Welding and grinding platform for L-shaped workpieces

Abstract

The invention discloses an L-shaped workpiece welding and grinding platform which comprises a base, a grinding robot for grinding an L-shaped workpiece is arranged on the base, a clamping part comprises a driving block, a clamping mechanism with a detection function and a centering rod which is matched with the clamping mechanism for use and is in an open state in a normal state, and after the L-shaped workpiece is centered, the clamping mechanism is driven by the driving block to rotate; and when the clamping mechanism clamps the L-shaped workpiece and detects that the clamping force reaches a set threshold value, the centering rod is contained in the driving block. In a normal state, the two sets of centering rods are in a V-shaped opening state, the contact position can be automatically adjusted according to the widths of different ribs on the L-shaped workpieces, the L-shaped workpieces of different sizes and specifications can be adapted without replacing a clamp, the adaptability defect that a traditional limiting plate has one type of one plate is thoroughly overcome, and the multi-category production requirement is met.

Description

Technical Field

[0001] This invention relates to the field of L-shaped workpiece grinding technology, and more particularly to an L-shaped workpiece welding and grinding platform. Background Technology

[0002] LNG carriers, short for liquefied natural gas carriers, are specialized equipment for ocean transport of LNG (liquefied natural gas) at temperatures as low as -163 degrees Celsius. The production of LNG carriers requires the use of L-shaped workpieces, the shape of which is as follows: Figure 11 As shown, the L-shaped plate is welded with two ribs of the same shape. After welding, it is installed on a grinding platform to grind the weld seam and the back of the weld to ensure that it meets production requirements.

[0003] Currently, there are two main methods for grinding workpieces after welding. These two methods differ significantly in terms of work efficiency, quality stability, and adaptability, as detailed below: The first method is manual welding and grinding: During operation, the workpiece is clamped in place using a fixture, and then workers manually grind the weld area and the back side of the workpiece. The core limitation of this method is its high reliance on the operator's experience. Because the grinding force, angle, and path used by workers lack uniform standards, the grinding quality of different workpieces can easily vary, making it difficult to meet the consistency requirements of mass production. However, its advantage lies in the fact that it does not require precise centering of the workpiece, making it suitable for flexible handling scenarios involving small batches and multiple types of workpieces. The second method is automated grinding: This method also uses fixtures to hold the workpiece, and then a grinding robot completes the grinding operation according to a preset program. Compared to manual methods, the core advantage of this method is the high stability of grinding quality. The grinding robot's operation time and path are precisely controlled by a PLC program. For different workpiece models, only the corresponding program needs to be matched to ensure grinding accuracy, effectively avoiding the subjective errors of manual operation. However, this method places strict requirements on the placement of the workpiece: if the workpiece is not in the preset fixed position, it will directly cause deviation in the robot's grinding path, thus leading to quality problems. To address the workpiece positioning problem in automated grinding, existing solutions typically involve installing a cylinder-driven limiting plate at the rear of the grinding platform. During operation, the workpiece is first placed on the platform, abutting against the limiting plate for initial positioning. Then, a fixture clamps the workpiece, and finally, the limiting plate resets, completing the workpiece alignment and centering. However, this positioning solution has significant limitations in adaptability. The limiting plate's positioning range is fixed, only meeting the alignment requirements of a single workpiece model. When dealing with workpieces of different sizes and specifications, its positioning and centering capabilities become apparent, failing to meet diverse production needs. Furthermore, adding multiple sets of dedicated fixtures to accommodate various workpiece models would significantly increase equipment procurement and maintenance costs, contradicting the company's goal of cost reduction and efficiency improvement.

[0004] Therefore, this application proposes an L-shaped workpiece welding and grinding platform. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned technical problems by proposing an L-shaped workpiece welding and grinding platform.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An L-shaped workpiece welding and grinding platform includes a base, on which a grinding robot for grinding L-shaped workpieces is mounted, and further includes... A support device for limiting L-shaped workpieces and located on a base, the support device includes a drive unit for supporting and driving the L-shaped workpiece to rotate, the drive unit has a central area, the drive unit is provided with a clamping part that can move relative to it, the clamping part includes a drive block, a clamping mechanism with a detection function, and a central rod that works with the clamping mechanism and is normally in an open state, the open central rod forms a central structure for centering the L-shaped workpiece, the clamping part moves so that the central rod abuts against the L-shaped workpiece and drives it to be located in the central area. After the L-shaped workpiece is centered, when the clamping mechanism clamps the L-shaped workpiece and detects that the clamping force has reached the set threshold, the centering rod is retracted into the drive block.

[0007] Preferably, the centering rods are in two sets and are movably arranged on both sides of the drive block. Under normal conditions, the two sets of centering rods are in an open state, and when grinding the L-shaped workpiece, the two sets of centering rods are in a folded state.

[0008] Preferably, there are two sets of support devices, which are arranged on both sides of the grinding robot, and the grinding robot alternately grinds the L-shaped workpieces on the two sets of support devices.

[0009] Preferably, the drive block is hollow inside, the bottom of the drive block is provided with an inclined surface, the lower end of the drive block is provided with a vertical surface for clamping the L-shaped workpiece, and the upper end of the vertical surface is connected to the lower end of the inclined surface.

[0010] Preferably, the side of the drive block is provided with a storage groove that communicates with the interior and is used to store the centering rod. The storage groove and the drive block are equipped with a drive structure that can drive the centering rod to rotate into the storage groove.

[0011] Preferably, the driving structure includes a sleeve fixed to the top of the driving block, an electromagnet fixed inside the sleeve, and a magnetic block slidably disposed in cooperation with the electromagnet, the bottom of the magnetic block being fixed with a spiral rod, a rotating tube being provided at the bottom of the storage groove, the centering rod being fixed on the rotating tube, and the spiral rod being inserted into the rotating tube.

[0012] Preferably, after the magnetic block is energized, the electromagnet drives the magnetic block and the screw rod to move downward due to the repulsive force. The downward movement of the screw rod drives the rotating tube and the centering rod to rotate. After the electromagnet is de-energized, the magnetic block moves upward to reset through the elastic element used for the magnetic block, and the centering rod rotates to reset.

[0013] Preferably, the clamping mechanism includes a movable block that slides against the driving block, a clamping block is fixed at the bottom, a driven piston cylinder is fixed at the inner top of the driving block, and a driven piston block that is fixedly connected to the upper end of the movable block is slidably connected inside the driven piston cylinder. It also includes a liquid supply structure, which includes an active piston cylinder, an active piston block slidably connected inside the active piston cylinder, a reset component for resetting the active piston block is provided between the active piston block and the active piston cylinder, a drive column is fixed on the active piston block, and a flow channel for conveying hydraulic oil is provided through the drive column and the active piston block, and the flow channel is connected to the driven piston cylinder through a delivery pipe.

[0014] Preferably, the active piston cylinder is provided with a detection unit, which is used to detect the pressure inside the active piston cylinder, and the detection unit is electrically connected to the electromagnet through a controller.

[0015] Preferably, the detection unit includes a mounting tube installed on the active piston cylinder, and a pressure sensor is mounted on the mounting tube.

[0016] Compared with the prior art, the beneficial effects of this invention are as follows: 1. Under normal conditions, the two sets of center rods are in a V-shaped open state, which can automatically adjust the contact position according to the width of different ribs on the L-shaped workpiece. It can adapt to L-shaped workpieces of different sizes and specifications without changing the fixture, completely solving the compatibility defect of the traditional limit plate "one plate, one model" and meeting the needs of multi-category production.

[0017] 2. The centering rod is not rigidly fixed. When it comes into contact with the rib, it can deflect slightly with the force (the included angle decreases). This avoids rigid collision damage to the workpiece and ensures that the drive block continues to move until the clamping is completed, further improving the compatibility with workpieces of different sizes.

[0018] 3. The detection department monitors the pressure inside the active piston cylinder in real time. When the pressure reaches the set threshold (i.e., the clamping force meets the standard), the automatic control drive device stops and the centering rod is retracted. This avoids workpiece displacement caused by insufficient clamping force and prevents workpiece damage caused by excessive clamping force. At the same time, it will not affect the subsequent grinding of the weld seam between the rib and the L-shaped plate.

[0019] 4. After clamping is completed, the electromagnet is de-energized or energized in reverse. The elastic element drives the magnetic block and the spiral rod to reset, so that the centering rod is automatically stored in the storage slot. After the workpiece is removed, the electromagnet is energized again, and the centering rod slowly opens under the action of repulsion (not instantaneous reset), avoiding collision with the workpiece ribs and causing damage. No manual adjustment of the positioning components is required throughout the process, reducing the difficulty of operation.

[0020] In summary, under normal conditions, the two sets of centering rods of this invention are in a V-shaped open state, and the contact position can be automatically adjusted according to the width of different ribs on the L-shaped workpiece. It can adapt to L-shaped workpieces of different sizes and specifications without changing the fixture, completely solving the compatibility defect of the traditional limit plate of "one plate, one model", and meeting the needs of multi-category production. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an L-shaped workpiece welding and grinding platform proposed in this invention; Figure 2 This is a front view of an L-shaped workpiece welding and grinding platform proposed in this invention; Figure 3 This is a schematic diagram of the support device in an L-shaped workpiece welding and grinding platform proposed in this invention; Figure 4 This is a schematic diagram of the drive unit in an L-shaped workpiece welding and grinding platform proposed in this invention; Figure 5 This is a schematic diagram of the clamping part in an L-shaped workpiece welding and grinding platform proposed in this invention; Figure 6 This is a front view of the clamping part in an L-shaped workpiece welding and grinding platform proposed in this invention; Figure 7 This is a side view of the clamping part in an L-shaped workpiece welding and grinding platform proposed in this invention; Figure 8 This is a split view of the fluid supply structure in an L-shaped workpiece welding and grinding platform proposed in this invention; Figure 9 This is an exploded view of the drive structure in an L-shaped workpiece welding and grinding platform proposed in this invention; Figure 10 This is a schematic diagram of the structure of the driven piston cylinder in an L-shaped workpiece welding and grinding platform proposed in this invention. Figure 11 This is a schematic diagram showing the L-shaped workpiece that needs to be ground.

[0022] In the diagram: 100, base; 200, support device; 210, support platform; 220, drive unit; 221, reducer; 222, drive shaft; 223, connecting block; 224, support plate; 225, triangular support plate; 230, clamping part; 231, mounting block; 232, liquid supply structure; 2321, active piston cylinder; 2322, detection unit; 2323, active piston block; 2324, reset component; 2325, drive column; 2326, flow channel; 233, drive block; 23 31. Centering rod; 2332. Inclined plane; 2333. Vertical plane; 2334. Storage slot; 2335. Moving block; 2336. Clamping block; 234. Driven piston cylinder; 2341. Driven piston block; 2342. Conveying pipe; 235. Drive structure; 2351. Sleeve; 2352. Electromagnet; 2353. Elastic element; 2354. Magnetic block; 2355. Helical rod; 2356. Rotating tube; 300. Placement device; 400. Grinding robot; 500. L-shaped workpiece. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0024] Reference Figures 1-10 An L-shaped workpiece welding and grinding platform includes a base 100, on which a grinding robot 400 for grinding L-shaped workpieces 500 is mounted, and further includes... A support device 200 is provided for limiting the L-shaped workpiece 500 and located on the base 100. The support device 200 includes a drive part 220 for supporting the L-shaped workpiece 500 and driving it to rotate. The drive part 220 has a central area and a clamping part 230 that can move relative to it. The clamping part 230 includes a drive block 233, a clamping mechanism with a detection function, and a central rod 2331 that is used in conjunction with the clamping mechanism and is normally in an open state. The open central rod 2331 forms a central structure for centering the L-shaped workpiece 500. The clamping part 230 moves so that the central rod 2331 abuts against the L-shaped workpiece 500 and drives it to be located in the central area. After the L-shaped workpiece 500 is centered, when the clamping mechanism clamps the L-shaped workpiece 500 and detects that the clamping force has reached the set threshold, the centering rod 2331 is stored in the drive block 233. In this way, it will not affect the grinding robot 400 from grinding the weld and back of the L-shaped workpiece 500.

[0025] like Figure 1 , Figure 2The base 100 is also equipped with a placement device 300 for placing grinding heads. The placement device 300 has a rack for placing grinding heads, and the grinding robot 400 can change the grinding heads on the placement device 300 as needed.

[0026] For example, 3. Figure 5 As shown, there are two sets of centering rods 2331, which are movably arranged on both sides of the drive block 233. In the normal state, the two sets of centering rods 2331 are in an open state. When grinding the L-shaped workpiece 500, the two sets of centering rods 2331 are in a folded state. When the two sets of centering rods 2331 are in the open state, they form a V-shape with the drive block 233. This arrangement can adapt to the width between different ribs on the L-shaped workpiece 500, thereby adapting to the centering positioning of different L-shaped workpieces 500.

[0027] like Figure 1 , Figure 2 As shown, there are two sets of support devices 200, which are set on both sides of the grinding robot 400. The grinding robot 400 alternately grinds the L-shaped workpiece 500 on the two sets of support devices 200. The support device 200 also includes a support platform 210 fixed on the base 100, and a drive unit 220 is mounted on the support platform 210.

[0028] like Figure 3 , Figure 4 As shown, the drive unit 220 is explained in detail. The drive unit 220 includes two hollow triangular support plates 225 fixed on the support platform 210. A drive shaft 222 is rotatably mounted on the two triangular support plates 225 via bearings. A connecting block 223 is welded to the end of the drive shaft 222. A support plate 224 for supporting the L-shaped workpiece 500 is welded to the lower end of the two connecting blocks 223. The width of the support plate 224 is smaller than the width of the L-shaped workpiece 500, so as not to interfere with the grinding of the back of the L-shaped workpiece 500 corresponding to the rib.

[0029] A speed reducer 221 is mounted on one of the triangular support plates 225. The speed reducer 221 is connected to the corresponding drive shaft 222 through a synchronization assembly. Specifically, both the drive shaft 222 and the speed reducer 221 have synchronous pulleys at their ends. The two synchronous pulleys are connected by a synchronous belt. The speed reducer 221 operates through the synchronization assembly, which enables the drive shaft 222 and the support plate 224 to rotate, thereby facilitating the adjustment of the angle of the L-shaped workpiece 500 for grinding work.

[0030] Reference Figure 6The drive block 233 is hollow inside, and the bottom of the drive block 233 has an inclined surface 2332. The inclined surface 2332 is designed to accommodate L-shaped workpieces 500 with different slopes, increasing the applicability of the drive block 233 and the clamping block 2336. The lower end of the drive block 233 has a vertical surface 2333 for clamping the L-shaped workpiece 500. The upper end of the vertical surface 2333 is connected to the lower end of the inclined surface 2332. The vertical surface 2333 abuts against both ends of the L-shaped workpiece 500, which is the first step of clamping. The clamping block 2336 on the upper side abuts against the upper end of the L-shaped workpiece to complete the second step of clamping.

[0031] like Figure 5 , Figure 6 , Figure 7 As shown, the side of the drive block 233 is provided with a storage groove 2334 that communicates with the interior and is used to store the centering rod 2331. The storage groove 2334 and the drive block 233 are equipped with a drive structure 235 that can drive the centering rod 2331 to rotate into the storage groove 2334, thereby avoiding interference between the centering rod 2331 and the grinding head and the grinding robot 400.

[0032] like Figure 9 As shown, the drive structure 235 includes a sleeve 2351 fixed to the top of the drive block 233, the internal space of the sleeve 2351 being rectangular; an electromagnet 2352 is fixed inside the sleeve 2351, and a magnetic block 2354, which is slidably disposed and capable of resetting, is also rectangular, so that the magnetic block 2354 will not rotate inside the sleeve 2351; a helical rod 2355 is fixed to the bottom of the magnetic block 2354, and a rotating tube 2356 is rotatably disposed at the bottom of the receiving groove 2334 via a bearing, the rotating tube 2356 having threads that engage with the helical rod 2355, so that when the helical rod 2355 moves down, it can drive the rotating tube 2356 to rotate; a centering rod 2331 is fixed on the rotating tube 2356, and the helical rod 2355 is inserted into the rotating tube 2356, that is, the threads are engaged in the threaded groove of the helical rod 2355.

[0033] When the magnetic block 2354 is energized, the electromagnet 2352 drives the magnetic block 2354 and the screw rod 2355 to move downwards due to the repulsive force. The downward movement of the screw rod 2355 drives the rotating tube 2356 and the centering rod 2331 to rotate. When the electromagnet 2352 is de-energized or a reverse current is supplied to the electromagnet 2352 (i.e., the positive and negative terminals of the power supply applied to the electromagnet 2352 are reversed), the elastic element 2353 used for the magnetic block 2354 causes the magnetic block 2354 to move upwards and reset, and the centering rod 2331 to rotate and reset. The elastic element 2353 is a spring with copper rings welded to both ends. The copper rings are connected to the electromagnet 2352 and the magnetic block 2354 by glue. The repulsive force between the electromagnet 2352 and the magnetic block 2354 is greater than the spring force, so the magnetic block 2354 can be driven to move by the repulsive force.

[0034] Reference Figure 6 , Figure 10 The clamping mechanism includes a movable block 2335 that slides against the drive block 233. The movable block 2335 is rectangular in shape. The bottom of the corresponding drive block 233 is provided with a rectangular through groove that matches the movable block 2335, so as to ensure that the movable block 2335 moves up and down stably. A clamping block 2336 is fixed to the bottom of the movable block 2335. The clamping block 2336 is semi-cylindrical with the arc surface located on the lower side, so as to adapt to L-shaped workpieces 500 with different slopes.

[0035] A driven piston cylinder 234 is fixed to the inner top of the drive block 233. A driven piston block 2341, which is fixedly connected to the upper end of the moving block 2335, is slidably connected inside the driven piston cylinder 234. The fluid transported inside the driven piston cylinder 234 is hydraulic oil. It also includes a liquid supply structure 232, which includes an active piston cylinder 2321 fixed on a mounting block 231. The mounting block 231 is fixed on a support plate 224, and the active piston cylinder 2321 is mounted on the mounting block 231. An active piston block 2323 is slidably connected inside the active piston cylinder 2321. A reset element 2324 for resetting the active piston block 2323 is provided between the active piston block 2323 and the active piston cylinder 2321. The reset element 2324 is a reset spring, and its two ends are fixed on the active piston cylinder 2321 and the active piston block 2323 respectively. Its purpose is to reset the active piston block 2323.

[0036] A drive column 2325 is fixed on the active piston block 2323. A flow channel 2326 for conveying hydraulic oil is provided through the drive column 2325 and the active piston block 2323. The flow channel 2326 is connected to the driven piston cylinder 234 through the delivery pipe 2342.

[0037] like Figure 4 As shown, a drive device can be installed on the support plate 224, located in the mounting box at the bottom of the support plate 224. The drive device mounting block 231 moves on the support plate 224. The device can be two lead screws driven by a motor, with opposite thread directions. The lead screws are connected to the mounting block 231 through lead screw nuts. Therefore, when the lead screws rotate, the mounting block 231 can be moved in conjunction with the lead screw nuts, that is, the two clamping parts 230 can move simultaneously relative to each other or in opposite directions; or other driving methods can be used to achieve the simultaneous relative to each other or in opposite directions of the two clamping parts 230.

[0038] Reference Figure 5 , Figure 8The active piston cylinder 2321 is provided with a detection unit 2322, which is used to detect the pressure inside the active piston cylinder 2321. The detection unit 2322 is electrically connected to the electromagnet 2352 through a controller. The detection unit 2322 includes a mounting tube installed on the active piston cylinder 2321, and a pressure sensor is installed on the mounting tube. When the pressure sensor detects that the pressure inside the active piston cylinder 2321 reaches a set threshold, the pressure sensor transmits a signal to the controller. The controller controls the electromagnet 2352 to be de-energized or to supply current in the opposite direction to the electromagnet 2352.

[0039] The following is a detailed description of the limiting grinding process for the L-shaped workpiece 500 according to the present invention: When in use, the operator only needs to place the L-shaped workpiece 500 on the support plate 224. It is important to ensure that the L-shaped workpiece 500 is stable, because the width of the support plate 224 is smaller than the width of the L-shaped workpiece 500. Then, the drive device drives the two mounting blocks 231 to move relative to each other, which in turn drives the two clamping parts 230 to move relative to each other. More specifically, the mounting block 231 drives the liquid supply structure 232, the active piston cylinder 2321, the active piston block 2323, the reset component 2324, the drive column 2325, and the drive block 233 to move. Since the two centering rods 2331 on the drive block 233 are in an open state, as the drive block 233 approaches the L-shaped workpiece 500, the centering rods 2331 abut against the ribs on the L-shaped workpiece 500. Then, the drive block 233 drives the centering rods 2331 to continue moving. Since the centering rods 2331 are in a relatively fixed state at this time, the centering rods 2331 will squeeze the ribs and limit them, so that the entire L-shaped workpiece 500 moves towards the central area of ​​the support plate 224. The final state is that both ends and all four centering rods 2331 abut against the ribs, which can ensure that the L-shaped workpiece 500 moves to the central area. Since the centering rod 2331 is V-shaped when it is open, even if the L-shaped workpiece 500 is slightly tilted, it will eventually move to the center position by the limiting of the centering rod 2331.

[0040] As the drive block 233 continues to move, the vertical surface 2333 on the drive block 233 eventually abuts against the workpiece, achieving clamping of the L-shaped workpiece 500 from both ends; that is, the drive block 233 is now limited by the L-shaped workpiece 500 and cannot move. When the mounting block 231 moves again, it will cause relative movement between the active piston block 2323 and the active piston cylinder 2321. In this way, the hydraulic oil in the active piston cylinder 2321 can be transported to the driven piston cylinder 234 through the flow channel 2326 and the delivery pipe 2342. The increased hydraulic oil in the driven piston cylinder 234 drives the driven piston block 2341 to move downward, thereby driving the moving block 2335 and the clamping block 2336 to move downward. Finally, the clamping block 2336 abuts against the upper end of the L-shaped workpiece 500, thus completing the centering and clamping positioning of the L-shaped workpiece 500.

[0041] When the pressure sensor on the detection unit 2322 detects that the pressure value inside the active piston cylinder 2321 has reached the set threshold, the threshold can be modified accordingly based on the workpiece model. At this time, the detection unit 2322 transmits a signal to the controller, which controls the drive device to stop working. Simultaneously, it supplies the opposite current to the electromagnet 2352 or cuts off the power, causing the magnetic block 2354 to reset due to magnetic attraction or through the elastic element 2353. This, in turn, drives the spiral rod 2355 to move upward, thereby driving the sleeve 2351 to rotate the centering rod 2331 into the receiving groove 2334. This will not affect the subsequent grinding of the weld seam between the rib and the L-shaped plate.

[0042] Next, the grinding robot 400 drives the grinding head to grind the L-shaped workpiece 500, that is, to grind the weld between the rib and the L-shaped plate and the back. Depending on the grinding position, the grinding robot 400 can automatically change the grinding head. During the grinding process, the drive unit 220 drives the clamped L-shaped workpiece 500 to rotate so that the grinding robot 400 can grind the L-shaped workpiece 500.

[0043] After grinding is completed, the grinding robot 400 rotates to another support device 200 to grind the L-shaped workpiece 500 at that position.

[0044] After grinding, the L-shaped workpiece 500 needs to be removed and replaced. The drive device drives the mounting block 231 to move in opposite directions. First, the active piston cylinder 2321 and the active piston block 2323 are reset. Because the reset part 2324 is in a compressed state at this time, the clamping block 2336 is reset, and then the drive block 233 is reset. The detection unit 2322 detects that the pressure value is less than the set threshold, and the electromagnet 2352 is energized. Due to the damping effect of the elastic part 2353, the centering rod 2331 does not open instantaneously, so as to avoid it colliding with the rib and causing damage to both.

[0045] Next, drive block 233 is reset, and center rod 2331 is no longer limited by ribs. Under the action of repulsion, it is also gradually reset. Finally, it is completely reset. The worker can then remove the polished L-shaped workpiece 500 and replace it with the L-shaped workpiece 500 that needs to be polished.

[0046] The above explanation of the relatively fixed centering rod 2331 is as follows: Since the magnetic block 2354 moves due to the repulsive force of the electromagnet 2352, the magnetic block 2354 is not locked at this time. Therefore, when the centering rod 2331 abuts against the rib, the centering rod 2331 will also be subjected to a corresponding force when it squeezes the rib. In this way, the centering rod 2331 will drive the rotating tube 2356 to rotate, but the rotating tube 2356 rotates in a fixed position. Therefore, when the centering rod 2331 drives the rotating tube 2356 to rotate, the rotating tube 2356 will exert a force on the screw rod 2355, such as... Figure 9 As shown, the screw rod 2355 moves upward, and the upward movement of the screw rod 2355 drives the magnetic block 2354 to move upward. At this time, the repulsive force between the magnetic blocks 2354 increases. Finally, when it can drive the L-shaped workpiece 500 to move, the magnetic block 2354 will tend to a stable state. At this time, the centering rod 2331 will deflect, and the included angle between it and the driving block 233 will decrease, making it easier to drive the rib to move. Since both ends of the L-shaped workpiece 500 are driven to move by the centering rod 2331, it is more convenient for the L-shaped workpiece 500 to move.

[0047] More importantly, due to the different sizes and models of the L-shaped workpieces 500, when the L-shaped workpiece 500 is centered by the centering rod 2331, the vertical surface 2333 on the driving block 233 has not yet abutted against the L-shaped workpiece 500. If the movement of the driving block 233 is stopped, there will be insufficient clamping stability for the L-shaped workpiece 500. Therefore, the driving block 233 will continue to move until the vertical surface 2333 on the driving block 233 abuts against the L-shaped workpiece 500. At this time, the relatively fixed centering rod 2331 will deflect, which can ensure that the driving block 233 continues to move, so as to achieve clamping and positioning of different L-shaped workpieces 500.

[0048] This type of centering rod 2331, which is set in a relatively fixed state, also achieves protection for the centering rod 2331.

[0049] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An L-shaped workpiece welding and grinding platform, comprising a base (100), wherein a grinding robot (400) for grinding an L-shaped workpiece (500) is provided on the base (100), characterized in that, It also includes, A support device (200) is provided for limiting the L-shaped workpiece (500) and located on the base (100). The support device (200) includes a drive part (220) for supporting the L-shaped workpiece (500) and driving it to rotate. The drive part (220) has a central area and a clamping part (230) that can move relative to it. The clamping part (230) includes a drive block (233), a clamping mechanism with a detection function, and a central rod (2331) that is used in conjunction with the clamping mechanism and is normally in an open state. The central rod (2331) in the open state forms a central structure that centers the L-shaped workpiece (500). The movement of the clamping part (230) causes the central rod (2331) to abut against the L-shaped workpiece (500) and drive it to be located in the central area. After the L-shaped workpiece (500) is centered, when the clamping mechanism clamps the L-shaped workpiece (500) and detects that the clamping force reaches the set threshold, the centering rod (2331) is stored in the drive block (233).

2. The L-shaped workpiece welding and grinding platform according to claim 1, characterized in that, The centering rod (2331) consists of two sets and is movably arranged on both sides of the drive block (233). Under normal conditions, the two sets of centering rods (2331) are in an open state. When grinding the L-shaped workpiece (500), the two sets of centering rods (2331) are in a folded state.

3. The L-shaped workpiece welding and grinding platform according to claim 1, characterized in that, The support device (200) consists of two sets, which are set on both sides of the grinding robot (400). The grinding robot (400) alternately grinds the L-shaped workpiece (500) on the two sets of support devices (200).

4. The L-shaped workpiece welding and grinding platform according to claim 1, characterized in that, The drive block (233) is hollow inside. The bottom of the drive block (233) is provided with an inclined surface (2332). The lower end of the drive block (233) is provided with a vertical surface (2333) for clamping the L-shaped workpiece (500). The upper end of the vertical surface (2333) is connected to the lower end of the inclined surface (2332).

5. The L-shaped workpiece welding and grinding platform according to claim 1, characterized in that, The side of the drive block (233) is provided with a storage groove (2334) that communicates with the interior and is used to store the centering rod (2331). The storage groove (2334) and the drive block (233) are equipped with a drive structure (235) that can drive the centering rod (2331) to rotate into the storage groove (2334).

6. The L-shaped workpiece welding and grinding platform according to claim 5, characterized in that, The drive structure (235) includes a sleeve (2351) fixed to the top of the drive block (233), an electromagnet (2352) fixed inside the sleeve (2351), and a magnetic block (2354) slidably arranged to cooperate with the electromagnet (2352) for resetting. A spiral rod (2355) is fixed to the bottom of the magnetic block (2354). A rotating tube (2356) is provided at the bottom of the storage groove (2334). The centering rod (2331) is fixed on the rotating tube (2356), and the spiral rod (2355) is inserted into the rotating tube (2356).

7. The L-shaped workpiece welding and grinding platform according to claim 6, characterized in that, When the magnetic block (2354) is energized, the electromagnet (2352) drives the magnetic block (2354) and the screw rod (2355) to move downward due to repulsion. The downward movement of the screw rod (2355) drives the rotating tube (2356) and the centering rod (2331) to rotate. When the electromagnet (2352) is de-energized, the magnetic block (2354) is moved upward and reset through the elastic element (2353) used for the magnetic block (2354), and the centering rod (2331) rotates and resets.

8. The L-shaped workpiece welding and grinding platform according to claim 7, characterized in that, The clamping mechanism includes a movable block (2335) that slides against the drive block (233). A clamping block (2336) is fixed to the bottom of the movable block (2335). A driven piston cylinder (234) is fixed to the inner top of the drive block (233). A driven piston block (2341) that is fixed to the upper end of the movable block (2335) is slidably connected inside the driven piston cylinder (234). It also includes a liquid supply structure (232), which includes an active piston cylinder (2321), an active piston block (2323) is slidably connected inside the active piston cylinder (2321), a reset member (2324) for resetting the active piston block (2323) is provided between the active piston block (2323) and the active piston cylinder (2321), a drive column (2325) is fixed on the active piston block (2323), and a flow channel (2326) for conveying hydraulic oil is provided through the drive column (2325) and the active piston block (2323). The flow channel (2326) is connected to the driven piston cylinder (234) through a delivery pipe (2342).

9. The L-shaped workpiece welding and grinding platform according to claim 8, characterized in that, The active piston cylinder (2321) is provided with a detection unit (2322), which is used to detect the pressure inside the active piston cylinder (2321). The detection unit (2322) is electrically connected to the electromagnet (2352) through a controller.

10. The L-shaped workpiece welding and grinding platform according to claim 9, characterized in that, The detection unit (2322) includes a mounting tube installed on the active piston cylinder (2321), on which a pressure sensor is mounted.

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