A static load capacity testing machine for low-voltage metering boxes

Abstract

The present invention relates to a static load capacity testing machine for a low-voltage metering box, characterized in that it is composed of a testing frame, an X-axis transmission mechanism, a Y-axis transmission mechanism, a metering box door limit state testing mechanism and an insert bolt testing mechanism. At the left and right ends of the top of the testing frame, X-axis transmission mechanisms are horizontally arranged. On the two X-axis transmission mechanisms, a Y-axis transmission mechanism arranged front and back is driven and installed. Both Y-axis transmission mechanisms move back and forth on the X-axis transmission mechanism through Y-axis driving mechanisms. A metering box door limit state testing mechanism is installed on the front Y-axis transmission mechanism, and an insert bolt testing mechanism is installed on the rear Y-axis transmission mechanism. The present invention has the advantages of convenient operation, improved testing efficiency, reduced labor intensity, stable testing quality, beneficial to the standardized management of products and easy to implement.

Description

Technical Field

[0001] The invention belongs to the technical field of low-voltage metering box verification, and particularly relates to a static load capacity testing machine for low-voltage metering boxes. 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. In harsh natural environments, metering equipment often fails. As the protective shell of smart electricity meters, acquisition terminals, disconnectors, 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 technical specifications of low-voltage metering boxes of the State Grid Corporation, it is necessary to unify the technical requirements and test methods of the company's low-voltage metering boxes to improve the unified management of metering boxes. However, there is currently no automated verification device for verifying low-voltage metering box products on the market. The traditional method is manual testing and subjective judgment, which has a large labor intensity, low work efficiency, and uneven test results, and cannot guarantee the quality and standardized management of metering boxes.

[0004] Therefore, it is necessary to design a static load testing device for low-voltage metering boxes that can overcome the above disadvantages, which can not only ensure metering quality but also improve the work efficiency of mutual inductor verification. Summary of the Invention

[0005] The purpose of the invention is to solve the problem that existing metering boxes cannot be automatically verified, and to provide a static load capacity testing machine for low-voltage metering boxes that is convenient to operate, improves testing efficiency, reduces labor intensity, has stable testing quality, is conducive to the standardized management of products, and is easy to implement. The device can automatically complete the testing of hinge-type metering box doors and non-metallic threaded inserts of low-voltage metering boxes.

[0006] The invention solves its technical problems through the following technical solutions:

[0007] A static load capacity testing machine for low-voltage metering boxes, characterized in that: it is composed of a testing frame, an X-axis transmission mechanism, a Y-axis transmission mechanism, a metering box door limit state testing mechanism, and an insert bolt testing mechanism. At both left and right ends of the top of the testing frame, an X-axis transmission mechanism is horizontally arranged. On the two X-axis transmission mechanisms, a Y-axis transmission mechanism arranged front and back is driven and installed. Both Y-axis transmission mechanisms move back and forth on the X-axis transmission mechanism through a Y-axis driving mechanism. A metering box door limit state testing mechanism is installed on the front Y-axis transmission mechanism, and an insert bolt testing mechanism is installed on the rear Y-axis transmission mechanism.

[0008] Moreover, the X-axis drive mechanism is composed of an X-axis mounting plate, X-axis linear guide rails, guide rail mounting strips and an X-axis rack. The X-axis mounting plate is mounted on the top of the test frame. X-axis linear guide rails are mounted on the left and right sides of the X-axis mounting plate through the guide rail mounting strips. An X-axis rack parallel to the X-axis linear guide rails is mounted on the inner side of the test frame of the X-axis mounting plate.

[0009] Moreover, the Y-axis drive mechanism is composed of a Y-axis profile frame, Y-axis linear guide rails, guide rail mounting strips and a Y-axis rack. Y-axis linear guide rails are mounted on both long sides of the Y-axis profile frame through the guide rail mounting strips. A Y-axis rack with the tooth surface facing backward is mounted on the rear end face of the Y-axis profile frame.

[0010] Moreover, the Y-axis drive mechanism is composed of a mounting seat, a drive rod, Y-axis drive gears and a Y-axis drive motor. Mounting seats are mounted on the left and right sides at the front end of the Y-axis profile frame. The drive rod is inserted through the mounting seats. Y-axis drive gears meshing with the X-axis rack are mounted at both ends of the drive rod. The drive rod is driven by the Y-axis drive motor.

[0011] Moreover, the metering box door limit state test mechanism is composed of a box door test mounting plate, an X-axis drive unit, an X-axis signal baffle, a travel switch, a proximity switch and a box door test unit. Two box door test mounting plates arranged left and right are mounted on the Y-axis profile frame through the X-axis drive unit. A box door test unit is mounted at the lower part of each box door test mounting plate. The travel switch and the proximity switch are mounted on the front end face of the Y-axis profile frame. An X-axis signal baffle for sensing the travel switch and the proximity switch is mounted on the box door test mounting plate.

[0012] Moreover, the X-axis drive unit is composed of an X-axis drive motor and an X-axis gear. The X-axis gear meshes with the Y-axis rack. The X-axis gear is driven by the X-axis drive motor. The X-axis drive motor is mounted on the box door test mounting plate.

[0013] Moreover, the box door test unit includes a Z-direction profile bracket, a metering box pressing component and an opening test rotating component. A Z-direction profile bracket is arranged at the bottom of the box door test mounting plate. A metering box pressing component is arranged on the inner side surface of the Z-direction profile bracket. An opening test rotating component is arranged on the rear end face of the Z-direction profile bracket.

[0014] Moreover, a reinforcing welding piece is arranged at the included angle between the box door test mounting plate and the Z-direction profile bracket.

[0015] Moreover, the metering box pressing assembly consists of an orbital plate, a first Z-axis lead screw, a first Z-axis driving motor, and a pressing module. An orbital plate is installed on the Z-direction profile bracket, and a pressing module is slidably installed on the orbital plate. The pressing module is threadedly connected to the first Z-axis lead screw provided on the orbital plate, and the first Z-axis lead screw is driven by the first Z-axis driving motor. The pressing module consists of a connecting part and a pressing part. The connecting part is threadedly connected to the first Z-axis lead screw, and a pressing part extending forward is installed at the side end of the connecting part.

[0016] Moreover, the door-opening test rotating assembly includes an orbital plate, a mounting bracket, and a test rotating module. An orbital plate is installed on the front end face of the Z-direction profile bracket. A second Z-axis lead screw is provided on the orbital plate. A mounting bracket is threadedly installed on the second Z-axis lead screw, and a test rotating module is rotatably installed on the mounting bracket. The second Z-axis lead screw is driven by a second Z-axis driving motor at its upper part, and the second Z-axis driving motor is provided at the upper part of the box door test mounting plate.

[0017] Moreover, the test rotating module includes a rotating motor, a speed reducer, a rotating plate, a slideway, a sliding seat, a cylinder, a crank, a stop block, a spring, and a torque sensor. A rotating motor connected to the speed reducer is installed on the mounting bracket. The rotating motor drives the rotating plate installed at the lower part of the mounting bracket to rotate. A slideway is provided along the width direction at the front end of the inner side of the rotating plate. A sliding seat is slidably installed on the slideway. A cylinder is fixedly installed on the sliding seat. A crank is driven and connected to the lower part of the cylinder rod. A stop block installed on the rotating plate is provided at the rear part on the opposite side of the crank. A fixing bracket is fixedly installed at the rear end of the slideway. One end of the spring is connected to the fixing bracket, the other end of the spring is connected to the torque sensor, and the other end of the torque sensor is connected to the sliding seat.

[0018] Moreover, the test rotating module further includes a Z-axis signal piece and a proximity switch. The Z-axis signal piece is installed on one side of the rear part of the mounting bracket, and proximity switches are longitudinally arranged at intervals on the Z-direction profile bracket on one side of the Z-axis signal piece.

[0019] Moreover, the insert bolt test mechanism consists of an insert test mounting plate, an X-axis driving unit, an X-axis signal piece, a travel switch, a proximity switch, and a tensile test gripper. An insert test mounting plate is installed on the Y-axis profile frame through the X-axis driving unit. A Z-direction profile bracket is installed at the lower part of the insert test mounting plate. A tensile test gripper is slidably installed up and down on the front end face of the Z-direction profile bracket. The tensile test gripper is driven by a gripper driving motor installed on the insert test mounting plate. The travel switch and the proximity switch are installed on the front end face of the Y-axis profile frame. An X-axis signal piece for sensing the travel switch and the proximity switch is installed on the insert test mounting plate.

[0020] Moreover, the tensile test gripper 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 commonly 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 mainly consists of a tension spring and a force measuring sensor. The 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.

[0021] 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.

[0022] Moreover, the jaws are composed of two L-shaped claw bodies. The vertical part of the L-shaped claw body is connected to the gripper, and a slope structure is machined on the upper end surface of the horizontal part of the L-shaped claw body. The slope structure is a structure with a higher outer side and a lower inner side.

[0023] Moreover, a positioning mechanism is also included. The positioning mechanism consists of a thimble holder and a cross laser head. The thimble holder is installed in the middle of the gripper, and the cross laser head is installed at the center position of the front end of the thimble holder.

[0024] Moreover, a floating positioning mechanism is also included. The floating positioning mechanism consists of an adjusting fixed block, an oil-free linear slider, a cylinder connecting plate, a compression spring, and a cover plate. The 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. The oil-free linear slider is embedded in the installation groove. The 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 by the compression spring on the four inner walls of the adjusting fixed block. 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.

[0025] The advantages and beneficial effects of the present invention are:

[0026] This low-voltage metering box static load capacity testing machine can automatically complete the testing of the hinged metering box door of the low-voltage metering box and the testing of non-metallic threaded inserts. Among them, for the testing of the hinged metering box door of the low-voltage metering box: when the metering box door is in the fully open state, the opening test rotating assembly automatically performs the test on the box door and the hinge; for the testing of non-metallic threaded inserts: after installing the corresponding type of screw in the threaded hole to be tested and positioning the insert bolt testing mechanism, it automatically executes. Compared with the existing method of testing the static load capacity of low-voltage metering boxes, it greatly improves the accuracy and efficiency of the testing, and ensures the quality and standardized management of the metering boxes. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of the present invention;

[0028] Figure 2 is a schematic structural diagram of the test frame of the present invention;

[0029] Figure 3 is a schematic structural diagram of the Y-axis driving mechanism of the present invention;

[0030] Figure 4 is a schematic diagram of the usage state of the present invention with the test frame omitted;

[0031] Figure 5 is a schematic structural diagram of the assembly of the Y-axis transmission mechanism and the X-axis transmission mechanism of the present invention; (A metering box door limit state testing mechanism is installed on the Y-axis transmission mechanism)

[0032] Figure 6 is a schematic structural diagram of the assembly of the metering box door limit state testing mechanism on the Y-axis transmission mechanism of the present invention;

[0033] Figure 7 is a schematic structural diagram of the X-axis driving unit of the present invention;

[0034] Figure 8 is a schematic structural diagram of the metering box door limit state testing mechanism of the present invention;

[0035] Figure 9 is Figure 8 a front view from another angle;

[0036] Figure 10 is a schematic structural diagram of the metering box pressing assembly of the present invention;

[0037] Figure 11 is a schematic structural diagram of the test rotating module of the present invention (the rotating motor and the reducer are omitted);

[0038] Figure 12 is Figure 11 a structural diagram from another angle;

[0039] Figure 13Stereogram of the tensile test gripper of the present invention;

[0040] Figure 14 Exploded view of the tensile test gripper of the present invention;

[0041] Figure 15 Front view of the tensile test gripper of the present invention;

[0042] Figure 16 is Figure 15 top view of.

[0043] 1 - X-axis drive mechanism, 2 - test frame, 3 - Y-axis drive mechanism, 4 - Y-axis drive motor, 5 - mounting seat, 6 - drive rod, 7 - Y-axis drive gear, 8 - Y-axis profile frame, 9 - Y-axis linear guide rail, 10 - X-axis rack, 11 - X-axis mounting plate, 12 - X-axis linear guide rail, 13 - drag chain, 14 - metering box, 15 - tensile test gripper, 16 - insert bolt test mechanism, 17 - Y-axis rack, 18 - proximity switch, 19 - X-axis signal baffle, 20 - Y-axis drive mechanism, 21 - travel switch, 22 - door test unit, 23 - X-axis drive motor, 24 - second Z-axis drive motor, 25 - door test mounting plate, 26 - metering box pressing assembly, 27 - door opening test rotating assembly, 28 - X-axis gear, 29 - reinforcement welding part, 30 - Z-direction profile support, 31 - Z-axis signal baffle, 32 - mounting bracket, 33 - stop block, 34 - crank, 35 - cylinder, 36 - sliding seat, 37 - rotating plate, 38 - reducer, 39 - rotating motor, 40 - pressing module, 41 - connecting part, 42 - pressing part, 43 - first Z-axis lead screw, 44 - first Z-axis drive motor, 45 - track plate, 46 - fixing bracket, 47 - spring, 48 - torque sensor, 49 - jaw, 50 - air gripper, 51 - cross laser head, 52 - thimble holder, 53 - force measuring joint, 54 - spring connecting piece, 55 - tension spring, 56 - vertical surface of L-shaped plate body, 57 - reinforcing plate, 58 - horizontal surface of L-shaped plate body, 59 - sliding stop block, 60 - sliding plate, 61 - air gripper connecting plate, 62 - adjusting and fixing block, 63 - cover plate, 64 - cylinder, 65 - cylinder connecting plate, 66 - compression spring, 67 - oil-free linear slider, 68 - force measuring sensor, 69 - fixed stop block. Detailed implementation mode

[0044] 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.

[0045] A static load capacity testing machine for a low-voltage metering box, its innovation lies in: it consists of a testing frame 2, an X-axis transmission mechanism 1, a Y-axis transmission mechanism 3, a metering box door limit state testing mechanism, and an insert bolt testing mechanism 16. At the left and right ends of the top of the testing frame, X-axis transmission mechanisms are horizontally arranged. On the two X-axis transmission mechanisms, a Y-axis transmission mechanism arranged front and back is driven and installed. Both Y-axis transmission mechanisms move back and forth on the X-axis transmission mechanism through a Y-axis driving mechanism 20. A metering box door limit state testing mechanism is installed on the front Y-axis transmission mechanism, and an insert bolt testing mechanism is installed on the rear Y-axis transmission mechanism.

[0046] The X-axis transmission mechanism consists of an X-axis mounting plate 11, an X-axis linear guide 12, a guide rail mounting strip, and an X-axis rack 10. The X-axis mounting plate is installed on the top of the testing frame. On the left and right sides of the X-axis mounting plate, X-axis linear guides are installed through the guide rail mounting strip. On the inner side of the X-axis mounting plate of the testing frame, an X-axis rack parallel to the X-axis linear guide is installed.

[0047] The Y-axis transmission mechanism consists of a Y-axis profile frame 8, a Y-axis linear guide 9, a guide rail mounting strip, and a Y-axis rack 17. On the two long sides of the Y-axis profile frame, Y-axis linear guides are installed through the guide rail mounting strip. On the rear end face of the Y-axis profile frame, a Y-axis rack with the tooth surface facing backward is installed.

[0048] The Y-axis driving mechanism consists of a mounting seat 5, a driving rod 6, a Y-axis driving gear 7, and a Y-axis driving motor 4. On the front left and right sides of the Y-axis profile frame, mounting seats are installed. The driving rod is inserted through the mounting seat. At both ends of the driving rod, Y-axis driving gears meshing with the X-axis rack are installed. The driving rod is driven by the Y-axis driving motor, thereby driving the Y-axis transmission mechanism to move on the X-axis transmission mechanism. On the side of the X-axis mounting plate, a support plate is installed, and a drag chain 13 moving with the Y-axis transmission mechanism is arranged on the support plate.

[0049] The metering box door limit state testing mechanism consists of a box door testing mounting plate 25, an X-axis driving unit, an X-axis signal baffle 19, a travel switch 21, a proximity switch 18, and a box door testing unit 22. On the Y-axis profile frame, two box door testing mounting plates arranged left and right are installed through the X-axis driving unit. At the lower part of each box door testing mounting plate, a box door testing unit is installed. The travel switch and the proximity switch are installed on the front end face of the Y-axis profile frame. On the box door testing mounting plate, an X-axis signal baffle for sensing the travel switch and the proximity switch is installed, which is used to detect the position of the box door testing mounting plate on the Y-axis profile frame.

[0050] The described X-axis drive unit consists of an X-axis drive motor 23 and an X-axis gear 28. The X-axis gear meshes with the Y-axis rack. The X-axis gear is driven by the X-axis drive motor, and the X-axis drive motor is installed on the cabinet door test mounting plate. A support plate is installed on the side of the Y-axis profile frame, and a drag chain that moves with the metering cabinet door limit state test mechanism is provided on the support plate.

[0051] The described cabinet door test unit includes a Z-axis profile support 30, a metering cabinet pressing assembly 26, and a door opening test rotation assembly 27. A Z-axis profile support is provided at the bottom of the cabinet door test mounting plate. A metering cabinet pressing assembly is provided on the inner side surface of the Z-axis profile support, and a door opening test rotation assembly is provided on the rear end surface of the Z-axis profile support.

[0052] A reinforcing weldment 29 is provided at the angle between the cabinet door test mounting plate and the Z-axis profile support. The provision of the reinforcing weldment effectively prevents the shaking problem during the operation of the cabinet door test unit and ensures the stability of the test.

[0053] The described metering cabinet pressing assembly consists of a track plate 45, a first Z-axis lead screw 43, a first Z-axis drive motor 44, and a pressing module 40. A track plate is installed on the Z-axis profile support, and the pressing module is slidably installed on the track plate. The pressing module is threadedly connected to the first Z-axis lead screw provided on the track plate, and the first Z-axis lead screw is driven by the first Z-axis drive motor. The pressing module consists of a connecting portion 41 and a pressing portion 42. The connecting portion is threadedly connected to the first Z-axis lead screw, and a forwardly extending pressing portion is installed at the side end of the connecting portion.

[0054] The described door opening test rotation assembly includes a track plate, a mounting bracket 32, and a test rotation module. A track plate is installed on the front end surface of the Z-axis profile support. A second Z-axis lead screw is provided on the track plate. A mounting bracket is threadedly installed on the second Z-axis lead screw, and a test rotation module is rotatably installed on the mounting bracket. The second Z-axis lead screw is driven by a second Z-axis drive motor 24 at its upper part, and the second Z-axis drive motor is provided at the upper part of the cabinet door test mounting plate.

[0055] The described test rotation module includes a rotation motor 39, a speed reducer 38, a rotation plate 37, a slideway, a slide block 36, a cylinder 35, a crank 34, a stop block 33, a spring 47 and a torque sensor 48. A rotation motor connected to the speed reducer is installed on the mounting frame. The rotation motor drives the rotation plate installed at the lower part of the mounting frame. At the front end of the inner side of the rotation plate, a slideway is arranged along its width direction. A slide block is slidably installed on the slideway. A cylinder is fixedly installed on the slide block. The lower part of the cylinder rod is drivingly connected to the crank. A stop block installed on the rotation plate is arranged at the rear part on the opposite side of the crank. A fixing frame 46 is fixedly installed at the rear end of the slideway. One end of the spring is connected to the fixing frame, the other end of the spring is connected to the torque sensor, and the other end of the torque sensor is connected to the slide block.

[0056] The described test rotation module further includes a Z-axis signal baffle 31 and a proximity switch. The Z-axis signal baffle is installed on one side of the rear part of the mounting frame, and proximity switches are longitudinally arranged at intervals on the Z-direction profile bracket on one side of the Z-axis signal baffle.

[0057] Through the setting of the proximity switch on the test rotation assembly, the position of the mounting frame thereon can be detected to meet the test requirements of metering box doors with different heights.

[0058] The insert bolt test mechanism is composed of an insert test mounting plate, an X-axis drive unit, an X-axis signal baffle, a travel switch, a proximity switch and a tensile test gripper 15. The insert test mounting plate is installed on the Y-axis profile frame through the X-axis drive unit. A Z-direction profile bracket is installed at the lower part of the insert test mounting plate. A tensile test gripper is slidably installed up and down on the front end face of the Z-direction profile bracket. The tensile test gripper is driven by a gripper drive motor installed on the insert test mounting plate. The travel switch and the proximity switch are installed on the front end face of the Y-axis profile frame. An X-axis signal baffle for sensing the travel switch and the proximity switch is installed on the insert test mounting plate.

[0059] The described tensile test gripper 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 60, a gripper connecting plate 61, a sliding stop block 59, and a fixed stop block 69. The sliding plate is slidably installed on the horizontal plane 58 of the L-shaped plate body. Sliding baffles are symmetrically installed on both front ends of the sliding plate. A gripper connecting plate perpendicular to them is jointly installed at the front 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 consists of a gripper 50 and clamping jaws 49 installed on both sides of the gripper; the force measuring mechanism mainly consists of a tensile spring 55 and a force measuring sensor 68. The 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 member 54 through a force measuring joint 53. A tensile spring is connected to the spring connecting member. The other end of the tensile spring is connected to the vertical surface 56 of the L-shaped plate body through a spring connecting member.

[0060] A reinforcing plate 57 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.

[0061] The clamping jaw consists 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.

[0062] It also includes a positioning mechanism, which consists of a thimble holder 52 and a cross laser head 51. The thimble holder is installed in the middle of the gripper, and the cross laser head is installed at the center position of the front end of the thimble holder. Through the setting of the positioning mechanism, the cross laser head can be used to position the measured part, and then the clamping jaws can grab it to ensure the accuracy of grabbing. The cross laser head plays a role in accurately positioning the test piece.

[0063] It also includes a floating positioning mechanism, which is composed of an adjusting fixed block 62, an oil-free linear slider 67, a cylinder connecting plate 65, a compression spring 66 and a cover plate 63. An adjusting fixed block is installed at the front part of the air gripper connecting plate. An installation groove is provided on the front end face 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 air gripper is provided in the middle of the cover plate. The bottom of the cylinder 64 is connected to the end face of the cylinder connecting plate. Through the setting of the floating positioning mechanism, the position of the air gripper can be finely adjusted by the compression spring itself to ensure the stability of grasping. The compression spring is embedded in the cylinder connecting plate to limit and finely adjust the position of the clamping jaw. The oil-free linear sliding plate is to prevent the cylinder connecting plate from being worn due to frequent friction.

[0064] Working process:

[0065] (1) When a metering box 14 is transported to the test station, the Y-axis driving mechanism drives the metering box door limit state testing mechanism to move along the X-axis transmission mechanism to the test position; the metering box door limit state testing mechanisms on both sides move to the test positions respectively. According to the sizes of different metering boxes, the metering box door limit state testing mechanism can choose to move one or two simultaneously in opposite directions. Since the heights of the metering box doors of different models are inconsistent, the second Z-axis driving motor drives the test rotating assembly to adjust to the appropriate position according to the signal feedback.

[0066] (2) In the metering box door limit state testing mechanism, the metering box pressing assembly presses the metering box. Manually open the box door and limit the upper end of the box door between the stop block and the crank. Then the rotating motor drives the rotating plate to rotate, rotates the metering box door to the limit position (usually 180°), and applies a load of 50 N at a distance of 300 mm from the hinge edge on the upper edge of the box door for 3 s. If the hinge of the door does not fall off and the functions of the door, hinge and locking device are not damaged, the test is considered to pass.

[0067] (3) After the metering box door test is completed, the insert bolt testing mechanism moves along the X-axis transmission mechanism to the specified position. The tensile test gripper moves to the metering box insert bolt test position. The position of the test bolt is located by the cross laser head. The floating positioning mechanism finely adjusts the deviation. The air gripper drives the clamping jaw to grasp the metering box embedded bolt, and gives the corresponding axial load according to different insert thread hole diameters. Then the external power mechanism drives the tensile test gripper to move backward gradually. The force measuring sensor tests the tension of the tension spring. When the required load of the bolt is reached, the tensile test gripper stops moving. If the test bolt is not loose or damaged, is still in the original position, and there are no cracks in the surrounding material of the embedding hole, the test is considered to pass.

[0068] Although embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will 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 static load capacity testing machine for low-voltage metering boxes, characterized in that: It is composed of a test frame, an X-axis transmission mechanism, a Y-axis transmission mechanism, a metering box door limit state test mechanism, and an insert bolt test mechanism. At both left and right ends of the top of the test frame, the X-axis transmission mechanisms are horizontally arranged. On the two X-axis transmission mechanisms, a Y-axis transmission mechanism arranged front and back is driven and installed. Both Y-axis transmission mechanisms move back and forth on the X-axis transmission mechanism through a Y-axis drive mechanism. A metering box door limit state test mechanism is installed on the front Y-axis transmission mechanism, and an insert bolt test mechanism is installed on the rear Y-axis transmission mechanism; The X-axis transmission mechanism is composed of an X-axis mounting plate, X-axis linear guides, guide rail mounting strips, and an X-axis rack. The X-axis mounting plate is installed on the top of the test frame. On the left and right sides of the X-axis mounting plate, X-axis linear guides are installed through the guide rail mounting strips. On the inner side of the X-axis mounting plate, an X-axis rack parallel to the X-axis linear guides is installed on the test frame; The Y-axis transmission mechanism is composed of a Y-axis profile frame, Y-axis linear guides, guide rail mounting strips, and a Y-axis rack. On both long sides of the Y-axis profile frame, Y-axis linear guides are installed through the guide rail mounting strips. On the rear end face of the Y-axis profile frame, a Y-axis rack with the tooth surface facing backward is installed; The Y-axis drive mechanism is composed of a mounting seat, a drive rod, a Y-axis drive gear, and a Y-axis drive motor. On both left and right sides of the front end of the Y-axis profile frame, mounting seats are installed. The drive rod is inserted through the mounting seats. At both ends of the drive rod, Y-axis drive gears meshing with the X-axis rack are installed. The drive rod is driven by a Y-axis drive motor; The metering box door limit state test mechanism is composed of a box door test mounting plate, an X-axis drive unit, an X-axis signal baffle, a travel switch, a proximity switch, and a box door test unit. On the Y-axis profile frame, two box door test mounting plates arranged left and right are installed through the X-axis drive unit. At the lower part of each box door test mounting plate, a box door test unit is installed. The travel switch and the proximity switch are installed on the front end face of the Y-axis profile frame. On the box door test mounting plate, an X-axis signal baffle for sensing the travel switch and the proximity switch is installed. The X-axis drive unit is composed of an X-axis drive motor and an X-axis gear. The X-axis gear meshes with the Y-axis rack. The X-axis gear is driven by the X-axis drive motor, and the X-axis drive motor is installed on the box door test mounting plate; The box door test unit includes a Z-direction profile bracket, a metering box pressing assembly, and a door opening test rotating assembly. At the bottom of the box door test mounting plate, a Z-direction profile bracket is provided. On the inner side surface of the Z-direction profile bracket, a metering box pressing assembly is provided. On the rear end face of the Z-direction profile bracket, a door opening test rotating assembly is provided; The door opening test rotating assembly includes an orbital plate, a mounting frame, and a test rotating module. On the front end face of the Z-direction profile bracket, an orbital plate is installed. On the orbital plate, a second Z-axis lead screw is provided. On the second Z-axis lead screw, a mounting frame is threadedly installed. On the mounting frame, a test rotating module is rotatably installed. The second Z-axis lead screw is driven by a second Z-axis drive motor at its upper part, and the second Z-axis drive motor is arranged at the upper part of the box door test mounting plate; The described test rotation module includes a rotation motor, a speed reducer, a rotating plate, a slideway, a slide block, a cylinder, a crank, a stop block, a spring and a torque sensor. A rotation motor connected to the speed reducer is installed on the mounting frame. The rotation motor drives the rotating plate installed at the lower part of the mounting frame to rotate. A slideway arranged along its width direction is provided at the front end of the inner side of the rotating plate. A slide block is slidably installed on the slideway. A cylinder is fixedly installed on the slide block. A crank is drivingly connected to the lower part of the cylinder rod. A stop block installed on the rotating plate is arranged at the rear part on the opposite side of the crank. A fixing frame is fixedly installed at the rear end of the slideway. One end of the spring is connected to the fixing frame, the other end of the spring is connected to the torque sensor, and the other end of the torque sensor is connected to the slide block; The described metering box pressing assembly consists of a track plate, a first Z-axis lead screw, a first Z-axis driving motor and a pressing module. A track plate is installed on the Z-direction profile bracket. A pressing module is slidably installed on the track plate. The pressing module is threadedly connected to the first Z-axis lead screw arranged on the track plate. The first Z-axis lead screw is driven by the first Z-axis driving motor; The pressing module consists of a connecting part and a pressing part. The connecting part is threadedly connected to the first Z-axis lead screw, and a pressing part extending forward is installed at the side end of the connecting part.

2. The static load capacity testing machine for a low-voltage metering box according to claim 1, characterized in that: The described test rotation module further includes a Z-axis signal baffle and a proximity switch. The Z-axis signal baffle is installed on one side of the rear part of the mounting frame. Proximity switches are longitudinally arranged at intervals on the Z-direction profile bracket on one side of the Z-axis signal baffle.

3. A static load capacity testing machine for a low-voltage metering box according to claim 1, characterized in that: The described insert bolt test mechanism consists of an insert test mounting plate, an X-axis driving unit, an X-axis signal baffle, a travel switch, a proximity switch and a tensile test gripper. An insert test mounting plate is installed on the Y-axis profile frame through the X-axis driving unit. A Z-direction profile bracket is installed at the lower part of the insert test mounting plate. A tensile test gripper is slidably installed up and down on the front end face of the Z-direction profile bracket. The tensile test gripper is driven by a gripper driving motor installed on the insert test mounting plate. The travel switch and the proximity switch are installed on the front end face of the Y-axis profile frame. An X-axis signal baffle for sensing the travel switch and the proximity switch is installed on the insert test mounting plate.

4. A static load capacity testing machine for a low-voltage metering box according to claim 3, characterized in that: The described tensile test gripper includes a support plate, a sliding mechanism, a clamping mechanism and a force measuring mechanism. A force measuring mechanism is installed on the support plate through the sliding mechanism, and a 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 baffle plates 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 baffle plates. A fixed stop block for limiting the sliding baffle plate 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 mainly consists of a tensile 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 tensile spring is connected to the spring connecting piece. The other end of the tensile 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 claw bodies. The vertical part of the L-shaped claw body is connected to the gripper. A slope structure is machined on the upper end surface of the horizontal part of the L-shaped claw body. The slope structure is a structure with a higher outer side and a lower inner side.

5. The static load capacity testing machine for a low-voltage metering box according to claim 4, characterized in that: It further 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 further 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 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. The bottom of the cylinder is connected to the end surface of the cylinder connecting plate.

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