Film coating machine with multiple coating heads for tarpaulin processing

Abstract

The invention discloses a multi-coating-head film coating machine for tarpaulin processing, and relates to the technical field of tarpaulin processing.The multi-coating-head film coating machine comprises a machine shell and coating heads, a cloth inlet is formed in the left side wall of the machine shell, a cloth outlet is formed in the right side wall of the machine shell, a heating pipe is fixedly installed on the inner wall of the machine shell, and a conveying roller is installed in the machine shell; the coating head is fixedly installed in the machine shell, the outer wall of the coating head is connected with a material uniformizing assembly, and a material storage assembly is arranged at the top of the coating head. According to the film coating machine with the multiple coating heads for tarpaulin processing, the multiple coating heads are arranged, the layout is reasonable, the two faces of tarpaulin can be continuously subjected to film coating processing in cooperation with the conveying rollers, the tarpaulin does not need to repeatedly enter and exit from the film coating machine, the entering and exiting time is saved, heating pipes are arranged to accelerate curing and film forming of paint on the surface of the tarpaulin, the efficiency of the film coating machine is further improved, and the production cost is reduced. Efficient production of the tarpaulin is facilitated, the heating pipes are distributed from sparse to dense, and further improvement of the film forming quality is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of tarpaulin processing, in particular to a coating machine with multiple coating heads for tarpaulin processing. Background Art

[0002] Tarpaulin is a widely used covering material, mainly made of high-strength fiber materials (such as polyester, nylon, etc.). It is lightweight, durable, waterproof, sun-proof, and tear-resistant. It is often used in construction sites, warehousing, logistics and transportation, outdoor activities, etc. to shield and protect items from damage by external factors such as wind, rain, sun, and dust. Tarpaulin can be customized according to specific needs, including size, color, coating type, etc., to meet the requirements of use in different scenarios. In the tarpaulin processing process, the coating machine plays a vital role. It is used to coat a special film layer on the surface of the tarpaulin. This film layer can give the tarpaulin a variety of functional properties, such as waterproof, UV protection, and corrosion resistance, thereby improving the performance and durability of the tarpaulin.

[0003] However, in the actual processing, since most of the existing coating machines for tarpaulin processing are designed with only one-sided coating in mind, if the tarpaulin needs to be coated on both sides, it must be taken out of the machine after the single-sided coating is completed, turned over, and then fed back into the machine. Due to the need for turning over, the existing coating machines for tarpaulin processing have low production efficiency when processing double-sided coating, and cannot meet the needs of large-scale production. At the same time, improper operation may also cause damage to the tarpaulin, thereby increasing material costs. In addition, since the coating must be dried after coating in order for the coating to solidify into a film, this further increases the difficulty of continuous double-sided coating.

[0004] Therefore, it is urgent to improve this shortcoming. The present invention studies and improves the existing structure and shortcomings, and provides a coating machine for tarpaulin processing with multiple coating heads. Summary of the invention

[0005] The object of the present invention is to provide a coating machine for tarpaulin processing with multiple coating heads to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a coating machine for tarpaulin processing with multiple coating heads, comprising a casing and a coating head, the left side wall of the casing is provided with a cloth inlet, and the right side wall of the casing is provided with a cloth outlet, a heating tube is fixedly installed on the inner wall of the casing, and a transmission roller is installed inside the casing, the coating head is fixedly installed inside the casing, and the outer wall of the coating head is connected to a material leveling assembly, a material storage assembly is arranged on the top of the coating head, and a material control assembly is fixedly connected to the outer wall of the material storage assembly, and a material return assembly is arranged on the top of the material storage assembly.

[0007] Furthermore, the coating head includes a mounting frame and a material guide groove, the outer surface of the mounting frame is welded to the inner wall of the casing, and the material guide groove is embedded in the top of the mounting frame.

[0008] Furthermore, the coating head also includes a servo motor and a coating roller. The servo motor is fixedly mounted on the inner surface of the mounting frame, and the output shaft of the servo motor is fixedly connected to the coating roller via a coupling, and one end of the coating roller is movably connected to the inner surface of the mounting frame via a bearing, and the coating roller is located directly below the material guide trough.

[0009] Furthermore, the material leveling assembly includes a collecting trough, a scraper, a threaded groove block and a guide rod, the scraper is fixedly connected to the inner surface of the collecting trough, and the threaded groove block is fixedly installed on the top of the collecting trough by bolts, and the guide rod is fixedly connected to the outer wall of the collecting trough.

[0010] Furthermore, the material leveling assembly also includes a guide frame, which is fixedly connected to the outer wall of the mounting frame, and the guide frame is symmetrically arranged with the midline of the side of the mounting frame as the symmetry axis.

[0011] Furthermore, the collecting trough forms a sliding structure with the guide frame through a guide rod, and one end of the guide rod is fixedly connected to the collecting trough, and the other end of the guide rod is located on the inner side of the guide frame, the end size of the guide rod is completely consistent with the internal size of the guide frame, and the guide rod slides along the inner wall of the guide frame.

[0012] Furthermore, the material leveling assembly also includes a control motor and a metal wire rod. The control motor is fixedly installed on the top of the mounting frame, and the output shaft of the control motor is fixedly connected to the metal wire rod through a coupling. The metal wire rod is threadedly connected to the threaded groove block, and the metal wire rod and the threaded groove block form a through structure.

[0013] Furthermore, the material storage assembly includes a material storage box, a discharge hole, a driving motor and a spiral stirring blade. The material storage box is mounted on a mounting frame through a material guide trough, and the bottom of the material storage box is equidistantly provided with discharge holes. The outer wall of the material storage box is embedded with a driving motor, and the output shaft of the driving motor is fixedly connected to the spiral stirring blade through a coupling.

[0014] Furthermore, the material control assembly includes a fixed frame, a bidirectional electric control push rod and an L-shaped plate, the end of the fixed frame is fixedly connected to the outer wall of the material storage box, and the inner surface of the fixed frame is fixedly connected to the bidirectional electric control push rod, and the end of the bidirectional electric control push rod is welded with an L-shaped plate.

[0015] Furthermore, the return material assembly includes a pump body, a suction pipe and a return material pipe. The pump body is fixedly installed on the top of the material storage box, and the inlet end of the pump body is fixedly connected to the suction pipe, and the bottom end of the suction pipe is immersed in the inner side of the collecting tank. The outlet end of the pump body is fixedly connected to the return material pipe, and one end of the return material pipe is connected through the top of the material storage box.

[0016] The present invention provides a coating machine for tarpaulin processing with multiple coating heads, which has the following beneficial effects:

[0017] 1. The present invention is provided with multiple coating heads with reasonable layout, and can continuously coat both sides of the tarpaulin with the transmission roller. The tarpaulin does not need to repeatedly enter and exit the coating machine, which saves the entry and exit time. A heating tube is provided to accelerate the curing and film formation of the coating on the surface of the tarpaulin, further improving the efficiency of the coating machine, which is conducive to the efficient production of the tarpaulin. The heating tube presents a distribution trend of "from sparse to dense", which can avoid the problems of film surface cracking, wrinkling, etc. caused by excessive difference in curing speed of the coating surface and the inside and outside due to sudden temperature rise, which helps to further improve the film quality.

[0018] 2. The present invention is provided with a driving motor, which drives the spiral stirring blade to stir the storage box, thereby avoiding static stratification of the paint and ensuring the uniformity of the paint. A guide trough is provided, and the paint falls into the guide trough from the equally spaced discharge holes, and then falls from the guide trough to the coating roller, which can achieve uniform material discharge. In addition, the scraper scrapes off the excess paint on the surface of the coating roller and also plays a role in leveling the material. The present invention starts from the three aspects of the uniformity of the paint itself, the uniformity of material discharge, and the uniformity of distribution, which can significantly improve the uniformity of the coating film, thereby improving the quality of the finished tarpaulin.

[0019] 3. The present invention is provided with a material leveling assembly, which drives the metal wire rod to rotate by controlling the motor, thereby driving the collection trough and the scraper to translate, so as to adjust the distance between the scraper and the surface of the coating roller, so as to achieve the purpose of strictly controlling the coating thickness on the surface of the coating roller, and then easily control the thickness of the film, so that the device can adapt to different coating processing requirements and improve the applicability of the coating machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of a coating machine for tarpaulin processing with multiple coating heads according to the present invention;

[0021] Figure 2 This is a schematic diagram of the connection structure of a coating head-storage assembly of a coating machine for tarpaulin processing with multiple coating heads according to the present invention;

[0022] Figure 3 It is a schematic diagram of the connection structure of a coating head-splitting assembly of a coating machine for tarpaulin processing with multiple coating heads according to the present invention;

[0023] Figure 4It is a schematic diagram of the disassembly structure of a coating head-storage assembly of a coating machine for tarpaulin processing with multiple coating heads according to the present invention;

[0024] Figure 5 It is a schematic diagram of the disassembled structure of the mounting frame-material introduction chute of a coating machine for tarpaulin processing with multiple coating heads according to the present invention;

[0025] Figure 6 The present invention is a schematic cross-sectional view of a material storage box of a coating machine for tarpaulin processing with multiple coating heads.

[0026] In the figure: 1, casing; 2, cloth inlet; 3, cloth outlet; 4, heating tube; 5, transmission roller; 6, coating head; 601, mounting frame; 602, material guide trough; 603, servo motor; 604, coating roller; 7, material leveling assembly; 701, collecting trough; 702, scraper; 703, threaded groove block; 704, guide rod; 705, guide frame; 706, control motor; 707, wire rod; 8, material storage assembly; 801, material storage box; 802, material outlet; 803, drive motor; 804, spiral stirring blade; 9, material control assembly; 901, fixing frame; 902, two-way electric control push rod; 903, L-shaped plate; 10, material return assembly; 1001, pump body; 1002, material extraction pipe; 1003, material return pipe. DETAILED DESCRIPTION

[0027] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] like Figure 1-Figure 5As shown, a coating machine for tarpaulin processing with multiple coating heads includes a casing 1 and a coating head 6. A cloth inlet 2 is provided on the left side wall of the casing 1, and a cloth outlet 3 is provided on the right side wall of the casing 1. A heating tube 4 is fixedly installed on the inner wall of the casing 1, and a transmission roller 5 is installed inside the casing 1. The coating head 6 is fixedly installed inside the casing 1. The coating head 6 includes a mounting frame 601 and a material guide trough 602. The outer surface of the mounting frame 601 is welded to the inner wall of the casing 1, and the material guide trough 602 is embedded on the top of the mounting frame 601. The coating head 6 also includes a servo motor 603 and a coating roller 604. The servo motor 603 is fixedly installed on the inner surface of the mounting frame 601, and the output shaft of the servo motor 603 is fixedly connected to the inner wall of the casing 1 through a coupling. A coating roller 604 is connected, and one end of the coating roller 604 is movably connected to the inner surface of the mounting frame 601 through a bearing, the coating roller 604 is located directly below the material guide groove 602, and the outer wall of the coating head 6 is connected to the material leveling component 7, the top of the coating head 6 is provided with a material storage component 8, and the outer wall of the material storage component 8 is fixedly connected to a material control component 9, the material control component 9 includes a fixed frame 901, a two-way electric control push rod 902 and an L-shaped plate 903, the end of the fixed frame 901 is fixedly connected to the outer wall of the material storage box 801, and the inner surface of the fixed frame 901 is fixedly connected to the two-way electric control push rod 902, and the end of the two-way electric control push rod 902 is welded with an L-shaped plate 903, and the top of the material storage component 8 is provided with a return component 10;

[0029] The specific operation is as follows: after the tarpaulin to be processed is fed into the equipment from the cloth inlet 2, the tarpaulin will be guided by the transmission roller 5 and transmitted to the bottom of the upper coating head 6. During the passage, the material control component 9 operates, and the L-shaped plate 903 is driven to move by the bidirectional electric push rod 902, so that the paint in the material storage component 8 can fall into the material introduction groove 602, and fall onto the coating roller 604 along the material introduction groove 602. At the same time, the servo motor 603 will drive the coating roller 604 to rotate in the direction of the material leveling component 7, so that the paint can be evenly distributed after passing through the material leveling component 7, and then rotate to the bottom to contact the upper surface of the tarpaulin, so as to evenly apply the paint to the tarpaulin. After one side of the tarpaulin is coated, it will be sent to the next coating link under the guidance of the transmission roller 5. During the transportation process, it will pass through the heating tube 4 on the right inner wall of the casing 1. The heating tube 4 can be used to heat and dry the newly applied paint to make it solidify; and because the heating tube 4 presents a "sparse to dense" distribution trend, it can avoid the problems of film surface cracking and wrinkling caused by the large difference in the curing speed of the coating surface and the inside and outside due to sudden temperature rise, which helps to further improve the uniformity of the film. Then the tarpaulin is sent to the coating head 6 at the lower layer under the guidance of the transmission roller 5. Repeat the above operation to coat the other side of the tarpaulin. After the coating is completed, the heating tube 4 arranged on the inner bottom wall of the casing 1 can be used to dry and solidify the paint, and finally sent out from the cloth outlet 3. In this case, through the design of multiple coating heads 6, the coating process can be performed on both sides of the tarpaulin, without the tarpaulin repeatedly entering and exiting the coating machine, and the heating tube 4 is used for timely curing, which significantly improves the coating process efficiency of the tarpaulin, and the internal structure layout of the device is reasonable, with high integration.

[0030] like Figure 1 , Figure 2 , Figure 5 and Figure 6As shown, a cloth inlet 2 is provided on the left side wall of the casing 1, and a cloth outlet 3 is provided on the right side wall of the casing 1, a heating tube 4 is fixedly installed on the inner wall of the casing 1, and a transmission roller 5 is installed inside the casing 1, a coating head 6 is fixedly installed inside the casing 1, and a material leveling assembly 7 is connected to the outer wall of the coating head 6, the material leveling assembly 7 includes a collecting trough 701, a scraper 702, a threaded groove block 703 and a guide rod 704, the inner surface of the collecting trough 701 is fixedly connected with the scraper 702, and the top of the collecting trough 701 is fixedly installed with a threaded groove block 703 by bolts, and the outer wall of the collecting trough 701 is fixedly connected with the guide rod 704, the material leveling assembly 7 also includes The guide frame 705 is fixedly connected to the outer wall of the mounting frame 601, and the guide frame 705 is symmetrically arranged with the midline of the side of the mounting frame 601 as the symmetry axis. The collection tank 701 forms a sliding structure with the guide frame 705 through the guide rod 704, and one end of the guide rod 704 is fixedly connected to the collection tank 701, and the other end of the guide rod 704 is located on the inner side of the guide frame 705. The end size of the guide rod 704 is completely consistent with the internal size of the guide frame 705, and the guide rod 704 slides along the inner wall of the guide frame 705. The material leveling component 7 also includes a control motor 706 and a metal wire rod 707. The control motor 706 is fixedly installed. At the top of the mounting frame 601, the output shaft of the control motor 706 is fixedly connected with a wire rod 707 through a coupling, the wire rod 707 is threadedly connected with the thread groove block 703, and the wire rod 707 and the thread groove block 703 form a through structure, and a storage assembly 8 is arranged on the top of the coating head 6, the storage assembly 8 includes a storage box 801, a discharge hole 802, a drive motor 803 and a spiral stirring blade 804, the storage box 801 is mounted on the mounting frame 601 through the material guide groove 602, and the discharge holes 802 are equidistantly opened at the bottom of the storage box 801, the outer wall of the storage box 801 is embedded with a drive motor 803, and the drive motor The output shaft of 803 is fixedly connected with the spiral stirring blade 804 through a coupling, and the outer wall of the material storage component 8 is fixedly connected with the material control component 9, and the top of the material storage component 8 is provided with a return component 10, and the return component 10 includes a pump body 1001, a pumping pipe 1002 and a return pipe 1003, the pump body 1001 is fixedly installed on the top of the material storage box 801, and the inlet end of the pump body 1001 is fixedly connected with the pumping pipe 1002, and the bottom end of the pumping pipe 1002 is immersed in the inner side of the collecting tank 701, and the outlet end of the pump body 1001 is fixedly connected with the return pipe 1003, and one end of the return pipe 1003 is connected through the top of the material storage box 801;

[0031] The specific operation is as follows: since different processing needs have different requirements on the thickness of the film, in actual operation, the motor 706 can be controlled to drive the metal wire rod 707 to rotate so that it rotates along the inner wall of the threaded groove block 703, and the guide rod 704 and the guide frame 705 can limit the movement trajectory of the collecting tank 701, so that the collecting tank 701 can be translated under the rotation drive of the metal wire rod 707, thereby driving the scraper 702 to translate. By controlling the distance between the scraper 702 and the surface of the coating roller 604, the thickness of the coating on the surface of the coating roller 604 can be strictly controlled, and then the thickness of the film can be controlled to adapt to different processing needs and improve the applicability of the device. After the excess paint on the surface of the coating roller 604 is scraped off by the scraper 702, it will flow into the collection tank 701 along the upper surface of the scraper 702. After a certain amount of paint is accumulated, the pump body 1001 is started, so that the paint in the collection tank 701 can be pumped by the pump body 1001 and return to the storage box 801 along the extraction pipe 1002 and the return pipe 1003, so as to realize the paint circulation and reduce the processing cost of the tarpaulin coating. In addition, in the process of scraping off the excess paint on the surface of the coating roller 604 by the scraper 702, it can also play a role in homogenizing the material; cooperate with the driving motor 803 to drive the spiral stirring blade 804 to stir the storage box 801, avoid static stratification of the paint, ensure the uniformity of the paint, and the paint falls into the guide groove 602 from the equidistantly arranged discharge holes 802, and then falls from the guide groove 602 to the coating roller 604, which plays a role in uniform material discharge. Through the coordinated use of the above-mentioned structures, optimization is performed in three aspects: uniformity of the coating itself, uniformity of feeding, and uniformity of distribution. This can significantly improve the uniformity of the coating film, thereby improving the quality of the finished tarpaulin product.

[0032] In summary, combined Figure 1-Figure 6As shown, the working principle of the coating machine for tarpaulin processing with multiple coating heads is as follows: First, according to the film thickness requirements of the coating processing, the control motor 706 is started to drive the metal wire rod 707 to rotate, drive the collection tank 701 to translate, thereby driving the scraper 702 to translate, and adjust the distance between the scraper 702 and the surface of the coating roller 604 to a suitable level. Then, the tarpaulin to be processed is fed into the equipment from the cloth inlet 2, and is transmitted to the bottom of the upper coating head 6 under the guidance of the transmission roller 5. During the passage, the two-way electric control push rod 902 drives the L-shaped plate 903 to move, exposing the discharge hole 802 at the bottom of the storage box 801, so that the paint in the storage box 801 falls into the guide groove 602, and falls onto the coating roller 604 along the guide groove 602. During this process, the driving motor 803 drives the spiral stirring blade 804 to stir the storage box 801 to prevent the coating from being stratified. At the same time, the servo motor 603 drives the coating roller 604 to rotate toward the material leveling component 7, and the scraper 702 scrapes off the excess coating on the surface of the coating roller 604, and at the same time, the coating on its surface is evenly distributed. The excess coating flows into the collection tank 701 along the upper surface of the scraper 702. After a certain amount of coating is accumulated, the pump body 1001 is started to make the coating return to the storage box 801 along the extraction pipe 1002 and the return pipe 1003. After the coating roller 604 is leveled, it rotates to the bottom and evenly applies the coating to the tarpaulin. Then, it is guided by the transmission roller 5 to the next film coating link. During this process, the heating pipe 4 passing through the right inner wall of the housing 1 can heat and dry the newly applied coating to solidify the coating into a film. Then, the tarpaulin is sent to the coating head 6 of the lower layer under the guidance of the transmission roller 5, and the above operation is repeated to coat the other side of the tarpaulin. After the coating is completed, the coating can be dried and cured by the heating tube 4 arranged on the bottom wall of the casing 1, and finally sent out from the cloth outlet 3.

[0033] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A coating machine for tarpaulin processing with multiple coating heads, comprising a housing (1) and a coating head (6), characterized in that: The left side wall of the casing (1) is provided with a cloth inlet (2), and the right side wall of the casing (1) is provided with a cloth outlet (3); a heating tube (4) is fixedly mounted on the inner wall of the casing (1), and a transmission roller (5) is mounted inside the casing (1); the coating head (6) is fixedly mounted inside the casing (1), and the outer wall of the coating head (6) is connected to a material leveling assembly (7); a material storage assembly (8) is arranged on the top of the coating head (6), and a material control assembly (9) is fixedly connected to the outer wall of the material storage assembly (8), and a material return assembly (10) is arranged on the top of the material storage assembly (8).

2. A coating machine for tarpaulin processing with multiple coating heads according to claim 1, characterized in that: The coating head (6) comprises a mounting frame (601) and a material guide groove (602); the outer surface of the mounting frame (601) is welded to the inner wall of the housing (1), and the material guide groove (602) is embedded in the top of the mounting frame (601).

3. A coating machine for tarpaulin processing with multiple coating heads according to claim 2, characterized in that: The coating head (6) also includes a servo motor (603) and a coating roller (604); the servo motor (603) is fixedly mounted on the inner surface of the mounting frame (601); the output shaft of the servo motor (603) is fixedly connected to the coating roller (604) via a coupling; one end of the coating roller (604) is movably connected to the inner surface of the mounting frame (601) via a bearing; the coating roller (604) is located directly below the material guide trough (602).

4. The coating machine for tarpaulin processing with multiple coating heads according to claim 2, characterized in that: The material leveling assembly (7) comprises a collecting trough (701), a scraper (702), a threaded groove block (703) and a guide rod (704); the scraper (702) is fixedly connected to the inner surface of the collecting trough (701), the threaded groove block (703) is fixedly installed on the top of the collecting trough (701) by means of bolts, and the guide rod (704) is fixedly connected to the outer wall of the collecting trough (701).

5. The coating machine for tarpaulin processing with multiple coating heads according to claim 4, characterized in that: The material leveling assembly (7) further comprises a guide frame (705), wherein the guide frame (705) is fixedly connected to the outer wall of the mounting frame (601), and the guide frame (705) is symmetrically arranged with the midline of the side of the mounting frame (601) as the symmetry axis.

6. A coating machine for tarpaulin processing with multiple coating heads according to claim 5, characterized in that: The collecting trough (701) forms a sliding structure with the guide rod (704) and the guide frame (705), and one end of the guide rod (704) is fixedly connected to the collecting trough (701), and the other end of the guide rod (704) is located on the inner side of the guide frame (705), the end size of the guide rod (704) is completely consistent with the internal size of the guide frame (705), and the guide rod (704) slides along the inner wall of the guide frame (705).

7. A coating machine for tarpaulin processing with multiple coating heads according to claim 6, characterized in that: The material leveling assembly (7) also includes a control motor (706) and a metal wire rod (707). The control motor (706) is fixedly mounted on the top of the mounting frame (601), and the output shaft of the control motor (706) is fixedly connected to the metal wire rod (707) via a coupling. The metal wire rod (707) is threadedly connected to the thread groove block (703), and the metal wire rod (707) and the thread groove block (703) form a through structure.

8. The coating machine for tarpaulin processing with multiple coating heads according to claim 2, characterized in that: The material storage assembly (8) comprises a material storage box (801), a material discharge hole (802), a driving motor (803) and a spiral stirring blade (804); the material storage box (801) is mounted on a mounting frame (601) via a material introduction trough (602), and the material storage box (801) has material discharge holes (802) equidistantly formed at the bottom thereof; the driving motor (803) is mounted on the outer wall of the material storage box (801), and the output shaft of the driving motor (803) is fixedly connected to the spiral stirring blade (804) via a coupling.

9. A coating machine for tarpaulin processing with multiple coating heads according to claim 8, characterized in that: The material control assembly (9) comprises a fixing frame (901), a bidirectional electric control push rod (902) and an L-shaped plate (903); the end of the fixing frame (901) is fixedly connected to the outer wall of the material storage box (801), and the inner surface of the fixing frame (901) is fixedly connected to the bidirectional electric control push rod (902), and the end of the bidirectional electric control push rod (902) is welded to the L-shaped plate (903).

10. The coating machine for tarpaulin processing with multiple coating heads according to claim 8, characterized in that: The return material assembly (10) comprises a pump body (1001), a material extraction pipe (1002) and a return material pipe (1003); the pump body (1001) is fixedly installed on the top of the material storage box (801), and the inlet end of the pump body (1001) is fixedly connected to the material extraction pipe (1002), and the bottom end of the material extraction pipe (1002) is immersed in the inner side of the collecting tank (701); the outlet end of the pump body (1001) is fixedly connected to the return material pipe (1003), and one end of the return material pipe (1003) is connected to the top of the material storage box (801).

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