A core rod push-out force test tool for a core pull rivet

Abstract

The utility model discloses a kind of core rod push-out force test tool of core rivet, including workbench, four transmission supports are fixedly connected to the workbench, the transmission support of left side is fixedly connected with slide bar, transmission screw is connected between the transmission support of right side with pivot;Cooperative connection moving plate is on the transmission screw, the moving plate is slidably connected in slide bar, the moving plate is fixedly connected with pressure bar, realizes the automation uniform speed pressure of core rivet core rod push-out test by motor drive screw drive mechanism, avoid the force value deviation and speed uneven problem brought by manual operation, significantly improve the accuracy and repeatability of test result.

Description

Technical Field

[0001] This utility model relates to the field of aerospace standard parts technology, and in particular to a tooling for testing the push-out force of a core-pulling rivet. Background Technology

[0002] In aerospace, rail transportation, and high-end equipment manufacturing, blind rivets are critical fasteners whose reliability directly determines the safety and service life of the entire structure. The mandrel push-out force is a core indicator for measuring the assembly quality and mechanical performance of blind rivets. Insufficient mandrel push-out force can easily lead to rivet loosening, connection failure, and equipment malfunctions; excessive force can increase assembly difficulty and even cause deformation damage to the rivet itself or the connected components. With the increasing demands for product precision and reliability in these fields, the industry has set higher standards for the testing accuracy, efficiency, and data integrity of blind rivet mandrel push-out force.

[0003] A search revealed Chinese Patent Publication No. CN223179675U, which discloses a tooling for testing the push-out force of a blind rivet core rod, relating to the field of aerospace standard parts technology. The tooling includes a mounting base, a guide sleeve, a push rod, and the rivet to be tested. The push-out force of the core rod can be measured by applying a vertically downward axial force to the push rod using a mechanical device. During the test, the rivet to be tested is first riveted and assembled in the mounting base using a special rivet gun to form a rivet body. Then, the guide sleeve is embedded into the mounting base; the push rod is inserted into the guide sleeve, with its end slightly smaller than the diameter of the core rod, making axial contact with the core rod of the rivet to be tested. This assembly connection structure ensures the accuracy of the riveting installation process and forms a good guiding system. Finally, a vertically downward axial force is applied using a mechanical device, and the force measuring system accurately collects the push-out force of the core rod. However, it still has problems such as the lack of integrated automated power mechanism and real-time displacement monitoring, resulting in a low level of automation and intelligence. Utility Model Content

[0004] The purpose of this utility model is to provide a tooling for testing the push-out force of a core-pulling rivet, in order to solve the problems of the lack of integrated automated power mechanism and real-time displacement monitoring in the existing technology, and the low degree of automation and intelligence.

[0005] To achieve the above objectives, a tooling for testing the push-out force of a pull rivet is provided, including a worktable. The worktable is fixedly connected to four transmission brackets. A slide rod is fixedly connected to the left transmission bracket, and a transmission screw is connected to the right transmission bracket via a rotating shaft.

[0006] A movable plate is connected to the transmission screw, the movable plate is slidably connected to the slide rod, and a pressure rod is fixedly connected to the movable plate.

[0007] According to the aforementioned tooling for testing the push-out force of a core-pulling rivet rod, a detachable rod head is fixedly connected to the end of the pressure rod, and a displacement sensor is fixedly connected to the pressure rod.

[0008] According to the aforementioned tooling for testing the push-out force of a pull-out rivet core rod, a motor bracket is fixedly connected to the transmission bracket, a motor is fixedly connected to the motor bracket, and the rotating shaft of the motor is fixedly connected to the transmission screw via a coupling.

[0009] According to the aforementioned tooling for testing the push-out force of a pull-out rivet core rod, a lower clamp is fixedly connected to the rear side of the worktable, an upper clamp is provided at the upper end of the lower clamp, connecting plates are fixedly connected to both sides of the lower clamp and the upper clamp, and a sleeve is provided at the lower end of the upper clamp.

[0010] According to the aforementioned tooling for testing the push-out force of a pull-out rivet core rod, each of the connecting plates is fitted with a clamping screw, and a rotating handle is fixedly connected to the top of each clamping screw.

[0011] According to the aforementioned tooling for testing the ejection force of a core-pulling rivet, a force sensor is fixedly connected to the rear end of the upper clamp, and a protective cover is fixedly connected to the rear end of the upper clamp.

[0012] According to the aforementioned tooling for testing the push-out force of a core-pulling rivet, a camera base is fixedly connected to the top surface of the worktable, and an industrial camera is fixedly connected to the camera base.

[0013] According to the aforementioned tooling for testing the push-out force of a pull-out rivet core rod, a control panel is fixedly connected to the side wall of the workbench.

[0014] The above-mentioned solution has the following beneficial effects:

[0015] 1. This patent achieves automated and uniform pressure application for the core rod ejection test of the pull rivet by using a motor-driven screw transmission mechanism, avoiding the problems of force deviation and speed unevenness caused by manual operation, and significantly improving the accuracy and repeatability of the test results.

[0016] 2. This patent features a replaceable rod head design that allows for quick adaptation to various sizes of blind rivets, making it highly versatile and easy to operate. The added protective cover effectively prevents the rod from splashing during testing, ensuring operational safety.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0019] Figure 1 This is a schematic diagram of the overall design of a core-pulling rivet core rod push-out force testing fixture of this utility model;

[0020] Figure 2 This is a front view of a tooling for testing the push-out force of a pull-out rivet core rod according to this utility model;

[0021] Figure 3 This is a top view of a tooling for testing the push-out force of a pull-out rivet core rod according to this utility model;

[0022] Figure 4 This is a side view of a tooling for testing the push-out force of a pull-out rivet core rod according to this utility model.

[0023] Legend:

[0024] 1. Upper clamp; 2. Sleeve; 3. Worktable; 4. Lower clamp; 5. Transmission bracket; 6. Motor; 7. Motor bracket; 8. Rotating handle; 9. Clamping screw; 10. Connecting plate; 11. Control panel; 12. Detachable rod head; 13. Slide rod; 14. Protective cover; 15. Displacement sensor; 16. Pressure rod; 17. Transmission screw; 18. Moving plate; 19. Force sensor; 20. Industrial camera; 21. Camera base. Detailed Implementation

[0025] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0026] Reference Figure 1-4 This utility model provides a tooling for testing the push-out force of a core-pulling rivet, including a workbench 3. The workbench 3 is fixedly connected to four transmission brackets 5. A slide rod 13 is fixedly connected to the left transmission bracket 5, and a transmission screw 17 is connected between the right transmission brackets 5 via a rotating shaft.

[0027] A movable plate 18 is connected to the transmission screw 17. The movable plate 18 is slidably connected to the slide rod 13. A pressure rod 16 is fixedly connected to the movable plate 18. During the test, the transmission screw 17 rotates under the drive of external power. Since the movable plate 18 and the transmission screw 17 are threadedly connected, and the movable plate 18 is also slidably connected to the slide rod 13, the slide rod 13 can restrict the movable plate 18 from rotating synchronously with the transmission screw 17, and it can only move linearly along the axis of the slide rod 13. When the movable plate 18 moves, it drives the pressure rod 16 fixed on it to move synchronously.

[0028] A detachable rod head 12 is fixedly connected to the end of the pressure rod 16. A displacement sensor 15 is fixedly connected to the pressure rod 16. The detachable rod head 12 can be replaced with a suitable specification according to the diameter and head shape of the core rod of the mandrel to be tested, so as to ensure full contact between the rod head and the end face of the core rod and avoid local pressure deformation or slippage of the core rod during pressure application. The displacement sensor 15 moves synchronously with the pressure rod 16 and can collect the moving distance of the pressure rod 16 in real time, thereby indirectly obtaining the stroke data of the core rod being pushed out.

[0029] A motor bracket 7 is fixedly connected to the transmission bracket 5, and a motor 6 is fixedly connected to the motor bracket 7. The rotating shaft of the motor 6 is fixedly connected to the transmission screw 17 through a coupling. The speed of the motor 6 can be adjusted by the control terminal, thereby controlling the rotation speed of the transmission screw 17, realizing precise control of the moving speed of the moving plate 18 and the pressure rod 16, and meeting the test requirements of the push-out force loading rate of different specifications of blind rivets.

[0030] A lower clamp 4 is fixedly connected to the rear side of the workbench 3. An upper clamp 1 is set on the upper end of the lower clamp 4. Connecting plates 10 are fixedly connected to both sides of the lower clamp 4 and the upper clamp 1. A sleeve 2 is set on the lower end of the upper clamp 1. Before testing, the body of the pop rivet is placed in the positioning groove of the lower clamp 4. The sleeve 2 at the lower end of the upper clamp 1 is aligned with the rivet core rod. The inner hole size of the sleeve 2 is adapted to the outer diameter of the rivet body to prevent the rivet body from shifting during the test.

[0031] Each of the connecting plates 10 is fitted with a clamping screw 9. Each clamping screw 9 has a rotating handle 8 fixedly connected to its top. When the clamping screw 9 rotates, it will generate axial displacement, which will push the upper clamp 1 to move downward along the axial direction of the clamping screw 9 until the upper clamp 1 and the lower clamp 4 clamp the rivet body. The axial displacement of the clamping screw 9 can be adjusted by rotating the rotating handle 8, thereby controlling the clamping force of the upper clamp 1 and the lower clamp 4.

[0032] A force sensor 19 is fixedly connected to the rear end of the upper clamp 1, and a protective cover 14 is fixedly connected to the rear end of the upper clamp 1. The force sensor 19 converts the received mechanical signal into an electrical signal and transmits it to the control terminal in real time. The operator can read the real-time force value during the core rod ejection process through the terminal. When the core rod is completely separated from the rivet body, the force value of the force sensor 19 will drop sharply. The peak force value at this time is the ejection force of the core rod. The protective cover 14 is installed on the outside of the force sensor 19 to prevent the core rod from falling off and debris from splashing and causing impact damage to the force sensor 19 during the test.

[0033] A camera base 21 is fixedly connected to the top surface of the workbench 3, and an industrial camera 20 is fixedly connected to the camera base 21. During the test, the industrial camera 20 captures the process of the core rod being pushed out in real time at a set frame rate, recording the complete visual information of the core rod from being subjected to force, deformation to detaching from the rivet body; the captured image data is transmitted to the control terminal, and linked with the stroke data of the displacement sensor 15 and the force value data of the force sensor 19 for analysis.

[0034] A control panel 11 is fixedly connected to the side wall of the workbench 3. The operation buttons on the control panel 11 are used to set test parameters, such as the speed of the motor 6, the upper limit of the test stroke, and the shooting frame rate of the industrial camera 20.

[0035] Working principle: When this testing fixture is working, the pop rivet is first placed in the sleeve 2, and the upper clamp 1 and lower clamp 4 are closed by rotating the handle 8 on the clamping screw 9, thereby firmly clamping the rivet body. Then, the motor 6 is started through the control panel 11. The motor 6 drives the transmission screw 17 to rotate, so that the moving plate 18 moves smoothly along the slide bar 13, thereby pushing the pressure rod 16 and the detachable rod head 12 fixed on it to press against the end of the rivet core rod at a uniform speed. During this process, the force sensor 19 monitors and collects the maximum thrust required to push the core rod out in real time, the displacement sensor 15 records the pushing displacement simultaneously, and the industrial camera 20 can monitor and identify the test process. Finally, all data are collected and processed to accurately measure the pushing force of the core rod.

[0036] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A tooling for testing the push-out force of a blind rivet core rod, comprising: The workbench (3) is characterized in that the workbench (3) is fixedly connected with four transmission brackets (5), the left transmission bracket (5) is fixedly connected with a slide rod (13), and the right transmission bracket (5) is connected with a transmission screw (17) by a rotating shaft. A movable plate (18) is connected to the transmission screw (17), the movable plate (18) is slidably connected to the slide rod (13), and a pressure rod (16) is fixedly connected to the movable plate (18).

2. The tooling for testing the push-out force of a pull-out rivet core rod according to claim 1, characterized in that, The end of the pressure rod (16) is fixedly connected to a detachable rod head (12), and a displacement sensor (15) is fixedly connected to the pressure rod (16).

3. The tooling for testing the push-out force of a pull-out rivet core rod according to claim 1, characterized in that, A motor bracket (7) is fixedly connected to the transmission bracket (5), and a motor (6) is fixedly connected to the motor bracket (7). The rotating shaft of the motor (6) is fixedly connected to the transmission screw (17) through a coupling.

4. The tooling for testing the push-out force of a pull-out rivet core rod according to claim 1, characterized in that, A lower clamp (4) is fixedly connected to the rear side of the workbench (3). An upper clamp (1) is provided at the upper end of the lower clamp (4). Connecting plates (10) are fixedly connected to both sides of the lower clamp (4) and the upper clamp (1). A sleeve (2) is provided at the lower end of the upper clamp (1).

5. The tooling for testing the push-out force of a pull-out rivet core rod according to claim 4, characterized in that, Each of the connecting plates (10) is connected to a clamping screw (9), and a rotating handle (8) is fixedly connected to the top of each clamping screw (9).

6. The tooling for testing the push-out force of a pull-out rivet core rod according to claim 4, characterized in that, A force sensor (19) is fixedly connected to the rear end of the upper clamp (1), and a protective cover (14) is fixedly connected to the rear end of the upper clamp (1).

7. The tooling for testing the push-out force of a pull-out rivet core rod according to claim 1, characterized in that, A camera base (21) is fixedly connected to the top surface of the workbench (3), and an industrial camera (20) is fixedly connected to the camera base (21).

8. The tooling for testing the push-out force of a pull-out rivet core rod according to claim 1, characterized in that, The control panel (11) is fixedly connected to the side wall of the workbench (3).

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