90-degree peeling test fixture for polyurethane roller

Abstract

The utility model discloses a polyurethane roller 90-degree peeling test fixture, which comprises a roller core, a first connector and a second connector, the first connector is provided with a concave accommodating cavity, a transverse limiting rod is arranged in the concave accommodating cavity, the roller core is sleeved on the transverse limiting rod, the second connector comprises an adapter and two clamping plates, and the two clamping plates are connected with the adapter. The two clamping plates are provided with locking rod bolt assemblies and lifting rods, one end of the adapter is arranged on the lifting rods in a sleeving mode, the other end of the adapter is provided with a second connecting part connected with a tensile machine, the first connector is further provided with a first connecting part connected with the tensile machine, and the surface of the wheel core is bonded with one end of a polyurethane test strip. And the other end of the polyurethane test strip is arranged between the two clamping plates and is clamped and fixed through a lock rod bolt assembly. The device is accurate in test data, wide in application range, high in universality, stable and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of polyurethane roller detection, in particular to a polyurethane roller 90-degree peeling test fixture. Background Art

[0002] The 90° peel test is a test method used to reflect the bonding condition between polyurethane and wheel core. The test is usually conducted using a tensile testing machine. Conventional methods usually use a rectangular metal plate and a polyurethane strip bonded together for testing. The length of the polyurethane strip is about twice that of the plywood. The protruding metal plate and one end of the polyurethane strip are clamped and installed on the tensile testing machine with a clamp. The polyurethane strip is usually fixed by the friction generated by extrusion.

[0003] The above technical solution has the following problems:

[0004] ① The peeling area between the polyurethane and the plywood is a plane, and the actual bonding between the wheel core and the polyurethane layer in the roller is an arc surface, which cannot truly reflect the bonding situation.

[0005] ② The fixture clamps the polyurethane sample through friction. Since the polyurethane is deformed by force during the peeling process and becomes thinner in the thickness direction, it is very easy to slip off.

[0006] ③ The opening range of the fixture is small, and testing is not possible when the polyurethane thickness is large. Summary of the invention

[0007] The technical problem to be solved by the utility model is to provide a polyurethane roller 90° peeling test fixture, which has accurate test data, wide application range, high versatility, stability and reliability.

[0008] In order to solve the above technical problems, the utility model provides a polyurethane roller 90° peeling test fixture, including a wheel core, a first connector and a second connector, the first connector is provided with a concave accommodating cavity, a transverse limit rod is provided in the concave accommodating cavity, the wheel core is sleeved on the transverse limit rod, the second connector includes an adapter and two clamps, a locking rod bolt assembly and a lifting rod are provided on the two clamps, one end of the adapter is sleeved on the lifting rod, and the other end is provided with a second connecting portion connected to a tensile testing machine, the first connector is also provided with a first connecting portion connected to the tensile testing machine, the surface of the wheel core is bonded to one end of a polyurethane test strip, the other end of the polyurethane test strip is arranged between the two clamps and is clamped and fixed by the locking rod bolt assembly.

[0009] Furthermore, a through hole is arranged on the polyurethane test strip between the two clamping plates, and the locking rod bolt assembly passes through the through hole.

[0010] Furthermore, the end of the screw of the locking rod bolt assembly is configured as a self-tapping portion, and at least one clamping plate surface corresponding to the locking rod bolt assembly is provided with an internal threaded column, and the screw of the locking rod bolt assembly is threadedly connected to the internal threaded column.

[0011] Furthermore, the first connector includes a first base plate, and two vertical plates are arranged in parallel on one surface of the first base plate. The two vertical plates cooperate with the base plate to form a concave accommodating cavity. The transverse limiting rod passes through the two vertical plates and is threadedly connected to the limiting nut. The first connecting part is arranged on the other surface of the first base plate.

[0012] Furthermore, a rough portion is provided on the surface of the clamping plate on one side of the polyurethane test strip.

[0013] Furthermore, the locking rod bolt assembly is composed of a screw rod, a first nut and a spring washer, and the lifting rod is composed of a screw and a second nut.

[0014] Furthermore, the adapter includes a second bottom plate, a hanging plate is arranged on one surface of the second bottom plate, a hanging hole is arranged on the hanging plate, and the second connecting portion is arranged on the other surface of the second bottom plate.

[0015] Furthermore, the number of the locking rod bolt assemblies is at least 2.

[0016] Beneficial effects of the utility model:

[0017] 1. By directly testing the polyurethane test strip on the surface of the wheel core, it can well reflect the actual bonding condition of the roller, the authenticity of the data is guaranteed, and the data accuracy is high;

[0018] 2. The polyurethane test strip is fixed by two splints, which is not easy to slip during testing;

[0019] 3. The two clamping plates can adapt to the clamping and fixing of polyurethane test strips of different thicknesses, and are not limited to the opening range, which greatly improves the versatility of the test;

[0020] 4. The concave accommodating cavity can meet the testing needs of products with different wheel surface widths, further improving versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 This utility model Figure 1 Schematic diagram of the cross-sectional structure;

[0023] Figure 3 It is a structural schematic diagram of the first connector of the utility model;

[0024] Figure 4 It is a structural schematic diagram of the second connector of the utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the second connector of the utility model adopting a self-tapping structure;

[0026] Figure 6 This is a schematic diagram of the structure of the first connector with positioning function of the utility model;

[0027] Figure 7 It is a schematic diagram that the connection part between the utility model and the tensile machine is a cylindrical structure. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0029] Reference Figures 1 to 4 As shown, an embodiment of the polyurethane roller 90° peeling test fixture of the utility model is used in conjunction with a tensile testing machine, and specifically includes a wheel core 1, a first connector 2, and a second connector 3. The wheel core is used to simulate a roller, and the wheel core is partially bonded to the polyurethane test strip. During the test, the first connector is used to fix the wheel core to simulate the actual arc surface bonding condition, and the second connector is used to fix the protruding part of the polyurethane test strip to achieve the purpose of test fixation;

[0030] A concave accommodating cavity is arranged on the first connector, and a transverse limiting rod 4 is arranged in the concave accommodating cavity. The wheel core is sleeved on the transverse limiting rod, and the wheel core can rotate circumferentially along the transverse limiting rod, but is restricted in the pulling direction. The second connector includes an adapter 5 and two clamps 6. A locking rod bolt assembly 7 and a lifting rod 8 are arranged on the two clamps. One end of the adapter is sleeved on the lifting rod to ensure the stability of the pulling force, and a second connecting part 9 connected to the tensile testing machine is arranged on the other end. The first connector is also provided with a first connecting part 10 connected to the tensile testing machine, so that the wheel core and the polyurethane test strip can be installed in the tensile testing machine. The surface of the wheel core is bonded to one end of the polyurethane test strip 11, and the other end of the polyurethane test strip is arranged between the two clamps and clamped and fixed by the locking rod bolt assembly. The method of clamping and fixing with two clamps does not have the problem of a small opening range, and the firmness after being locked and fixed by the locking rod bolt assembly is guaranteed, and there will be no slippage.

[0031] Specifically, the bonding method of the above-mentioned polyurethane test strip and the wheel core is as follows: the wheel core is sandblasted and cleaned, and then the glue is brushed. When brushing the glue, the adhesive is brushed on half of the circumferential direction, and the other half is brushed with a release agent, and the contact position between the release agent and the adhesive is marked, and then the polyurethane is poured. After the vulcanization is completed, the polyurethane layer is cut along the mark, so that half of the polyurethane test strip is bonded to the wheel core, and the other half is separated as the pulling end. The prepared test sample can be installed on the fixture, the wheel core sleeve is set on the transverse limit rod, the pulling end of the polyurethane test strip is clamped and fixed by two splints, and then the adapter is connected to the two splints to complete the assembly, and then the assembled fixture is installed in the tensile machine for tensile testing.

[0032] During the clamping and fixing process of the splint, in order to ensure that it has a good clamping effect, a perforation 12 is set on the polyurethane test strip located between the two splints. The perforation can be formed by pre-reserved holes on the mold, or by punching. The locking rod bolt assembly passes through the perforation, and the locking rod bolt assembly can squeeze the splint to form a clamping force, and can also form a movement limiting effect in the pulling direction on the polyurethane test strip. When the thickness of the polyurethane test strip decreases during the pulling process, the clamping force will also decrease. At this time, the locking rod bolt assembly limits the movement of the polyurethane test strip in the pulling direction, effectively avoiding the problem of slipping. A rough portion can also be set on the surface of the splint on one side of the polyurethane test strip. The rough portion can be a protrusion to improve the clamping effect. The number of locking rod bolt assemblies is at least 2 to ensure the stability of the fixation.

[0033] The first connector includes a first base plate 15, and two vertical plates 16 are arranged in parallel on one surface of the first base plate. The two vertical plates cooperate with the base plate to form a concave accommodating cavity. The transverse limit rod passes through the two vertical plates and is threadedly connected to the limit nut. The first connecting part is arranged on the other surface of the first base plate. The structure is simple and the preparation cost is low. The transverse limit rod is a detachable structure and can be formed by screws and nuts. The operation is convenient and reliable. The above-mentioned adapter includes a second base plate 17. A lifting plate 18 is arranged on one surface of the second base plate. The lifting plate is provided with a lifting hole for being sleeved on the lifting rod. The second connecting part is arranged on the other surface of the second base plate. The lifting plate and the first connecting part are arranged at 90 degrees to meet the different requirements of the lifting angle and the installation angle between the second connecting part and the tensile machine. The locking rod bolt assembly consists of a screw rod, a first nut and a spring washer. The structure is simple, and the spring washer can provide a better clamping and fixing effect. The lifting rod consists of a screw and a second nut, and the structure is simple.

[0034] Reference Figure 7 As shown, the first connection part and the second connection part can be cylindrical structures to match the connection of some tensile machines and achieve the effect of quick installation connection.

[0035] In one embodiment, referring to Figure 5As shown, the screw end of the locking rod bolt assembly is set as a self-tapping portion 13, and at least one clamping plate surface corresponding to the locking rod bolt assembly is provided with an internal threaded column 14. The screw of the locking rod bolt assembly is threadedly connected with the internal threaded column, and the screw with the self-tapping portion extends out from the internal threaded column, so that the polyurethane test strip can be directly drilled and then passed through another clamping plate. The installation and drilling are completed in one piece, avoiding the problem of mismatch in the hole position.

[0036] In one embodiment, the two vertical plates can be relatively moved and fixed on the first bottom plate, which can better meet the needs of wheel cores of different sizes. The specific structure of the two vertical plates being adjustable and mounted on the first bottom plate can be: an oblong hole is provided on the first bottom plate, and the vertical plate is an L-shaped structure, which is locked and matched with the oblong hole to achieve the purpose of adjustment. Figure 6 As shown, the present application also discloses a structure that meets the adjustment requirements. The spacing between the two vertical plates can be determined according to the maximum wheel core size, and then two axial baffles 19 are arranged on the transverse limit rod. The axial baffles can be threadedly connected to the transverse limit rod, and can also be fixed by radially arranged screws. According to the different sizes of the wheel core, the spacing between the two axial baffles can be adjusted to meet the requirements.

[0037] The above embodiments are only preferred embodiments for fully illustrating the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or changes made by technicians in this technical field on the basis of the present utility model are all within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the claims.

Claims

1. A polyurethane roller 90° peeling test fixture, characterized in that: It includes a wheel core, a first connector and a second connector. The first connector is provided with a concave accommodating cavity, and a transverse limiting rod is provided in the concave accommodating cavity. The wheel core is sleeved on the transverse limiting rod. The second connector includes an adapter and two clamps. A locking rod bolt assembly and a lifting rod are provided on the two clamps. One end of the adapter is sleeved on the lifting rod, and the other end is provided with a second connecting portion connected to a tensile testing machine. The first connector is also provided with a first connecting portion connected to a tensile testing machine. The surface of the wheel core is bonded to one end of a polyurethane test strip, and the other end of the polyurethane test strip is arranged between the two clamps and clamped and fixed by the locking rod bolt assembly.

2. The polyurethane roller 90° peeling test fixture as claimed in claim 1, characterized in that: A through hole is arranged on the polyurethane test strip between the two clamping plates, and the locking rod bolt assembly passes through the through hole.

3. The polyurethane roller 90° peeling test fixture according to claim 1, characterized in that: The end of the screw rod of the locking rod bolt assembly is arranged as a self-tapping portion, and at least one clamping plate surface corresponding to the locking rod bolt assembly is arranged with an internal thread column, and the screw rod of the locking rod bolt assembly is threadedly connected with the internal thread column.

4. The polyurethane roller 90° peeling test fixture as claimed in claim 1, characterized in that: The first connector includes a first base plate, and two vertical plates are arranged in parallel on one surface of the first base plate. The two vertical plates cooperate with the base plate to form a concave accommodating cavity. The transverse limiting rod passes through the two vertical plates and is threadedly connected to the limiting nut. The first connecting part is arranged on the other surface of the first base plate.

5. The polyurethane roller 90° peeling test fixture as claimed in claim 1, characterized in that: A rough portion is arranged on the surface of the clamping plate on one side of the polyurethane test strip.

6. The polyurethane roller 90° peeling test fixture as claimed in claim 1, characterized in that: The locking rod bolt assembly is composed of a screw rod, a first nut and a spring washer, and the hanging rod is composed of a screw and a second nut.

7. The polyurethane roller 90° peeling test fixture as claimed in claim 1, characterized in that: The adapter comprises a second bottom plate, a hanging plate is arranged on one surface of the second bottom plate, a hanging hole is arranged on the hanging plate, and the second connecting portion is arranged on the other surface of the second bottom plate.

8. The polyurethane roller 90° peeling test fixture as claimed in claim 1, characterized in that: The number of the locking rod bolt assemblies is at least 2.

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