Measuring device for steel bar test piece

Abstract

The utility model discloses a measuring device for a steel bar test piece, which comprises a bottom plate, a control system, a test piece weight measuring device and a test piece size measuring device, and the test piece weight measuring device is arranged on the bottom plate and positioned on the left side of the bottom plate; a test piece bracket is arranged on the test piece weight measuring device, a plurality of placing grooves are formed in the test piece bracket, and a plurality of test pieces are placed in the placing grooves in parallel; the test piece size measuring device is arranged on the bottom plate and located on the right side of the bottom plate and comprises a measuring frame and a plurality of measuring sensors located over test pieces, the number of the measuring sensors corresponds to that of the test pieces, the measuring sensors are arranged on the measuring frame, the measuring frame is driven by a horizontal driving device to slide left and right, and the sliding direction is parallel to the length direction of the test pieces; the test piece weight measuring device and the test piece size measuring device are connected with the control system. The test piece measuring device can measure the weight and the size of the test piece at the same time, the measuring efficiency is high, and measured data can be automatically uploaded to a control system.

Description

Technical Field

[0001] The utility model relates to a test piece measuring device, in particular to a measuring device for a tensile test piece in a material tensile test, and belongs to the technical field of test equipment. Background Art

[0002] Rebar refers to steel used for reinforced concrete and prestressed reinforced concrete. Its cross-section is circular, and sometimes square with rounded corners. In the process of construction, a large amount of rebar is needed to improve the stability of the building. Tensile strength is a very important technical indicator of rebar.

[0003] Before testing the sample, the sample cross section is usually measured manually, using common measuring tools such as vernier calipers, and then manually entering the corresponding computer software system. Obviously, manual measurement is not only cumbersome and inefficient, but also due to different techniques and visual errors of inspectors, it will bring large errors to the size measurement of the sample, low measurement accuracy, and greater influence of human factors. Different testers may record different data. Therefore, manual measurement of sample size not only seriously affects the test accuracy of the sample, but also reduces the test efficiency and has high labor intensity.

[0004] The steel bar test determination method also stipulates that the allowable deviation between the actual weight and theoretical weight of the steel bar should meet the requirements of the specification. When measuring the quality deviation of the steel bar, the test piece should be cut from different steel bars, the number should not be less than 5, and the length of each test piece should not be less than 500mm. At present, 5 sections of steel bar samples are usually cut, weighed separately, and then measured separately, and finally the weight per unit length of the steel bar to be tested is calculated to see if it meets the standard. This process requires multiple weighing and length measurement, which is inefficient, and the addition of multiple measurements is prone to errors.

[0005] Therefore, the existing steel bar tensile strength testing device cannot quickly weigh and measure the size of the steel bars at the same time, has poor applicability, and cannot keep up with the operating rhythm of the full-automatic testing machine, thereby reducing the overall testing efficiency. Summary of the invention

[0006] The utility model aims to overcome the deficiencies in the prior art and provide a measuring device for a steel bar test piece to solve the problems existing in the background technology.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A measuring device for a steel bar specimen comprises a control system, a specimen weight measuring device and a specimen size measuring device, and is characterized in that: it also comprises a base plate, the specimen weight measuring device is arranged on the base plate and located on the left side of the base plate; the specimen weight measuring device is provided with a specimen bracket, the specimen bracket is provided with a plurality of placement slots, and a plurality of specimens are placed in parallel in the placement slots; the specimen size measuring device is arranged on the base plate and located on the right side of the base plate, comprises a measuring frame and a plurality of measuring sensors located directly above the specimens and corresponding in number to the number of the specimens, the measuring sensors are arranged on the measuring frame, the measuring frame is driven by a horizontal driving device to slide left and right, and the sliding direction is parallel to the length direction of the specimen; the specimen weight measuring device and the specimen size measuring device are both connected to the control system.

[0009] By adopting the above technical solution, the specimen measuring device includes a specimen weight measuring device and a specimen size measuring device, which can measure the weight and size of the specimen at the same time, with high measurement efficiency, and the measurement data can be automatically uploaded to the control system.

[0010] In the above-mentioned measuring device for the steel bar specimen, the specimen weight measuring device is an S-type tension and compression weighing sensor.

[0011] In the above-mentioned measuring device for steel bar specimens, the specimen bracket includes a bracket plate whose lower part is connected to the specimen weight measuring device, and a left shelf and a right shelf are provided on the upper part of the bracket plate. The placement groove is arranged on the upper top surface of the left shelf and the right shelf, and the distance between the left shelf and the right shelf is less than the length of the shortest specimen.

[0012] By adopting the above technical solution, the specimen bracket includes a bracket plate and a left shelf and a right shelf arranged on the bracket plate. The upper top surfaces of the left shelf and the right shelf are provided with placement grooves, and the specimens are placed in the placement grooves, so that adjacent specimens are spaced apart, which is convenient for the specimen size measuring device to detect and also convenient for the specimen fixture to grab the specimen from between the left shelf and the right shelf.

[0013] Furthermore, a specimen positioning device is provided on the left side of the left shelf.

[0014] Furthermore, the positioning device includes a positioning cylinder and a positioning plate, the positioning plate is connected to the rod end of the positioning cylinder, and the height of the positioning plate is higher than the height of the axis of the specimen in the placement groove; the extension direction of the positioning cylinder piston rod is parallel to the length direction of the specimen, and the positioning surface of the positioning plate is perpendicular to the length direction of the specimen.

[0015] By adopting the above technical solution, a specimen positioning plate is arranged on the left side of the left shelf. Before loading, the piston rod of the positioning cylinder extends to the left, driving the specimen positioning plate away from the left shelf. The control system controls the robot to drive the specimen clamp to clamp the specimen from the specimen storage place, and then places the specimen into the placement slot. After a group of specimens are all placed on the specimen bracket, the control system controls the piston rod of the positioning cylinder to retract, driving the specimen positioning plate close to the left shelf, and at the same time making the left end of each specimen rest against the specimen positioning plate.

[0016] In the above-mentioned measuring device for the steel bar specimen, the horizontal driving device includes a linear guide pair, a driving motor and a lead screw pair, the linear guide of the linear guide pair is installed on the base plate, and the slider is installed at the lower part of the measuring frame; the driving motor is installed on the base plate, the lead screw of the lead screw pair is rotatably connected to the base plate, one end of the lead screw is connected to the driving motor, and the nut of the lead screw pair is connected to the lower part of the measuring frame.

[0017] Furthermore, the driving motor is a servo motor, the measuring sensor is a diffuse reflection photoelectric sensor, and the servo motor and the diffuse reflection photoelectric sensor are both connected to a control system. Beneficial Effects

[0018] The utility model of the steel bar test piece measuring device includes a test piece weight measuring device and a test piece size measuring device, which can measure the weight and size of the test piece at the same time, has high measurement efficiency, and is convenient for large batch measurement. Moreover, it effectively eliminates the error of human measurement, and the measurement data is accurate. The measurement data can be automatically uploaded to the control system, and the data is automatically recorded and calculated, and the results are accurate, which reduces the error of human calculation and increases the credibility of the data. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 , Figure 2 It is an overall schematic diagram of the utility model.

[0020] Figure 3 It is a main schematic diagram of the utility model.

[0021] Figure 4 It is a top view schematic diagram of the utility model.

[0022] Figure 5 It is a left side schematic diagram of the utility model.

[0023] Figure 6 It is a right side schematic diagram of the utility model.

[0024] Figure 7 It is a schematic diagram of the positioning cylinder, the positioning plate, the left shelf, and the left end of the test piece in the utility model.

[0025] Figure 8 This is a schematic diagram of the installation of the diffuse reflection photoelectric sensor in the utility model.

[0026] In the figure: 1 tool box, 2 bottom plate, 3 specimen weight measuring device, 4 bracket plate, 5 left shelf,

[0027] 6 specimen positioning device, 61 positioning cylinder, 62 positioning plate,

[0028] 7Right shelf,

[0029] 8 test piece size measuring device, 81 measuring frame, 82 measuring sensor, 83 linear guide pair, 84 driving motor, 85 lead screw pair, 86 bracket,

[0030] 9 test piece, 10 placement slot. DETAILED DESCRIPTION

[0031] In order to clearly illustrate the technical features of the present invention, the present invention is further described below through non-limiting embodiments in conjunction with the accompanying drawings.

[0032] The front, rear, left and right directions described in the present invention are described based on the front, rear, left and right directions shown in the accompanying drawings. For ease of description, only the parts related to the embodiments of the present invention are shown.

[0033] Please see Figures 1 to 7 A measuring device for a steel bar specimen comprises a control system (not shown in the figure), a specimen weight measuring device 3, a specimen size measuring device 8 and a bottom plate 2. In order to match with a robot, a testing machine, a sample storage rack, etc., a bracket or the like is arranged at the bottom of the bottom plate 2 to place the bottom plate 2 at an appropriate height. In this embodiment, a tool box 1 is used to store maintenance tools, etc.; the specimen weight measuring device 3 is arranged on the bottom plate 2 and is located on the left side of the bottom plate 2; in this embodiment, the specimen weight measuring device 3 adopts four S-type tension and pressure weighing sensors, and the S-type tension and pressure weighing sensors are connected to the control system. A bracket plate 4 is arranged on the top of the four S-type tension and pressure weighing sensors, and a left shelf 5 and a right shelf 7 are arranged on the top of the bracket plate 4. Six V-shaped placement grooves 10 are arranged on the upper top surfaces of the left shelf 5 and the right shelf 7, and the spacing between the two adjacent placement grooves 10 is equal. The distance between the left shelf 5 and the right shelf 7 is less than the shortest specimen length specified by the standard, and the specimen 9 is placed in the placement groove 10 in parallel. A specimen positioning device 6 is provided on the left side of the left shelf 5, specifically comprising a positioning cylinder 61 and a positioning plate 62, wherein the positioning plate 62 is connected to the rod end of the positioning cylinder 61, and the height of the positioning plate 62 is higher than the height of the axis of the specimen in the placement slot 10; the extension direction of the piston rod of the positioning cylinder 61 is parallel to the length direction of the specimen 9, and the positioning surface of the positioning plate 62 is perpendicular to the length direction of the specimen 9. In this embodiment, the positioning cylinder 61 adopts a three-axis cylinder, and the positioning cylinder 61 is connected to the left side of the left shelf 5. The three-axis cylinder is connected to the air source through a pipeline and an electromagnetic valve, and the electromagnetic valve is connected to the control system.

[0034] The specimen size measuring device 8 is arranged on the base plate 2 and is located on the right side of the base plate 2. It includes a measuring frame 81 and a plurality of measuring sensors 82 located directly above the specimens 9 and corresponding in number to the number of specimens. In this embodiment, the specimen size measuring device 8 is 6 measuring sensors 82 located directly above the specimens 9 and corresponding one to one to the specimens 9. The measuring sensors 82 are arranged on the measuring frame 81. The measuring frame 81 is driven by a horizontal driving device to slide left and right, and the sliding direction is parallel to the length direction of the specimen 9. In this embodiment, the measuring sensor 82 adopts a diffuse reflection photoelectric sensor, and the diffuse reflection photoelectric sensor is connected to the control system.

[0035] The horizontal driving device specifically includes a linear guide pair 83, a driving motor 84 and a lead screw pair 85. The linear guide of the linear guide pair 83 is installed on the base plate 2, and the slider is installed on the lower part of the measuring frame 81; the driving motor 84 is installed on the base plate 2, one end of the lead screw is connected to the driving motor 84, and the other end of the lead screw is rotatably connected to the base plate 2 through a bearing and a bearing seat, and the nut of the lead screw pair 85 is connected to the lower part of the measuring frame 81. Specifically, there are two sets of linear guide pairs 83, and the guide rails of the two sets of linear guide pairs 83 are respectively located on the front and rear sides of the specimen weight measuring device 3. The measuring frame 81 is a square structure, consisting of four frames of upper, lower, left and right. The right end of the specimen 9 can pass through the measuring frame 81, and the nut of the lead screw pair 85 is connected to the lower part of the measuring frame 81. Six diffuse reflection photoelectric sensors are installed on the upper frame of the measuring frame 81 through a bracket 86. The driving motor 84 adopts a servo motor, and the servo motor is connected to the control system.

[0036] After the diffuse reflection photoelectric sensor is installed, its angle and position need to be adjusted to ensure that the sensor's light beam can accurately illuminate the test piece 9, so as to achieve accurate detection results. The initial position of the positioning plate 62 is the position of the positioning plate 62 when the piston rod of the positioning cylinder 61 is retracted; the initial position of the measuring frame 81 is set: the distance between the diffuse reflection photoelectric sensor and the initial position of the positioning plate 62 is B0, and B0 is greater than the length of the longest test piece specified in the standard; the terminal position of the measuring frame 81 is set: the distance between the diffuse reflection photoelectric sensor and the initial position of the positioning plate 62 is Bn, and Bn is less than the length of the shortest test piece specified in the standard. According to the provisions of the current standard GB / T1499.2-2018, the length of the test sample shall not be less than 500mm. In this embodiment, Bn is 480mm and B0 is 820mm.

[0037] The measuring principle of the specimen length is as follows: first, the distance B0 between the diffuse reflection photoelectric sensor and the positioning plate 62 is set (i.e., the no-load distance of the measuring frame). When measuring the length of the specimen 9, the servo motor drives the measuring frame 81 to move to the left. The longest specimen in a group of specimens 9 first triggers its corresponding diffuse reflection photoelectric sensor. The control system automatically calculates the distance b1 (i.e., the load distance) that the measuring frame 81 (diffuse reflection photoelectric sensor) moves to the left according to the number of revolutions of the servo motor. The no-load distance minus the corresponding load distance is the length dimension of the specimen 9. The servo motor drives the measuring frame 81 to continue to move to the left. The second longest specimen 9 in a group of specimens 9 triggers its corresponding diffuse reflection photoelectric sensor. The control system automatically calculates the distance b2 (i.e., the load distance) that the measuring frame 81 (diffuse reflection photoelectric sensor) moves to the left according to the number of revolutions of the servo motor. The no-load distance minus the corresponding load distance is the length dimension of the specimen 9. And so on.

[0038] In this embodiment, the control system uses a host computer software + PLC control system, which is a prior art and will not be described in detail.

[0039] In this embodiment, before loading, the piston rod of the positioning cylinder 61 extends to the left, driving the specimen positioning plate 62 away from the left shelf 5, and the control system controls the robot to drive the sample clamp to clamp the specimen from the specimen storage rack, and then put the specimen 9 into the placement slot 10. After a group of specimens 9 are all placed on the specimen bracket, the control system controls the piston rod of the positioning cylinder 61 to retract, driving the specimen positioning plate 62 close to the left shelf 5, and at the same time making the left end of each specimen 9 abut against the specimen positioning plate 62. After that, the servo motor drives the measuring frame 81 to move to the left, and the longest specimen 9 in a group of specimens 9 first triggers its corresponding diffuse reflection photoelectric sensor. The control system automatically calculates the distance b1 (i.e., the load distance) that the measuring frame 81 (diffuse reflection photoelectric sensor) moves to the left according to the number of revolutions of the servo motor. The length dimension of the specimen 9 is obtained by subtracting the corresponding load distance from the no-load distance. The above actions are all controlled by the control system of the industrial computer; the specific control programming process is designed according to the characteristics of the test piece 9 to be measured and the needs of actual operation, and does not belong to the structural scope of the present invention. The circuit layout and connection to achieve control can be designed according to the hardware structure of the present invention, combined with the purpose of the action and with the help of common sense in the field of electronic control, so it will not be described in detail.

[0040] The working process of this measuring device:

[0041] (1) Initial state: the piston rod of the positioning cylinder 61 is retracted; the distance between the diffuse reflection photoelectric sensor on the measuring frame 81 and the initial position of the positioning plate 62 is B0;

[0042] (2) The piston rod of the positioning cylinder 61 extends;

[0043] (3) The robot drives the sample grabbing mechanism to grab the first sample 9 from the sample storage rack;

[0044] (4) The robot delivers the first sample to the placement slot 10 of the measuring device;

[0045] (5) Repeat steps (3)-(4) to place other test pieces 9 in a group of test pieces 9 into the placement slot 10 of the measuring device one by one;

[0046] (6) The robot drives the sample grabbing mechanism to return to the initial position;

[0047] (7) The S-type tension and compression load cell uploads the measured weight signal to the control system;

[0048] (8) The piston rod of the positioning cylinder 61 is retracted, and the left end of the test piece 9 abuts against the positioning plate 62;

[0049] (9) The servo motor drives the measuring frame 81 to move to the left. The longest specimen 9 in a group of specimens 9 first triggers its corresponding diffuse reflection photoelectric sensor. The control system automatically calculates the distance b1 (i.e., the load distance) that the measuring frame 81 (diffuse reflection photoelectric sensor) moves to the left according to the number of revolutions of the servo motor, and automatically uploads the measurement data to the control system.

[0050] (10) The control system calculates the length B1 of the first sample according to the following formula:

[0051] B1=B0-b1;

[0052] (11) Repeat steps (8) to (10), the servo motor drives the measuring frame 81 to continue to move leftward to the end position of the measuring frame 81, and measure the other test pieces 9 in the group of test pieces 9 one by one;

[0053] (12) If the measured length of at least one specimen in a group of specimens is less than the length of the shortest specimen specified in the standard, or at least one diffuse reflection photoelectric sensor is not triggered, the group of specimens is invalid;

[0054] If the length of each specimen in a group of specimens meets the length of the shortest specimen specified in the standard, the control system calculates according to the following formula and further determines the weight deviation of the specimens in this group:

[0055] The weight deviation is not more than 1% and it is qualified; the weight deviation is more than 1% and it is unqualified;

[0056] Weight deviation = (actual total weight of the sample - theoretical total weight of the sample) / theoretical total weight of the sample × 100%

[0057] The actual total weight of the sample is measured by step (7) and uploaded to the control system;

[0058] Theoretical total weight of the specimen = total length of the specimen × theoretical weight

[0059] The theoretical weight is input into the control system in advance according to the material and nominal diameter of the specimen, and the total length of the specimen is calculated cumulatively based on the actual measured length of each specimen in a group of specimens;

[0060] (13) The servo motor drives the measuring frame 81 to move rightward and return to the initial position;

[0061] (14) The piston rod of the positioning cylinder 61 extends;

[0062] (15) The robot drives the sample grabbing mechanism to place the qualified samples on the sample holder into the qualified material rack, and the invalid samples and unqualified samples are placed into the unqualified material box; according to the test cycle of the tensile testing machine, the qualified samples can also be sent to the test station of the tensile testing machine;

[0063] (16) Repeat steps (3) to (15) to measure the next set of specimens.

[0064] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "left", "right", "front", "back", "up", "down", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings. The above terms are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0065] Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0066] Except for the technical features described in the specification, all other technical features are known technologies to those skilled in the art.

[0067] The implementation methods listed above are only for the purpose of understanding the present invention and are not limitations on the technical solutions described in the present invention. Ordinary technicians in the relevant fields can make various changes or deformations based on the technical solutions described in the claims. All equivalent changes or deformations should be included in the scope of protection of the claims of the present invention.

Claims

1. A measuring device for a steel bar specimen, comprising a control system, a specimen weight measuring device and a specimen size measuring device, characterized in that: It also includes a base plate, and the specimen weight measuring device is arranged on the base plate and located on the left side of the base plate; the specimen weight measuring device is provided with a specimen bracket, and the specimen bracket is provided with a plurality of placement slots, and a plurality of specimens are placed in parallel in the placement slots; the specimen size measuring device is arranged on the base plate and located on the right side of the base plate, and includes a measuring frame and a plurality of measuring sensors located directly above the specimens, the number of which corresponds to the number of specimens, the measuring sensors are arranged on the measuring frame, and the measuring frame is driven by a horizontal driving device to slide left and right, and the sliding direction is parallel to the length direction of the specimen; the specimen weight measuring device and the specimen size measuring device are both connected to the control system.

2. The measuring device for a steel bar specimen according to claim 1, characterized in that: The test piece weight measuring device is an S-type tension and compression weighing sensor.

3. The measuring device for a steel bar specimen according to claim 1, characterized in that: The specimen bracket includes a bracket plate whose lower part is connected to the specimen weight measuring device, and a left shelf and a right shelf are provided on the upper part of the bracket plate. The placement groove is arranged on the upper top surface of the left shelf and the right shelf, and the distance between the left shelf and the right shelf is less than the length of the shortest specimen.

4. The measuring device for a steel bar specimen according to claim 3, characterized in that: A test piece positioning device is provided on the left side of the left shelf.

5. The measuring device for a steel bar specimen according to claim 4, characterized in that: The positioning device includes a positioning cylinder and a positioning plate, the positioning plate is connected to the rod end of the positioning cylinder, and the height of the positioning plate is higher than the height of the axis of the specimen in the placement groove; the extension direction of the positioning cylinder piston rod is parallel to the length direction of the specimen, and the positioning surface of the positioning plate is perpendicular to the length direction of the specimen.

6. The measuring device for a steel bar specimen according to claim 1, characterized in that: The horizontal driving device includes a linear guide pair, a driving motor and a lead screw pair. The linear guide of the linear guide pair is installed on the base plate, and the slider is installed at the lower part of the measuring frame; the driving motor is installed on the base plate, the lead screw of the lead screw pair is rotatably connected to the base plate, one end of the lead screw is connected to the driving motor, and the nut of the lead screw pair is connected to the lower part of the measuring frame.

7. The measuring device for a steel bar specimen according to claim 6, characterized in that: The driving motor is a servo motor, the measuring sensor is a diffuse reflection photoelectric sensor, and both the servo motor and the diffuse reflection photoelectric sensor are connected to a control system.

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