Force value calibration device of relaxation testing machine

Abstract

The utility model relates to a force value calibration device for a relaxation testing machine, which comprises a standard tension sensor, connecting rod assemblies are respectively and fixedly arranged on two opposite sides of the standard tension sensor, and each connecting rod assembly is provided with a connecting end used for being connected with a holding end of the relaxation testing machine. When the relaxation testing machine works, the tension value of the relaxation testing machine is detected through the standard tension sensor. The connecting rod assembly is connected with the holding end of the relaxation testing machine during use, online calibration is achieved, and compared with the mode that a sensor of the relaxation testing machine is detached for calibration, the working condition during calibration is the actual working condition, and the accuracy is high. And the connecting rod assembly and the standard tension sensor do not collide with each other and are not influenced by collision force, so that the calibration result is more accurate. In addition, the connecting rod assembly is light in weight, the influence on the calibration result is small no matter the connecting rod assembly is applied to the vertical relaxation testing machine or the horizontal relaxation testing machine, and the calibration accuracy is improved.

Description

Technical Field

[0001] The utility model generally relates to the technical field of equipment calibration, and more specifically relates to a force value calibration device for a relaxation testing machine. Background Art

[0002] A relaxation tester is a device used to detect material stress relaxation. Its principle is to heat a specimen to a specified temperature, maintain a constant tensile strain at this temperature, and measure the specimen's residual stress. The accuracy of the force measurement directly determines the accuracy of the test results. Since a relaxation tester uses a sensor to measure force, the accuracy of the sensor determines the accuracy of the test results. Regular sensor calibration is required during use.

[0003] Currently, relaxation testing machines are primarily divided into horizontal and vertical types. Horizontal relaxation testing machines generally require the sensor to be removed for force calibration, while vertical relaxation testing machines generally require a reaction frame for sensor calibration. This method of removing the sensor for force calibration, because the sensor is separated from the relaxation testing machine, results in discrepancies between the operating conditions during calibration and actual use, making it difficult to determine the true accuracy.

[0004] The structure of the reaction frame is mostly as shown in the utility model patent with authorization announcement number CN216559993U, which includes a fixed frame and a movable frame. The fixed frame includes an upper frame, a left frame, a right frame and a lower frame. The movable frame includes a top frame, a guide column and a base. The guide column passes through the upper frame, and the base is located between the upper frame and the lower frame. Connectors are respectively fixed on the lower frame and the top frame, and the connectors are used to connect to the testing machine. When in use, a standard pressure sensor is placed between the base and the upper frame, and the tensile force of the testing machine is converted into a pressure force between the base and the upper frame. The value of the standard pressure sensor is compared with the value of the testing machine to calibrate the sensor of the testing machine. However, the reaction frame also has some disadvantages: the reaction frame itself is very bulky, time-consuming and labor-intensive to install, the installation is dangerous, and the work efficiency is low. In addition, the weight of the reaction frame itself and the force generated by the collision between the various components of the reaction frame will also have a certain impact on the accuracy of the calibration. Utility Model Content

[0005] In view of this, the purpose of the present invention is to provide a force value calibration device for a relaxation testing machine, so as to solve the technical problem in the prior art that the calibration result is inaccurate when the sensor is removed for calibration or when a reaction frame is used for calibration.

[0006] To achieve the above-mentioned object, the present invention provides a relaxation testing machine force value calibration device that adopts the following technical solution: a relaxation testing machine force value calibration device, comprising a standard tensile force sensor, connecting rod assemblies fixed to opposite sides of the standard tensile force sensor, each connecting rod assembly having a connecting end for connecting to a holding end of the relaxation testing machine, so that the tension value of the relaxation testing machine can be detected by the standard tensile force sensor when the relaxation testing machine is working;

[0007] The standard tension sensor is threadedly assembled with the corresponding connecting rod assembly;

[0008] At least one of the two connecting rod assemblies includes two or more detachably connected connecting rods, any two adjacent connecting rods are threadedly assembled together, and one of the connecting rods is welded to the standard tension sensor;

[0009] A connecting nut is rotatably and anti-looseningly mounted on the connecting end of the connecting rod assembly, and the connecting nut is used for being screwed onto the holding end of the slack testing machine.

[0010] The beneficial effects are as follows: connecting rod assemblies are fixedly provided on both sides of the standard tensile sensor, and the connecting rod assemblies are connected to the holding ends of the relaxation testing machine when in use, thereby realizing online calibration. Compared with the method of removing the sensor of the relaxation testing machine for calibration, the working conditions during calibration are actual working conditions, and the accuracy is higher. In the present invention, the connecting rod assembly and the standard tensile sensor are fixedly provided, there is no collision between them, and they will not be affected by the collision force, so the calibration result is more accurate. In the present invention, a connecting rod assembly is used to connect the relaxation testing machine and the standard tensile sensor. The connecting rod assembly is light in weight, and has little effect on the calibration result whether it is used on a vertical relaxation testing machine or a horizontal relaxation testing machine, thereby improving the accuracy of calibration. The initial spacing between the two holding ends in relaxation testing machines of different specifications is different. At least one connecting rod assembly is detachably connected to the standard force sensor, and the connecting rod assembly of appropriate length can be replaced according to the different specifications of the relaxation testing machine, thereby improving the versatility of the relaxation testing machine force calibration device of the present invention. The threaded connection has the advantage of convenient disassembly. The initial spacing between the two holding ends varies in different slack testing machines. Two or more connecting rods can be detachably connected to form a connecting rod assembly. The number and length of connecting rods can be optimally selected based on the specific slack testing machine, enhancing the versatility of the slack testing machine force calibration device. The threaded connection offers the advantage of easy disassembly. The connecting nut is rotatably and securely mounted on the connecting rod assembly. When the connecting rod assembly is connected to the slack testing machine, only the connecting nut rotates; neither the connecting rod assembly nor the standard tensile sensor rotates, making installation more convenient.

[0011] As a further improvement, the slack testing machine force calibration device also includes a locking nut, which is threaded onto one of the connecting rod assembly and the standard tension sensor and presses against the other. The locking nut improves the connection reliability between the connecting rod assembly and the standard tension sensor and prevents slight movement between the connecting rod assembly and the standard tension sensor.

[0012] As a further improvement, the connecting rod assembly also includes a locking nut that is threaded onto one of any two adjacent connecting rods and presses against the other of any two adjacent connecting rods. The locking nut improves the connection reliability between adjacent connecting rods and prevents slight movement between the adjacent connecting rods.

[0013] As a further improvement, the force calibration device of the relaxation testing machine includes a force display instrument, which is connected to the standard tension sensor via a cable. The force display instrument can more intuitively show the magnitude of the force value. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and other objects, features and advantages of the exemplary embodiments of the present application will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0015] Figure 1 It is a schematic diagram of Example 1 of the force value calibration device of the relaxation testing machine of the present invention.

[0016] Explanation of the accompanying symbols: 1. Standard tensile sensor; 2. Force value display instrument; 3. First connecting rod assembly; 4. Second connecting rod assembly; 5. Sensor connecting rod; 6. Testing machine connecting rod; 7. Locking nut; 8. Connecting nut. DETAILED DESCRIPTION

[0017] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0018] The force value calibration device of the relaxation testing machine of the utility model adopts a fixed connection method between a standard tension sensor and a rod body, the overall weight is light, and disassembly and assembly are relatively convenient. There will be no relative movement between the standard tension sensor and the rod body, avoiding interference of the relative movement on the measurement result.

[0019] After introducing the basic principles of the present invention, various non-limiting embodiments of the present invention are described in detail below. The numbers of any elements in the drawings are for illustration only and not for limitation, and any names are for distinction only and do not have any limiting meaning.

[0020] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0021] Example 1 of the force calibration device for a relaxation testing machine provided by the utility model:

[0022] like Figure 1 As shown, the relaxation testing machine force calibration device (hereinafter referred to as the calibration device) is used to be installed between the two holding ends of the relaxation testing machine. Through the stretching of the two holding ends, the value can be displayed on the standard tension sensor 1 of the calibration device. By comparing the value of the standard tension sensor 1 and the value on the relaxation testing machine, the accuracy of the measurement data on the relaxation testing machine can be judged.

[0023] The calibration device includes a standard tension sensor 1, which is connected to a force display instrument 2 via a cable. This instrument displays the force value of the standard tension sensor 1 in real time. Connecting rod assemblies are mounted on opposite sides of the standard tension sensor 1. These connecting rod assemblies are defined as a first connecting rod assembly 3 and a second connecting rod assembly 4, respectively. These two connecting rod assemblies have identical structures.

[0024] The connecting rod assembly includes a sensor connecting rod 5 and a testing machine connecting rod 6. One end of the sensor connecting rod 5 is connected to the standard tensile sensor 1, and the other end is connected to the testing machine connecting rod 6. One end of the testing machine connecting rod 6 is connected to the sensor connecting rod 5, and the other end is used to connect to the holding end of the slack testing machine. The standard tensile sensor 1, the sensor connecting rod 5, and the testing machine connecting rod 6 are all threadedly connected. Specifically, one end of the sensor connecting rod 5 is externally threaded, and a locking nut 7 is also threadedly assembled on this end of the sensor connecting rod 5. After this end is threaded through the standard tensile sensor 1, the locking nut 7 is used to press against the standard tensile sensor 1 for locking. One end of the testing machine connecting rod 6 is externally threaded, and a locking nut 7 is also threadedly assembled on this end of the testing machine connecting rod 6. After this end is threaded through the sensor connecting rod 5, the locking nut 7 is used to press against the sensor connecting rod 5 for locking. The other end of the tester connecting rod 6 is mounted with a connecting nut 8. This nut 8 and the tester connecting rod 6 are rotatably and securely assembled together. During use, the connecting nut 8 is threaded onto the retaining end of the slack tester, connecting the tester connecting rod 6 and the slack tester together. The structure of the connecting nut 8 is conventional and is commonly used at the end of a bellows in a toilet. Its detailed structure is omitted here.

[0025] In this embodiment, since the testing machine connecting rod 6 and the sensor connecting rod 5 are threadedly assembled together, in actual use, different lengths of testing machine connecting rods 6 can be selected according to the installation space in the relaxation testing machine, which not only improves the versatility of the calibration device, but also eliminates the need to frequently replace the sensor connecting rod 5, thereby reducing costs.

[0026] During use, a tester connecting rod 6 of an appropriate length is selected based on the initial distance between the two holding ends of the slack tester. The connecting rod 6 is then connected to the sensor connecting rod 5 and the holding end of the slack tester, and then stretched for calibration. It should be noted that in actual use, only the connecting rod 6 of one of the first connecting rod assembly 3 and the second connecting rod assembly 4 can be changed to accommodate the initial distance between the two holding ends of slack testers of different specifications.

[0027] In this embodiment, the ends of the first connecting rod assembly 3 and the second connecting rod assembly 4 on which the connecting nuts 8 are installed are the connecting ends connected to the holding ends of the slack testing machine.

[0028] Example 2 of the force calibration device for a relaxation testing machine provided by the utility model:

[0029] The main difference between this embodiment and Example 1 is that, in Example 1, the relaxation testing machine force calibration device includes a force display instrument 2, which is connected to the standard tension sensor 1 via a cable and is used to intuitively display the tension value of the standard tension sensor 1. In this embodiment, the force display instrument is eliminated, and the standard tension sensor has its own communication function, directly transmitting the force value to a data acquisition device such as a computer.

[0030] Example 3 of the force calibration device for a relaxation testing machine provided by the present invention:

[0031] The main difference between this embodiment and Example 1 is that in Example 1, the testing machine connecting rod 6 and the sensor connecting rod 5, as well as the sensor connecting rod 5 and the standard tension sensor 1, are both threadedly connected and locked by a lock nut 7. In this embodiment, the lock nut is eliminated, and the testing machine connecting rod and the sensor connecting rod, as well as the sensor connecting rod and the standard tension sensor, are connected solely by their own threads.

[0032] Example 4 of the force calibration device for a relaxation testing machine provided by the utility model:

[0033] This embodiment differs from Example 1 primarily in that, in Example 1, the connecting rod assembly includes a sensor connecting rod 5 and a testing machine connecting rod 6. In this embodiment, the connecting rod assembly includes three connecting rods, with any two adjacent connecting rods being removably fixedly connected. In other embodiments, the connecting rod assembly includes only one connecting rod, one end of which is connected to a standard tensile sensor and the other end is connected to a slack testing machine.

[0034] Although this specification has shown and described a plurality of embodiments of the present invention, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art will conceive of many modifications, changes, and alternatives without departing from the ideas and spirit of the present invention. It should be understood that in practicing the present invention, various alternatives to the embodiments of the present invention described herein may be adopted. The appended claims are intended to define the scope of protection of the present invention and therefore cover modular compositions, equivalents, or alternatives within the scope of protection of these claims.

Claims

1. A relaxation testing machine force calibration device, characterized in that: The standard tensile sensor comprises a connecting rod assembly fixed on opposite sides of the standard tensile sensor, each connecting rod assembly having a connecting end for connecting to a holding end of a relaxation tester, so that the tension value of the relaxation tester can be detected by the standard tensile sensor when the relaxation tester is working; The standard tension sensor is threadedly assembled with the corresponding connecting rod assembly; At least one of the two connecting rod assemblies includes two or more detachably connected connecting rods, any two adjacent connecting rods are threadedly assembled together, and one of the connecting rods is welded to the standard tension sensor; A connecting nut is rotatably and anti-looseningly mounted on the connecting end of the connecting rod assembly, and the connecting nut is used for being screwed onto the holding end of the slack testing machine.

2. The relaxation testing machine force calibration device according to claim 1, characterized in that: The force value calibration device of the relaxation testing machine also includes a locking nut, which is used to be screwed on one of the connecting rod assembly and the standard tension sensor and pressed on the other of the connecting rod assembly and the standard tension sensor.

3. The force calibration device for a relaxation testing machine according to claim 1, characterized in that: The connecting rod assembly further comprises a locking nut, which is used to be screwed onto one of any two adjacent connecting rods and pressed onto the other of any two adjacent connecting rods.

4. The force calibration device for a relaxation testing machine according to claim 1, characterized in that: The force value calibration device of the relaxation testing machine includes a force value display instrument, which is connected to the standard tension sensor through a cable.

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