Servo tension and compression testing device

Abstract

The utility model relates to the technical field of tension and compression testing machines, and discloses a servo tension and compression testing device, which comprises a bracket; the execution unit is fixedly arranged on the bracket; the tension and compression sensor is installed on an output shaft of the execution unit and used for extruding / stretching a tested workpiece, and the tested workpiece is fixedly arranged on the lower portion of the support; the deformation detection structures are respectively arranged on the tension and compression sensor and the bracket, and are used for detecting the axial deformation of the tension and compression sensor and the bracket in the axial direction when the tension and compression testing device stretches / extrudes the workpiece; through the arrangement of the deformation detection structure, the micro deformation generated by the tension and compression sensor and the bracket is detected by utilizing the displacement generated by the sliding block along the grating ruler, so that the problems caused by the deformation in the tension and compression test are eliminated, and the accuracy of the test device is improved.

Description

Technical Field

[0001] This utility model relates to the field of tensile and compressive testing machine technology, specifically to a servo tensile and compressive testing device. Background Technology

[0002] The tensile and compressive testing machine (pneumatic type) is a mechanical testing device with a servo cylinder (actuator) as the core power source. It achieves precise application of tensile or compressive loads by pneumatically driving the piston to reciprocate. The system consists of a servo cylinder, pressure sensor, air circuit control valve and PLC / controller. In closed-loop control mode, the target force value can be set, and it supports constant speed loading or pressure holding test.

[0003] In actual tensile and compressive testing, the testing machine itself will generate a certain amount of deformation, which will lead to a decrease in the measurement accuracy of the workpiece. To address this, the applicant has designed a structure that can detect the deformation of the testing machine itself and install it on the parts that are prone to deformation, thereby improving the accuracy of the testing device. Utility Model Content

[0004] The purpose of this invention is to provide a servo tensile and compressive testing device to solve the above-mentioned technical problems.

[0005] This utility model provides the following technical solution:

[0006] A servo tensile / compression testing device, comprising:

[0007] support;

[0008] The execution unit is fixedly mounted on the bracket;

[0009] A tension / compression sensor is mounted on the output shaft of the actuator and is used to compress / stretch the workpiece being measured, which is fixedly mounted on the lower part of the support.

[0010] The deformation detection structure is respectively set on the tension / compression sensor and the bracket. When the tension / compression testing device stretches / compresses the workpiece, it is used to detect the axial deformation of the tension / compression sensor and the bracket along the axial direction.

[0011] As a preferred embodiment of the above technical solution, the bracket includes a base frame fixedly mounted on the table, a support frame fixedly connected to the upper surface of the base frame, and a mounting frame fixedly mounted at the upper part of the support frame, wherein the execution unit is fixed on the mounting frame.

[0012] As a preferred embodiment of the above technical solution, the deformation detection structure includes a grating ruler, which is fixedly installed on the side wall of the support frame. A slider is also slidably disposed on the grating ruler, and a connecting rod is provided between the slider and the tension / compression sensor, so that the tension / compression sensor moves synchronously with the slider.

[0013] As a preferred embodiment of the above technical solution, the tension / compression sensor also has an output interface disposed on its side, and a controller is fixed on the outer sidewall of the support frame. The output interface is electrically connected to the controller, and the controller is also electrically connected to the execution unit.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. In this utility model, by setting a deformation detection structure, the displacement of the slider along the grating ruler is used to detect the minute deformation generated by the tension and compression sensor and the bracket, so as to eliminate the problems caused by the deformation in the tension and compression test and improve the accuracy of the test device.

[0016] 2. In this utility model, an output interface and a controller are provided. The output interface is set on the tension and compression sensor and is used to input the pressure signal to the controller. The controller controls the tension or compression load of the execution unit to form a servo closed loop. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the overall structure of the deformation detection structure;

[0019] Figure 3 This is a three-dimensional structural diagram of the testing device used to perform tensile testing on a workpiece.

[0020] Figure 4 This is a three-dimensional structural diagram of the testing device used to perform a compression test on a workpiece.

[0021] Figure 5 A schematic diagram of a servo closed loop consisting of a stretch sensor, controller, and actuator.

[0022] In the diagram: 100, bracket; 101, base frame; 102, support frame; 103, mounting frame;

[0023] 200. Controller;

[0024] 300. Execution unit; 301. Output shaft; 302. Tension / compression sensor; 303. Output interface;

[0025] 400. Deformation detection structure; 401. Grating ruler; 402. Slider; 403. Connecting rod. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figure 1-4 As shown, this utility model provides a technical solution: a servo tension and compression testing device, including a bracket 100, the bracket 100 including a base frame 101 fixedly mounted on a table (not shown in the figure), a support frame 102 fixedly mounted along the upper outer surface of the base frame 101, a mounting frame 103 fixedly mounted at the upper position of the support frame 102, and an execution unit 300 fixedly mounted on the upper surface of the mounting frame 103, and a tension and compression sensor 302 fixedly connected to the end of the output shaft 301 of the execution unit 300;

[0028] Among them, such as Figure 3-4 As shown, in actual tensile and compressive testing, the workpiece to be tested is fixedly placed on the upper surface of the base frame 101. In tensile testing, a fixed rope or other fixed structure should be used to connect the tensile and compressive sensor 302 to the surface of the workpiece. Then, the execution unit 300 applies an upward tensile force. An output interface 303 is provided on the side of the tensile and compressive sensor 302, and a controller 200 is fixedly connected to the outer side wall of the support frame 102. The output interface 303 is electrically connected to the controller 200 to input the pressure signal of the tensile and compressive sensor 302 into the controller 200, so that the user can obtain tensile data in real time. In compressive testing, the workpiece to be tested is also placed on the upper surface of the base frame 101. The output shaft 301 of the execution unit 300 drives the tensile and compressive sensor 302 to press against the surface of the workpiece. The controller 200 is also used to obtain the pressure data.

[0029] Among them, such as Figure 1-2 As shown, in actual tensile and compressive tests, the tensile and compressive sensor 302 deforms under axial tensile and compressive forces, and the bracket 100 also deforms in the same way. Therefore, a deformation detection structure 400 is provided between the tensile and compressive sensor 302 and the base frame 101 of the bracket 100. This structure includes a grating ruler 401 mounted on the support frame 102, a slider 402 slidably mounted on the grating ruler 401, and a connecting rod 403 connecting the slider 402 and the tensile and compressive sensor 302 to fix them together for detecting deformation. The following section will further explain... Figure 3-4 To explain;

[0030] Figure 3For tensile testing, the tension / compression sensor 302 is fixedly connected to the test workpiece with a fixed rope. During the tensile test, the tension / compression sensor 302 bears a downward tension along the axial direction, while the base frame 101 receives an upward tension along the axial direction. The deformation generated by the tension / compression sensor 302 and the base frame 101 produces a displacement on the grating ruler 401 through the slider 402, and the specific value can be obtained.

[0031] like Figure 4 The pressure test is shown. First, the test workpiece is placed on the base frame 101. The output shaft 301 of the execution unit 300 is started to drive the tension and compression sensor 302 to perform a compression test on the workpiece. At this time, the base frame 101 will produce an axial downward deformation. Similarly, through the synchronous transmission of the connecting frame 403, the displacement value generated by the slider 402 on the grating ruler 401 is also obtained.

[0032] Using the displacement values ​​obtained above to eliminate the deformation caused by tensile and compressive tests can ensure the accuracy of tensile and compressive tests.

[0033] In one specific embodiment, such as Figure 5 As shown, the pressure signal of the tension / compression sensor 302 is input to the controller 200, and the controller 200 adjusts the tension / compression output of the execution unit 300 to the tension / compression sensor 302 to complete the servo control closed loop;

[0034] In addition, real-time position and pressure data can be displayed through the HMI (human-machine interface) in the controller 200, or transmitted to a local server via Ethernet for storage. This control method is a mature existing technology and is not the inventive point of this application, so it will not be described in detail in the text.

[0035] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A servo-driven tensile / compression testing device, characterized in that, include: Bracket (100); The execution unit (300) is fixedly mounted on the bracket (100); A tension / compression sensor (302) is mounted on the output shaft (301) of the actuator (300) and is used to compress / stretch the workpiece to be measured, which is fixedly mounted on the lower part of the bracket (100). The deformation detection structure (400) is respectively set on the tension / compression sensor (302) and the bracket (100). When the tension / compression testing device stretches / compresses the workpiece, it is used to detect the axial deformation of the tension / compression sensor (302) and the bracket (100) along the axial direction.

2. The servo tensile / compression testing device according to claim 1, characterized in that: The bracket (100) includes a base frame (101) fixedly mounted on the table surface. A support frame (102) is fixedly connected to the upper surface of the base frame (101). A mounting frame (103) is fixedly mounted at the upper part of the support frame (102). The execution unit (300) is fixed on the mounting frame (103).

3. The servo tensile / compression testing device according to claim 2, characterized in that: The deformation detection structure (400) includes a grating ruler (401), which is fixedly installed on the side wall of the support frame (102). A slider (402) is also slidably arranged on the grating ruler (401). A connecting rod (403) is also provided between the slider (402) and the tension / compression sensor (302), so that the tension / compression sensor (302) moves synchronously with the slider (402).

4. The servo tension / compression testing device according to claim 2, characterized in that: The tension / compression sensor (302) also has an output interface (303) located on its side. A controller (200) is also fixed on the outer sidewall of the support frame (102). The output interface (303) is electrically connected to the controller (200), and the controller (200) is also electrically connected to the execution unit (300).

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