A torch apparatus for plasma spraying

Abstract

The application provides a spray gun device for plasma spraying, and belongs to the technical field of plasma spraying devices.The device comprises a base, a support is arranged at the upper end of the base, a motor is arranged at the center of one surface of the support, a lead screw is fixed to the driving end of the motor, a variable table is arranged on the outer surface of the lead screw, a plasma spraying gun fastening assembly is arranged at the lower end of the variable table, the plasma spraying gun fastening assembly fastens the plasma spraying gun, the plasma spraying gun fastening assembly comprises a fastening box and a fastening table A in the fastening box, the same number of air cylinders as the fastening table A are horizontally arranged on the outer surface of the fastening box, one end of a plunger rod on the air cylinder penetrates into the fastening box and is fixed to an embedded table; through the cooperation of the skew wall A and the skew wall B, one pair of the fastening table A can be moved downward to make the spacing between the fastening table A smaller (self-adjusting to compensate for the small change in the length of the plunger rod), and the fastening plate arranged in a ring shape can fasten the plasma spraying gun more firmly.

Description

Technical Field

[0001] This invention belongs to the technical field of plasma spraying equipment, specifically relating to a spray gun device for plasma spraying. Background Technology

[0002] Plasma spraying is a material surface treatment technology that uses a plasma arc as a heat source. It involves heating ceramic, alloy, or metal powder to a molten or semi-molten state and then spraying it at high speed onto the substrate surface to form a coating with properties such as wear resistance, corrosion resistance, and high-temperature resistance. The plasma spraying process uses a plasma spray gun to perform the spraying operation.

[0003] The prior art document (application number: 202422144763.5, a spray gun for plasma spraying) discloses: a spray gun device for plasma spraying, including a substrate and a plasma spray gun body, wherein side plates are fixedly connected to the left and right sides of the upper end face of the substrate, a movable frame is provided between the two side plates, and connecting rods are fixedly connected to the left and right sides of the movable frame, and movable grooves are provided through the outer walls of the two side plates; it realizes automatic and precise gun distance adjustment, is easy to operate, has a high degree of automation, and improves work efficiency.

[0004] During the spraying process, plasma spray guns can vibrate and shift due to various factors (high-frequency vibration generated during internal arc discharge, unstable air supply system pressure causing spray gun vibration, and uneven powder flow causing increased vibration due to changes in spray gun recoil force). Current technology only uses two opposing clamps to secure the plasma spray gun, which results in poor fastening. When the plasma spray gun is subjected to vibration, the fastening position of the plasma spray gun is prone to shift, causing loosening or even falling off, affecting the execution of precise spraying operations.

[0005] Therefore, a spray gun device for plasma spraying is proposed. Summary of the Invention

[0006] The present invention provides a spray gun device for plasma spraying, the purpose of which is to solve the problems mentioned above.

[0007] This invention provides a spray gun device for plasma spraying, comprising a base, a bracket mounted on the upper end of the base, a motor mounted in the center of one surface of the bracket, a lead screw fixed to the drive end of the motor, a moving platform mounted on the outer surface of the lead screw, and a plasma spray gun fastening assembly mounted on the lower end of the moving platform, the plasma spray gun fastening assembly fastening the plasma spray gun.

[0008] Preferably, the plasma spray gun fastening assembly includes a fastening box and a fastening platform A inside the fastening box. The same number of cylinders as the fastening platform A are horizontally mounted on the outer surface of the fastening box. One end of a plunger rod on each cylinder is inserted into the fastening box and fixed to a mounting platform. A mounting interface is provided on the surface of the fastening platform A facing the cylinders. The mounting platform is movably inserted into the mounting interface. A skewed wall A is provided on the side of the mounting interface facing the mounting platform. Skewed wall A is skewed from top to bottom along a direction close to the center of the fastening box. A skewed wall B, contacting skewed wall A, is mounted on the end of the mounting platform facing the mounting interface. A base is mounted on the outer surface of the plunger rod, located to one side of the fastening platform A. A skewed wall C, parallel to skewed wall A, is provided on one outer surface of the fastening platform A. The platform has a pre-reserved inclined wall D parallel to the inclined wall B, and inclined wall D and inclined wall C are attached to each other; a support block is installed at the lower end of the platform, and the support block extends from the center of the fastening box to the lower side of the fastening platform A. A spiral beryllium copper wire A is installed at the lower end of the fastening platform A and is fixed to the support block; an assembly chamber is reserved in the support block, and a fastening platform B is movably installed in the assembly chamber. One side of the fastening platform B extends to the outside of the assembly chamber, and a guide wall is reserved on the other side. The guide wall is inclined from top to bottom from the position close to the platform. The fastening platform B is connected to the assembly chamber via the spiral beryllium copper wire B; a traction platform is installed at the upper end of the support block. The lower end of the traction platform is inside the assembly chamber and faces the guide wall, and the upper end of the traction platform faces the fastening platform A. The traction platform is connected to the support block via the spiral beryllium copper wire C.

[0009] Preferably, a constraint block is installed on the outer surface of the plunger rod, and the constraint block is arranged in a ring along the plunger rod, with the platform located between the fastening platform A and the constraint block.

[0010] Preferably, a positioning ring A is installed at the notch at the top of the fastening box, and a positioning ring B is installed inside the positioning ring A.

[0011] Preferably, a pair of cylinders are installed. The cylinders are supplied with air pressure by an air pump. The air pump has an intake passage and an exhaust passage. The pair of cylinders are connected to the intake passage through passage one, and the pair of cylinders are connected to the exhaust passage through passage two.

[0012] Preferably, a cover is installed at the upper end of the fastening box, and a mating plate is installed at the lower end of the fastening box, with positioning rings installed at the upper end of the cover.

[0013] Preferably, the lower end of the box cover and the upper end of the fastening platform are in contact.

[0014] The beneficial effects of this invention are as follows:

[0015] This invention incorporates a fastening platform B, with one end of the platform arched. One end of the fastening platform B is aligned with a fastening plate. When the fastening platform B and the fastening plate together fasten the plasma spray gun, if the fastening is prolonged or a leak occurs in the pneumatic system, the piston rods of a pair of cylinders may slightly retract. At this moment, the plasma spray gun, under its own weight, will exhibit a slight downward movement. Due to the initial fastening force, the fastening plate and the plasma spray gun have a damping effect, which in turn pulls the fastening platform A downward along the inclined wall A of the interlocking platform. In cooperation with the skewed wall B, the downward movement of a pair of clamping platforms A reduces the distance between them (self-adjusting to compensate for minor changes in the length of the plunger rod), allowing the ring-shaped clamping plates to more firmly secure the plasma spray gun. Furthermore, the downward movement of clamping platform A pulls the traction platform downward. After the traction platform moves downward, it presses down on the first guide wall. After the first guide wall bears the downward pressure, it can distribute this force to the lateral position through its own skewed wall, thereby causing clamping platform B to move outward as well, more fully securing the plasma spray gun.

[0016] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the plasma spray gun fastening assembly and the plasma spray gun of the present invention.

[0020] Figure 3 This is a schematic diagram of the plasma spray gun fastening assembly structure of the present invention;

[0021] Figure 4 This is a top view of the plasma spray gun fastening assembly of the present invention;

[0022] Figure 5 These are cross-sectional views from embodiments 1-3 of the present invention;

[0023] Figure 6 This is a schematic diagram of the pedestal and fastening platform A structure in embodiments 1-3 of the present invention;

[0024] Figure 7 This is a schematic diagram of the hydraulic cylinder structure of the present invention;

[0025] Figure 8 This is a cross-sectional view of Embodiment 4 of the present invention;

[0026] Figure 9 For the present invention Figure 8 Enlarged diagram at point X in the diagram;

[0027] Figure 10 This is a schematic diagram of the pedestal and fastening platform B structure in Embodiment 4 of the present invention;

[0028] Reference numerals: 1. Base; 2. Bracket; 3. Motor; 4. Lead screw; 5. Variable platform; 6. Plasma spray gun fastening assembly; 61. Fastening box; 62. Cylinder; 63. Box cover; 64. Connecting plate; 65. Exhaust port; 66. Air inlet; 67. Plunger rod; 68. Constraint block; 69. Platform; 610. Support block; 611. Spiral beryllium copper wire A; 612. Fastening platform A; 613. Tightening 614. Mounting plate; 615. Mounting interface; 616. Slanted wall A; 617. Slanted wall B; 618. Slanted wall C; 619. Positioning ring A; 620. Positioning ring B; 630. Slanted wall D; 631. Assembly chamber; 632. Fastening platform B; 633. Guide wall; 634. Spiral beryllium copper wire B; 635. Traction platform; 636. Spiral beryllium copper wire C; 7. Plasma spray gun. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] Reference Figure 1 and Figure 2 A spray gun device for plasma spraying includes a base 1, a bracket 2 mounted on the upper end of the base 1, a motor 3 mounted in the center of one surface of the bracket 2, a lead screw 4 fixed to the drive end of the motor 3, a moving platform 5 mounted on the outer surface of the lead screw 4, a plasma spray gun fastening assembly 6 mounted on the lower end of the moving platform 5, and a plasma spray gun fastening assembly 6 fastening a plasma spray gun 7.

[0031] Reference Figure 3 and Figure 6, the plasma spray gun fastening assembly 6 includes a fastening box 61 and a fastening platform A612 inside the fastening box 61. On the outer surface of the fastening box 61, a same number of cylinders 62 as the fastening platform A612 are horizontally installed. One end of the plunger rod 67 on the cylinder 62 penetrates into the fastening box 61 and is fixed to the insertion platform 615; on one surface of the fastening platform A612 facing the cylinder 62, an insertion port 614 is reserved. The insertion platform 615 can be movably inserted into the insertion port 614. On one side surface of the insertion port 614 facing the insertion platform 615, an inclined wall A616 is reserved. The inclined wall A616 is inclined from top to bottom along the direction approaching the center of the fastening box 61. On one end of the insertion platform 615 facing the insertion port 614, an inclined wall B617 contacting the inclined wall A616 is installed. Fastening plates 613 of various sizes can be assembled to fasten plasma spray guns 7 of various models (to improve the fastening stability, the inner surface of the fastening plate 613 reserves a concave surface matching the plasma spray gun 7, and plasma spray guns 7 of various models match fastening plates 613 of various sizes). On one outer surface of the fastening platform A612, a number of trapezoidal grooves arranged in a circle are reserved. Fastening plates 613 of various sizes can be inserted into the trapezoidal grooves on one outer surface of the fastening platform A612; the insertion port 614 is a "丄"-shaped insertion port 614 arranged side by side with the inclined wall A616. The insertion platform 615 is adapted to this "丄"-shaped insertion port 614. The inclined wall A616 on the insertion port 614 is closely attached to the inclined wall A616 of the insertion platform 615, enabling the fastening platform A612 to move downward along the direction of the inclined wall A616 (reversibly movable within a specific range); the cylinder 62 is fixed to the outer surface of the fastening box 61. The plunger rod 67 of the cylinder 62 penetrates into the inside of the fastening box 61. The cylinder 62 is provided with an air inlet 66 and an air outlet 65, which respectively play the roles of adding gas into the cylinder 62 and exhausting gas out of the cylinder 62, enabling the plunger rod 67 to protrude or retract; the protrusion of the plunger rod 67 pulls the insertion platform 615 to move. The insertion platform 615 presses the fastening platform A612 to move and pulls the fastening plate 613 to move, thereby enabling the fastening plate 613 to fasten the plasma spray gun 7. When the plasma spray gun 7 is fastened, if it is fastened for too long or there is air leakage in the pneumatic system, causing a slight retraction of the plunger rods 67 of a pair of cylinders 62, at this moment, due to the influence of its own weight, the plasma spray gun 7 will have a slight downward movement tendency. Due to the initial fastening force, there is a damping effect between the fastening plate 613 and the plasma spray gun 7, thereby pulling the fastening platform A612 to move downward along the inclined wall A616 of the insertion platform 615. Through the cooperation of the inclined wall A616 and the inclined wall B617, the downward movement of a pair of fastening platforms A612 can reduce the distance between them (self-adjusting to compensate for the length of the slight movement of the plunger rod 67), enabling the fastening plates 613 arranged in a circle to fasten the plasma spray gun 7 more firmly. If the plasma spray gun 7 has a slight downward movement tendency under the influence of its own weight, it can make the fastening plate 613 fasten the plasma spray gun 7 more firmly, preventing the plasma spray gun 7 from falling off.Subsequently, through the inclined wall A616 installed on the interlocking platform 615 and the inclined wall B617 installed in the interlocking interface 614 on the fastening platform A612, when the plasma spray gun 7 moves downward under its own weight, the cooperation of the inclined wall A616 and the inclined wall B617 allows the pair of fastening platforms A612 to move downward, which reduces the distance between them. This allows the fastening plates 613 arranged in a ring to more firmly fasten the plasma spray gun 7, preventing the plasma spray gun 7 from loosening and falling off.

[0032] Reference Figure 5 and Figure 6 A base 69 is mounted on the outer surface of the plunger rod 67. The base 69 is located on one side of the fastening platform A612. An outer surface of the fastening platform A612 has a pre-reserved inclined wall C618 parallel to the inclined wall A616. An outer surface of the base 69 facing the fastening platform A612 has a pre-reserved inclined wall D630 parallel to the inclined wall B617. The inclined wall D630 and the inclined wall C618 are in contact.

[0033] Reference Figure 5 A constraint block 68 is mounted on the outer surface of the plunger rod 67, and the constraint block 68 is arranged in a ring along the plunger rod 67. The platform 69 is located between the fastening table A612 and the constraint block 68. The constraint block 68 and the platform 69 cooperate to fasten the platform 69 to the outer surface of the plunger rod 67, allowing the platform 69 to move with the plunger rod 67. In addition, the constraint block 68 facilitates the assembly of the platform 69. When assembling the platform 69, the fastening table A612 is placed over the constraint block 68, and the interface 614 on the fastening table A612 and the engagement table 615 on the plunger rod 67 are engaged to achieve constraint on the platform 69.

[0034] Reference Figure 5 A support block 610 is installed at the lower end of the base 69. The support block 610 extends from near the center of the fastening box 61 to the lower side of the fastening platform A612. A spiral beryllium copper wire A611, which is fixed to the support block 610, is installed at the lower end of the fastening platform A612. A notch is reserved at the lower end of the fastening platform A612 for mounting the spiral beryllium copper wire A611, which helps the fastening platform A612 to return to its position.

[0035] ‌

[0036] Example 2

[0037] Reference Figure 5 In this embodiment, a positioning ring A619 is installed at the notch at the upper end of the fastening box 61, and a positioning ring B620 is installed in the positioning ring A619. The positioning ring B620 can maintain the consistency of vertical movement of the plasma spray gun 7, which is easy and convenient to assemble (eliminating the misalignment of the fastening position of the plasma spray gun 7 caused by the different driving strokes of a pair of cylinders 62).

[0038] Example 3

[0039] Reference Figure 5 In this embodiment, a pair of cylinders 62 are installed. The cylinders 62 are supplied with air pressure by an air pump, which has an inlet channel and an outlet channel. The pair of cylinders 62 are connected to the inlet channel via passage one, and the pair of cylinders 62 are connected to the outlet channel via passage two. Because the pair of cylinders 62 are connected to the air pump via a common inlet channel, outlet channel, and air pump, even if the drive strokes of the pair of cylinders 62 are not consistent, the plasma spray gun 7 will not be shifted during fastening. Since the lateral movement of the plasma spray gun 7 is constrained by the positioning ring, the cylinder 62 on the side that first contacts the fastening plate 613 of the plasma spray gun 7 will have its air pressure increased due to the constraint of its movement, and the ejection rate of the other cylinder 62 will increase, thereby fastening the plasma spray gun 7.

[0040] Reference Figure 3 In this embodiment, a cover 63 is installed on the upper end of the fastening box 61, and a mating plate 64 is installed on the lower end of the fastening box 61. Positioning rings A619 and B620 are installed on the upper end of the cover 63. The lower end of the cover 63 is in contact with the upper end of the fastening platform A612, and the upper end of the mating plate 64 is fixedly connected to the lower end of the moving platform 5.

[0041] Example 4

[0042] Refer to 8 and Figure 10 In this embodiment, the support block 610 has a reserved assembly chamber 631, in which a fastening platform B632 is movably installed. One side of the fastening platform B632 extends to the outside of the assembly chamber 631, and the other side has a reserved guide wall 633. The guide wall 633 is tilted from top to bottom along the direction close to the platform 69. The fastening platform B632 is connected to the assembly chamber 631 via a spiral beryllium copper wire B634. A traction platform 635 is installed at the upper end of the support block 610. The lower end of the traction platform 635 is inside the assembly chamber 631 and faces the guide wall 633. The upper end of the traction platform 635 faces the fastening platform A612. The traction platform 635 is connected to the support block 610 via a spiral beryllium copper wire C636.

[0043] One end of the fastening platform B632 is arched, and one end of the fastening platform B632 is aligned with the fastening plate 613. When the fastening platform B632 and the fastening plate 613 are fastened together to the plasma spray gun 7, if the fastening is prolonged or if there is air leakage in the pneumatic system, the plunger rods 67 of a pair of cylinders 62 will retract slightly. At this moment, the plasma spray gun 7 will show a slight downward movement under its own weight. Due to the initial fastening force, the fastening plate 613 and the plasma spray gun 7 have a damping effect, which in turn pulls the fastening platform A612 to move downward along the inclined wall A616 of the interlocking platform 615. With the cooperation of wall B617, the downward movement of a pair of fastening platforms A612 reduces the distance between them (self-adjusting to compensate for minor changes in the length of the plunger rod 67), allowing the ring-shaped fastening plates 613 to more firmly fasten the plasma spray gun 7. Furthermore, the downward movement of fastening platform A612 can pull the traction platform 635 downward. After the traction platform 635 moves downward, it presses down on the first guide wall 633. After the first guide wall 633 bears the downward pressure, it can split this force into a lateral position through its own inclined wall, thereby causing the fastening platform B632 to move outward together, more fully fastening the plasma spray gun 7.

[0044] The working principle of this invention is as follows:

[0045] The air pump provides gas for the cylinder 62 to tighten, driving a pair of platforms 69 to move in the opposite direction, which in turn pulls the fastening plate 613 to tighten the plasma spray gun 7 (even if the driving strokes of the pair of cylinders 62 are not consistent, the plasma spray gun 7 will not be shifted due to tightening. Since the plasma spray gun 7 is constrained by the positioning ring to move laterally, the cylinder 62 on the side of the fastening plate 613 that first contacts the plasma spray gun 7 will have its air pressure increased due to the constraint of its movement, and the ejection rate of the other cylinder 62 will increase, thus tightening the plasma spray gun 7). After the air pressure value for tightening the plasma spray gun 7 (which can form a tightening force) reaches the preset value, the pneumatic switch in the pneumatic system will be activated and closed, automatically cutting off the air supply to the pair of cylinders 62 (automatically determining whether the tightening is sufficient and stopping the air supply).

[0046] The principle of self-adjustment to prevent the plasma spray gun 7 from falling off: When the plasma spray gun 7 is tightened, if the tightening is too long or there is an air leak in the pneumatic system, the plunger rods 67 of the pair of cylinders 62 will retract slightly. At this time, the plasma spray gun 7 will have a slight downward movement under its own weight. Based on the initial tightening force, the fastening plate 613 and the plasma spray gun 7 have a damping effect, which in turn pulls the fastening platform A612 to move downward along the inclined wall A616 of the interlocking platform 615. Through the cooperation of the inclined wall A616 and the inclined wall B617, the downward movement of the pair of fastening platforms A612 can reduce the distance between them (self-adjustment to compensate for the slight change in the length of the plunger rods 67), so that the fastening plates 613 arranged in a ring can more firmly tighten the plasma spray gun 7. If the plasma spray gun 7 experiences a slight downward tilt due to its own weight, the fastening plate 613 can securely fasten the plasma spray gun 7 more firmly, preventing it from falling. Furthermore, through the inclined wall A616 installed on the interlocking platform 615 and the inclined wall B617 installed in the interlocking interface 614 on the fastening platform A612, when the plasma spray gun 7 tilts downward due to its own weight, the cooperation of the inclined walls A616 and B617 reduces the distance between the pair of fastening platforms A612 as they tilt downward. This allows the circularly arranged fastening plates 613 to more firmly fasten the plasma spray gun 7, preventing it from loosening and falling.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A spray gun device for plasma spraying, characterized in that: It includes a base, a bracket is installed on the upper end of the base, a motor is installed in the center of one surface of the bracket, the drive end of the motor is fixed to a lead screw, a moving platform is installed on the outer surface of the lead screw, and a plasma spray gun fastening assembly is installed at the lower end of the moving platform, which fastens the plasma spray gun.

2. The spray gun device for plasma spraying according to claim 1, characterized in that: The plasma spray gun fastening assembly includes a fastening box and a fastening platform A inside the fastening box. The same number of cylinders as the fastening platform A are horizontally installed on the outer surface of the fastening box. One end of the plunger rod on the cylinder is inserted into the fastening box and fixed to the insertion platform. The surface of the fastening platform A facing the cylinder has a reserved insertion interface. The insertion platform can be movably inserted into the insertion interface. The side of the insertion interface facing the insertion platform has a reserved inclined wall A. The inclined wall A is inclined from top to bottom along a direction close to the center of the fastening box. An inclined wall B that contacts the inclined wall A is installed at the end of the insertion platform facing the insertion interface. A platform is installed on the outer surface of the plunger rod. The platform is located on one side of the fastening platform A. An inclined wall C is reserved on one outer surface of the fastening platform A, which is parallel to the inclined wall A. An inclined wall D is reserved on one outer surface of the platform facing the fastening platform A, which is parallel to the inclined wall B. The inclined wall D and the inclined wall C are in contact. A support block is installed at the lower end of the base. The support block extends from the center of the fastening box to the lower side of the fastening platform A. A spiral beryllium copper wire A is installed at the lower end of the fastening platform A and is fixed to the support block. An assembly chamber is reserved in the support block, and a fastening platform B is movably installed in the assembly chamber. One side of the fastening platform B extends to the outside of the assembly chamber, and the other side is reserved with a guide wall. The guide wall is tilted from top to bottom along the direction close to the platform. The fastening platform B is connected to the assembly chamber via a spiral beryllium copper wire B. A traction platform is installed at the upper end of the support block. The lower end of the traction platform is inside the assembly chamber and faces the guide wall. The upper end of the traction platform faces the fastening platform A. The traction platform is connected to the support block via a spiral beryllium copper wire C.

3. The spray gun device for plasma spraying according to claim 2, characterized in that: Constraint blocks are installed on the outer surface of the plunger rod, and the constraint blocks are arranged in a ring along the plunger rod. The platform is located between the fastening platform A and the constraint blocks.

4. A spray gun device for plasma spraying according to any one of claims 2-3, characterized in that: A positioning ring A is installed at the notch at the top of the fastening box, and a positioning ring B is installed inside the positioning ring A.

5. A spray gun device for plasma spraying according to any one of claims 2-3, characterized in that: A pair of cylinders are installed. The cylinders are supplied with air pressure by an air pump. The air pump has an intake passage and an exhaust passage. The pair of cylinders are connected to the intake passage through passage one, and the pair of cylinders are connected to the exhaust passage through passage two.

6. A spray gun device for plasma spraying according to claim 4, characterized in that: The upper part of the fastening box is equipped with a box cover, and the lower part of the fastening box is equipped with a docking plate. The positioning ring and the positioning ring are installed on the upper part of the box cover.

7. A spray gun device for plasma spraying according to claim 6, characterized in that: The lower end of the box cover is attached to the upper end of the fastening platform.

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