveniently cut,

drawings

FIG. 1 is a schematic diagram of the basic structure of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a partial enlarged view of FIG. 1 at B;

fig. 4 is a partially enlarged view of fig. 1 at C.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

As shown in fig. 1-4, the book pressing structure of the three-side book trimming machine without adjustment provided by the invention comprises a base 1, a sliding groove 11 is arranged on one side of the base 1, a placing box 2 is connected in the sliding groove 11 in a sliding manner, a book 25 is arranged in the placing box 2 and used for placing the book 25, a plurality of fixing cavities 23 are arranged on two sides of the inner wall of the placing box 2, fixing plates 231 are connected in the fixing cavities 23 in a sliding manner, first springs 232 are fixedly connected between the fixing plates 231 and the inner walls of the fixing cavities 23, extension rods 233 are fixedly connected on the other side of the fixing plates 231, the extension rods 233 penetrate through the fixing cavities 23 and are fixedly connected with clamping plates 24, when the book 25 is placed at the bottom of the placing box 2, two sides of the book 25 extrude the clamping plates 24 to push the clamping plates 24, the clamping plates 24 push the clamping plates 24 and push the fixing plates 231 to slide in the fixing cavities 23 through the extension rods 233, and extrude the first springs 232 at the same time, the reaction force of the first spring 232 enables the clamping plate 24 to clamp the two sides of the book 25, so as to fix the book 25 better and improve the cutting quality, the bottom of the chute 11 is provided with two grooves 111, the lower side of the placing box 2 is fixedly connected with two rollers 21, the rollers 21 are arranged corresponding to the grooves 111, one side of the inner wall of the chute 11 is provided with two positioning grooves, one side of the placing box 2 is fixedly connected with two positioning strips 22, the positioning strips 22 are arranged corresponding to the positioning grooves and are in sliding connection, through the arrangement of the rollers 21, the friction between the placing box 2 and the bottom of the chute 11 can be reduced, so that the placing box 2 can move more smoothly, the positioning strips 22 are matched with the positioning grooves and can play a role of guiding, the placing box 2 is prevented from deviating in the moving process, the upper side of the base 1 is provided with two supporting columns 12, the upper sides of the supporting columns 12 are fixedly connected with the top plate 3, the top plate 3 and the support pillar 12 are fixedly connected through a screw, the upper side of the top plate 3 is provided with a first belt pulley 31, the middle part of the first belt pulley 31 is provided with a screw rod 32, the upper side of the top plate 3 is provided with a sinking groove, a fixing ring 33 is rotatably connected in the sinking groove, the fixing ring 33 is fixedly connected with the first belt pulley 31, the middle part of the first belt pulley 31 is provided with a first threaded hole, the screw rod 32 is in threaded connection with the first threaded hole, the bottom of the sinking groove is provided with a through hole, the lower end of the screw rod 32 passes through the through hole and is not contacted with the inner wall of the through hole, when the first belt pulley 31 rotates, the first belt pulley 31 can drive the fixing ring 33 to rotate together in the sinking groove, the lower side of the screw rod 32 is fixedly connected with a pressure plate 4, both sides of the pressure plate 4 are provided with sliding holes, the support pillar 12 passes through the sliding holes and is in sliding connection with the sliding holes, the support pillar 12 can play a role in limiting and guiding role on the pressure plate 4, so that the pressure plate 4 can play a limiting role on the screw rod 32, avoid screw rod 32 to follow first belt pulley 31 and rotate jointly to make screw rod 32 carry out the up-and-down motion with the mode of screw precession along first screw hole, screw rod 32 drives clamp plate 4 again along the common up-and-down motion of support column 12, the downside fixedly connected with briquetting 41 of clamp plate 4, and clamp plate 4 drives briquetting 41 joint movement, realizes the extrusion of not co-altitude books 25 fixed.

The inner part of the base 1 is provided with a driving cavity 13, the bottom of the driving cavity 13 is fixedly connected with a motor 131, a main shaft of the motor 131 does not have a self-locking function and can rotate when the motor 131 is not started, the outer side of the main shaft of the motor 131 is slidably connected with a connecting pipe 5, the outer side of the connecting pipe 5 is provided with a first rotating pipe 51 and a second rotating pipe 52, the first rotating pipe 51 passes through the upper side of the driving cavity 13 and is rotatably connected with the base 1, two sides of the inner wall of the driving cavity 13 are rotatably connected with a first rotating shaft 7 together, the outer side of the first rotating shaft 7 is fixedly connected with a first bevel gear 71, the middle part of the first rotating shaft 7 is provided with a first thread section, the outer side of the first thread section is connected with a sleeve 72, one side of the sleeve 72 is fixedly connected with a connecting block 73, one side of the inner wall of the driving cavity 13 is provided with a first avoiding groove, the connecting block 73 passes through the first avoiding groove and is slidably connected with the first avoiding groove, the connecting block 73 is fixedly connected with the placing box 2, the supporting plate 132 is fixedly connected in the driving cavity 13, the second rotating shaft 8 is rotatably connected in the middle of the supporting plate 132, the second bevel gear 81 is fixedly connected at both ends of the second rotating shaft 8, the third bevel gear 511 is fixedly connected at the outer side of the first rotating pipe 51, the first bevel gear 71 is meshed with the second bevel gear 81, the third bevel gear 511 is meshed with the second bevel gear 81, when the first rotating pipe 51 rotates, the first rotating pipe 51 drives the third bevel gear 511 to rotate together, the third bevel gear 511 drives the second bevel gear 81 to rotate, the second bevel gear 81 drives the second rotating shaft 8 to rotate in the supporting plate 132, so that the other second bevel gear 81 at the other side of the second rotating shaft 8 rotates together, the second bevel gear 81 at the other side drives the first bevel gear 71 to rotate together, and the first bevel gear 71 drives the first rotating shaft 7 to rotate together, because connecting block 73 sets up at the first inslot of dodging and with the first groove sliding connection of dodging, the first groove of dodging produces spacing effect to connecting block 73, thereby it is rotatory to make sleeve 72 can't follow first pivot 7, but move on the first screw thread section in the first pivot 7 outside with the mode of screw precession, when sleeve 72 moves on first screw thread section, drive connecting block 73 and slide in the first inslot of dodging, connecting block 73 drives again and places box 2 and remove in spout 11, thereby will place box 2 and release or withdraw spout 11, the person of facilitating the use puts into placing box 2 with books 25, avoid cutting the finger and take place the incident, the security of equipment has been improved.

Base 1's upside fixedly connected with protecting box 6, the inner wall fixedly connected with fixed plate 61 of protecting box 6, second rotating tube 52 rotates with fixed plate 61 to be connected, the upside of second rotating tube 52 rotates with the inner wall upside of protecting box 6 to be connected, the outside fixedly connected with second belt pulley 521 of second rotating tube 52, second belt pulley 521 corresponds the setting with first belt pulley 31, first belt pulley 31 has the belt with the outside cover of second belt pulley 521, one side of protecting box 6 is equipped with the second and dodges the groove, the second dodges the groove and is used for letting the belt pass through, when second rotating tube 52 rotates, second rotating tube 52 just can drive second belt pulley 521 and rotate jointly, thereby make second belt pulley 521 drive first belt pulley 31 and rotate jointly through the belt.

The upper side of the protective box 6 is provided with a thread groove, the thread groove is internally threaded with a thread block 62, the thread block 62 is rotatably connected with the connecting pipe 5, a second spring 53 is fixedly connected between the end head of the main shaft of the motor 131 and the inner wall of the connecting pipe 5, the outer side of the main shaft of the motor 131 is fixedly connected with a plurality of first shaft keys, the inner wall of the connecting pipe 5 is provided with a plurality of first key grooves 54, the first shaft keys are correspondingly arranged and slidably connected with the first key grooves 54, the outer side of the connecting pipe 5 is fixedly connected with a plurality of second shaft keys 55, the inner wall of the first rotating pipe 51 is provided with a plurality of second key grooves, the inner wall of the second rotating pipe 52 is provided with a plurality of third key grooves, the second key grooves and the third key grooves are respectively arranged corresponding to the second shaft keys 55, the thread block 62 is in threaded connection with the thread groove in the initial state, the connecting pipe 5 is pressed down, at the moment, the first shaft key at the outer side of the main shaft of the motor 131 is matched with the first key grooves 54 of the inner wall of the connecting pipe 5, the second shaft key 55 at the outer side of the connecting pipe 5 is matched with the second keyway on the inner wall of the first rotating pipe 51, and the second spring 53 is compressed, when the motor 131 is started, the main shaft of the motor 131 drives the connecting pipe 5 to rotate together through the first shaft key and the first keyway 54, the connecting pipe 5 drives the first rotating pipe 51 to rotate together through the second shaft key 55 and the second keyway, the threaded block 62 is screwed out of the threaded groove by rotating the threaded block 62, at the moment, the second spring 53 extends to jack up the connecting pipe 5, so that the main shaft of the motor 131 slides on the inner wall of the connecting pipe 5, the first shaft key slides in the first keyway 54, the connecting pipe 5 moves upwards and drives the second shaft key 55 to move upwards, the length of the second shaft key 55 is far less than that of the first shaft key, the main shaft of the motor 131 is always in the connecting pipe 5, the first shaft key is also always in the first keyway 54, and the connecting pipe 5 is rotated by hand, make second shaft key 55 and third keyway phase-match, can make second shaft key 55 by ejecting second keyway and enter into the third keyway, when motor 131 starts, the main shaft of motor 131 drives connecting pipe 5 through first shaft key and first keyway 54 and rotates jointly, and connecting pipe 5 just can drive second rotating pipe 52 through second shaft key 55 and third keyway and rotate jointly.

One side of the pressing plate 4 is provided with four second threaded holes, the threaded pipes 42 are in threaded connection with the second threaded holes, positioning rods 421 are in sliding connection with the threaded pipes 42, sliding plates 422 are fixedly connected to the outer sides of the positioning rods 421, one side of the pressing plate 41 is provided with a buffer groove 411, the sliding plates 422 are in sliding connection with the inner wall of the buffer groove 411, third springs 423 are arranged between the threaded pipes 42 and the sliding plates 422, a buffer pad is fixedly connected to the lower side of the pressing plate 4, a matching groove is arranged on the lower side of the pressing plate 4 and is matched with the end head of the lower side of the positioning rods 421, when the pressing plate 4 moves downwards to press and fix books 25, the four positioning rods 421 fix four corners of the books 25 firstly, the positioning rods 421 are made of elastic rubber materials, anti-skid lines are carved on the ground of the end head on the lower side of the positioning rods 421, the friction force between the end head of the lower side of the positioning rods 421 and the books 25 can be increased, and the pressing plate 4 continues to move downwards, books 25 withstand locating lever 421, make slide 422 in the locating lever 421 outside slide in buffer slot 411, and compress third spring 423, enter into the matching inslot until the downside end of locating lever 421, books 25 are pressed on to the blotter of 4 belows of clamp plate is whole, the realization is fixed to books 25's extrusion, four locating levers 421 can be fixed four angles of books 25 better under third spring 423's effect, improve the fixed effect to books 25, through rotating threaded pipe 42, can further change the deformation volume of third spring 423, thereby reach the effect that changes third spring 423 elasticity.

When the device is used, the motor 131 is started first, the motor 131 drives the connecting pipe 5 to rotate, the connecting pipe 5 drives the first rotating pipe 51 to rotate together through the second shaft key 55 and the second key slot, at this time, the second rotating pipe 52 does not rotate, the first rotating pipe 51 drives the third bevel gear 511 to rotate together, the third bevel gear 511 drives the second bevel gear 81 and the second rotating shaft 8 to rotate, so that the other second bevel gear 81 on the other side of the second rotating shaft 8 rotates together, the second bevel gear 81 on the other side drives the first bevel gear 71 and the first rotating shaft 7 to rotate together, so that the sleeve 72 moves in a threaded precession manner and drives the connecting block 73 to slide in the first avoiding groove, the connecting block 73 drives the placing box 2 to move in the sliding groove 11, thereby pushing the placing box 2 out of the sliding groove 11, facilitating a user to place a book 25 into the placing box 2, and reversely rotating the motor 131 after the placing is completed, the placing box 2 is retracted, the thread block 62 is screwed out from the thread groove, at this time, the second spring 53 is extended to jack up the connecting pipe 5, the main shaft of the motor 131 is always in the connecting pipe 5, the first shaft key is also always in the first key groove 54, the second shaft key 55 is pushed out of the second key groove and enters the third key groove, when the motor 131 is started, the main shaft of the motor 131 drives the connecting pipe 5 to rotate together through the first shaft key and the first key groove 54, the connecting pipe 5 can drive the second rotating pipe 52 to rotate together through the second shaft key 55 and the third key groove, the second rotating pipe 52 drives the second belt wheel 521 to rotate together, the second belt wheel 521 drives the first belt wheel 31 to rotate through a belt, the first belt wheel 31 can drive the fixing ring 33 to rotate together in the sinking groove, so that the screw rod 32 moves downwards along the first thread hole in a thread screwing mode, the screw rod 32 drives the pressing plate 4 to move downwards together along the supporting column 12, the pressing plate 4 drives the pressing block 41 to move together, so that books 25 with different heights can be extruded and fixed, and cutting is facilitated.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a trilateral book trimmer book pressing structure that need not to adjust, includes base (1), its characterized in that: one side of the base (1) is provided with a sliding groove (11), the sliding groove (11) is connected with a placing box (2) in a sliding manner, the upper side of the base (1) is provided with two support columns (12), the upper side of each support column (12) is fixedly connected with a top plate (3), the upper side of each top plate (3) is provided with a first belt pulley (31), the middle part of each first belt pulley (31) is provided with a screw rod (32), the lower side of each screw rod (32) is fixedly connected with a pressing plate (4), the lower side of each pressing plate (4) is fixedly connected with a pressing block (41), a driving cavity (13) is arranged inside the base (1), the bottom of each driving cavity (13) is fixedly connected with a motor (131), the outer side of a main shaft of the motor (131) is connected with a connecting pipe (5) in a sliding manner, the outer side of the connecting pipe (5) is provided with a first rotating pipe (51) and a second rotating pipe (52), the upside fixedly connected with guard box (6) of base (1), the inner wall fixedly connected with fixed plate (61) of guard box (6), second rotating tube (52) rotate with fixed plate (61) and are connected, the outside fixedly connected with second belt pulley (521) of second rotating tube (52), second belt pulley (521) correspond the setting with first belt pulley (31), the outside cover of first belt pulley (31) and second belt pulley (521) has the belt.

2. The structure of claim 1, wherein the three-side book trimmer is arranged to press a book on the three-side book trimmer: the tank bottom of spout (11) is equipped with two recess (111), place two gyro wheels (21) of downside fixedly connected with of box (2), gyro wheel (21) correspond the setting with recess (111), inner wall one side of spout (11) is equipped with two constant head tanks, place two location strip (22) of one side fixedly connected with of box (2), location strip (22) correspond with the constant head tank and set up and sliding connection.

3. The no-adjustment book pressing structure of the three-side book trimming machine according to claim 2, characterized in that: the inner wall both sides of placing box (2) all are equipped with fixed chamber (23) of a plurality of, sliding connection has fixed plate (231) in fixed chamber (23), first spring (232) of fixedly connected with between the inner wall of fixed plate (231) and fixed chamber (23), the opposite side fixedly connected with extension rod (233) of fixed plate (231), extension rod (233) pass fixed chamber (23) and fixedly connected with splint (24).

4. The no-adjustment book pressing structure of the three-side book trimming machine according to claim 2, characterized in that: the inner wall both sides of drive chamber (13) are rotated jointly and are connected with first pivot (7), the first bevel gear of outside fixedly connected with (71) of first pivot (7), the middle part of first pivot (7) is equipped with first screw thread section, the outside threaded connection of first screw thread section has sleeve (72), one side fixedly connected with connecting block (73) of sleeve (72), inner wall one side of drive chamber (13) is equipped with the first groove of dodging, connecting block (73) pass the first groove of dodging and dodge groove sliding connection with the first, connecting block (73) with place box (2) fixed connection.

5. The structure of claim 4, wherein the three-side book trimmer is arranged to press the book on the book block without adjustment, and comprises: fixedly connected with backup pad (132) in drive chamber (13), the middle part of backup pad (132) is rotated and is connected with second pivot (8), the equal fixedly connected with second bevel gear (81) in both ends of second pivot (8), first rotation pipe (51) pass the upside in drive chamber (13) and rotate with base (1) and be connected, the outside fixedly connected with third bevel gear (511) of first rotation pipe (51), first bevel gear (71) and second bevel gear (81) mesh mutually, third bevel gear (511) and second bevel gear (81) mesh mutually.

6. The structure of claim 1, wherein the three-side book trimmer is arranged to press a book on the three-side book trimmer: fixedly connected with second spring (53) between the main shaft end of motor (131) and the inner wall of connecting pipe (5), the first axle key of the outside fixedly connected with a plurality of motor (131) main shaft, the inner wall of connecting pipe (5) is equipped with first keyway (54) of a plurality of, first axle key corresponds setting and sliding connection with first keyway (54).

7. The structure of claim 6, wherein the three-side book trimmer is arranged to press the book on the book block without adjustment, and comprises: the outside fixedly connected with a plurality of second shaft key (55) of connecting pipe (5), the inner wall of first rotating pipe (51) is equipped with a plurality of second keyway, the inner wall of second rotating pipe (52) is equipped with a plurality of third keyway, second keyway and third keyway all correspond the setting with second shaft key (55), the upside of second rotating pipe (52) rotates with the inner wall upside of protective housing (6) to be connected, the upside of protective housing (6) is equipped with the thread groove, thread groove female connection has thread piece (62), thread piece (62) rotate with connecting pipe (5) to be connected.

8. The structure of claim 1, wherein the three-side book trimmer is arranged to press a book on the three-side book trimmer: the upside of roof (3) is equipped with heavy groove, heavy inslot internal rotation is connected with solid fixed ring (33), gu fixed ring (33) and first belt pulley (31) fixed connection, the middle part of first belt pulley (31) is equipped with first screw hole, screw rod (32) and first screw hole threaded connection.

9. The structure of claim 1, wherein the three-side book trimmer is arranged to press a book on the three-side book trimmer: one side of clamp plate (4) is equipped with four second screw holes, second screw hole female connection has screwed pipe (42), sliding connection has locating lever (421) in screwed pipe (42), outside fixedly connected with slide (422) of locating lever (421), one side of clamp plate (41) is equipped with dashpot (411), the inner wall sliding connection of slide (422) and dashpot (411), be equipped with third spring (423) between screwed pipe (42) and slide (422).