Tension detection device

Abstract

The invention discloses a tension detection device, and relates to the technical field of tension detection. A tension detection device comprises a position adjusting mechanism, a frame body connected to the position adjusting mechanism, a stretching mechanism installed on the frame body, a first clamping mechanism connected to the stretching mechanism and a second clamping mechanism arranged relative to the first clamping mechanism. The stretching mechanism comprises a sliding piece connected to the frame body in a sliding mode, an abutting wheel connected to the sliding piece in a rotating mode, a cam piece connected to the frame body in a rotating mode and abutting against the abutting wheel and a rotation driving assembly connected to a cam, the cam rotates to drive the abutting wheel to move in a reciprocating mode, and the first clamping mechanism is connected to the sliding piece. According to the invention, a static tension test, a dynamic tension test and a high-frequency dynamic cyclic tension test can be conveniently carried out on a product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tension detection, in particular to a tension detection device. BACKGROUND

[0002] In the fields of mechanical manufacturing, electronic components, automobile parts, etc., tension testing is a key means to evaluate the mechanical properties and reliability of products, and the product quality needs to be inspected through static tension testing and dynamic tension testing. The static tension testing refers to testing by pulling the product to a certain form and maintaining it, and the dynamic tension testing refers to testing by applying gradually increasing tension to one end of the product to gradually move the pulling end away from the pulled end.

[0003] The current mainstream tension testing mechanism adopts a hydraulic cylinder driving mode. After fixing one end of the product, i.e., the pulled end, the other end of the product, i.e., the pulling section, is clamped by a clamping mechanism, and then the clamping mechanism is moved based on the driving hydraulic cylinder to make the pulling end move away from the pulled end to perform tension detection.

[0004] For products such as cables, connectors, and films, in addition to static tension testing and dynamic tension testing, high-frequency dynamic cyclic tension testing is also needed to simulate the repeated stress working conditions in actual use to verify the fatigue life and structural stability. When using a hydraulic cylinder as a driving end to perform tension detection, the hydraulic cylinder driving relies on the compression and flow of hydraulic oil to achieve power transmission, and the oil has viscosity, so the hydraulic cylinder cannot output high-frequency and high-speed cyclic pulling actions, and the system response has hysteresis, which cannot meet the needs of high-frequency dynamic cyclic tension testing. SUMMARY

[0005] In order to facilitate static tension testing, dynamic tension testing, and high-frequency dynamic cyclic tension testing of products, the present application provides a tension detection device.

[0006] The tension detection device provided by the present application adopts the following technical scheme: A tension detection device includes a positioning mechanism, a frame connected to the positioning mechanism, a stretching mechanism mounted on the frame, a first clamping mechanism connected to the stretching mechanism, and a second clamping mechanism arranged opposite to the first clamping mechanism. The stretching mechanism includes a sliding member slidingly connected to the frame, a pressing wheel rotatably connected to the sliding member, a cam member rotatably connected to the frame and abutting against the pressing wheel, and a driving assembly connected to the cam. The rotation of the cam can drive the pressing wheel to reciprocate, and the first clamping mechanism is connected to the sliding member.

[0007] By adopting the technical scheme, one end of the product is clamped by the first clamping mechanism, the other end of the product is clamped by the second clamping mechanism, then the driving driving assembly drives the cam member to rotate, so as to drive the abutting wheel and the sliding member to reciprocate to test the tensile force of the product, the cam member is driven to rotate to a certain angle to maintain the product to be pulled to a certain length to maintain the static tensile force test, the cam member is driven to rotate slowly to gradually elongate the product to a certain length to perform the dynamic tensile force test, and the cam member is driven to rotate at high speed to make the product be stretched in high frequency and cycle to perform the high-frequency dynamic cycle tensile force test.

[0008] Preferably, the cam member comprises: a cam body having a rotation axis; an outer peripheral working surface, which is arranged around the rotation axis and is configured to interact with the abutting wheel when the cam member rotates; The outer peripheral working surface comprises a start section, a working section and an end section connected in sequence, the outer diameter of the working section increases from the start section to the end section, and a stage is formed at the connection between the end section and the start section.

[0009] By adopting the technical scheme, the abutting wheel abutting against the cam member is periodically reciprocated when passing through the start section, the working section and the end section, which can cooperate to complete the high-frequency dynamic cycle tensile force test of the product.

[0010] Preferably, the outer diameter of the working section gradually increases or increases in steps.

[0011] By adopting the technical scheme, the gradually increasing outer diameter of the working section can make the abutting wheel move at a constant speed to cooperate to complete the dynamic tensile force test of the product, and if the outer diameter of the working section increases in steps, the abutting wheel will move in steps when the cam member rotates, that is, the force of the product being pulled is increased in steps, which can simulate more types of tensile force tests.

[0012] Preferably, the cam body comprises a shaft portion rotatably connected to the frame and a cam portion connected to the shaft portion, and the cam portion is detachably connected to the shaft portion.

[0013] By adopting the technical scheme, the cam portion can be detached to replace other types of cam portions to broaden the types of tensile force tests.

[0014] Preferably, the stretching mechanism further comprises an abutting spring, and two ends of the abutting spring are connected to the frame and the sliding member, respectively.

[0015] By adopting the technical scheme, the abutting spring can provide the abutting wheel with the force abutting against the cam member.

[0016] Preferably, the driving wheel assembly comprises a worm gear connected to the cam and a driving wheel connected to the worm gear.

[0017] By adopting the technical scheme, the worm gear can be self-locked to prevent the cam from malfunctioning during static tension test.

[0018] Preferably, the frame body is provided with a displacement detection member for detecting the displacement of the sliding member.

[0019] By adopting the technical scheme, the displacement detection member can detect the displacement of the sliding member to determine whether the displacement of the pressing wheel is constant.

[0020] Preferably, the position adjusting mechanism comprises a rack, a horizontal movement module connected to the rack, and a vertical movement module connected to the horizontal movement module, and the frame body is connected to the vertical movement module.

[0021] By adopting the technical scheme, the horizontal movement module and the vertical movement module are driven to adjust the position of the first clamping mechanism.

[0022] Preferably, the first clamping mechanism and the second clamping mechanism are both wedge clamps.

[0023] In summary, the present application has at least one of the following beneficial technical effects: 1. The first clamping mechanism clamps one end of the product, the second clamping mechanism clamps the other end of the product, the driving wheel assembly drives the cam to rotate to drive the pressing wheel and the sliding member to reciprocate for tension test, the cam is rotated to a certain angle to maintain the product being pulled to a certain length, the cam is slowly rotated to gradually elongate the product to a certain length for dynamic tension test, and the cam is high-speed rotated to make the product be stretched in high frequency for high-frequency dynamic cycle tension test. 2. The gradually increasing outer diameter of the working section can make the pressing wheel move at a constant speed to complete the dynamic tension test of the product, and if the outer diameter of the working section increases in steps, the pressing wheel will move in steps when the cam rotates, that is, the force of the product being pulled increases in gradient, which can simulate more types of tension test. 3. The displacement detection member can detect the displacement of the sliding member to determine whether the displacement of the pressing wheel is constant, and if the displacement of the pressing wheel deviates, it can be inferred that the cam is severely worn and needs to be replaced. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a schematic view of the overall structure of a tension detection device in the embodiment of the present application. Figure 2 is a structural schematic diagram for embodying a stretching mechanism; Figure 3 is a structural schematic diagram for embodying one type of cam member; Figure 4 is a structural schematic diagram for embodying another type of cam member; Figure 5 is a structural schematic diagram for embodying another type of cam member.

[0025] In the drawings: 1, a positioning mechanism; 11, a machine frame; 12, a horizontal movement module; 13, a vertical movement module; 2, a frame body; 3, a stretching mechanism; 31, a sliding member; 32, a pressing wheel; 33, a cam member; 331, a cam body; 3311, a shaft portion; 3312, a cam portion; 332, an outer peripheral working surface; 3321, a starting section; 3322, a working section; 3323, an end section; 34, a driving assembly; 341, a worm gear transmission member; 342, a driving member; 35, a pressing spring; 4, a first clamping mechanism; 5, a second clamping mechanism. DETAILED DESCRIPTION

[0026] The application will be further described below in conjunction with the drawings.

[0027] In the description of the application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0028] The application embodiment discloses a tension detection device. The tension detection device can facilitate static tension test, dynamic tension test, high-frequency dynamic cycle tension test and gradient tension test on products.

[0029] Reference Figure 1 A tension detection device includes a positioning mechanism 1, a frame body 2 connected to the positioning mechanism 1, a stretching mechanism 3 installed on the frame body 2, a first clamping mechanism 4 connected to the stretching mechanism 3, and a second clamping mechanism 5 arranged relative to the first clamping mechanism 4, the first clamping mechanism 4 is located above the second clamping mechanism 5, and the stretching mechanism 3 can drive the first clamping mechanism 4 to move up and down reciprocally. Of course, in order to complete the tension test, a sensor for detecting the tension value, such as a strain gauge type tension sensor, a piezoelectric type tension sensor and a capacitive type tension sensor, etc., is installed correspondingly. Different sensors have different installation methods, for example, the strain gauge type tension sensor can be generally installed between the first clamping mechanism 4 and the stretching mechanism 3, and the specific installation method is prior art.

[0030] The driving positioning mechanism 1 drives the first clamping mechanism 4 to move to the upper side of the second clamping mechanism 5, clamps one end of the product by the first clamping mechanism 4, clamps the other end of the product by the second clamping mechanism 5, and then drives the stretching mechanism 3 to move the first clamping mechanism 4 to perform the tensile test.

[0031] With reference to Figure 1 , the positioning mechanism 1 comprises a rack 11, a transverse moving module 12 connected to the rack 11, and a vertical moving module 13 connected to the transverse moving module 12, and the rack body 2 is connected to the vertical moving module 13. The transverse moving module 12 and the vertical moving module 13 are, for example, chain wheel and chain moving module, gear and rack moving module, or ball screw moving module, etc.

[0032] The first clamping mechanism 4 is driven to move by the transverse moving module 12 and the vertical moving module to perform positioning.

[0033] In actual tensile test, the first clamping mechanism 4 is driven to move by the transverse moving module 12 and the vertical moving module until it deviates from the second clamping mechanism 5 in the vertical direction, and at this time, the product is tested by the first clamping mechanism 4 and the second clamping mechanism 5 in a diagonal direction.

[0034] With reference to Figure 2 , the stretching mechanism 3 comprises a sliding piece 31 slidingly connected to the rack body 2, a pressing wheel 32 rotatably connected to the sliding piece 31, a cam piece 33 rotatably connected to the rack body 2 and abutting against the pressing wheel 32, and a driving assembly 34 connected to the cam. The pressing wheel 32 is located above the cam piece 33, the sliding piece 31 can slide up and down, the cam can drive the pressing wheel 32 to move vertically and reciprocally, and the first clamping mechanism 4 is connected to the sliding piece 31. In order to ensure that the pressing wheel 32 abuts against the cam piece 33, the stretching mechanism 3 further comprises a pressing spring 35 sleeved on the sliding piece 31, and the two ends of the pressing spring 35 are connected to the rack body 2 and the sliding piece 31 respectively.

[0035] When the second clamping mechanism 5 clamps the pulled end of the product and the first clamping mechanism 4 clamps the pulled end of the product, the cam piece 33 is driven to rotate by driving the driving assembly 34, thereby driving the pressing wheel 32 and the sliding piece 31 to reciprocate and in turn driving the pulled end of the product to move away from or close to the pulled end of the product to perform the tensile test on the product.

[0036] With reference to Figure 2 and Figure 3, in order to reliably complete the static tension test, dynamic tension test and high frequency dynamic cycle tension test, the cam member 33 comprises a cam body 331 having a rotation axis, an outer wall of the cam body 331 is formed with an outer peripheral working surface 332, the outer peripheral working surface 332 is arranged around the rotation axis and is configured to interact with the pressing wheel 32 when the cam member 33 rotates; the outer peripheral working surface 332 comprises a start section 3321, a working section 3322 and an end section 3323 connected in sequence in a clockwise direction, the outer diameter of the working section 3322 increases from the start section 3321 to the end section 3323, and a step is formed at the connection between the end section 3323 and the start section 3321. In this embodiment, the outer diameter of the working section 3322 gradually increases.

[0037] In this application, the cam member 33 is driven to rotate to a certain angle to maintain the product being pulled to a certain length to maintain the static tension test; the cam member 33 is driven to rotate slowly to gradually elongate the product to a certain length to perform the dynamic tension test; the cam member 33 is driven to rotate at high speed to make the product be stretched in high frequency and fast cycle to perform the high frequency dynamic cycle tension test.

[0038] In other embodiments, referring to Figure 3 and Figure 4 , the outer diameter of the working section 3322 can also be stepped up, at this time the cam member 33 is driven to rotate slowly to elongate the product to a certain length in steps to perform the gradient tension test.

[0039] Of course, in more embodiments, referring to Figure 3 and Figure 5 , in order to match the actual test requirements, the outer shape of the cam member 33 can be freely processed and adjusted, for example, a disc-shaped cam with a larger outer diameter and a smaller outer diameter.

[0040] Referring to Figure 2 , in order to facilitate the replacement of the style of the cam member 33 to broaden the scene of the tension test, the cam body 331 comprises a shaft part 3311 rotatably connected to the frame 2 and a cam part 3312 connected to the shaft part 3311, the cam part 3312 is detachably connected to the shaft part 3311 by a screw.

[0041] Referring to Figure 2 , the drive assembly 34 comprises a worm gear transmission member 341 connected to the cam and a drive member 342 connected to the worm gear transmission member 341, the worm gear transmission member 341 is self-locking, and the drive member 342 is preferably an electric motor. The drive member 342 drives the cam member 33 to rotate through the worm gear transmission member 341 to perform the tension test, and the self-locking property of the worm gear transmission member 341 can better statically retain the cam member 33 to facilitate the product to perform the static tension test.

[0042] With reference to Figure 2 , the cam member 33 is prone to wear even if made of wear-resistant material, in order to be able to obtain the wear condition of the cam member 33 in time, the frame body 2 is provided with a displacement detection member for detecting the displacement amount of the sliding member 31, such as a laser sensor, a photoelectric sensor, an ultrasonic sensor, a potential sensor and a Hall sensor, and the specific installation form and sensor structure are prior art and thus will not be described here. Based on the detection of the displacement amount of the sliding member 31 by the displacement detection member, it can be judged whether the displacement amount of the abutting wheel 32 is constant, if the displacement amount of the abutting wheel 32 deviates, it can be inferred that the cam member 33 is seriously worn and needs to be replaced.

[0043] With reference to Figure 1 and Figure 2 , the first clamping mechanism 4 and the second clamping mechanism 5 are wedge clamps special for tensile test, and the specific structure of the wedge clamps is prior art and thus will not be described here.

[0044] Compared with the hydraulic cylinder as the driving end, the application based on the form of the abutting of the cam member 33 and the abutting wheel 32 drives the sliding member 31 to move up and down to make the first clamping mechanism 4 move up and down to perform tensile test has more advantages: first, since the size and shape of the cam member 33 can be pre-processed, the cooperation of the cam member 33 and the abutting wheel 32 has high precision and repeatability when performing tensile test, and the results of multiple tests are good in comparability; second, compared with the hydraulic system, the hydraulic system is usually composed of many elements such as hydraulic pump, oil tank, servo valve, accumulator, filter and cooler, the structure of the application is relatively simple, the mechanical efficiency is high, the maintenance cost is low, and it has no problems of oil leakage and oil temperature rise, and it can be used in any environment to perform tensile test; 3, the frequency of high-frequency cycle test depends on the output speed of the motor, and the frequency can be high; 4, in the application, the movement form of the product pulling end depends on the design of the outer peripheral working surface 332, and the shape of the cam member 33 can be flexibly adjusted to adapt to different test scenes.

[0045] The implementation principle of one tensile test device in the embodiment of the application is as follows: The driving transverse moving module 12 and the vertical moving module 13 drive the first clamping mechanism 4 to move to the second clamping mechanism 5 directly above, the first clamping mechanism 4 clamps one end of the product, the second clamping mechanism 5 clamps the other end of the product, then the driving driving assembly 34 drives the cam 33 to rotate to drive the abutting wheel 32 and the sliding piece 31 to reciprocate to test the tensile strength of the product; specifically, the cam 33 is driven to rotate to a certain angle to maintain the product to be pulled to a certain length to maintain the static tensile test, the cam 33 is driven to rotate slowly to make the product gradually elongated to a certain length to maintain the dynamic tensile test, the cam 33 is driven to rotate at high speed to make the product be stretched in high frequency and fast cycle to maintain the high frequency dynamic cycle tensile test.

[0046] The embodiments of the specific implementation are the preferred embodiments of the application, not limited to the protection scope of the application, so: any equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A tensile force detection device, characterized in that: It includes an adjustment mechanism (1), a frame (2) connected to the adjustment mechanism (1), a tensioning mechanism (3) installed on the frame (2), a first clamping mechanism (4) connected to the tensioning mechanism (3), and a second clamping mechanism (5) provided relative to the first clamping mechanism (4); the tensioning mechanism (3) includes a sliding member (31) slidably connected to the frame (2), a pressure wheel (32) rotatably connected to the sliding member (31), a cam member (33) rotatably connected to the frame (2) and abutting against the pressure wheel (32), and a drive assembly (34) connected to the cam. The rotation of the cam can drive the pressure wheel (32) to move back and forth. The first clamping mechanism (4) is connected to the sliding member (31).

2. The tensile force detection device according to claim 1, characterized in that: The cam component (33) includes: The cam body (331) has a rotation axis; The outer peripheral working surface (332) is arranged around the rotation axis and is configured to interact with the pressure wheel (32) when the cam (33) rotates; The outer peripheral working surface (332) includes a starting segment (3321), a working segment (3322) and an ending segment (3323) connected end to end in sequence. The outer diameter of the working segment (3322) increases from the starting segment (3321) to the ending segment (3323). A platform is formed at the connection between the ending segment (3323) and the starting segment (3321).

3. The tensile force detection device according to claim 2, characterized in that: The outer diameter of the working section (3322) gradually increases or increases in a stepwise manner.

4. The tensile force detection device according to claim 2, characterized in that: The cam body (331) includes a shaft (3311) rotatably connected to the frame (2) and a cam (3312) connected to the shaft (3311), wherein the cam (3312) is detachably connected to the shaft (3311).

5. A tensile force testing device according to any one of claims 1-4, characterized in that: The tensioning mechanism (3) also includes a compression spring (35), the two ends of which are connected to the frame (2) and the sliding member (31) respectively.

6. A tensile force testing device according to any one of claims 1-4, characterized in that: The drive assembly (34) includes a worm gear transmission component (341) connected to the cam and a drive component (342) connected to the worm gear transmission component (341).

7. A tensile force testing device according to any one of claims 1-4, characterized in that: The frame (2) is equipped with a displacement detection device for detecting the displacement of the sliding component (31).

8. A tensile force testing device according to any one of claims 1-4, characterized in that: The adjustment mechanism (1) includes a frame (11), a horizontal moving module (12) connected to the frame (11), and a vertical moving module (13) connected to the horizontal moving module (12). The frame (2) is connected to the vertical moving module (13).

9. A tensile force testing device according to any one of claims 1-4, characterized in that: Both the first clamping mechanism (4) and the second clamping mechanism (5) are wedge-shaped clamps.

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