Electric arc spraying device

Abstract

The invention relates to the technical field of electric arc spraying, in particular to an electric arc spraying device which comprises a wire feeder, a spray gun, wire feeding wheels, a power unit and a pipeline, the pipeline is fixedly installed on the wire feeder, the spray gun is fixedly installed at the other end of the pipeline and comprises a gun head, a gun body and a handle, and the two wire feeding wheels are rotationally installed on each of the two sides of the gun body. The clamping blocks are driven by the synchronous belt to do circulating reciprocating motion, the two clamping blocks extrude and wrap a wire, the contact area with the wire is increased, the friction force with the wire is improved, it is guaranteed that the wire can still be pulled out of a pipeline even if the wire is in sufficient friction with the inner wall of the pipeline and the wire feeding resistance of the wire feeding wheel is increased when the pipeline is bent, and the wire feeding efficiency is improved. It is guaranteed that when the wire feeding wheel rotates by one circle, the length of the wires conveyed into the gun head is equal to the perimeter of the wire feeding wheel, the feeding synchronism of the wires on the two sides of the spray gun is guaranteed, the situation that a sprayed layer is not uniform is avoided, and the flexibility brought by an original flexible pipeline to the spray gun is reserved.

Description

Technical Field

[0001] This invention relates to the field of arc spraying technology, specifically to an arc spraying device. Background Technology

[0002] Arc spraying is a spraying technology used to enhance the surface of workpieces. Its working principle is to use two metal wires at a certain angle as self-fluxing electrodes. The arc is ignited at the moment the ends of the wires short-circuit, melting the wires. At the same time, a high-speed compressed airflow atomizes the molten metal droplets into fine particles, which are then sprayed at a high speed onto the pre-treated substrate surface to form a coating.

[0003] Arc spraying equipment mainly consists of a dedicated spraying power supply, control device, arc spray gun, wire feeder, and air compression supply system. The arc spray gun is one of the core components of the equipment, typically composed of a motor, wire feed rollers, and wire feed tube. Two wire feed rollers press the wire together, drawing the wire from the wire feeder to the nozzle of the spray gun, where it is short-circuited and melted.

[0004] In manual arc spraying, the wire feeding resistance is not constant; it varies constantly with the opening and closing of the wire feeding hose and the oscillation of the spray gun, exhibiting no clear pattern. This significantly impacts the stability of the wire feeding speed, and the material and shape of the wire feeding hose directly affect the magnitude of the resistance. Since the frictional force provided by the wire feeding wheel is fixed, changes in this resistance affect the synchronicity of wire feeding on both sides, resulting in uneven coating. The paper "Resistance Analysis of Arc Spraying Wire Feeding System" published in *Surface Technology* conducts an in-depth study of the frictional force between the wire feeding tube and the wire. The conclusion is that the wire feeding resistance during spraying varies between 244.24 and 406.6 N. Among these factors, changes in the shape of the wire feeding hose have the greatest impact on the fluctuation of the resistance, ranging from 0.05 to 107.31 N.

[0005] Furthermore, to ensure that the wire does not bend during transmission, the pressure between the wire feeding wheel and the wire cannot be too high. Otherwise, the wire will bend due to internal stress after passing through the wire feeding wheel. In addition, to ensure the melting effect and the uniformity of the spraying, there are specified requirements for the surface quality of the wire. Therefore, the surface of the wire feeding wheel cannot be increased with friction with the wire by means of sanding or other methods. Otherwise, the rough surface of the wire feeding wheel may damage the surface quality of the wire, resulting in uneven spraying.

[0006] To address the issue of uneven wire feeding on both sides of the spray gun due to random hose deformation, Jie Fang, in her paper "Design of a High-Stability Rigid Wire Feeder for Arc Spraying," proposed using copper as the connecting material between the spray gun and the wire feeder. By employing a rigid pipe, the problem of friction between the pipe and the wire caused by random pipe bending was avoided. However, the rigid pipe hinders the movement of the spray gun, especially for handheld spray guns. This reduces the flexibility of both spray guns mounted on robotic arms and those held by workers, thus impacting spraying efficiency.

[0007] To address this, an arc spraying device is proposed that, while ensuring the synchronous feeding of wire by the wire feeding wheels on both sides of the spray gun, retains the flexibility of the original spray gun, thus guaranteeing the quality and efficiency of spraying. Summary of the Invention

[0008] The purpose of this invention is to provide an arc spraying device that increases the contact area with the filament by squeezing and wrapping it with two clamping blocks, thereby increasing the friction between the filament and the filament. This ensures that even when the filament rubs against the inner wall of the pipe when it bends, the filament can still be pulled out of the pipe. It also ensures that the length of filament transmitted into the spray gun head is equal to the circumference of the feeding wheel when it rotates once, thus ensuring the synchronicity of filament feeding on both sides of the spray gun, avoiding uneven coating, and retaining the flexibility of the original flexible pipe for the spray gun, thereby solving the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] An arc spraying device includes: a wire feeder, a spray gun, wire feed wheels, a power unit, and a pipe. The pipe is fixedly installed on the wire feeder, and the spray gun is fixedly installed at the other end of the pipe. The spray gun includes a gun head, a gun body, and a handle. Two wire feed wheels are rotatably installed on both sides of the gun body, and a power unit for driving the wire feed wheels is provided inside the gun body.

[0011] Preferably, two pulleys are rotatably mounted on each of the two side walls of the gun body. A synchronous belt is fitted on adjacent pulleys and wire feeding wheels. Each synchronous belt is provided with multiple clamping blocks for wrapping the wire. Each clamping block is provided with a clamping assembly. When two corresponding clamping blocks pass between two pulleys or two wire feeding wheels, the two pulleys or two wire feeding wheels press the two clamping blocks tightly together, and the wire is tightly wrapped between the two clamping blocks. The clamping assembly prevents the two clamping blocks from separating after leaving between the two pulleys by applying pressure to the clamping blocks. By wrapping the wire with the two clamping blocks, the contact area and friction with the wire are increased, and the tension of the wire feeding wheel on the wire is increased.

[0012] The wire feeder is equipped with a wire feeding roller. The wire on the wire feeding roller is connected to the spray gun through a pipe. The wire feeder is equipped with a motor to drive the wire feeding roller to take up and down, so as to cooperate with the wire feeding wheel to pick up the material. Two wire feeding wheels are installed on the two side walls of the gun body. The wire feeding wheels are arranged vertically. The wire is tangential to the two wire feeding wheels and passes through the wire feeding wheels to enter the gun head. The two wire feeding wheels are driven by a power unit. When rotating, they continuously feed the wire to the gun head by friction. The gun head is equipped with a high-voltage power supply and a high-voltage air nozzle. The wire on both sides of the gun body is melted by electric arc after contact with the gun head. The molten wire is atomized by high-pressure gas and sprayed onto the surface of the workpiece. The atomized particles are continuously deposited to form a dense coating.

[0013] In existing technologies, wire is pressed and transported by a wire feeding wheel. However, to prevent the wire from bending during transport, the pressure between the wire feeding wheel and the wire cannot be too high; otherwise, the wire will bend due to internal stress after passing through the wire feeding wheel. Furthermore, to ensure a good melting effect, there are specified requirements for the surface quality of the wire, making it impossible to increase the friction between the wire feeding wheel and the wire by methods such as sanding.

[0014] In this invention, a portion of the filament is wrapped by a clamping unit to increase the contact area with the filament. This makes the friction between the clamping unit and the filament greater than the maximum change in filament feeding resistance of 406.6N during the spraying process. Therefore, as long as the power unit outputs more than 406.6N to the filament feeding wheel, the filament can be moved by a synchronous belt, ensuring the surface quality of the filament and preventing bending. The filament is then fed into the spray gun head by pulling it out of the pipe.

[0015] Preferably, the clamping unit includes a plurality of rectangular slots formed on the side wall of the clamping block, and a magnet is fixedly installed in each rectangular slot. The rectangular slot is located 2 mm below the surface of the clamping block. The clamping block is made of elastic material, and the pulley and wire feeding wheel are both made of non-magnetic material. The magnets in the clamping blocks on different synchronous belts attract each other.

[0016] The wire is a rolled zinc alloy, 3mm in diameter, with a density of 7.1g / cm³. 3 With an elastic modulus of 84 GPa and a tensile strength of 150 MPa, a wire feed roller diameter of 35 cm, and a timing belt width of 30 mm, the clamping block width is also 30 mm, which is sufficient to completely wrap the wire and facilitates the placement of magnets on the side walls of the clamping block. The clamping block length is 15 mm, so each clamping block has three 4 mm long magnets installed on both sides, ensuring that the two clamping blocks completely adhere and wrap the wire when they meet. The pulley and wire feed roller are made of polyoxymethylene plastic to prevent interference with the magnets inside the clamping block.

[0017] The clamping blocks are made of square rubber material. The coefficient of friction between the zinc alloy and the clamping blocks is 0.8. The clamping blocks on the two synchronous belts are mutually compatible and glued to the synchronous belts. Square grooves are opened on the side of the clamping blocks, and magnets are embedded in the square grooves. The magnets are neodymium iron boron magnets. When the two clamping blocks are engaged, the magnetic force between the magnets is 600N. The magnets are located inside the clamping blocks, so that the two clamping blocks can always maintain an overfit when in contact, causing the clamping blocks to deform slightly, allowing the clamping blocks to make fuller contact with the wire and ensuring stable pressure applied to the wire by the clamping blocks.

[0018] When the clamps on the timing belt move to the position closest to the wire on the pulley, the clamps on different timing belts come into contact, and the magnets on the clamps wrap around and hold part of the wire tightly. As the timing belt moves, the wire is pulled out of the pipe. When the clamps move to the position closest to the wire on the wire feeding pulley, the clamps become arc-shaped as the timing belt moves, thus gradually disengaging from the wire. At this point, the clamps continue to engage at the position closest to the wire on the pulley, repeating the above process.

[0019] Multiple clamps are installed on each synchronous belt to ensure that before the clamps completely detach from the wire on the arc surface of the wire feed wheel or pulley, a clamp is promptly wrapped around the wire on the other side, ensuring continuous wire feeding. Magnets are installed on both sides and the middle of each clamp. When clamps on different synchronous belts meet, the mutual attraction of the magnets causes the two clamps to wrap around the wire, increasing the friction with the wire. This ensures that even when the pipe bends, and the wire rubs against the inner wall of the pipe, increasing the wire feeding resistance of the wire feed wheel, the wire can still be pulled out of the pipe. This ensures that when the wire feed wheel rotates once, the length of wire transmitted into the gun head is equal to the circumference of the wire feed wheel, ensuring the synchronicity of wire feeding on both sides of the spray gun, avoiding uneven coating, and retaining the flexibility brought by the original flexible pipe to the spray gun.

[0020] Compared to existing methods that use two feeding rollers to compress and transport filaments, where the rollers and filaments only make point contact, the friction between them is insufficient to match the feeding speed when the pipe bends. This invention uses two square clamps to enclose the filament for transport. While the attraction between the magnets is equal to the pressure between the rollers and the filament in the original method, this increases the contact area. Even when the pipe bends and the friction between the filament and the pipe increases, this ensures that the length of filament transported in one rotation of the feeding roller is equal to the circumference of the roller.

[0021] Preferably, the clamps on different synchronous belts have multiple contact surfaces when they come into contact, and the two clamps that come into contact with each other are interference-fitted.

[0022] Preferably, the clamp on the filament is T-shaped, and the clamp below the filament is U-shaped.

[0023] The clamps on the synchronous belt wire are T-shaped, while the clamps below the wire are U-shaped. The protruding part of the T-shaped clamp is 13mm thick. When the clamps are engaged, the protruding part of the T-shaped clamp is embedded into the recessed part of the U-shaped clamp, and the deformation of the U-shaped clamp is less than that of the T-shaped clamp. The thickness of the side walls of the U-shaped clamp is 10mm. When the two clamps are interlocked, the deformation pressure of the U-shaped clamp on the T-shaped clamp is 50N. This causes the contact surface of the embedded part to be subjected to the pressure from both sides of the U-shaped clamp. When the two clamps wrap around the wire, the wire is subjected not only to the vertical pressure from the magnet but also to the horizontal deformation pressure from the U-shaped clamp, further increasing the tightness of the contact between the clamps and the wire, improving the friction between the clamps and the wire, and ensuring the synchronicity of the wire output.

[0024] Furthermore, in the contact surfaces of the two clamping blocks that are in contact with each other, at least two symmetrical contact surfaces do not contact each other when the two clamping blocks are not deformed, and the magnetic force of the magnet is greater than the deformation force of the clamping blocks.

[0025] The two sides of the T-shaped clamp and the two sides of the U-shaped clamp do not contact each other when the two clamps are not deformed. By utilizing the deformable property of the clamps, the magnetism of the magnet can be appropriately increased so that the contact surface of the two clamps is always under pressure when they are engaged. For example, when the protruding part of the T-shaped clamp is embedded in the concave part of the U-shaped clamp, the two clamps deform under the action of the magnet, causing the two clamps to bend inward, which further makes the clamps fit the wire. In addition, the U-shaped clamp wraps the T-shaped clamp more tightly, further expelling air from the contact surface and helping to create a negative pressure environment for the contact surface of the two clamps.

[0026] Preferably, two clamping strips are symmetrically fixedly installed on the gun body, the timing belt and the wire both pass through the clamping strips, the timing belt is in contact with the clamping strips, and the distance between the two clamping strips is less than the height of the two clamping blocks when they are engaged.

[0027] Preferably, the interval between two adjacent clamping blocks on the same synchronous belt is less than the length of the clamping strip.

[0028] The clamping bar is located in the middle of the gun body, and the two clamping bars are arranged one above the other. When the two clamping blocks on different synchronous belts meet, due to the effect of the magnet and the limitation of the shape of the two clamping blocks themselves, the fit shape of the two clamping blocks remains relatively stable when wrapping the wire. After the two clamping blocks complete the fit, they will enter between the two clamping bars. The distance between the clamping bars is less than the height of the two clamping blocks when they fit. After the clamping blocks enter between the two clamping bars, the clamping blocks are fully compressed. At this time, the wire is subjected to the most uniform force, and this stage is also the main way of transmitting the wire.

[0029] It is worth noting that regarding the friction between the timing belt and the clamping bar, a small amount of lubricating oil can be applied to the timing belt. The timing belt is made of polyurethane material, which has good oil resistance. Furthermore, the torque applied to the wire feeding wheel by the power unit is sufficient to pull the wire out of the pipe, provided that the friction between the clamping block and the wire is sufficient. Therefore, there is no need to worry about the wire feeding wheel or pulley slipping on the timing belt under high load.

[0030] The spacing between clamps on the same synchronous belt is less than the length of the clamping bar. This ensures that as soon as one clamp leaves the clamping bar, another immediately enters, guaranteeing that the tension on the wire is always equal. While it's true that making the clamps long and covering the entire synchronous belt could also maintain equal tension on the wire, sufficient friction is generated when the clamp length is less than the clamping bar length. Therefore, making the clamps long and covering the entire synchronous belt would not fully utilize their performance, resulting in low material utilization.

[0031] Preferably, a plurality of rollers that cooperate with the timing belt are rotatably mounted on the side wall of the gun body. The diameter of the rollers is larger than the tooth width of the timing belt, and the inner wall of the clamping strip is tangent to the rollers.

[0032] The timing belt is guided into the pressure bar by rollers, avoiding direct contact between the rack on the timing belt and the pressure bar, making the wire transmission more stable and reducing wear caused by friction between the timing belt and the pressure bar.

[0033] Since the height of the clamping block is greater than the spacing of the clamping strips after mating, the roller can pre-press the clamping block by rotating before it enters the clamping strips, so that the clamping block can enter the clamping strips more smoothly.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0035] 1. Multiple clamping blocks are installed on each synchronous belt to ensure that before the clamping block completely disengages from the wire on the arc surface of the wire feeding wheel or pulley, another clamping block can promptly wrap around the wire on the other side, ensuring continuous wire feeding. Magnets are installed on both sides and the middle of each clamping block. When clamping blocks on different synchronous belts meet, the mutual attraction of the magnets causes the two clamping blocks to wrap around the wire, increasing the friction with the wire. This ensures that even when the pipe bends, and the wire rubs against the inner wall of the pipe, increasing the wire feeding resistance of the wire feeding wheel, the wire can still be pulled out of the pipe. This ensures that when the wire feeding wheel rotates once, the length of wire transmitted into the gun head is equal to the circumference of the wire feeding wheel, ensuring the synchronicity of wire feeding on both sides of the spray gun, avoiding uneven coating, and retaining the flexibility brought by the original flexible pipe to the spray gun.

[0036] 2. The clamps on the wire are T-shaped, and the clamps below the wire are U-shaped. The volume of the protruding part of the T-shaped clamp is larger than the volume of the recessed part of the U-shaped clamp. When the clamps are engaged, the protruding part of the T-shaped clamp is embedded into the recessed part of the U-shaped clamp, and the deformation of the U-shaped clamp is less than that of the T-shaped clamp. This causes the contact surface of the embedded part to be subjected to pressure from both sides of the U-shaped clamp. When the two clamps wrap the wire, the wire is subjected not only to the vertical pressure exerted by the magnet, but also to the deformation pressure of the U-shaped clamp in the horizontal direction. This further increases the tightness of the contact between the clamps and the wire, ensuring the stability of the pressure applied to the wire by the clamps and ensuring the synchronicity of the wire output.

[0037] 3. When two clamping blocks on different synchronous belts meet, due to the effect of the magnets and the limitations of their own shapes, the fit of the two clamping blocks remains relatively stable when wrapping the wire. After the two clamping blocks have finished fitting, they will enter between two pressing bars. The distance between the pressing bars is less than the height of the two clamping blocks when they fit. After the clamping blocks enter between the two pressing bars, they are fully compressed. At this time, the wire is subjected to the most uniform force, and this stage is also the main way to transmit the wire. Attached Figure Description

[0038] Figure 1 This is an overall structural diagram of the present invention;

[0039] Figure 2 for Figure 1 Schematic diagram of the middle section;

[0040] Figure 3 for Figure 2 Front view of the middle section of the structure;

[0041] Figure 4 for Figure 3 Sectional view of AA;

[0042] Figure 5 for Figure 4 Enlarged view of the structure at point A in the middle;

[0043] Figure 6 This is a diagram of the clamping block structure in Example 2.

[0044] In the diagram: 1. Gun body; 2. Gun head; 3. Handle; 4. Pipe; 101. Pulley; 102. Synchronous belt; 103. Clamping block; 104. Wire feed wheel; 105. Pressure bar; 106. Roller; 107. Magnet. Detailed Implementation

[0045] The aspects and features of this disclosure, as well as methods for implementing these aspects and features, will be readily apparent; however, this disclosure is not limited to the embodiments disclosed below and can be implemented in various forms. These embodiments are provided to assist those skilled in the art in fully understanding this disclosure, and this disclosure is limited only to the scope of the appended claims.

[0046] In Example 1, the clamping strips 105 are arranged vertically, and the clamping blocks 103 wrap the wire material in a vertically cooperating manner. The clamping blocks 103 are horizontally installed on the timing belt 102. Please refer to [link / reference]. Figures 1 to 5 The present invention provides an arc spraying device, the technical solution of which is as follows:

[0047] Four circular grooves are made on the side wall of the gun body 1. Bearings are installed in the grooves, and a rotating shaft is installed in the bearings. A pulley 101 is keyed onto the rotating shaft. The diameter of the pulley 101 is equal to that of the wire feeding wheel 104. The pulleys 101 are equally installed on both sides of the spray gun. The pulleys 101 on the side wall of the gun body 1 are installed on the upper and lower sides of the wire. The horizontal distance between the pulley 101 and the wire feeding wheel 104 is 1.5 times the diameter. A timing belt 102 is installed on the pulley 101. The width of the timing belt 102 is 30cm. The original wire feeding wheel 104 on the spray gun is used as the drive wheel for the timing belt 102. The diameter of the wire feeding wheel 104 is 35cm. Two pulleys 101 and two timing belts 102 are installed on both sides of the spray gun. Four clamps 103 are glued to the timing belts 102. The clamping block 103 above the wire is T-shaped, made of natural rubber, and 30mm wide. The clamping block 103 below the wire is U-shaped, made of ethylene propylene rubber, and 30mm wide. The length of each clamping block 103 is 15mm. The wire passes through the synchronous belt 102. The clamping block 103 above the wire is T-shaped, and the clamping block 103 below the wire is U-shaped. Three magnets 107 with a length of 4mm are embedded in the interior of both sides of the clamping block 103. The clamping strip 105 is installed on both sides of the gun body 1 by screws. Two clamping strips 105 are installed on the side wall of the gun body 1. The spacing between the clamping strips 105 is less than the height when the T-shaped clamping block 103 and the U-shaped clamping block 103 are engaged. The spacing between the four clamping blocks 103 on the synchronous belt 102 is less than the length of the clamping strip 105.

[0048] The wire is made of rolled zinc alloy, with a diameter of 3mm and a density of 7.1g / cm³. 3 The elastic modulus is 84 GPa, the tensile strength is 150 MPa, the coefficient of friction between natural rubber, ethylene propylene rubber and zinc alloy is 0.8, the wire feeding speed is 7 m / min, the rated power of the power unit driving the wire feeding wheel 104 is 200 W, the mechanical efficiency of the transmission system is 80%, the efficiency of the multi-wheel drive is 95%, and the friction loss in the wire feeding hose is 10%.

[0049] Before starting the spraying process, the wire from the wire feeder is drawn into the spray gun through pipe 4. The spray gun is then aimed at the discarded workpiece, and all the wire at the front end is consumed. This continues until molten metal is observed to be evenly sprayed out of the nozzle 2.

[0050] When the spray gun is in operation, aim the nozzle 2 at the workpiece to be sprayed, press the spray gun button. The button is electrically connected to the power unit, which drives the wire feeding wheel 104 to rotate, thereby driving the synchronous belt 102. When the clamping block 103 on the synchronous belt 102 moves to the position closest to the wire on the pulley 101, the clamping blocks 103 on both sides of the wire are attracted by the magnet 107 and interlock. The protruding part of the T-shaped clamping block 103 is embedded into the recessed part of the U-shaped clamping block 103, expelling the air in the contact surface and wrapping the wire. As the synchronous belt 102 moves, it pulls the wire towards the wire feeding wheel 104. After the two clamping blocks 103 are fully engaged, the clamping blocks 103 move to the position closest to the wire. At roller 106, the synchronous belt 102 is guided into two clamping bars 105 located in the middle of the gun body 1. The distance between the two clamping bars 105 is less than the height of the two clamping blocks 103 when they are engaged. At this time, the clamping blocks 103 are fully compressed, and the tension on the wire is the greatest and most uniform. The movement of the clamping blocks 103 within the clamping bars 105 is the main way of wire transmission. After the clamping blocks 103 move to the position closest to the wire on the wire feeding wheel 104, the clamping blocks 103 gradually deform and move away from the wire, moving towards the pulley 101. Meanwhile, the other clamping blocks 103 on the synchronous belt 102 have already engaged with each other at the pulley 101 and then pull the wire out of the pipe 4.

[0051] Example 2, please refer to Figure 6 The pressing strips 105 are arranged on the left and right, and the clamping blocks 103 wrap the wire material in a left-right cooperation manner.

[0052] In this embodiment, the clamping blocks 103 on different timing belts 102 are L-shaped and are vertically mounted on the timing belts 102. Magnets 107 are correspondingly arranged on the side walls of the clamping blocks 103. A housing is provided on the gun body 1 to protect the wire feeding wheel 104 and the pulley 101. Two clamping bars 105 are vertically mounted on the gun body 1 and the housing, respectively, and the distance between the two clamping bars 105 remains unchanged.

[0053] When the spray gun is working, after the clamping block 103 moves to the position where the pulley 101 is closest to the filament, the two clamping blocks 103 cooperate with each other to wrap the filament. At this time, the magnet 107 between the two clamping blocks 103 attracts each other from both sides of the filament. The two clamping blocks 103 wrap the filament from both sides. With the movement of the synchronous belt 102, the filament is pulled towards the gun head 2. The rest of the process is the same as in Embodiment 1, and will not be described in detail here.

[0054] Compared with Embodiment 1, the two vertically arranged clamping bars 105 can prevent the timing belt 102 from being overly taut. Moreover, even though the roller 106 in Embodiment 1 is provided to reduce the friction between the clamping bar 105 and the timing belt 102, the timing belt 102 is still rubbing against the clamping bar 105, which reduces the lifespan of the timing belt 102.

[0055] Compared with Embodiment 1, when the clamping block 103 moves in the pressing bar 105, the side with the smaller area is mounted on the synchronous belt 102, while the side with the larger area of ​​the clamping block 103 contacts the pressing bar 105. Since the clamping block 103 is L-shaped, the interface between its long side and short side is prone to tearing, which reduces the service life of the clamping block 103. Furthermore, when the two clamping blocks 103 move while carrying the filament, the force on them is concentrated at the interface between the long side and short side, further reducing the service life of the clamping block 103. Therefore, in this embodiment, the clamping block 103 is made of a material with extremely high toughness and a certain deformation capacity, such as high molecular weight polyethylene fiber.

[0056] Compared with Embodiment 1, since the clamping block 103 replaces the timing belt 102 in contact with the pressing bar 105, there is no need to apply lubricating oil to the timing belt 102. Instead, the lubricating oil is applied between the clamping block 103 and the pressing bar 105. Therefore, the material of the clamping block 103 needs to be replaced with TPU or other materials with good toughness and oil resistance.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate and facilitate those skilled in the art to understand the technical solutions of the present invention, and are not intended to limit them; modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the inventive motivation of the present invention.

Claims

1. An arc spraying apparatus, comprising: A wire feeder, a spray gun, a wire feeding wheel (104), a power unit, and a pipe (4). The wire feeder is fixedly installed with a pipe (4), and a spray gun is fixedly installed at the other end of the pipe (4). The spray gun includes a gun head (2), a gun body (1), and a handle (3). Two wire feeding wheels (104) are rotatably installed on both sides of the gun body (1). A power unit for driving the wire feeding wheels (104) is provided inside the gun body (1). Its characteristic is that it further includes: Two pulleys (101) are rotatably mounted on each of the two side walls of the gun body (1). A synchronous belt (102) is fitted on adjacent pulleys (101) and wire feeding wheels (104). Each synchronous belt (102) is provided with multiple clamping blocks (103) for wrapping the wire. The clamping blocks (103) are provided with clamping components. When two corresponding clamping blocks (103) pass together between the two pulleys (101) or the two wire feeding wheels (104), Two pulleys (101) or two wire feeding wheels (104) press the two clamping blocks (103) together tightly, and the wire is tightly wrapped between the two clamping blocks (103). The clamping assembly prevents the two clamping blocks (103) from separating after leaving the two pulleys (101) by applying pressure to the clamping blocks (103). By wrapping the wire with the two clamping blocks (103), the contact area and friction with the wire are increased, and the tension of the wire feeding wheel (104) on the wire is increased.

2. The arc spraying device according to claim 1, characterized in that: The clamping unit includes multiple rectangular slots formed on the side wall of the clamping block (103), and a magnet (107) is fixedly installed in each rectangular slot. The rectangular slot is located 2 mm below the surface of the clamping block (103). The clamping block (103) is made of elastic material. The pulley (101) and the wire feeding wheel (104) are both made of non-magnetic material. The magnets (107) in the clamping blocks (103) on different synchronous belts (102) attract each other.

3. The arc spraying device according to claim 2, characterized in that: Two clamping strips (105) are fixedly installed on the gun body (1). The timing belt (102) and the wire both pass between the two clamping strips (105). The distance between the two clamping strips (105) is less than the height of the two clamping blocks (103) when they are engaged.

4. The arc spraying device according to claim 2, characterized in that: The clamps (103) on different synchronous belts (102) have multiple contact surfaces when they come into contact, and the two clamps (103) that come into contact with each other are interference fit.

5. The arc spraying device according to claim 4, characterized in that: In the contact surface of the two contacting clamps (103), at least two symmetrical contact surfaces do not contact each other when the two clamps (103) are not deformed, and the magnetic force of the magnet (107) is greater than the deformation force of the clamps (103).

6. The arc spraying device according to claim 3, characterized in that: The interval between two adjacent clamps (103) on the same synchronous belt (102) is less than the length of the clamping bar (105).

7. The arc spraying device according to claim 3, characterized in that: Multiple rollers (106) that cooperate with the timing belt (102) are rotatably mounted on both sides of the clamping bar (105).

8. The arc spraying device according to claim 4, characterized in that: The two clamping strips (105) are arranged vertically, the clamping block (103) on the filament is T-shaped, and the clamping block (103) below the filament is U-shaped.

9. An arc spraying device according to claim 4, characterized in that: The two clamping strips (105) are arranged on the left and right, the clamping block (103) on the filament is L-shaped, and the clamping block (103) below the filament is inverted L-shaped.

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