A four-way valve cover welding jig and welding method

Abstract

This invention provides a welding fixture for a four-way valve cover, including a base, a first fixed seat, a second fixed seat mounted on the base, and a detection device. The detection device is movably connected to the base, allowing it to rotate around the first fixed seat. The height of the detection device corresponds to the top surface of the first fixed seat, enabling the detection range to completely cover the annular side above the first fixed seat during rotation. A welding method for the four-way valve cover corresponding to the above fixture is also proposed. This invention uses an ultrasonic detector to detect the gap width of the welding surface to precisely adjust the gap size, avoiding errors present in manual visual observation or measurement adjustments, thus improving welding quality. The ultrasonic detector moves along a guide rail and rotates 360° to detect the welding surface, preventing unevenness in the welding surface from causing insufficient gaps, which can hinder flux and welding wire entry and affect welding quality.

Description

Technical Field

[0001] This invention relates to the field of valve assembly tooling technology, and in particular to a welding fixture and welding method for a four-way valve cover. Background Technology

[0002] A four-way valve is a control valve with four ports, each connecting to one of four fluid lines. The valve core of a four-way valve typically has two unconnected fluid passages on the same plane, each connected to one of the four ports. A four-way valve can simultaneously control the flow of four fluid lines, controlling the direction of the fluid medium in the lines. The use of a four-way valve saves the number of two-way valves required, reducing the manufacturing cost of process piping.

[0003] Four-way valves are also indispensable components in refrigeration equipment. They form refrigeration and heating cycles through the cooperation of coils and compression springs, allowing the refrigerant to achieve different working requirements through different circulation modes. This type of four-way valve has a relatively special structure. For example, Chinese invention patent CN200910135102.3 provides a four-way valve with a simple structure that can suppress heat loss caused by heat leakage between high-temperature and low-temperature refrigerants even when they flow close to each other. Its valve body has a strip-shaped structure, with one valve port located on one side of the valve body and the other three valve ports arranged side by side on the opposite side.

[0004] During the production of this four-way valve, after the valve body and valve cover are formed, they need to be welded together to facilitate fixing and connecting the valve body via the valve cover. During the welding process, a certain gap is usually left between the weld surfaces. This gap allows the weld, flux, and welding wire to shrink and deform freely, while reducing stress and deformation caused by thermal deformation. It also allows the welding wire or flux to deposit fully and reduces the formation of voids and pores.

[0005] However, since the thickness of the welded surfaces is different when the valve body and valve cover are welded, the gaps that need to be left between the welded surfaces are also different. Moreover, the gaps that need to be left between the welded surfaces are usually small. Therefore, in the existing technology, they are generally determined by visual observation or manual measurement with a ruler. However, the flatness between the welded surfaces of some valve bodies and valve covers is poor, which makes it easier for the weld to be too wide or too narrow when the weld is welded, resulting in uneven solder input and affecting the welding effect. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a welding fixture and welding method for a four-way valve cover. This method solves the problem that existing technologies generally rely on visual observation or manual measurement to determine the flatness of the welding surfaces between the valve body and the valve cover. Consequently, the weld seam may be too wide or too narrow during welding, leading to uneven solder application and affecting the welding effect.

[0007] In a first aspect, the present invention provides a welding fixture for a four-way valve cover, comprising a base, a first fixing seat, a second fixing seat disposed on the base, and a detection device;

[0008] The first fixed seat is movably mounted on the base surface. The first fixed seat is used to clamp the four-way valve body. A driving device is provided at the bottom of the first fixed seat to drive it to move in the vertical direction.

[0009] The second fixed seat is mounted above the first fixed seat via a bracket. The second fixed seat is used to clamp the four-way valve cover. The bracket is a movable structure that can drive the second fixed seat to move in the horizontal and vertical directions respectively.

[0010] The detection device is movably connected to the base, allowing it to rotate around the first fixed seat. The height of the detection device corresponds to the position of the top surface of the first fixed seat, so that the detection range of the detection device can completely cover the annular side above the first fixed seat through the rotation process.

[0011] Furthermore, the first fixing seat includes a mounting ring, which is a vertically arranged circular ring structure. A connector is coaxially arranged at the center of the mounting ring to fix the four-way valve body. Two horizontal clamping plates are arranged on both sides above the connector. The clamping plates are symmetrically arranged along the axis relative to the central axis of the mounting ring, and the clamping plates can move synchronously relative to each other to adjust the distance between the clamping plates.

[0012] Furthermore, the bottom of the mounting ring is provided with two slide rails, which are parallel to the clamping plate. Several horizontal support rods are installed between the slide rails. The support rods are perpendicular to the slide rails and are movably arranged with the slide rails, so that the support rods can move horizontally along the slide rails.

[0013] Furthermore, the connector includes a vertically arranged limiting cylinder, which is coaxially positioned at the center of the mounting ring. Several adjusting plates are arranged circumferentially inside the limiting cylinder. Each adjusting plate includes a vertical section and an inclined section. One end of the inclined section is rotatably connected to the inside of the limiting cylinder, and the other end is rotatably connected to the vertical section. Several springs are arranged on the side of the vertical section near the inner wall of the limiting cylinder, and the springs are evenly spaced along the vertical direction.

[0014] Furthermore, the bracket includes a mounting frame horizontally positioned above the first fixed seat, the second fixed seat being positioned in the middle of the mounting frame, and a plurality of first telescopic rods being provided along the edge of the mounting frame, the first telescopic rods controlling the vertical movement of the mounting frame.

[0015] Furthermore, the mounting frame is provided with an adapter sleeve, which is vertically arranged. The mounting frame is also provided with two parallel adjusting rods, which horizontally penetrate the side wall of the adapter sleeve. One adjusting rod is slidably connected to the adapter sleeve, and the other adjusting rod is threaded to the adapter sleeve to achieve a lead screw connection. When the adjusting rod rotates, it drives the adapter sleeve to move along the direction of the adjusting rod.

[0016] Furthermore, the second fixing seat includes a vertically arranged fixing sleeve, which is a hollow cylindrical structure. The fixing sleeve is rotatably installed inside the adapter sleeve and can only rotate, but cannot move vertically along the axial direction.

[0017] The fixed sleeve is provided with a plurality of second telescopic rods arranged around its interior. The second telescopic rods are arranged radially along the fixed sleeve. One end of the second telescopic rod is connected to the inner wall of the fixed sleeve, and the other end is provided with a pressing piece.

[0018] Furthermore, one end face of the fixed sleeve extends outside the adapter sleeve, and a driven gear is arranged around the outer side of the end face. A motor is installed on the corresponding end face of the adapter sleeve, and a drive gear is provided at the output end of the motor. The drive gear meshes with the driven gear, thereby controlling the rotation of the driven gear and the fixed sleeve.

[0019] Furthermore, the detection device includes a horizontal guide rail mounted on the base. The guide rail is an annular structure surrounding the first fixed seat. A slider is provided on the guide rail, and the slider can move freely along the guide rail. A vertical mounting platform is provided on the slider. The top of the mounting platform extends to the surface of the first fixed seat. An ultrasonic detector is provided at the top of the mounting platform. The detection direction of the ultrasonic detector is along the radial direction of the guide rail and passes above the center position of the first fixed seat.

[0020] Secondly, the present invention also proposes a method for welding the valve cover of a four-way valve, comprising the following steps:

[0021] S1. Install the valve body on the first fixed seat and the valve cover on the second fixed seat. Adjust the horizontal position of the second fixed seat so that the valve body and the valve cover are vertically aligned. Then drive the second fixed seat to move downward so that the welding surfaces of the valve cover and the valve body are in close contact.

[0022] S2. Turn on the ultrasonic detector, and then slowly adjust the second fixed base to move upward until the gap width detected by the ultrasonic detector is exactly the same as the required welding gap width.

[0023] S3. Rotate the ultrasonic detector 360° around the first fixed base. If the gap width detected by the ultrasonic detector meets the welding standard, welding can begin. If the ultrasonic detector cannot detect the gap within a certain range of curvature or the gap is much smaller than the welding gap width, rotate the second fixed base and adjust the angle of the contact surface between the valve body and the valve cover. Perform a 360° rotation test of the ultrasonic detector every time the angle is adjusted until the gap width meets the standard.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] In this invention, the valve body is mounted on a first fixed seat, and the valve cover is mounted on a second fixed seat, ensuring that the valve body and valve cover are vertically aligned. Simultaneously, the movement of the second fixed seat is controlled to bring the welding surfaces of the valve cover and valve body closer together, leaving a gap sufficient to allow for the free contraction and deformation of materials such as weld seam, flux, and welding wire. Meanwhile, an ultrasonic detector in the detection device emits ultrasonic waves that pass through the gap between the valve cover and valve body. When the ultrasonic waves encounter the gap, some energy is reflected back. The time and amplitude of the reflected energy reflect the depth and size of the gap, thus detecting the width of the welding gap. In use, by adjusting the distance between the valve body and valve cover, the gap size is precisely adjusted until the width of the gap detected by the ultrasonic detector is exactly equal to the preset welding gap width. This avoids errors inherent in manual visual observation or measurement adjustments, improving welding quality.

[0026] In addition, the ultrasonic detector in this invention is mounted on the slider via a mounting platform and moves along the guide rail with the slider. During the movement, since the connecting line between the sliders is always radial, the ultrasonic waves emitted by the ultrasonic detector are emitted to the welding surface from various angles. This allows for 360° rotation to inspect the welding surface, avoiding the problem that uneven welding surfaces can cause gaps to be too small, making it difficult for flux and welding wire to enter, thus affecting the welding quality. Attached Figure Description

[0027] Figure 1 This is a side view of an embodiment of the present invention.

[0028] Figure 2 This is a top view of the first fixed base in an embodiment of the present invention.

[0029] Figure 3 This is a schematic diagram of the axial cross-section of the connector in an embodiment of the present invention.

[0030] Figure 4 This is a top view of the bracket and the second fixing seat in an embodiment of the present invention.

[0031] Figure 5This is a top view of the fixing sleeve in an embodiment of the present invention.

[0032] Figure 6 This is a schematic diagram of the detection device in an embodiment of the present invention.

[0033] In the above attached figures: 1. Base; 2. First fixed seat; 3. Second fixed seat; 4. Guide rail; 5. Mounting platform; 6. Ultrasonic detector; 7. Adapter sleeve; 11. Hydraulic telescopic rod; 12. Mounting frame; 13. First telescopic rod; 21. Mounting ring; 22. Connector; 23. Clamping plate; 24. Third telescopic rod; 25. Slide rail; 26. Support rod; 31. Second telescopic rod; 32. Pressing plate; 41. Slider; 71. Motor; 121. Adjusting rod; 221. Limiting cylinder; 222. Adjusting plate; 223. Spring.

[0034] The dashed lines in the diagram represent structures that are obscured at the bottom. Detailed Implementation

[0035] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] like Figure 1 As shown in the figure, this invention provides a welding fixture and welding method for a four-way valve cover, including a base 1, a first fixed seat 2 and a second fixed seat 3 disposed on the base 1, and a detection device. The first fixed seat 2 is movably disposed on the surface of the base 1 and is used to clamp the four-way valve body. A driving device is provided at the bottom of the first fixed seat 2 to drive it to move in the vertical direction. The second fixed seat 3 is mounted above the first fixed seat 2 by a bracket and is used to clamp the four-way valve cover. The bracket is a movable structure that can drive the second fixed seat 3 to move in the horizontal and vertical directions respectively.

[0037] The valve body is mounted on the first fixed seat 2, and the valve cover is mounted on the second fixed seat 3, so that the valve body and valve cover are positioned vertically correspondingly. By controlling the movement of the second fixed seat 3, the welding surfaces of the valve cover and valve body can be brought closer together while leaving a gap to allow the weld, flux, and welding wire to freely shrink and deform. The detection device is movably connected to the base 1, allowing it to rotate around the first fixed seat 2. The height of the detection device corresponds to the top surface of the first fixed seat 2, so that the detection range of the detection device completely covers the annular side above the first fixed seat during the rotation process.

[0038] like Figure 2As shown, preferably, the detection device includes a horizontal guide rail 4 mounted on the base 1. The guide rail 4 is an annular structure surrounding the first fixed seat 2. A slider 41 is mounted on the guide rail 4, and the slider 41 can move freely along the guide rail 4. A vertical mounting platform 5 is mounted on the slider 41, and the top of the mounting platform 5 extends to the surface of the first fixed seat 2. An ultrasonic detector 6 is mounted on the top of the mounting platform 5. The ultrasonic waves emitted by the ultrasonic detector 6 are radially along the guide rail 4 and pass above the center of the first fixed seat 2. The ultrasonic detector 6 can directly detect the width of the welding gap. By adjusting the distance between the valve body and the valve cover, when the width of the gap detected by the ultrasonic detector 6 is exactly equal to the preset welding gap width, the gap size is precisely adjusted. This avoids errors that exist in manual visual observation or measurement and adjustment, and improves the welding quality.

[0039] like Figure 3 As shown, in the specific design, the base 1 is a horizontal plate-like structure, and the first fixed base 2 includes a mounting ring 21. The mounting ring 21 is a vertically arranged circular ring structure. Four equally spaced hydraulic telescopic rods 11 are provided at the bottom of the mounting ring 21, thereby driving the mounting ring 21 to move vertically. A connector 22 is coaxially arranged at the center of the mounting ring 21 to fix the four-way valve body. Figure 4 As shown, preferably, the connector 22 includes a vertically arranged limiting cylinder 221, which is coaxially positioned at the center of the mounting ring 21. Several adjusting plates 222 are arranged circumferentially inside the limiting cylinder 221. Each adjusting plate 222 includes a vertical section and an inclined section. One end of the inclined section is rotatably connected to the inside of the limiting cylinder 221, and the other end is rotatably connected to the vertical section. Several springs 223 are arranged on the side of the vertical section near the inner wall of the limiting cylinder 221, and the springs 223 are evenly spaced along the vertical direction. When one of the valve ports of the valve body is inserted into the limiting cylinder 221, it first abuts against the inclined section, then slides downwards along the inclined section, pressing the vertical section towards the inner wall of the limiting cylinder 221. Finally, the elastic force applied to the vertical section by the springs 223 fixes the valve body, preventing it from moving horizontally.

[0040] Two horizontal clamping plates 23 are respectively arranged on both sides above the connector 22. The clamping plates 23 are symmetrically arranged along the central axis relative to the mounting ring 21, and the clamping plates 23 can move synchronously relative to each other, thereby adjusting the distance between the clamping plates 23. In this embodiment, a horizontally arranged third telescopic rod 24 is used to control the movement of the clamping plates 23. When one valve port of the valve body is inserted into the limiting cylinder 221, the valve body cannot move horizontally. At this time, the clamping plates 23 clamp the valve body, preventing it from rotating, thus completing the clamping and fixing of the valve body.

[0041] In a further embodiment, the bottom of the mounting ring 21 is provided with two slide rails 25, which are parallel to the clamping plate 23. Several horizontal support rods 26 are installed between the slide rails 25, and these support rods 26 are perpendicular to and movable along the slide rails 25, allowing them to move horizontally along the slide rails 25. Because the four-way valve of this invention has three parallel valve ports on one side, if only one of the valve ports needs to be welded, inserting it into the limiting cylinder 221 will result in a significant asymmetry in the center of gravity on the other side, easily leading to tilting. Therefore, the position of the support rods 26 can be adjusted using the slide rails 25 to precisely position them between adjacent valve ports, supporting the entire valve and preventing tilting that could affect the clamping effect.

[0042] Traditional valve bodies are straight or T-shaped pipes, which can be fixed using a suitable mounting slot. However, for this four-way valve, due to its different construction, it is difficult to manufacture a suitable mounting slot that can simultaneously fix the valve ports on both sides of the four-way valve upwards and align them with the valve cover above. Furthermore, fixing the valve body using a mounting slot is only suitable for valve bodies of a single size, not for different sizes. This results in each size valve requiring a separate clamp, making it cumbersome and increasing equipment costs. This invention, through the structure of the first fixing seat 2, can effectively fix either a single valve port on each side of the four-way valve or all three parallel valve ports. Simultaneously, the cooperation of the internal spring 223 and the clamping plate 23 of the clamping component allows for clamping of valve bodies of different sizes, thus having a wider range of applications.

[0043] like Figure 5 As shown, in an embodiment of the present invention, the bracket includes a mounting frame 12 horizontally disposed above the first fixed seat 2, the second fixed seat 3 disposed in the middle of the mounting frame 12, and a plurality of first telescopic rods 13 disposed on the edge of the mounting frame 12. The first telescopic rods 13 control the mounting frame 12 to move in the vertical direction, thereby adjusting the width of the gap between the valve body and the valve cover.

[0044] Furthermore, the mounting frame 12 is provided with an adapter sleeve 7, which is vertically arranged. The mounting frame 12 also has two parallel adjusting rods 121, which horizontally penetrate the side wall of the adapter sleeve 7. One adjusting rod 121 is slidably connected to the adapter sleeve 7, and the other adjusting rod 121 is threadedly connected to the adapter sleeve 7. When the adjusting rod 121 rotates, it drives the adapter sleeve 7 to move along the direction of the adjusting rod 121. Since the four-way valve used for clamping in this invention has three parallel valve ports on one side, when it is necessary to weld the valve body and valve cover corresponding to these three valve ports, the movement of the adapter sleeve 7 can be controlled by the adjusting rod 121, causing the second fixed seat 3 to move above the corresponding valve port, and then move vertically.

[0045] like Figure 6 As shown, in the specific solution, six second telescopic rods 31 are arranged around the inside of the fixed sleeve. It should be noted that in this embodiment, the first telescopic rod 13, the second telescopic rod 31, and the third telescopic rod 24 are all electrically telescopic structures. Since their principle is existing technology, it will not be described in detail in this embodiment. The second telescopic rod 31 is arranged radially along the fixed sleeve. One end of the second telescopic rod 31 is connected to the inner wall of the fixed sleeve, and the other end is provided with a pressing piece 32. By simultaneously extending and retracting the second telescopic rod 31, the pressing piece 32 is controlled to abut against the outer side of the valve cover, thereby fixing the valve cover inside the fixed sleeve. The pressing piece 32 can be made of flexible silicone material, which has excellent friction coefficient and good flexibility, and can be tightly attached to the surface of the valve cover for fixing.

[0046] In this invention, the ultrasonic detector 6 is mounted on the slider 41 via the mounting platform 5 and moves along the guide rail 4 with the slider 41. During the movement, since the connecting line between the sliders 41 is always radial, the ultrasonic waves emitted by the ultrasonic detector 6 are always directed toward the gap between the welding surfaces of the valve body and the valve cover. This allows for 360° rotation to inspect the welding surface, avoiding the problem that uneven welding surfaces can cause gaps to be too small, making it difficult for flux and welding wire to enter, thus affecting the welding quality.

[0047] Corresponding to the above structure, in this embodiment, the second fixing seat 3 includes a vertically arranged fixing sleeve. The fixing sleeve is a hollow cylindrical structure, rotatably installed inside the adapter sleeve 7, and can only rotate, not move vertically along the axial direction. One end face of the fixing sleeve extends out of the adapter sleeve 7, and a driven gear is arranged around the outer side of this end face. A motor 71 is installed on the corresponding end face of the adapter sleeve 7, and a drive gear is provided at the output end of the motor 71. The drive gear meshes with the driven gear, thereby controlling the rotation of the driven gear and the fixing sleeve. This allows the valve cover to rotate axially relative to the valve body, adjusting the relative angle of the welding surfaces. When the welding gap is too small due to uneven welding surfaces, it can be adjusted by rotating the valve cover, so that the protruding points and concave points of the valve body and valve cover on the welding surface match, making the width of the gap on the welding surface more uniform, and correspondingly improving the welding quality.

[0048] The welding method for the four-way valve cover using the above-mentioned fixture in this embodiment of the invention includes the following steps:

[0049] (1) Install the valve body on the first fixed seat 2 and the valve cover on the second fixed seat 3. Adjust the horizontal position of the second fixed seat 3 so that the valve body and the valve cover are vertically aligned. Then drive the second fixed seat 3 to move downward so that the welding surfaces of the valve cover and the valve body are in close contact.

[0050] (2) Turn on the ultrasonic detector 6, and then slowly adjust the second fixed base 3 to move upward until the gap width detected by the ultrasonic detector 6 is exactly the same as the required welding gap width.

[0051] (3) Rotate the ultrasonic detector 6 around the first fixed base 2 by 360°. If the gap width detected by the ultrasonic detector 6 meets the welding standard, the welding process can begin. If the ultrasonic detector 6 cannot detect the gap within a certain range of arc or the gap is much smaller than the welding gap width, rotate the second fixed base 3 and adjust the angle of the contact surface between the valve body and the valve cover. Perform a 360° rotation test of the ultrasonic detector 6 every time the angle is adjusted until the gap width test meets the standard.

[0052] It should be noted that the standard for gap detection can be determined manually based on the welding precision requirements. For example, when the ultrasonic detector 6 rotates 360°, the angle range in which the detected gap width is not equal to the target welding gap width is not greater than 10°.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A welding fixture for a four-way valve cover, characterized in that: It includes a base, a first fixing seat and a second fixing seat mounted on the base, and a detection device; The first fixed seat is movably mounted on the base surface. The first fixed seat is used to clamp the four-way valve body. A driving device is provided at the bottom of the first fixed seat to drive it to move in the vertical direction. The second fixed seat is mounted above the first fixed seat via a bracket. The second fixed seat is used to clamp the four-way valve cover. The bracket is a movable structure that can drive the second fixed seat to move in the horizontal and vertical directions respectively. The detection device is movably connected to the base, allowing it to rotate around the first fixed seat. The height of the detection device corresponds to the position of the top surface of the first fixed seat, so that the detection range can completely cover the annular side above the first fixed seat through the rotation process. The first fixing base includes a mounting ring, which is a vertically arranged circular ring structure. A connector is coaxially arranged at the center of the mounting ring to fix the four-way valve body. Two horizontal clamping plates are arranged on both sides above the connector. The clamping plates are symmetrically arranged along the axis relative to the central axis of the mounting ring, and the clamping plates can move synchronously relative to each other to adjust the distance between the clamping plates. The detection device includes a horizontal guide rail mounted on a base. The guide rail is an annular structure surrounding a first fixed seat. A slider is mounted on the guide rail and can move freely along the guide rail. A vertical mounting platform is mounted on the slider. The top of the mounting platform extends to the surface of the first fixed seat. An ultrasonic detector is mounted on the top of the mounting platform. The detection direction of the ultrasonic detector is along the radial direction of the guide rail and passes above the center position of the first fixed seat. The connector includes a vertically arranged limiting cylinder, which is coaxially positioned at the center of the mounting ring. Several adjusting plates are arranged circumferentially inside the limiting cylinder. Each adjusting plate includes a vertical section and an inclined section. One end of the inclined section is rotatably connected to the inside of the limiting cylinder, and the other end is rotatably connected to the vertical section. Several springs are arranged on the side of the vertical section near the inner wall of the limiting cylinder, and the springs are evenly spaced along the vertical direction.

2. The four-way valve cover welding fixture as described in claim 1, characterized in that: The bottom of the mounting ring is also provided with two slide rails, which are parallel to the clamping plate. Several horizontal support rods are installed between the slide rails. The support rods are perpendicular to the slide rails and are movably arranged with the slide rails, so that the support rods can move horizontally along the slide rails.

3. The four-way valve cover welding fixture as described in claim 1, characterized in that: The bracket includes a mounting frame horizontally positioned above a first fixed seat, a second fixed seat positioned in the middle of the mounting frame, and a plurality of first telescopic rods along the edge of the mounting frame, the first telescopic rods controlling the vertical movement of the mounting frame.

4. The four-way valve cover welding fixture as described in claim 3, characterized in that: The mounting frame is equipped with an adapter sleeve, which is vertically arranged. The mounting frame is also equipped with two parallel adjusting rods, which horizontally penetrate the side wall of the adapter sleeve. One adjusting rod is slidably connected to the adapter sleeve, and the other adjusting rod is threaded to the adapter sleeve to achieve a lead screw connection. When the adjusting rod rotates, it drives the adapter sleeve to move along the direction of the adjusting rod.

5. The four-way valve cover welding fixture as described in claim 4, characterized in that: The second fixing base includes a vertically arranged fixing sleeve, which is a hollow cylindrical structure. The fixing sleeve is rotatably installed inside the adapter sleeve and can only rotate, but cannot move vertically along the axial direction. The fixed sleeve is provided with a plurality of second telescopic rods arranged around its interior. The second telescopic rods are arranged radially along the fixed sleeve. One end of the second telescopic rod is connected to the inner wall of the fixed sleeve, and the other end is provided with a pressing piece.

6. The four-way valve cover welding fixture as described in claim 5, characterized in that: One end face of the fixed sleeve extends outside the adapter sleeve, and a driven gear is arranged around the outer side of the end face. A motor is installed on the corresponding end face of the adapter sleeve, and a drive gear is provided at the output end of the motor. The drive gear meshes with the driven gear, thereby controlling the rotation of the driven gear and the fixed sleeve.

7. A method for welding a four-way valve cover using the welding fixture of claim 1, characterized in that, Includes the following steps: S1. Install the valve body on the first fixed seat and the valve cover on the second fixed seat. Adjust the horizontal position of the second fixed seat so that the valve body and the valve cover are vertically aligned. Then drive the second fixed seat to move downward so that the welding surfaces of the valve cover and the valve body are in close contact. S2. Turn on the ultrasonic detector, and then slowly adjust the second fixed base to move upward until the gap width detected by the ultrasonic detector is exactly the same as the required welding gap width. S3. Rotate the ultrasonic detector 360° around the first fixed base. If the gap width detected by the ultrasonic detector meets the welding standard, welding can begin. If the ultrasonic detector cannot detect the gap within a certain range of curvature or the gap is much smaller than the welding gap width, rotate the second fixed base and adjust the angle of the contact surface between the valve body and the valve cover. Perform a 360° rotation test of the ultrasonic detector every time the angle is adjusted until the gap width meets the standard.

Images