Adhesive binding device for book

Abstract

The utility model discloses an adhesive binding device for books, and relates to the field of book binding, the adhesive binding device comprises a working platform, the top of the working platform is fixedly connected with a placing frame, the side wall of the working platform is fixedly connected with a supporting piece, the top of the supporting piece is fixedly connected with an air cylinder, and the top of the working platform is provided with a uniform smearing mechanism; by means of the structural arrangement, the perfect binding device for the books can drive the vertical limiting plate to horizontally move through the air cylinder, so that the vertical limiting plate drives the first lead screw to horizontally move, the first lead screw rotates, and therefore the reciprocating sliding block is driven to vertically move while horizontally moving; and therefore, the reciprocating sliding block is in a wavy linear motion route, and the spine is evenly coated with glue.

Description

Technical Field

[0001] This application relates to the field of book binding, and particularly to a perfect binding device for books. Background Art

[0002] The perfect binding device for books is mainly used to bond the pages together with glue to form a complete book. The following is some basic information and working principles of such a device.

[0003] For example, a glue loading device for a perfect binding machine disclosed in the patent No. CN220904484U includes a mounting frame plate and a horizontal chute. The horizontal chute is opened at the top of the mounting frame plate. A horizontal plate is fixedly installed on the inner side wall of the mounting frame plate. The book is conveyed to the upper part of the device through a conveyable device. Then, the electric push rod is opened to push the guide plate, and the support rod slides horizontally. The slider inside the inner chute first generates a certain slide under the cooperation of the fitting head and the elliptical groove, and then drives the support rod to gradually rise while moving horizontally. The glue in the glue application groove is used to apply glue to the book. However, there are still the following deficiencies in actual use:

[0004] When the glue loading device of the above patent is actually used, the design of the glue application groove fails to consider the viscosity and fluidity of the glue, resulting in problems such as concentrated application or delayed outflow of the glue, which may cause uneven glue coating or blockage. The design of the guide plate may cause deviation when the support rod slides horizontally, thus affecting the uniform coating of the glue at the book spine. Summary of the Utility Model

[0005] In order to improve the problem of uneven glue coating surface, this application provides a perfect binding device for books.

[0006] The perfect binding device for books provided by this application adopts the following technical solutions:

[0007] A perfect binding device for books includes a working platform. A placement rack is fixedly connected to the top of the working platform. A support member is fixedly connected to the side wall of the working platform. A cylinder is fixedly connected to the top of the support member. A uniform coating mechanism is arranged on the top of the working platform;

[0008] The uniform coating mechanism includes a reciprocating sliding block slidably arranged on the top of the working platform. A glue spraying head is fixedly arranged on the side wall of the reciprocating sliding block. A first lead screw is arranged on the top of the reciprocating sliding block. A bottom limiting plate is slidably arranged on the side wall of the first lead screw. A connecting sliding block is fixedly arranged on the side wall of the bottom limiting plate. A second lead screw is rotatably arranged on one side of the connecting sliding block.

[0009] By adopting the above technical solutions, a port is arranged at the top of the glue spraying head and connected to the glue pipeline, facilitating the glue coating process.

[0010] Preferably, the uniform coating mechanism further includes a telescopic connecting plate fixedly connected to the telescopic end of the cylinder. A vertical limiting plate is fixedly connected to the side wall of the telescopic connecting plate. A sliding limiting plate fixedly connected to the top of the working platform is slidably arranged on the bottom side wall of the vertical limiting plate. The reciprocating sliding block is slidably arranged on the side wall of the vertical limiting plate. One side of the reciprocating sliding block is fixedly connected to the glue spraying head. The first screw rod threadedly penetrates through the top of the reciprocating sliding block. Rotating round covers are fixedly connected to both ends of the first screw rod. An insertion block is slidably connected to the inner wall of the rotating round cover. One end of the insertion block away from the inner wall of the rotating round cover is fixedly connected to a connecting cylinder that movably penetrates through the outer wall of the first screw rod. A gear is fixedly connected to the bottom of the connecting cylinder. A top limiting plate that fits against the top of the gear is movably penetrated through the side wall of the connecting cylinder. The bottom limiting plate movably penetrates through the side wall of the first screw rod.

[0011] By adopting the above technical solution, the gear is located between the top limiting plate and the bottom limiting plate, so that the gear is limited by the bottom limiting plate and the top limiting plate.

[0012] Preferably, a vertical connecting plate fixedly connected to the side wall of the bottom limiting plate is fixedly connected to the side wall of the top limiting plate. A rack that fits against the bottom of the top limiting plate is meshed with the side wall of the gear. A vertical connecting plate is fixedly connected to the side of the rack away from the gear.

[0013] By adopting the above technical solution, the vertical movement of the gear will not drive the first screw rod to move vertically synchronously, so that the structure operates more reasonably.

[0014] Preferably, the bottom of the rack fits against the top of the bottom limiting plate. A supporting vertical plate fixedly connected to the top of the working platform is arranged on the side of the vertical connecting plate away from the top limiting plate.

[0015] By adopting the above technical solution, the supporting vertical plate is vertically arranged with the top of the working platform, so that the structure operates more stably.

[0016] Preferably, the connecting sliding block movably penetrates through the side wall of the supporting vertical plate. The connecting sliding block is fixedly connected to the side of the vertical connecting plate close to the supporting vertical plate. A limiting block is fixedly connected to the end of the connecting sliding block away from the vertical connecting plate.

[0017] By adopting the above technical solution, the limiting block is larger than the cross section of the connecting sliding block, so as to limit the horizontal movement of the connecting sliding block.

[0018] Preferably, a first T-shaped shaft is fixedly connected to the side wall of the limiting block. A connecting rod movably penetrates through the outer wall of the first T-shaped shaft. The other side of the connecting rod away from the first T-shaped shaft movably penetrates through a second T-shaped shaft.

[0019] By adopting the above technical solution, the L-shaped arrangement of the second T-shaped shaft and the first T-shaped shaft enables the connecting rod to be always rotationally connected to the first T-shaped shaft and the second T-shaped shaft, thus making the structure operate more stably.

[0020] Preferably, one end of the second T-shaped shaft is fixedly connected with a connecting square block that fits against the side wall of the supporting vertical plate, and the side wall of the connecting square block is fixedly connected with an adjusting block that fits against the side wall of the supporting vertical plate.

[0021] By adopting the above technical solution, the connecting square blocks are arranged symmetrically horizontally, so that the connecting rods on both sides can be driven to operate simultaneously.

[0022] Preferably, the second lead screw threadedly penetrates through the side wall of the adjusting block, one end side wall of the second lead screw movably penetrates through a limiting member fixedly connected to the side wall of the supporting vertical plate, and one end of the second lead screw is fixedly connected with a knob.

[0023] By adopting the above technical solution, the outer wall of the second lead screw at the rotational connection with the limiting member is set to be a smooth surface, making the rotation process more reasonable.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. The air cylinder is used to drive the vertical limiting plate to move horizontally, so that the vertical limiting plate drives the first lead screw to move horizontally. The first lead screw will rotate, driving the reciprocating sliding block to move vertically while moving horizontally, so that the reciprocating sliding block moves along a wavy line, thus evenly applying glue to the spine.

[0026] 2. By turning the knob to drive the second lead screw to rotate, the second lead screw drives the adjusting block to move horizontally, driving the vertical connecting plate to move vertically, thus increasing the distance between the bottom limiting plates at the upper and lower ends, increasing the vertical movement distance of the reciprocating sliding block, increasing the vertical movement amplitude of the reciprocating sliding block. When the thickness of the spine to be glued needs to be increased, the mechanism can be adjusted synchronously, making the device more flexible and having a wider application range. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an overall structure display diagram of the booklet gluing device of this application;

[0028] Figure 2 It is a partial display diagram of the first lead screw of the booklet gluing device of this application;

[0029] Figure 3 It is a partial display diagram of the telescopic connecting plate of the booklet gluing device of this application;

[0030] Figure 4It is a side sectional view of the first lead screw of the bookbinding device for this application booklet;

[0031] Figure 5 It is a bookbinding device for this application booklet Figure 4 A partial view of the A position in;

[0032] Figure 6 It is a partial view of the second lead screw of the bookbinding device for this application booklet;

[0033] Figure 7 It is a partial view of the adjusting block of the bookbinding device for this application booklet.

[0034] Reference numerals:

[0035] 1. Working platform; 11. Placing rack; 12. Support member; 13. Cylinder;

[0036] 2. Uniform coating mechanism; 21. Telescopic connecting plate; 22. Vertical limiting plate; 23. Sliding limiting plate; 24. Reciprocating sliding block; 25. First lead screw; 26. Rotating round cover; 27. Insert block; 28. Connecting cylinder; 29. Gear; 210. Top limiting plate; 211. Bottom limiting plate; 212. Vertical connecting plate; 213. Rack; 214. Support vertical plate;

[0037] 215. Connecting sliding block; 216. Limiting block; 217. First T-shaped shaft; 218. Connecting rod; 219. Second T-shaped shaft; 220. Connecting square block; 221. Adjusting block; 222. Second lead screw; 223. Limiting member; 224. Knob;

[0038] 3. Glue spraying head. Detailed implementation manners

[0039] The following is a further detailed description of this application in conjunction with the attached Figures 1-7 figures.

[0040] The embodiment of this application discloses a bookbinding device for booklets.

[0041] Referring to Figure 1 , a bookbinding device for booklets includes a working platform 1, a placing rack 11 is fixedly connected to the top of the working platform 1, a support member 12 is fixedly connected to the side wall of the working platform 1, a cylinder 13 is fixedly connected to the top of the support member 12, and a uniform coating mechanism 2 is arranged on the top of the working platform 1.

[0042] The staff places the booklet on the top of the placing rack 11, with the spine side facing the glue spraying head 3, so as to facilitate the next glue coating process, and then the staff starts the cylinder 13.

[0043] Referring to Figure 2 , Figure 3, the uniform coating mechanism 2 includes a reciprocating slider 24 slidably arranged on the top of the working platform 1. The glue spraying head 3 is fixedly arranged on the side wall of the reciprocating slider 24. The first lead screw 25 is arranged on the top of the reciprocating slider 24. The bottom limiting plate 211 is slidably arranged on the side wall of the first lead screw 25. The connecting slider 215 is fixedly arranged on the side wall of the bottom limiting plate 211. The second lead screw 222 is rotatably arranged on one side of the connecting slider 215. The uniform coating mechanism 2 further includes a telescopic connecting plate 21 fixedly connected to the telescopic end of the cylinder 13. The vertical limiting plate 22 is fixedly connected to the side wall of the telescopic connecting plate 21. The two sides of the bottom of the vertical limiting plate 22 are in contact with the side wall of the sliding limiting plate 23, so that the vertical limiting plate 22 is slidably limited by the sliding limiting plate 23. The bottom of the sliding limiting plate 23 is fixedly connected to the top of the working platform 1. A through chute one is vertically opened on the side wall of the vertical limiting plate 22. The reciprocating slider 24 movably penetrates through the chute one, so that the reciprocating slider 24 is slidably connected to the vertical limiting plate 22. The glue spraying head 3 is fixedly connected to one side of the reciprocating slider 24, so that the reciprocating slider 24 can drive the glue spraying head 3 to move synchronously. A threaded hole one is penetrated through the top of the reciprocating slider 24. The first lead screw 25 is threadedly penetrated through the threaded hole one, so that the first lead screw 25 is threadedly connected to the reciprocating slider 24.

[0044] When the cylinder 13 is started, the telescopic end of the cylinder 13 will horizontally extend. The telescopic end of the cylinder 13 will drive the telescopic connecting plate 21 to move horizontally. The telescopic connecting plate 21 will drive the vertical limiting plate 22 to move horizontally. The vertical limiting plate 22 will drive the reciprocating slider 24 to slide horizontally. The reciprocating slider 24 will drive the first lead screw 25 to move synchronously. The first lead screw 25 will drive the rotating round cover 26 to move synchronously. The rotating round cover 26 will drive the connecting cylinder 28 to move synchronously through the inserting block 27. The connecting cylinder 28 will drive the gear 29 to move synchronously. At this time, the gear 29 will be restricted by the meshing connection of the rack 213. The rack 213 will cause the gear 29 to rotate while moving horizontally along with the first lead screw 25.

[0045] Refer to Figure 3 , Figure 4, both ends of the first lead screw 25 are fixedly connected to the top inner wall of the rotating circular cover 26. A non-through second chute is provided on the inner wall of the rotating circular cover 26. The insertion block 27 is slidably connected to the second chute, so that the insertion block 27 is slidably connected to the rotating circular cover 26. One end of the insertion block 27 away from the inner wall of the rotating circular cover 26 is fixedly connected to the outer wall of the connecting cylinder 28. A first circular hole is provided through the top of the connecting cylinder 28. The diameter of the first circular hole is larger than the cross-sectional diameter of the first lead screw 25, so that the first lead screw 25 movably penetrates through the first circular hole. Thus, when the connecting cylinder 28 moves vertically, it will not interfere with the rotation of the first lead screw 25. The bottom of the connecting cylinder 28 is fixedly connected to the top of the gear 29, so that when the gear 29 rotates, it will drive the connecting cylinder 28 to rotate. A third chute is provided through the top of the top limiting plate 210. The side wall of the connecting cylinder 28 movably penetrates through the third chute, so that the connecting cylinder 28 is slidably connected to the top limiting plate 210. The bottom of the top limiting plate 210 is in contact with the top of the gear 29, so as to limit the gear 29 through the top limiting plate 210.

[0046] The gear 29 will drive the connecting cylinder 28 to rotate. The connecting cylinder 28 will drive the rotating circular cover 26 to rotate through the insertion block 27. The rotating circular cover 26 will drive the first lead screw 25 to rotate. The first lead screw 25 will drive the reciprocating sliding block 24 to move vertically in a reciprocating manner. The reciprocating sliding block 24 will drive the glue spraying head 3 to move vertically in a reciprocating manner, so as to drive the glue spraying head 3 to move up and down in a reciprocating manner while moving horizontally, so that the glue application on the spine of the book is in a wavy shape. Thus, the glue at the spine of the book is applied in a uniform state.

[0047] Refer to Figure 4 、 Figure 5 , a fourth chute is provided through the top of the bottom limiting plate 211. The side wall of the first lead screw 25 movably penetrates through the fourth chute, so that the first lead screw 25 can slide and rotate simultaneously inside the inner wall of the bottom limiting plate 211. The side wall of the top limiting plate 210 is fixedly connected to the side wall of the vertical connecting plate 212. The side wall of the vertical connecting plate 212 is fixedly connected to the side wall of the bottom limiting plate 211. The teeth on the side wall of the gear 29 are meshed with the teeth on the side of the rack 213 close to the gear 29. The top of the rack 213 is in contact with the bottom of the top limiting plate 210. The bottom of the rack 213 is in contact with the top of the bottom limiting plate 211. The side of the rack 213 away from the gear 29 is fixedly connected to the vertical connecting plate 212. The side of the vertical connecting plate 212 away from the top limiting plate 210 is in contact with the side of the supporting vertical plate 214 close to the rack 213. The bottom of the supporting vertical plate 214 is fixedly connected to the top of the working platform 1, so as to fix the supporting vertical plate 214 through the working platform 1. A fifth vertical chute is provided through the side wall of the supporting vertical plate 214. The connecting sliding block 215 movably penetrates through the fifth chute, so that the connecting sliding block 215 is slidably connected to the supporting vertical plate 214.

[0048] When the thickness of the book is relatively large, the staff rotates the knob 224. At this time, the knob 224 will drive the second lead screw 222 to rotate. When the second lead screw 222 rotates, it will drive the adjusting block 221 to move horizontally. The adjusting block 221 will drive the connecting square block 220 to move horizontally. When the connecting square block 220 moves horizontally, it will drive the connecting rod 218 to rotate. The connecting rod 218 will drive the limiting block 216 to move vertically through the first T-shaped shaft 217.

[0049] Refer to Figure 6 , Figure 7 , on the side of the vertical connecting plate 212 close to the supporting vertical plate 214, it is fixedly connected to one end of the connecting sliding block 215 close to the vertical connecting plate 212. Thus, the first lead screw 25 can drive the vertical connecting plate 212 to move vertically. The limiting block 216 is fixedly connected to the end of the connecting sliding block 215 away from the vertical connecting plate 212. Thus, the limiting block 216 can drive the connecting sliding block 215 to move vertically. The first T-shaped shaft 217 is fixedly connected to the side wall of the limiting block 216. A circular hole two is formed through the side of the connecting rod 218 close to the first T-shaped shaft 217. The outer wall of the first T-shaped shaft 217 movably penetrates through the circular hole two. Thus, the connecting rod 218 is rotatably connected to the first T-shaped shaft 217. A circular hole three is formed through the side of the connecting rod 218 away from the first T-shaped shaft 217. The second T-shaped shaft 219 movably penetrates through the circular hole three. Thus, the second T-shaped shaft 219 is rotatably connected to the connecting rod 218. One end of the second T-shaped shaft 219 is fixedly connected to the connecting square block 220. The side of the connecting square block 220 close to the supporting vertical plate 214 is attached to the side wall of the supporting vertical plate 214.

[0050] The limiting block 216 will drive the connecting sliding block 215 to move vertically synchronously. The connecting sliding block 215 will be vertically limited and slide by the supporting vertical plate 214. The connecting sliding block 215 will also drive the vertical connecting plate 212 to move vertically. The vertical connecting plate 212 will synchronously drive the rack 213, the top limiting plate 210, and the bottom limiting plate 211 to move vertically. The top limiting plate 210 and the bottom limiting plate 211 will drive the gear 29 to move vertically upward. The gear 29 will drive the connecting cylinder 28 to move vertically upward.

[0051] Refer to Figure 1, the adjusting block 221 is fixedly connected to the side wall of the connecting square block 220. One side of the adjusting block 221 close to the knob 224 is attached to the side wall of the supporting vertical plate 214. A second threaded hole is formed through the side wall of the adjusting block 221, and the second lead screw 222 is threadedly passed through the second threaded hole, so that the second lead screw 222 is threadedly connected to the adjusting block 221. Thus, when the second lead screw 222 rotates, it will drive the adjusting block 221 to move horizontally. A sixth round hole is formed through the side wall of the limiting member 223, and one end side wall of the second lead screw 222 is movably passed through the sixth round hole, so that the second lead screw 222 is rotatably connected to the limiting member 223. One side of the limiting member 223 close to the supporting vertical plate 214 is fixedly connected to the side wall of the supporting vertical plate 214. The knob 224 is fixedly connected to one end of the second lead screw 222.

[0052] The connecting cylinder 28 will slide inside the rotating round cover 26, thereby lengthening the sliding distance of the reciprocating sliding block 24 between the upper and lower bottom limiting plates 211, so that the vertical movement distance of the reciprocating sliding block 24 up and down increases, so that the reciprocating sliding block 24 can apply glue to the book spines of different thicknesses.

[0053] Among them, the air cylinder 13 and the glue spraying head 3 are both prior arts, and their structural principles will not be described in detail. It also includes a glue delivery pipe, a liquid pump, a power connection line, a power switch, etc., which are not the main technologies, so they will not be described in detail.

[0054] The implementation principle of the glue binding device for books in the embodiment of the present application is as follows:

[0055] When the air cylinder 13 is started, the telescopic end of the air cylinder 13 will drive the gear 29 to move synchronously. At this time, the gear 29 will be restricted by the meshing connection of the rack 213. The rack 213 will cause the gear 29 to rotate while moving horizontally along with the first lead screw 25. The gear 29 will drive the first lead screw 25 to rotate, and the first lead screw 25 will drive the glue spraying head 3 to reciprocate vertically, so as to drive the glue spraying head 3 to reciprocate up and down while moving horizontally. The staff rotates the knob 224. At this time, the knob 224 will drive the second lead screw 222 to rotate. When the second lead screw 222 rotates, it will drive the connecting square block 220 to move horizontally. When the connecting square block 220 moves horizontally, it will drive the connecting rod 218 to rotate. The connecting rod 218 will drive the connecting sliding block 215 to move vertically synchronously through the first T-shaped shaft 217. The connecting sliding block 215 will be vertically slidably limited by the supporting vertical plate 214. The connecting sliding block 215 will also drive the connecting cylinder 28 to move vertically upward. The connecting cylinder 28 will slide inside the rotating round cover 26, thereby lengthening the sliding distance of the reciprocating sliding block 24 between the upper and lower bottom limiting plates 211, so that the vertical movement distance of the reciprocating sliding block 24 up and down increases.

[0056] The above are only optional embodiments of the present disclosure and are not intended to limit the present disclosure. For those skilled in the art, various changes and modifications can be made to the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included within the protection scope of the present disclosure.

Claims

1. A perfect binding device for booklets, comprising a working platform (1), a placement rack (11) fixedly connected to the top of the working platform (1), a support member (12) fixedly connected to the side wall of the working platform (1), and a cylinder (13) fixedly connected to the top of the support member (12), characterized in that: A uniform coating mechanism (2) is provided on the top of the working platform (1); The uniform coating mechanism (2) includes a reciprocating sliding block (24) slidably arranged on the top of the working platform (1). A glue spraying head (3) is fixedly arranged on the side wall of the reciprocating sliding block (24). A first lead screw (25) is arranged on the top of the reciprocating sliding block (24). A bottom limiting plate (211) is slidably arranged on the side wall of the first lead screw (25). A connecting sliding block (215) is fixedly arranged on the side wall of the bottom limiting plate (211). A second lead screw (222) is rotatably arranged on one side of the connecting sliding block (215).

2. The perfect binding device for a booklet according to claim 1, characterized in that: The uniform coating mechanism (2) further includes a telescopic connecting plate (21) fixedly connected to the telescopic end of the air cylinder (13). A vertical limiting plate (22) is fixedly connected to the side wall of the telescopic connecting plate (21). A sliding limiting plate (23) fixedly connected to the top of the working platform (1) is slidably arranged on the bottom side wall of the vertical limiting plate (22). The reciprocating sliding block (24) is slidably arranged on the side wall of the vertical limiting plate (22). One side of the reciprocating sliding block (24) is fixedly connected to the glue spraying head (3). The first lead screw (25) threadedly penetrates through the top of the reciprocating sliding block (24). Rotating round covers (26) are fixedly connected to both ends of the first lead screw (25). An insertion block (27) is slidably connected to the inner wall of the rotating round cover (26). One end of the insertion block (27) away from the inner wall of the rotating round cover (26) is fixedly connected to a connecting cylinder (28) movably penetrating through the outer wall of the first lead screw (25). A gear (29) is fixedly connected to the bottom of the connecting cylinder (28). A top limiting plate (210) fitting with the top of the gear (29) is movably penetrated through the side wall of the connecting cylinder (28). The bottom limiting plate (211) movably penetrates through the side wall of the first lead screw (25).

3. The perfect binding device for a booklet according to claim 2, characterized in that: A vertical connecting plate (212) fixedly connected to the side wall of the top limiting plate (210) and fixedly connected to the side wall of the bottom limiting plate (211) is provided. A rack (213) fitting with the bottom of the top limiting plate (210) is meshed and connected to the side wall of the gear (29). A vertical connecting plate (212) is fixedly connected to one side of the rack (213) away from the gear (29).

4. A perfect binding device for a booklet according to claim 3, characterized in that: The bottom of the rack (213) fits with the top of the bottom limiting plate (211). A supporting vertical plate (214) fixedly connected to the top of the working platform (1) is arranged on one side of the vertical connecting plate (212) away from the top limiting plate (210).

5. The perfect binding device for a book according to claim 4, characterized in that: The connecting sliding block (215) movably penetrates through the side wall of the supporting vertical plate (214). The connecting sliding block (215) is fixedly connected to one side of the vertical connecting plate (212) close to the supporting vertical plate (214). A limiting block (216) is fixedly connected to one end of the connecting sliding block (215) away from the vertical connecting plate (212).

6. The perfect binding device for a booklet according to claim 5, wherein: A first T-shaped shaft (217) is fixedly connected to the side wall of the limiting block (216). A connecting rod (218) is movably penetrated through the outer wall of the first T-shaped shaft (217). A second T-shaped shaft (219) is movably penetrated through one side of the connecting rod (218) away from the first T-shaped shaft (217).

7. The perfect binding device for a booklet according to claim 6, characterized in that: One end of the second T-shaped shaft (219) is fixedly connected with a connecting square block (220) which fits against the side wall of the supporting vertical plate (214), and the side wall of the connecting square block (220) is fixedly connected with an adjusting block (221) which fits against the side wall of the supporting vertical plate (214).

8. A perfect binding device for a booklet according to claim 1, characterized in that: The second lead screw (222) threadedly penetrates through the side wall of the adjusting block (221), one end side wall of the second lead screw (222) movably penetrates through a limiting member (223) fixedly connected with the side wall of the supporting vertical plate (214), and one end of the second lead screw (222) is fixedly connected with a knob (224).

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