A welding clamping device and clamping method for a butterfly valve rocker arm support

Abstract

The present application belongs to the field of aeronautical mechanical engineering technology, and relates to a welding clamping device and clamping method for a butterfly valve rocker arm support, which comprises a base, a pressing plate, a cushion block, a pin rod and a V-shaped stopper. The cushion block is fixed on the base to support the free end of the rocker arm support to be welded, and thin walls are arranged on both sides of the cushion block to clamp the two sides of the free end of the rocker arm support to be welded. The rocker arm to be welded and the rocker arm support are placed in an up-down manner and are pressed by the pressing plate. The arc surfaces of the rocker arm to be welded and the rocker arm support are simultaneously in close contact with the V-shaped groove of the V-shaped stopper, and the pressing state is maintained by the inner pin rod. The lower end surface of the rocker arm to be welded is installed in the groove at the bottom of the base, and the free end plane of the rocker arm support is placed on the upper surface of the boss in the middle of the cushion block. The present application can realize one-time precise forming without secondary processing after welding, greatly shortens the processing time, and ensures the accurate control of the output flow by the rocker arm support assembly driving the butterfly valve.

Description

Technical Field

[0001] This invention belongs to the field of aerospace mechanical engineering technology, and relates to a welding device and clamping method for a precision butterfly valve rocker arm bracket assembly. Background Technology

[0002] In a servo valve control system, a butterfly valve that controls flow is fixed on a rocker arm bracket. The rocker arm is then driven by a motor to rotate around a pivot, thereby achieving precise control of the butterfly valve opening. The rocker arm and the rocker arm bracket need to maintain a very high degree of symmetry and parallelism to achieve precise flow control.

[0003] In the manufacturing process of butterfly valves, the rocker arm and rocker arm bracket are usually fixed together by welding. The quality of the weld directly affects the valve's tilting performance, so it is necessary to ensure the strength and reliability of the welded components, as well as the positional accuracy between the rocker arm and bracket. Currently, the focus of welding the rocker arm and bracket is on the strength and reliability of the welded components, which fails to guarantee the positional accuracy between them. This necessitates secondary processing of the rocker arm and bracket assembly after welding to ensure overall dimensional and positional tolerances, resulting in long processing steps, inconvenient secondary processing, and high costs. Therefore, designing a welding device for precision butterfly valve rocker arm and bracket assemblies is essential. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a welding device for a precision butterfly valve rocker arm bracket assembly, thereby meeting the design requirements for efficient and high-precision machining of the rocker arm bracket assembly.

[0005] The technical solution of this invention is as follows:

[0006] This invention provides a welding device for a butterfly valve rocker arm bracket, comprising a base, a pressure plate, a pad, a pin, and a V-shaped stop. The pad is fixed to the base to support the free end of the rocker arm bracket to be welded, and thin walls are provided on both sides of the pad to clamp the free end of the rocker arm bracket. The rocker arm to be welded and the rocker arm bracket are placed vertically and pressed together by the pressure plate. The arc surfaces of the rocker arm to be welded and the rocker arm bracket simultaneously abut against the V-groove of the V-shaped stop, and are held in a pressed state by the inner pin. The lower end face of the rocker arm to be welded is installed in the bottom groove of the base, and the free end plane of the rocker arm bracket rests on the upper surface of the central protrusion of the pad.

[0007] Furthermore, the pad has a recessed boss in the middle, the parallelism error of the upper and lower surfaces of the boss does not exceed 0.002mm, the flatness error of the upper surface of the boss does not exceed 0.001mm, and the pad has thin walls on both sides for elastic clamping. The thickness of the thin walls is consistent, and the distance between the thin walls should be 0-0.003mm smaller than the width of the bracket.

[0008] Furthermore, both the upper and lower planes of the base need to maintain a certain flatness, not less than 0.003mm, in order to avoid large cumulative errors.

[0009] Furthermore, the groove at the bottom of the base is fitted with the rocker arm to be welded with a small clearance of 0.01mm.

[0010] Furthermore, the groove is open at both ends to ensure that the bottom surface of the rocker arm to be welded is coplanar with the bottom surface of the base.

[0011] Furthermore, the height of the base is half the height of the rocker arm, and the parallelism error of the upper and lower surfaces of the base does not exceed 0.003mm.

[0012] Furthermore, the lower end of the V-shaped stop is provided with a through rectangular groove as a welding window; the middle part of the V-shaped stop is provided with a through hole to cooperate with a pin to fix the rocker arm bracket and rocker arm to be welded.

[0013] In another aspect, the present invention also proposes a welding and clamping method for a butterfly valve rocker arm bracket, the method comprising the following steps:

[0014] Step 1: Place the base on the welding horizontal plane and use it as the welding reference plane;

[0015] Step 2: Place the rocker arm to be welded into the reference groove, ensuring that the lower end face of the rocker arm to be welded is coplanar with the welding reference surface;

[0016] Step 3: Place the rocker arm bracket to be welded on the upper end of the rocker arm to be welded;

[0017] Step 4: Place the V-shaped stop block on the base and adjust its position appropriately to ensure that the V-shaped surface of the V-shaped stop block is simultaneously attached to the outer arc surface of the rocker arm and rocker arm bracket to be welded; install the fastening screw through the through hole in the middle of the V-shaped stop block to lock the pin, so that the arc surface of the pin is tightly attached to the inner arc surface of the rocker arm and rocker arm bracket to be welded; by using the V-shaped stop block and the pin, it is ensured that during welding, the outer arc surface of the rocker arm and rocker arm bracket is tightly attached to the V-shaped surface of the V-shaped stop block, thereby achieving coplanarity of the two arc surfaces;

[0018] Step 5: Place the pad on the base and initially position the pad using the fastening screws, keeping the fastening screws loose at this time; place the free end of the rocker arm bracket to be welded inside the pad and use the thin walls on both sides to clamp it elastically.

[0019] Step 6: Fine-tune the position of the shim to ensure that the elastic thin walls on both sides of the shim are equidistant from the tail of the rocker arm to be welded. At this time, fix the position of the shim with the fastening screws.

[0020] Step 7: Use the pressure plate to press the rocker arm bracket to be welded to ensure that the free end surface of the bracket to be welded is in contact with the upper surface of the inner boss of the pad;

[0021] Step 8: Weld the rocker arm to be welded to the rocker arm bracket by using the rectangular groove through the middle of the V-shaped stop.

[0022] The beneficial effects of this invention are that it provides a precision rocker arm bracket assembly welding device. Utilizing the self-centering principle of V-blocks, it ensures that the rotation axes of rocker arms and rocker arm brackets of the same diameter are collinear. Combined with thin-walled elastic clamping of pads and manual fine-tuning positioning, the distances from both ends of the tail of the welded rocker arm to the two sides of the free end of the bracket are equal, achieving extremely high symmetry. At the same time, precision grinding is performed using small-sized pads to provide high-precision flatness support and parallelism reference transmission, so that the parallelism between the upper and lower surfaces of the welded rocker arm and the plane of the free end of the rocker arm bracket reaches the micrometer level. Precision forming can be achieved in one step without secondary processing after welding, greatly shortening the processing time and ensuring the precise control of the output flow by the rocker arm bracket assembly driving the butterfly valve. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the welding clamping device of the present invention;

[0024] Figure 2 This is a top view of the clamping device of the present invention;

[0025] Figure 3 This is a side view of the clamping device of the present invention;

[0026] Figure 4 This is a schematic diagram of the rocker arm support assembly structure;

[0027] Figure 5 This is a schematic diagram of the pad block structure;

[0028] Figure 6 This is a schematic diagram of the V-shaped stop structure;

[0029] Among them, 1. base; 2. pressure plate; 3. pad block; 4. rocker arm; 5. rocker arm bracket; 6. pin; 7. V-shaped stop block. Detailed Implementation

[0030] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings:

[0031] See appendix Figure 4 Taking the processing of a rocker arm bracket assembly for a certain type of butterfly valve as an example, the rocker arm bracket assembly includes a rocker arm and a rocker arm bracket.

[0032] like Figure 1 As shown, a welding device for a precision butterfly valve rocker arm bracket assembly includes a base 1, a pressure plate 2, a pad 3, a rocker arm 4, a rocker arm bracket 5, a pin 6, and a V-shaped stop 7.

[0033] The pad 3 is fixed on the base 1 to support the free end of the rocker arm bracket 5 to be welded. Thin walls are also provided on both sides of the pad 3 to clamp the free ends of the rocker arm bracket 5 to be welded. The rocker arm 4 and the rocker arm bracket 5 are placed vertically and pressed together by the pressure plate 2. The arc surfaces of the rocker arm and the rocker arm bracket are pressed against the V-groove of the V-shaped stop block 7 and kept pressed together by the inner pin 6. The lower end face of the rocker arm to be welded is installed in the groove at the bottom of the base, and the free end plane of the rocker arm bracket is placed on the upper surface of the protrusion in the middle of the pad.

[0034] In the specific implementation process, the base 1 is precision machined, and a groove is machined at the bottom of the base 1. The width of the groove is 0.01mm larger than the thickness of the rocker arm to ensure that the rocker arm can smoothly enter the groove and that the range of motion is controllable. The upper and lower surfaces of the base 1 are flat ground to ensure that the parallelism error of the upper and lower surfaces of the base 1 does not exceed 0.003mm and the flatness error of the upper surface of the base does not exceed 0.002mm, so as to ensure that the parallelism error between the upper and lower surfaces of the rocker arm and the surface of the base does not exceed 0.003mm.

[0035] The precision grinding pad 3 is ground to ensure that the parallelism error of the upper and lower surfaces of the internal boss of the pad does not exceed 0.002mm and the flatness error of the upper surface of the boss does not exceed 0.001mm. This ensures that after the pad is installed on the base, the cumulative parallelism error between the upper surface of the internal boss of the pad 3 and the upper surface of the base does not exceed 0.005mm. The elastic thin walls on both sides of the pad are ground again to make the thickness of the thin walls on both sides consistent. This ensures that when the pad is finely adjusted, the distance between the elastic thin walls on both sides of the pad and the two ends of the rocker arm tail is the same as the distance between the two sides of the free end of the rocker arm bracket and the two ends of the rocker arm tail. This ultimately ensures the high symmetry of the rocker arm bracket relative to the rocker arm axis.

[0036] During welding, place the rocker arm 4 in the groove of the base 3, and place the rocker arm bracket 5 above the rocker arm 4, so that the arc welding end of the rocker arm bracket is close to the arc welding point of the rocker arm. Place the V-shaped stop 7 on the base 1 and adjust the position of the V-shaped stop 7 appropriately to ensure that the V-shaped surface of the V-shaped stop 7 is simultaneously attached to the outer arc surface of the rocker arm and the rocker arm bracket to be welded. Install the fastening screw through the middle through hole of the V-shaped stop 6 to lock the pin 6, so that the arc surface of the pin is tightly attached to the inner arc surface of the rocker arm and the rocker arm bracket to be welded. With the V-shaped stop 7 and the pin 6 in conjunction, use the fastening screw to pass through the middle through hole of the V-shaped stop 7 to tighten the pin 6 to the inner side of the arc surface of the rocker arm and the rocker arm bracket, ensuring that the arc surface of the rocker arm and the rocker arm bracket is always in close contact with the V-shaped groove of the V-shaped stop 7 during the welding process. Ensure that the outer arc surface of the rocker arm and the rocker arm bracket is tightly attached to the V-shaped surface of the V-shaped stop 5 during welding, thereby achieving coplanarity of the two arc surfaces.

[0037] Place the shim on the base and initially position it using the fastening screws, keeping them loose at this point. Place the free end of the rocker arm bracket to be welded inside the shim and clamp it using the elasticity of the thin walls on both sides. Fine-tune the position of the shim so that the elastic thin walls on both sides of the shim are equidistant from the tail of the rocker arm to be welded. Then, fix the position of the shim using the fastening screws.

[0038] In the specific implementation process, the pressure plate is pressed tightly against the rocker arm bracket to be welded to ensure that the free end surface of the bracket to be welded is in contact with the upper surface of the inner boss of the pad. The welding process is carried out through the rectangular groove in the middle of the V-shaped stop to weld the rocker arm to be welded and the rocker arm bracket into one piece.

[0039] This invention utilizes the self-centering principle of V-blocks to ensure that the rotation axes of rocker arms and rocker arm brackets of the same diameter are collinear. Combined with the thin-walled elastic clamping of the pads and manual fine-tuning positioning, the distances from both ends of the tail of the welded rocker arm to the two sides of the free end of the bracket are equal, achieving extremely high symmetry. At the same time, precision grinding is performed using small-sized pads to provide high-precision flatness support and parallelism reference transmission, so that the parallelism between the upper and lower surfaces of the welded rocker arm and the plane of the free end of the rocker arm bracket reaches the micrometer level. Precision forming can be achieved in one step without secondary processing after welding, greatly shortening the processing time and ensuring that the rocker arm bracket assembly drives the butterfly valve to accurately control the output flow.

[0040] Finally, it should be noted that the above embodiments or examples are only used to illustrate the technical solutions of the present invention. Any omissions are considered as conventional technical means or common knowledge in the field. It should be understood that the protection scope of the present invention is not limited to the specific embodiments described above. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions should be included within the protection scope of the present invention.

Claims

1. A welding device for a butterfly valve rocker arm bracket, characterized by, The assembly includes a base, a pressure plate, a pad, a pin, and a V-shaped stop. The pad is fixed to the base to support the free end of the rocker arm bracket to be welded. Thin walls are also provided on both sides of the pad to clamp the free end of the rocker arm bracket to be welded. The rocker arm to be welded and the rocker arm bracket are placed vertically and pressed together by the pressure plate. The arc surfaces of the rocker arm to be welded and the rocker arm bracket are simultaneously pressed against the V-groove of the V-shaped stop, and are kept pressed together by the inner pin. The lower end face of the rocker arm to be welded is installed in the groove at the bottom of the base, and the free end plane of the rocker arm bracket is placed on the upper surface of the protrusion in the middle of the pad.

2. The welding device for a butterfly valve rocker arm bracket as described in claim 1, characterized in that, The pad has a recessed boss in the middle. The parallelism error of the upper and lower surfaces of the boss does not exceed 0.002mm, and the flatness error of the upper surface of the boss does not exceed 0.001mm. The pad has thin walls on both sides for elastic clamping. The thickness of the thin walls is consistent, and the distance between the thin walls should be 0-0.003mm smaller than the width of the bracket.

3. The welding device for a butterfly valve rocker arm bracket as described in claim 1, characterized in that, The upper and lower planes of the base must maintain a certain flatness, not less than 0.003mm, in order to avoid large cumulative errors.

4. The welding device for a butterfly valve rocker arm bracket as described in claim 3, characterized in that, The groove at the bottom of the base fits with the rocker arm to be welded with a small clearance of 0.01mm.

5. The welding device for a butterfly valve rocker arm bracket as described in claim 4, characterized in that, The groove is open at both ends to ensure that the bottom surface of the rocker arm to be welded is coplanar with the bottom surface of the base.

6. The welding device for a butterfly valve rocker arm bracket as described in claim 1, characterized in that, The height of the base is half the height of the rocker arm, and the parallelism error of the upper and lower surfaces of the base does not exceed 0.003mm.

7. The welding device for a butterfly valve rocker arm bracket as described in claim 1, characterized in that, The V-shaped stop has a through rectangular groove as a welding window; the middle of the V-shaped stop also has a through hole to fit a pin to fix the rocker arm bracket and rocker arm to be welded.

8. A welding clamping method for a butterfly valve rocker arm bracket, employing the welding device described in any one of claims 1 to 7, characterized in that, Includes the following steps: Step 1: Place the base on the welding horizontal plane and use it as the welding reference plane; Step 2: Place the rocker arm to be welded into the groove at the bottom of the base, ensuring that the lower end face of the rocker arm to be welded is coplanar with the welding reference surface; Step 3: Place the rocker arm bracket to be welded on the upper end of the rocker arm to be welded; Step 4: Place the V-shaped stop block on the base and adjust its position appropriately to ensure that the V-shaped surface of the V-shaped stop block is simultaneously attached to the outer arc surface of the rocker arm and rocker arm bracket to be welded; install the fastening screw through the through hole in the middle of the V-shaped stop block to lock the pin, so that the arc surface of the pin is tightly attached to the inner arc surface of the rocker arm and rocker arm bracket to be welded; by using the V-shaped stop block and the pin, it is ensured that during welding, the outer arc surface of the rocker arm and rocker arm bracket is tightly attached to the V-shaped surface of the V-shaped stop block, thereby achieving coplanarity of the two arc surfaces; Step 5: Place the pad on the base and initially position the pad using the fastening screws, keeping the fastening screws loose at this time; place the free end of the rocker arm bracket to be welded inside the pad and use the thin walls on both sides to clamp it elastically. Step 6: Fine-tune the position of the shim to ensure that the elastic thin walls on both sides of the shim are equidistant from the tail of the rocker arm to be welded. At this time, fix the position of the shim with the fastening screws. Step 7: Use the pressure plate to press the rocker arm bracket to be welded to ensure that the free end surface of the bracket to be welded is in contact with the upper surface of the inner boss of the pad; Step 8: Weld the rocker arm to be welded to the rocker arm bracket by performing the welding process through the rectangular groove of the V-shaped stop.

Images