Valve hardfacing welding device

Abstract

This invention discloses a valve overlay welding device, comprising a processing chamber, which is divided into a preheating chamber and a welding chamber. A moving component is installed throughout the processing chamber along its length. The moving component has clamping plates fixed at equal intervals along its extension direction. The side walls of both the welding chamber and the preheating chamber have slots adapted to the clamping plates, and a rotating clamping mechanism is installed between adjacent clamping plates. A driving mechanism is also provided in both the preheating chamber and the welding chamber. A welding assembly is installed in the welding chamber, with a powder feeding assembly on one side of the welding assembly. A waste heat recovery assembly is installed at the bottom of the welding chamber. This invention achieves spatial separation of the preheating and welding processes by dividing the processing chamber into a preheating chamber and a welding chamber. The preheating chamber preheats the valve and the powder feeding channel, while the welding chamber performs the welding process. Combined with the continuous conveying function of the moving component, continuous valve production can be achieved, effectively improving production efficiency.

Description

Technical Field

[0001] This invention belongs to the field of valve overlay welding technology, specifically, it relates to a valve overlay welding device. Background Technology

[0002] During engine operation, valves undergo high-speed reciprocating motion in a high-temperature environment. The valve disc cone surface is subjected to high-frequency reciprocating impact forces and high-speed airflow scouring under these conditions, making the working environment extremely harsh. This places extremely high demands on the wear resistance and high-temperature resistance of the valve disc cone surface. However, the high-temperature performance of the valve base material cannot meet the actual needs of engine use. Welding, as an economical and efficient technique for material surface modification, has been widely used in the manufacturing and repair of parts in various industrial fields. However, existing welding methods suffer from complex procedures and numerous parameter settings, leading to high requirements for operators and equipment, which in turn results in increased defect rates and reduced production efficiency.

[0003] However, in existing valve welding processes, the preheating and welding processes are generally completed in the same processing chamber. Specifically, after the valve is delivered to the processing chamber, the preheating process is performed before the welding process, resulting in a long welding operation time. Furthermore, the heat generated during the welding process cannot be effectively utilized, especially since the metal powder needs to be preheated during the powder feeding process, which requires additional heat consumption and causes serious energy waste. In addition, this process mode cannot achieve continuous production of valve welding. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a valve overlay welding device.

[0005] To achieve the aforementioned objective, the technical solution adopted by this invention includes: a processing chamber, which is divided into a preheating chamber and a welding chamber. The preheating chamber is used to preheat the valves and powder delivery channels, and the welding chamber is used to perform valve welding. A moving assembly is installed throughout the processing chamber along its length. The moving assembly is equidistantly fixed with clamping plates along its extension direction. The side walls of both the welding chamber and the preheating chamber are provided with clamping slots adapted to the clamping plates, and a rotating clamping mechanism is assembled between adjacent clamping plates. Used to clamp and position valves; the preheating chamber and the welding chamber are also equipped with a drive mechanism. When the two valves enter the preset positions in the preheating chamber and the welding chamber respectively, the drive mechanism engages with the corresponding rotating clamping mechanism to drive the rotating clamping mechanism to drive the valves to rotate synchronously; the welding chamber is equipped with a welding assembly, and a powder feeding assembly is provided on one side of the welding assembly. The bottom of the welding chamber is equipped with a waste heat recovery assembly, and the heat output end of the waste heat recovery assembly extends into the preheating chamber to provide a preheating heat source to the preheating chamber.

[0006] Preferably, in order to facilitate the movement of the rotating clamping mechanism and thus the valve, and to facilitate the movement to the preheating chamber and the welding chamber for preheating and welding processing, continuous processing can be achieved. The moving component includes a guide rail device set in the processing chamber, a guide rail slider slidably fitted on the guide rail device, and the guide rail slider is fixedly connected to the clamping plate.

[0007] Preferably, in order to facilitate clamping and fixing of the valve, and to facilitate subsequent rotation of the valve by the drive mechanism, ensuring sufficient and uniform preheating and welding processing, the rotating clamping mechanism includes a rotating rod disposed on the side walls of two adjacent clamping plates close to each other, with a mounting plate at the end of the rotating rod, and clamping components disposed on the side walls of the two mounting plates close to each other.

[0008] Preferably, to facilitate clamping and fixing the valve, and to facilitate subsequent rotation of the valve by the drive mechanism, ensuring sufficient and uniform preheating and welding, the clamping assembly includes a first electric push rod fixed to the side wall of one of the mounting plates, with a first clamping plate fixed to the output end of the first electric push rod; a second electric push rod fixed to the side wall of the other mounting plate, with a second clamping plate fixed to the output end of the second electric push rod; elastic protective gaskets are fixed to the clamping surfaces of both the first and second clamping plates, wherein the first clamping plate is adapted to the sealing cone end of the valve and used for clamping and positioning, and the second clamping plate is adapted to the stem end face of the valve and used for clamping and positioning.

[0009] Preferably, in order to facilitate the synchronous rotation of the two sets of valves in the welding chamber and the preheating chamber, so as to perform preheating and welding processing simultaneously and ensure sufficient uniformity of processing, the drive mechanism includes a rotating shaft rotatably supported in the preheating chamber and the welding chamber, and a main gear is fixedly mounted on the rotating shaft at equal intervals along its axial direction; a driven gear is fixedly mounted on the outer wall of the mounting plate connected to the first electric push rod, and the driven gear meshes with the main gear; one end of the rotating shaft near the preheating chamber passes through the side wall of the processing chamber and extends to the outside, and is fixedly connected to the output shaft of the drive motor.

[0010] Preferably, in order to ensure stable and secure rotation, a rotating ring is provided on the outside of the rotating shaft, and a support rod is provided at the bottom end of the rotating ring, with the bottom end of the support rod connected to the bottom end of the processing chamber.

[0011] Preferably, in order to facilitate the rotation and angle adjustment of the plasma welding gun on the sealing cone surface according to the sealing cone surface, ensure the optimal welding angle, and guarantee the quality of processing, the welding assembly includes a first fixed plate fixed to the inner wall of the welding chamber, a servo rotation device fixed to the first fixed plate, and a first mounting bracket fixed to the output end of the servo rotation device; a servo angle adjustment device is mounted below the first mounting bracket, a second mounting bracket is fixed to the output end of the servo angle adjustment device, and a sealing cone surface plasma welding gun is fixed to the second mounting bracket; a second fixed plate is also fixed inside the welding chamber, and a rod-shaped plasma welding gun is fixed at equal intervals along its length on the second fixed plate.

[0012] Preferably, in order to facilitate preheating during powder feeding and to cooperate with the sealed conical plasma welding gun and the rod plasma welding gun to complete the surfacing process, the powder feeding assembly includes a fixed frame fixed on one side of the rod plasma welding gun and the sealed conical plasma welding gun. A powder feeding nozzle is fixed on the fixed frame, and a powder feeding channel is connected to the powder feeding nozzle. The powder feeding channel passes through the side walls of the surfacing chamber and the preheating chamber in sequence and extends to the outside of the processing chamber. Argon gas is used as the carrier gas to transport metal powder in the powder feeding channel.

[0013] Preferably, in order to facilitate the recovery of waste heat during the welding process for preheating of the preheating chamber and the utilization of energy, and to preheat both the valve and the powder feeding channel before welding, so as to facilitate subsequent welding operations, improve processing efficiency, and shorten processing time, the waste heat recovery component includes an exhaust pipe fixed at the bottom of the welding chamber, the bottom end of which is connected to a filter box; the end of the filter box away from the exhaust pipe is connected to a blower, the output end of which is connected to a connecting pipe; and preheating outlet pipes are equidistantly connected along the length of the connecting pipe, the top of which extends into the internal space of the preheating chamber.

[0014] Preferably, in order to facilitate the recovery and reuse of argon gas, a recovery pipe is connected to the top of the preheating chamber, which is used to recover the protective argon gas in the preheating chamber.

[0015] Compared with the prior art, the advantages of the present invention include:

[0016] (1) The valve overlay welding device provided by the present invention divides the processing chamber into a preheating chamber and an overlay welding chamber, thereby realizing the spatial separation of the preheating and overlay welding processes. This avoids the problem of prolonged overlay welding time caused by the preheating and overlay welding being completed in the same processing chamber in the traditional process. The preheating chamber preheats the valve and the powder feeding channel, and the overlay welding chamber performs the overlay welding process. With the continuous conveying function of the moving components, the continuous production and processing of valves can be realized, which effectively improves production efficiency.

[0017] (2) The present invention provides a valve overlay welding device, wherein the waste heat recovery component transports the waste heat generated in the overlay welding chamber to the preheating chamber, providing a heat source for the preheating chamber, realizing the recycling of overlay welding waste heat, avoiding the energy waste caused by the additional preheating required during the metal powder feeding process, and reducing the energy consumption of the preheating process, thereby improving energy utilization efficiency.

[0018] (3) The valve overlay welding device provided by the present invention has a rotating clamping mechanism and a driving mechanism designed to allow the valve to rotate synchronously during preheating and overlay welding, ensuring the uniformity of preheating and overlay welding, avoiding processing quality problems caused by uneven local heating, and improving the uniformity and quality stability of the overlay layer.

[0019] (4) The valve overlay welding device provided by the present invention avoids the problem of metal powder agglomeration and blockage caused by low temperature during the powder feeding process through the preheating design of the powder feeding channel. At the same time, the defect of low temperature powder entering the molten pool is easily generated by porosity, thereby improving the stability and quality of the overlay welding process. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the internal structure of a valve overlay welding device according to the present invention;

[0022] Figure 2 This is a schematic diagram of a portion of the processing chamber in a valve overlay welding device according to the present invention;

[0023] Figure 3 This is a partial structural diagram of the welding assembly and powder feeding assembly in a valve welding device according to the present invention.

[0024] Figure 4 This is a schematic diagram of the moving component and rotating clamping mechanism in a valve overlay welding device according to the present invention;

[0025] Figure 5 This is a partial structural diagram of the drive assembly and the rotating clamping mechanism in a valve overlay welding device according to the present invention;

[0026] Figure 6 This is a schematic diagram of the drive assembly in a valve overlay welding device according to the present invention;

[0027] Figure 7 This is a schematic diagram of the waste heat recovery component in a valve overlay welding device according to the present invention.

[0028] Figure label:

[0029] 11. Processing chamber; 12. Preheating chamber; 13. Welding chamber; 14. Recovery pipe; 21. Guide rail device; 22. Slot; 23. Guide rail slider; 24. Clamping plate; 31. Motor; 32. Rotating shaft; 33. Main gear; 34. Rotating ring; 35. Support rod; 36. Driven gear; 41. Mounting plate; 42. Rotating rod; 51. Rod-shaped plasma welding torch; 52. Sealed conical plasma welding torch; 53. First fixing plate; 54. Second... 55. Fixed plate; 56. Servo rotation device; 57. First mounting bracket; 58. Servo angle adjustment device; 59. Second mounting bracket; 60. Air outlet pipe; 61. Filter box; 62. Blower; 63. Connecting pipe; 64. Preheating outlet pipe; 75. Powder feeding nozzle; 76. Powder feeding channel; 77. Fixed bracket; 88. First electric push rod; 89. Second electric push rod; 80. First clamping plate; 81. Second clamping plate; 82. Gasket. Detailed Implementation

[0030] In view of the shortcomings of the prior art, the inventors of this invention, through long-term research and extensive practice, have proposed the technical solution of this invention. The technical solution, its implementation process, and principles will be further explained below with reference to the accompanying drawings and specific implementation examples in the embodiments of this application.

[0031] It should be noted that the embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. The described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, the present invention covers any substitutions, modifications, equivalent methods and solutions made on the spirit, principles and scope of the present invention as defined by the claims. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this application, the terms "first," "second," "third," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," and similar words, do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including," and similar words, mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including," and their equivalents, but do not exclude other elements or objects. The terms "connected" or "linked," and similar words, are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0033] In the description of this application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, when using positional terms such as "both sides," "outer side," and "upper and lower," it should be understood that they are used only for ease of understanding and description, taking into account that the structure may be oriented to other positions.

[0034] In the description of this application, unless otherwise expressly specified and limited, the technical or scientific terms used shall have the ordinary meaning understood by a person with ordinary skills in the art to which this application pertains. Terms such as “installation,” “connection,” and “joining” shall be interpreted broadly, for example, as fixed connection, detachable connection, mating connection, or integral connection. For a person skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0035] The present invention aims to introduce and explain the structural composition of a valve overlay welding device and the matching relationship between the components. Unless otherwise specified, the dimensions, materials and manufacturing processes of the components in the valve overlay welding device in the present invention can be selected according to specific circumstances, and no special limitations or explanations are given here.

[0036] Furthermore, to provide the public with a better understanding of the present invention, certain specific details are described in detail in the following description of the invention. However, those skilled in the art will fully understand the invention even without these detailed descriptions.

[0037] Please see Figures 1-7A valve overlay welding device includes a processing chamber 11, which can be a rectangular sealed cavity, preferably made of 304 stainless steel with a wall thickness of 8-12mm. The interior is divided into a preheating chamber 12 on the left and a welding chamber 13 on the right by a heat-insulating partition. The heat-insulating partition can be filled with a ceramic fiber insulation layer with a thickness of 50-80mm. The preheating chamber 12 is used to preheat the valve and the powder delivery channel 72. The welding chamber 13 is used to perform valve overlay welding. The side wall of the preheating chamber 12 is provided with an observation window, which can be made of high-temperature resistant quartz glass. The side wall of the welding chamber 13 is provided with an inspection door and a welding torch maintenance port. A moving component is installed throughout the processing chamber 11 along its length. The moving component includes a guide rail device 21 installed within the processing chamber 11, on which the guide rail device 21 slides... The guide rail slider 23 is fixedly connected to the clamping plate 24. The guide rail device 21 can be a circular track. Multiple sets of upper guide rail sliders 23 and clamping plates 24 are provided, as shown in the figure. This enables continuous residual heat and welding processing of the valves. The drive device can be driven by a motor 31 or other drive sources. This is a relatively mature technology and will not be elaborated here. The moving component is fixedly provided with clamping plates 24 at equal intervals along its extension direction. The side walls of the welding chamber 13 and the preheating chamber 12 are provided with slots 22 that are adapted to the clamping plates 24. After two adjacent valves enter the preset positions in the preheating chamber 12 and the welding chamber 13 respectively, the clamping plates 24 engage and seal with the corresponding slots 22, without affecting the subsequent... The preheating and welding process is carried out in a welding chamber 13, which is equipped with a welding assembly. The welding assembly includes a first fixed plate 53 fixed to the inner wall of the welding chamber 13. A servo rotating device 55 is fixed on the first fixed plate 53, which mainly includes a servo motor 31 and a planetary reducer. It can rotate and adjust the sealing cone plasma welding torch 52. A first mounting bracket 56 is fixed to the output end of the servo rotating device 55. A servo angle adjustment device 57 is mounted below the first mounting bracket 56. It can mainly be an electric swing table with a rotation angle range of 0-90° to facilitate the adjustment of the tilt angle of the sealing cone plasma welding torch 52, thereby adapting to the valve sealing cone surface to be welded, ensuring the quality and effect of the welding. A second mounting bracket 58 is fixed to the output end of the servo angle adjustment device 57. A sealing cone plasma welding torch 52 is fixed on the mounting bracket 58; a second fixing plate 54 is also fixed in the welding chamber 13, and rod plasma welding torches 51 are fixed at equal intervals along the length of the second fixing plate 54. The number of rod plasma welding torches 51 is one, two or three, and the distribution is set according to the actual length of the valve rod to ensure sufficient and uniform welding. The sealing cone plasma welding torch 52 and the rod plasma welding torch 51 are mainly composed of the torch body, tungsten electrode, nozzle and plasma gas channel. All welding torches are connected to an external plasma welding power source through cables and connected to the control unit of the device through control lines to realize real-time adjustment of welding current and arc voltage. The plasma welding device is a relatively mature technology and will not be described in detail here.

[0038] Please see Figures 1-7 To facilitate simultaneous clamping and positioning of two sets of valves, and to allow them to enter the preheating and welding stations synchronously, enabling synchronized rotation, preheating before welding, and welding after preheating, ensuring welding quality and shortening welding time, a rotating clamping mechanism is installed between two adjacent clamping plates 24. This rotating clamping mechanism is used to clamp and position the valves. A drive mechanism is also installed in the preheating chamber 12 and the welding chamber 13. When the two valves enter their preset positions in the preheating chamber 12 and the welding chamber 13 respectively, the drive mechanism engages with the corresponding rotating clamping mechanism to drive the rotating clamping mechanism to rotate the valves synchronously. The rotating clamping mechanism includes components installed between two adjacent clamping plates 24. 4. Rotating rods 42 are located close to each other on the sidewalls. Rotating rods 42 are rotatably connected to clamping plates 24 via bearings. Mounting plates 41 are provided at the ends of the rotating rods 42. Clamping assemblies are provided on the sidewalls of the two mounting plates 41 that are close to each other. The clamping assemblies include a first electric push rod 81 fixed to the sidewall of one of the mounting plates 41, with a first clamping plate 83 fixed to its output end; a second electric push rod 82 is fixed to the sidewall of the other mounting plate 41, with a second clamping plate 84 fixed to its output end; elastic protective gaskets 85 are fixed to the clamping surfaces of both the first clamping plate 83 and the second clamping plate 84. The first clamping plate 83 is adapted to the sealing cone end of the valve and is used for its clamping and positioning. The two clamping plates 84 are adapted to the valve stem end face and used for clamping and positioning. The inner diameter of the first clamping plate 83 is larger than that of the second clamping plate 84, which facilitates clamping and positioning of the sealing cone end and the stem end face respectively. The elastic protective gasket 85, made of high-temperature resistant silicone with a thickness of 3-5mm, is attached to the arc-shaped inner wall of the first clamping plate 83 and the left side wall of the second clamping plate 84 with high-temperature resistant adhesive to prevent damage to the valve surface during clamping. The drive mechanism includes a rotating shaft 32 rotatably supported in the preheating chamber 12 and the welding chamber 13. A main gear 33 is fixedly fixed on the rotating shaft 32 at equal intervals along its axial direction. A driven gear 36 is fixed on the outer wall of the mounting plate 41 connected to the first electric push rod 81. The axis of the shaft 32 coincides with the axis of the rotating rod 42, and the gear 36 meshes with the main gear 33. One end of the rotating shaft 32 near the preheating chamber 12 passes through the side wall of the processing chamber 11 and extends to the outside, and is fixedly connected to the output shaft of the drive motor 31. A rotating ring 34 is rotatably provided on the outside of the rotating shaft 32. A support rod 35 is provided at the bottom of the rotating ring 34. The bottom end of the support rod 35 is connected to the bottom end of the processing chamber 11. The inner diameter of the rotating ring 34 is slightly larger than the diameter of the rotating shaft 32. It is made of copper alloy and is sleeved on the outside of the rotating shaft 32 through a sliding bearing. The top end of the support rod 35 is welded to the rotating ring 34, and the bottom end is welded to the bottom of the processing chamber 11. It is used to assist in supporting the rotating shaft 32 and prevent the rotating shaft 32 from sagging due to its own weight, which would cause gear meshing deviation.

[0039] Please see Figures 1-7To preheat the metal powder before powder feeding and welding, preventing it from easily agglomerating and clogging the channel, and to avoid porosity caused by low-temperature powder entering the molten pool, the residual heat from the welding process can be utilized for preheating the preheating chamber 12, which can preheat the valves and powder feeding channel 72, shortening processing time, ensuring welding quality, and saving energy. A powder feeding component is provided on one side of the welding assembly, and a residual heat recovery component is installed at the bottom of the welding chamber 13. The heat output end of the residual heat recovery component extends into the preheating chamber 12 to provide a preheating heat source to the preheating chamber 12. The powder feeding component includes a fixing frame 73 fixed on one side of the rod plasma welding gun 51 and the sealing cone plasma welding gun 52, and a powder feeding nozzle 7 is fixed on the fixing frame 73. 1. The powder feeding nozzle 71 is made of stainless steel and is fixed to the mounting bracket 73 by pipe clamps. The distance between the nozzle outlet and the welding torch nozzle is 10-15mm, and the outlet faces the welding area. When welding the conical surface, the nozzle is at an angle of 15°-30° to the generatrix of the conical surface; when welding the end face, the nozzle is at an angle of 45°-60° to the end face. The powder feeding nozzle 71 is connected to a powder feeding channel 72. The inner layer of the powder feeding channel 72 can be a high-temperature ceramic fiber tube, and the outer layer is equipped with a protective sleeve. It is made of stainless steel corrugated pipe, which is wear-resistant, heat-resistant, and can be bent at will. It is a relatively mature technology and will not be described in detail here. The powder feeding channel 72 passes through the side walls of the welding chamber 13 and the preheating chamber 12 and extends to the outside of the processing chamber 11. Argon gas is used as the carrier gas to transport metal powder in the powder feeding channel 72. The powder feeding channel 72 is connected to a powder feeder at one end, which can be a screw-type automatic powder feeder equipped with a hopper for storing alloy powder and a frequency converter motor 31 to control the screw speed. The powder feeder is connected to an argon cylinder via an argon pipeline and is equipped with a pressure reducing valve and a flow meter. Argon gas is used as a carrier gas to push the powder from the powder feeder to the powder feeding channel 72, and finally into the molten pool through the powder feeding nozzle 71. This is a relatively mature technology and will not be described in detail here. The waste heat recovery component includes an exhaust pipe 61 fixed at the bottom of the welding chamber 13. The bottom end of the exhaust pipe 61 is connected to a filter box 62. The end of the filter box 62 away from the exhaust pipe 61 is connected to a blower 63. The output end of the blower 63 is connected to a connecting pipe 64. Preheating outlet pipes 65 are equidistantly connected along the length of the connecting pipe 64. The top of the preheating outlet pipe 65 extends into the internal space of the preheating chamber 12. The filter box 62 is a rectangular box made of 304 stainless steel and has a metal filter screen inside. The side wall of the box has a removable cover for easy replacement of the filter material. The blower 63 can be a centrifugal fan or other blower equipment, which can be connected and fixed by a flange. The preheating outlet pipe 65 is a stainless steel branch pipe, one end of which is connected to the connecting pipe 64, and the other end extends vertically upward through the bottom of the preheating chamber 12 and into the interior of the preheating chamber 12. The pipe opening faces the valve clamping area and is equipped with a wind shield to prevent the airflow from blowing directly on the valve. The preheating chamber 12 is equipped with a temperature sensor connected to the control unit. When the temperature of the preheating chamber 12 is lower than the preset value, such as 200-300℃, the control unit increases the speed of the blower 63.When the temperature exceeds the preset value, the rotation speed is reduced or the heat dissipation valve on the side wall of the preheating chamber 12 is opened to stabilize the preheating temperature. A recovery pipe 14 is connected to the top of the preheating chamber 12. The recovery pipe 14 is used to recover the protective argon gas inside the preheating chamber 12 and is connected to an external argon gas recovery machine. The recovery machine compresses the argon gas inside the preheating chamber 12 using a compressor, stores it in a gas storage tank, and after drying and filtration, returns it to the welding torch shielding gas channel, thus achieving argon gas recycling.

[0040] Working principle: The operator places the valve to be welded into the rotating clamping mechanism between adjacent clamping plates 24 through the feeding port of the preheating chamber 12. The first electric push rod 81 is activated, causing the first clamping plate 83 to fit against the valve sealing cone surface. The second electric push rod 82 is activated, causing the second clamping plate 84 to press against the valve stem end face. The elastic protective gasket 85 prevents damage to the valve surface. The guide rail device 21, in conjunction with the guide rail slider 23, drives the clamping plate 24 to move the valve into the preheating chamber 12. The waste heat recovery component is activated, and the high-temperature waste heat of the welding chamber 13 enters the filter box 62 through the air outlet pipe 61. After filtration, it is pushed by the blower device 63 to the preheating outlet pipe 65, delivering hot air to the preheating chamber 12. The drive mechanism is activated, and the rotating shaft 32 drives the main gear 33 to rotate. The main gear 33 meshes with the driven gear 36 of the rotating clamping mechanism to drive the valve to rotate at a constant speed. At the same time, the section of the powder feeding channel 72 placed in the preheating chamber 12 is preheated synchronously to prevent powder agglomeration. Preheating is completed. Afterwards, the moving component drives the card plate 24 to transfer the preheated valve to the preset station in the welding chamber 13. At the same time, the next valve to be welded enters the preheating chamber 12 to start preheating, and the two stations work synchronously. The drive mechanism of the welding chamber 13 is started, and the rotating shaft 32 drives the main gear 33 to rotate. The main gear 33 meshes with the driven gear 36 of the rotating clamping mechanism, driving the valve to rotate at a constant speed. The plasma welding power supply and powder feeding component are started: the tungsten electrode of the sealing cone plasma welding gun 52 generates a plasma arc to melt the surface layer of the valve sealing cone. The powder feeder is started, and argon gas is used as the carrier gas to send cobalt-based alloy powder into the molten pool through the preheated powder feeding channel 72 and the powder feeding nozzle 71. The servo rotation device 55 drives the sealing cone plasma welding gun 52 to rotate slowly, and the servo angle adjustment device 57 adjusts the angle of the sealing cone plasma welding gun 52 in real time. At the same time, the rod plasma welding gun 51 can simultaneously weld the rod and the sealing cone to ensure that the thickness of the weld layer is uniform.

[0041] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It should not be considered that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A valve overlay welding device, characterized in that: The system includes a processing chamber (11), which is divided into a preheating chamber (12) and a welding chamber (13). The preheating chamber (12) is used to preheat the valves and the powder delivery channel (72), and the welding chamber (13) is used to perform valve welding. A moving assembly is installed throughout the processing chamber (11) along its length. The moving assembly is fixed with clamping plates (24) at equal intervals along its extension direction. The side walls of the welding chamber (13) and the preheating chamber (12) are provided with clamping slots (22) that are compatible with the clamping plates (24). A rotating clamping mechanism is assembled between two adjacent clamping plates (24). The mechanism is used to clamp and position the valves; the preheating chamber (12) and the welding chamber (13) are also equipped with a drive mechanism. When the two valves enter the preset positions of the preheating chamber (12) and the welding chamber (13) respectively, the drive mechanism is engaged with the corresponding rotating clamping mechanism to drive the rotating clamping mechanism to drive the valves to rotate synchronously; the welding chamber (13) is equipped with a welding assembly. A powder feeding assembly is provided on one side of the welding assembly. A waste heat recovery assembly is installed at the bottom of the welding chamber (13). The heat output end of the waste heat recovery assembly extends into the preheating chamber (12) to provide a preheating heat source to the preheating chamber (12).

2. The valve overlay welding device according to claim 1, characterized in that: The moving component includes a guide rail device (21) disposed in the processing chamber (11), a guide rail slider (23) slidably fitted on the guide rail device (21), and the guide rail slider (23) being fixedly connected to the clamping plate (24).

3. The valve overlay welding device according to claim 2, characterized in that: The rotating clamping mechanism includes a rotating rod (42) disposed on the side walls of two adjacent clamping plates (24) close to each other. The end of the rotating rod (42) is provided with a mounting plate (41), and the side walls of the two mounting plates (41) close to each other are provided with clamping components.

4. The valve overlay welding device according to claim 3, characterized in that: The clamping assembly includes a first electric push rod (81) fixed on the side wall of one of the mounting plates (41), and a first clamping plate (83) fixed at the output end of the first electric push rod (81); a second electric push rod (82) fixed on the side wall of the other mounting plate (41), and a second clamping plate (84) fixed at the output end of the second electric push rod (82); elastic protective pads (85) are fixed on the clamping surfaces of the first clamping plate (83) and the second clamping plate (84), wherein the first clamping plate (83) is adapted to the sealing cone end of the valve and used for clamping and positioning, and the second clamping plate (84) is adapted to the stem end face of the valve and used for clamping and positioning.

5. The valve overlay welding device according to claim 4, characterized in that: The drive mechanism includes a rotating shaft (32) rotatably supported in the preheating chamber (12) and the welding chamber (13), and a main gear (33) is fixedly mounted on the rotating shaft (32) at equal intervals along its axial direction; a driven gear (36) is fixedly mounted on the outer wall of the mounting plate (41) connected to the first electric push rod (81), and the driven gear (36) meshes with the main gear (33); one end of the rotating shaft (32) near the preheating chamber (12) passes through the side wall of the processing chamber (11) and extends to the outside, and is fixedly connected to the output shaft of the drive motor (31).

6. The valve overlay welding device according to claim 5, characterized in that: The rotating shaft (32) is externally rotatably provided with a rotating ring (34), and a support rod (35) is provided at the bottom end of the rotating ring (34). The bottom end of the support rod (35) is connected to the bottom end of the processing chamber (11).

7. A valve overlay welding apparatus according to claim 1 or 6, characterized in that: The overlay assembly includes a first fixed plate (53) fixed on the inner wall of the overlay chamber (13), a servo rotating device (55) fixed on the first fixed plate (53), and a first mounting bracket (56) fixed on the output end of the servo rotating device (55); a servo angle adjusting device (57) is mounted below the first mounting bracket (56), and a second mounting bracket (58) is fixed on the output end of the servo angle adjusting device (57), and a sealing cone plasma welding gun (52) is fixed on the second mounting bracket (58); a second fixed plate (54) is also fixed inside the overlay chamber (13), and a rod-shaped plasma welding gun (51) is fixed at equal intervals along its length on the second fixed plate (54).

8. The valve overlay welding device according to claim 7, characterized in that: The powder feeding assembly includes a fixed frame (73) fixed on one side of the rod plasma welding gun (51) and the sealing cone plasma welding gun (52). A powder feeding nozzle (71) is fixed on the fixed frame (73), and a powder feeding channel (72) is connected to the powder feeding nozzle (71). The powder feeding channel (72) passes through the side wall of the welding chamber (13) and the preheating chamber (12) in sequence and extends to the outside of the processing chamber (11). Argon gas is used as the carrier gas to transport metal powder in the powder feeding channel (72).

9. A valve overlay welding device according to claim 8, characterized in that: The waste heat recovery assembly includes an exhaust pipe (61) fixed at the bottom of the welding chamber (13), the bottom end of which is connected to a filter box (62); the end of the filter box (62) away from the exhaust pipe (61) is connected to a blower (63), the output end of the blower (63) is connected to a connecting pipe (64); preheating exhaust pipes (65) are equidistantly connected along the length of the connecting pipe (64), the top end of which extends into the internal space of the preheating chamber (12).

10. A valve overlay welding device according to claim 9, characterized in that: The top of the preheating chamber (12) is connected to a recovery pipe (14), which is used to recover the protective argon gas in the preheating chamber (12).

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