Torsion testing device

Abstract

The utility model discloses a torsion testing device, which is used for testing a screw rod and a nut which are matched with each other, the screw rod is screwed in the nut, the torsion testing device comprises a mechanical arm, a first clamping jaw, a second clamping jaw, a torsion sensor and a base, and the first clamping jaw is rotatably arranged at the end part of the mechanical arm and is used for clamping and screwing the screw rod; the second clamping jaw is fixedly connected with the torsion sensor and is used for clamping a nut; the torsion sensor is fixed on the base and is used for testing the torsion of the second clamping jaw; the base is used for mounting a torsion sensor; when the first clamping jaw drives the screw to rotate in the nut, the nut sequentially transmits torsion to the second clamping jaw and the torsion sensor. According to the torsion testing device, clamping feeding to a detection position, clamping rotation, detection and discharging processes are automatic, the magnitude of torsion needed when a product rotates is accurately detected, meanwhile, the efficient testing requirement is met, and full inspection of the produced product is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of instrument detection, in particular to a torque testing device. Background Art

[0002] With the change of production technology, more and more automated equipment is being put into production line operations to replace manual simple and repetitive assembly line operations, thereby reducing labor costs and improving productivity and corporate competitiveness. Currently, products need to undergo torque testing before they are put on the market to detect whether the production quality of the products meets the standards. The torque testing methods on the market are generally suitable for laboratories. They adopt a random inspection method, which requires manual rotation of products to test torque and inspect a small number of products. The inspection efficiency is low and it is not suitable for full product inspection during online fully automatic production. Utility Model Content

[0003] The main technical problem solved by the utility model is to provide a torque testing device to perform automated torque testing on products on a production line and achieve full inspection to avoid all or some of the above-mentioned defects.

[0004] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a torque test device for testing a screw and a nut that are adapted to each other, wherein the screw is screwed into the nut, and the torque test device comprises a mechanical arm, a first clamping jaw, a second clamping jaw, a torque sensor and a base, wherein the first clamping jaw is rotatably arranged at the end of the mechanical arm, and is used to clamp and rotate the screw;

[0005] The second clamping jaw is fixedly connected to the torque sensor and is used to clamp the nut;

[0006] The torque sensor is fixed on the base and is used to test the torque of the second clamping jaw;

[0007] The base is used to install the torque sensor;

[0008] When the first clamping jaw drives the screw rod to rotate in the nut, the nut sequentially transmits torque to the second clamping jaw and the torque sensor.

[0009] Among them, the first clamp includes a main body, a guide column and an upper clamp, the main body is rotatably connected to the end of the robotic arm, one end of the guide column is fixedly connected to the main body, the upper clamp is sleeved outside the guide column and can slide along the axial direction of the guide column, and the upper clamp is used to clamp the screw.

[0010] Wherein, the first clamping jaw further comprises a lower clamping jaw, the lower clamping jaw is connected to the other end of the guide column, the lower clamping jaw comprises two symmetrically arranged lower clamping blocks, the inner sides of the two lower clamping blocks have arc-shaped inner walls, and the shape of the inner walls is the same as the shape of the outer wall of the nut;

[0011] When the screw and the nut are moved, the inner wall of the lower clamping block abuts against the outer wall of the nut, and the lower clamping jaw clamps the nut. Before the upper clamping jaw drives the screw to rotate, the inner wall of the lower clamping block disengages from the outer wall of the nut.

[0012] Wherein, the upper clamping jaw comprises two symmetrically arranged upper clamping blocks, and the inner side shape of the two upper clamping blocks is the same as the outer wall shape of the screw rod.

[0013] Wherein, the first clamping jaw is a rotating clamping electric clamping jaw.

[0014] Wherein, the second clamp comprises a cylinder and a plurality of claw members, the plurality of claw members are symmetrically distributed, and the cylinder is used to drive the plurality of claw members to move.

[0015] Wherein, the number of the claw members is three, four or five.

[0016] Wherein, the torque testing device also includes a control system, and the control system is electrically connected to the mechanical arm, the first clamp, the second clamp and the torque sensor.

[0017] Wherein, the base is fixed on a horizontal platform or a horizontal bracket.

[0018] Compared with the prior art, the torque testing device of the utility model has the following beneficial effects: clamping and loading the material to the detection position, clamping and rotating and detecting and automating the unloading process, and accurately detecting the torque required for product rotation, while meeting the needs of efficient testing and achieving full inspection of produced products. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the assembly of the screw and the nut;

[0021] Figure 2 It is a schematic diagram of the screw being screwed out of the nut;

[0022] Figure 3It is a three-dimensional structural schematic diagram of the torque testing device of the utility model;

[0023] Figure 4 yes Figure 3 A partial enlarged view of the middle A part;

[0024] Figure 5 It is a schematic diagram of the structure before the screw is rotated;

[0025] Figure 6 yes Figure 5 A partial enlarged view of the middle B part;

[0026] Figure 7 It is a schematic diagram of the structure after the screw is screwed out of the nut;

[0027] Figure 8 yes Figure 7 A partial enlarged view of the middle C part;

[0028] Fig. 9 yes Figure 7 Schematic diagram of the structure from another perspective. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the utility model embodiment, all directional indications (such as up, down, left, right, front, back ...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. The terms "first", "second", etc. in this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the steps or units listed, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0031] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] See also Figures 1 to 9 , Figure 3 The utility model is a three-dimensional structural diagram of a torque test device, which provides a torque test device for testing Figure 1 and Figure 2 The screw 100 and nut 200 are adapted to each other, the screw 100 is screwed into the nut 200, and the torque testing device detects the torque required for the product component screw 100 to be screwed out of the nut 200. Conventional testing instruments are only suitable for manual sampling, which requires manual rotation of the product to test the torque, and are not suitable for full online production inspection.

[0033] In view of the above situation, the torque test device of the utility model includes a mechanical arm 1, a first clamping jaw 2, a second clamping jaw 3, a torque sensor 4 and a base 5. The mechanical arm 1 is used to install and move the test equipment. The first clamping jaw 2 is arranged at the end of the mechanical arm 1 and is rotatably connected with the mechanical arm 1, and is used to clamp and rotate the screw 100. The second clamping jaw 3 is fixedly connected to the torque sensor 4, and is used to clamp and fix the nut 200. The torque sensor 4 is fixed on the base 5, and is used to test the torque of the second clamping jaw 3. The base 5 is used to install and fix the torque sensor 4.

[0034] The first clamping jaw 2 and the second clamping jaw 3 clamp the screw rod 100 and the nut 200 respectively. When the screw rod 100 rotates from the nut 200, it will move up and down with the nut 200, so the nut 200 needs to be fixed. If it is fixed from the outside, the torque required to rotate the screw rod 100 will be transmitted to the external fixed parts, resulting in inaccurate torque detected by the torque sensor 4. Therefore, the present application fixes the cylinder of the second clamping jaw 3 on the torque sensor 4, and uses the principle that the action of force is mutual. The torque of the screw rod 100 is finally transmitted to the torque sensor 4. In the absence of external parts being disturbed by force, the torque obtained by the test is accurate. When the first clamping jaw 2 drives the screw rod 100 to rotate in the nut 200, the nut 200 transmits the torque to the second clamping jaw 3 and the torque sensor 4 in turn, that is, the torque required for the screw rod 100 to be rotated out of the nut 200 can be measured. When the first clamping jaw 2 drives the screw rod 100 to rotate, the first clamping jaw 2 rises together with the screw rod 100 and moves upward in coordination with the screw rod 100.

[0035] The torque testing device of the present application adopts a testing method that uses the first clamp 2 to follow the screw 100 to effectively detect torque, because the gravity of the first clamp 2 is certain, and this part of the influence can be eliminated by converting the weight and the lifting speed. Since the first clamp 2 follows the screw 100, the upward speed of the two is also consistent, and there will be no influence of other external forces. Through test comparison, the torque measured by this test method has a deviation of less than 3% from the actual torque, which meets the production requirements.

[0036] Preferably, the first clamping jaw 2 in the present application is a rotary clamping electric clamping jaw, which electrically controls clamping and rotation.

[0037] In the present application, the first clamp 2 includes a main body 21, a guide column 22 and an upper clamp 23. The main body 21 is rotatably connected to the end of the mechanical arm 1, one end of the guide column 22 is fixedly connected to the main body 21, and the upper clamp 23 is sleeved outside the guide column 22 and can slide along the axial direction of the guide column 22. The upper clamp 23 is used to clamp the screw 100. At present, there is a method of directly rotating the screw 100 using a motor, and coordinating the mechanism to move up and down. Since the speed of the screw 100 itself rotating and the speed of the mechanism rising are difficult to match, because the resistance of each product is different, the speed of the screw 100 rising is not certain, so it is also difficult to accurately test the torque in this way. After testing, the torque deviation measured by this method is 150%, which cannot be used. In the present application, the upper clamp 23 is sleeved outside the guide column 22, and when the clamping screw 100 rotates, it slides upward along the axial direction of the guide column 22. Since the screw 100 rotates and disengages from the nut 200, it will move upward at the same time. If the robot is used to rise, it cannot be guaranteed to be completely synchronized, which will cause the torque to be unstable and accurate. In the present application, the upper clamping jaw 23 is sleeved outside the guide column 22, and the upper clamping jaw 23 can slide up with the rise of the screw 100. Since the gravity of the first clamping jaw 2 is fixed and known, a constant external resistance can be indirectly obtained, and the actual rotational torque can be calculated through certain calculations.

[0038] In the present application, the upper clamping jaw 23 includes two symmetrically arranged upper clamping blocks, the inner side shape of the two upper clamping blocks is the same as the outer wall shape of the screw rod 100, so that the screw rod 100 can be better fixed when clamping, moving and rotating the screw rod 100. Usually, the inner side shape of the upper clamping block and the outer wall of the screw rod 100 are both arc-shaped.

[0039] In the present application, the first clamping jaw 2 also includes a lower clamping jaw 24, which is connected to the other end of the guide column 22. The lower clamping jaw 24 includes two symmetrically arranged lower clamping blocks, and the inner sides of the two lower clamping blocks have arc-shaped inner walls, and the shape of the inner walls is the same as the outer wall shape of the nut 200, so that the nut 200 can be better fixed when clamping and moving the nut 200. Usually, the inner wall shape of the lower clamping block and the outer wall of the nut 200 are both arc-shaped.

[0040] During the loading period before the torque test, when the screw 100 and the nut 200 are moved, the inner wall of the lower clamping block abuts against the outer wall of the nut 200, and the lower jaw 24 clamps the nut 200 and moves. At this time, there is no contact between the upper jaw 23 and the screw 100, and the lower jaw 24 drives the screw 100 and the nut 200 to be loaded at the same time. After the loading is completed, the lower jaw 24 opens to both sides, the inner wall of the lower clamping block is separated from the outer wall of the nut 200, and the bottom of the nut 200 is clamped and fixed by the second jaw 3. Then the first jaw 2 moves downward, so that the upper jaw 23 is aligned with the screw 100, and the screw 100 is clamped and fixed, and then rotated to drive the screw 100 to rotate. During the rotation process, the nut 200 is only fixed by the second jaw 3, which can eliminate external force interference, so that the data measured by the torque sensor 4 is the real torque.

[0041] In the present application, the second clamp 3 includes a cylinder 31 and a plurality of claw members 32, the plurality of claw members 32 are symmetrically distributed, the cylinder 31 is used to drive the plurality of claw members 32 to move, and the torque sensor 4 is fixed to the cylinder 31, so as to more accurately measure the torque between the screw 100 and the nut 200.

[0042] In one embodiment, the number of the claw members 32 is three. In another embodiment, the number of the claw members 32 is four. In yet another embodiment, the number of the claw members 32 is five. The plurality of claw members 32 are symmetrically arranged about the central axis.

[0043] The torque testing device in the present application also includes a control system, which is electrically connected to the robot arm 1, the first clamp 2, the second clamp 3 and the torque sensor 4, so as to control the clamping, feeding, rotating torque measurement and unloading processes of the screw 100 and the nut 200.

[0044] In the present application, the base 5 is fixed on a horizontal platform or a horizontal bracket, so that the entire test mechanism is kept in a balanced state, avoiding inaccurate torque measured by the torque sensor 4 due to the gravity of the components and the force between the components caused by tilt.

[0045] By using the torque testing device of the utility model, the processes of clamping and loading materials to the detection position, clamping and rotating and detecting and unloading materials are automated, so that the torque required for rotating the product can be accurately detected, and efficient testing requirements can be met at the same time, so as to realize full inspection of the produced products.

[0046] The above description is only an implementation method of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present utility model.

Claims

1. A torque test device for testing a screw and a nut that fit together, wherein the screw is screwed into the nut, characterized in that: The torque testing device comprises a mechanical arm, a first clamping jaw, a second clamping jaw, a torque sensor and a base, wherein the first clamping jaw is rotatably disposed at the end of the mechanical arm and is used to clamp and rotate the screw; The second clamping jaw is fixedly connected to the torque sensor and is used to clamp the nut; The torque sensor is fixed on the base and is used to test the torque of the second clamping jaw; The base is used to install the torque sensor; When the first clamping jaw drives the screw rod to rotate in the nut, the nut sequentially transmits torque to the second clamping jaw and the torque sensor.

2. The torque testing device according to claim 1, characterized in that: The first clamp includes a main body, a guide column and an upper clamp, the main body is rotatably connected to the end of the robotic arm, one end of the guide column is fixedly connected to the main body, the upper clamp is sleeved outside the guide column and can slide along the axial direction of the guide column, and the upper clamp is used to clamp the screw.

3. The torque testing device according to claim 2, characterized in that: The first clamping jaw further comprises a lower clamping jaw, the lower clamping jaw is connected to the other end of the guide column, the lower clamping jaw comprises two symmetrically arranged lower clamping blocks, the inner sides of the two lower clamping blocks have arc-shaped inner walls, and the shape of the inner walls is the same as the shape of the outer wall of the nut; When the screw and the nut are moved, the inner wall of the lower clamping block abuts against the outer wall of the nut, and the lower clamping jaw clamps the nut. Before the upper clamping jaw drives the screw to rotate, the inner wall of the lower clamping block disengages from the outer wall of the nut.

4. The torque testing device according to claim 2, characterized in that: The upper clamping jaw comprises two symmetrically arranged upper clamping blocks, and the inner side shape of the two upper clamping blocks is the same as the outer wall shape of the screw rod.

5. The torque testing device according to claim 1, characterized in that: The first clamping jaw is a rotating clamping electric jaw.

6. The torque testing device according to claim 1, characterized in that: The second clamp includes a cylinder and a plurality of claw members, the plurality of claw members are symmetrically distributed, and the cylinder is used to drive the plurality of claw members to move.

7. The torque testing device according to claim 6, characterized in that: The number of the claw members is three, four or five.

8. The torque testing device according to claim 1, characterized in that: The torque testing device also includes a control system, which is electrically connected to the mechanical arm, the first clamp, the second clamp, and the torque sensor.

9. The torque testing device according to claim 1, characterized in that: The base is fixed on a horizontal platform or a horizontal support.

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