Gluing machine capable of preventing uneven smearing

By designing an anti-uneven coating machine, the glue application and glue scraping mechanism are used to achieve uniform coating and scraping of glue, the problems of high labor intensity and uneven coating of glue in traditional production lines are solved, and the writing boards are improved Quality and production efficiency.

CN222343305UActive Publication Date: 2025-01-14HEBEI PUXIANG CULTURAL & EDUCATIONAL SUPPLIES CO LTD
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Patent Information

Application Number
CN202421049667.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-14
Publication Date
2025-01-14
Estimated Expiration
2034-05-14

AI Technical Summary

Technical Problem

The workers who add glue in the traditional writing board production line have a high labor intensity and the glue is applied unevenly, resulting in waste of glue and quality influence.

Method used

A glue coating machine that prevents uneven coating is designed, including a glue-on mechanism, a glue storage mechanism and a glue scraping mechanism. The conveyor belt and driving components are used to achieve uniform coating and scraping of glue. The transparent storage box of the glue storage mechanism is easy to observe and Replenish the amount of glue and reduce labor intensity.

Benefits of technology

The uniform application and scraping of glue is achieved, which reduces labor intensity and glue waste and improves the quality of writing boards.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a gluing machine capable of preventing uneven smearing. The gluing machine comprises a support, a conveying belt, a gluing mechanism, a glue storage mechanism and a glue scraping mechanism, and the gluing mechanism comprises a first fixing rod, a first sliding block, a second fixing rod and a second sliding block; a first rotating roller is rotatably connected between the two first sliding blocks, a second rotating roller is rotatably connected between the two second sliding blocks, the glue storage mechanism comprises a first connecting rod vertically and fixedly arranged on the two second fixing rods and a containing box, and a baffle is slidably connected to the bottom surface of the containing box; the glue scraping mechanism comprises two third fixing rods, an air cylinder, a third sliding block, a screw rod, a limiting rod, a scraping plate and a second motor, the third sliding block is slidably connected with the inner side wall of the third fixing rod, the screw rod is in threaded connection with a fourth sliding block, the two ends of the limiting rod are fixedly connected with the third sliding block, and the scraping plate is arranged below the fourth sliding block and is perpendicular to the conveying belt. And the second motor is used for driving the screw rod to rotate. The gluing device is used for solving the technical problem of non-uniform gluing.
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Description

Technical Field

[0001] The utility model belongs to the technical field of glue coating machines, in particular to a glue coating machine that prevents uneven coating. Background Art

[0002] A writing board, also known as a writing tablet, is a writing surface usually made of white metal plate material. It has similar functions to a blackboard and is a repeatedly erasable writing tool. It is usually used for teaching, conference discussions, and note-taking.

[0003] During the production process of writing boards, it is necessary to use adhesive to stick aluminum plates on both sides of the board core so that the board core and the aluminum plates are bonded to form a whole. During the bonding process, whether the adhesive is evenly applied directly affects the practical performance of the produced writing board.

[0004] At present, in the production line of traditional writing boards, glue adding workers are required to use a scoop to scoop glue from the glue storage barrel and add it to the glue roller of the glue coating machine one scoop at a time. Not only is the labor intensity high, but the glue will inevitably flow to the ground and cause waste. Moreover, when adding glue manually, the amount of glue added is difficult to control, and the amount of glue added is sometimes more and sometimes less, and is extremely uneven, which also has a certain impact on the quality of the writing board. Summary of the invention

[0005] In view of the above problems, the utility model provides a glue coating machine which can prevent uneven coating.

[0006] To achieve the above-mentioned purpose, the utility model provides a glue coating machine for preventing uneven smearing, comprising a bracket, a conveyor belt arranged on the bracket, a gluing mechanism arranged at one end of the bracket, a glue storage mechanism, and a glue scraping mechanism arranged on the bracket away from the gluing mechanism, wherein the gluing mechanism comprises first fixed rods symmetrically and vertically fixed at both ends along the width direction of the bracket, first sliders respectively fixed at the bottom ends of the two first fixed rods, second fixed rods vertically fixed at the sides of the two first fixed rods, second sliders respectively fixed on the two second fixed rods, and a driving assembly; the first fixed rod and the second fixed rod are both hollow inside and close to the side opening of the conveyor belt, a first rotating roller is rotatably connected between the two first sliders, and a second rotating roller is rotatably connected between the two second sliders, and the driving assembly drives the first rotating roller and the second rotating roller to rotate;

[0007] The glue storage mechanism comprises a first connecting rod vertically fixed on two second fixing rods, and a receiving box fixed on the first connecting rod and having a hollow interior, the receiving box being arranged close to the first fixing rod, the bottom surface of the receiving box being provided with an opening and a baffle being slidably connected to the opening;

[0008] The glue scraping mechanism includes a third fixed rod corresponding to the two first fixed rods and arranged parallel to the two first fixed rods, cylinders fixed in the two third fixed rods along the height direction, a third slider fixed at the top of the two cylinders, a screw rod rotatably connected between the two third sliders, a limit rod arranged parallel to the screw rod, a scraper, and a second motor. The third fixed rod is fixed at an end of the bracket away from the glue applying mechanism, the interior of the third fixed rod is hollow and close to the side opening of the conveyor belt, the third slider is slidably connected to the inner side wall of the third fixed rod, a fourth slider is threadedly connected to the screw rod, the limit rod passes through the fourth slider and is fixedly connected to the third slider at both ends, the scraper is arranged below the fourth slider, the scraper is arranged perpendicular to the conveyor belt, and the second motor is used to drive the screw rod to rotate.

[0009] Optionally, the driving assembly includes a first pulley fixed at one end of the first rotating roller, a second pulley fixed at one end of the second rotating roller, a belt sleeved on the first pulley and the second pulley, and a first motor, wherein a first slide groove is formed on the side of the second fixing rod away from the conveyor belt, a first mounting plate is fixed on the side of the second slider close to the first slide groove, the first motor is fixed on the first mounting plate and the output shaft of the first motor is fixedly connected to the second rotating roller.

[0010] Optionally, the glue storage mechanism further includes a glue storage barrel and a connecting pipe which are arranged on one side of the bracket and are hollow inside. A glue pump is fixedly installed in the glue storage barrel, and both ends of the connecting pipe are respectively fixedly connected and communicated with the containing box and the glue pump.

[0011] Optionally, a valve is fixedly provided on the connecting pipe.

[0012] Optionally, the containing box is transparent.

[0013] Optionally, a second slide groove is opened on the side of one of the third fixed rods away from the conveyor belt, and a second mounting plate in a T-shape is arranged at the second slide groove, one end of the second mounting plate passes through the second slide groove and is fixedly connected to the third slider, the second motor is fixedly mounted on the second mounting plate and the output shaft of the second motor is fixedly connected to one end of the third slider.

[0014] Optionally, the scraper is detachably connected to the fourth sliding block.

[0015] Optionally, a second connecting rod arranged perpendicular to the conveyor belt is fixedly disposed on the bottom surface of the fourth sliding block, and the scraper is fixed to the bottom end of the second connecting rod by screws.

[0016] The beneficial effects of the utility model are:

[0017] 1. The setting of the glue scraping mechanism of the present application can scrape the glue on the writing board after glue coating, so as to evenly scrape the glue and facilitate subsequent operations.

[0018] 2. The setting of the glue storage mechanism of the present application, wherein the storage box is transparent for easy observation, and the glue storage barrel and glue pump facilitate timely replenishment of the glue in the storage box, thereby reducing labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

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

[0021] Figure 2 It is a schematic diagram to show the partial structure of the gluing mechanism.

[0022] Figure 3 It is a schematic diagram to show the partial structure of the drive component.

[0023] Figure 4 It is a schematic diagram to show the structure of the glue storage mechanism.

[0024] Figure 5 It is to show the partial cross-sectional view of the glue pump.

[0025] Figure 6 It is a schematic diagram to show the partial structure of the scraper mechanism.

[0026] Description of Reference Numerals

[0027] 1. bracket; 11. roller; 12. drive motor; 2. conveyor belt; 3. gluing mechanism; 31. first fixed rod; 32. first slider; 33. second fixed rod; 331. first slide; 332. first connecting rod; 34. second slider; 341. first mounting plate; 35. first rotating roller; 36. second rotating roller; 37. drive assembly; 371. first motor; 372. first pulley; 373. second pulley; 374 , belt; 4, glue storage mechanism; 41, glue storage barrel; 411, glue pump; 42, storage box; 421, baffle; 43, connecting pipe; 44, valve; 5, glue scraping mechanism; 51, third fixing rod; 511, second slide groove; 52, cylinder; 53, third slider; 531, second mounting plate; 54, screw; 55, limit rod; 56, scraper; 57, second motor; 58, fourth slider; 581, second connecting rod; 582, screw. DETAILED DESCRIPTION

[0028] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0029] Reference Figure 1 , a glue coating machine for preventing uneven smearing, comprising a bracket 1, a conveyor belt 2, a glue applying mechanism 3, a glue storage mechanism 4, and a glue scraping mechanism 5. The bracket 1 is provided with rollers 11 at the feeding end and the discharging end, respectively. The rollers 11 are arranged along the width direction of the bracket 1, and both ends of the rollers 11 are rotatably connected to the side wall of the bracket 1. The conveyor belt 2 is sleeved on the two rollers 11, one end of the conveyor belt 2 is the feeding end, and the other end is the discharging end. The bracket 1 is fixedly provided with a driving motor 12 on the side wall of the roller 11 near the discharging end, and the output shaft of the driving motor 12 is fixedly connected to one end of the roller 11. The glue applying mechanism 3 is arranged on the bracket 1 near the feeding end, and is used to apply glue to the writing board. The glue storage mechanism 4 is arranged between the glue applying mechanism 3 and the glue scraping mechanism 5, and is used to store glue and apply glue. The glue scraping mechanism 5 is arranged on the bracket 1 near the discharging end, and is used to scrape the glue on the writing board.

[0030] When in use, place the core of the writing board on the feeding end of the conveyor belt 2, start the drive motor 12, the drive motor 12 can drive the roller 11 to rotate, and then move the conveyor belt 2, so that the core is transported to the gluing mechanism 3 for gluing, and then transported to the glue scraping mechanism 5. Start the glue scraping mechanism 5 to evenly scrape the glue on the core, and finally transport it to the discharge end for the next process.

[0031] Refer to Figure 2 and Figure 3The gluing mechanism 3 includes a first fixed rod 31, a first slider 32, a second fixed rod 33, a second slider 34, a first rotating roller 35, a second rotating roller 36, and a driving assembly 37. There are two first fixed rods 31, and the two first fixed rods 31 are arranged perpendicular to the conveyor belt 2, and the two first fixed rods 31 are symmetrically fixed at both ends of the bracket 1 along its width direction. The two first fixed rods 31 are arranged with a hollow interior, and the sides of the two first fixed rods 31 close to the conveyor belt 2 are arranged with an opening. There are two first sliders 32, and the two first sliders 32 correspond to the two first fixed rods 31 one by one. The first slider 32 is arranged at the bottom end of the first fixed rod 31, and the side of the first slider 32 is fixedly connected to the inner side wall of the first fixed rod 31. The first rotating roller 35 is arranged along the width direction of the bracket 1 and is arranged between the two first sliders 32. A gap for the writing board core to pass through is left between the bottom end of the first rotating roller 35 and the conveyor belt 2, and the two ends of the first rotating roller 35 are rotatably connected to the two first sliders 38 respectively.

[0032] Reference Figure 2 and Figure 3 , there are two second fixed rods 33, and the two second fixed rods 33 correspond to the two first fixed rods 31 in one-to-one position, and the second fixed rods 33 are arranged on the side of the first fixed rod 31 away from the scraping mechanism 5 along the length direction of the conveyor belt 2. The second fixed rod 33 is hollow inside, and the side of the second fixed rod 33 close to the conveyor belt 2 is open, and the side away from the conveyor belt 2 is provided with a first slide groove 331. There are two second sliders 34, and the two second sliders 34 correspond to the two second fixed rods 33 respectively. The second slider 34 is arranged at one end of the second fixed rod 33 close to the scraping mechanism 5, and the side of the second slider 34 is fixedly connected to the inner side wall of the second fixed rod 33. The second rotating roller 36 is arranged parallel to the first rotating roller 35, and is arranged between the two second sliders 34. A gap for the writing board core to pass through is left between the bottom end of the second rotating roller 36 and the conveyor belt 2, and the two ends of the second rotating roller 36 are rotatably connected to the two second sliders 34 respectively.

[0033] Reference Figure 2 and Figure 3The driving assembly 37 includes a first motor 371, a first pulley 372, a second pulley 373, and a belt 374. One of the second fixed rods 33 is provided with a first mounting plate 341 at the second slide slot 511, and one end of the first mounting plate 341 passes through the first slide slot 331 and is fixedly connected to the side wall of the second slider 34. The first motor 371 is fixedly mounted on the first mounting plate 341, and the output shaft of the first motor 371 passes through the first slide slot 331 and is fixedly connected to one end of the second rotating roller 36. The first pulley 372 is sleeved on one end of the first rotating roller 35 along the length direction thereof and is fixedly connected thereto, the second pulley 373 is sleeved on one end of the second rotating roller 36 along the length direction thereof and is fixedly connected thereto, and the belt 374 is sleeved on the first pulley 372 and the second pulley 373.

[0034] When in use, the board core will first arrive under the second rotating roller 36 with the conveyor belt 2. After the second rotating roller 36 presses the board core, the board core can be made flatter, which is convenient for subsequent gluing. Then, it is transported to the gluing mechanism 4 with the conveyor belt 2 to start gluing. The glue storage mechanism 4 is opened for gluing, and the first motor 371 is started. The first motor 371 can drive the second rotating roller 36 to rotate, and then drive the second pulley 373 to rotate. Due to the connecting action of the belt 374, the first pulley 372 rotates, thereby driving the first rotating roller 35 to rotate. After the first rotating roller 35 presses the board core, the preliminary gluing of the board core can be achieved.

[0035] Reference Figure 4 and Figure 5 The glue storage mechanism 4 includes a glue storage barrel 41, a receiving box 42, and a connecting pipe 43. The glue storage barrel 41 is arranged on one side of the bracket 1. The glue storage barrel 41 is hollow inside, and a glue pump 411 is fixed inside the glue storage barrel 41. Figure 2 , the top surfaces of the two second fixing rods 33 are symmetrically fixed with first connecting rods 332 at positions close to the first fixing rods 31, and the two first connecting rods 332 are arranged perpendicular to the second fixing rods 33. The storage box 42 is transparent, and the interior of the storage box 42 is hollow. An opening is provided on the bottom surface of the storage box 42, and a baffle 421 is slidably connected to the bottom surface at the opening. The connecting pipe 43 is arranged between the storage box 42 and the glue storage barrel 41, one end of the connecting pipe 43 is fixed on the storage box 42 and connected to the interior thereof, and the other end is fixedly connected to the glue pump 411, and the connecting pipe 43 is fixedly provided with a valve 44 at a position close to the storage box 42.

[0036] When in use, the baffle 421 at the bottom of the storage box 42 is opened, so that the glue can flow between the first rotating roller 35 and the second rotating roller 36. Since the first rotating roller 35 and the second rotating roller 36 are rotating, the glue can be applied to the board core; the storage box 42 is transparent. When it is seen that the amount of glue in the storage box 42 is small, the valve 44 is opened and the glue pump 411 is started, so that the glue in the glue storage barrel 41 can enter the storage box 42, which is convenient for use.

[0037] Reference Figure 1 and Figure 6 The scraping mechanism 5 includes a third fixed rod 51, a cylinder 52, a third slider 53, a screw 54, a limit rod 55, a scraper 56, and a second motor 57. There are two third fixed rods 51, and the two third fixed rods 51 are arranged parallel to the first fixed rod 31 at the position of the bracket 1 close to the discharge end, and are respectively fixed at both ends of the bracket 1 along its width direction. The two third fixed rods 51 are hollow inside, and the side opening close to the conveyor belt 2 and the side away from the conveyor belt 2 are provided with a second slide groove 511. There are two cylinders 52, and they correspond to the two third fixed rods 51 respectively. The cylinder 52 is fixed on the bottom surface of the third fixed rod 51 in the height direction. There are two third sliders 53, and the two third sliders 53 correspond to the two cylinders 52 respectively. The third slider 53 is arranged in the third fixed rod 51 and is slidably connected thereto, and the bottom surface of the third slider 53 is fixedly connected to the top of the cylinder 52. The screw rod 54 is arranged between the two third sliders 53 along the width direction of the bracket 1, one end of the screw rod 54 passes through one of the third sliders 53 and is rotatably connected thereto, and the other end is also rotatably connected to the other third slider 53. A fourth slider 58 is sleeved on the screw rod 54, and the fourth slider 58 is rotatably connected to the screw rod 54. The limiting rod 55 is arranged parallel to the screw rod 54 and is arranged between the two third sliders 53. The limiting rod 55 passes through the fourth slider 58, and the two ends are respectively fixedly connected to the two third sliders 53, and the fourth slider 58 is slidably connected to the limiting rod 55. A second connecting rod 581 is fixedly arranged on the bottom surface of the fourth slider 58, and the second connecting rod 581 is arranged perpendicular to the conveyor belt 2. The scraper 56 is arranged perpendicular to the third fixed rod 51, and a screw 582 is arranged between the bottom ends of the scraper 56 and the second connecting rod 581, and the two are fixed by the screw 582. One of the third fixing rods 51 is provided with a second mounting plate 531 at the second slide slot 511. The second mounting plate 531 is T-shaped. One end of the second mounting plate 531 passes through the second slide slot 511 and is slidably connected thereto. The second mounting plate 531 is fixedly connected to the side wall of the third slider 53 at the end passing through the slide slot. The second motor 57 is fixedly mounted on the second mounting plate 531, and the output shaft of the second motor 57 is fixedly connected to the end of the screw rod 54 passing through the third slider 53.

[0038] When in use, the air cylinder 52 is started to adjust the height of the third slider 53, and then the height of the scraper 56 is adjusted. The second motor 57 is started, and the second motor 57 can drive the screw 54 to rotate. Due to the limiting effect of the limiting rod 55, the fourth slider 58 can only move along the length direction of the screw 54, and the scraper 56 can also move along the length direction of the screw 54, so as to adjust the position of the scraper 56. When the core coated with glue reaches the glue scraping mechanism 5, the scraper 56 can scrape the glue on the core to make the glue more uniform. After a period of use, the screw 582 can be unscrewed to remove the scraper 56 for cleaning.

[0039] The implementation principle of the embodiment of the present application is as follows: the operator first adjusts the position of the scraper 56 according to the thickness of the writing board core, places the writing board core at the feeding end of the conveyor belt 2, starts the drive motor 12, and the conveyor belt 2 starts to move, driving the board core to move. The board core will first reach the bottom of the second rotating roller 36, and roll on the board core through the second rotating roller 36, which can make the board core be pressed flatter and facilitate gluing. Then the board core is transported to the gluing mechanism 4, and at the same time, the baffle 421 on the receiving box 42 is opened to allow the glue to flow down, and then the first motor 371 is started. As the first rotating roller 35 rotates, the glue can be applied to the board core. As the conveyor belt 2 moves, the board core reaches the bottom of the scraper 56, and the scraper 56 scrapes the glue to make the glue on the board core more uniform. Finally, the board core reaches the discharge end for the next process.

[0040] Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Claims

1. A glue coating machine for preventing uneven smearing, characterized in that: The invention comprises a support (1), a conveyor belt (2) arranged on the support (1), a gluing mechanism (3) arranged at one end of the support (1), a glue storage mechanism (4), and a glue scraping mechanism (5) arranged on the support (1) away from the gluing mechanism (3). The gluing mechanism (3) comprises first fixed rods (31) symmetrically and vertically fixed at two ends along the width direction of the support (1), first sliders (32) respectively fixed at the bottom ends of the two first fixed rods (31), second fixed rods (33) vertically fixed at the sides of the two first fixed rods (31), second sliders (34) respectively fixed on the two second fixed rods (33), and a driving component (37); the first fixed rod (31) and the second fixed rod (33) are both hollow inside and close to the side opening of the conveyor belt (2); a first rotating roller (35) is rotatably connected between the two first sliders (32), and a second rotating roller (36) is rotatably connected between the two second sliders (34); the driving component (37) drives the first rotating roller (35) and the second rotating roller (36) to rotate; The glue storage mechanism (4) comprises a first connecting rod (332) vertically fixed on two second fixing rods (33), and a receiving box (42) fixed on the first connecting rod (332) and having a hollow interior, wherein the receiving box (42) is arranged close to the first fixing rod (31), and an opening is arranged on the bottom surface of the receiving box (42) and a baffle (421) is slidably connected to the opening; The glue scraping mechanism (5) comprises a third fixed rod (51) corresponding to and arranged in parallel with the two first fixed rods (31), a cylinder (52) fixed in the two third fixed rods (51) along the height direction, a third slider (53) fixed at the top of the two cylinders (52), a screw rod (54) rotatably connected between the two third sliders (53), a limit rod (55) arranged parallel to the screw rod (54), a scraper (56), and a second motor (57). The third fixed rod (51) is fixed on a part of the bracket (1) away from the glue applying mechanism (3). The third fixed rod (51) is hollow inside and has a side opening close to the conveyor belt (2); the third slider (53) is slidably connected to the inner wall of the third fixed rod (51); a fourth slider (58) is threadedly connected to the screw rod (54); the limit rod (55) passes through the fourth slider (58) and is fixedly connected to the third slider (53) at both ends; the scraper (56) is arranged below the fourth slider (58); the scraper (56) is arranged vertically to the conveyor belt (2); and the second motor (57) is used to drive the screw rod (54) to rotate.

2. The anti-uneven smearing glue coating machine according to claim 1, characterized in that: The driving assembly (37) comprises a first pulley (372) fixedly mounted on one end of a first rotating roller (35), a second pulley (373) fixedly mounted on one end of a second rotating roller (36), a belt (374) sleeved on the first pulley (372) and the second pulley (373), and a first motor (371), wherein a first slide groove (331) is provided on a side of the second fixing rod (33) away from the conveyor belt (2), a first mounting plate (341) is fixedly mounted on a side of the second sliding block (34) close to the first slide groove (331), the first motor (371) is fixedly mounted on the first mounting plate (341), and an output shaft of the first motor (371) is fixedly connected to the second rotating roller (36).

3. The anti-uneven smearing glue coating machine according to claim 1, characterized in that: The glue storage mechanism (4) further comprises a glue storage barrel (41) which is arranged on one side of the bracket (1) and is hollow inside, and a connecting pipe (43). A glue pump (411) is fixedly arranged inside the glue storage barrel (41), and two ends of the connecting pipe (43) are respectively fixedly connected to and communicated with the containing box (42) and the glue pump (411).

4. The anti-uneven smearing glue coating machine according to claim 3, characterized in that: The connecting pipe (43) is fixedly provided with a valve (44).

5. The anti-uneven smearing glue coating machine according to claim 1, characterized in that: The containing box (42) is transparent.

6. The anti-uneven smearing glue coating machine according to claim 1, characterized in that: A second slide groove (511) is provided on the side of one of the third fixed rods (51) away from the conveyor belt (2); a second mounting plate (531) arranged in a T-shape is provided at the second slide groove (511); one end of the second mounting plate (531) passes through the second slide groove (511) and is fixedly connected to the third slider (53); the second motor (57) is fixedly arranged on the second mounting plate (531) and the output shaft of the second motor (57) is fixedly connected to one end of the third slider (53).

7. The anti-uneven smearing glue coating machine according to claim 1, characterized in that: The scraper (56) is detachably connected to the fourth sliding block (58).

8. The anti-uneven smearing glue coating machine according to claim 7, characterized in that: A second connecting rod (581) arranged vertically on the conveyor belt (2) is fixedly disposed on the bottom surface of the fourth sliding block (58), and the scraper (56) is fixed to the bottom end of the second connecting rod (581) by means of a screw (582).