A tensile test device for the bolts of the inserts of a low-voltage metering box

Abstract

The present invention relates to a tensile force testing device for the insert bolts of a low-voltage metering box, which is characterized in that it comprises a support plate, a sliding mechanism, a clamping mechanism and a force measuring mechanism. The force measuring mechanism is installed on the support plate through the sliding mechanism, and the clamping mechanism is arranged in front of the force measuring mechanism. The structure of the present invention is scientifically and reasonably designed, and has the advantages of convenient operation, improved testing efficiency, ensuring stability during testing, and being easy to implement. It is a tensile force testing device for the insert bolts of a low-voltage metering box with high innovation.

Description

Technical Field

[0001] The invention belongs to the technical field of low-voltage metering box verification, and relates to a detection component for the insert bolts on a low-voltage metering box, in particular to a tensile test device for the insert bolts of a low-voltage metering box. Background Art

[0002] As the basis for trade settlement of each interconnected power grid, the reliability of metering equipment affects the reliability and safety of smart power grids and residential electricity consumption. However, with the popularization of the global energy Internet, metering equipment has become more and more popular, and the natural environment in which the equipment is applied has gradually become diversified. Under harsh natural environments, metering equipment often fails. As the protective shell of smart electricity meters, acquisition terminals, disconnect switches, circuit breakers, etc., the low-voltage metering box ensures fair, just, and accurate metering, and is also the first line of defense to ensure the life and property safety of users in case of short circuits and fires. Therefore, its product quality, service life, etc. need to be strictly controlled.

[0003] According to the general technical specifications for low-voltage metering boxes issued by the State Grid, the low-voltage metering box needs to pass performance tests before leaving the factory, including the tensile test of the insert bolts of the low-voltage metering box.

[0004] In order to facilitate the installation of electrical devices inside the low-voltage metering box, insert bolts need to be installed inside it. For a low-voltage metering box body made of non-metallic materials, it is necessary to test whether the metal inserts connected by threads on it are stable to ensure its safe use.

[0005] According to the method of 8.2.101.4 in GB7251.5—2008, apply the corresponding load to the tested threaded connection. If the metal threaded insert does not loosen, damage, remains in its original position, and there are no cracks in the surrounding material of the insertion hole, it is considered to have passed the test.

[0006] For the existing test of the inserts on the low-voltage metering box, there is no special test tool. When applying force, the chuck is easy to slip off the insert, which is more inconvenient to operate and affects the test efficiency and effect. Summary of the Invention

[0007] The purpose of the invention is to solve the deficiencies of the existing technology and provide a tensile test device for the insert bolts of a low-voltage metering box, which is convenient to operate, improves the test efficiency, ensures stability during testing, and is easy to implement.

[0008] The invention solves its technical problems through the following technical solutions:

[0009] A low-voltage metering box insert bolt tensile test device, characterized in that it includes a support plate, a sliding mechanism, a clamping mechanism and a force measuring mechanism. The force measuring mechanism is installed on the support plate through the sliding mechanism, and the clamping mechanism is arranged in front of the force measuring mechanism; the support plate is a horizontally arranged plate body with an L-shaped cross-section. The sliding mechanism is composed of a sliding plate, a gripper connecting plate, a sliding stop block and a fixed stop block. The sliding plate is slidably installed on the horizontal plane of the L-shaped plate body. Sliding stop blocks are symmetrically installed on both sides of the front end of the sliding plate. A gripper connecting plate perpendicular to it is jointly installed at the front of the two sliding stop blocks. A fixed stop block for limiting the sliding stop block is installed on the horizontal plane of the support plate at the rear end of the sliding plate; the clamping mechanism is composed of a gripper and jaws installed on both sides of the gripper; the force measuring mechanism is mainly composed of a tension spring and a force measuring sensor. A force measuring sensor is installed on the inner side surface of the gripper connecting plate. The force measuring sensor is connected to a spring connecting piece through a force measuring joint. A tension spring is connected to the spring connecting piece. The other end of the tension spring is connected to the vertical surface of the L-shaped plate body through a spring connecting piece.

[0010] Moreover, a reinforcing plate is also installed on the support plate, and the reinforcing plate is arranged at the included angle on both sides of the L-shaped plate body.

[0011] Moreover, the jaws are composed of two L-shaped jaw bodies. The vertical part of the L-shaped jaw body is connected to the gripper. A slope structure is machined on the upper end surface of the horizontal part of the L-shaped jaw body, and the slope structure is a structure with a higher outer side and a lower inner side.

[0012] Moreover, a positioning mechanism is also included. The positioning mechanism is composed of a thimble holder and a cross laser head. A thimble holder is installed in the middle of the gripper, and a cross laser head is installed at the center position of the front end of the thimble holder.

[0013] Moreover, a floating positioning mechanism is also included. The floating positioning mechanism is composed of an adjusting fixed block, an oil-free linear slider, a cylinder connecting plate, a compression spring and a cover plate. An adjusting fixed block is installed at the front part of the gripper connecting plate. An installation groove is provided on the front end surface of the adjusting fixed block. An oil-free linear slider is installed in the installation groove. A cylinder connecting plate is installed in the adjusting fixed block on the oil-free linear slider. The periphery of the cylinder connecting plate is limited on the four inner walls of the adjusting fixed block by compression springs. A cover plate connected to the adjusting fixed block is installed at the front end of the cylinder connecting plate. A through hole for passing the upper cylinder of the gripper is provided in the middle of the cover plate, and the bottom of the cylinder is connected to the end surface of the cylinder connecting plate.

[0014] The advantages and beneficial effects of the present invention are:

[0015] 1. When this low-voltage metering box insert bolt tensile test device is working, the clamping jaws clamp the bolt to be tested, and then the external power mechanism drives this tensile test gripper to gradually move backward. The force-measuring sensor measures the tension of the tension spring. When the required load of the bolt is reached, the tensile test gripper stops moving. If the tested bolt is not loose or damaged, remains in the original position, and there are no cracks in the material around the embedding hole, it is considered to have passed the test. The present invention grabs the object to be tested through the clamping jaws, which is firm and stable, not easy to slip off, and improves the stability and efficiency of the test.

[0016] 2. With the setting of the positioning mechanism in this low-voltage metering box insert bolt tensile test device, the cross laser head can be used to position the tested part, and then the clamping jaws grab it to ensure the accuracy of the grab.

[0017] 3. With the setting of the floating positioning mechanism in this low-voltage metering box insert bolt tensile test device, the position of the air gripper can be adjusted automatically through the compression spring to ensure the stability of the grab.

[0018] 4. The structure of the present invention is designed scientifically and reasonably, with the advantages of convenient operation, improved test efficiency, ensuring stability during testing, and being easy to implement. It is a low-voltage metering box insert bolt tensile test device with high innovation. Description of the Drawings

[0019] Figure 1 is the three-dimensional view of the present invention;

[0020] Figure 2 is the exploded view of the structure of the present invention;

[0021] Figure 3 is the structural schematic diagram of the present invention;

[0022] Figure 4 is Figure 3 the top view of

[0023] Description of the Reference Numerals in the Drawings

[0024] 1 - clamping jaw, 2 - air gripper, 3 - cross laser head, 4 - thimble holder, 5 - force-measuring joint, 6 - spring connecting piece, 7 - tension spring, 8 - vertical surface of the L-shaped plate body, 9 - reinforcing plate, 10 - horizontal surface of the L-shaped plate body, 11 - sliding block, 12 - sliding plate, 13 - air gripper connecting plate, 14 - adjusting and fixing block, 15 - cover plate, 16 - cylinder, 17 - cylinder connecting plate, 18 - compression spring, 19 - oil-free linear slider, 20 - force-measuring sensor, 21 - fixed block. Detailed Embodiments

[0025] The present invention will be further described in detail below through specific embodiments. The following embodiments are only descriptive and not restrictive, and the protection scope of the present invention cannot be limited thereby.

[0026] A low-voltage metering box insert bolt tensile test device, the innovation of which lies in: including a support plate, a sliding mechanism, a clamping mechanism and a force measuring mechanism. The force measuring mechanism is installed on the support plate through the sliding mechanism, and the clamping mechanism is arranged in front of the force measuring mechanism; the support plate is a horizontally arranged plate body with an L-shaped cross section. The sliding mechanism is composed of a sliding plate 12, a gripper connecting plate 13, a sliding stop block 11 and a fixed stop block 21. The sliding plate is slidably installed on the horizontal plane 10 of the L-shaped plate body. Sliding baffles are symmetrically installed on both sides of the front end of the sliding plate. A gripper connecting plate perpendicular to it is jointly installed in the front part of the two sliding baffles. A fixed stop block for limiting the sliding baffle is installed on the horizontal plane of the support plate at the rear end of the sliding plate; the clamping mechanism is composed of a gripper 2 and jaws 1 installed on both sides of the gripper. The gripper controls the opening and closing of the jaws; the force measuring mechanism is mainly composed of a tension spring 7 and a force sensor 20. A force sensor is installed on the inner side surface of the gripper connecting plate. The force sensor is connected to a spring connecting piece 6 through a force measuring joint 5. A tension spring is connected to the spring connecting piece, and the other end of the tension spring is connected to the vertical surface 8 of the L-shaped plate body through a spring connecting piece.

[0027] A reinforcing plate 9 is also installed on the support plate, and the reinforcing plate is arranged at the included angle on both sides of the L-shaped plate body.

[0028] The jaw is composed of two L-shaped jaw bodies. The vertical part of the L-shaped jaw body is connected to the gripper, and a slope structure is cut on the upper end surface of the horizontal part of the L-shaped jaw body. The slope structure is a structure with a higher outer side and a lower inner side.

[0029] It also includes a positioning mechanism, which is composed of a thimble holder 4 and a cross laser head 3. A thimble holder is installed in the middle of the gripper, and a cross laser head is installed at the center position of the front end of the thimble holder. The cross laser head plays a role in accurately positioning the test piece.

[0030] It also includes a floating positioning mechanism, which is composed of an adjusting fixed block 14, an oil-free linear slider 19, a cylinder connecting plate 17, a compression spring 18 and a cover plate 15. An adjusting fixed block is installed at the front part of the gripper connecting plate. An installation groove is provided on the front end surface of the adjusting fixed block, and an oil-free linear slider is embedded in the installation groove. A cylinder connecting plate is installed in the adjusting fixed block on the oil-free linear slider. The periphery of the cylinder connecting plate is limited on the four inner walls of the adjusting fixed block by compression springs. A cover plate connected to the adjusting fixed block is installed at the front end of the cylinder connecting plate. A through hole for the upper cylinder 16 of the gripper is provided in the middle of the cover plate. The bottom of the cylinder is connected to the end surface of the cylinder connecting plate. The compression spring is embedded in the cylinder connecting plate to limit and finely adjust the position of the jaw. The oil-free linear slide plate is to prevent the cylinder connecting plate from being worn due to frequent friction.

[0031] During operation, the position of the test bolt is located by a cross laser head, the floating positioning mechanism fine-tunes the deviation, the air claw drives the clamping jaw to grasp the embedded bolt in the metering box, and corresponding axial loads are given according to different thread hole diameters of the inserts.

[0032] Then, the external power mechanism drives the tensile test gripper to gradually move backward, and the force sensor tests the tensile force of the tensile spring. When the required load for the embedded bolt is reached, the tensile test gripper stops moving. If the test bolt is not loose or damaged, remains in its original position, and there are no cracks in the surrounding material of the embedded hole, it is considered that the test has passed. The present invention grasps the object to be tested by the clamping jaw, which is firm and stable, not easy to slip off, and improves the stability and efficiency of the test.

[0033] In specific implementation, the external power mechanism can be a motor or a cylinder directly acting on the support plate.

[0034] When the external power mechanism is a motor, the support plate can be installed on the side of a vertical bracket, a sliding support plate is installed at the top of the vertical bracket, and a slide rail is provided at the bottom of the sliding support plate. The sliding support plate is driven by the motor to move back and forth on the slide rail, so as to realize the back-and-forth movement of the tensile test gripper.

[0035] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art can understand that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the content disclosed in the embodiments and drawings.

Claims

1. A low-voltage metering box insert bolt tensile test device, characterized in that: It includes a support plate, a sliding mechanism, a clamping mechanism and a force measuring mechanism. The force measuring mechanism is installed on the support plate through the sliding mechanism, and the clamping mechanism is arranged in front of the force measuring mechanism; the support plate is a horizontally arranged plate body with an L-shaped cross-section. The sliding mechanism consists of a sliding plate, a gripper connecting plate, a sliding stop block and a fixed stop block. The sliding plate is slidably installed on the horizontal plane of the L-shaped plate body. Sliding stop blocks are symmetrically installed on both sides of the front end of the sliding plate. A gripper connecting plate perpendicular to them is jointly installed at the front of the two sliding stop blocks. A fixed stop block for limiting the sliding of the sliding stop block is installed on the horizontal plane of the support plate at the rear end of the sliding plate; the clamping mechanism consists of a gripper and jaws installed on both sides of the gripper; the force measuring mechanism is mainly composed of a tension spring and a force measuring sensor. A force measuring sensor is installed on the inner side surface of the gripper connecting plate. The force measuring sensor is connected to a spring connecting piece through a force measuring joint. A tension spring is connected to the spring connecting piece, and the other end of the tension spring is connected to the vertical surface of the L-shaped plate body through a spring connecting piece. The jaws are composed of two L-shaped jaw bodies. The vertical part of the L-shaped jaw body is connected to the gripper. The upper end surface of the horizontal part of the L-shaped jaw body is cut with a slope structure, and the slope structure is a structure with a higher outer side and a lower inner side. It also includes a positioning mechanism, which consists of a thimble holder and a cross laser head. A thimble holder is installed in the middle of the gripper, and a cross laser head is installed at the center position of the front end of the thimble holder. It also includes a floating positioning mechanism, which consists of an adjusting fixed block, an oil-free linear slider, a cylinder connecting plate, a compression spring and a cover plate. An adjusting fixed block is installed at the front of the gripper connecting plate. An installation groove is provided on the front end surface of the adjusting fixed block. An oil-free linear slider is embedded in the installation groove. A cylinder connecting plate is installed in the adjusting fixed block on the oil-free linear slider. The periphery of the cylinder connecting plate is limited on the four inner walls of the adjusting fixed block by compression springs. A cover plate connected to the adjusting fixed block is installed at the front end of the cylinder connecting plate. A through hole for the upper cylinder of the gripper is provided in the middle of the cover plate, and the bottom of the cylinder is connected to the end surface of the cylinder connecting plate.

2. The low-voltage metering box insert bolt tensile force testing device according to claim 1, characterized in that: A reinforcing plate is also installed on the support plate, and the reinforcing plate is arranged at the included angle on both sides of the L-shaped plate body.

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