CN217749810U

CN217749810U - Plasma spray welding mechanism and temperature maintaining device thereof

Info

Publication number: CN217749810U
Application number: CN202222026478.4U
Authority: CN
Inventors: 王平; 费天文; 彭波; 陈荣昌; 王占洲; 赖修奇; 倪伟
Original assignee: CHINA VALVE CO LTD
Current assignee: CHINA VALVE CO LTD
Priority date: 2022-08-02
Filing date: 2022-08-02
Publication date: 2022-11-08
Anticipated expiration: 2032-08-02

Abstract

The utility model discloses a plasma spray welding mechanism and temperature maintenance device thereof relates to valve technical field, can prevent to keep away from plasma spray welding gun's partial surfacing layer temperature shock drop at the build-up welding in-process, and then leads to the surfacing layer to produce crackle. Wherein the temperature maintaining device comprises a frame body and a flame spraying assembly; the flaming assembly comprises a flaming pipe, the input end of the flaming pipe is communicated with the gas conveying pipe, the output end of the flaming pipe is provided with a plurality of flaming ports arranged side by side, flaming cylinders are respectively hinged outside the flaming ports, and flaming holes for guiding the flame to spray out are formed in the flaming cylinders; the support body sets up spout fire subassembly below for support the subassembly that spouts fire. The utility model discloses can toast the region that has the fracture risk to being welded the work piece working face at the build-up welding in-process to the messenger maintains this regional temperature, makes its build-up welding layer temperature peripheral with the welding position close, and then prevents because the too big work piece build-up welding layer that leads to of temperature gradient from taking place the fracture.

Description

Plasma spray welding mechanism and temperature maintaining device thereof

Technical Field

The utility model relates to a valve processing technology field, concretely relates to plasma spray welding mechanism and temperature maintenance device thereof.

Background

In the production process of the valve, in order to improve the high temperature resistance and the erosion resistance of the sealing surface of the valve, the sealing surface is subjected to plasma surfacing frequently, specifically, an annular workpiece to be welded rotates around the axis of the workpiece, and a plasma spray welding gun is arranged at a position 10mm above the working surface of the workpiece to be welded, namely the sealing surface of the valve, so that an additional surfacing layer is formed on the working surface.

During the rotation of the welded workpiece, the temperature of the overlaying layer on the part close to the plasma spray welding gun is extremely high, wherein the temperature of a molten pool at the plasma spray welding part is about 1300-1600 ℃, the temperature of the overlaying layer far away from the plasma spray welding gun is suddenly reduced, and the suddenly changed temperature can cause cracks on the overlaying layer with high hardness to cause product rejection.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: provided are a plasma spray welding mechanism and a temperature maintaining device, which can reduce the temperature gradient of the whole welded workpiece in the process of overlaying and further avoid cracks of an overlaying layer.

The utility model discloses a following technical scheme realizes:

a temperature maintaining device comprises a frame body and a flame spraying assembly;

the flame spraying assembly comprises a flame spraying pipe, the input end of the flame spraying pipe is communicated with a gas conveying pipe, the output end of the flame spraying pipe is provided with a plurality of flame spraying ports arranged side by side, flame spraying barrels are respectively hinged outside the flame spraying ports, and flame spraying holes for guiding the spraying direction of flame are formed in the flame spraying barrels;

the support body sets up spout fire subassembly below, be used for right it supports to spout fire subassembly.

Optionally, the flame-throwing pipe includes a first pipe and a second pipe that are communicated with each other, the second pipe is provided with a plurality of spherical bumps at intervals along an axial direction thereof, and one side of each spherical bump, which is far away from the second pipe, is provided with the flame-throwing port;

the hinge end of the flaming cylinder body is provided with an arc-shaped groove matched with the spherical convex block, the bottom of the arc-shaped groove is communicated with the input end of the flaming hole, and the arc-shaped groove is sleeved on the spherical convex block.

Further optionally, the flame-throwing hole comprises a conical section and a cylindrical section, an upper bottom surface of the conical section is communicated with the flame-throwing port, and a lower bottom surface of the conical section is in consistent diameter with and coaxially communicated with an end surface of one end of the cylindrical section.

Optionally, the input end of the first pipeline is provided with a valve switch, and the valve switch can be connected with the gas transmission pipe.

Optionally, the second pipeline is of an arc-shaped structure, and the fire-jet opening is arranged on the side face of one side of the second pipeline, which corresponds to the arc inner support.

Optionally, the frame body includes base, flexible pole setting and footstock that connect gradually, flexible pole setting is used for adjusting the height of footstock, have on the footstock and be used for placing the plane of placing of flame projecting pipe, it is equipped with on the plane of placing and is used for a plurality of holder to place, the holder both ends pass through the screw with the footstock is connected, when screwing the screw, the holder can be close to place the plane and carry out the centre gripping to the flame projecting pipe and fix.

Further optionally, flexible pole setting includes the first body of rod and the second body of rod, the bottom alternate of the first body of rod is in the top of the second body of rod, and with the top threaded connection of the second body of rod.

Optionally, the output direction of the fire-jet is inclined towards the bottom end direction of the telescopic vertical rod, and the inclined included angle is 20-45 degrees.

A plasma spray welding mechanism comprises a rotary table, a spray welding gun and a temperature maintaining device in any scheme, wherein the spray welding gun and all the temperature maintaining devices are arranged at intervals in the circumferential direction around the axis of the rotary table, and the fire spraying holes of all the temperature maintaining devices point to the axis of the rotary table;

wherein the carousel is used for placing by welding the work piece and drives by welding the coaxial rotation of work piece, it is the circle annular structure to be welded the work piece, keep away from on the work piece one side of carousel is the working face, it is regional with the second to have first region on the working face, spray welding gun is used for carrying out the build-up welding to the working face that is in the first region, temperature maintenance device is used for to the working face blowout flame that is in the second region in order to heat it.

Optionally, be equipped with fixed subassembly on the carousel, fixed subassembly includes a plurality of spares, the spares wind the axis circumference interval of carousel sets up, the spares include dog, bolt, thread table and spout, the spout is followed the radial direction setting of carousel is on the carousel, the bottom of dog slides and sets up in the spout, the thread table is fixed the one end that the carousel axis was kept away from to the spout, the bolt along being on a parallel with the direction threaded connection of spout is in the thread table, the dog can the extrusion of the screw thread end of bolt is down towards the axis of carousel removes to support and lean on the bottom by the weldment.

The utility model discloses have following advantage and beneficial effect:

the utility model provides a pair of plasma spray welding mechanism and temperature maintenance device thereof, adjust flame blowout direction through each flame projecting barrel, so that each flame of blowout can be comparatively even cover keep away from plasma spray welding gun and surface temperature by the weldment operation face and be less than suitable high temperature and have the region of fracture risk, and then toast this region at the build-up welding in-process, so that maintain this regional temperature, make it close with the peripheral build-up welding layer temperature of welding position, and then prevent that the work piece build-up welding layer that leads to because temperature gradient is too big from taking place the fracture.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

fig. 1 is an overall structure diagram of embodiment 1 of the present invention;

fig. 2 is an overall side view of embodiment 1 of the present invention;

FIG. 3 is a side sectional view of a burner port according to embodiment 1 of the present invention;

fig. 4 is an overall plan view of embodiment 2 of the present invention;

fig. 5 is a schematic side view of embodiment 2 of the present invention.

Reference numbers and corresponding part names in the figures:

1-temperature maintaining device, 11-first pipeline, 12-second pipeline, 121-spherical bump, 122-flame nozzle, 13-flame barrel, 131-flame hole, 14-gas pipe, 15-valve switch, 16-frame, 161-base, 162-first rod, 163-second rod, 164-top seat, 165-clamping piece, 2-turntable, 21-stop block, 22-bolt, 23-thread table, 24-chute, 3-spray welding gun and 4-welded workpiece.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more clearly understood, the following description is given for further details of the present invention with reference to the accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention, and are not intended to limit the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.

Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or examples are included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the description of the present invention, the terms "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the scope of the present invention.

Example 1:

a temperature maintenance device, as shown in fig. 1 to 3, includes a frame body 16 and a flaming assembly;

the flame spraying assembly comprises a flame spraying pipe, the input end of the flame spraying pipe is communicated with a gas conveying pipe 14, the gas conveying pipe 14 is used for conveying natural gas into the flame spraying pipe, the output end of the flame spraying pipe is provided with a plurality of flame spraying ports 122 which are arranged side by side, the flame spraying ports 122 are respectively hinged to the outer parts of the flame spraying ports 13, and flame spraying holes 131 used for guiding the spraying direction of flame are formed in the flame spraying cylinders 13;

the support body 16 sets up spout fire subassembly below, be used for right it supports to spout fire subassembly.

On the working surface of the workpiece 4 to be welded, an area which is close to the plasma spray welding gun 3, influenced by the overlaying welding of the plasma spray welding gun 3, has proper high temperature and is not easy to crack is determined as a first area, and an area which is far away from the plasma spray welding gun 3, has lower surface temperature than the proper high temperature and has cracking risk is determined as a second area. Before plasma spray welding the working surface of the workpiece 4 to be welded, a plurality of temperature maintaining devices 1 are arranged at positions far away from the plasma spray welding gun 3 around the workpiece 4 to be welded, and at this moment, a plurality of temperature maintaining devices 1 and the plasma spray welding gun 3 are arranged at intervals around the circumference of the workpiece 4 to be welded. The flame ports 122 of the plurality of temperature maintenance devices 1 are arranged circumferentially around the workpiece 4 to be welded at a position far away from the plasma torch 3, the flame spraying direction is adjusted through each flame spraying cylinder 13, so that each sprayed flame can uniformly cover the second area of the working surface of the workpiece 4 to be welded, the second area of the working surface of the workpiece 4 to be welded and the overlaying layer thereon are baked in the overlaying process, the temperature of the second area is maintained, and cracking of the workpiece overlaying layer caused by overlarge temperature gradient is prevented.

The flame spraying pipe comprises a first pipe 11 and a second pipe 12 which are communicated with each other, the second pipe 12 is provided with a plurality of spherical lugs 121 at intervals along the axial direction, and one side of each spherical lug 121 far away from the second pipe 12 is provided with a flame spraying opening 122;

the hinged end of the flame spraying cylinder body 13 is provided with an arc-shaped groove matched with the spherical convex block 121, the bottom of the arc-shaped groove is communicated with the input end of the flame spraying hole 131, the arc-shaped groove is sleeved on the spherical convex block 121, so that the flame spraying cylinder body 13 is hinged with a flame spraying pipe, and flame sprayed from the flame spraying port 122 can be sprayed out in a preset direction under the guidance of the flame spraying hole 131 in the flame spraying cylinder body 13.

Wherein the input end of the first pipeline 11 is provided with a valve switch 15, and the valve switch 15 can be connected with an air conveying pipe 14. The valve switch 15 is used to block the input of the combustible gas, or adjust the input of the combustible gas in the first pipeline 11, so as to adjust the size of the flame ejected from each flame ejection opening 122.

The second pipeline 12 is in an arc-shaped structure, and the fire-jet 122 is arranged on the side surface of the second pipeline 12 corresponding to the arc inner support. The circular arc structure of the second pipeline 12 is adapted to the circular ring structure of the welded workpiece 4, so that the distance between the fire-jet 122 and the welded workpiece 4 can be as close as possible, and the heating effect of the flame on the welded workpiece 4 is similar. However, the welded workpiece 4 including the valve sealing surface has various diameters, so that excessive requirements on the diameter of the circular arc structure are not required, and only a certain distance difference needs to be compensated through the circular arc structure.

In one or more embodiments, the flame spray hole 131 includes a conical section and a cylindrical section, an upper bottom surface of the conical section is communicated with the flame spray opening 122, and a lower bottom surface of the conical section is consistent in diameter and coaxially communicated with an end surface of one end of the cylindrical section. The diameter of the upper bottom surface of the conical section is smaller than that of the lower bottom surface, and the diameters of the sections of the conical section and the cylindrical section are larger than that of the flame ports 122, so that flames sprayed out of the flame spraying holes 131 can be diffused relatively, a larger area can be covered, and the condition that the welded workpiece 4 or the surfacing layer is damaged due to over concentration of the flames is avoided.

In one or more embodiments, the frame body 16 includes a base 161, a telescopic vertical rod and a top seat 164, which are connected in sequence, the telescopic vertical rod is used for adjusting the height of the top seat 164, a placing plane for placing the fire-spraying tube is arranged on the top seat 164, a plurality of clamping members 165 are arranged on the placing plane, two ends of each clamping member 165 are connected with the top seat 164 through screws, and when the screws are screwed, the clamping members 165 can be close to the placing plane and clamp and fix the fire-spraying tube. Thus, the flame-throwing pipe is fixed on the top seat 164 by the clamping piece 165, and the height of the top seat 164 and the flame-throwing pipe is adjusted by the telescopic vertical pipe, so that the height of the flame-throwing pipe can be adjusted according to the height and the thickness of the workpiece 4 to be welded, and the flame of the flame can cover the working surface of the workpiece 4 to be welded.

The telescopic vertical rod comprises a first rod body 162 and a second rod body 163, and the bottom end of the first rod body 162 is inserted at the top end of the second rod body 163 and is in threaded connection with the top end of the second rod body 163. Thereby adjusting the position of the first lever 162 in the second lever 163 by rotating the first lever 162, thereby achieving telescoping.

The top seat 164 can be rotatably connected to the top end of the first rod 162, so that each of the torches 122 of the torch can be directed to the workpiece 4 to be welded.

In one or more embodiments, the output direction of the flame nozzle 122 is inclined toward the bottom end of the telescopic vertical rod, and the inclined angle is 20 to 45 degrees, so that the flame output from the flame-spraying pipe can cover the working surface of the workpiece 4 to be welded, because the diffused flame inevitably inclines upwards in the output process. Therefore, the flame discharged from the flame port 122 is first discharged downward in the discharge direction of the flame port 122 by the output pressure of the gas pipe 14, and moves upward after contacting the work surface of the workpiece 4 to be welded, thereby ensuring that the flame can cover the workpiece 4 to be welded.

Example 2:

a plasma spray welding mechanism, as shown in fig. 4 to 5, comprising a turntable 2, a spray welding gun 3 and any one of the temperature maintaining devices 1 described in embodiment 1, wherein the spray welding gun 3 and all the temperature maintaining devices 1 are circumferentially arranged around the axis of the turntable 2 at intervals, and the fire spraying holes 131 of all the temperature maintaining devices 1 point to the axis of the turntable 2;

wherein carousel 2 is used for placing by welding work piece 4 and drive by the coaxial rotation of welding work piece 4, by welding work piece 4 and being the circle annular structure, keep away from on the welding work piece 4 one side of carousel 2 is the working face, it is regional with the second to have first region on the working face, spray welding gun 3 is used for carrying out the build-up welding to the working face that is in the first region, temperature maintenance device 1 is used for to the working face blowout flame that is in the second region in order to heat it.

The welded workpiece 4 is a part with a sealing surface in the valve, the working surface is the sealing surface, and the first area and the second area are fixed areas arranged on the welded workpiece 4 and do not change positions along with the rotation of the welded workpiece 4. When the surfacing welding needs to be carried out on the working face of a workpiece 4 to be welded, the workpiece 4 to be welded is coaxially placed on the rotary table 2, the rotary table 2 is opened to enable the workpiece 4 to be welded to rotate coaxially with the rotary table 2, the spray welding gun 3 carries out surfacing welding on the working face of the workpiece 4 to be welded in a first area, the surfacing layer formed at the moment moves from the first area to a second area along with the rotation of the rotary table 2, the temperature of the surfacing layer cannot change sharply under the baking of flame sprayed by the temperature maintaining device 1, and further the workpiece surfacing layer caused by overlarge temperature gradient is prevented from cracking.

It should be noted that, a water cooling system is usually provided in the gun body of the spray welding gun 3 for cooling, so that the flame sprayed from the temperature maintaining device 1 can be kept away from the spray welding gun 1 by circumferentially arranging the spray welding gun 3 and the temperature maintaining device 1 and adjusting the flame spraying direction of the temperature positioning device 1, thereby avoiding affecting the cooling effect of the water cooling system in the spray welding gun.

Wherein, be equipped with fixed subassembly on carousel 2, fixed subassembly includes a plurality of pieces that support, support the piece around the axis circumference interval of carousel 2 sets up, support the piece and include dog 21, bolt 22, thread table 23 and spout 24, spout 24 follows the radial direction of carousel 2 sets up on carousel 2, the bottom of dog 21 slides and sets up in spout 24, thread table 23 fixes the spout 24 is kept away from the one end of carousel 2 axis, bolt 22 along being on a parallel with the direction threaded connection of spout 24 is in thread table 23, dog 21 can the extrusion of the thread end of bolt 22 is down towards the axis of carousel 2 removes to support and lean on in the bottom of being welded work piece 4. The welded workpiece 4 is positioned through the plurality of abutting pieces, the welded workpiece 4 can rotate coaxially with the rotary table 2, and the forming quality of the surfacing surface is improved.

The above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A temperature maintenance device, characterized by comprising a frame body (16) and a flame projecting assembly;

the flame spraying assembly comprises a flame spraying pipe, the input end of the flame spraying pipe is communicated with a gas conveying pipe (14), the output end of the flame spraying pipe is provided with a plurality of flame spraying ports (122) which are arranged side by side, the flame spraying ports (122) are respectively hinged with a flame spraying cylinder body (13), and the flame spraying cylinder body (13) is internally provided with a flame spraying hole (131) for guiding the spraying direction of flame;

the support body (16) is arranged below the flaming assembly and used for supporting the flaming assembly.

2. A temperature maintaining device according to claim 1, characterized in that the flame-throwing tube comprises a first tube (11) and a second tube (12) which are communicated with each other, the second tube (12) is provided with a plurality of spherical projections (121) at intervals along the axial direction thereof, and the flame-throwing port (122) is opened on one side of the spherical projections (121) far away from the second tube (12);

the hinge joint end of the flaming cylinder body (13) is provided with an arc-shaped groove matched with the spherical convex block (121), the groove bottom of the arc-shaped groove is communicated with the input end of the flaming hole (131), and the arc-shaped groove is sleeved on the spherical convex block (121).

3. A temperature maintenance device according to claim 2, wherein said flame-projecting hole (131) comprises a conical section and a cylindrical section, an upper bottom surface of said conical section communicating with said flame-projecting port (122), and a lower bottom surface of said conical section communicating coaxially with and in diameter with an end surface of said cylindrical section.

4. A temperature maintaining arrangement according to claim 2, characterised in that the input of the first conduit (11) is provided with a valve switch (15), which valve switch (15) is connectable to the air conveying pipe (14).

5. A temperature maintaining device according to claim 2, characterized in that the second pipe (12) is formed in a circular arc shape, and the flame ports (122) are arranged on a side surface of the second pipe (12) corresponding to the inner support of the circular arc.

6. The temperature maintaining device according to claim 1, wherein the frame body (16) comprises a base (161), a telescopic vertical rod and a top seat (164) which are connected in sequence, the telescopic vertical rod is used for adjusting the height of the top seat (164), a placing plane for placing the flame spraying pipe is arranged on the top seat (164), a plurality of clamping pieces (165) are arranged on the placing plane, two ends of each clamping piece (165) are connected with the top seat (164) through screws, and when the screws are tightened, the clamping pieces (165) can be close to the placing plane and clamp and fix the flame spraying pipe.

7. A temperature maintenance device according to claim 6, wherein said telescopic vertical rod comprises a first rod (162) and a second rod (163), and a bottom end of said first rod (162) is inserted into a top end of said second rod (163) and is in threaded connection with a top end of said second rod (163).

8. A temperature maintenance device according to claim 6, characterized in that the output direction of said flame ports (122) is inclined towards the bottom end of said telescopic vertical rod at an angle of 20 ° to 45 °.

9. A plasma spray welding mechanism, characterized in that the mechanism comprises a rotary table (2), a spray welding gun (3) and a plurality of temperature maintaining devices (1) according to any one of claims 1-8, wherein the spray welding gun (3) and all the temperature maintaining devices (1) are arranged at intervals around the axis of the rotary table (2), and the fire spraying holes (131) of all the temperature maintaining devices (1) point to the axis of the rotary table (2);

wherein carousel (2) are used for placing by welding work piece (4) and drive by welding work piece (4) coaxial rotation, be the circle annular structure by welding work piece (4), keep away from on being welded work piece (4) one side of carousel (2) is the working face, first region and second region have on the working face, spray welding rifle (3) are used for carrying out the build-up welding to the working face that is in first region, temperature maintenance device (1) are used for to the working face blowout flame that is in the second region in order to heat it.

10. A plasma spray welding mechanism according to claim 9, characterized in that a fixing assembly is arranged on the rotary table (2), the fixing assembly comprises a plurality of abutting members, the abutting members are circumferentially spaced around the axis of the rotary table (2), the abutting members comprise a stopper (21), a bolt (22), a thread table (23) and a sliding groove (24), the sliding groove (24) is arranged on the rotary table (2) along the radial direction of the rotary table (2), the bottom of the stopper (21) is slidingly arranged in the sliding groove (24), the thread table (23) is fixed at one end of the sliding groove (24) far away from the axis of the rotary table (2), the bolt (22) is screwed in the thread table (23) along the direction parallel to the sliding groove (24), and the stopper (21) can move towards the axis of the rotary table (2) under the extrusion of the thread end of the bolt (22) and abut against the bottom of the workpiece (4) to be welded.