Laser cutting bed feeding device capable of achieving smooth distribution

By introducing a limit ring and adjustable scraping plate into the laser cutting bed feeding device, the problems of offset and skewness during the fabric distribution process are solved, and stable distribution and accurate cutting of the fabric are achieved.

CN222176382UActive Publication Date: 2024-12-17JIANGSU YANGZITUN GARMENT CO LTD
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Patent Information

Application Number
CN202420693120.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-07
Publication Date
2024-12-17
Estimated Expiration
2034-04-07

AI Technical Summary

Technical Problem

The existing distribution and leveling laser cutting bed feeding device fails to limit the two sides of the fabric, resulting in a skewed deviation during the distribution process, resulting in laser cutting dimensional errors and wrinkles when cutting the fabric.

Method used

A laser cutting bed feeding device including a distribution mechanism and a scraping mechanism is designed. By installing a limit ring and an adjustable scraping plate at both ends of the fabric rod, the limit ring blocks the two sides of the fabric and scrapes. Flat plates are used to smooth the surface of the fabric to avoid the appearance of wrinkles.

Benefits of technology

It effectively avoids the deviation and skew of the fabric during the distribution process, maintains the stable distribution and accurate cutting of the fabric, and prevents dimensional errors and wrinkles during laser cutting.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of laser cutting beds, in particular to a laser cutting bed feeding device with a flat distribution function, which comprises two bed bodies, transmission rollers rotatably mounted at two ends between the two bed bodies, a transmission belt sleeved on the surfaces of the two transmission rollers, and a cutting bottom plate fixed at the top end between the two bed bodies. A laser generation main body is mounted at the top end of the cutting bottom plate and located at the top ends of the two bed bodies; the distribution mechanism comprises a mounting plate; the device has the advantages that the two sides of the fabric can be conveniently limited and blocked when the fabric moves along with the conveying belt, the situation that the distributed fabric is wrinkled due to the fact that the fabric deviates and inclines when distributed towards the two sides is avoided, and it is kept that the fabric is stably and accurately distributed through the fabric rod; and the fabric moving along with the conveying belt can be conveniently strickled through the strickling plate, and the situation that the fabric is wrinkled on the surface of the conveying belt, and cutting of the fabric by the laser generation body is affected is avoided.
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Description

Technical Field

[0001] The utility model relates to the technical field of laser cutting machines, in particular to a feeding device for laser cutting machines with smooth distribution. Background Art

[0002] At present, in order to improve production efficiency and cutting quality, laser cutting machines have also been widely used in the field of clothing processing. Laser cutting machines use lasers to generate heat energy to cut fabrics. They are suitable for cutting more standard pieces of fabric, more complex special-shaped fabrics, and complex patterns on the same fabric.

[0003] Laser cutting is achieved by using high-power and high-density energy generated by laser focusing. Under computer control, the laser is discharged through pulses, thereby outputting controllable repetitive high-frequency pulsed lasers to form a light beam with a certain frequency and pulse width. The pulsed laser beam is transmitted and reflected through the optical path and focused on the surface of the processed object through a focusing lens group, forming a series of fine, high-energy density light spots. The focal spot is located near the surface to be processed, and the processed material is melted or vaporized at an instantaneous high temperature. The high-energy laser pulse instantly sputters a tiny hole on the surface of the object. Under computer control, the cutting head of the laser cutting machine and the processed material perform continuous relative motion and dotting according to a pre-drawn pattern, so that the object can be processed into the desired shape.

[0004] For example, the prior art Chinese patent publication number "CN220093453U" provides a laser cutting bed feeding device with smooth distribution, including a second frame arranged on one side of the first frame, a feeding grid arranged between the first frame and the second frame, a laser generating body arranged above the feeding grid, and the two ends of the laser generating body are respectively fixed to the upper surfaces of the first frame and the second frame; it also includes: a fabric rod, which is arranged above one end of the feeding grid, a left-rotating thread is arranged on the outside of one side at the center of the fabric rod, and a right-rotating thread is arranged on the other side at the center of the fabric rod; a first ball bearing, which is arranged at both ends of the fabric rod.

[0005] During the movement of the fabric, the device uses friction to drive the fabric rod to rotate. The fabric is pushed to the upper left and upper right along with the left-rotating thread and the right-rotating thread respectively. After the fabric is distributed, the slightly wrinkled areas are spread apart, thereby achieving smooth distribution of the fabric. There is no need for manual sorting by personnel, which saves time and effort. When the fabric is pushed forward, it is sucked firmly by the cutting table suction fan, and there will be no problems with the size of the cut pieces or the unevenness of the cut pieces.

[0006] In the existing laser cutting bed feeding device with smooth distribution, the fabric is distributed to both sides only by the fabric rod during the process of moving the fabric to the laser generating body, but the fabric on both sides is not limited and blocked, which will cause the fabric to be offset and skewed and wrinkled during the distribution process, and the size of the guided laser cutting will be incorrect. At the same time, after the fabric slides over the fabric rod, when wrinkles appear while moving on the conveyor belt, the fabric is not scraped flat, which will cause the wrinkles to be laser cut below the laser generating body, resulting in errors in the fabric cutting size. Utility Model Content

[0007] The purpose of the utility model is to solve the shortcomings of the prior art that the two sides of the fabric cannot be limited and blocked, which will cause the fabric to be offset, skewed and wrinkled during the distribution process to the two sides, and guide the error of the size of the laser cutting, and to propose a laser cutting bed feeding device with smooth distribution.

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] A feeding device for a laser cutting bed with smooth distribution is designed, comprising a bed body, a distribution mechanism and a scraping mechanism, transmission rollers are rotatably installed at both ends between the two bed bodies, and conveyor belts are sleeved on the surfaces of the two transmission rollers, a cutting base plate is fixed at the top end between the two bed bodies, a laser generating body is installed at the top end of the cutting base plate and at the top end of the two bed bodies, the distribution mechanism comprises a mounting plate, and the two mounting plates are respectively fixed at the top end of the two bed bodies, a fabric rod is rotatably installed between the two mounting plates, rotating threads are fixed on the surfaces of the middle and two ends of the fabric rod, a first mounting hole is opened on the surface of the mounting plate, and the first mounting hole A first mounting rod passes through the interior of the first mounting rod, a first nut is connected to the surface of the first mounting rod and located at both ends of the first mounting hole, a limiting ring is fixed to the inner end of the first mounting rod, and the scraping mechanism includes a mounting frame, a second mounting hole is opened at the top of the mounting frame, a second mounting rod passes through the interior of the second mounting hole, a second nut is connected to the surface of the second mounting rod and located at the upper and lower ends of the second mounting hole, a connecting plate is fixed to the bottom end of the second mounting rod, a connecting groove is opened in the middle of the connecting plate, a scraping plate is connected to the interior of the connection, connecting holes are opened on both sides of the bottom end of the connecting plate, and tightening bolts pass through the interior of the connecting holes.

[0010] Furthermore, the cutting bottom plate is a rectangular plate structure and is horizontally slidably arranged on the top of the conveyor belt, and the top of the conveyor belt is lower than the top of the bed.

[0011] Furthermore, the fabric rod is horizontally arranged at the top end of the conveyor belt and close to the transmission roller, and the limiting ring is sleeved on the outside of the rotating thread at intervals and without contact.

[0012] Furthermore, the first mounting rod is a threaded rod structure and is horizontally arranged on both sides of the fabric rod. The first mounting rod is slidably mounted and connected to the mounting plate through the first mounting hole.

[0013] Furthermore, the first mounting rod is detachably fastened and installed with the mounting plate through the first nut, and the limiting ring is a circular ring structure and is distributed at both ends of the fabric rod.

[0014] Furthermore, the mounting frame is a C-shaped structure, horizontally spans the top of the conveyor belt, and is located between the fabric rod and the laser generating body.

[0015] Furthermore, the second mounting rod is a threaded rod structure and is vertically arranged and connected to the mounting frame by sliding through the second mounting hole. The second mounting rod is detachably fastened and connected to the mounting frame by the second nut.

[0016] Furthermore, the connecting plate is a rectangular plate structure and is horizontally arranged, the connecting groove is a rectangular groove structure, the scraping plate is slidably and adjustably installed between the connecting groove and the connecting plate, the connecting hole is a threaded hole structure, and the inner end of the tightening bolt tightens the two sides of the scraping plate.

[0017] The utility model proposes a laser cutting bed feeding device with smooth distribution, which has the following beneficial effects:

[0018] 1. The utility model sleeves limiting rings at both ends of the fabric rod through the first mounting rod, spreads the fabric on the conveyor belt, and covers the surface of the fabric rod. The positions of the two limiting rings can be adjusted along the first mounting hole according to the width of the fabric, so as to limit and block the two sides of the fabric when the fabric moves with the conveyor belt, avoid the fabric from being offset and skewed when being distributed to both sides, and cause wrinkles in the distributed fabric, so as to keep the fabric stably and accurately distributed through the fabric rod.

[0019] 2. The utility model arranges a connecting plate and a scraping plate through an installation frame, and the connecting plate is detachably and adjustably connected to the installation frame through a second installation rod and a second nut, and the scraping plate is detachably and adjustably connected to the connecting plate through a connecting groove and a tightening bolt. In this way, the second installation rod can be moved up and down along the second installation hole to adjust the height of the connecting plate and the scraping plate, or the scraping plate can be moved up and down along the connecting groove to adjust the height of the scraping plate, so that the fabric moving with the conveyor belt can be scraped flat by the scraping plate to avoid wrinkles on the surface of the conveyor belt and affecting the cutting of the fabric by the laser generating body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 For this utility model Figure 1 Enlarged view of point C;

[0022] Figure 3 For this utility model Figure 1 A cross-sectional view of

[0023] Figure 4 For this utility model Figure 3 A magnified image of point A;

[0024] Figure 5 For this utility model Figure 3 Enlarged view of point B.

[0025] In the figure: 1. bed; 2. transmission roller; 3. transmission belt; 4. cutting bottom plate; 5. laser generating body; 6. mounting frame; 7. limiting ring; 8. mounting plate; 9. first mounting rod; 10. first mounting hole; 11. first nut; 12. rotating thread; 13. material rod; 14. second mounting hole; 15. second nut; 16. second mounting rod; 17. connecting plate; 18. scraping plate; 19. tightening bolt; 20. connecting hole; 21. connecting groove. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0027] Example 1

[0028] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5The figure shows a feeding device for a laser cutting bed with smooth distribution, which includes a bed body 1, a distribution mechanism and a scraping mechanism. Transmission rollers 2 are rotatably installed at both ends between the two beds 1, and a conveyor belt 3 is sleeved on the surface of the two transmission rollers 2. A cutting base plate 4 is fixed at the top between the two beds 1, and a laser generating body 5 is installed at the top of the cutting base plate 4 and at the top of the two beds 1. The distribution mechanism includes a mounting plate 8, and the two mounting plates 8 are respectively fixed at the tops of the two beds 1. A fabric rod 13 is rotatably installed between the two mounting plates 8, and the surfaces of the middle ends of the fabric rod 13 are A rotating thread 12 is fixed on each surface, and the rotating thread 12 includes a left-rotating thread and a right-rotating thread. The left-rotating thread is arranged on the outside of one side of the center of the fabric rod 13, and the right-rotating thread is arranged on the outside of the other side of the center of the fabric rod 13. A first mounting hole 10 is opened on the surface of the mounting plate 8, and a first mounting rod 9 passes through the inside of the first mounting hole 10. First nuts 11 are connected to the surface of the first mounting rod 9 and at both ends of the first mounting hole 10. A limiting ring 7 is fixed on the inner end of the first mounting rod 9. The limiting ring 7 limits and blocks both sides of the fabric to prevent the fabric from being offset and skewed during distribution.

[0029] The fabric is spread on the conveyor belt 3 and covered on the surface of the fabric rod 13. The positions of the two limiting rings 7 can be adjusted along the first mounting hole 10 according to the width of the fabric, so as to limit and block the two sides of the fabric when the fabric moves along the conveyor belt 3, to avoid the fabric from being offset and skewed when being distributed to both sides, which may cause wrinkles in the distributed fabric, and to keep the fabric distributed stably and accurately through the fabric rod 13.

[0030] The scraping mechanism includes a mounting frame 6, a second mounting hole 14 is formed at the top of the mounting frame 6, a second mounting rod 16 passes through the inside of the second mounting hole 14, second nuts 15 are connected to the surface of the second mounting rod 16 and located at the upper and lower ends of the second mounting hole 14, a connecting plate 17 is fixed to the bottom end of the second mounting rod 16, a connecting groove 21 is formed in the middle of the connecting plate 17, a scraping plate 18 is connected to the inside of the connecting groove 21, connecting holes 20 are formed on both sides of the bottom end of the connecting plate 17, tightening bolts 19 pass through the inside of the connecting holes 20, and the height of the scraping plate 18 can be adjusted to facilitate scraping of wrinkled fabrics.

[0031] According to the thickness of the fabric, the second mounting rod 16 can be moved up and down along the second mounting hole 14 to adjust the height of the connecting plate 17 and the scraping plate 18, or the scraping plate 18 can be moved up and down along the connecting groove 21 to adjust the height of the scraping plate 18, so that the fabric moving with the conveyor belt can be scraped flat by the scraping plate 18 to avoid wrinkles on the surface of the conveyor belt 3 and affect the cutting of the fabric by the laser generating body 5.

[0032] The cutting base plate 4 is a rectangular plate structure and is horizontally slidably arranged at the top of the conveyor belt 3, and the top of the conveyor belt 3 is lower than the top of the bed 1; the fabric rod 13 is horizontally arranged at the top of the conveyor belt 3 and close to the transmission roller 2, and the limiting ring 7 is spaced and non-contactly sleeved on the outside of the rotating thread 12.

[0033] The first mounting rod 9 is a threaded rod structure and is horizontally arranged on both sides of the fabric rod 13. The first mounting rod 9 is slidably installed and connected to the mounting plate 8 through the first mounting hole 10; the first mounting rod 9 is detachably fastened and installed to the mounting plate 8 through the first nut 11, and the limiting ring 7 is a circular ring structure and is distributed at both ends of the fabric rod 13.

[0034] The mounting frame 6 is a C-shaped structure and horizontally spans the top of the conveyor belt 3 and is located between the fabric rod 13 and the laser generating body 5; the second mounting rod 16 is a threaded rod structure and is vertically arranged and connected to the mounting frame 6 by sliding through the second mounting hole 14, and the second mounting rod 16 is connected to the mounting frame 6 by detachable fastening through the second nut 15.

[0035] The connecting plate 17 is a rectangular plate structure and is arranged horizontally. The connecting groove 21 is a rectangular groove structure. The scraping plate 18 can be slidably and adjustably installed between the connecting groove 21 and the connecting plate 17. The connecting hole 20 is a threaded hole structure. The inner end of the tightening bolt 19 tightens the two sides of the scraping plate 18.

[0036] Example 2

[0037] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5The figure shows a feeding device for a laser cutting bed with smooth distribution, which includes a bed body 1, a distribution mechanism and a scraping mechanism. Transmission rollers 2 are rotatably installed at both ends between the two beds 1, and a conveyor belt 3 is sleeved on the surface of the two transmission rollers 2. A cutting base plate 4 is fixed at the top between the two beds 1, and a laser generating body 5 is installed at the top of the cutting base plate 4 and at the top of the two beds 1. The distribution mechanism includes a mounting plate 8, and the two mounting plates 8 are respectively fixed at the tops of the two beds 1. A fabric rod 13 is rotatably installed between the two mounting plates 8, and the surfaces of the middle ends of the fabric rod 13 are A rotating thread 12 is fixed on each surface, and the rotating thread 12 includes a left-rotating thread and a right-rotating thread. The left-rotating thread is arranged on the outside of one side of the center of the fabric rod 13, and the right-rotating thread is arranged on the outside of the other side of the center of the fabric rod 13. A first mounting hole 10 is opened on the surface of the mounting plate 8, and a first mounting rod 9 passes through the inside of the first mounting hole 10. First nuts 11 are connected to the surface of the first mounting rod 9 and at both ends of the first mounting hole 10. A limiting ring 7 is fixed on the inner end of the first mounting rod 9. The limiting ring 7 limits and blocks both sides of the fabric to prevent the fabric from being offset and skewed during distribution.

[0038] The fabric is spread on the conveyor belt 3 and covered on the surface of the fabric rod 13. The positions of the two limiting rings 7 can be adjusted along the first mounting hole 10 according to the width of the fabric, so as to limit and block the two sides of the fabric when the fabric moves along the conveyor belt 3, to avoid the fabric from being offset and skewed when being distributed to both sides, which may cause wrinkles in the distributed fabric, and to keep the fabric distributed stably and accurately through the fabric rod 13.

[0039] The scraping mechanism includes a mounting frame 6, a second mounting hole 14 is formed at the top of the mounting frame 6, a second mounting rod 16 passes through the inside of the second mounting hole 14, second nuts 15 are connected to the surface of the second mounting rod 16 and located at the upper and lower ends of the second mounting hole 14, a connecting plate 17 is fixed to the bottom end of the second mounting rod 16, a connecting groove 21 is formed in the middle of the connecting plate 17, a scraping plate 18 is connected to the inside of the connecting groove 21, connecting holes 20 are formed on both sides of the bottom end of the connecting plate 17, tightening bolts 19 pass through the inside of the connecting holes 20, and the height of the scraping plate 18 can be adjusted to facilitate scraping of wrinkled fabrics.

[0040] According to the thickness of the fabric, the second mounting rod 16 can be moved up and down along the second mounting hole 14 to adjust the height of the connecting plate 17 and the scraping plate 18, or the scraping plate 18 can be moved up and down along the connecting groove 21 to adjust the height of the scraping plate 18, so that the fabric moving with the conveyor belt can be scraped flat by the scraping plate 18 to avoid wrinkles on the surface of the conveyor belt 3 and affect the cutting of the fabric by the laser generating body 5.

[0041] The mounting frame 6 is a C-shaped structure and horizontally spans the top of the conveyor belt 3 and is located between the fabric rod 13 and the laser generating body 5; the second mounting rod 16 is a threaded rod structure and is vertically arranged and connected to the mounting frame 6 by sliding through the second mounting hole 14, and the second mounting rod 16 is connected to the mounting frame 6 by detachable fastening through the second nut 15.

[0042] The connecting plate 17 is a rectangular plate structure and is arranged horizontally. The connecting groove 21 is a rectangular groove structure. The scraping plate 18 can be slidably and adjustably installed between the connecting groove 21 and the connecting plate 17. The connecting hole 20 is a threaded hole structure. The inner end of the tightening bolt 19 tightens the two sides of the scraping plate 18.

[0043] Working method: The utility model uses the first mounting rod 9 to connect the limiting rings 7 at both ends of the fabric rod 13, so that the fabric is spread on the conveyor belt 3 and covered on the surface of the fabric rod 13. The positions of the two limiting rings 7 can be adjusted along the first mounting hole 10 according to the width of the fabric, so as to limit and block the two sides of the fabric when the fabric moves with the conveyor belt 3, avoiding the fabric from being offset and skewed when it is distributed to both sides, resulting in wrinkles in the distributed fabric, and maintaining stable and accurate distribution of the fabric through the fabric rod 13.

[0044] A connecting plate 17 and a scraping plate 18 are arranged through the mounting frame 6. The connecting plate 17 is detachably and adjustably connected to the mounting frame 6 through the second mounting rod 16 and the second nut 15, and the scraping plate 18 is detachably and adjustably connected to the connecting plate 17 through the connecting groove 21 and the tightening bolt 19. In this way, the second mounting rod 16 can be moved up and down along the second mounting hole 14 to adjust the height of the connecting plate 17 and the scraping plate 18 according to the thickness of the fabric, or the scraping plate 18 can be moved up and down along the connecting groove 21 to adjust the height of the scraping plate 18, so that the fabric moving with the conveyor belt can be scraped flat by the scraping plate 18 to avoid wrinkles on the surface of the conveyor belt 3 and affecting the cutting of the fabric by the laser generating body 5.

[0045] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A feeding device for a laser cutting bed with smooth distribution, comprising a bed (1), characterized in that: It also includes a distribution mechanism and a scraping mechanism; A bed (1), transmission rollers (2) are rotatably mounted at both ends between the two bed bodies (1), transmission belts (3) are sleeved on the surfaces of the two transmission rollers (2), a cutting base plate (4) is fixed at the top end between the two bed bodies (1), and a laser generating body (5) is mounted at the top end of the cutting base plate (4) and at the top end of the two bed bodies (1); The distribution mechanism comprises a mounting plate (8), wherein the two mounting plates (8) are respectively fixed on the top ends of the two bed bodies (1), a material rod (13) is rotatably mounted between the two mounting plates (8), a rotating thread (12) is fixed on the middle and two end surfaces of the material rod (13), a first mounting hole (10) is opened on the surface of the mounting plate (8), a first mounting rod (9) passes through the inside of the first mounting hole (10), a first nut (11) is connected on the surface of the first mounting rod (9) and at the two ends of the first mounting hole (10), and a limiting ring (7) is fixed on the inner end of the first mounting rod (9); A scraping mechanism, the scraping mechanism comprising a mounting frame (6), a second mounting hole (14) is formed at the top of the mounting frame (6), a second mounting rod (16) passes through the inside of the second mounting hole (14), a second nut (15) is connected to the surface of the second mounting rod (16) and located at the upper and lower ends of the second mounting hole (14), a connecting plate (17) is fixed to the bottom end of the second mounting rod (16), a connecting groove (21) is formed in the middle of the connecting plate (17), a scraping plate (18) is connected to the inside of the connecting groove (21), connecting holes (20) are formed on both sides of the bottom end of the connecting plate (17), and a tightening bolt (19) passes through the inside of the connecting hole (20).

2. A feeding device for a laser cutting bed with smooth distribution according to claim 1, characterized in that: The cutting bottom plate (4) is a rectangular plate structure and is horizontally slidably arranged on the top of the conveyor belt (3), and the top of the conveyor belt (3) is lower than the top of the bed (1).

3. The laser cutting bed feeding device with smooth distribution according to claim 1 is characterized by: The fabric rod (13) is horizontally arranged at the top end of the conveyor belt (3) and close to the transmission roller (2), and the limiting ring (7) is sleeved on the outside of the rotating thread (12) at intervals and without contact.

4. The laser cutting bed feeding device with smooth distribution according to claim 1 is characterized by: The first mounting rod (9) is a threaded rod structure and is horizontally arranged on both sides of the fabric rod (13). The first mounting rod (9) is slidably mounted and connected to the mounting plate (8) through the first mounting hole (10).

5. The feeding device for a laser cutting bed with smooth distribution according to claim 1 is characterized in that: The first mounting rod (9) is detachably fastened and installed with the mounting plate (8) via the first nut (11); the limiting ring (7) is a circular ring structure and is distributed at both ends of the fabric rod (13).

6. The feeding device for a laser cutting bed with smooth distribution according to claim 1 is characterized in that: The installation frame (6) is a C-shaped structure and horizontally spans the top of the conveyor belt (3) and is located between the fabric rod (13) and the laser generating body (5).

7. The feeding device for a laser cutting bed with smooth distribution according to claim 1 is characterized in that: The second mounting rod (16) is a threaded rod structure and is vertically arranged. It is slidably mounted and connected to the mounting frame (6) through the second mounting hole (14). The second mounting rod (16) is detachably fastened and mounted to the mounting frame (6) through the second nut (15).

8. The feeding device for a laser cutting bed with smooth distribution according to claim 1 is characterized in that: The connecting plate (17) is a rectangular plate structure and is arranged horizontally. The connecting groove (21) is a rectangular groove structure. The scraping plate (18) is slidably and adjustably installed between the connecting groove (21) and the connecting plate (17). The connecting hole (20) is a threaded hole structure. The inner end of the tightening bolt (19) tightens the two sides of the scraping plate (18).