System for reinforcing steel bar tensile test

Abstract

The utility model discloses a system for reinforcing steel bar tensile test, which comprises two reinforcing steel bar tensile testing machines with different measuring ranges, a video extensometer component is arranged on the rear side of each reinforcing steel bar tensile testing machine, and a robot clamping jaw for grabbing a reinforcing steel bar test piece is arranged in front of the two reinforcing steel bar tensile testing machines. Within the grabbing range of the robot clamping jaw, a material frame for storing the reinforcing steel bar test pieces, a weight deviation measuring instrument for measuring the reinforcing steel bar test pieces, a temporary storage frame for storing the measured reinforcing steel bar test pieces and a movable material frame for storing the stretched reinforcing steel bar test pieces are arranged. According to the utility model, the problems of high labor intensity, low efficiency and accuracy and potential safety hazards to operators in the manual operation in the existing steel bar tensile test are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of steel bar tensile testing, in particular to a system for steel bar tensile testing. Background Art

[0002] The test to determine a series of characteristics of steel bar materials under tensile load, also known as tensile test, is mainly used to check whether the steel bar materials meet the specified standards and study the performance of the materials. At present, most of the steel bar tensile test processes still use the method of manually loading and unloading steel bar specimens. The operator first measures the weight and size of the steel bar specimen, and then places the steel bar specimen in the steel bar tensile testing machine for tensile strength test. After the test, the steel bar specimen is manually taken out, and the next steel bar specimen is moved again to repeat the above operation. There are disadvantages such as high labor intensity and low efficiency in operation, as well as safety hazards to operators. At the same time, the size and weight of the steel bar specimens measured manually may be biased, affecting the accuracy of the tensile test results. Utility Model Content

[0003] Purpose of the utility model: The purpose of the utility model is to provide a system for steel bar tensile testing, which is used to improve the efficiency and accuracy of steel bar tensile testing.

[0004] Technical solution: To achieve the above-mentioned purpose, the utility model discloses a system for steel bar tensile testing, comprising two steel bar tensile testing machines with different measuring ranges, a video extensometer assembly is arranged at the rear side of each steel bar tensile testing machine, a robot gripper for grabbing steel bar specimens is arranged in front of the two steel bar tensile testing machines, and within the grabbing range of the robot gripper, there are respectively arranged a material rack for storing steel bar specimens, a weight deviation measuring instrument for measuring the steel bar specimens, a cache rack for storing measured steel bar specimens, and a mobile material frame for storing stretched steel bar specimens.

[0005] The video extensometer assembly is used to measure the stress deformation position and its changing process of the steel bar specimen in the steel bar tensile testing machine.

[0006] The robot gripper can grasp multiple steel bar specimens at the same time, can rotate over a large range in the horizontal direction, and can adjust the height of the gripper in the vertical direction.

[0007] The material rack is a multi-layer structure, with steps on both sides of each layer, which are used to place the same group of steel bar specimens and limit the length range of the steel bar specimens.

[0008] The same group includes a plurality of steel bar specimens cut from the same initial long steel bar, and each steel bar specimen is affixed with an identification code containing its information.

[0009] Among them, a bracket for placing the steel bar specimen is fixed on the lower side of the weight deviation measuring instrument, a weighing sensor is arranged below the bracket, and a camera lens assembly for scanning the identification code and measuring the length of the steel bar specimen is arranged above the bracket.

[0010] The buffer rack is divided into two upper and lower areas according to the measurement results of the steel bar specimens, which correspond to the tensile ranges of two steel bar tensile testing machines respectively.

[0011] The system also includes an oil source cabinet that provides power for the normal operation of each device in the system, a programmable control cabinet that monitors and controls the working conditions of the entire system, and a robot control cabinet that adjusts the working mode of the robot gripper.

[0012] Beneficial effects: The utility model has the following advantages: 1. The system uses robot grippers to quickly and accurately pick up and place steel bar specimens between other equipment, with high automation integration and strong flexibility, which reduces the labor intensity of operators, improves operating efficiency, and further solves the safety hazards caused by manual operation;

[0013] 2. This system first uses a weight deviation measuring instrument to measure the steel bar specimens, thereby eliminating unqualified specimens and improving the accuracy of the steel bar tensile test;

[0014] 3. This system uses the video extensometer assembly to synchronously measure the stress and deformation of the steel bar specimen in the steel bar tensile testing machine, thereby providing a basis for the performance analysis of the steel bar specimen. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the schematic diagram of the system structure;

[0016] Figure 2 It is a schematic diagram of the material rack structure;

[0017] Figure 3 This is a schematic diagram of the structure of the weight deviation measuring instrument. DETAILED DESCRIPTION

[0018] The technical solution of the utility model is described in detail below in conjunction with the embodiments and drawings.

[0019] like Figure 1 As shown, the system includes two steel bar tensile testing machines 1 with different measuring ranges. A video extensometer assembly 2 is arranged at the rear side of each steel bar tensile testing machine 1 to measure the stress deformation position and its change process of the steel bar in the steel bar tensile testing machine 1, and upload the measurement results to the main control system. A robot gripper 3 is arranged in front of the two steel bar tensile testing machines 1. The robot gripper 3 can grab multiple steel bar specimens at the same time, and can rotate in a wide range in the horizontal direction. In the vertical direction, the height of the gripper can be adjusted according to the height of each device in the system.

[0020] In the grasping range of the robot gripper 3, a material rack 4, a weight deviation measuring instrument 5, a buffer rack 6, and a mobile material frame 7 are respectively arranged. Figure 2 As shown, the rack 4 is a multi-layer structure, with steps on both sides of each layer. The steps on both sides have a length range calibration function, and steel bar specimens that are not within a certain length range cannot be placed on the rack steps. Five steel bar specimens can be placed, which is called a group. The steel bar specimens in each group are cut from the same initial long steel bar, and each steel bar specimen is affixed with an identification code, which contains the number, diameter, strength and other information of the steel bar specimen.

[0021] The weight deviation measuring instrument 5 is used to identify the identification code of the steel bar specimen, measure the length and weigh the steel bar specimen, and upload the measurement results to the main control system. Figure 3 As shown, a bracket 5.1 for placing steel bar specimens is fixed below the weight deviation measuring instrument 5, a weighing sensor 5.2 is arranged below the bracket 5.1, and a group of steel bar specimens can be measured simultaneously, and a camera lens assembly 5.3 for scanning identification codes and measuring the length of the steel bar specimens is arranged above the bracket 5.1.

[0022] The buffer rack 6 is used to place steel bar specimens that have passed the length measurement and weighing, and includes two upper and lower areas, which correspond to two steel bar tensile testing machines 1 respectively. That is, the main control system determines which steel bar tensile testing machine 1 the steel bar specimen is suitable for based on the measurement results of the weight deviation measuring instrument 5, and then places the steel bar specimen in the corresponding area of ​​the buffer rack 6. If the steel bar specimen can be applied to the range of two steel bar tensile testing machines 1 at the same time, it will be allocated to the area with fewer steel bar specimens according to the number of steel bar specimens placed in the two areas. The mobile material frame 7 is used to place steel bar specimens after the tensile test.

[0023] In addition, the system is also provided with a power oil source cabinet 8 for the normal operation of other devices in the system, a program control cabinet 9 for monitoring and controlling the working condition of the entire system, and a robot control cabinet 10 for adjusting the working mode of the robot gripper 3. The program control cabinet 9 includes the above-mentioned main control system, which includes a display screen for displaying the received or calculated measurement results and the working condition of the entire system.

[0024] How the system works:

[0025] (1) After affixing identification codes to each group of steel bar specimens, they are placed on the rack 4 in order of the test. The robot gripper 3 is started to grab a group of steel bar specimens (3 / 2) on the top layer of the rack 4 twice, and the group of steel bar specimens is sent to the bracket 5.1 of the weight deviation measuring instrument 5. After the main control system receives the identification information scanned by the camera lens assembly 5.3, the weighing sensor 5.2 weighs the group of steel bar specimens, and the camera lens assembly 5.3 measures the length of each steel bar. The main control system determines whether the measurement results meet the requirements of the tensile test. If unqualified, the robot gripper 3 grabs the group of steel bar specimens back to the original position of the rack 4. If qualified, the robot gripper 3 first grabs any 3 steel bar specimens to the original position of the rack 4 as reserved samples, and grabs the remaining 2 to the cache rack 6.

[0026] The judgment method is: first use the weighing sensor 5.2 to weigh the total weight of the group of steel bar specimens (5 pieces), and then use the camera lens assembly 5.3 to measure the length of each steel bar specimen to calculate the total length of the group of steel bar specimens. According to the size specifications of the measured steel bars, whether the deviation between the theoretical weight and the actual total weight of the measured total length is within the range specified by the national standard, it is judged whether the group of steel bar specimens is qualified.

[0027] (2) The robot gripper 3 grabs the steel bar specimens on the buffer rack 6 one by one and places them into the jaw device of the corresponding tensile testing machine 1 for tensile testing. The video extensometer assembly 2 at the rear of the tensile testing machine 1 synchronously measures the stress deformation position and its change process of the steel bar specimen and uploads them to the main control system; the tensile testing machine 1 also uploads the tensile force value that changes with time during the stretching process to the main control system.

[0028] (3) After the steel bar specimen is stretched, it is grabbed by the robot gripper 3 and placed in the mobile material frame 7.

[0029] (4) Performance analysis of steel bar specimens: Based on the length, weight, diameter, strength information of the steel bar specimens before the test, the deformation position and deformation process during the test, the tensile force value changing with time, and the state of the steel bar specimens after the test, analyze whether the maximum elongation and post-tensile strength of the steel bar specimens meet the standard requirements.

Claims

1. A system for steel bar tensile testing, characterized in that: The invention comprises two steel bar tensile testing machines (1) with different measuring ranges. A video extensometer assembly (2) for measuring the stress deformation position and the change process of a steel bar specimen in the steel bar tensile testing machine (1) is arranged at the rear side of each steel bar tensile testing machine (1). A robot gripper (3) for grabbing the steel bar specimen is arranged in front of the two steel bar tensile testing machines (1). Within the grabbing range of the robot gripper (3), a material rack (4) for storing the steel bar specimen, a weight deviation measuring instrument (5) for measuring the steel bar specimen, a buffer rack (6) for storing the measured steel bar specimen, and a movable material frame (7) for storing the stretched steel bar specimen are arranged respectively.

2. The system for steel bar tensile testing according to claim 1, characterized in that: The robot gripper (3) can grasp a plurality of steel bar test pieces at the same time, and can rotate in the horizontal direction, and can adjust the height of the gripper in the vertical direction.

3. The system for steel bar tensile testing according to claim 1, characterized in that: The material rack (4) is a multi-layer structure, with steps provided on both sides of each layer for placing the same group of steel bar test pieces and limiting the length range of the steel bar test pieces.

4. The system for steel bar tensile testing according to claim 3, characterized in that: The same group includes 5 steel bar specimens cut from the same initial long steel bar, and each steel bar specimen is affixed with an identification code containing its information.

5. The system for steel bar tensile testing according to claim 4, characterized in that: A bracket (5.1) for placing a steel bar specimen is fixed on the lower side of the weight deviation measuring instrument (5), a weighing sensor (5.2) is provided below the bracket (5.1), and a camera lens assembly (5.3) for scanning an identification code and measuring the length of the steel bar specimen is provided above the bracket (5.1).

6. The system for steel bar tensile testing according to claim 1, characterized in that: The buffer rack (6) is divided into two upper and lower areas according to the measurement results of the steel bar test pieces, which respectively correspond to the tensile ranges of the two steel bar tensile testing machines (1).

7. The system for steel bar tensile testing according to claim 1, characterized in that: The system also includes an oil source cabinet (8) for providing power for the normal operation of each device in the system, a program control cabinet (9) for monitoring and controlling the working conditions of the entire system, and a robot control cabinet (10) for adjusting the working mode of the robot gripper (3).

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