Cylindrical bending tester suitable for paint film

Abstract

The invention discloses a cylinder bending tester suitable for a paint film, and relates to the technical field of paint detection. Comprising a shell which is provided with two mounting holes which are symmetrically distributed; the driving wheel is arranged on the shell, the driving wheel is fixedly connected with a torque connecting rod, the torque connecting rod is fixedly connected with a driven wheel, and the driving wheel and the driven wheel are each provided with an annularly-distributed arc-shaped groove; the two positioning wheels are slidably connected to the interiors of the adjacent mounting holes correspondingly, and guide grooves with the number being half of the number of the arc-shaped grooves are formed in the positioning wheels; the number of the supporting rods is half of that of the arc-shaped grooves, and the supporting rods are connected between the two corresponding guide grooves in the different positioning wheels in a sliding mode. Through relative movement of the arc-shaped grooves and the guide grooves, the multiple supporting rods are controlled to move at the same time and enclose a cylinder, shaft bars with different diameters are replaced, an aluminum plate is supported, the frequency of replacing the shaft bars is reduced, and the test efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coating detection, and particularly to a cylindrical bending tester applicable to paint films. Background Art

[0002] A cylindrical bending tester for paint films is an instrument used to determine the flexibility of the coating films formed by color paints and varnishes. Its results are one of the main indicators for measuring the performance of coatings and have great reference value for the selection and application of coating varieties. During the process of testing coatings with the tester, first, the coating needs to be applied on the surface of an aluminum plate to form a coating film. Then, multiple aluminum plates with the same coating film are bent 180° around different diameter mandrels with diameters decreasing from large to small. Subsequently, the state of the coating film at the bent part of the aluminum plate is observed. Based on whether the coating film on the surface of the bent part of the aluminum plate cracks, the flexibility of the coating is judged, and the mandrel diameter at which the coating film first cracks or peels off is recorded. After bending the aluminum plate around the mandrel, the mandrel needs to be removed first before the aluminum plate can be removed for observation. Then, a mandrel with a smaller diameter is reinstalled and the coating film on the new aluminum plate is tested. This makes it necessary to frequently replace the mandrel during the test process, resulting in low test efficiency. Summary of the Invention

[0003] The present invention provides a cylindrical bending tester applicable to paint films to overcome the drawback that the existing cylindrical bending tester for paint films requires frequent replacement of the mandrel, resulting in low test efficiency.

[0004] The technical solution is as follows: A cylindrical bending tester applicable to paint films includes: a housing, a swinging member rotatably connected to the housing, an adjusting member provided on the swinging member, a support plate provided inside the housing, a rotating wheel member installed on the housing, and two symmetrically distributed mounting holes provided on the housing, and the center of the mounting hole is located on the swinging axis of the swinging member; a driving wheel provided on the housing, a torque connecting rod fixedly connected to the driving wheel, a driven wheel fixedly connected to the torque connecting rod, and annularly distributed arc-shaped grooves provided on both the driving wheel and the driven wheel; two positioning wheels respectively slidably connected in adjacent mounting holes, the torque connecting rod passing through the two positioning wheels, guiding grooves equal to half the number of the arc-shaped grooves provided on the positioning wheels, and a fixed connecting rod fixedly connected by the two positioning wheels; support rods, the number of which is half of the arc-shaped grooves, respectively slidably connected between two corresponding guiding grooves on different positioning wheels, and the support rods are slidably connected to the adjacent arc-shaped grooves.

[0005] Furthermore, it further includes: a storage shaft rotatably connected between the two positioning wheels, a first torsion spring fixedly connected between the storage shaft and the adjacent positioning wheel, an elastic sheet wound around the storage shaft, and the elastic sheet is fixedly connected to one of the support rods close to the rotating wheel member and is in contact with the remaining support rods.

[0006] Further, a limiting post is fixedly connected to the positioning wheel on one side, and an installation groove is arranged on the installation hole near the side of the limiting post. The limiting post is in limiting cooperation with the installation groove.

[0007] Further, the elastic coefficient of the elastic piece is smaller than the elastic coefficient of the first torsion spring between the storage shaft and the positioning wheel.

[0008] Further, it further includes: a trigger member, rotatably connected to the torque link, the trigger member passes through the storage shaft and is rotatably and slidably connected thereto, the positioning wheel is in spline connection with the trigger member, and the driving wheel contacts the trigger member; two installation rings, respectively slidably connected within the adjacent positioning wheels, a spring is fixedly connected between the trigger member and the installation ring near the driving wheel; a limiting block, fixedly connected to the trigger member, a plurality of limiting grooves are arranged on the storage shaft and are all in limiting cooperation with the limiting block; an extrusion post, fixedly connected to the trigger member, the driving wheel is provided with a plurality of limiting holes, and the limiting holes are in limiting cooperation with the extrusion post; an adjusting wheel, rotatably connected to the driving wheel, a second torsion spring is fixedly connected between the driving wheel and the adjusting wheel, the driving wheel is fixedly connected with a fixed arc block, the adjusting wheel is fixedly connected with a moving arc block that is in extrusion cooperation with the fixed arc block, and an extrusion groove for extruding and cooperating with the extrusion post is arranged inside the adjusting wheel.

[0009] Further, the depth of the extrusion groove is equal to the length of the limiting groove.

[0010] Further, the magnitude of the central angle corresponding to the extrusion groove is equal to the central angle corresponding to the arc where all the limiting holes are located.

[0011] Further, it further includes: a support member, the number of which is two less than the number of the arc-shaped grooves. All the support members are divided into two groups, and the two groups of support members are respectively slidably connected to the adjacent positioning wheels and are fixedly connected to the adjacent installation rings. The installation ring near the driving wheel is connected to the trigger member through a pull rope, the installation ring near the driven wheel is fixedly connected to the trigger member, and a plurality of arc-shaped support portions are arranged on the support member, and the arc-shaped support portions are in contact and cooperation with the elastic piece.

[0012] Further, an extrusion inclined surface is arranged on the side of the arc-shaped support portion away from the central axis of the trigger member, and the extrusion inclined surface is in extrusion cooperation with the elastic piece.

[0013] Further, the distance between the roots of the two corresponding arc-shaped support portions on different installation rings is equal to the width of the elastic piece.

[0014] The advantages and positive effects of the present invention compared with the prior art are as follows: By the relative movement of the arc-shaped groove and the guiding groove, the present invention controls the simultaneous movement of multiple support rods to form a cylinder, replaces axle rods of different diameters, and provides support for the aluminum plate, reducing the number of times of replacing axle rods and improving the test efficiency; the elasticity of the elastic sheet itself makes the "axle rod" formed by all the support rods more round and closer to reality; the trigger member, the limit block and the extrusion column are used to lock the positions of the driving wheel and the storage shaft, preventing the misalignment of the positions of the support rod and the elastic sheet during the process of bending the aluminum plate, which may cause a change in the actual bending diameter of the aluminum plate; relying on the arc-shaped support portion to provide support for the elastic sheet, maintaining the arc of the elastic sheet between two adjacent support rods, and at the same time providing support for both sides of the elastic sheet to prevent the elastic sheet from deforming under the extrusion of the aluminum plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic three-dimensional structure diagram of the present invention;

[0016] Figure 2 is a schematic cross-sectional view of the three-dimensional structure of the housing, the driving wheel and the positioning wheel of the present invention;

[0017] Figure 3 is an exploded view of the housing, the driven wheel and the adjusting wheel of the present invention;

[0018] Figure 4 is an exploded view of the driving wheel, the storage shaft and the trigger member of the present invention;

[0019] Figure 5 is a schematic three-dimensional structure diagram of the driving wheel, the torque link and the positioning wheel of the present invention;

[0020] Figure 6 is a schematic cross-sectional view of the three-dimensional structure of the fixed link, the support rod and the elastic sheet of the present invention;

[0021] Figure 7 is a schematic cross-sectional view of the three-dimensional structure of the driving wheel, the positioning wheel and the storage shaft of the present invention;

[0022] Figure 8 is a schematic three-dimensional structure diagram of the torque link, the storage shaft and the trigger member of the present invention;

[0023] Figure 9 is a schematic three-dimensional structure diagram of the driving wheel, the trigger member and the adjusting wheel of the present invention;

[0024] Figure 10 is a schematic three-dimensional structure diagram of the driving wheel, the extrusion column and the adjusting wheel of the present invention;

[0025] Figure 11 is a schematic three-dimensional structure diagram of the trigger member, the mounting ring and the support member of the present invention.

[0026] Reference numerals of the drawings: 1 - housing, 2 - swing member, 201 - mounting hole, 3 - adjusting member, 4 - support plate, 5 - runner member, 6 - driving wheel, 601 - arc-shaped groove, 7 - torque link, 8 - driven wheel, 9 - positioning wheel, 901 - guiding groove, 10 - fixed link, 11 - storage shaft, 12 - support rod, 13 - elastic sheet, 14 - limiting post, 141 - mounting groove, 15 - triggering member, 16 - mounting ring, 17 - limiting block, 171 - limiting groove, 18 - pressing post, 181 - limiting hole, 182 - pressing groove, 19 - adjusting wheel, 20 - fixed arc block, 21 - movable arc block, 22 - support member, 221 - arc-shaped support portion, 222 - pressing inclined surface. Detailed implementation mode

[0027] Other features and advantages of the present invention will be described in the following specification, and in part will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained by the structures pointed out in the specification and drawings.

[0028] A cylindrical bending tester applicable to paint films, see Figures 1-8 , comprising: a housing 1, a swing member 2 is rotatably connected to the housing 1, an adjusting member 3 is arranged on the swing member 2, a support plate 4 is arranged inside the housing 1, a runner member 5 is mounted on the housing 1, two symmetrically distributed mounting holes 201 are arranged on the housing 1, and the center of the mounting hole 201 is located on the swing axis of the swing member 2; a driving wheel 6, arranged on the housing 1, the driving wheel 6 is fixedly connected with a torque link 7, the torque link 7 is fixedly connected with a driven wheel 8, and annularly distributed arc-shaped grooves 601 are arranged on both the driving wheel 6 and the driven wheel 8; two positioning wheels 9, respectively slidably connected in adjacent mounting holes 201, the torque link 7 passes through the two positioning wheels 9, the positioning wheels 9 are provided with guiding grooves 901 which are half the number of the arc-shaped grooves 601, and the two positioning wheels 9 are jointly fixedly connected with a fixed link 10; support rods 12, the number of which is half of the arc-shaped grooves 601, are respectively slidably connected between two corresponding guiding grooves 901 on different positioning wheels 9, and the support rods 12 are slidably connected with the adjacent arc-shaped grooves 601.

[0029] In the above solution, it aims to solve the problem that during the cylindrical bending test of the paint film, the mandrel needs to be frequently replaced, resulting in low test efficiency. In this solution, the relative movement of the arc-shaped groove 601 and the guiding groove 901 is used to control the simultaneous movement of multiple support rods 12 to form a cylinder, replacing the mandrel to provide support for the aluminum plate, reducing the number of mandrel replacements, and improving the test efficiency. The swinging member 2 is an existing part, and its overall shape is U-shaped. The left part of the swinging member 2 includes a pressing roller for pushing the aluminum plate. The adjusting member 3 is an existing part, which is used to adjust the position of the pressing roller on the swinging member 2 so that after the aluminum plate is placed, the pressing roller is adjusted to a state of contacting the lower side of the aluminum plate. The support plate 4 is an existing part, which includes a rectangular plate and a rectangular strip. The rectangular strip is connected to the upper side of the rectangular plate by bolts. When placing the aluminum plate, the aluminum plate is placed between the rectangular plate and the rectangular strip, and the distance between the rectangular plate and the rectangular strip is reduced by tightening the bolts to clamp and fix the aluminum plate. The rotating wheel member 5 is an existing part, which is used to control the swinging of the support plate 4 so that the support plate 4 drives the upper side of the aluminum plate to contact the mandrel. The number of the arc-shaped groove 601 and the support rods 12 can be set according to the diameter of the mandrel to be replaced. In this solution, the number of both the arc-shaped groove 601 and the support rods 12 is six.

[0030] See Figures 3-7 , further including: a storage shaft 11, rotatably connected between two positioning wheels 9. A first torsion spring is fixedly connected between the storage shaft 11 and the adjacent positioning wheel 9. An elastic sheet 13 is wound around the storage shaft 11. The elastic sheet 13 is fixedly connected to one support rod 12 close to the rotating wheel member 5 and is in contact with the remaining support rods 12. The elastic coefficient of the elastic sheet 13 is smaller than that of the first torsion spring between the storage shaft 11 and the positioning wheel 9.

[0031] In the above solution, it aims to make the "mandrel" formed by all the support rods 12 more rounded by using the elasticity of the elastic sheet 13 itself. The material of the elastic sheet 13 is the same as that of the spring. The elastic sheet 13 can form an arc at the gap between two adjacent support rods 12 under the action of its own elasticity. During the 180° bending process of the aluminum plate, it cannot contact the left side of the "mandrel", so that the elastic sheet 13 passes through the gap between the two support rods 12 on the left side and winds around all the support rods 12 for one week, and then the elastic sheet 13 is fixedly connected to the support rod 12 on the upper left side. In this way, the elastic sheet 13 is not "installed" between the two support rods 12 on the left side and does not affect the elastic sheet 13 to provide support for the aluminum plate. The pulling force of the first torsion spring on the elastic sheet 13 through the storage shaft 11 is used to make the elastic sheet 13 closely adhere to the surface of the support rod 12. The elastic sheet 13 and the support rods 12 can both be coated with a Teflon coating, which can enhance the surface smoothness and wear resistance of the elastic sheet 13 and the support rods 12 and reduce the friction between the support rods 12 and the elastic sheet 13.

[0032] See Figures 2-5, a limiting post 14 is fixedly connected to the positioning wheel 9 on one side, an installation groove 141 is arranged on the installation hole 201 near the limiting post 14, and the limiting post 14 is in limiting cooperation with the installation groove 141.

[0033] In the above solution, it is intended to prevent the tester from turning the part of the elastic sheet 13 that does not wrap the support rod 12 (i.e., the position where the elastic sheet 13 passes through two adjacent support rods 12) to the right through the cooperation of the limiting post 14 and the installation groove 141, so as to prevent errors during the installation by the tester. Figure 6 In the middle, prevent errors during installation by the tester.

[0034] See Figures 3-9 , further comprising: a trigger member 15, rotatably connected to the torque link 7, the trigger member 15 passes through the storage shaft 11 and is rotatably and slidably connected thereto, the positioning wheel 9 is splined to the trigger member 15, and the driving wheel 6 contacts the trigger member 15; two mounting rings 16, respectively slidably connected within the adjacent positioning wheels 9, a spring is fixedly connected between the trigger member 15 and the mounting ring 16 near the driving wheel 6; a limiting block 17, fixedly connected to the trigger member 15, a plurality of limiting grooves 171 are arranged on the storage shaft 11 and are all in limiting cooperation with the limiting block 17; an extrusion post 18, fixedly connected to the trigger member 15, the driving wheel 6 is provided with arc-shaped distributed limiting holes 181, and the limiting holes 181 are in limiting cooperation with the extrusion post 18; an adjusting wheel 19, rotatably connected to the driving wheel 6, a second torsion spring is fixedly connected between the driving wheel 6 and the adjusting wheel 19, the driving wheel 6 is fixedly connected with a fixed arc block 20, the adjusting wheel 19 is fixedly connected with a moving arc block 21 that is in extrusion cooperation with the fixed arc block 20, and an extrusion groove 182 that is in extrusion cooperation with the extrusion post 18 is arranged inside the adjusting wheel 19; the depth of the extrusion groove 182 is equal to the length of the limiting groove 171; the size of the central angle corresponding to the extrusion groove 182 is equal to the central angle corresponding to the arc where all the limiting holes 181 are located.

[0035] In the above solution, it is aimed to lock the positions of the driving wheel 6 and the storage shaft 11 by using the trigger 15, the limit block 17 and the extrusion column 18, so as to prevent the positions of the support rod 12 and the elastic sheet 13 from being misaligned during the process of bending the aluminum plate, which may cause the actual bending diameter of the aluminum plate to change; the positioning wheel 9 is in a static state under the action of the limit post 14, and the trigger 15 does not rotate under the spline action of the positioning wheel 9; the number of the limit grooves 171 and the limit holes 181 is determined according to the number of different specifications of shaft rods that the device can replace. In this solution, the number of the limit grooves 171 and the limit holes 181 is seven each. The device can replace six specifications of connected shaft rods. At the same time, the position of the limit groove 171 is determined according to the thickness of the elastic sheet 13, the number of turns of the elastic sheet 13 wound on the storage shaft 11 and the diameter of the storage shaft 11. When the tester adjusts the support rod 12 to the specified diameter, the support rod 12 on the upper left side pulls the elastic sheet 13 to move, so that the elastic sheet 13 is gradually released from the storage shaft 11 and drives the storage shaft 11 to rotate. When the diameter of the "shaft rod" formed by all the support rods 12 is the same as the diameter of the replaced shaft rod, the elastic sheet 13 and the storage shaft 11 stop moving. At this time, the limit block 17 just corresponds to the adjacent limit groove 171, that is, the limit grooves 171 are not distributed in an annular equidistant state.

[0036] The seven limit holes 181 are distributed in an arc shape, and the central angle corresponding to the arc where the seven limit holes 181 are located is equal to the central angle corresponding to the single arc groove 601 with the point on the central axis of the driving wheel 6 as the center of the circle; the central angle corresponding to the dead zone between the fixed arc block 20 and the moving arc block 21 is equal to the central angle corresponding to the extrusion groove 182, which is used to first squeeze the extrusion column 18 through the extrusion groove 182 when the adjusting wheel 19 rotates, and then the adjusting wheel 19 can drive the driving wheel 6 to rotate through the cooperation of the fixed arc block 20 and the moving arc block 21; both ends of the extrusion groove 182 are inclined surfaces for squeezing the extrusion column 18; the front end of the extrusion column 18 is hemispherical, which is convenient for the limit hole 181 to squeeze the extrusion column 18 to move.

[0037] See Figures 2-4 、 Figure 6 、 Figure 7 and Figure 11, further comprising: support members 22, the number of which is two less than the number of arc-shaped grooves 601. All the support members 22 are divided into two groups, and the two groups of support members 22 are respectively slidably connected to adjacent positioning wheels 9 and fixedly connected to adjacent mounting rings 16. A pull rope is connected between the mounting ring 16 close to the driving wheel 6 and the trigger member 15, and the mounting ring 16 close to the driven wheel 8 is fixedly connected to the trigger member 15. A plurality of arc-shaped support portions 221 are provided on the support members 22, and the arc-shaped support portions 221 are in contact and cooperation with the elastic piece 13; an extrusion inclined surface 222 is provided on one side of the arc-shaped support portion 221 away from the central axis of the trigger member 15, and the extrusion inclined surface 222 is in extrusion cooperation with the elastic piece 13; the distance between the roots of the two corresponding arc-shaped support portions 221 on different mounting rings 16 is equal to the width of the elastic piece 13.

[0038] In the above solution, it is intended to rely on the arc-shaped support portion 221 to provide support for the elastic piece 13, maintain the arc of the elastic piece 13 between two adjacent support rods 12, and at the same time provide support for both sides of the elastic piece 13 to prevent the elastic piece 13 from deforming under the extrusion of the aluminum plate; the support member 22 is located in the gap between two adjacent support rods 12 to provide support for the elastic piece 13 "built" between two adjacent support rods 12; the pull rope between the mounting ring 16 and the trigger member 15 contacts the adjacent positioning wheel 9 (please refer to the attachment Figure 11 ). The number of support members 22 can be adjusted according to the number of support rods 12. In this solution, the number of support members 22 is ten; the number of arc-shaped support portions 221 on a single support member 22 can be determined according to the number of different specifications of shaft rods that the device can replace. In this solution, the number of arc-shaped support portions 221 on a single support member 22 is six, and at the same time, the outer diameter of the arc-shaped support portion 221 is equal to the diameter of the replaced shaft rod; the extrusion inclined surface 222 is used to extrude the front and rear sides of the elastic piece 13 and guide the elastic piece 13 into the required arc; the roots of the arc-shaped support portion 221 can resist both sides of the elastic piece 13, further reducing the probability of the elastic piece 13 deforming under extrusion.

[0039] The working principle of the above solution is as follows: When it is necessary to test the flexibility of the coating, the tester places the aluminum plate with the coating film on the support plate 4 from right to left, and then fixes the aluminum plate with the rectangular plate on the support plate 4. At this time, the tester rotates the adjusting wheel 19 counterclockwise. The adjusting wheel 19 drives the extrusion groove 182 and the moving arc block 21 to rotate together, and twists the second torsion spring. The extrusion groove 182 moves relative to the extrusion post 18. Finally, the extrusion post 18 moves to the end of the extrusion groove 182. As the adjusting wheel 19 continues to rotate, the extrusion groove 182 squeezes the extrusion post 18 backward. The extrusion post 18 drives the trigger member 15 and the limiting block 17 to move backward, and makes the limiting block 17 disengage from the adjacent limiting groove 171, releasing the limitation of the limiting block 17 on the storage shaft 11. While the trigger member 15 moves backward, the trigger member 15 drives the rear mounting ring 16 to move backward, and drives the front mounting ring 16 to move forward through the pull rope. The mounting rings 16 and the trigger member 15 compress the adjacent springs together. The two mounting rings 16 drive the supporting members 22 thereon to move together, so that the distance between the corresponding two supporting members 22 is greater than the width of the elastic piece 13.

[0040] When the extrusion post 18 is completely removed from the extrusion groove 182, the moving arc block 21 contacts the fixed arc block 20. Subsequently, the adjusting wheel 19 drives the driving wheel 6 to rotate through the fixed arc block 20 and the moving arc block 21. The driving wheel 6 drives the limiting hole 181 to rotate. The limiting hole 181 squeezes the extrusion post 18 backward, releasing the limitation of the extrusion post 18 on the driving wheel 6. As the driving wheel 6 rotates, the driving wheel 6 drives the driven wheel 8 to rotate together through the torque connecting rod 7. The arc grooves 601 on the driving wheel 6 and the driven wheel 8 squeeze the adjacent support rods 12 together, causing the support rods 12 to move away from the torque connecting rod 7. The diameter of the cylinder formed by all the support rods 12 increases. At the same time, the support rod 12 on the upper left side pulls the elastic sheet 13 to move. Until the diameter of the cylinder formed by all the support rods 12 reaches the required diameter, stop rotating the adjusting wheel 19. At this time, the extrusion post 18 corresponds to the adjacent limiting hole 181. The extrusion post 18, the trigger 15 and the limiting block 17 move forward under the action of the spring, so that the extrusion post 18 enters the adjacent limiting hole 181. Subsequently, the tester releases the adjusting wheel 19. The adjusting wheel 19 rotates clockwise under the action of the second torsion spring and resets relative to the driving wheel 6. Finally, the extrusion post 18 corresponds to the extrusion groove 182 again. At this time, the trigger 15 continues to move forward under the action of the spring. The trigger 15 drives the extrusion post 18 to re-enter the extrusion groove 182. At the same time, the trigger 15 drives the limiting block 17 to enter the corresponding limiting groove 171 to limit the storage shaft 11. At the same time, the trigger 15 drives the rear mounting ring 16 to move forward and reset. The front mounting ring 16 moves backward and resets under the action of the spring. The mounting ring 16 drives the adjacent support member 22 to move. The arc-shaped support portion 221 contacts the elastic sheet 13 and completes the support of its inner side. Thus, the adjustment work ends. The tester rotates the swinging member 2. The extrusion roller on the swinging member 2 squeezes the aluminum plate to bend 180° around all the support rods 12. Subsequently, the tester observes the state of the coating film on the surface of the aluminum plate and adjusts the diameter of the cylinder formed by all the support rods 12. Replace the new aluminum plate and retest until the coating film of the aluminum plate cracks to obtain the test result.

[0041] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A cylindrical bending tester suitable for paint film, characterized in that: include: A housing (1), the housing (1) being rotatably connected to a swinging member (2), the swinging member (2) being provided with an adjusting member (3), a supporting plate (4) being provided inside the housing (1), a rotating wheel member (5) being installed on the housing (1), two symmetrically distributed mounting holes (201) being provided on the housing (1), and the centers of the mounting holes (201) being located on the swinging axis of the swinging member (2); A driving wheel (6) is arranged on the housing (1), the driving wheel (6) is fixedly connected to a torque connecting rod (7), the torque connecting rod (7) is fixedly connected to a driven wheel (8), and both the driving wheel (6) and the driven wheel (8) are provided with annularly distributed arc grooves (601); Two positioning wheels (9) are respectively slidably connected in adjacent mounting holes (201); the torque connecting rod (7) passes through the two positioning wheels (9); the positioning wheels (9) are provided with guide grooves (901) having half the number of the arc-shaped grooves (601); and the two positioning wheels (9) are fixedly connected with a fixed connecting rod (10); The support rods (12), the number of which is half of the arc-shaped grooves (601), are respectively slidably connected between two corresponding guide grooves (901) on different positioning wheels (9), and the support rods (12) are slidably connected to adjacent arc-shaped grooves (601).

2. A cylindrical bending tester suitable for paint film according to claim 1, characterized in that include: A storage shaft (11) is rotatably connected between the two positioning wheels (9), a first torsion spring is fixedly connected between the storage shaft (11) and the adjacent positioning wheel (9), an elastic sheet (13) is wound around the storage shaft (11), and the elastic sheet (13) is fixedly connected to one of the support rods (12) close to the rotating wheel member (5) and fits with the other support rods (12).

3. A cylindrical bending tester suitable for paint film according to claim 1, characterized in that: A limiting column (14) is fixedly connected to the positioning wheel (9) on one side, and a mounting groove (141) is provided on the mounting hole (201) close to the limiting column (14), and the limiting column (14) is in limiting cooperation with the mounting groove (141).

4. A cylindrical bending tester suitable for paint film according to claim 2, characterized in that: The elastic coefficient of the elastic sheet (13) is smaller than the elastic coefficient of the first torsion spring between the storage shaft (11) and the positioning wheel (9).

5. The cylindrical bending tester suitable for paint film according to claim 3 is characterized in that include: A trigger member (15) is rotatably connected to the torque connecting rod (7), the trigger member (15) passes through the storage shaft (11) and is rotatably and slidably connected thereto, the positioning wheel (9) is spline-connected to the trigger member (15), and the driving wheel (6) is in contact with the trigger member (15); Two mounting rings (16) are respectively slidably connected in adjacent positioning wheels (9); a spring is fixedly connected between the trigger member (15) and the mounting ring (16) on the side close to the driving wheel (6); a limit block (17) is fixedly connected to the trigger member (15); a plurality of limit grooves (171) are arranged on the storage shaft (11) and are all limitedly matched with the limit blocks (17); The extrusion column (18) is fixedly connected to the trigger member (15), and the driving wheel (6) is provided with arc-shaped limiting holes (181), and the limiting holes (181) are limitedly matched with the extrusion column (18); The adjusting wheel (19) is rotatably connected to the driving wheel (6); a second torsion spring is fixedly connected between the driving wheel (6) and the adjusting wheel (19); the driving wheel (6) is fixedly connected to a fixed arc block (20); the adjusting wheel (19) is fixedly connected to a moving arc block (21) which is pressed and matched with the fixed arc block (20); and an extrusion groove (182) which is pressed and matched with the extrusion column (18) is provided in the adjusting wheel (19).

6. A cylindrical bending tester suitable for paint film according to claim 5, characterized in that: The depth of the extrusion groove (182) is equal to the length of the limiting groove (171).

7. The cylindrical bending tester suitable for paint film according to claim 5, characterized in that: The size of the central angle corresponding to the extrusion groove (182) is equal to the central angle corresponding to the arc line where all the limiting holes (181) are located.

8. The cylindrical bending tester suitable for paint film according to claim 5, characterized in that include: The number of the support members (22) is two less than the number of the arc-shaped grooves (601), and all the support members (22) are divided into two groups. The two groups of support members (22) are respectively slidably connected to the adjacent positioning wheels (9) and fixedly connected to the adjacent mounting rings (16). The mounting ring (16) on the side close to the driving wheel (6) is connected to the trigger member (15) by a pull rope, and the mounting ring (16) on the side close to the passive wheel (8) is fixedly connected to the trigger member (15). A plurality of arc-shaped support portions (221) are provided on the support members (22), and the arc-shaped support portions (221) are in contact with and cooperate with the elastic sheet (13).

9. A cylindrical bending tester suitable for paint film according to claim 8, characterized in that: An extrusion slope (222) is provided on one side of the arc-shaped support portion (221) away from the central axis of the trigger member (15), and the extrusion slope (222) is extruded and matched with the elastic sheet (13).

10. A cylindrical bending tester suitable for paint film according to claim 9, characterized in that: The distance between the roots of two corresponding arc-shaped support portions (221) on different mounting rings (16) is equal to the width of the elastic sheet (13).

Images