Weld grinding equipment

Abstract

The present invention relates to the technical field of grinding devices, and specifically discloses a weld grinding device, including a workbench, a turntable, a fixing mechanism, a driving mechanism, and a belt grinding mechanism. The fixing mechanism includes two fixing plates symmetrically arranged and assembled on the turntable for forward and backward movement, a calibrator located between each belt grinding mechanism and the center of the turntable and rotatably mounted on the turntable, a positioning needle mounted on each calibrator and retractable relative to the calibrator, two hydraulic tanks located between each fixing plate and the center of the turntable and fixed on the turntable, and a piston installed in each hydraulic tank and elastically connected to the fixing plate; each hydraulic tank is connected to the calibrator, and the tip of the positioning needle is used to push the inner wall of the box body; each belt grinding mechanism is movably assembled on the workbench, and the belt grinding mechanism includes a positioning fixture for clamping the calibrator so that the belt grinding mechanism moves to face the calibrator. The weld grinding device realizes automatic adjustment of the position of the belt grinding mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of grinding devices, and in particular to weld grinding equipment. Background Art

[0002] New energy battery box is a key component of new energy vehicles, mainly used to carry, fix, protect and integrate battery packs. The main materials of new energy battery box include steel, aluminum alloy and composite materials. After the battery box is welded, the weld needs to be polished to remove the oxide layer, welding slag and other uneven parts on the weld surface, making the appearance of the battery box smoother and more beautiful.

[0003] A Chinese patent application document with publication number CN113664671A discloses a box weld grinding device, which places a box on the top of a turntable, then fixes the box through a fixing mechanism, drives two sets of sliding brackets to move toward each other through driving cylinders on both sides, and grinds the welds on the four sides of the box through a belt grinding mechanism on the sliding bracket. During the grinding process, the turntable and the box are driven to reciprocate left and right by the driving mechanism, so that the belt grinding mechanism can fully grind the welds on the four sides of the box without manual grinding. Compared with robot grinding, it saves costs, improves work efficiency, and improves practicality.

[0004] However, when the box weld grinding device in the prior art is used to grind boxes of different sizes, it is necessary to adjust the position of the belt grinding mechanism forward and backward by rotating the adjusting screw to adapt to boxes of different sizes. Due to the influence of human factors, the manual adjustment has poor accuracy and limited adaptability, making it difficult to ensure that the box weld is facing the grinding belt, which can easily lead to inconsistent grinding effects and affect product quality. Summary of the invention

[0005] The present invention provides a weld grinding device, aiming to solve the problems of poor position accuracy and limited adaptability of a manually adjusted belt grinding mechanism in a box weld grinding device in the related art.

[0006] The present invention provides a weld grinding device that adopts the following technical solution:

[0007] A weld grinding device comprises a workbench, a turntable rotatably mounted on the workbench, a fixing mechanism arranged on the turntable, a driving mechanism arranged at the bottom of the workbench, and four groups of belt grinding mechanisms arranged on the workbench, wherein the fixing mechanism comprises two fixing plates symmetrically arranged and assembled on the turntable for forward and backward movement, a calibrator located between each belt grinding mechanism and the center of the turntable and rotatably mounted on the turntable, a positioning needle mounted on each calibrator and retractable relative to the calibrator, two hydraulic tanks located between each fixing plate and the center of the turntable and fixed on the turntable, and a piston 1 installed in each hydraulic tank and elastically connected to the fixing plate; each hydraulic tank is connected to the calibrator, and the piston 1 is used to adjust the hydraulic oil pressure flowing from the hydraulic tank to the calibrator to drive the positioning needle to retract, and the tip of the positioning needle is used to push the inner wall of the box body, so that when the positioning needle is extended, it can drive the calibrator to rotate to align with the projection of the diagonal line of the box body in the horizontal plane under the restriction of the inner wall of the box body; each belt grinding mechanism is movably assembled on the workbench, and the belt grinding mechanism comprises a positioning fixture for clamping the calibrator to move the belt grinding mechanism to face the calibrator.

[0008] By adopting the above technical scheme, before grinding the box body, the box body is clamped by two fixing plates approaching each other to fix the box body on the turntable, and the two fixing plates are moved when they approach each other to drive the piston to move, driving the positioning pin to extend, so that the positioning pin drives the calibrator to rotate to align with the projection of the diagonal of the box body in the horizontal plane under the restriction of the inner wall of the box body, thereby positioning the projection of the diagonal of the box body in the horizontal plane; the positioned calibrator provides a reference line, so that when the alignment fixture clamps the calibrator, it can be used as a reference for position calibration, driving the belt grinding mechanism to move to face the calibrator, that is, facing the weld of the box body, thereby realizing automatic adjustment of the position of the belt grinding mechanism, which can more accurately control the grinding position and force to ensure that the weld is polished more evenly and smoothly, and can also automatically adapt to battery box bodies of different sizes, with strong adaptability, ensuring the consistency of the grinding effect and improving product quality.

[0009] Furthermore, four rotating shafts are fixed on the turntable, which are respectively located at the left front, right front, left rear and right rear of the center of the turntable. Each of the calibrators includes an oil tank rotatably mounted outside the rotating shaft. The oil tank includes a cylindrical portion coaxially arranged with the rotating shaft and a square rod portion fixedly connected to the cylindrical portion. A reset torsion spring is arranged between the cylindrical portion and the rotating shaft, and the cylindrical portion is connected to the hydraulic tank through a first oil pipe.

[0010] Furthermore, the calibrator also includes a clamping rod fixedly sleeved on the outer end of the square rod portion, and the clamping rod extends from the bottom of the box body to the outside of the box body.

[0011] Furthermore, the positioning needle includes a needle body and a needle head, the needle body is in the shape of a round rod, the cross section of the needle head is triangular and extends up and down, and the tip of the needle head has an arc-shaped chamfer.

[0012] Using the above technical solution, the cross-section of the needle is triangular and extends up and down, which is suitable for positioning at the corners of the box. It can touch two adjacent edges at the same time, helping to ensure the accuracy of diagonal positioning; the tip of the needle has an arc-shaped guide angle, which can avoid damaging the inner wall of the box, and can move along the inner wall of the box when it touches the inner wall of the box, helping the positioning needle to move to the diagonal position.

[0013] Furthermore, the fixing mechanism also includes a fixed screw extending forward and backward and rotatably installed on the turntable, and two movable plates symmetrically arranged and assembled on the turntable for forward and backward movement, each of the movable plates is located between the fixed plate and piston one, and is connected to piston one through a spring, the fixed screw has a forward thread segment and a reverse thread segment, the movable plate and the fixed plate located in front of the center of the turntable are respectively provided with forward thread holes, and are threadedly connected to the forward thread segment of the fixed screw, and the movable plate and the fixed plate located behind the center of the turntable are respectively provided with reverse thread holes, and are threadedly connected to the reverse thread segment of the fixed screw.

[0014] Furthermore, the workbench is provided with adjustment grooves corresponding to each belt grinding mechanism and extending along the diagonal direction of the workbench, and each of the belt grinding mechanisms also includes an adjustment screw rotatably installed in the adjustment groove, a movable seat movably assembled in the adjustment groove, a sliding seat movably assembled on the movable seat along the width direction of the adjustment groove, and a rotating seat rotatably installed on the sliding seat, the movable seat is provided with a threaded hole threadedly connected to the adjustment screw, and the alignment fixture is installed on the rotating seat.

[0015] By adopting the above technical scheme, the adjusting screw is rotated by manual or electric control, and the adjusting screw drives the moving seat to drive the belt grinding mechanism to move along the adjusting groove, so that when the size of the box to be polished changes greatly, the position of the belt grinding mechanism on the workbench can be roughly adjusted, thereby expanding the applicable range of the equipment to the box size; the setting of the sliding seat and the rotating seat enables the belt grinding mechanism to rotate freely in the horizontal plane and slide freely along the width direction of the adjusting groove, that is, the belt grinding mechanism can move freely within a certain range to realize the position calibration of the belt grinding mechanism.

[0016] Furthermore, the alignment clamp includes a clamp screw whose length extends along the width direction of the rotating seat and is rotatably installed on the rotating seat, a clamp motor installed on the rotating seat to drive the clamp screw to rotate, two moving blocks symmetrically arranged and assembled on the rotating seat for movement along the width direction of the rotating seat, two clamping plates symmetrically arranged and assembled on the rotating seat for movement along the width direction of the rotating seat, and an elastic rod connected between the moving blocks and the clamping plates, the clamp screw having a forward threaded section and a reverse threaded section, one of the moving blocks having a forward threaded hole and being threadedly connected to the forward threaded section of the clamp screw, and the other moving block having a reverse threaded hole and being threadedly connected to the reverse threaded section of the clamp screw.

[0017] Furthermore, the belt grinding mechanism also includes two guide rollers rotatably mounted on a rotating seat, a movable platform mounted on the rotating seat and movable along the length direction of the rotating seat, an active roller rotatably mounted on the movable platform, a grinding belt wound around the guide rollers and the active roller in a closed loop, a grinding motor arranged at the bottom end of the rotating seat to drive the active roller to rotate, and a compensator arranged on the rotating seat.

[0018] Furthermore, when the driving mechanism drives the turntable to drive the box to rotate reciprocatingly, the box has a first rotation direction that is the same as the rotation direction of the grinding belt and a second rotation direction that is opposite to the rotation direction of the grinding belt. The compensator includes a telescopic oil tank installed between a clamp facing the first rotation direction and a rotating seat, a balancing oil tank fixed on the rotating seat, a second piston installed in the balancing oil tank and fixedly connected to the movable platform, and a second oil pipe connected between the telescopic oil tank and the balancing oil tank.

[0019] By adopting the above technical solution, the compensator is used to increase the tension of the grinding belt when the box rotates along the first rotation direction, so as to increase the friction of the grinding belt on the box at this time, so that the friction force exerted on the box during the reciprocating rotation is uniform and consistent, thereby ensuring the consistency of the grinding effect.

[0020] Furthermore, the belt grinding mechanism also includes a positioning roller rotatably mounted on the rotating seat and located between the two guide rollers.

[0021] By adopting the above technical solution, the positioning roller can support the grinding belt when the grinding belt is recessed inwardly, so as to increase the force of the grinding belt on the welding seam of the box body.

[0022] The beneficial effects of a weld grinding device provided by the present invention are as follows: before grinding the box body, the box body is clamped close to each other by two fixing plates so as to fix the box body on the turntable, and the two fixing plates are moved close to each other to drive the piston to move, driving the positioning pin to extend, so that the positioning pin drives the calibrator to rotate to align with the projection of the diagonal line of the box body in the horizontal plane under the restriction of the inner wall of the box body, thereby positioning the projection of the diagonal line of the box body in the horizontal plane; the positioned calibrator provides a reference line, so that when the alignment fixture clamps the calibrator, it can be used as a reference for position calibration, driving the belt grinding mechanism to move to face the calibrator, that is, facing the weld of the box body, thereby realizing automatic adjustment of the position of the belt grinding mechanism, and can more accurately control the grinding position and force to ensure that the weld is polished more evenly and smoothly, and can also automatically adapt to battery box bodies of different sizes, with strong adaptability, ensuring the consistency of the grinding effect and improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the weld grinding equipment of the present invention.

[0024] Figure 2 It is a structural schematic diagram of the fixing mechanism of the weld grinding equipment of the present invention.

[0025] Figure 3 The present invention is a schematic structural diagram of a calibrator, a positioning pin and an alignment fixture of the weld grinding equipment.

[0026] Figure 4 It is a first structural schematic diagram of the belt grinding mechanism of the weld grinding equipment of the present invention.

[0027] Figure 5 It is a second structural schematic diagram of the belt grinding mechanism of the weld grinding equipment of the present invention.

[0028] Reference numerals:

[0029] 10. Workbench; 110. Adjustment slot; 20. Turntable; 210. Rotation axis; 30. Fixing mechanism; 310. Fixing plate; 320. Calibrator; 321. Oil tank; 322. Cylinder; 323. Square rod; 324. Clamping rod; 330. Positioning needle; 331. Needle body; 332. Needle head; 340. Hydraulic tank; 350. Piston 1; 360. First oil pipe; 370. Spring; 380. Fixing screw; 390. Moving plate; 40. Belt Grinding mechanism; 410, adjusting screw; 420, moving seat; 440, rotating seat; 450, alignment fixture; 451, fixture screw; 452, fixture motor; 453, moving block; 454, clamp; 455, elastic rod; 460, guide roller; 470, moving table; 480, active roller; 490, grinding belt; 400, compensator; 401, telescopic oil tank; 402, balancing oil tank; 404, second oil pipe; 409, positioning roller; 90, box body. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0031] like Figures 1 to 5 As shown, and refer to Figure 1 As shown in the figure, the embodiment of the weld grinding device of the present invention comprises a workbench 10, a turntable 20, a fixing mechanism 30, a driving mechanism and a belt grinding mechanism 40. The turntable 20 is rotatably mounted on the workbench 10 and is used to place the battery box body 90; the fixing mechanism 30 is arranged on the turntable 20 and is used to fix the body 90 on the turntable 20; the driving mechanism is arranged at the bottom of the workbench 10 and is used to drive the turntable 20 to rotate back and forth; four groups of belt grinding mechanisms 40 are movably assembled on the workbench 10 and are respectively located at the left front, right front, left rear and right rear of the turntable 20, and are used to grind the welds on the four sides of the body 90.

[0032] like Figure 1 As shown, the workbench 10 is in a rectangular shape, and an adjustment slot 110 corresponding to each belt grinding mechanism 40 and extending along the diagonal direction of the workbench 10 is opened on the workbench 10 .

[0033] like Figure 2 As shown, a straight groove extending forward and backward is provided on the turntable 20 , and four rotating shafts 210 are fixed on the turntable 20 , which are respectively located at the left front, right front, left rear and right rear of the center of the turntable 20 .

[0034] like Figure 1 and Figure 2As shown, the fixing mechanism 30 includes a fixing plate 310 , a calibrator 320 , a positioning needle 330 , a hydraulic tank 340 , a piston 1 350 , a first oil pipe 360 ​​, a spring 370 , a fixing screw 380 , and a moving plate 390 .

[0035] The fixing screw 380 extends forward and backward and is rotatably installed in the straight groove on the turntable 20. The fixing screw 380 has a forward thread section and a reverse thread section. Two fixing plates 310 are symmetrically arranged and assembled in the straight groove on the turntable 20 by moving forward and backward. The fixing plate 310 located in front of the center of the turntable 20 is provided with a forward threaded hole and is threadedly connected with the forward thread section of the fixing screw 380. The fixing plate 310 located behind the center of the turntable 20 is provided with a reverse threaded hole and is threadedly connected with the reverse thread section of the fixing screw 380. When fixing the box body 90, the box body 90 is placed on the turntable 20, and the two fixing plates 310 are located at the front and rear sides outside the box body 90. The fixing screw 380 is rotated by manual or electric control, and the fixing screw 380 drives the two fixing plates 310 to approach each other, so that the two fixing plates 310 clamp the box body 90, thereby fixing the box body 90 on the turntable 20, so that the box body 90 can be quickly fixed or released, which is convenient for clamping.

[0036] The calibrator 320 corresponds to each belt grinding mechanism 40 and is located between each belt grinding mechanism 40 and the center of the turntable 20. Each calibrator 320 includes an oil tank 321 rotatably sleeved outside the rotating shaft 210 and a clamping rod 324 fixed to the outer end of the oil tank 321. The oil tank 321 includes a cylindrical portion 322 coaxially arranged with the rotating shaft 210, a square rod portion 323 fixedly connected to the cylindrical portion 322, and a return torsion spring is arranged between the cylindrical portion 322 and the rotating shaft 210. The clamping rod 324 is fixedly sleeved on the outer end of the square rod portion 323 and extends from the bottom of the box body 90 to the outside of the box body 90. When the box body 90 is fixed, the calibrator 320 is located inside the box body 90 and can be rotated horizontally around the rotation axis 210 until the calibrator 320 is aligned with the projection of the diagonal of the box body 90 in the horizontal plane, so as to realize the positioning of the projection of the diagonal of the box body 90 in the horizontal plane, and provide a reference line through the clamping rod 324 extending outside the box body 90, so that the belt grinding mechanism 40 can use this as a reference for position calibration and move to face the calibrator 320, that is, face the weld of the box body 90, thereby ensuring that the weld is polished more evenly and smoothly, reducing weld defects caused by uneven grinding, and helping to maintain the consistency of product appearance and quality.

[0037] The positioning pin 330 corresponds to each calibrator 320. The positioning pin 330 is installed on each calibrator 320 and can be extended relative to the calibrator 320. The tip of the positioning pin 330 is used to push the inner wall of the box 90, so that when the positioning pin 330 is extended relative to the calibrator 320, it can drive the calibrator 320 to rotate to align with the projection of the diagonal line of the box 90 in the horizontal plane under the restriction of the inner wall of the box 90. The positioning pin 330 includes a needle body 331 and a needle head 332. The needle body 331 is in the shape of a round rod. The cross section of the needle head 332 is triangular and extends up and down. It is suitable for positioning at the corners of the box 90. It can touch two adjacent edges at the same time to help ensure the accuracy of diagonal positioning. The tip of the needle head 332 has an arc-shaped chamfer to avoid damaging the inner wall of the box 90. When it contacts the inner wall of the box 90, it can move along the inner wall of the box 90 to help the positioning pin 330 move to the diagonal position.

[0038] The hydraulic tank 340 corresponds to each calibrator 320. Each hydraulic tank 340 is fixedly mounted on the turntable 20 and contains hydraulic oil. Each piston 1 350 is mounted in the hydraulic tank 340. Two hydraulic tanks 340 are respectively arranged between each fixed plate 310 and the center of the turntable 20. Each hydraulic tank 340 is connected to the cylindrical portion 322 through a first oil pipe 360, so that the hydraulic tank 340 is connected to the calibrator 320. Two movable plates 390 are symmetrically arranged and assembled in the straight groove on the turntable 20 to move forward and backward. Each movable plate 390 is located between the fixed plate 310 and the piston 1 350 and is connected to the piston 1 350 through a spring 370. The movable plate 390 located in front of the center of the turntable 20 has a positive threaded hole and is threadedly connected to the positive threaded section of the fixed screw 380. The movable plate 390 located behind the center of the turntable 20 has a reverse threaded hole and is threadedly connected to the reverse threaded section of the fixed screw 380. When the box body 90 is fixed, the movable plate 390 is located in the box body 90, and the two fixed plates 310 approach each other to clamp the box body 90, while the two movable plates 390 approach each other, and the piston 1 350 moves with the movable plate 390 in the hydraulic tank 340, increasing the hydraulic oil pressure from the hydraulic tank 340 to the calibrator 320, thereby driving the positioning needle 330 to extend relative to the calibrator 320. The setting of the spring 370 can adapt to boxes 90 with different length and width ratios to improve the versatility of the equipment.

[0039] like Figures 1 to 5 As shown, the belt grinding mechanism 40 includes an adjusting screw 410, a movable seat 420, a sliding seat, a rotating seat 440, an alignment fixture 450, a guide roller 460, a movable table 470, an active roller 480, a grinding belt 490, a compensator 400, a positioning roller 409, and a grinding motor.

[0040] The adjusting screw 410 is rotatably mounted in the adjusting slot 110 on the workbench 10, and the moving seat 420 is movably assembled in the adjusting slot 110 on the workbench 10, and a threaded hole is provided for threaded connection with the adjusting screw 410. The adjusting screw 410 is rotated by manual or electric control, and the adjusting screw 410 drives the moving seat 420 to drive the belt grinding mechanism 40 to move along the adjusting slot 110, so that when the size of the box 90 to be polished changes greatly, the position of the belt grinding mechanism 40 on the workbench 10 is roughly adjusted, thereby expanding the applicable range of the device to the size of the box 90. The sliding seat is movably assembled on the moving seat 420 along the width direction of the adjusting slot 110, and the rotating seat 440 is rotatably mounted on the sliding seat, so that the belt grinding mechanism 40 can rotate freely in the horizontal plane and can slide freely along the width direction of the adjusting slot 110, that is, the belt grinding mechanism 40 can move freely within a certain range to achieve the position calibration of the belt grinding mechanism 40. The alignment fixture 450 is installed on the rotating seat 440 and is used to clamp the clamping rod 324 of the calibrator 320 so that the belt grinding mechanism 40 moves to face the calibrator 320 , that is, face the welding seam of the box body 90 .

[0041] The alignment fixture 450 includes a fixture screw 451, a fixture motor 452, a moving block 453, a clamp plate 454, and an elastic rod 455. The fixture screw 451 extends along the width direction of the rotating seat 440 and is rotatably mounted on the rotating seat 440. The fixture screw 451 has a forward thread segment and a reverse thread segment. The fixture motor 452 is mounted on the rotating seat 440 to drive the fixture screw 451 to rotate. Two moving blocks 453 are symmetrically arranged and movably assembled on the rotating seat 440 along the width direction of the rotating seat 440. One of the moving blocks 453 is provided with a forward threaded hole and is threadedly connected to the forward thread segment of the fixture screw 451. The other moving block 453 is provided with a reverse threaded hole and is threadedly connected to the reverse thread segment of the fixture screw 451. The two clamping plates 454 are symmetrically arranged and are assembled on the rotating seat 440 in a movable manner along the width direction of the rotating seat 440. The two clamping plates 454 are located between the two moving blocks 453. Each clamping plate 454 is provided with a through hole for passing the clamp screw 451. The elastic rod 455 is connected between each moving block 453 and the clamping plate 454. The clamp screw 451 is controlled to rotate by the clamp motor 452, and the clamp screw 451 drives the two moving blocks 453 to approach each other, so that the two moving blocks 453 push the two clamping plates 454 to approach each other through the elastic rod 455, so that the two clamping plates 454 clamp the clamping rod 324 of the calibrator 320.

[0042] Two guide rollers 460 are rotatably mounted on the rotating seat 440, the moving platform 470 is movably mounted on the rotating seat 440 along the length direction of the rotating seat 440, the driving roller 480 is rotatably mounted on the moving platform 470, the grinding belt 490 is wound around the guide rollers 460 and the driving roller 480 in a closed loop, the grinding motor is arranged at the bottom end of the rotating seat 440 to drive the driving roller 480 to rotate, so that the driving roller 480 drives the grinding belt 490 to rotate, and when the grinding belt 490 is squeezed by the side of the box 90, the grinding belt 490 will be concave inward to increase the contact area between the grinding belt 490 and the box 90. The positioning roller 409 is rotatably mounted on the rotating seat 440 and is located between the two guide rollers 460, and can support the grinding belt 490 when the grinding belt 490 is concave inward to increase the force of the grinding belt 490 on the welding seam of the box 90.

[0043] When the driving mechanism drives the turntable 20 to drive the box body 90 to reciprocate, the box body 90 has a first rotation direction that is the same as the rotation direction of the grinding belt 490 and a second rotation direction that is opposite to the rotation direction of the grinding belt 490. When the box body 90 rotates along the first rotation direction, since the rotation direction of the box body 90 is the same as the rotation direction of the grinding belt 490, the friction force of the grinding belt 490 on the box body 90 is smaller than the friction force of the grinding belt 490 when the box body 90 rotates along the second rotation direction. In order to compensate for the friction force when the box body 90 rotates along the first rotation direction, so that the friction force of the box body 90 during the reciprocating rotation is uniform, a compensator 400 is provided on the rotating seat 440 in the embodiment, which is used to increase the tension of the grinding belt 490 when the box body 90 rotates along the first rotation direction, so as to compensate for the friction of the grinding belt 490 on the box body 90 at this time, thereby ensuring the consistency of the grinding effect.

[0044] The compensator 400 includes a telescopic oil tank 401, a balancing oil tank 402, a second piston, and a second oil pipe 404. The telescopic oil tank 401 is installed between a clamping plate 454 facing the first rotation direction and a rotating seat 440, and contains hydraulic oil. The balancing oil tank 402 is fixed on the rotating seat 440. The second piston is installed in the balancing oil tank 402 and is fixedly connected to the moving platform 470. The second oil pipe 404 is connected between the telescopic oil tank 401 and the balancing oil tank 402. When the housing 90 rotates along the first rotation direction, the clamping plate 454 facing the first rotation direction is pushed by the clamping rod 324 to squeeze the telescopic oil tank 401, and the volume of the telescopic oil tank 401 becomes smaller, so that the pressure of the hydraulic oil flowing from the telescopic oil tank 401 to the balancing oil tank 402 increases, so as to push the second piston to drive the moving platform 470 to move in a direction away from the guide roller 460, so that the active roller 480 on the moving platform 470 is away from the guide roller 460, so as to increase the tension of the grinding belt 490.

[0045] The working process of the embodiment of the weld grinding device of the present invention comprises the following steps:

[0046] The first step is to fix the box body 90, with the opening facing downward, on the turntable 20, with the two fixed plates 310 located at the front and rear sides outside the box body 90, and the fixing screw 380 is rotated, and the fixing screw 380 drives the two fixed plates 310 to approach each other, so that the two fixed plates 310 clamp the box body 90 and fix the box body 90 on the turntable 20; at the same time, the fixing screw 380 drives the two movable plates 390 to approach each other, and the piston 1 350 moves with the movable plate 390 in the hydraulic tank 340, increasing the hydraulic oil pressure from the hydraulic tank 340 to the calibrator 320, driving the positioning pin 330 to extend relative to the calibrator 320, and the tip of the positioning pin 330 pushes the inner wall of the box body 90. Under the restriction of the inner wall of the box body 90, the positioning pin 330 drives the calibrator 320 to rotate until it is aligned with the projection of the diagonal line of the box body 90 in the horizontal plane, and the projection of the diagonal line of the box body 90 in the horizontal plane is positioned.

[0047] The second step is calibration. The clamp motor 452 controls the clamp screw 451 to rotate, and the clamp screw 451 drives the two moving blocks 453 to approach each other. The two moving blocks 453 push the two clamps 454 to approach each other through the elastic rod 455, so that the two clamps 454 clamp the clamping rod 324 of the calibrator 320. During the clamping process, the two clamps 454 use the reference line provided by the clamping rod 324 as a reference to drive the belt grinding mechanism 40 to move to face the calibrator 320, that is, face the weld of the box body 90.

[0048] The third step is polishing. The polishing motor drives the active roller 480 to rotate, and the active roller 480 drives the polishing belt 490 to rotate. The polishing belt 490 is squeezed inward by the side of the box body 90, and the driving mechanism drives the turntable 20 to drive the box body 90 to rotate reciprocatingly. The box body 90 reciprocates between the first rotation direction and the second rotation direction. When the box body 90 rotates along the first rotation direction, the clamping plate 454 facing the first rotation direction is pushed by the clamping rod 324 to squeeze the telescopic oil tank 401, and the volume of the telescopic oil tank 401 becomes smaller. The pressure of the hydraulic oil flowing from the telescopic oil tank 401 to the balancing oil tank 402 increases, so as to push the piston 2 to drive the movable platform 470 to move away from the guide roller 460, so that the active roller 480 on the movable platform 470 is away from the guide roller 460, thereby increasing the tension of the polishing belt 490 and compensating for the friction force of the polishing belt 490 on the box body 90 when it rotates along the first rotation direction.

[0049] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and 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 orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A weld grinding device, comprising a workbench, a turntable rotatably mounted on the workbench, a fixing mechanism arranged on the turntable, a driving mechanism arranged at the bottom end of the workbench, and four sets of belt grinding mechanisms arranged on the workbench, characterized in that: The fixing mechanism includes two fixing plates symmetrically arranged and assembled on the turntable for forward and backward movement, a calibrator located between each belt grinding mechanism and the center of the turntable and rotatably mounted on the turntable, a positioning needle mounted on each calibrator and extending and retracting relative to the calibrator, two hydraulic tanks located between each fixing plate and the center of the turntable and fixed on the turntable, and a piston 1 installed in each hydraulic tank and elastically connected to the fixing plate; each hydraulic tank is connected to the calibrator, and the piston 1 adjusts the hydraulic oil pressure flowing from the hydraulic tank to the calibrator to drive the positioning needle to extend and retract, and the tip of the positioning needle pushes the inner wall of the box body, so that when the positioning needle is extended, the calibrator is driven to rotate to align with the projection of the diagonal line of the box body on the horizontal plane under the restriction of the inner wall of the box body; each belt grinding mechanism is movably assembled on the workbench, and the belt grinding mechanism includes a positioning fixture for clamping the calibrator so that the belt grinding mechanism moves to face the calibrator; Four rotating shafts are fixed on the turntable, which are respectively located at the left front, right front, left rear and right rear of the center of the turntable. Each calibrator includes an oil tank rotatably sleeved outside the rotating shaft. The oil tank includes a cylindrical part coaxially arranged with the rotating shaft and a square rod part fixed with the cylindrical part. A reset torsion spring is arranged between the cylindrical part and the rotating shaft. The cylindrical part is connected to the hydraulic tank through a first oil pipe. The calibrator also includes a clamping rod which is fixedly sleeved on the outer end of the square rod part, and the clamping rod extends from the bottom inside the box body to the outside of the box body.

2. A weld grinding device according to claim 1, characterized in that: The positioning needle comprises a needle body and a needle head, wherein the needle body is in the shape of a round rod, the cross section of the needle head is triangular and extends up and down, and the tip of the needle head has an arc-shaped chamfer.

3. A weld grinding device according to claim 1, characterized in that: The fixing mechanism also includes a fixed screw extending forward and backward and rotatably mounted on the turntable, and two movable plates symmetrically arranged and assembled on the turntable for forward and backward movement, each movable plate being located between the fixed plate and piston one and connected to piston one through a spring, the fixed screw having a forward threaded section and a reverse threaded section, the movable plate and the fixed plate located in front of the center of the turntable are respectively provided with forward threaded holes and are threadedly connected to the forward threaded section of the fixed screw, and the movable plate and the fixed plate located behind the center of the turntable are respectively provided with reverse threaded holes and are threadedly connected to the reverse threaded section of the fixed screw.

4. A weld grinding device according to claim 1, characterized in that: The workbench is provided with adjustment grooves corresponding to the belt grinding mechanisms and extending along the diagonal direction of the workbench. Each of the belt grinding mechanisms also includes an adjustment screw rotatably installed in the adjustment groove, a movable seat movably assembled in the adjustment groove, a sliding seat movably assembled on the movable seat along the width direction of the adjustment groove, and a rotating seat rotatably installed on the sliding seat. The movable seat is provided with a threaded hole threadedly connected to the adjustment screw, and the alignment fixture is installed on the rotating seat.

5. A weld grinding device according to claim 4, characterized in that: The alignment clamp includes a clamp screw whose length extends along the width direction of the rotating seat and is rotatably installed on the rotating seat, a clamp motor installed on the rotating seat to drive the clamp screw to rotate, two moving blocks symmetrically arranged and assembled on the rotating seat for movement along the width direction of the rotating seat, two clamping plates symmetrically arranged and assembled on the rotating seat for movement along the width direction of the rotating seat, and an elastic rod connected between the moving blocks and the clamping plates, wherein the clamp screw has a forward threaded section and a reverse threaded section, wherein one of the moving blocks is provided with a forward threaded hole and is threadedly connected to the forward threaded section of the clamp screw, and the other moving block is provided with a reverse threaded hole and is threadedly connected to the reverse threaded section of the clamp screw.

6. A weld grinding device according to claim 5, characterized in that: The belt grinding mechanism also includes two guide rollers rotatably mounted on a rotating seat, a movable platform movably mounted on the rotating seat along the length direction of the rotating seat, an active roller rotatably mounted on the movable platform, a grinding belt wound around the guide rollers and the active roller in a closed loop, a grinding motor arranged at the bottom end of the rotating seat to drive the active roller to rotate, and a compensator arranged on the rotating seat.

7. A weld grinding device according to claim 6, characterized in that: When the driving mechanism drives the turntable to drive the box to rotate reciprocatingly, the box has a first rotation direction that is the same as the rotation direction of the grinding belt and a second rotation direction that is opposite to the rotation direction of the grinding belt. The compensator includes a telescopic oil tank installed between a clamp facing the first rotation direction and a rotating seat, a balancing oil tank fixed on the rotating seat, a second piston installed in the balancing oil tank and fixedly connected to the moving platform, and a second oil pipe connected between the telescopic oil tank and the balancing oil tank.

8. The weld grinding equipment according to claim 6, characterized in that: The belt grinding mechanism also includes a positioning roller which is rotatably mounted on the rotating seat and is located between the two guide rollers.

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