A plasma surfacing apparatus for making copper-tungsten alloy contacts

Abstract

The present application relates to the technical field of welding equipment, in particular to a kind of plasma surfacing equipment for preparing copper tungsten alloy contact, including welding box body and the pedestal being located in welding box body, pedestal is equipped with the placement seat for placing the alloy contact body to be welded, when using, upper preheating head is inserted into alloy contact body interior and is preheated, cooperates with two opposite cooling clamping heads, while clamping workpiece, can actively cool the outer wall of workpiece, solve the energy gradient contradiction between the low melting point of copper matrix and the high temperature demand of surfacing layer, prevent the excessive expansion of heat affected zone and the softening of matrix, ensure the conductive stability and mechanical strength of copper tungsten alloy contact body after surfacing, clamping portion can simultaneously drive placement seat to lift and cooling clamping head to be loose clamped, improve action synchronism and positioning accuracy, drive portion drives upper preheating head intermittent rotation, so that plasma surfacing gun can be segmented step-by-step surfacing along contact inner wall, avoid local overheating caused by continuous surfacing.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, and in particular to a plasma cladding equipment for preparing copper-tungsten alloy contacts. Background Technology

[0002] Copper-tungsten alloy contacts are core actuators in power equipment such as high-voltage and ultra-high-voltage switchgear and vacuum circuit breakers. Their physical properties directly determine the operational reliability and opening / closing life of the power system. In existing manufacturing processes, to achieve a high-strength bond between the contact working surface and the substrate, plasma welding technology is widely used in the preparation of wear-resistant and corrosion-resistant alloy layers due to its advantages such as high energy density, good molten pool protection, and ease of automation.

[0003] For example, Chinese patent application number CN202511422847.3 discloses a corrosion-resistant high-entropy alloy weld overlay layer for marine structural steel surfaces and its preparation method. This method constructs a reinforcing layer on the metal substrate surface through plasma arc powder welding, demonstrating significant process rationality in handling large structural components and improving the corrosion resistance of sheet metal. However, precision electrical contacts and large ship components differ by orders of magnitude in geometric scale, with their dimensions typically limited to the millimeter to centimeter level. In weld overlay systems designed for macroscopic components, the heat input mode of the plasma arc is often too coarse. Its extremely high energy density can cause instantaneous heat surges within the small volume of precision contacts. Furthermore, there is a natural energy gradient contradiction between the low melting point of the copper substrate and the high melting point requirement of tungsten powder. If the heat input is too large, it will not only lead to excessive expansion of the heat-affected zone, causing thermal embrittlement and softening of the substrate material and loss of its original conductive stability, but also cause uncontrolled dilution between the weld overlay layer and the substrate, resulting in severe segregation of the copper-tungsten alloy microstructure, thereby weakening the contact's anti-fusion welding performance. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a plasma cladding equipment for preparing copper-tungsten alloy contacts, so as to solve the technical problem that excessive heat input in the prior art not only leads to excessive expansion of the heat-affected zone, causing thermal embrittlement and softening of the base material and loss of its original conductivity stability, but also causes uncontrolled dilution between the cladding layer and the base material, resulting in severe segregation of the metallographic structure of the copper-tungsten alloy, thereby weakening the anti-fusion welding performance of the contacts.

[0005] To achieve the above objectives, the present invention provides a plasma cladding apparatus for preparing copper-tungsten alloy contacts, comprising a welding box and a base disposed within the welding box, wherein the base is provided with a placement seat for placing the alloy contact body to be welded, and the plasma cladding apparatus further comprises:

[0006] Two cooling clamping heads are disposed opposite each other on the base, and the cooling clamping heads cooperate with the outer wall of the alloy contact body;

[0007] An upper preheating head is collinear with the axis of the placement seat in the vertical direction, and the upper preheating head can extend into the alloy contact body;

[0008] The plasma welding gun is adjustable and located on the side of the upper preheating head;

[0009] A clamping part used to drive the placement seat to perform lifting and lowering actions and to cool the clamping head to loosen and tighten its clamping;

[0010] A drive unit for intermittently rotating the upper preheating head.

[0011] Furthermore, the upper preheating head is provided with an extension support on its side end, and an adjustable mounting plate is provided on the extension support via bolts. The plasma welding gun is located at the lower end of the mounting plate.

[0012] Furthermore, the plasma welding torch includes:

[0013] The tungsten electrode at the center;

[0014] An ion gas layer located outside the tungsten electrode;

[0015] A cooling water layer located outside the ion gas layer;

[0016] A metal powder layer disposed on the outside of the cooling water layer;

[0017] A protective gas layer is provided on the outside of the metal powder layer.

[0018] Furthermore, the clamping part includes:

[0019] An inverted bracket disposed on the base;

[0020] A cylinder is located at the lower end of the C-shaped seat, and the placement seat is located on the output end of the cylinder.

[0021] The flipping arms are hinged to both sides of the C-shaped base, and the cooling clamping head is located at the top of the flipping arms;

[0022] An inclined groove is formed on the tilting arm;

[0023] A push-pull rod is provided at one end of the side of the placement seat, and the other end of the push-pull rod is slidably disposed in the inclined groove.

[0024] Furthermore, the base has an installation opening, the C-shaped seat is located in the installation opening, and the flipping paths of the two flipping arms are both within the range of the installation opening.

[0025] Furthermore, the drive unit includes:

[0026] A lifting and lowering fixed frame installed inside the welding box;

[0027] The drive motor is mounted on the fixed frame;

[0028] A crank located at the output end of the drive motor;

[0029] A connecting rod is hinged at one end to the crank, and a lever is hinged at the other end of the connecting rod;

[0030] Rotate the ratchet mounted on the fixed frame; the upper preheating head is located at the lower end of the ratchet.

[0031] A rotating cylinder is coaxially sleeved inside the ratchet, and the actuating plate is fixedly mounted on the rotating cylinder;

[0032] A pawl is provided on the actuating plate, and the pawl engages with the ratchet.

[0033] Furthermore, the actuating plate is provided with a sliding groove, and a slider is slidably mounted in the sliding groove by a sliding rod. The pawl is provided on the slider, and a spring is sleeved on the sliding rod. One end of the spring abuts against the slider, and the other end of the spring abuts against the inner wall of the sliding groove.

[0034] Furthermore, the base is provided with a support column, the support column is provided with a second cylinder, the output end of the second cylinder is provided with a sliding seat, the sliding seat is slidably disposed on the support column, and the fixing frame is disposed on the sliding seat.

[0035] Furthermore, the upper preheating head includes a preheating body and a heating element disposed inside the preheating body, wherein the outer diameter of the preheating body is smaller than the inner diameter of the alloy contact body.

[0036] Furthermore, the cooling clamping head has a cooling channel inside, and the inlet and outlet ends of the cooling channel are respectively connected to an external cooling medium circulation system. A thermally conductive pad is provided on the side of the cooling clamping head facing the alloy contact body, and the thermally conductive pad is in thermal contact with the cooling channel.

[0037] The beneficial effects of this invention are as follows: In use, the upper preheating head extends into the interior of the alloy contact body for preheating. In conjunction with two opposing cooling clamping heads, the outer wall of the workpiece can be actively cooled while clamping the workpiece. This solves the energy gradient contradiction between the low melting point of the copper substrate and the high temperature requirement of the weld overlay, preventing excessive expansion of the heat-affected zone and softening of the substrate. It ensures the conductivity stability and mechanical strength of the copper-tungsten alloy contact body after weld overlay. The clamping part can simultaneously drive the lifting and lowering of the placement seat and the tightening and loosening of the cooling clamping head, improving the synchronization of actions and positioning accuracy. The driving part drives the upper preheating head to rotate intermittently, enabling the plasma welding gun to perform segmented step-by-step weld overlay along the inner wall of the contact, avoiding local overheating caused by continuous weld overlay. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in this invention 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 for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of the present invention;

[0040] Figure 2 This is a schematic diagram of the assembly of the base and some structures in this invention;

[0041] Figure 3 This is a schematic diagram of the assembly of the clamping part and the alloy contact body in this invention;

[0042] Figure 4 This is a schematic diagram of the clamping part in the present invention;

[0043] Figure 5 This is a schematic diagram of the assembly of the ion welding torch and the drive unit of the present invention.

[0044] Figure 6 for Figure 5 Enlarged view of the structure at point A in the middle;

[0045] Figure 7 This is a schematic diagram of the internal structure of the ion welding torch of the present invention.

[0046] The diagram is marked as follows:

[0047] 1. Welding box body; 2. Base; 3. Alloy contact body; 4. Placement seat; 5. Cooling clamp head; 6. Upper preheating head; 7. Extending support; 8. Tungsten electrode; 9. Ion gas layer; 10. Cooling water layer; 11. Metal powder layer; 12. Protective gas layer; 13. C-shaped seat; 14. Cylinder one; 15. Tilting arm; 16. Inclined groove; 17. Push-pull rod; 18. Mounting port; 19. Fixing frame; 20. Drive motor; 21. Crank; 22. Connecting rod; 23. Actuating plate; 24. Ratchet; 25. Rotary drum; 26. Pawl; 27. Slide rod; 28. Slider; 29. ​​Spring; 30. Support column; 31. Cylinder two. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0049] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0050] In a first aspect, the present invention provides a plasma welding apparatus for preparing copper-tungsten alloy contacts, such as... Figure 1-7 As shown, the plasma welding equipment includes a welding box body 1 and a base 2 disposed inside the welding box body 1. The base 2 is provided with a placement seat 4 for placing the alloy contact body 3 to be welded. The plasma welding equipment also includes:

[0051] Two cooling clamping heads 5 are disposed opposite to each other on the base 2, and the cooling clamping heads 5 cooperate with the outer wall of the alloy contact body 3;

[0052] The upper preheating head 6 is collinear with the axis of the placement seat 4 in the vertical direction, and the upper preheating head 6 can extend into the alloy contact body 3;

[0053] Adjustable plasma welding torch located on the side of the upper preheating head 6;

[0054] The clamping part is used to drive the placement seat 4 to perform lifting and lowering actions and to cool the clamping head 5 to tighten and loosen its clamping action.

[0055] A drive unit used to drive the upper preheating head 6 to rotate intermittently.

[0056] In this embodiment, when in use, the upper preheating head 6 first extends into the alloy contact body 3 to preheat, realizing the heat transfer from the inside of the workpiece to the outside, effectively reducing the temperature gradient inside the workpiece, reducing the thermal stress caused by the large temperature difference during the welding process, and preventing the copper substrate from becoming brittle due to sudden heating.

[0057] Secondly, the two opposing cooling clamping heads 5 can actively cool the outer wall of the workpiece while clamping it. This precise control of the internal and external temperature fields strictly limits the high-energy heat input generated by the plasma welding gun to the local area to be welded, achieving the purpose of directional heat dissipation. That is, the preheating of the upper preheating head 6 makes the substrate reach the starting temperature that is conducive to the spread of the molten pool, while the cooling clamping head 5 quickly removes the excess heat and prevents the heat from spreading to the depth of the workpiece body. This solves the contradiction of energy gradient between the low melting point of the copper substrate and the high temperature requirement of the weld layer, prevents the excessive expansion of the heat-affected zone and the softening of the substrate, and ensures the conductivity stability and mechanical strength of the copper-tungsten alloy contact body 3 after welding.

[0058] The clamping part can simultaneously drive the placement seat 4 to rise and the cooling clamping head 5 to tighten and loosen, improving the synchronization of actions and positioning accuracy. The driving part drives the upper preheating head 6 to rotate intermittently, so that the plasma welding gun can perform segmented step welding along the inner wall of the contact, avoiding local overheating caused by continuous welding, which is conducive to the solidification of the molten pool segment by segment, refining the grains, improving the uniformity of the metallographic structure, and reducing segregation.

[0059] In this embodiment, as Figure 5 As shown, the upper preheating head 6 has an extension support 7 on its side. An adjustable mounting plate is mounted on the extension support 7 via bolts. The plasma welding torch is located at the lower end of the mounting plate, which enables precise position adjustment of the plasma welding torch relative to the upper preheating head 6. The operator can flexibly adjust the horizontal extension distance, vertical height, and angle relative to the workpiece axis of the welding torch according to the size of the alloy contact body 3 and the design thickness and shape of the welding layer. This multi-degree-of-freedom fine-tuning capability ensures that the welding torch head can be aligned with the position to be welded at the optimal target distance and angle, thereby ensuring the stability of the plasma arc, the uniformity of the molten pool, and the deposition efficiency of the metal powder.

[0060] In this embodiment, as Figure 7 As shown, the plasma welding torch includes:

[0061] 8. Tungsten electrode at the center;

[0062] An ion gas layer 9 is located outside the tungsten electrode 8;

[0063] Cooling water layer 10 is located outside the ion gas layer 9;

[0064] A metal powder layer 11 is disposed on the outside of the cooling water layer 10;

[0065] A protective gas layer 12 is provided on the outside of the metal powder layer 11;

[0066] Specifically, the central tungsten electrode 8 is used to generate a stable compressed plasma arc; the adjacent ion gas layer 9 provides ionized gas to ensure the energy density and stability of the plasma arc; the cooling water layer 10 can effectively remove the heat generated inside the gun body due to high temperature, preventing the tungsten electrode 8 and the gun body from overheating, ensuring the reliability of the equipment during long-term operation and the stability of the plasma arc; the metal powder layer 11 accurately and uniformly delivers alloy powder into the center of the plasma arc, achieving high-precision powder supply and improving the compositional uniformity and deposition rate of the weld overlay layer; the outermost protective gas layer 12 forms an inert gas barrier, completely isolating the molten pool from the surrounding air, effectively preventing the oxidation and nitriding of the copper-tungsten alloy at high temperatures, and ensuring the purity and metallurgical quality of the weld overlay metal.

[0067] In this embodiment, as Figure 3 , Figure 4 As shown, the clamping part includes:

[0068] An inverted bracket 13 is provided on the base 2;

[0069] The cylinder 14 is located at the lower end of the C-shaped seat 13, and the mounting seat 4 is located on the output end of the cylinder 14.

[0070] The flipping arms 15 are hinged to both sides of the C-shaped base 13, and the cooling clamping head 5 is located on the top of the flipping arms 15.

[0071] An inclined groove 16 is formed on the tilting arm 15;

[0072] A push-pull rod 17 is located at one end of the side of the placement seat 4, and the other end of the push-pull rod 17 is slidably located in the inclined groove 16.

[0073] When cylinder 14 drives the placement seat 4 to rise, the push-pull rod 17 moves upward accordingly. Since the end of the push-pull rod 17 slides in the inclined groove 16, this movement is converted into a thrust on the flipping arm 15, forcing the two flipping arms 15 to flip outward around their hinge point, thereby releasing the cooling clamping head 5. At the same time, the upper preheating head 6 of the upper port of the alloy contact body 3 is inserted into the interior of the alloy contact body 3 for preheating, realizing the heat transfer from the inside of the workpiece to the outside. Conversely, when cylinder 14 drives the placement seat 4 to descend, push-pull rod 17 pulls the flipping arm 15 inward to close, so that the cooling clamping head 5 is tightly attached to the outer wall of the alloy contact body 3. At this time, the high-energy heat input generated by the plasma welding gun is strictly limited to the local area to be welded, realizing precise synchronization between the clamping action and the workpiece positioning action. This ensures that when the upper preheating head 6 is preheating and the welding gun is working, the cooling clamping head 5 always reliably clamps the workpiece with constant pressure, realizing efficient contact heat conduction and ensuring the consistency of cooling effect.

[0074] In this embodiment, as Figure 2As shown, the base 2 has an installation port 18, and the C-shaped seat 13 is located in the installation port 18. The flipping paths of the two flipping arms 15 are both within the range of the installation port 18, so that the flipping action of the flipping arms 15 is restricted within the range of the installation port 18, avoiding interference between the moving parts and other structures inside the welding box 1, and improving the safety and reliability of the equipment operation.

[0075] In this embodiment, as Figure 5 As shown, the drive unit includes:

[0076] A lifting and lowering fixed frame 19 is installed inside the welding box 1;

[0077] The drive motor 20 is mounted on the fixed frame 19;

[0078] Crank 21 is located at the output end of drive motor 20;

[0079] One end of the connecting rod 22 is hinged to the crank 21, and the other end of the connecting rod 22 is hinged to the actuating plate 23;

[0080] Rotate the ratchet 24 mounted on the fixed frame 19, with the upper preheating head 6 located at the lower end of the ratchet 24;

[0081] A rotating drum 25 is coaxially sleeved inside the ratchet 24, and an actuating plate 23 is fixedly mounted on the rotating drum 25;

[0082] A pawl 26 is provided on the actuating plate 23, and the pawl 26 cooperates with the ratchet 24;

[0083] The continuous rotation of the drive motor 20 is converted into the reciprocating swing of the actuating plate 23. During the swing, the pawl 26 fixed on the actuating plate 23 intermittently actuates the ratchet 24 to rotate at a fixed angle, thereby driving the upper preheating head 6 to rotate intermittently in sync. First, in the preheating stage, the rotation of the upper preheating head 6 can make the heat more evenly distributed in the circumferential direction of the inner wall of the alloy contact body 3, avoiding local overheating caused by the fixed heat source and achieving a uniform preheating effect. Second, when performing multi-layer and multi-pass welding, each pass or each layer of welding can be completed, realizing indexing rotation.

[0084] In this embodiment, as Figure 5 , Figure 6As shown, the actuating plate 23 has a groove, within which a slider 28 is guided and slidably mounted via a sliding rod 27. A pawl 26 is mounted on the slider 28, and a spring 29 is sleeved on the sliding rod 27. One end of the spring 29 abuts against the slider 28, and the other end abuts against the inner wall of the groove. When the actuating plate 23 swings back, the back of the pawl 26 contacts the back of the teeth of the ratchet 24. At this time, the spring 29 is compressed, allowing the pawl 26 to smoothly slide over the tooth tops of the ratchet 24 without interference, ensuring the smooth operation of the mechanism and reducing noise and impact. When the actuating plate 23 swings forward, the elasticity of the spring 29 ensures that the pawl 26 can reliably insert into the tooth groove of the ratchet 24, achieving stable actuation.

[0085] In this embodiment, as Figure 2 , Figure 5 As shown, a support column 30 is provided on the base 2, and a cylinder 31 is provided on the support column 30. A sliding seat is provided at the output end of the cylinder 31, and the sliding seat is slidably mounted on the support column 30. The fixing frame 19 is mounted on the sliding seat. When it is necessary to load or unload the workpiece, the cylinder 31 drives the sliding seat to rise along the support column 30, which in turn moves the fixing frame 19 and the upper preheating head 6 on it upward, so that the upper preheating head 6 completely exits the interior of the alloy contact body 3, providing sufficient space for workpiece loading and unloading. After the workpiece is lifted and clamped by the placement seat 4, the cylinder 31 drives the upper preheating head 6 to descend, accurately inserting it into the workpiece. This lifting mechanism, independent of the clamping part, makes the insertion and withdrawal of the upper preheating head 6 smooth and controllable, avoiding collision with the workpiece and ensuring the automation and safety of the operation.

[0086] In this embodiment, the upper preheating head 6 includes a preheating body and a heating element disposed inside the preheating body. The outer diameter of the preheating body is smaller than the inner diameter of the alloy contact body 3. The tiny gap between the two forms a uniform air gap or thermally conductive gap. This gap avoids scratches that may be caused by direct contact between the preheating head and the inner wall of the workpiece, and ensures that heat can be uniformly transferred to the inner wall of the workpiece mainly through radiation and air convection. This non-contact or micro-contact preheating method further improves the uniformity of heat distribution, making the preheating temperature field of the inner wall of the workpiece smoother, which is beneficial for forming a uniform molten pool during subsequent welding.

[0087] In this embodiment, the cooling clamp head 5 is provided with a cooling channel inside. The inlet and outlet ends of the cooling channel are respectively connected to an external cooling medium circulation system, realizing efficient active cooling. The cooling medium circulates continuously in the channel, which can quickly remove the heat transferred from the alloy contact body 3. A thermally conductive pad is provided on the side of the cooling clamp head 5 facing the alloy contact body 3. The thermally conductive pad is in thermal contact with the cooling channel, which greatly improves the thermal conductivity of the contact interface.

[0088] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention includes the claims being limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

[0089] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A plasma cladding apparatus for preparing copper-tungsten alloy contacts, comprising a welding box body (1) and a base (2) disposed within the welding box body (1), characterized in that, The base (2) is provided with a placement seat (4) for placing the alloy contact body (3) to be welded. The plasma welding equipment also includes: Two cooling clamping heads (5) are disposed opposite to each other on the base (2), and the cooling clamping heads (5) cooperate with the outer wall of the alloy contact body (3); The upper preheating head (6) is collinear with the axis of the placement seat (4) in the vertical direction, and the upper preheating head (6) can extend into the alloy contact body (3); An adjustable plasma welding gun located on the side of the upper preheating head (6); The clamping part is used to drive the placement seat (4) to perform lifting and lowering actions and to cool the clamping head (5) to tighten and loosen its clamping action; A drive unit for intermittently rotating the upper preheating head (6).

2. The plasma cladding equipment for preparing copper-tungsten alloy contacts according to claim 1, characterized in that, The upper preheating head (6) has an extension support (7) on its side end. The extension support (7) is equipped with an adjustable mounting plate by bolts. The plasma welding gun is located at the lower end of the mounting plate.

3. The plasma cladding equipment for preparing copper-tungsten alloy contacts according to claim 2, characterized in that, The plasma welding torch includes: Tungsten electrode at the center (8); An ion gas layer (9) is provided on the outside of the tungsten electrode (8); A cooling water layer (10) is provided outside the ion gas layer (9); A metal powder layer (11) is disposed on the outside of the cooling water layer (10); A protective gas layer (12) is provided on the outside of the metal powder layer (11).

4. The plasma cladding equipment for preparing copper-tungsten alloy contacts according to claim 1, characterized in that, The clamping part includes: An inverted bracket (13) is provided on the base (2); A cylinder (14) is located at the lower end of the shaped seat (13), and the placement seat (4) is located on the output end of the cylinder (14); The flipping arms (15) are hinged to both sides of the C-shaped base (13), and the cooling clamping head (5) is located on the top of the flipping arms (15); An inclined groove (16) is formed on the tilting arm (15). A push-pull rod (17) is located at one end of the side of the placement seat (4), and the other end of the push-pull rod (17) is slidably located in the inclined groove (16).

5. The plasma cladding equipment for preparing copper-tungsten alloy contacts according to claim 4, characterized in that, The base (2) has an installation port (18), the shaped seat (13) is located in the installation port (18), and the flipping paths of the two flipping arms (15) are both within the range of the installation port (18).

6. The plasma cladding equipment for preparing copper-tungsten alloy contacts according to claim 1, characterized in that, The drive unit includes: A fixed frame (19) that can be raised and lowered inside the welding box body (1); A drive motor (20) is mounted on the fixed frame (19). A crank (21) is provided at the output end of the drive motor (20); A connecting rod (22) is hinged at one end to the crank (21), and a lever plate (23) is hinged at the other end of the connecting rod (22). Rotate the ratchet (24) mounted on the fixed frame (19), with the upper preheating head (6) located at the lower end of the ratchet (24); A rotating cylinder (25) is coaxially sleeved inside the ratchet (24), and the actuating plate (23) is fixedly mounted on the rotating cylinder (25); A pawl (26) is provided on the actuating plate (23), and the pawl (26) cooperates with the ratchet (24).

7. The plasma cladding equipment for preparing copper-tungsten alloy contacts according to claim 6, characterized in that, The actuating plate (23) has a groove, and a slider (28) is slidably mounted in the groove by a sliding rod (27). A pawl (26) is mounted on the slider (28), and a spring (29) is sleeved on the sliding rod (27). One end of the spring (29) abuts against the slider (28), and the other end of the spring (29) abuts against the inner wall of the groove.

8. The plasma cladding equipment for preparing copper-tungsten alloy contacts according to claim 6, characterized in that, The base (2) is provided with a support column (30), the support column (30) is provided with a cylinder two (31), the output end of the cylinder two (31) is provided with a sliding seat, the sliding seat is slidably disposed on the support column (30), and the fixing frame (19) is disposed on the sliding seat.

9. The plasma cladding equipment for preparing copper-tungsten alloy contacts according to claim 1, characterized in that, The upper preheating head (6) includes a preheating body and a heating element disposed inside the preheating body. The outer diameter of the preheating body is smaller than the inner diameter of the alloy contact body (3).

10. The plasma cladding equipment for preparing copper-tungsten alloy contacts according to claim 1, characterized in that, The cooling clamp head (5) has a cooling channel inside. The inlet and outlet of the cooling channel are respectively connected to an external cooling medium circulation system. The cooling clamp head (5) has a heat-conducting pad on the side facing the alloy contact body (3). The heat-conducting pad is in thermal contact with the cooling channel.

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