CN214558121U - Spot welding fixing device for replacing valve seat of high-pressure valve - Google Patents

Abstract

The utility model relates to a spot welding fixing device for replacing a valve seat of a high-pressure relief valve, which comprises a rotating shaft assembly, a connecting shaft assembly, a driving shaft assembly and a spot welding assembly; the rotating shaft assembly comprises a rotating shaft and a sleeve; the connecting shaft assembly comprises a connecting shaft and a shell, and the connecting shaft is connected with the rotating shaft; the driving shaft assembly comprises a driving shaft and an insulating connecting block; the spot welding subassembly includes, the torch head, the circumference side of torch head is equipped with the nozzle, be equipped with the tungsten electrode in the nozzle and press from both sides the tungsten electrode of centre gripping by the tungsten electrode, it makes high valve disk seat change work on line can greatly reduced cost of maintenance, time limit for a project and personnel's dosage for traditional whole valve body of change, it is fixed that the disk seat provides reliable new disk seat spare part spot welding in the change process on line, it is very critical to successfully accomplishing work such as disk seat group to welding, can improve work efficiency, ensure work quality, reduce the staff and receive the radiation dose.

Description

Spot welding fixing device for replacing valve seat of high-pressure valve

Technical Field

The utility model relates to a nuclear power technology field especially relates to a spot welding fixing device is changed to high valve disk seat that puts.

Background

The valve is a control part in a fluid conveying system, has the functions of stopping (closing), adjusting, guiding, preventing counter flow, stabilizing pressure, shunting, overflowing and relieving pressure and the like, and is widely applied to nuclear power plants. The primary loop large-caliber gate valve and the check valve belong to a nuclear first-stage valve, and the valves have high radioactivity due to activation, radioactive substance deposition and the like, and are collectively called as high-level discharge valves. When the fluid has radioactivity, a high-pressure valve (a nuclear-grade valve) needs to be used for replacing a common valve so as to improve the safety level (for example, the high-pressure valve has the characteristics of good radiation blocking effect, longer rated service life and the like compared with the common valve).

As shown in fig. 1 to 5, the high pressure relief valve 10 generally includes a valve body 100, a valve seat ring 14, a guide rail 16, and a weld 18, where the valve body 100 includes a horizontal tube 110 and a vertical tube 120 located in the middle of the horizontal tube 110 and communicated with the horizontal tube 110, a central axis 104 of the vertical tube 120 is perpendicular to a central axis 102 of the horizontal tube 110, the vertical tube 120 and an end surface 122 of an open end of the vertical tube 120 are provided with a boss 124, the end surface 122 of the open end of the vertical tube 120 is provided with a plurality of first mounting holes 126, and the plurality of first mounting holes 126 are arranged at intervals around the boss 124. Cross tube 110 includes two branch tubes 112 located on either side of a vertical tube 120. The number of valve seat rings 14 is two, and the two valve seat rings 14 correspond to the two branch pipes 112, respectively. Valve seat ring 14 is located in branch pipe 112, valve seat ring 14 includes sealing surface 14a, sealing surface 14a is used for fitting with the valve clack (not shown) inserted in standpipe 120, forming a sealing system, and the closing function of high-pressure discharge valve 10 is realized, and the end of valve seat ring 14 far away from sealing surface 14a is connected with branch pipe 112 through welding seam 18 in a sealing manner. Wherein the valve flap slides in and out of the standpipe 120 along the guide rail 16. The guide rails 16 are arranged on the inner wall of the vertical tube 120 and extend into the transverse tube 110 along the vertical direction, the number of the guide rails 16 is two, and the two guide rails 16 are arranged opposite to each other at intervals and are arranged at intervals along the longitudinal direction.

When a serious defect occurs in the sealing surface 14a of the valve seat ring 14, and the sealing surface 14a is attached to the valve flap inserted into the vertical pipe 120, a good sealing system cannot be formed, the maintenance means usually adopted is to replace the whole high-level valve 10, but the high-level valve 10 of the nuclear power plant is high in manufacturing cost, and the irradiation dose of personnel in the replacement process is high, namely, the problem of high cost and insecurity exists in replacing the whole high-level valve 10. To solve the above problem, those skilled in the art have conceived of replacing the entire high relief valve 10 by replacing the damaged valve seat ring 14, and prior to replacing the valve seat ring 14, it is necessary to cut the weld 18 using a weld cutting apparatus to separate the valve seat ring 14 from the branch pipe 112, thereby removing the valve seat ring 14.

At present, when a conventional argon arc welding gun stretches into a vertical pipe 120 for valve seat spot welding operation, the problem that the visual field of a welder is blocked and a working point cannot be effectively observed exists, and potential risks are caused to welding quality. When the spot welding quality is poor, the spot welding fixation is possibly invalid due to the influence of local cooling shrinkage force of the welding line in the welding process of the welding line of the valve seat, and serious economic losses such as poor installation position of the valve seat, damage of spare parts, delayed construction period due to rework and the like can be caused.

Due to the particularity of a nuclear power system and the structural characteristics of a valve, a large amount of activated radioactive substances are accumulated in a valve cavity of a primary circuit, so that a radiation hot spot is formed, and the closer a worker is to the valve cavity, the more the irradiated dose is in a certain working time. The conventional argon arc welding gun is short in length, a hand of a welder needs to be completely inserted into the valve cavity when the argon arc welding gun is used, the body of the welder is very close to a radiation hot spot, and the actual irradiated dose of personnel is large.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in providing a spot welding fixing device is changed to high valve disk seat of putting.

The utility model provides a technical scheme that its technical problem adopted is: the spot welding fixing device for replacing the valve seat of the high-pressure relief valve comprises a rotating shaft assembly, a connecting shaft assembly connected with the rotating shaft assembly and a driving shaft assembly vertically connected with the connecting shaft assembly, wherein a spot welding assembly is arranged at one end, away from the connecting shaft assembly, of the driving shaft assembly;

the rotating shaft assembly comprises a rotating shaft and a sleeve sleeved on the periphery of the rotating shaft;

the connecting shaft assembly comprises a connecting shaft and a shell sleeved on the periphery of the connecting shaft, and the connecting shaft is connected with the rotating shaft and is coaxial with the rotating shaft;

the driving shaft assembly comprises a driving shaft and an insulating connecting block, the top of the driving shaft is meshed with the connecting shaft, and the bottom end of the driving shaft is fixedly connected with the top of the insulating connecting block;

the spot welding subassembly include with the bottom fixed connection of insulating connecting block, and the welding torch head of being connected respectively with argon gas source and power, the circumference side of welding torch head is equipped with the nozzle, be equipped with the tungsten utmost point in the nozzle and press from both sides and receive the tungsten utmost point of tungsten utmost point clamp centre gripping.

Preferably, the sleeve is fixedly connected with the rotating shaft through a fastener.

Preferably, one end of the rotating shaft, which is far away from the connecting shaft, is also provided with a pulsator handle.

Preferably, a first deep groove ball bearing and a second deep groove ball bearing are respectively arranged at the front end and the rear end of the connecting shaft, and the first deep groove ball bearing and the second deep groove ball bearing are respectively abutted to the periphery of the connecting shaft and the inner wall of the shell.

Preferably, the periphery of the connecting shaft is provided with a first bevel gear, and the top of the driving shaft is provided with a second bevel gear which are meshed with each other.

Preferably, the periphery of the driving shaft is provided with a bearing seat, and a third deep groove ball bearing is arranged between the periphery of the driving shaft and the inner wall of the bearing seat.

Preferably, the periphery of the torch head is sleeved with an insulating sleeve, a gas transmission channel extending along the axial direction is arranged in the torch head, and the tungsten electrode clamp and the tungsten electrode are connected with the gas transmission channel.

Preferably, the argon gas source connector is arranged on the side wall of the welding torch head and penetrates through the insulating sleeve to be connected with the gas transmission channel, and the argon gas source connector is connected with the argon gas source to input argon gas into the gas transmission channel;

and the air source connector penetrates through the insulating sleeve and the side wall of the welding torch head to be connected with the air transmission channel, and the air source connector is connected with the power supply to input current to the air transmission channel.

Preferably, a flow divider is further arranged between the periphery of the tungsten electrode clamp and the inner wall of the nozzle.

Preferably, the nozzle is provided with a clamping groove block at the periphery.

Implement the utility model discloses following beneficial effect has: the application of the spot welding fixing device for replacing the high-pressure valve seat enables the maintenance cost, the construction period and the personnel dosage of the high-pressure valve seat to be greatly reduced compared with the traditional method for replacing the whole valve body. The valve seat provides reliable spot welding fixation of new valve seat spare parts in the online replacement process, and is very key for successfully completing the work of welding and the like of the valve seat group, so that the working efficiency can be improved, the working quality can be ensured, and the irradiated dose of workers can be reduced.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

FIG. 1 is a schematic perspective view of a high relief valve;

FIG. 2 is a front view of the high relief valve;

FIG. 3 is a top plan view of the high relief valve of FIG. 2;

FIG. 4 is a cross-sectional view taken along line AA in FIG. 2;

FIG. 5 is a cross-sectional view taken along line BB of FIG. 2;

FIG. 6 is a schematic structural view of the spot welding fixture for replacing the valve seat of the high relief valve of the present invention;

fig. 7 is the utility model discloses high valve disk seat changes spot welding fixing device's application schematic diagram.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "upper", "lower", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are configured and operated in specific directions based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present invention, but do not indicate that the device or element referred to must have a specific direction, and thus, should not be construed as limiting the present invention.

It is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," "disposed," and the like are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or intervening elements may also be present. The terms "first", "second", "third", etc. are only for convenience in describing the present technical solution, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

As shown in figure 6 the utility model discloses a spot welding fixing device is changed to high valve disk seat that puts, including pivot subassembly, the connecting axle subassembly of being connected with the pivot subassembly, with the perpendicular drive shaft subassembly of being connected of connecting axle subassembly, the drive shaft subassembly is kept away from connecting axle subassembly one end and is equipped with spot welding subassembly.

Further, the rotating shaft assembly includes a rotating shaft 21 and a sleeve 22 sleeved on the periphery of the rotating shaft 21, the connecting shaft assembly includes a connecting shaft 25 and a housing 26 sleeved on the periphery of the connecting shaft 25, the connecting shaft 25 is connected with the rotating shaft 21, and the connecting shaft 25 and the rotating shaft 21 are coaxial. The drive shaft assembly comprises a drive shaft 210 and an insulation connecting block 214, the top of the drive shaft 210 is meshed with the connecting shaft 25, the bottom end of the drive shaft 210 is fixedly connected with the top of the insulation connecting block 214, the spot welding assembly comprises a welding torch head 215 which is fixedly connected with the bottom of the insulation connecting block 214 and is respectively connected with an argon gas source and a power supply, a nozzle 217 is arranged on the circumferential side surface of the welding torch head 215, and a tungsten electrode clamp 219 and a tungsten electrode 218 clamped by the tungsten electrode clamp 219 are arranged in the nozzle 217. In the use process, the extension length of the tungsten electrode 218 is adjusted to be proper, the rotating shaft assembly, the connecting shaft assembly and the driving shaft assembly are driven to rotate, the tip of the tungsten electrode 218 rotates circumferentially around the central axis of the insulating connecting block 214, and after a proper angle is selected, a worker holds the sleeve 22 by hand and positions the sleeve at a to-be-welded slope, so that spot welding can be performed.

Preferably, the sleeve 22 is fixedly connected to the rotating shaft 21 through a fastening member 23, a through hole is formed in a circumferential side surface of the sleeve 22, the fastening member 23 may be a bolt, a screw, or a cylindrical pin, and the through hole is penetrated through by the fastening member 23 and abuts against a circumferential side wall of the rotating shaft 21, so as to fix the rotating shaft 21 to the sleeve 22, in some embodiments, an accommodating space is reserved between inner side walls at two ends of the sleeve 22 and the rotating shaft 21, a connecting block or a sealing member is disposed in the accommodating space, and the aforementioned fastening member 23 is penetrated through a side wall of the sleeve 22 and abuts against a circumferential side wall of the rotating shaft 21 after passing through the connecting block or the sealing member.

Preferably, the end of the rotating shaft 21 away from the connecting shaft 25 is further provided with a pulsator handle 24, if the left end of the rotating shaft 21 is provided with the pulsator handle 24, the end of the left end of the rotating shaft 21 is provided with an external thread, the side of the pulsator handle 24 facing the rotating shaft 21 is provided with a positioning cylinder, the positioning cylinder is provided with an internal thread, the positioning cylinder is in threaded connection with the rotating shaft 21, and the pulsator handle 24 may also be directly welded to the end of the rotating shaft 21. The pulsator handle 24 is a circular pulsator corrugated handle.

Preferably, a first deep groove ball bearing 27 and a second deep groove ball bearing 28 are respectively arranged at the front end and the rear end of the connecting shaft 25, and the first deep groove ball bearing 27 and the second deep groove ball bearing 28 are respectively abutted against the outer periphery of the connecting shaft 25 and the inner wall of the housing 26. Further, the left end of the connecting shaft 25 is a connecting cylinder structure, and the right end of the rotating shaft 21 is inserted into the connecting cylinder structure of the connecting shaft 25, which may be a threaded connection.

Preferably, the connecting shaft 25 is provided at the outer circumference thereof with a first bevel gear 29, and the driving shaft 210 is provided at the top thereof with a second bevel gear 212, which are engaged with each other.

Further, a bearing seat 211 is arranged on the outer periphery of the driving shaft 210, and a third deep groove ball bearing 213 is arranged between the outer periphery of the driving shaft 210 and the inner wall of the bearing seat 211.

Preferably, the insulating connection block 214 is a cylindrical structure, the upper and lower ends of the insulating connection block are a first positioning groove and a second positioning groove which are provided with inner recesses, the middle of the insulating connection block is a solid body to isolate the first positioning groove from the second positioning groove, so as to ensure electrical insulation between the rear drive shaft 210 and the torch head 215, the bottom of the drive shaft 210 is installed in the first positioning groove, and can be in threaded connection or welding, and the top of the torch head 215 is installed in the second positioning groove, and can be in threaded connection or welding.

Preferably, the torch head 215 is sleeved with the insulating sleeve 216, the torch head 215 is provided with an axially extending gas delivery channel 2151 therein, and the tungsten electrode clamp 219 and the tungsten electrode 218 are connected with the gas delivery channel 2151.

Preferably, the spot welding fixing device for replacing the high-pressure valve seat further comprises an air source connector 222 penetrating through the side walls of the insulating sleeve 216 and the welding torch head 215 to be connected with the air transmission channel 2151, wherein the air source connector 222 is connected with an argon air source to input argon into the air transmission channel 2151, the air source connector 222 can be connected with the argon air source through an electric welding machine outlet air source pipe, and the electric welding machine outlet air source pipe can be bound on the peripheries of the insulating connecting block 214 and the sleeve 22 through a binding rope.

And the air source connector 222 is arranged on the side wall of the insulating sleeve 216 and the welding torch head 215 in a penetrating way and is connected with the air transmission channel 2151, the air source connector 222 is connected with a power supply to input current to the air transmission channel 2151, if the electric welding machine outlet control connection wire can be adopted to connect the air source connector 222 with the power supply, correspondingly, the periphery of the sleeve 22 can be further provided with a welding handle switch 224 connected with the electric welding machine outlet control connection wire to control the starting and stopping of power transmission.

Preferably, a shunt 220 is further arranged between the periphery of the tungsten electrode clamp 219 and the inner wall of the nozzle 217, a clamping groove block 221 is arranged on the periphery of the nozzle 217, the clamping groove block 221 is used for positioning a groove formed by a weld groove, the tungsten electrode 218 is prevented from shifting and shaking during handheld spot welding, the size of the tungsten electrode 218 can be adaptively modified according to the size of the actual groove to be welded when necessary, the clamping groove block 221 can be made of a high-temperature-resistant insulator, if the tungsten electrode is made of an H62 copper material, the extending length of the tungsten electrode 218 needs to be adjusted to be appropriate, and tip discharge is prevented from being formed between the tip of the tungsten electrode 218 and the clamping groove block 221 during work. The nozzle 217 is a ceramic nozzle.

Referring to fig. 7, when the device is used, the gas source connector 222 is checked to be connected to the outlet of the electric welding machine to control the connection to be firm, the gas source connector 222 is connected to the gas source pipe at the outlet of the electric welding machine to be connected to the argon gas source, the extension length of the tungsten electrode 218 is adjusted to be proper, the impeller handle 24 is rotated to drive the rotating shaft 21, the connecting shaft 215, the driving shaft 210, the insulating connecting block 214, the welding torch head 215 and other components to rotate, so that the tip of the tungsten electrode 218 circumferentially rotates around the central axis of the insulating connecting block 214, after a proper angle is selected, a worker holds the sleeve 22 to position the clamping groove block 221 at the position of a slope to be welded, and the spot welding work can be executed by pressing the welding handle switch 224.

By using the device, the on-line replacement work of the high-pressure valve seat can greatly reduce the maintenance cost, the construction period and the personnel dosage compared with the traditional replacement of the whole valve body. The valve seat provides reliable spot welding fixation of new valve seat spare parts in the online replacement process, and is very key for successfully completing the work of welding and the like of the valve seat group, so that the working efficiency can be improved, the working quality can be ensured, and the irradiated dose of workers can be reduced.

It is to be understood that the foregoing examples merely represent preferred embodiments of the present invention, and that the description thereof is more specific and detailed, but not intended to limit the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims (10)

1. A spot welding fixing device for replacing a valve seat of a high-pressure relief valve is characterized by comprising a rotating shaft assembly, a connecting shaft assembly connected with the rotating shaft assembly, and a driving shaft assembly vertically connected with the connecting shaft assembly, wherein a spot welding assembly is arranged at one end, away from the connecting shaft assembly, of the driving shaft assembly;

the rotating shaft assembly comprises a rotating shaft (21) and a sleeve (22) sleeved on the periphery of the rotating shaft (21);

the connecting shaft assembly comprises a connecting shaft (25) and a shell (26) sleeved on the periphery of the connecting shaft (25), the connecting shaft (25) is connected with the rotating shaft (21) and is coaxial with the rotating shaft;

the driving shaft assembly comprises a driving shaft (210) and an insulating connecting block (214), the top of the driving shaft (210) is meshed with the connecting shaft (25), and the bottom end of the driving shaft (210) is fixedly connected with the top of the insulating connecting block (214);

the spot welding assembly comprises a welding torch head (215) which is fixedly connected with the bottom of the insulating connecting block (214) and is respectively connected with an argon gas source and a power supply, a nozzle (217) is arranged on the circumferential side face of the welding torch head (215), and a tungsten electrode clamp (219) and a tungsten electrode (218) clamped by the tungsten electrode clamp (219) are arranged in the nozzle (217).

2. The high relief valve seat replacement spot welding fixture according to claim 1, wherein the sleeve (22) is fixedly connected to the shaft (21) by a fastener (23).

3. The high relief valve seat replacement spot welding fixing device according to claim 1, wherein a pulsator handle (24) is further provided at an end of the rotating shaft (21) away from the connecting shaft (25).

4. The high relief valve seat replacement spot welding fixing device according to claim 1, wherein a first deep groove ball bearing (27) and a second deep groove ball bearing (28) are respectively arranged at the front end and the rear end of the connecting shaft (25), and the first deep groove ball bearing (27) and the second deep groove ball bearing (28) are respectively abutted against the outer periphery of the connecting shaft (25) and the inner wall of the housing (26).

5. The high relief valve seat replacement spot welding fixing device according to claim 1, wherein the connecting shaft (25) is provided at an outer circumference thereof with a first bevel gear (29), and the driving shaft (210) is provided at a top thereof with a second bevel gear (212), which are engaged with each other.

6. The high relief valve seat replacement spot welding fixing device according to claim 1, wherein a bearing seat (211) is arranged on the outer periphery of the driving shaft (210), and a third deep groove ball bearing (213) is arranged between the outer periphery of the driving shaft (210) and the inner wall of the bearing seat (211).

7. The high relief valve seat replacement spot welding fixture as claimed in claim 1, wherein an insulating sleeve (216) is sleeved on the periphery of the torch head (215), an axially extending gas delivery channel (2151) is arranged in the torch head (215), and the tungsten electrode clamp (219) and the tungsten electrode (218) are connected with the gas delivery channel (2151).

8. The high relief valve seat replacement spot welding fixture as claimed in claim 7, further comprising a gas source connector (222) disposed through the sidewall of said insulator sleeve (216) and said torch head (215) to connect with said gas delivery channel (2151), said gas source connector (222) being connected with said argon gas source to supply argon gas to said gas delivery channel (2151);

and the air source connector (222) is arranged on the side walls of the insulating sleeve (216) and the welding torch head (215) in a penetrating mode and connected with the air transmission channel (2151), and the air source connector (222) is connected with the power supply to input current to the air transmission channel (2151).

9. The high relief valve seat replacement spot welding fixture according to claim 1, wherein a flow divider (220) is further provided between the outer periphery of the tungsten electrode clamp (219) and the inner wall of the nozzle (217).

10. The high relief valve seat replacement spot welding fixture according to claim 1, wherein the nozzle (217) is provided with a notch block (221) at its outer periphery.

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