Butt-welding equipment for valve

Abstract

The invention belongs to the technical field of valve welding, and particularly relates to butt-welding equipment for valves, which comprises a welding machine table and a support frame mounted on the end face of the welding machine table, an electric hydraulic cylinder is mounted on the end face of the support frame, a mounting cover is mounted at the telescopic end of the electric hydraulic cylinder, and a resistance welding ring is mounted on the inner wall of the mounting cover. A controller is installed on the side wall of the supporting frame, and the electric hydraulic cylinder and the resistance welding ring are both electrically connected with the controller. Stable contact between the resistance welding block and the inner wall of the shaft sleeve can be guaranteed, stable passing of resistance welding current is guaranteed, the service life of a resistance welding connector is prolonged, the butt-welding efficiency is improved, and the situation that the fusion part of the shaft sleeve permeates into the inner wall of a valve body mounting hole to affect valve rod mounting can be avoided; and personnel can be reminded to replace the abraded resistance welding block in time.

Description

Technical Field

[0001] The invention belongs to the technical field of valve welding, and in particular relates to a butt welding device for valves. Background Art

[0002] In valve manufacturing, welding quality has a significant impact on the sealing, strength and service life of the valve. Butt welding is widely used in valve manufacturing, such as the connection between the sleeve and the valve body, the handle and the valve stem, the valve disc and the pin shaft, etc. It can achieve fast and accurate welding, effectively ensure the stability of the connection between components, and improve the overall performance and reliability of the valve. While improving production efficiency, it reduces the probability of valve failure due to connection problems.

[0003] At present, in the welding operation of valve body and sleeve, butt welding is widely used due to its significant advantages. For example, the butt welding equipment for valves disclosed in patent announcement number CN118492591B uses the lower resistance welding head to pass through the valve body mounting hole and set the sleeve, and cooperates with the upper resistance welding head to efficiently complete the butt welding work of the sleeve and the valve body, greatly improving the welding stability and convenience; however, in actual use, the lower resistance welding head needs to fit tightly with the inner wall of the sleeve to achieve current conduction heating welding, but the resistance welding head and the sleeve need to be frequently plugged in and out, and the high heat generated during welding makes the welding head extremely easy to wear. A gap will appear between the worn welding head and the sleeve, which seriously hinders the normal passage of current, and then has a negative impact on the welding work. If the resistance welding head is frequently replaced, it will not only cause a large amount of waste of the welding head, but also greatly reduce the valve processing efficiency. In view of this, in order to effectively solve the above problems, we specially propose a butt welding equipment for valves. Summary of the invention

[0004] The object of the present invention is to provide a valve butt welding device in view of the above problems.

[0005] To achieve the above object, the present invention adopts the following technical scheme: a valve welding device, comprising a welding machine and a support frame installed on the end face of the welding machine, an electric hydraulic cylinder is installed on the end face of the support frame, a mounting cover is installed on the telescopic end of the electric hydraulic cylinder, a resistance welding ring is installed on the inner wall of the mounting cover, a controller is installed on the side wall of the support frame, the electric hydraulic cylinder and the resistance welding ring are both electrically connected to the controller, and further comprising:

[0006] The insulating column is arranged on the inner side of the resistance welding ring and is coaxial with the resistance welding ring. The mounting cover is provided with a driving mechanism, and the driving mechanism is used to drive the insulating column to rotate at a constant speed.

[0007] A plurality of arc-shaped resistance welding blocks are evenly distributed in an annular shape on the outside of the insulating column. A circular groove is provided at the bottom of the insulating column, and the circular groove is connected to a plurality of pressing mechanisms, each of which is used to apply a pressing force to the arc-shaped resistance welding block on the same side in a direction away from the insulating column. A central hole is provided on the upper groove wall of the circular groove, and a conductive component is installed at the notch of the circular groove, the conductive component is used to seal the circular groove, and the conductive component is electrically connected to each arc-shaped resistance welding block;

[0008] The air supply unit is installed on the side wall of the support frame, and the air supply unit is connected with the central hole.

[0009] Preferably, the driving mechanism includes a support sleeve fixedly mounted on the inner wall of the top of the mounting cover, the inner wall of the support sleeve is rotatably connected to an insulating plate through a sealed bearing, the insulating plate is fixedly connected to the top of the insulating column, a gear sleeve is fixedly sleeved on the upper end of the side wall of the insulating column, a driving motor is fixedly mounted on the top of the mounting cover, and the output shaft of the driving motor is rotatably connected to the top of the mounting cover, the output shaft of the driving motor is installed with a moving gear, and the moving gear is meshed with the gear sleeve, and the driving motor is electrically connected to the controller.

[0010] Preferably, each of the pressing mechanisms includes a glass fiber reinforced plastic sleeve fixedly inserted at the lower end of the side wall of the insulating column, and the glass fiber reinforced plastic sleeve is connected to the interior of the circular groove, a piston is slidably connected to the interior of the glass fiber reinforced plastic sleeve, a connecting column is fixedly installed on the side wall of the piston, an insulating mounting column is installed on the inner arc surface of the arc-shaped resistance welding block, and the insulating mounting column is detachably connected to the insulating column, and a spring is arranged between the piston and the inner wall of the glass fiber reinforced plastic sleeve.

[0011] Preferably, the conductive component includes an insulating sealing block installed at the notch of the circular groove, and the insulating sealing block seals the notch of the circular groove, a main conductive block is fixedly installed on the bottom of the insulating sealing block, a plurality of arc-shaped conductive blocks are evenly distributed in an outer ring shape on the main conductive block, and the bottom of each arc-shaped resistance welding block is in sliding contact with the top of the arc-shaped conductive block on the same side, a conductive column is fixedly arranged between each arc-shaped conductive block and the main conductive block, a conductive shaft is installed on the end face of the main conductive block, and the top of the conductive shaft passes through the center hole and is fixedly connected to a rotary joint, the top of the rotary joint passes through the insulating plate, and the rotary joint is electrically connected to the controller.

[0012] Preferably, the air supply unit includes an air pump fixedly mounted on the side wall of the support frame, the air outlet end of the air pump is fixedly connected to a connecting hose, the end face of the mounting cover is fixedly plugged with an air supply rigid pipe, and the air supply rigid pipe is connected to the connecting hose, the air supply rigid pipe is connected to the interior of the support sleeve, the end face of the insulating plate is provided with a plurality of connecting holes connected to the center hole, the air pump is electrically connected to the controller, and the air supply unit is equipped with a heat dissipation assembly.

[0013] Preferably, the heat dissipation assembly includes a shunt pipe fixedly plugged into the end face of the mounting cover, and the shunt pipe is connected to the air supply rigid pipe, the air outlet end of the shunt pipe is arranged on the outside of the support sleeve, a normally closed solenoid valve is installed inside the shunt pipe, and a normally open solenoid valve is installed inside the air supply rigid pipe near the air outlet end, and both the normally closed solenoid valve and the normally open solenoid valve are electrically connected to the controller.

[0014] Preferably, an air pressure detector is fixedly plugged into the side wall of the support sleeve, and a detection end of the air pressure detector is arranged on the inner side of the support sleeve, and the air pressure detector is electrically connected to the controller.

[0015] Preferably, a timer is fixedly mounted on the top inner wall of the mounting cover, and the timer is arranged on the inner side of the supporting sleeve, and the timer is electrically connected to the controller.

[0016] Compared with the existing technology, the advantages of a valve welding device are:

[0017] 1. Through the cooperation of the welding machine, support clamp, electric hydraulic cylinder, mounting cover, resistance welding ring, controller, insulating column, driving mechanism, multiple arc-shaped resistance welding blocks, circular groove, top pressure mechanism, center hole and conductive components, the resistance welding head on the lower side is designed as multiple arc-shaped resistance welding blocks, and it can be moved relative to the sleeve, so as to ensure that it is in stable contact with the inner wall of the sleeve, ensure that the resistance welding current can pass stably, reduce the impact of wear on the resistance welding block, extend the service life of the resistance welding head, reduce the replacement frequency, and indirectly improve the welding efficiency. Secondly, the rotation of multiple arc-shaped resistance welding blocks can avoid the phenomenon that the molten part of the sleeve penetrates into the inner wall of the valve body mounting hole as much as possible, thereby avoiding the molten seepage part affecting the installation of the valve stem.

[0018] 2. The air supply unit can not only supply air to each top pressure mechanism, but also cooperate with the heat dissipation component to quickly reduce the heat at the arc resistance welding block and the resistance welding ring after a single butt welding contact, so as to avoid heat accumulation and aggravate the deformation of the arc resistance welding block and the resistance welding ring.

[0019] 3. Through the set air pressure detector, it is convenient to determine whether the top pressure of each top pressure mechanism is in place, and in conjunction with the set timer, the wear degree of the arc resistance welding block can be judged based on the time required for air supply, so that personnel can be reminded to replace the arc resistance welding block in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a valve butt welding device provided by the present invention;

[0021] Figure 2 It is a schematic diagram of the internal structure of a mounting cover of a valve butt welding device provided by the present invention;

[0022] Figure 3 It is a schematic diagram of the internal structure of a circular groove of a valve butt welding device provided by the present invention;

[0023] Figure 4 It is a schematic diagram of the top view structure of multiple arc-shaped resistance welding blocks of a valve butt welding device provided by the present invention;

[0024] Figure 5 It is a schematic diagram of the connection structure of multiple arc-shaped conductive blocks and a main conductive block of a valve welding device provided by the present invention;

[0025] Figure 6 The present invention provides a valve butt welding device Figure 1 A magnified view of the structure of part A.

[0026] In the figure: 1 welding machine, 2 support frame, 3 electric hydraulic cylinder, 4 mounting cover, 5 resistance welding ring, 6 controller, 7 insulating column, 8 driving mechanism, 81 supporting sleeve, 82 insulating plate, 83 gear sleeve, 84 driving motor, 85 moving gear, 9 arc resistance welding block, 10 round groove, 11 pressing mechanism, 111 glass fiber reinforced plastic sleeve, 112 piston, 113 connecting column, 114 insulating mounting column, 115 spring, 12 center hole, 13 conductive component, 131 insulating blocking block, 132 main conductive block, 133 arc conductive block, 134 conductive column, 135 rotary joint, 136 conductive shaft, 14 air supply unit, 141 air pump, 142 connecting hose, 143 air supply hard pipe, 144 connecting hole, 15 heat dissipation component, 151 shunt pipe, 152 normally closed solenoid valve, 153 normally open solenoid valve, 16 air pressure detector, 17 timer. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] like Figure 1-Figure 6As shown, a butt welding device for valves includes a welding machine 1 and a support frame 2 installed on the end face of the welding machine 1, an electric hydraulic cylinder 3 is installed on the end face of the support frame 2, a mounting cover 4 is installed on the telescopic end of the electric hydraulic cylinder 3, a resistance welding ring 5 is installed on the inner wall of the mounting cover 4, a controller 6 is installed on the side wall of the support frame 2, the electric hydraulic cylinder 3 and the resistance welding ring 5 are both electrically connected to the controller 6, and also includes: an insulating column 7, the insulating column 7 is arranged on the inner side of the resistance welding ring 5 and keeps coaxial with the resistance welding ring 5, the mounting cover 4 is installed with a driving mechanism 8, and the driving mechanism 8 is used to drive the insulating column 7. The column 7 rotates at a constant speed, and the driving mechanism 8 includes a supporting sleeve 81 fixedly mounted on the inner wall of the top of the mounting cover 4. The inner wall of the supporting sleeve 81 is rotatably connected to an insulating plate 82 through a sealed bearing. The insulating plate 82 is fixedly connected to the top of the insulating column 7. A gear sleeve 83 is fixedly sleeved on the upper end of the side wall of the insulating column 7. A driving motor 84 is fixedly mounted on the top of the mounting cover 4, and the output shaft of the driving motor 84 is rotatably connected to the top of the mounting cover 4. A moving gear 85 is installed on the output shaft of the driving motor 84, and the moving gear 85 is meshed with the gear sleeve 83. The driving motor 84 is electrically connected to the controller 6.

[0029] A plurality of arc-shaped resistance welding blocks 9 are evenly distributed in a ring shape on the outside of the insulating column 7. A circular groove 10 is provided at the bottom of the insulating column 7, and the circular groove 10 is connected to a plurality of pressing mechanisms 11. Each pressing mechanism 11 is used to apply a pressing force to the arc-shaped resistance welding block 9 on the same side in a direction away from the insulating column 7. Each pressing mechanism 11 includes a glass fiber reinforced plastic sleeve 111 fixedly plugged into the lower end of the side wall of the insulating column 7, and the glass fiber reinforced plastic sleeve 111 is connected to the inside of the circular groove 10. A piston 112 is slidably connected to the inside of the glass fiber reinforced plastic sleeve 111, and a connecting column 113 is fixedly installed on the side wall of the piston 112. An insulating mounting column 114 is installed on the inner arc surface of the arc-shaped resistance welding block 9, and the insulating mounting column 114 is detachably connected to the insulating column 7. A spring 115 is provided between the piston 112 and the inner wall of the glass fiber reinforced plastic sleeve 111. The spring 115 can reset the piston 112 after the air pressure inside the circular groove 10 returns to normal pressure.

[0030] A central hole 12 is provided on the upper groove wall of the circular groove 10, and a conductive component 13 is installed at the notch of the circular groove 10. The conductive component 13 is used to seal the circular groove 10, and the conductive component 13 is electrically connected to each arc-shaped resistance welding block 9. The conductive component 13 includes an insulating blocking block 131 installed at the notch of the circular groove 10, and the insulating blocking block 131 seals the notch of the circular groove 10. A main conductive block 132 is fixedly installed at the bottom of the insulating blocking block 131, and a plurality of arc-shaped conductive blocks 133 are evenly distributed on the outer side of the main conductive block 132. The bottom of each arc-shaped resistance welding block 9 is fixedly installed at the bottom of the insulating blocking block 131. The arc-shaped conductive blocks 133 on the same side are all in sliding contact with the top of the arc-shaped conductive block 133, and a conductive column 134 is fixedly arranged between each arc-shaped conductive block 133 and the main conductive block 132. A conductive shaft 136 is installed on the end surface of the main conductive block 132, and the top of the conductive shaft 136 passes through the center hole 12 and is fixedly connected to a rotary joint 135. The top of the rotary joint 135 passes through the insulating plate 82, and the rotary joint 135 is electrically connected to the controller 6. The external power supply system is electrically connected to the rotary joint 135 through the controller 6 and the rotary plug, that is, the rotary joint 135 and the rotary plug can rotate relative to each other.

[0031] The air supply unit 14 is installed on the side wall of the support frame 2, and the air supply unit 14 is connected to the center hole 12. The air supply unit 14 includes an air pump 141 fixedly installed on the side wall of the support frame 2, and the air outlet end of the air pump 141 is fixedly connected to a connecting hose 142. The end surface of the mounting cover 4 is fixedly plugged with an air supply hard pipe 143, and the air supply hard pipe 143 is connected to the connecting hose 142. The air supply hard pipe 143 is connected to the inside of the support sleeve 81, and the end surface of the insulating plate 82 is provided with a plurality of connecting holes 144 connected to the center hole 12. The air pump 1 41 is electrically connected to the controller 6, the air supply unit 14 is equipped with a heat dissipation assembly 15, the heat dissipation assembly 15 includes a shunt pipe 151 fixedly plugged into the end face of the mounting cover 4, and the shunt pipe 151 is communicated with the air supply hard pipe 143, the air outlet end of the shunt pipe 151 is arranged on the outside of the support sleeve 81, a normally closed solenoid valve 152 is installed inside the shunt pipe 151, and a normally open solenoid valve 153 is installed inside the air supply hard pipe 143 near the air outlet end, and both the normally closed solenoid valve 152 and the normally open solenoid valve 153 are electrically connected to the controller 6.

[0032] An air pressure detector 16 is fixedly connected to the side wall of the support sleeve 81, and the detection end of the air pressure detector 16 is arranged on the inner side of the support sleeve 81. The air pressure detector 16 is electrically connected to the controller 6. The air pressure detector 16 can feed back an electrical signal to the controller 6 after the air pressure reaches a set value.

[0033] A timer 17 is fixedly mounted on the top inner wall of the mounting cover 4 and is disposed on the inner side of the support sleeve 81 . The timer 17 is electrically connected to the controller 6 . The timer 17 can feed back an electrical signal to the controller 6 after the timing reaches a set time.

[0034] The operating principle of the present invention is described as follows: the valve body to be welded is mounted on the welding machine 1 (a positioning mold frame is mounted on the welding machine 1, and the positioning mold frame is used to position and support the valve body), and the shaft sleeve hole of the valve body is coaxial with the insulating column 7 and is located at the top of the valve body, and then the shaft sleeve is inserted upward from the bottom of the insulating column 7 to the outside of each arc-shaped resistance welding block 9 (refer to Figure 1 , Figure 1 The dotted line portion is the shaft sleeve, and the dotted arrow is the installation direction of the shaft sleeve. The shaft sleeve is also automatically installed according to the program by an external automatic manipulator or other equipment). After the shaft sleeve is inserted into the outer side of the insulating column 7, the controller 6 will immediately control the air pump 141 to start working. The air pump 141 supplies air to the inside of the support sleeve 81 through the connecting hose 142 and the air supply hard pipe 143. The air flow then enters the center hole 12 through the connecting hole 144, and enters the circular groove 10 through the center hole 12. The air flow entering the circular groove 10 will enter the interior of each glass fiber reinforced plastic sleeve 111. As the air pressure inside the glass fiber reinforced plastic sleeve 111 increases, In addition, each piston 112 will drive the arc-shaped resistance welding block 9 to move away from the insulating column 7 through the connecting column 113 and the insulating mounting column 114. When the arc-shaped resistance welding block 9 abuts against the inner wall of the sleeve, each arc-shaped resistance welding block 9 stops moving. At this time, each piston 112 cannot move either. Therefore, the internal air pressure of the circular groove 10, the center hole 12, and the support sleeve 81 will increase rapidly. When the air pressure is higher than 0.5 atmospheres, the air pressure detector 16 will feedback an electrical signal to the controller 6. At this time, the controller 6 will control the air pump 141 to stop working, and control the normally open solenoid valve 153 to be energized and closed;

[0035] Subsequently, the controller 6 controls the electric hydraulic cylinder 3 to start extending, and the electric hydraulic cylinder 3 will drive the mounting cover 4 to drive the sleeve to move downward. After the sleeve abuts against the top of the valve body, the controller 6 will control the electric hydraulic cylinder 3 to stop working (a pressure sensor is arranged between the telescopic end of the electric hydraulic cylinder 3 and the mounting cover 4. The pressure sensor is used to detect the pressure applied by the electric hydraulic cylinder 3 to the mounting cover 4. When the pressure reaches a threshold, the pressure sensor feeds back an electrical signal to the controller 6, and the controller 6 controls the electric hydraulic cylinder 3 to stop working. The pressure threshold is determined based on the size and material of the sleeve, such as copper, aluminum or steel sleeve. When the outer diameter of the sleeve is When the diameter is 20mm-50mm and the thickness is 3mm-10mm, the welding pressure applied from the top of the sleeve during butt welding is usually between 500N-2000N), and then the controller 6 can control the power supply system to supply power to the resistance welding ring 5. The current at the resistance welding ring 5 is introduced into each arc resistance welding block 9 through the sleeve, and then flows back to the negative terminal of the power supply system through the arc conductive block 133, the conductive column 134, the main conductive block 132, the conductive shaft 136 and the rotary joint 135. When the current passes through the connection between the sleeve and the valve body, due to the resistance effect, the bottom of the sleeve heats up and melts, thereby starting to connect with the valve body;

[0036] Secondly, when the controller 6 supplies power to the resistance welding ring 5, the controller 6 will also control the driving motor 84 to start working. The driving motor 84 will drive the insulating column 7 to rotate through the moving gear 85 and the gear sleeve 83, and the insulating column 7 will drive each arc-shaped resistance welding block 9 to rotate synchronously, so that it rotates at a uniform speed along the inner wall of the sleeve, thereby ensuring that each arc-shaped resistance welding block 9 can evenly contact the annular inner wall of the sleeve to achieve uniform welding of the sleeve, and in the process of rotation, it can squeeze the molten part of the sleeve to prevent it from penetrating into the valve body mounting hole, so as to avoid affecting the subsequent valve stem installation. After the driving motor 84 works for 10 seconds, the rotation angle of each arc-shaped resistance welding block 9 is 720°. At this time, the controller 6 controls the external power supply system to stop supplying power to the resistance welding ring 5;

[0037] Subsequently, the controller 6 controls the air pump 141 to resume operation, and controls the normally closed solenoid valve 152 to be powered on and opened. At this time, the air pump 141 will supply air to the inner side of the mounting cover 4 through the air supply hard pipe 143 and the shunt pipe 151. The airflow will pass through the inside of the resistance welding ring 5 and the sleeve, and finally be discharged from each arc-shaped resistance welding block 9. Under the action of the airflow, the heat at the resistance welding ring 5, the sleeve, and the arc-shaped resistance welding block 9 will be rapidly reduced. On the one hand, the stability between the sleeve and the valve body after welding can be ensured. On the other hand, excessive heat accumulation at the resistance welding ring 5 and the arc-shaped resistance welding block 9 can be avoided, which may cause excessive deformation and wear during subsequent welding. After the normally closed solenoid valve 152 has been working for 1 minute, the controller 6 controls the air pump 141 to stop working, and controls the normally closed solenoid valve 152 and the normally open solenoid valve 153 to be powered off. At this time, the excess air in the circular groove 10 flows back to the air pump 141 to be discharged, and under the action of the spring 115, each piston 112 moves back and resets, so that a certain gap is maintained between the arc-shaped resistor welding block 9 and the inner wall of the sleeve, which facilitates the separation between the sleeve and the arc-shaped resistor welding block 9 and avoids aggravating the wear of the arc-shaped resistor welding block 9 during close plugging and unplugging. Subsequently, the controller 6 controls the electric hydraulic cylinder 3 to return and reset, and after the welded valve body is removed, the welding of the next valve body and the sleeve can be started;

[0038] Among them, before welding the valve body, when the controller 6 controls the air pump 141 to inflate the circular groove 10, the controller 6 will also control the timer 17 to start working. When the timer 17 reaches the set time, the timer 17 will feedback an electrical signal to the controller 6. At this time, if the controller 6 does not receive the electrical signal feedback from the air pressure detector 16, it means that the displacement of the arc resistance welding block 9 is too large, indicating that the arc resistance welding block 9 is excessively worn. At this time, the arc resistance welding block 9 should be replaced in time, and check whether the resistance welding ring 5 needs to be replaced (the setting time of the timer 17 is set based on the diameter of the sleeve).

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A butt welding device for valves, comprising a welding machine (1) and a support frame (2) mounted on the end face of the welding machine (1), an electric hydraulic cylinder (3) being mounted on the end face of the support frame (2), a mounting cover (4) being mounted on the telescopic end of the electric hydraulic cylinder (3), a resistance welding ring (5) being mounted on the inner wall of the mounting cover (4), a controller (6) being mounted on the side wall of the support frame (2), the electric hydraulic cylinder (3) and the resistance welding ring (5) being electrically connected to the controller (6), characterized in that: Also includes: The insulating column (7) is arranged on the inner side of the resistance welding ring (5) and is coaxial with the resistance welding ring (5). The mounting cover (4) is provided with a driving mechanism (8), and the driving mechanism (8) is used to drive the insulating column (7) to rotate at a constant speed. A plurality of arc-shaped resistance welding blocks (9) are evenly distributed in an annular shape on the outside of an insulating column (7); a circular groove (10) is provided at the bottom of the insulating column (7); and the circular groove (10) is connected to a plurality of pressing mechanisms (11); each pressing mechanism (11) is used to apply a pressing force to the arc-shaped resistance welding block (9) on the same side in a direction away from the insulating column (7); a center hole (12) is provided on the upper groove wall of the circular groove (10); a conductive component (13) is installed at the notch of the circular groove (10); the conductive component (13) is used to seal the circular groove (10), and the conductive component (13) is electrically connected to each arc-shaped resistance welding block (9); The air supply unit (14) is installed on the side wall of the support frame (2), and the air supply unit (14) is connected to the central hole (12).

2. A valve welding device according to claim 1, characterized in that: The driving mechanism (8) comprises a supporting sleeve (81) fixedly mounted on the inner wall of the top of the mounting cover (4); the inner wall of the supporting sleeve (81) is rotatably connected to an insulating plate (82) via a sealing bearing; the insulating plate (82) is fixedly connected to the top of the insulating column (7); the upper end of the side wall of the insulating column (7) is fixedly sleeved with a gear sleeve (83); a driving motor (84) is fixedly mounted on the top of the mounting cover (4); the output shaft of the driving motor (84) is rotatably connected to the top of the mounting cover (4); the output shaft of the driving motor (84) is mounted with a moving gear (85); the moving gear (85) is meshed with the gear sleeve (83); and the driving motor (84) is electrically connected to the controller (6).

3. A valve welding device according to claim 1, characterized in that: Each of the pressing mechanisms (11) comprises a glass fiber reinforced plastic sleeve (111) fixedly plugged into the lower end of the side wall of the insulating column (7), and the glass fiber reinforced plastic sleeve (111) is connected to the inside of the circular groove (10), a piston (112) is slidably connected to the inside of the glass fiber reinforced plastic sleeve (111), a connecting column (113) is fixedly installed on the side wall of the piston (112), an insulating mounting column (114) is installed on the inner arc surface of the arc-shaped resistance welding block (9), and the insulating mounting column (114) is detachably connected to the insulating column (7), and a spring (115) is provided between the piston (112) and the inner wall of the glass fiber reinforced plastic sleeve (111).

4. A valve welding device according to claim 2, characterized in that: The conductive component (13) comprises an insulating sealing block (131) installed at the notch of the circular groove (10), and the insulating sealing block (131) seals the notch of the circular groove (10); a main conductive block (132) is fixedly installed at the bottom of the insulating sealing block (131); a plurality of arc-shaped conductive blocks (133) are evenly distributed in an annular shape on the outer side of the main conductive block (132); and the bottom of each arc-shaped resistance welding block (9) is aligned with the bottom of the arc-shaped conductive block (133) on the same side. The top of the arc-shaped conductive block (133) is in sliding contact with the main conductive block (132), and a conductive column (134) is fixedly arranged between each of the arc-shaped conductive blocks (133) and the main conductive block (132). A conductive shaft (136) is installed on the end surface of the main conductive block (132), and the top of the conductive shaft (136) passes through the center hole (12) and is fixedly connected to a rotary joint (135). The top of the rotary joint (135) passes through the insulating plate (82), and the rotary joint (135) is electrically connected to the controller (6).

5. A valve welding device according to claim 2, characterized in that: The air supply unit (14) comprises an air pump (141) fixedly mounted on the side wall of the support frame (2); the air outlet end of the air pump (141) is fixedly connected to a connecting hose (142); the end surface of the mounting cover (4) is fixedly plugged with an air supply hard pipe (143), and the air supply hard pipe (143) is connected to the connecting hose (142); the air supply hard pipe (143) is connected to the interior of the support sleeve (81); the end surface of the insulating plate (82) is provided with a plurality of connecting holes (144) connected to the central hole (12); the air pump (141) is electrically connected to the controller (6); and the air supply unit (14) is installed with a heat dissipation component (15).

6. A valve welding device according to claim 5, characterized in that: The heat dissipation assembly (15) comprises a shunt pipe (151) fixedly plugged into the end surface of the mounting cover (4), and the shunt pipe (151) is connected to the air supply hard pipe (143), the air outlet end of the shunt pipe (151) is arranged on the outside of the support sleeve (81), a normally closed solenoid valve (152) is installed inside the shunt pipe (151), and a normally open solenoid valve (153) is installed inside the air supply hard pipe (143) near the air outlet end, and both the normally closed solenoid valve (152) and the normally open solenoid valve (153) are electrically connected to the controller (6).

7. A valve welding device according to claim 2, characterized in that: An air pressure detector (16) is fixedly plugged into the side wall of the support sleeve (81), and a detection end of the air pressure detector (16) is arranged on the inner side of the support sleeve (81). The air pressure detector (16) is electrically connected to the controller (6).

8. A valve welding device according to claim 2, characterized in that: A timer (17) is fixedly mounted on the top inner wall of the mounting cover (4), and the timer (17) is arranged on the inner side of the supporting sleeve (81), and the timer (17) is electrically connected to the controller (6).

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