Coating experiment machine

Abstract

The utility model discloses a coating experiment machine, which relates to the technical field of coating and comprises a rack, and a scraper is arranged on the rack. The device comprises a bottom plate, a working platform and two clamping assemblies, the working platform is arranged on the bottom plate, the working platform is arranged below a scraper, the two clamping assemblies are both arranged on the bottom plate, and the two clamping assemblies are used for clamping the front end and the rear end of a thin film correspondingly so that the upper surface of the working platform can support the thin film; the tension adjusting assembly is arranged between the working platform and any clamping assembly, and the tension adjusting assembly is used for adjusting the tension of the thin film so that the thin film can be tightly attached to the upper surface of the working platform; and the linear driving device is arranged on the rack, and the linear driving device is used for driving the bottom plate to move in the front-back direction, so that the scraper can scrape and coat the coating on the film. Under the action of the tension adjusting assembly in the coating experiment machine, the film can be flattened, and the accuracy of a subsequent film test result can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coating, and particularly relates to a coating experimental machine. Background Art

[0002] A coating experimental machine is a device used in a laboratory or small-scale production environment, specifically for testing and developing various coating processes and formulations. It can simulate the process flow of a large-scale coating production line. By testing the simulated coated film, it helps researchers and engineers optimize the coating formulation, process parameters, and solve problems in actual production. A coating experimental machine usually includes a working platform, clips, and a scraper. First, the operator places the film to be coated on the working platform and uses the clips to clamp one end of the film to prevent the film from falling off the working platform. Then the operator pours the coating on the film, and then the scraper starts to move, causing relative movement between the scraper and the film. The scraper can scrape the coating onto the film to complete the coating of the film, and then relevant tests are carried out on the coated film. This way of only clamping one end of the film by clips will result in insufficient tension of the film, making it impossible to ensure the flatness of the film, and further causing the coating thickness on the film to be inconsistent, which is not conducive to improving the accuracy of subsequent film test results. Content of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a coating experimental machine, which is beneficial to improving the accuracy of film test results.

[0004] The coating experimental machine according to an embodiment of the utility model includes:

[0005] A frame, on which a scraper is provided, and the scraper is slidably connected to the frame in the front-back direction;

[0006] A bottom plate, a working platform, and two clamping assemblies. The bottom plate is provided on the frame, the working platform is provided on the bottom plate, the working platform is located below the scraper, and the gap between the scraper and the working platform is for the coating and the film to pass through. Both clamping assemblies are provided on the bottom plate, both clamping assemblies are located below the upper surface of the working platform, and the two clamping assemblies are respectively provided on the front and rear sides of the working platform, and are respectively used for clamping the front and rear ends of the film, so that the upper surface of the working platform can support the film;

[0007] Tension adjustment assembly, the tension adjustment assembly is arranged on the bottom plate, the tension adjustment assembly is arranged below the upper surface of the working platform, the tension adjustment assembly is arranged between the working platform and any one of the clamping assemblies, and the tension adjustment assembly is used to adjust the tension of the film so that the film can be closely attached to the upper surface of the working platform;

[0008] Linear driving device, the linear driving device is arranged on the frame, and the linear driving device is used to drive the squeegee to move in the front-back direction so that the squeegee can scrape and coat the paint on the film.

[0009] It has at least the following beneficial effects:

[0010] When corresponding film coating tests need to be carried out, the operator can first place the film to be coated on the working platform, and then the operator can control the two clamping assemblies to clamp the front and rear ends of the film respectively. Then the operator controls the tension adjustment assembly to adjust the tension of the film so that the film can maintain a certain tension, and further enables part of the film to be closely attached to the upper surface of the working platform and remain flat. After the film is clamped and tightened, the operator pours the paint for coating on part of the film on the working platform, and then the linear driving device is started. The linear driving device can drive the squeegee to move in the front-back direction, so that there is a relative displacement between the squeegee and the film. Under the action of the squeegee, the paint on the film can be evenly scraped and coated on the film, thus completing the coating of the film. After the film coating is completed, the operator controls the two clamping assemblies to release the front and rear ends of the film, and the operator can then send the coated film into the subsequent detection instrument for testing. Under the action of the tension adjustment component in this coating experiment machine, the film can maintain a certain tension and be flatly attached to the upper surface of the working platform, so that the squeegee can evenly scrape and coat the paint on the film, and further ensure that the thickness of the paint is consistent, which is beneficial to improving the accuracy of the subsequent film test results.

[0011] For the coating experiment machine according to an embodiment of the present invention, arc chamfers are provided at both the front and rear ends of the working platform, and both of the arc chamfers are used to support the film.

[0012] For the coating experiment machine according to an embodiment of the present invention, the tension adjustment assembly includes a tension roller, a first swing arm and a second swing arm. The lower ends of the first swing arm and the second swing arm are rotatably connected to the bottom plate, and the left and right ends of the tension roller are respectively rotatably connected to the upper ends of the first swing arm and the second swing arm. The gap between the tension roller and the bottom plate is used for the film to pass through. The tension roller is used to press against the film, and the tension roller can approach or move away from the bottom plate through the first swing arm and the second swing arm to adjust the tension of the film.

[0013] According to the coating experiment machine of the embodiment of the present utility model, the tension adjusting assembly further includes a first stud and a first fastener. The first stud is arranged on the bottom plate. A first through hole is formed in the lower end of the first swing arm. The first stud passes through the first through hole. The first fastener is threadedly connected to the first stud. The first fastener can press against the first swing arm to fix the first swing arm on the bottom plate.

[0014] According to the coating experiment machine of the embodiment of the present utility model, the tension adjusting assembly further includes a first holding part, and the first holding part is connected to the first fastener.

[0015] According to the coating experiment machine of the embodiment of the present utility model, the clamping assembly includes an upper clamping plate, a lower clamping plate and a second fastener. The lower clamping plate is arranged on the bottom plate. A second threaded hole is formed in the lower clamping plate. A second through hole is formed in the upper clamping plate. The gap between the upper clamping plate and the lower clamping plate is for the film to pass through. The second fastener passes through the second through hole and is threadedly connected to the inner wall of the second threaded hole. The upper end of the second fastener can press against the upper clamping plate to clamp the film between the upper clamping plate and the lower clamping plate.

[0016] According to the coating experiment machine of the embodiment of the present utility model, the clamping assembly further includes a second holding part. The second fastener is a second bolt. The nut of the second bolt can press against the upper clamping plate to clamp the film between the upper clamping plate and the lower clamping plate. The second holding part is connected to the nut of the second bolt.

[0017] According to the coating experiment machine of the embodiment of the present utility model, it further includes a spacing adjusting assembly. The spacing adjusting assembly is slidably connected to the frame in the front-rear direction. The spacing adjusting assembly is connected to the output end of the linear driving device. The output end of the spacing adjusting assembly is connected to the scraper. The spacing adjusting assembly is used to drive the scraper to rise or fall to adjust the size of the gap between the scraper and the upper surface of the working platform.

[0018] According to the coating experiment machine of the embodiment of the present invention, the spacing adjustment assembly includes a mounting frame, two support blocks, two sliders and two third bolts. The mounting frame is slidably connected to the frame in the front-back direction, and the mounting frame is connected to the output end of the linear driving device. The two support blocks are both arranged on the mounting frame. Guide holes extending in the up-down direction are formed in both of the two support blocks, and third through holes communicating with the guide holes are formed in both of the two support blocks. Third threaded holes are formed in both of the two sliders. The two sliders can be respectively slidably arranged in the two guide holes, and the two sliders are respectively abutted against the inner walls of the two guide holes. The two sliders are respectively connected to the left and right ends of the scraper. The two third bolts respectively pass through the two third through holes and are respectively threadedly connected to the inner walls of the two third threaded holes. The lower ends of the two third bolts are respectively rotatably connected to the two support blocks, so that when the two third bolts rotate, the two sliders can drive the scraper to rise or fall.

[0019] According to the coating experiment machine of the embodiment of the present invention, the spacing adjustment assembly further includes two elastic members. The two elastic members are respectively sleeved on the two third bolts. The upper ends of the two elastic members are respectively connected to the inner walls of the two guide holes, and the lower ends of the two elastic members are respectively connected to the two sliders. The two elastic members are respectively used for pushing down the two sliders.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following further describes the present invention in conjunction with the drawings and embodiments, wherein:

[0022] Figure 1 is a schematic structural diagram of the coating experiment machine and the film of the embodiment of the present invention;

[0023] Figure 2 is a schematic structural diagram of the coating experiment machine of the embodiment of the present invention;

[0024] Figure 3 is Figure 2 a partial enlarged view of part A in

[0025] Figure 4 is Figure 2 a partial enlarged view of part B in

[0026] Figure 5 is Figure 2 a partial enlarged view of part C in

[0027] Reference numerals:

[0028] Frame 100; bottom plate 110; working platform 120; arc chamfer 121; clamping assembly 130; upper clamping plate 131; lower clamping plate 132; second fastener 133; second holding part 134; tension adjusting assembly 140; first swing arm 141; tension roller 142; first fastener 143; first holding part 144;

[0029] Distance adjusting assembly 200; scraper 210; support block 220; guide hole 221; slider 230; third bolt 240; elastic member 250; digital micrometer 260; mounting bracket 270. Specific embodiments

[0030] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., refer to the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0032] In the description of the present invention, "a plurality of" means more than two. If the first and second are described only for the purpose of distinguishing technical features, they should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0033] In the description of the present invention, unless otherwise clearly defined, words such as "set", "installed", "connected", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0034] Refer to Figure 1 and Figure 2 , according to the coating experiment machine of the embodiment of the present invention, including:

[0035] Frame 100, on which a scraper 210 is provided;

[0036] A base plate 110, a working platform 120 and two clamping assemblies 130. The working platform 120 is arranged on the base plate 110. The working platform 120 is arranged below the doctor blade 210. The gap between the doctor blade 210 and the working platform 120 is used for the coating and the film to pass through. Both of the two clamping assemblies 130 are arranged on the base plate 110. Both of the two clamping assemblies 130 are arranged below the upper surface of the working platform 120. The two clamping assemblies 130 are respectively arranged on the front and rear sides of the working platform 120. The two clamping assemblies 130 are respectively used for clamping the front and rear ends of the film, so that the upper surface of the working platform 120 can support the film. The base plate 110 is slidably connected to the frame 100 in the front - rear direction;

[0037] A tension adjusting assembly 140. The tension adjusting assembly 140 is arranged on the base plate 110. The tension adjusting assembly 140 is arranged below the upper surface of the working platform 120. The tension adjusting assembly 140 is arranged between the working platform 120 and any one of the clamping assemblies 130. The tension adjusting assembly 140 is used for adjusting the tension of the film, so that the film can be closely attached to the upper surface of the working platform 120;

[0038] A linear driving device. The linear driving device is arranged on the frame 100. The linear driving device is used to drive the base plate 110 to move in the front - rear direction, so that the doctor blade 210 can scrape the coating on the film.

[0039] It can be understood that when corresponding film coating tests need to be carried out, the operator can first place the film to be coated on the working platform 120. Then the operator can control the two clamping assemblies 130 to clamp the front and rear ends of the film respectively. Then the operator controls the tension adjusting assembly 140 to adjust the tension of the film, so that the film can maintain a certain tension, and further enables part of the film to be closely attached to the upper surface of the working platform 120 and remain flat. After the film is clamped and tensioned, the operator pours the coating for coating on part of the film on the working platform 120. Then the linear driving device is started. The linear driving device can drive the doctor blade 210 to move in the front - rear direction, so that a relative displacement is generated between the doctor blade 210 and the film. Under the action of the doctor blade 210, the coating on the film can be evenly scraped on the film by the doctor blade 210, thus completing the coating of the film. After the film coating is completed, the operator controls the two clamping assemblies 130 to loosen the front and rear ends of the film, and the operator can send the coated film into the subsequent detection instrument for testing. Under the action of the tension adjusting assembly in this coating experimental machine, the film can maintain a certain tension and be closely attached to the upper surface of the working platform 120 flatly, so that the doctor blade 210 can evenly scrape and coat the coating on the film, and further ensure that the thickness of the coating is consistent, which is beneficial to improving the accuracy of the subsequent film test results.

[0040] Reference Figure 2, arc chamfers 121 are provided at both the front and rear ends of the working platform 120, and both of the two arc chamfers 121 are used to support the thin film. It can be understood that by providing the arc chamfers 121 at both the front and rear ends of the working platform 120, the sharp edges at both the front and rear ends of the working platform 120 can be avoided from scratching the thin film, so as to ensure that the subsequent tests can be carried out normally. It should be explained that the part of the thin film supported on the upper surface of the working platform 120 is mainly used for subsequent thin film tests.

[0041] Reference Figure 2 and Figure 3 , the tension adjusting assembly 140 includes a tension roller 142, a first swing arm 141 and a second swing arm. The lower ends of the first swing arm 141 and the second swing arm are rotatably connected to the bottom plate 110 respectively. The left and right ends of the tension roller 142 are rotatably connected to the upper ends of the first swing arm 141 and the second swing arm respectively. The gap between the tension roller 142 and the bottom plate 110 is for the thin film to pass through. The tension roller 142 is used to press against the thin film. The tension roller 142 can approach or move away from the bottom plate 110 through the first swing arm 141 and the second swing arm to adjust the tension of the thin film. The tension adjusting assembly 140 further includes a first stud and a first fastener 143. The first stud is provided on the bottom plate 110. A first through hole is provided at the lower end of the first swing arm 141. The first stud passes through the first through hole. The first fastener 143 is threadedly connected to the first stud. The first fastener 143 can press against the first swing arm 141 to fix the first swing arm 141 on the bottom plate 110.

[0042] It can be understood that the thin film passes through the gap between the tension roller 142 and the bottom plate 110, and the tension roller 142 can approach or move away from the bottom plate 110 through the first swing arm 141 and the second swing arm. The tension roller 142 can press against the thin film. When the tension roller 142 swings towards the direction close to the bottom plate 110, the pressing force between the tension roller 142 and the thin film increases, that is, the tension of the thin film increases; when the tension roller 142 swings towards the direction away from the bottom plate 110, the pressing force between the tension roller 142 and the thin film decreases, that is, the tension of the thin film decreases. The operator can adjust the tension of the thin film by swinging the tension roller 142, so that the thin film can be closely attached to the upper surface of the working platform 120 with the most suitable tension, and then part of the thin film on the upper surface of the working platform 120 can be kept flat. After the tension of the thin film is adjusted, the operator can tighten the first fastener 143 so that the first fastener 143 presses against the first swing arm 141 to fix the first swing arm 141 on the bottom plate 110, and then complete the fixation of the first swing arm 141, the second swing arm and the tension roller 142, so as to avoid the change of the tension of the thin film caused by the shaking of the tension roller 142 during the scraping and coating process.

[0043] Reference Figure 3, the tension adjusting assembly 140 further includes a first gripping portion 144, and the first gripping portion 144 is connected to the first fastener 143. It can be understood that the first fastener 143 can be a nut, and the nut is connected to the first gripping portion 144. An operator can rotate the nut through the first gripping portion 144 so that the nut can press against the first swing arm 141, facilitating the operator to rotate the nut.

[0044] Reference Figure 2 and Figure 4 , the clamping assembly 130 includes an upper clamping plate 131, a lower clamping plate 132, and a second fastener 133. The lower clamping plate 132 is disposed on the bottom plate 110. A second threaded hole is formed in the lower clamping plate 132, and a second through hole is formed in the upper clamping plate 131. The gap between the upper clamping plate 131 and the lower clamping plate 132 is for the film to pass through. The second fastener 133 passes through the second through hole and is threadedly connected to the inner wall of the second threaded hole. The upper end of the second fastener 133 can press against the upper clamping plate 131 so that the upper clamping plate 131 and the lower clamping plate 132 clamp the film. It can be understood that when one end of the film needs to be clamped, the operator can first loosen the second fastener 133 and pick up the upper clamping plate 131 to increase the gap between the upper clamping plate 131 and the lower clamping plate 132. Then, the operator extends one end of the film between the upper clamping plate 131 and the lower clamping plate 132 and tightens the second fastener 133. The upper end of the second fastener 133 can press against the upper clamping plate 131, enabling the upper clamping plate 131 and the lower clamping plate 132 to clamp one end of the film. Specifically, the second fastener 133 can be a second bolt. The upper end of the second bolt is the nut of the second bolt. The nut presses against the upper clamping plate 131, and the upper clamping plate 131 and the lower clamping plate 132 can clamp the film.

[0045] Specifically, two second through holes are formed in the upper clamping plate 131, two second threaded holes are formed in the lower clamping plate 132, the number of the second fasteners 133 is two, and the two second fasteners 133 respectively pass through the two second through holes and are respectively threadedly connected to the inner walls of the two second threaded holes.

[0046] Reference Figure 4 , the clamping assembly 130 further includes a second gripping portion 134. The second fastener 133 is a second bolt, and the nut of the second bolt can press against the upper clamping plate 131 so that the upper clamping plate 131 and the lower clamping plate 132 clamp the film. The second gripping portion 134 is connected to the nut of the second bolt. It can be understood that the operator can rotate the second bolt through the second gripping portion 134, facilitating the operator to rotate the second bolt.

[0047] Reference Figure 2 and Figure 5, the coating experiment machine further includes a spacing adjustment assembly 200. The spacing adjustment assembly 200 is slidably connected to the frame 100 in the front-back direction. The spacing adjustment assembly 200 is connected to the output end of the linear driving device. The output end of the spacing adjustment assembly 200 is connected to the squeegee 210. The spacing adjustment assembly 200 is used to drive the squeegee 210 to rise or fall, so as to adjust the gap size between the squeegee 210 and the upper surface of the working platform 120.

[0048] It can be understood that the spacing adjustment assembly 200 can drive the squeegee 210 to rise or fall, so as to change the gap size between the squeegee 210 and the working platform 120, that is, the thickness of the coating scraped on the film can be changed, so that the operator can test different thicknesses of coatings.

[0049] Reference Figure 5 , the spacing adjustment assembly 200 includes a mounting frame 270, two support blocks 220, two sliders 230 and two third bolts 240. The mounting frame 270 is slidably connected to the frame 100 in the front-back direction. The mounting frame 270 is connected to the output end of the linear driving device. The two support blocks 220 are both arranged on the mounting frame 270. Guide holes 221 extending in the up-down direction are formed in the two support blocks 220. Third through holes communicating with the guide holes 221 are formed in the two support blocks 220. Third threaded holes are formed in the two sliders 230. The two sliders 230 can be respectively slidably arranged in the two guide holes 221. The two sliders 230 are respectively in contact with the inner walls of the two guide holes 221. The two sliders 230 are respectively connected to the left and right ends of the squeegee 210. The two third bolts 240 are respectively inserted into the two third through holes and are respectively threadedly connected to the inner walls of the two third threaded holes. The lower ends of the two third bolts 240 are respectively rotatably connected to the two support blocks 220, so that when the two third bolts 240 rotate, the two sliders 230 can drive the squeegee 210 to rise or fall.

[0050] It can be understood that the gap size between the squeegee 210 and the working platform 120 directly affects the thickness of the coating. When the gap size between the squeegee 210 and the working platform 120 is larger, the thickness of the coating is thicker; when the gap size between the squeegee 210 and the working platform 120 is smaller, the thickness of the coating is smaller. Since the two third bolts 240 are respectively threadedly connected to the two sliders 230, when the operator needs to adjust the thickness of the coating, the operator can rotate the two third bolts 240. The two third bolts 240 can drive the two sliders 230 to rise or fall. The two sliders 230 can drive the squeegee 210 to rise or fall, so as to achieve the purpose of adjusting the gap size between the squeegee 210 and the working platform 120, and further the thickness of the coating can be adjusted.

[0051] As an embodiment of the present utility model, it further includes a support plate and two digital micrometers 260. The lower ends of the two support blocks 220 are both connected to the mounting frame 270. The upper ends of the two support blocks 220 are connected by the support plate. The two digital micrometers 260 are both arranged on the support plate. The two digital micrometers 260 are respectively used to measure the distances from the measuring ends of the digital micrometers 260 to the left and right ends of the doctor blade 210. When an operator adjusts the gap between the doctor blade 210 and the working platform 120, the two sliders 230 drive the left and right ends of the doctor blade 210 to rise or fall respectively. During the process of adjusting the height of the doctor blade 210, the operator can always pay attention to the length values displayed on the displays of the two digital micrometers 260, and then convert them into the gap size values between the doctor blade 210 and the working platform 120, so that the operator can accurately adjust the gap size between the doctor blade 210 and the working platform 120. When the length values displayed on the displays of the two digital micrometers 260 are equal, it means that the doctor blade 210 is in a horizontal state.

[0052] Reference Figure 5 , the spacing adjustment assembly 200 further includes two elastic members 250. The two elastic members 250 are respectively sleeved on the two third bolts 240. The upper ends of the two elastic members 250 are respectively connected to the inner walls of the two guide holes 221. The lower ends of the two elastic members 250 are respectively connected to the two sliders 230. The two elastic members 250 are respectively used to push down the two sliders 230. It can be understood that the two elastic members 250 can respectively provide a pushing force to the two sliders 230, so that the threads of the third bolts 240 can always press against the inner wall of the thread groove of the third threaded hole, avoiding the sliders 230 from shaking during the scraping and coating process, and further avoiding the doctor blade 210 from shaking during the scraping and coating process, which is beneficial to ensuring the consistency of the coating thickness.

[0053] As an embodiment of the present utility model, the coating experiment machine further includes two slide rails and two sliders 230. The two slide rails are both parallel to the front-back direction. The two slide rails are arranged on the frame 100. The two sliders 230 are both arranged on the mounting frame 270. The two sliders 230 are respectively slidably connected to the two slide rails. The linear driving device includes a nut, a lead screw and a motor. The nut is arranged on the mounting frame 270. The lead screw is parallel to the front-back direction. One end of the lead screw is rotatably connected to the frame 100. The motor is arranged on the frame 100. The output end of the motor is connected to the other end of the lead screw. The motor is used to drive the lead screw to rotate.

[0054] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0055] Certainly, the present utility model is not limited to the above embodiments. Those skilled in the art can make equivalent deformations or substitutions without departing from the spirit of the present utility model, and these equivalent deformations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A coating testing machine, characterized in that, Comprising: A frame, on which a scraper is provided, and the scraper is slidably connected to the frame in the front-rear direction; A bottom plate, a working platform and two clamping assemblies. The bottom plate is provided on the frame, the working platform is provided on the bottom plate, the working platform is provided below the scraper, and the gap between the scraper and the working platform is for the coating and the film to pass through. Both of the two clamping assemblies are provided on the bottom plate, both of the two clamping assemblies are provided below the upper surface of the working platform, the two clamping assemblies are respectively provided on the front and rear sides of the working platform, and the two clamping assemblies are respectively used for clamping the front and rear ends of the film so that the upper surface of the working platform can support the film; A tension adjusting assembly, which is provided on the bottom plate, below the upper surface of the working platform, between the working platform and any one of the clamping assemblies, and is used for adjusting the tension of the film so that the film can be closely attached to the upper surface of the working platform; A linear driving device, which is provided on the frame and is used to drive the scraper to move in the front-rear direction so that the scraper can scrape the coating on the film.

2. The coating testing machine according to claim 1, wherein: Arc chamfers are provided at both the front and rear ends of the working platform, and both of the two arc chamfers are used to support the film.

3. The coating testing machine according to claim 1, characterized in that: The tension adjusting assembly includes a tensioning roller, a first swing arm and a second swing arm. The lower ends of the first swing arm and the second swing arm are rotatably connected to the bottom plate, and the left and right ends of the tensioning roller are respectively rotatably connected to the upper ends of the first swing arm and the second swing arm. The gap between the tensioning roller and the bottom plate is for the film to pass through. The tensioning roller is used to press against the film, and the tensioning roller can approach or move away from the bottom plate through the first swing arm and the second swing arm to adjust the tension of the film.

4. The coating experiment machine according to claim 3, characterized in that: The tension adjusting assembly further includes a first stud and a first fastener. The first stud is provided on the bottom plate, a first through hole is formed in the lower end of the first swing arm, the first stud passes through the first through hole, and the first fastener is threadedly connected to the first stud. The first fastener can press against the first swing arm to fix the first swing arm on the bottom plate.

5. The coating testing machine according to claim 4, characterized in that: The tension adjusting assembly further includes a first gripping portion, which is connected to the first fastener.

6. The coating experiment machine according to claim 1, wherein: The clamping assembly includes an upper clamping plate, a lower clamping plate and a second fastener. The lower clamping plate is provided on the bottom plate, a second threaded hole is formed in the lower clamping plate, a second through hole is formed in the upper clamping plate, the gap between the upper clamping plate and the lower clamping plate is for the film to pass through, the second fastener passes through the second through hole and is threadedly connected to the inner wall of the second threaded hole, and the upper end of the second fastener can press against the upper clamping plate to clamp the film between the upper clamping plate and the lower clamping plate.

7. The coating testing machine according to claim 6, wherein: The clamping assembly further includes a second holding part, the second fastener is a second bolt, and the nut of the second bolt can press against the upper clamping plate so that the upper clamping plate and the lower clamping plate clamp the film, and the second holding part is connected to the nut of the second bolt.

8. The coating experiment machine according to claim 1, characterized in that: It further includes a spacing adjustment assembly. The spacing adjustment assembly is slidably connected to the frame in the front-rear direction. The spacing adjustment assembly is connected to the output end of the linear driving device. The output end of the spacing adjustment assembly is connected to the squeegee. The spacing adjustment assembly is used to drive the squeegee to rise or fall to adjust the size of the gap between the squeegee and the upper surface of the working platform.

9. The coating testing machine according to claim 8, wherein: The spacing adjustment assembly includes a mounting frame, two support blocks, two sliders and two third bolts. The mounting frame is slidably connected to the frame in the front-rear direction. The mounting frame is connected to the output end of the linear driving device. The two support blocks are both arranged on the mounting frame. Guide holes extending in the up-down direction are formed in the two support blocks. Third through holes communicating with the guide holes are formed in the two support blocks. Third threaded holes are formed in the two sliders. The two sliders can be respectively slidably arranged in the two guide holes. The two sliders are respectively in contact with the inner walls of the two guide holes. The two sliders are respectively connected to the left and right ends of the squeegee. The two third bolts respectively pass through the two third through holes and are respectively threadedly connected to the inner walls of the two third threaded holes. The lower ends of the two third bolts are respectively rotatably connected to the two support blocks so that when the two third bolts rotate, the two sliders can drive the squeegee to rise or fall.

10. The coating experiment machine according to claim 9, wherein: The spacing adjustment assembly further includes two elastic members. The two elastic members are respectively sleeved on the two third bolts. The upper ends of the two elastic members are respectively connected to the inner walls of the two guide holes. The lower ends of the two elastic members are respectively connected to the two sliders. The two elastic members are respectively used to push down the two sliders.

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