Anti-explosion valve body and top cover plate welding system and method

Abstract

The invention relates to the technical field of explosion-proof valve welding, in particular to an explosion-proof valve body and top cover piece welding system and method.The system comprises a rack, a main index plate mechanism, an explosion-proof valve body picking, installing and smoothing mechanism, a welding mechanism and a magazine mechanism; at the second station, the anti-explosion valve body picking, installing and smoothing mechanism picks up the anti-explosion valve body placed in the magazine mechanism, gradual vibration, visual positioning and angle compensation are carried out, then the anti-explosion valve body is installed at a notch of a top cover piece, the anti-explosion valve body is smoothed, and then the anti-explosion valve body is installed in the notch of the top cover piece. And at the third station, the welding mechanism welds the smoothed explosion-proof valve body and the top cover piece together, and at the fourth station, the welded product is taken away. According to the system and method, the installation position is accurate, installation is smooth, and the welding quality and welding efficiency of the explosion-proof valve body and the top cover piece are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of explosion-proof valve welding, and in particular to a welding system and method for an explosion-proof valve body and a top cover sheet. Background Art

[0002] With the rapid expansion of the electric vehicle, renewable energy, and energy storage markets, new energy battery technology is becoming a key driver of the green economy. Explosion-proof valves for energy storage and automotive power batteries are a key component that has emerged alongside the rapid development of energy storage technology and the electric vehicle industry. In battery systems, the reliable operation of explosion-proof valves is directly related to vehicle and system safety. The valve body of a battery explosion-proof valve is made of aluminum alloy, while the top cover is made of stainless steel. Both components are very thin, with the valve body in particular measuring only 0.1 to 0.3 mm thick. Precision welding these two metals requires high welding equipment and processes. Precise flatness and accurate positioning of the valve body and top cover are crucial for successful welding. Traditional explosion-proof valve welding systems use servo motor positioning systems, placing the valve body directly on the top cover before welding. This results in inaccurate positioning of the valve body, inefficient installation, and unevenness of the valve body, ultimately impacting weld quality and efficiency. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a welding system and method for an explosion-proof valve body and a top cover sheet. The installation position of the explosion-proof valve body is accurate, the installation efficiency is high, and the explosion-proof valve body is installed relatively flat, thereby improving the welding quality and welding efficiency between the explosion-proof valve body and the top cover sheet.

[0004] The present invention is achieved through the following solutions: A system for welding an explosion-proof valve body and a top cover piece, comprising a frame and a main indexing plate mechanism installed on the frame, an explosion-proof valve body picking-up, installation and smoothing mechanism, a welding mechanism and a magazine mechanism, wherein the main indexing plate mechanism is evenly provided with four groups of jig modules corresponding to the four workstations of the system, at the first workstation of the system, the top cover piece is placed on the jig module of the main indexing plate mechanism, the explosion-proof valve body picking-up, installation and smoothing mechanism and the magazine mechanism are arranged at the second workstation of the system, the explosion-proof valve body picking-up, installation and smoothing mechanism is used to pick up the explosion-proof valve body placed in the magazine mechanism and perform gradual vibration to ensure that one explosion-proof valve body is picked up at a time, after visual positioning and angle compensation of the explosion-proof valve body, the explosion-proof valve body is installed at the notch of the top cover piece of the jig module, and the explosion-proof valve body is hard-smoothed, the welding mechanism is arranged at the third workstation of the system, and is used to weld the smoothed explosion-proof valve body to the top cover piece, and the welded product is taken away at the fourth workstation of the system.

[0005] Furthermore, the main indexing plate mechanism includes a main indexing plate and a main indexing plate drive motor. The main indexing plate is driven to rotate by the main indexing plate drive motor. The four groups of fixture modules are evenly arranged on the main indexing plate. Each group of fixture modules is provided with an explosion-proof valve mounting groove, and the explosion-proof valve mounting groove is provided with a vacuum suction hole.

[0006] Optimized, there are two explosion-proof valve installation slots.

[0007] Furthermore, the fixture module is provided with a negative pressure detection mechanism, which includes a vacuum pump and a negative pressure detection pipeline. The negative pressure detection pipeline is connected between the vacuum pump and the vacuum suction hole of the explosion-proof valve installation groove. A vacuum detection head and a vacuum filter are installed on the negative pressure detection pipeline. The vacuum detection head is connected to the PLC through a signal line.

[0008] Furthermore, the magazine mechanism includes a lifting unit, a magazine unit and a rotating unit. The magazine unit includes a mounting plate and an explosion-proof valve body mounting body fixedly mounted on the mounting plate. The explosion-proof valve body mounting body is a cube structure, and two groups of limiting columns are fixedly provided on the side of each cube. An explosion-proof valve body mounting groove is provided between each group of limiting columns. The rotating unit drives the mounting plate to rotate. The lifting unit includes a lifting drive device, a lifting plate and a lifting rod. The lifting drive device drives the lifting plate to move up and down. The lifting rods are two horizontally fixedly mounted on the lifting plate, and the ends of the two lifting rods extend into the corresponding explosion-proof valve body mounting grooves.

[0009] Optimized, the magazine mechanism also includes a material presence detection sensor, which is installed on the top of the explosion-proof valve body mounting body. The material presence detection sensor is connected to the PLC through a signal line, and the PLC controls the operation of the jacking unit, the rotating unit and the explosion-proof valve body picking up, installing and smoothing mechanism.

[0010] Furthermore, the explosion-proof valve body picking, installing and smoothing mechanism includes a first transplanting X-axis module, a first transplanting Y-axis module, a first transplanting Z-axis module, a first rotating R-axis module, a suction nozzle, a Z-phase cylinder and a visual inspection unit. The first transplanting Y-axis module is installed on the first transplanting X-axis module. There are two sets of the first transplanting Z-axis module, the first rotating R-axis module, the suction nozzle and the visual inspection unit. The two first transplanting Z-axis modules are installed on the first transplanting Y-axis module. The two first rotating R-axis modules, the Z-phase cylinder and the visual inspection unit are all installed on the first transplanting Z-axis module. The two suction nozzles are installed on the first rotating R-axis module. A smoothing plate is fixedly installed on the end of the connecting rod of the Z-phase cylinder. A conductive carbon nanotube sponge is fixedly installed on the smoothing plate, and a makeshift groove is opened in the middle of the conductive carbon nanotube sponge.

[0011] Optimized, the nozzle is a non-metallic flexible nozzle.

[0012] Furthermore, the welding mechanism includes a welding mechanism column, a second transplanting X-axis module, a second transplanting Y-axis module, a second transplanting Z-axis module and a pulse laser welding device, wherein the second transplanting Y-axis module is fixedly mounted on the welding mechanism column, the second transplanting X-axis module is mounted on the second transplanting Y-axis module, the second transplanting Y-axis module drives the second transplanting X-axis module to move along the Y-axis, the second transplanting Z-axis module is mounted on the second transplanting X-axis module, the second transplanting X-axis module drives the second transplanting Z-axis module to move along the X-axis, the pulse laser welding device is mounted on the second transplanting Z-axis module, and the second transplanting Z-axis module drives the pulse laser welding device to move along the Z-axis.

[0013] A method for welding an explosion-proof valve body and a top cover sheet, comprising the following steps: S1: Place the top cover piece in the explosion-proof valve installation groove of the main indexing plate mechanism. The main indexing plate mechanism drives the top cover piece to move to the explosion-proof valve body picking up and installing the smoothing mechanism; S2: The nozzle of the explosion-proof valve body picking-up and smoothing mechanism picks up the explosion-proof valve body from the magazine mechanism and performs gradual vibration on the picked explosion-proof valve body to ensure that the single-piece explosion-proof valve body is picked up. The explosion-proof valve body is then visually positioned and the rotation angle compensation value is fed back to the PLC. The PLC controls the explosion-proof valve body picking-up and smoothing mechanism to drive the explosion-proof valve body to rotate for angle compensation. S3: Place the explosion-proof valve body after angle compensation into the notch of the top cover in the explosion-proof valve installation groove, and press it into place using a Z-phase cylinder with conductive carbon nanotube sponge. Then, perform multi-directional hard smoothing on the explosion-proof valve body. S4: Perform negative pressure detection on the explosion-proof valve body and top cover, and feed back the negative pressure value to the PLC. The PLC compares the negative pressure value with the set threshold. If the negative pressure value is greater than or equal to the set threshold, it means that the explosion-proof valve body is installed in place, and proceed to the next step. If the negative pressure value is less than the set threshold, it means that the explosion-proof valve body is not installed in place, and the explosion-proof valve body is picked up and thrown into the NG box. Wait for the main indexing plate mechanism to drive the top cover piece to move again to the explosion-proof valve body picking up, installing and smoothing mechanism to reinstall the explosion-proof valve body. S5: The main indexing plate mechanism drives the installed explosion-proof valve body and top cover to the welding mechanism for welding process operation until the welding is completed, completing the assembly of the product.

[0014] Beneficial effects of the invention: The present invention provides a system and method for welding an explosion-proof valve body and a top cover sheet. The system structure is relatively compact, the installation position of the explosion-proof valve body is accurate and flat, and the welding quality and welding efficiency of the explosion-proof valve body and the top cover sheet are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a schematic diagram of the assembly structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the top view of the main indexing plate mechanism of the present invention.

[0017] Figure 3 It is a schematic diagram of the main structure of the main indexing plate mechanism of the present invention.

[0018] Figure 4 It is a schematic structural diagram of the magazine mechanism of the present invention.

[0019] Figure 5 It is a schematic diagram of the structure of the explosion-proof valve body installation body of the present invention.

[0020] Figure 6 It is a structural schematic diagram of the explosion-proof valve body picking-up, installation and smoothing mechanism of the present invention.

[0021] Figure 7 It is a structural schematic diagram of the welding mechanism of the present invention.

[0022] In the figure: 1. Frame; 2. Main indexing plate mechanism; 21. Main indexing plate; 211. Fixture module; 212. Explosion-proof valve mounting slot; 22. Main indexing plate drive motor; 3. Explosion-proof valve body picking, installation and smoothing mechanism; 31. First transplanting Y-axis module; 32. First transplanting X-axis module; 33. First transplanting Z-axis module; 34. First rotating R-axis module; 35. Suction nozzle; 36. Z-phase cylinder; 37. Conductive carbon nanotube sponge; 38. Smoothing plate; 39. Visual inspection unit; 4. Magazine mechanism; 41. Lifting unit; 411. Lifting drive device; 41 2. Lifting plate; 413. Lifting rod; 42. Magazine unit; 421. Mounting plate; 422. Explosion-proof valve body mounting body; 423. Limiting column; 424. Explosion-proof valve body mounting groove; 43. Rotating unit; 44. Material presence detection sensor; 5. Welding mechanism; 51. Second transplanting Y-axis module; 52. Second transplanting X-axis module; 53. Second transplanting Z-axis module; 54. Pulse laser welding device; 55. Welding mechanism column; 6. Negative pressure detection mechanism; 61. Vacuum suction hole; 62. Vacuum filter; 63. Vacuum pump; 64. Vacuum detection gauge. DETAILED DESCRIPTION

[0023] A welding system for explosion-proof valve body and top cover, the assembly structure diagram is as follows Figure 1As shown, it includes a frame 1 and a main indexing plate mechanism 2 installed on the frame, an explosion-proof valve body picking, installing and smoothing mechanism 3, a welding mechanism 5 and a magazine mechanism 4. The main indexing plate mechanism is evenly provided with four groups of jig modules corresponding to the four workstations of the system. At the first workstation of the system, the top cover piece is placed on the jig module of the main indexing plate mechanism. The explosion-proof valve body picking, installing and smoothing mechanism and the magazine mechanism are arranged at the second workstation of the system. The explosion-proof valve body picking, installing and smoothing mechanism is used to pick up the explosion-proof valve body placed in the magazine mechanism and perform gradual vibration to ensure that one explosion-proof valve body is picked up at a time, and after visual positioning and angle compensation of the explosion-proof valve body, the explosion-proof valve body is installed in the notch of the top cover piece of the jig module, and the explosion-proof valve body is hard-smoothed. The welding mechanism is arranged at the third workstation of the system, and is used to weld the smoothed explosion-proof valve body to the top cover piece. The welded product is taken away at the fourth workstation of the system.

[0024] The main indexing plate mechanism is evenly equipped with four sets of fixture modules corresponding to the four workstations of the system. In this way, the four workstations surround the main indexing plate mechanism and can operate at the same time, which has a relatively high production efficiency.

[0025] The explosion-proof valve body pick-up and smoothing mechanism removes the explosion-proof valve body from the magazine mechanism and then performs a gradual vibration. Specifically, the vibration amplitude can be parabolic, with the difference between the starting amplitude, the stopping amplitude, and the peak amplitude being approximately 2 mm, and the vibration frequency within one cycle being 3 times. This can break the critical displacement of static friction, effectively eliminating electrostatic adsorption on the explosion-proof valve body and ensuring that the nozzle only picks up one explosion-proof valve body at a time and installs it into the notch of the top cover of the fixture module.

[0026] Visual positioning and angle compensation of the explosion-proof valve body can ensure that the installation position of the explosion-proof valve body is relatively accurate.

[0027] Hard smoothing of the explosion-proof valve body can ensure the flatness of the explosion-proof valve body, thereby ensuring the contact area between the explosion-proof valve body and the top cover piece, thereby ensuring the welding quality between the explosion-proof valve body and the top cover piece.

[0028] Furthermore, the main indexing plate structure diagram is as follows Figure 2 、 Figure 3 As shown, it includes a main indexing plate 21 and a main indexing plate driving motor 22. The main indexing plate is driven to rotate by the main indexing plate driving motor. Four groups of fixture modules 211 are evenly arranged on the main indexing plate. Each group of fixture modules is provided with an explosion-proof valve mounting groove 212. The explosion-proof valve mounting groove is provided with a vacuum suction hole 61. The explosion-proof valve mounting groove is used to place the top cover piece and the explosion-proof valve body.

[0029] The main indexing plate drive motor drives the main indexing plate to rotate, so that the fixture module can move to the corresponding work station.

[0030] Optimized, there are two explosion-proof valve installation slots, so that the main indexing plate mechanism can simultaneously transfer and assemble two explosion-proof valves when it runs one circle, further improving production efficiency.

[0031] Furthermore, a negative pressure detection mechanism 6 is provided on the fixture module, and the negative pressure detection mechanism includes a vacuum pump 63 and a negative pressure detection pipeline (not shown). The negative pressure detection pipeline is connected between the vacuum pump and the vacuum suction hole of the explosion-proof valve installation groove. A vacuum detection header 64 and a vacuum filter 62 are installed on the negative pressure detection pipeline. The vacuum detection header is connected to the PLC through a signal line.

[0032] After the explosion-proof valve body is installed in place and hard smoothed, negative pressure testing can be carried out. After the negative pressure device passes the test, the main indexing plate mechanism will transfer the installed explosion-proof valve body and top cover piece to the next workstation.

[0033] Specifically, it can be detected through the vacuum detection head, and the negative pressure value can be fed back to the PLC. The PLC compares the negative pressure value with the set threshold. If the negative pressure value is greater than or equal to the set threshold, it means that the explosion-proof valve body is installed in place and enters the next workstation. If the negative pressure value is less than the set threshold, it means that the explosion-proof valve body is not installed in place, then the explosion-proof valve body will be picked up and thrown into the NG box, and the main dividing plate mechanism will drive the top cover piece to run again to the explosion-proof valve body picking up and installing and smoothing mechanism to reinstall the explosion-proof valve body.

[0034] Setting up a vacuum filter can prevent dust and other substances from entering, further ensuring the quality of the explosion-proof valve.

[0035] Further, the schematic diagram of the magazine mechanism structure is as follows Figure 4 As shown, it includes a lifting unit 41, a magazine unit 42 and a rotating unit 43. The magazine unit includes a mounting plate 421 and an explosion-proof valve body mounting body 422 fixedly mounted on the mounting plate. The structural diagram of the explosion-proof valve body mounting body is shown in FIG. Figure 5 As shown, it is a cube structure, and two groups of limiting columns 423 are fixed on the side of each cube, and an explosion-proof valve body mounting groove 424 is provided between each group of limiting columns. The rotating unit drives the mounting plate to rotate, and the lifting unit includes a lifting drive device 411, a lifting plate 412 and a lifting rod 413. The lifting drive device drives the lifting plate to move up and down. The lifting rods are two horizontally fixedly installed on the lifting plate, and the ends of the two lifting rods extend into the corresponding explosion-proof valve body mounting grooves.

[0036] A stack of explosion-proof valve bodies can be placed in each explosion-proof valve body installation groove. When the explosion-proof valve body needs to be picked up, the jacking drive device drives the jacking plate to move upward, so that the jacking rod reaches the explosion-proof valve body installation groove position. As the jacking plate continues to move upward, the two jacking rods push the two stacks of explosion-proof valve bodies upward to the corresponding positions at the same time, and the explosion-proof valve body picking and installation smoothing mechanism can pick up the top two explosion-proof valve bodies at the same time.

[0037] Optimized, the magazine mechanism also includes a material presence detection sensor 44, which is installed on the top of the explosion-proof valve body mounting body. The material presence detection sensor is connected to the PLC through a signal line, and the PLC controls the operation of the lifting unit, the rotating unit and the explosion-proof valve body picking up, installing and smoothing mechanism.

[0038] When the material presence detection sensor detects the presence of an explosion-proof valve body, the PLC controls the lifting unit to stop running and controls the explosion-proof valve body picking up and installing the smoothing mechanism to pick up the explosion-proof valve body. When the lifting unit runs to the top and the material presence detection sensor still cannot detect the explosion-proof valve body, it means that there is no explosion-proof valve body in the explosion-proof valve body installation groove. The PLC then controls the rotation unit to operate, driving the magazine unit to rotate so that the explosion-proof valve body installation groove on the other side of the explosion-proof valve body installation body is aligned with the lifting rod, achieving normal material feeding.

[0039] Furthermore, the schematic diagram of the explosion-proof valve body picking up, installing and smoothing mechanism is as follows: Figure 6 As shown, it includes a first transplanting X-axis module 32, a first transplanting Y-axis module 31, a first transplanting Z-axis module 33, a first rotating R-axis module 34, a suction nozzle 35, a Z-phase cylinder 36 and a visual inspection unit 39. The first transplanting Y-axis module is installed on the first transplanting X-axis module. The first transplanting Z-axis module, the first rotating R-axis module, the suction nozzle, the Z-phase cylinder and the visual inspection unit are all two sets. The first transplanting Z-axis module is installed on the first transplanting Y-axis module. The first rotating R-axis module, the Z-phase cylinder and the visual inspection unit are installed on the first transplanting Z-axis module. The suction nozzle is installed on the first rotating R-axis module. A smoothing plate 38 is fixedly installed at the end of the connecting rod of the Z-phase cylinder. A conductive carbon nanotube sponge 37 is fixedly installed on the smoothing plate. A clearance groove is opened in the middle of the conductive carbon nanotube sponge.

[0040] The first transplanting X-axis module, the first transplanting Y-axis module, and the first transplanting Z-axis module control the suction nozzle to run along the X-axis, Y-axis, and Z-axis to simultaneously pick up the two explosion-proof valve bodies lifted by the lifting unit. By controlling the first transplanting X-axis module and the first transplanting Y-axis module to run back and forth within the set range at the same time, the explosion-proof valve body can be gradually vibrated to ensure that a single explosion-proof valve body is picked up. Then the visual inspection unit performs visual positioning inspection on the explosion-proof valve body and feeds back the rotation angle compensation value to the PLC, which controls the first rotation The R-axis module drives the explosion-proof valve body to rotate for angle compensation and then places the explosion-proof valve body into the notch of the top cover piece in the explosion-proof valve installation groove. The Z-phase cylinder connecting rod moves downward, and the explosion-proof valve body is pressed down and maintained under pressure for a period of time through the conductive carbon nanotube sponge to eliminate residual stress. The duration is about 1 second. Then, under the positioning control of the first transplanting X-axis module and the first transplanting Y-axis module in sequence, the explosion-proof valve body is hard-smoothed in the front, back, left and right directions in turn to ensure the flatness of the explosion-proof valve body, and enters the next workstation after passing the negative pressure test.

[0041] Setting up a set of Z-phase cylinders can realize the smoothing of two explosion-proof valve bodies at the same time. Setting up the conductive carbon nanotube sponge is helpful to eliminate the residual stress of the explosion-proof valve body, smooth the explosion-proof valve body, and prevent the explosion-proof valve body from being damaged during the hard smoothing process.

[0042] Optimized, the nozzle is a non-metallic flexible nozzle. The use of non-metallic flexible nozzle can reduce the poor adhesion effect caused by the different heights of the product surface and the electrostatic discharge phenomenon of the explosion-proof valve body.

[0043] Further, the schematic diagram of the welding mechanism is as follows Figure 7 As shown, it includes a welding mechanism column 55, a second transplanting X-axis module 52, a second transplanting Y-axis module 51, a second transplanting Z-axis module 53 and a pulse laser welding device 54. The second transplanting Y-axis module is fixedly mounted on the welding mechanism column, the second transplanting X-axis module is mounted on the second transplanting Y-axis module, the second transplanting Y-axis module drives the second transplanting X-axis module to move along the Y-axis, the second transplanting Z-axis module is mounted on the second transplanting X-axis module, the second transplanting X-axis module drives the second transplanting Z-axis module to move along the X-axis, the pulse laser welding device is mounted on the second transplanting Z-axis module, and the second transplanting Z-axis module drives the pulse laser welding device to move along the Z-axis.

[0044] The second transplanting X-axis module, the second transplanting Y-axis module, and the second transplanting Z-axis module can drive the pulse laser welding device to run along the X-axis, Y-axis, and Z-axis to perform all-round welding on the explosion-proof valve body and the top cover.

[0045] The pulsed laser welder uses a pulsed laser to perform symmetrical spot welds at planned locations. The energy per spot is 5 to 10 joules. The laser power is adjustable, and the number of spot welds is determined by the thermal deformation of the explosion-proof valve body and the top cover. Four spot welds are preferred, arranged symmetrically in a cross pattern. A continuous laser is then used to fill in the spot weld path. The code weld power is 20-30 times the spot weld energy, and the scan path includes at least one overlapping reflow weld. The laser welder communicates with a PLC, offering high communication speeds and intuitive signal monitoring.

[0046] A method for welding an explosion-proof valve body and a top cover sheet, comprising the following steps: S1: Place the top cover piece in the explosion-proof valve installation groove of the main indexing plate mechanism. The main indexing plate mechanism drives the top cover piece to move to the explosion-proof valve body picking up and installing the smoothing mechanism; S2: The nozzle of the explosion-proof valve body picking-up and smoothing mechanism picks up the explosion-proof valve body from the magazine mechanism and performs gradual vibration on the picked explosion-proof valve body to ensure that the single-piece explosion-proof valve body is picked up. The explosion-proof valve body is then visually positioned and the rotation angle compensation value is fed back to the PLC. The PLC controls the explosion-proof valve body picking-up and smoothing mechanism to drive the explosion-proof valve body to rotate for angle compensation. S3: Place the explosion-proof valve body after angle compensation into the notch of the top cover in the explosion-proof valve installation groove, and press it into place using a Z-phase cylinder with conductive carbon nanotube sponge. Then, perform multi-directional hard smoothing on the explosion-proof valve body. S4: Perform negative pressure detection on the explosion-proof valve body and top cover, and feed back the negative pressure value to the PLC. The PLC compares the negative pressure value with the set threshold. If the negative pressure value is greater than or equal to the set threshold, it means that the explosion-proof valve body is installed in place, and proceed to the next step. If the negative pressure value is less than the set threshold, it means that the explosion-proof valve body is not installed in place, and the explosion-proof valve body is picked up and thrown into the NG box. Wait for the main indexing plate mechanism to drive the top cover piece to move again to the explosion-proof valve body picking up, installing and smoothing mechanism to reinstall the explosion-proof valve body. S5: The main indexing plate mechanism drives the installed explosion-proof valve body and top cover to the welding mechanism for welding process operation until the welding is completed, completing the assembly of the product.

[0047] By conducting helium testing on products welded using the system and method provided by the present invention, it was found that compared with products produced by traditional methods, the airtightness was improved by 1000 times, the product stability was greatly improved, and the welding deformation, weld strength and production efficiency were greatly improved. The specific test results are shown in Table 1: Table 1

[0048] To sum up, the present invention proposes a system and method for welding the explosion-proof valve body and the top cover sheet. The system structure is relatively compact, the installation position of the explosion-proof valve body is accurate and flat, and the welding quality and welding efficiency of the explosion-proof valve body and the top cover sheet are significantly improved.

[0049] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A welding system for an explosion-proof valve body and a top cover, characterized by: It includes a frame and a main indexing plate mechanism installed on the frame, an explosion-proof valve body picking, installing and smoothing mechanism, a welding mechanism and a magazine mechanism. The main indexing plate mechanism is evenly provided with four groups of jig modules corresponding to the four workstations of the system. At the first workstation of the system, the top cover piece is placed on the jig module of the main indexing plate mechanism. The explosion-proof valve body picking, installing and smoothing mechanism and the magazine mechanism are arranged at the second workstation of the system. The explosion-proof valve body picking, installing and smoothing mechanism is used to pick up the explosion-proof valve body placed in the magazine mechanism and perform gradual vibration to ensure that one explosion-proof valve body is picked up at a time, and after visual positioning and angle compensation of the explosion-proof valve body, the explosion-proof valve body is installed in the notch of the top cover piece in the jig module, and the explosion-proof valve body is hard-smoothed. The welding mechanism is arranged at the third workstation of the system, and is used to weld the smoothed explosion-proof valve body to the top cover piece. The welded product is taken away at the fourth workstation of the system.

2. The explosion-proof valve body and top cover welding system according to claim 1, characterized in that: The main indexing plate mechanism includes a main indexing plate and a main indexing plate drive motor. The main indexing plate is driven to rotate by the main indexing plate drive motor. Four groups of fixture modules are evenly arranged on the main indexing plate. Each group of fixture modules is provided with an explosion-proof valve mounting groove, and the explosion-proof valve mounting groove is provided with a vacuum suction hole.

3. The explosion-proof valve body and top cover welding system according to claim 2, characterized in that: There are two explosion-proof valve installation slots.

4. The explosion-proof valve body and top cover welding system according to claim 2, characterized in that: Each group of the fixture modules is provided with a negative pressure detection mechanism, which includes a vacuum pump and a negative pressure detection pipeline. The negative pressure detection pipeline is connected between the vacuum pump and the vacuum suction hole of the explosion-proof valve installation slot. A vacuum detection header and a vacuum filter are installed on the negative pressure detection pipeline. The vacuum detection header is connected to the PLC through a signal line.

5. The explosion-proof valve body and top cover welding system according to claim 1, characterized in that: The magazine mechanism includes a lifting unit, a magazine unit and a rotating unit. The magazine unit includes a mounting plate and an explosion-proof valve body mounting body fixedly installed on the mounting plate. The explosion-proof valve body mounting body is a cube structure, and two groups of limit columns are fixedly provided on the side of each cube. An explosion-proof valve body mounting groove is provided between each group of limit columns. The rotating unit drives the mounting plate to rotate. The lifting unit includes a lifting drive device, a lifting plate and a lifting rod. The lifting drive device drives the lifting plate to move up and down. The lifting rods are two horizontally fixedly installed on the lifting plate, and the ends of the two lifting rods extend into the corresponding explosion-proof valve body mounting grooves.

6. The explosion-proof valve body and top cover welding system according to claim 5, characterized in that: The magazine mechanism also includes a material presence detection sensor, which is installed on the top of the explosion-proof valve body mounting body. The material presence detection sensor is connected to the PLC through a signal line, and the PLC controls the operation of the jacking unit, the rotating unit and the explosion-proof valve body picking, installation and smoothing mechanism.

7. The explosion-proof valve body and top cover welding system according to claim 1, characterized in that: The explosion-proof valve body picking up, installing and smoothing mechanism includes a first transplanting X-axis module, a first transplanting Y-axis module, a first transplanting Z-axis module, a first rotating R-axis module, a suction nozzle, a Z-phase cylinder and a visual inspection unit. The first transplanting Y-axis module is installed on the first transplanting X-axis module. There are two sets of the first transplanting Z-axis module, the first rotating R-axis module, the suction nozzle and the visual inspection unit. The two first transplanting Z-axis modules are installed on the first transplanting Y-axis module. The two first rotating R-axis modules, the Z-phase cylinder and the visual inspection unit are all installed on the first transplanting Z-axis module. The two suction nozzles are installed on the first rotating R-axis module. A smoothing plate is fixedly installed on the end of the connecting rod of the Z-phase cylinder. A conductive carbon nanotube sponge is fixedly installed on the smoothing plate, and a makeshift groove is opened in the middle of the conductive carbon nanotube sponge.

8. The explosion-proof valve body and top cover welding system according to claim 7, characterized in that: The suction nozzle is a non-metallic flexible suction nozzle.

9. The explosion-proof valve body and top cover welding system according to claim 1, characterized in that: The welding mechanism includes a welding mechanism column, a second transplanting X-axis module, a second transplanting Y-axis module, a second transplanting Z-axis module and a pulse laser welding device. The second transplanting Y-axis module is fixedly installed on the welding mechanism column, the second transplanting X-axis module is installed on the second transplanting Y-axis module, the second transplanting Y-axis module drives the second transplanting X-axis module to move along the Y-axis, the second transplanting Z-axis module is installed on the second transplanting X-axis module, the second transplanting X-axis module drives the second transplanting Z-axis module to move along the X-axis, and the pulse laser welding device is installed on the second transplanting Z-axis module, and the second transplanting Z-axis module drives the pulse laser welding device to move along the Z-axis.

10. A method for welding an explosion-proof valve body and a top cover, characterized in that: The steps include: S1: Place the top cover piece in the explosion-proof valve installation groove of the main indexing plate mechanism. The main indexing plate mechanism drives the top cover piece to move to the explosion-proof valve body picking up and installing the smoothing mechanism; S2: The nozzle of the explosion-proof valve body picking-up and smoothing mechanism picks up the explosion-proof valve body from the magazine mechanism and performs gradual vibration on the picked explosion-proof valve body to ensure that the single-piece explosion-proof valve body is picked up. The explosion-proof valve body is then visually positioned and the rotation angle compensation value is fed back to the PLC. The PLC controls the explosion-proof valve body picking-up and smoothing mechanism to drive the explosion-proof valve body to rotate for angle compensation. S3: Place the explosion-proof valve body after angle compensation into the notch of the top cover in the installation groove of the explosion-proof valve, and press it into place by a Z-phase cylinder with conductive carbon nanotube sponge, and then perform multi-directional hard smoothing on the explosion-proof valve body; S4: Perform negative pressure detection on the explosion-proof valve body and top cover, and feed back the negative pressure value to the PLC. The PLC compares the negative pressure value with the set threshold. If the negative pressure value is greater than or equal to the set threshold, it means that the explosion-proof valve body is installed in place, and proceed to the next step. If the negative pressure value is less than the set threshold, it means that the explosion-proof valve body is not installed in place, and the explosion-proof valve body is picked up and thrown into the NG box. Wait for the main indexing plate mechanism to drive the top cover piece to move again to the explosion-proof valve body picking up, installing and smoothing mechanism to reinstall the explosion-proof valve body. S5: The main indexing plate mechanism drives the installed explosion-proof valve body and top cover to the welding mechanism for welding process operation until the welding is completed, completing the assembly of the product.

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