Clamping arm and clamping device

Abstract

The present application provides a clamping arm and a clamping device, which relates to the field of automobile parts preparation devices. A clamping arm is used to clamp a substrate so as to spray slurry on the substrate, comprising: an outer tube and an inner tube, the outer tube wall is fixed with a plurality of first clamping teeth arranged at intervals along the axial direction of the outer tube; the inner tube is inserted into the outer tube, and the inner tube wall is fixed with a plurality of second clamping teeth extending out of the outer tube and cooperating with the first clamping teeth; the inner tube is rotatably connected with the outer tube so that the first clamping teeth and the second clamping teeth move toward each other to clamp the substrate, or move away from each other to release the substrate; the outer walls of the first clamping teeth and the second clamping teeth are both coated with a first anti-sticking layer, and the thickness of the first anti-sticking layer is 1-3 mm. The clamping arm is more stable in clamping thin substrates, the slurry is not easy to accumulate on the clamping teeth, and the slurry on the clamping teeth is easy to clean.

Description

Technical Field

[0001] The present application relates to the field of automobile parts preparation devices, and in particular, to a clamping arm and a clamping device. Background Art

[0002] The PHC polyurethane spray molding process is widely used in the automotive parts industry. However, when the PHC process is used to mold products, the reliability of the robot clamp arm affects the one-time molding pass rate of the product. The existing PHC process robot clamp arm is a double-layer tube, and a number of clamping teeth are set on the inner tube and the outer tube to drive the inner tube and the outer tube to rotate relative to each other for clamping or releasing. When working, the inner tube and the outer tube are driven to rotate relative to drive the clamping teeth to clamp the PHC substrate, and then spray the substrate.

[0003] At present, the clamping arm of the PHC process robot is suitable for clamping thick substrates (5-20mm), but is relatively unreliable for clamping thin substrates (≤5mm). The substrate is easy to fall off, resulting in material waste after spraying. And due to the characteristics of the PHC process, during the polyurethane spraying process, the outer tube and the clamping teeth will inevitably stick to the polyurethane slurry. After a long period of operation, the polyurethane slurry will adhere to and accumulate on the outer tube and the clamping teeth, causing the slurry to be embedded in the clamping teeth and difficult to clean. At the same time, when the substrate sprayed with polyurethane slurry is subsequently placed on the workbench for pressing, when the clamping arm releases the substrate, the accumulation of slurry on the clamping teeth will adhere to the substrate, causing the position of the substrate placed on the workbench to shift, which is not conducive to subsequent pressing operations. Utility Model Content

[0004] The purpose of the present application is to provide a clamping arm and a clamping device to improve the technical problems that the existing clamping arm cannot clamp the thin substrate firmly and the slurry accumulated on the clamping teeth is difficult to clean.

[0005] In the first aspect, an embodiment of the present application provides a clamping arm for clamping a substrate so as to spray a slurry on the substrate, comprising: an outer tube and an inner tube, wherein the outer tube wall is fixed with a plurality of first clamping teeth arranged at intervals along the axial direction of the outer tube; the inner tube is inserted into the outer tube, and the inner tube wall is fixed with a plurality of second clamping teeth extending out of the outer tube and cooperating with the first clamping teeth; the inner tube is rotatably connected to the outer tube so that the first clamping teeth and the second clamping teeth move toward each other to clamp the substrate, or move away from each other to release the substrate; the outer walls of the first clamping teeth and the second clamping teeth are both coated with a first anti-sticking layer, and the thickness of the first anti-sticking layer is 1-3 mm.

[0006] In the above implementation process, the present application provides a first anti-sticking layer on the outer walls of the first clamping teeth and the second clamping teeth. During the process of spraying the polyurethane slurry on the substrate, the polyurethane slurry will not stick to the first anti-sticking layer, thereby avoiding the accumulation of the polyurethane slurry on the first clamping teeth and the second clamping teeth, thereby alleviating the problem of the slurry being embedded in the clamping teeth and difficult to clean; at the same time, since the first clamping teeth and the second clamping teeth are coated with the first anti-sticking layer of a certain thickness, when clamping a thin substrate (≤5mm), the gap that may exist between the contact surfaces of the first clamping teeth and the second clamping teeth can be reduced, so that the clamping of the thin substrate (≤5mm) can be more reliable and not easy to fall off.

[0007] In a possible implementation, the hardness of the first anti-adhesive layer is 60-80 kgf / mm 2 .

[0008] The present application sets the hardness of the first anti-sticking layer within a certain range to prevent the first anti-sticking layer from being too soft and causing insufficient supporting force when clamping the substrate, thereby preventing unstable clamping of the substrate.

[0009] In a possible implementation, a baffle is provided on one side of the outer tube so that the first clamping tooth and the second clamping tooth are located on the same side of the baffle, the length direction of the baffle extends along the axial direction of the outer tube, and the end of the baffle in the width direction away from the outer tube is connected to the first clamping tooth.

[0010] The present application sets a baffle on one side of the outer tube. During the process of spraying polyurethane slurry on the substrate, the baffle can further block the polyurethane slurry and reduce the accumulation of polyurethane slurry on the first clamping teeth and the second clamping teeth. After the baffle blocks the polyurethane slurry, the polyurethane slurry on the baffle is also easier to clean.

[0011] In a possible implementation, the first clamping tooth includes a connecting plate and a clamping plate connected to each other, the end of the connecting plate away from the clamping plate is connected to the outer tube, the baffle is connected to the connection between the connecting plate and the clamping plate, and the width direction of the baffle extends beyond the connection by 20-30 mm.

[0012] The baffle plate of the present application is arranged to extend 20-30 mm beyond the connection between the connecting plate and the clamping plate in the width direction, which can further shield the first clamping teeth and the second clamping teeth, and further reduce the accumulation of polyurethane slurry on the first clamping teeth and the second clamping teeth.

[0013] In a possible implementation, an angle between an extension direction of the baffle and an extension direction of the connecting plate is 30-60°.

[0014] In the present application, the angle formed between the extension direction of the baffle and the extension direction of the connecting plate is set to 30-60°, which can better cover the first clamping teeth and the second clamping teeth, and on the other hand, facilitate the subsequent cleaning of the polyurethane slurry accumulated on the baffle.

[0015] In a possible implementation, a second anti-sticking layer is provided on the outer wall of the baffle, and the thickness of the second anti-sticking layer is 1-3 mm.

[0016] In the present application, a second anti-sticking layer of a certain thickness is arranged on the outer wall of the baffle, and the polyurethane slurry will not stick to the second anti-sticking layer, which can further facilitate the cleaning of the polyurethane slurry on the baffle.

[0017] In a possible implementation, the first clamping teeth and the second clamping teeth both include wide clamping teeth and narrow clamping teeth that are spaced apart, and along the axial direction of the outer tube, the width of the wide clamping teeth is 2-3 times the width of the narrow clamping teeth; the width of the narrow clamping teeth is not less than 100 mm.

[0018] The present application sets narrow clamping teeth of a certain width, and sets wide clamping teeth with a width 2-3 times the width of the narrow clamping teeth at intervals between the narrow clamping teeth, so that the clamping of the substrate is more stable and reliable, and the risk of wrinkles occurring during the flipping process of the substrate is greatly reduced.

[0019] In a possible implementation, along the axial direction of the outer tube, two adjacent first clamping teeth are distributed at equal intervals, and two adjacent second clamping teeth are distributed at equal intervals.

[0020] The present application arranges two adjacent first clamping teeth to be equally spaced and two adjacent second clamping teeth to be equally spaced, which helps the first clamping teeth and the second clamping teeth to further stably and reliably clamp the substrate.

[0021] In the second aspect, an embodiment of the present application provides a clamping device, comprising: a clamping assembly and a fixing assembly, the clamping assembly comprising two clamping arms as in the first aspect, the two clamping arms being respectively used to fix the opposite ends of the substrate; the fixing assembly being used to fix the clamping assembly and drive the clamping assembly to move and rotate.

[0022] The clamping device of the present application includes the two clamping arms mentioned above, which are respectively used to fix the opposite ends of the substrate. When spraying slurry on the substrate, the two clamping arms can stably and reliably clamp and fix the substrate to prevent the substrate from falling off; at the same time, the accumulation of polyurethane slurry on the clamping arms is reduced, and the polyurethane slurry on the clamping arms is easy to clean.

[0023] In a possible implementation, the clamping assembly further includes a driving member connected to the outer tube or the inner tube of the clamping arm, and the driving member is used to drive the outer tube and the inner tube to rotate relative to each other.

[0024] In the present application, a driving member is used to drive the outer tube and the inner tube to rotate relative to each other, so that the first clamping teeth and the second clamping teeth move toward each other to clamp the substrate, or move away from each other to release the substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of a clamping device provided in an embodiment of the present application;

[0027] Figure 2 A schematic diagram of a clamping arm provided in an embodiment of the present application;

[0028] Figure 3 for Figure 2 Cross-section view of AA.

[0029] Icons: 1-clamping arm; 11-outer tube; 111-first clamping tooth; 1111-connecting plate; 1112-clamping plate; 12-inner tube; 121-second clamping tooth; 13-first anti-sticking layer; 14-baffle; 15-second anti-sticking layer; 2-clamping device; 21-clamping assembly; 22-fixing assembly. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of this application, it should be noted that the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] Example

[0037] The present application intends to improve the existing technical problems. The present application embodiment provides a clamping device, such as Figure 1 As shown, the clamping device 2 includes: a clamping assembly 21 and a fixing assembly 22. The clamping assembly 21 includes two clamping arms 1, and the two clamping arms 1 are respectively used to fix the opposite ends of the substrate; the fixing assembly 22 is used to fix the clamping assembly 21 and drive the clamping assembly 21 to move and rotate. The two clamping arms 1 can be used to fix the opposite ends of the substrate respectively. When the slurry is sprayed on the substrate, the two clamping arms 1 can stably and reliably clamp and fix the substrate to prevent the substrate from falling off; at the same time, the polyurethane slurry is reduced from accumulating on the clamping arms 1, and the polyurethane slurry on the clamping arms 1 is easy to clean.

[0038] In some embodiments, the clamping assembly further includes a driving member, which is connected to the outer tube 11 or the inner tube 12 of the clamping arm 1, and the driving member is used to drive the outer tube 11 and the inner tube 12 to rotate relative to each other. The driving member drives the outer tube 11 and the inner tube 12 to rotate relative to each other, so that the first clamping teeth 111 and the second clamping teeth 121 move toward each other to clamp the substrate, or move away from each other to release the substrate. As an example, the driving member can be a motor or a cylinder, which only needs to realize driving the outer tube 11 and the inner tube 12 to rotate relative to each other, so that the first clamping teeth 111 and the second clamping teeth 121 move toward each other or away from each other to clamp or release the substrate.

[0039] As an example, the fixing assembly 22 may be, but is not limited to, a robot arm, which can drive the clamping assembly 21 to move freely and can drive the clamping assembly 21 to rotate 360° along its axis.

[0040] When in use, the fixing component 22 drives the clamping component 21 to move to the substrate placement position, and the driving member drives the outer tube 11 and the inner tube 12 to rotate relative to each other so that the first clamping teeth 111 and the second clamping teeth 121 move away from each other and open, and are placed at both ends of the substrate, and then the outer tube 11 and the inner tube 12 are driven to rotate relative to each other so that the first clamping teeth 111 and the second clamping teeth 121 move toward each other and clamp, so that the opposite ends of the substrate are clamped and fixed by the two clamping arms 1. Stable and reliable clamping and fixing of the substrate is ensured to prevent the substrate from falling off. The fixing component 22 then drives the substrate clamped by the clamping component 21 to move to the spraying component to first spray the polyurethane slurry on one side of the substrate, and then the fixing component 22 drives the substrate clamped by the clamping component 21 to turn over to the other side to spray the polyurethane slurry. After the spraying is completed, the fixing component 22 drives the substrate sprayed with the slurry to be placed on the workbench for pressing for subsequent pressing operations. When spraying the slurry, the accumulation of polyurethane slurry on the first clamping teeth 111 and the second clamping teeth 121 of the clamping arm 1 can be reduced. When the substrate sprayed with the slurry is placed on a pressing workbench, the accumulation of slurry on the first clamping teeth 111 and the second clamping teeth 121 can be avoided from sticking to the substrate, thereby avoiding the position of the substrate placed on the workbench from being offset.

[0041] like Figure 2-3 As shown, the clamp arm 1 is used to clamp the substrate so as to spray the slurry on the substrate. The clamp arm 1 includes: an outer tube 11 and an inner tube 12. The wall of the outer tube 11 is fixed with a plurality of first clamping teeth 111 arranged at intervals along the axial direction of the outer tube 11; the inner tube 12 is inserted into the outer tube 11, and the wall of the inner tube 12 is fixed with a plurality of second clamping teeth 121 extending out of the outer tube 11 and cooperating with the first clamping teeth 111; the inner tube 12 is rotatably connected to the outer tube 11, so that the first clamping teeth 111 and the second clamping teeth 121 move toward each other to clamp the substrate, or move away from each other to release the substrate; the outer walls of the first clamping teeth 111 and the second clamping teeth 121 are both covered with a first anti-sticking layer 13, and the thickness of the first anti-sticking layer 13 is 1-3mm.

[0042] Since the first anti-sticking layer 13 is coated on the outer walls of the first clamping teeth 111 and the second clamping teeth 121, the first anti-sticking layer 13 is not sticky to the polyurethane slurry. In the process of spraying the polyurethane slurry on the substrate, the polyurethane slurry will not stick to the first anti-sticking layer 13, thereby avoiding the accumulation of the polyurethane slurry on the first clamping teeth 111 and the second clamping teeth 121, thereby alleviating the problem that the slurry is embedded in the clamping teeth and is difficult to clean; at the same time, since the thickness of the thin substrate (≤5mm) is too small, a gap may appear between the upper and lower clamping teeth when the clamping teeth are clamped, resulting in unstable clamping of the thin substrate (≤5mm). In the present application, since the first clamping teeth 111 and the second clamping teeth 121 are coated with the first anti-sticking layer 13 of a certain thickness, when clamping the thin substrate (≤5mm), the gap that may exist between the contact surfaces of the first clamping teeth 111 and the second clamping teeth 121 can be reduced, so that the clamping of the thin substrate (≤5mm) can be more reliable and not easy to fall off.

[0043] As an example, the thickness of the first anti-adhesive layer 13 may be, but is not limited to, 1 mm, 1.5 mm, 2 mm, 2.5 mm, or 3 mm.

[0044] Furthermore, the hardness of the first anti-adhesive layer 13 is 60-80 kgf / mm 2 As an example, the hardness of the first anti-adhesive layer 13 may be, but is not limited to, 60 kgf / mm 2 、65kgf / mm 2 、70kgf / mm 2 、75kgf / mm 2 、80kgf / mm 2 By setting the first anti-adhesive layer 13 to a suitable thickness, it is prevented that the first anti-adhesive layer 13 is too soft and has insufficient supporting force when clamping the substrate, thereby preventing the substrate from being clamped unsteadily.

[0045] In a possible implementation, the first anti-adhesive layer 13 may be made of, but not limited to, silicone or rubber materials, which are not sticky to the polyurethane slurry and have a certain hardness and resilience, so as to more stably clamp the thin substrate.

[0046] In some embodiments, a baffle 14 is provided on one side of the outer tube 11, so that the first clamping teeth 111 and the second clamping teeth 121 are located on the same side of the baffle 14, the length direction of the baffle 14 extends along the axial direction of the outer tube 11, and the end of the baffle 14 away from the outer tube 11 in the width direction is connected to the first clamping teeth 111. The baffle 14 is provided on one side of the outer tube 11, and in the process of spraying the polyurethane slurry on the substrate, the baffle 14 can further block the polyurethane slurry, reduce the accumulation of the polyurethane slurry on the first clamping teeth 111 and the second clamping teeth 121, and after the baffle 14 blocks the polyurethane slurry, the polyurethane slurry on the baffle 14 is also easier to clean.

[0047] Furthermore, the baffle 14 is detachably connected to the outer tube 11 and the first clamping teeth 111. After spraying the slurry, if the slurry on the baffle 14 is inconvenient to clean, the baffle 14 can be removed to clean the slurry on the baffle 14, which is also convenient for cleaning the slurry on the first clamping teeth 111 and the second clamping teeth 121 after the baffle 14 is removed. As an example, one end of the baffle 14 in the width direction is screwed to the outer tube 11, and the end of the baffle 14 in the width direction away from the outer tube 11 is overlapped on the first clamping teeth 111.

[0048] In some embodiments, the first clamping tooth 111 includes a connecting plate 1111 and a clamping plate 1112 connected to each other, one end of the connecting plate 1111 away from the clamping plate 1112 is connected to the outer tube 11, and the baffle 14 is connected to the connection between the connecting plate 1111 and the clamping plate 1112, and the width direction of the baffle 14 extends beyond the connection by 20-30 mm. As an example, the width direction extension of the baffle 14 can be, but is not limited to, 20 mm, 22 mm, 25 mm, 28 mm, and 30 mm beyond the connection. The width direction extension of the baffle 14 exceeds the connection by a suitable length, which can further shield the first clamping tooth 111 and the second clamping tooth 121, further reduce the accumulation of polyurethane slurry on the first clamping tooth 111 and the second clamping tooth 121, and avoid the excessive length from contacting the clamped substrate, thereby avoiding damage to the substrate.

[0049] In some embodiments, the angle between the extension direction of the baffle 14 and the extension direction of the connecting plate 1111 is 30-60°. As an example, the angle between the extension direction of the baffle 14 and the extension direction of the connecting plate 1111 can be, but is not limited to, 30°, 35°, 40°, 45°, 50°, 55°, 60°. The extension direction of the baffle 14 is set to form a suitable angle with the extension direction of the connecting plate 1111. On the one hand, the first clamping teeth 111 and the second clamping teeth 121 can be better shielded, and on the other hand, the subsequent convenient cleaning of the polyurethane slurry accumulated on the baffle 14 is facilitated. In some embodiments, the outer wall of the baffle 14 is provided with a second anti-sticking layer 15, and the thickness of the second anti-sticking layer 15 is 1-3mm. The second anti-sticking layer 15 is provided on the outer wall of the baffle 14, and the polyurethane slurry will not stick to the second anti-sticking layer 15, which can further facilitate the cleaning of the polyurethane slurry on the baffle 14.

[0050] As an example, the second anti-sticking layer 15 can be, but is not limited to, Teflon tape, a release agent, or butter. These materials are not sticky to the polyurethane slurry, can reduce the accumulation of the polyurethane slurry, and are relatively smooth, which is conducive to cleaning the polyurethane slurry.

[0051] Further, the thickness of the baffle 14 is 1-3 mm. As an example, the thickness of the baffle 14 can be, but is not limited to, 1 mm, 1.5 mm, 2 mm, 2.5 mm, and 3 mm. The thickness of the baffle 14 is not large, which can block the polyurethane slurry and avoid adding too much weight.

[0052] In some embodiments, the first clamping teeth 111 and the second clamping teeth 121 both include wide clamping teeth and narrow clamping teeth arranged at intervals. Along the axial direction of the outer tube 11, the width of the wide clamping teeth is 2-3 times the width of the narrow clamping teeth; the width of the narrow clamping teeth is not less than 100 mm. Narrow clamping teeth of a certain width are arranged, and wide clamping teeth with a width of 2-3 times the width of the narrow clamping teeth are arranged at intervals with the narrow clamping teeth, so that the clamping of the substrate is more stable and reliable, and the risk of wrinkles during the substrate flipping process is greatly reduced. As an example, the width of the narrow clamping teeth can be, but not limited to, 100 mm, 110 mm, and 120 mm. Correspondingly, the width of the wide clamping teeth can be, but not limited to, 200 mm, 220 mm, 250 mm, 260 mm, 280 mm, 300 mm, 320 mm, 350 mm, and 360 mm.

[0053] In some embodiments, along the axial direction of the outer tube 11, two adjacent first clamping teeth 111 are distributed at equal intervals, and two adjacent second clamping teeth 121 are distributed at equal intervals. Further, the spacing between two adjacent first clamping teeth 111 or the spacing between two adjacent second clamping teeth 121 is 100-200mm. As an example, the spacing between two adjacent first clamping teeth 111 or the spacing between two adjacent second clamping teeth 121 can be, but not limited to, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm. By setting the two adjacent first clamping teeth 111 to be distributed at equal intervals, the two adjacent second clamping teeth 121 to be distributed at equal intervals, and setting a suitable distance between the two adjacent clamping teeth, it is helpful for the first clamping teeth 111 and the second clamping teeth 121 to further stably and reliably clamp the substrate.

[0054] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A clamping arm for clamping a substrate so as to spray a slurry on the substrate, characterized in that: include: An outer tube, wherein a plurality of first clamping teeth are fixed to the outer tube wall and arranged at intervals along the axial direction of the outer tube; An inner tube, the inner tube is inserted into the outer tube, and a plurality of second clamping teeth extending out of the outer tube and cooperating with the first clamping teeth are fixed to the inner tube wall; the inner tube is rotatably connected to the outer tube, so that the first clamping teeth and the second clamping teeth move toward each other to clamp the substrate, or move away from each other to release the substrate; The outer walls of the first clamping teeth and the second clamping teeth are both covered with a first anti-sticking layer, and the thickness of the first anti-sticking layer is 1-3 mm.

2. The clamp arm according to claim 1, characterized in that: The hardness of the first anti-sticking layer is 60-80 kgf / mm 2 .

3. The clamp arm according to claim 1, characterized in that: A baffle is provided on one side of the outer tube so that the first clamping tooth and the second clamping tooth are located on the same side of the baffle, the length direction of the baffle extends along the axial direction of the outer tube, and one end of the baffle away from the outer tube in the width direction is connected to the first clamping tooth.

4. The clamp arm according to claim 3, characterized in that: The first clamping teeth include a connecting plate and a clamping plate connected to each other, one end of the connecting plate away from the clamping plate is connected to the outer tube, the baffle is connected to the connection between the connecting plate and the clamping plate, and the width direction of the baffle extends beyond the connection by 20-30 mm.

5. The clamp arm according to claim 4, characterized in that: The included angle between the extending direction of the baffle and the extending direction of the connecting plate is 30-60°.

6. The clamp arm according to any one of claims 3 to 5, characterized in that: The outer wall of the baffle is provided with a second anti-sticking layer, and the thickness of the second anti-sticking layer is 1-3 mm.

7. The clamp arm according to any one of claims 1 to 3, characterized in that: The first clamping teeth and the second clamping teeth both include wide clamping teeth and narrow clamping teeth that are spaced apart. Along the axial direction of the outer tube, the width of the wide clamping teeth is 2-3 times the width of the narrow clamping teeth; the width of the narrow clamping teeth is not less than 100 mm.

8. The clamp arm according to claim 7, characterized in that: Along the axial direction of the outer tube, two adjacent first clamping teeth are distributed at equal intervals, and two adjacent second clamping teeth are distributed at equal intervals.

9. A clamping device, characterized in that: include: A clamping assembly, the clamping assembly comprising two clamping arms according to any one of claims 1 to 8, the two clamping arms being used to fix opposite ends of the substrate respectively; A fixing assembly is used to fix the clamping assembly and drive the clamping assembly to move and rotate.

10. The clamping device according to claim 9, characterized in that: The clamping assembly further comprises a driving member, wherein the driving member is connected to the outer tube or the inner tube of the clamping arm, and the driving member is used for driving the outer tube and the inner tube to rotate relative to each other.

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