Nozzle for plasma spraying

Abstract

The utility model relates to a spray nozzle for plasma spraying, which belongs to the technical field of spray nozzles for plasma spraying and comprises a gun body, limiting blocks are arranged on the left side and the right side of an inner cavity of the gun body, a tungsten electrode rod is placed in the gun body, and a tungsten electrode body is arranged at the bottom end of the tungsten electrode rod. According to the nozzle for plasma spraying, a nozzle body in a gun body is made of red copper and connected with a positive electrode of a power source, a tungsten electrode body in the gun body is made of cerium tungsten alloy and connected with a negative electrode of the power source, and during work, threaded rods on the left side and the right side are driven to rotate in connecting plates on the left side and the right side and move in the opposite directions; and spring telescopic rods on the left side and the right side are compressed, the opposite sides of clamping frames on the left side and the right side are moved out of clamping grooves in the left side and the right side, at the moment, a fixing plate can be pulled out of the gun body, then a tungsten electrode rod and a tungsten electrode body are taken out for overhauling, and therefore the tungsten electrode rod and the tungsten electrode body can be disassembled and overhauled conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of plasma spraying nozzles, in particular to a plasma spraying nozzle. Background Art

[0002] Plasma spraying technology uses a plasma arc driven by direct current as a heat source to heat materials such as ceramics, alloys and metals to a molten or semi-molten state, and sprays them at high speed onto the pre-treated workpiece surface to form a firmly adhered surface layer.

[0003] For example, Chinese patent CN215847543U discloses a novel plasma spraying nozzle, which includes a front gun body and a rear gun body, both of which are hollow structures. The front gun body and the rear gun body are connected by an insulator. A tungsten electrode is built into the center of the rear gun body, and the end of the tungsten electrode extends to the installation position of the front gun body and the rear gun body. A feed pipe for a mixture of compressed gas and powder is opened on the side wall of the rear gun body. A connected feed channel is opened on the front gun body and the rear gun body. The feed channel is annular and conical and is arranged around the end of the tungsten electrode; the front gun body is built into the nozzle, and a nozzle gland is installed outside the nozzle to fix the nozzle on the front gun body. The utility model has a simple structure, a reasonable design, easy operation, and a good spraying effect. Cooling water takes away the heat of the front gun body and the rear gun body, effectively ensuring the thermal enthalpy of the plasma arc and improving energy utilization.

[0004] With the development of materials science, the requirements for plasma spraying are becoming increasingly higher. High-power plasma spraying is one of the development trends. The key lies in the high-power plasma spray gun. In the above-mentioned patent, the tungsten pole rod is arranged inside the gun body through a thread. When the tungsten pole rod and the tungsten pole body are disassembled for maintenance, the process is relatively cumbersome, which reduces practicality. Utility Model Content

[0005] In response to the shortcomings of the existing technology, the utility model provides a nozzle for plasma spraying, which has the advantages of easy disassembly and maintenance of the tungsten pole rod and the tungsten pole body, and solves the problem that the tungsten pole rod is set inside the gun body through a thread, and the process of disassembling the tungsten pole rod and the tungsten pole body for maintenance is relatively cumbersome, which reduces practicality.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a plasma spraying nozzle, comprising a gun body, wherein limit blocks are provided on both left and right sides of an inner cavity of the gun body, a tungsten pole rod is placed inside the gun body, a tungsten pole body is provided at the bottom end of the tungsten pole rod, and the left and right sides of the tungsten pole body are both in contact with the sides opposite to the left and right limit blocks, a locking mechanism is provided on the upper surface of the gun body, a nozzle cover is provided at the bottom end of the gun body, the upper surface of the nozzle cover is connected to the nozzle body, and the nozzle body is located inside the gun body;

[0007] The locking mechanism includes a fixing plate, a rubber ring, a limiting plate, two first springs, two fixing grooves, two spring telescopic rods and a connecting assembly, the lower surface of the rubber ring is in contact with the upper surface of the gun body, the rubber ring is arranged on the lower surface of the fixing plate, the limiting plate is arranged on the lower surface of the fixing plate and is located inside the rubber ring, the limiting plate is located inside the gun body, and the gaps are matched, the two first springs are both arranged on the lower surface of the limiting plate, the two fixing grooves are both opened on the left and right sides of the upper surface of the gun body, and the two spring telescopic rods are both arranged on the side walls opposite to each other in the inner cavity of the left and right fixing grooves;

[0008] The connecting assembly includes two brackets, two connecting plates, two threaded rods, two handles and two slots, the two brackets are arranged on the opposite side of the left and right spring telescopic rods, the brackets are slidably connected to the inside of the fixed slot, the two connecting plates are arranged on the left and right sides of the upper surface of the gun body, the threaded rods are threadedly connected to the inside of the connecting plate, the opposite sides of the left and right threaded rods are rotatably connected to the opposite sides of the left and right brackets through bearings, the two handles are arranged on the opposite sides of the left and right threaded rods, the two slots are opened on the left and right sides of the fixed plate, and the opposite sides of the left and right brackets are slidably inserted into the inside of the left and right slots.

[0009] By adopting this technical solution, it is easy to disassemble and repair the tungsten electrode rod and the tungsten electrode body.

[0010] Furthermore, the spring telescopic rod includes a first slide rod, the interior of the first slide rod is slidably connected to a second slide rod, the outer side of the first slide rod is movably sleeved with a second spring, and the lower surface of the first spring is in contact with the top of the tungsten electrode body.

[0011] By adopting this technical solution, the opposite sides of the left and right card racks can be slidably inserted into the left and right card slots through the reset elastic force of the left and right spring telescopic rods.

[0012] Furthermore, the limiting plate moves linearly up and down inside the gun body.

[0013] By adopting this technical solution, the limiting plate can be inserted into the interior of the gun body.

[0014] Furthermore, a first annular groove is provided inside the gun body, a second annular groove is provided inside the gun body, the first annular groove is located above the second annular groove, and a connecting groove is provided inside the gun body, the connecting grooves are connected to the first annular groove and the second annular groove.

[0015] By adopting this technical solution, cooling water can flow inside the first annular groove, the second annular groove and the connecting groove, thereby facilitating cooling of the gun body.

[0016] Furthermore, a feed pipe is provided on the right side of the gun body, a feed channel is opened inside the gun body, and the left side of the feed pipe is connected to the right side of the feed channel.

[0017] By adopting this technical solution, powder is transported in the feed pipe, and the powder reaches the interior of the gun body through the feed channel.

[0018] Furthermore, an insulating and heat-insulating layer is provided on the outer side of the gun body, and the insulating and heat-insulating layer is a rubber layer.

[0019] By adopting this technical solution, the gun body can be insulated and heat-insulated through the insulating and heat-insulating layer.

[0020] Furthermore, the first springs on the left and right sides are symmetrically distributed on the left and right sides of the longitudinal center axis of the limiting plate.

[0021] By adopting this technical solution, when the fixing plate is fixed to the upper surface of the gun body, the first springs on the left and right sides are in a state of minimum compression.

[0022] Furthermore, the fixing plate is a hard plastic block, and the card holder matches the gap between the card slots.

[0023] By adopting this technical solution, the opposite sides of the left and right side brackets are slidably inserted into the left and right side slots, and the fixing plate can be fixed to the upper surface of the gun body.

[0024] Compared with the existing technology, the technical solution of this application has the following beneficial effects:

[0025] The plasma spraying nozzle has a nozzle body in the gun body made of red copper and connected to the positive pole of the power supply, and a tungsten electrode body inside the gun body made of cerium tungsten alloy and connected to the negative pole of the power supply. During operation, high voltage is transmitted to the discharge area at the nozzle body through the tungsten electrode body, and the active elements in the airflow will generate an arc in the discharge area, and the powder will be sprayed onto the surface of the workpiece through the active airflow through the nozzle body and the nozzle cover. When the tungsten electrode rod and the tungsten electrode body inside the gun body are taken out for maintenance, the left and right handles can be rotated to drive the left and right threaded rods to rotate inside the left and right connecting plates and move in opposite directions, the left and right spring telescopic rods are compressed, and the opposite sides of the left and right brackets are moved out of the left and right slots. At this time, the fixing plate can be pulled out from the inside of the gun body, and then the tungsten electrode rod and the tungsten electrode body can be taken out for maintenance, thereby facilitating the disassembly and maintenance of the tungsten electrode rod and the tungsten electrode body. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of the utility model;

[0027] Figure 2This is a schematic diagram of the locking mechanism of the utility model;

[0028] Figure 3 It is a schematic diagram of the three-dimensional structure of the fixing plate of the utility model.

[0029] In the figure: 1. Gun body; 2. Limit block; 3. Tungsten electrode rod; 4. Tungsten electrode body; 5. Clamping mechanism; 51. Fixing plate; 52. Rubber ring; 53. Limiting plate; 54. First spring; 55. Fixing groove; 56. Spring telescopic rod; 571. Clamping bracket; 572. Connecting plate; 573. Threaded rod; 574. Handle; 575 Clamping groove; 6. Nozzle cover; 7. Nozzle body; 8. First annular groove; 9. Second annular groove; 10. Connecting groove; 11. Feed pipe; 12. Feed channel; 13. Insulation layer. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] See also Figure 1 The plasma spraying nozzle in this embodiment includes a gun body 1, and limit blocks 2 are provided on the left and right sides of the inner cavity of the gun body 1. A tungsten pole rod 3 is placed inside the gun body 1, and a tungsten pole body 4 is provided at the bottom end of the tungsten pole rod 3. The left and right sides of the tungsten pole body 4 are both in contact with the side opposite to the left and right limit blocks 2. A locking mechanism 5 is provided on the upper surface of the gun body 1, which facilitates the disassembly and maintenance of the tungsten pole rod 3 and the tungsten pole body 4. A nozzle cover 6 is provided at the bottom end of the gun body 1, and the upper surface of the nozzle cover 6 is connected to the nozzle body 7, which is located inside the gun body 1.

[0032] In this embodiment, a first annular groove 8 is provided inside the gun body 1, a second annular groove 9 is provided inside the gun body 1, the first annular groove 8 is located on the upper side of the second annular groove 9, a connecting groove 10 is provided inside the gun body 1, and the connecting groove 10 is connected with the first annular groove 8 and the second annular groove 9, a feed pipe 11 is provided on the right side of the gun body 1, a feed channel 12 is provided inside the gun body 1, and the left side of the feed pipe 11 is connected with the right side of the feed channel 12, and an insulating and heat-insulating layer 13 is provided on the outside of the gun body 1, and the insulating and heat-insulating layer 13 is a rubber layer.

[0033] It should be noted that the nozzle body 7 in the gun body 1 is made of red copper and is connected to the positive pole of the power supply. The tungsten electrode body 4 inside the gun body 1 is made of cerium-tungsten alloy and is connected to the negative pole of the power supply. During operation, high voltage is transmitted to the discharge area at the nozzle body 7 through the tungsten electrode body 4. The active elements in the airflow will generate an arc in the discharge area, and the powder will be sprayed onto the surface of the workpiece through the active airflow through the nozzle body 7 and the nozzle cover 6.

[0034] See also Figures 2 to 3 In order to facilitate the disassembly and maintenance of the tungsten electrode rod 3 and the tungsten electrode body 4, in this embodiment, the locking mechanism 5 includes a fixing plate 51, a rubber ring 52, a limiting plate 53, two first springs 54, two fixing grooves 55, two spring telescopic rods 56 and a connecting assembly. The lower surface of the rubber ring 52 is in contact with the upper surface of the gun body 1, and the rubber ring 52 is arranged on the lower surface of the fixing plate 51.

[0035] In this embodiment, the limit plate 53 is arranged on the lower surface of the fixed plate 51 and is located inside the rubber ring 52. The limit plate 53 is located inside the gun body 1, and the gaps are matched. The two first springs 54 are both arranged on the lower surface of the limit plate 53, and the two fixing grooves 55 are both opened on the left and right sides of the upper surface of the gun body 1. The two spring telescopic rods 56 are both arranged on the side walls opposite to the inner cavity of the left and right fixing grooves 55.

[0036] In this embodiment, a water inlet pipe is connected to the right side of the gun body 1, and a water outlet pipe is connected to the right side of the gun body 1 and located below the water inlet pipe. The water inlet pipe is connected to the first annular groove 8, and the water outlet pipe is connected to the second annular groove 9. Through the cooperation between the water outlet pipe, the water inlet pipe, the first annular groove 8, the second annular groove 9 and the connecting groove 10, the heat in the gun body 1 can be taken away, thereby effectively ensuring the thermal enthalpy of the plasma arc and improving energy utilization.

[0037] In this embodiment, the connecting assembly includes two brackets 571, two connecting plates 572, two threaded rods 573, two handles 574 and two slots 575. The two brackets 571 are arranged on the opposite side of the left and right spring telescopic rods 56. The brackets 571 are slidably connected to the inside of the fixed slot 55. The two connecting plates 572 are arranged on the left and right sides of the upper surface of the gun body 1, and the threaded rods 573 are threadedly connected to the inside of the connecting plates 572.

[0038] In this embodiment, the opposite sides of the left and right threaded rods 573 are rotatably connected to the opposite sides of the left and right brackets 571 through bearings, the two handles 574 are arranged on the opposite sides of the left and right threaded rods 573, and the two slots 575 are opened on the left and right sides of the fixed plate 51.

[0039] In this embodiment, the opposite sides of the left and right side brackets 571 are slidably inserted into the left and right side slots 575, the spring telescopic rod 56 includes a first slide bar, the interior of the first slide bar is slidably connected to the second slide bar, the outer side of the first slide bar is movably sleeved with a second spring, the lower surface of the first spring 54 is in contact with the top of the tungsten electrode body 4, the limit plate 53 moves linearly up and down inside the gun body 1, the left and right first springs 54 are symmetrically distributed on the left and right sides of the longitudinal center axis of the limit plate 53, the fixing plate 51 is a hard plastic block, and the gap between the bracket 571 and the slot 575 matches.

[0040] It should be noted that the left and right handles 574 can be rotated to drive the left and right threaded rods 573 to rotate inside the left and right connecting plates 572 and move in opposite directions, driving the left and right brackets 571 to move in opposite directions, compressing the left and right spring telescopic rods 56, and then moving the opposite sides of the left and right brackets 571 out of the left and right slots 575. At this time, the fixing plate 51 can be pulled out from the inside of the gun body 1, and then the tungsten pole rod 3 and the tungsten pole body 4 can be taken out for inspection, thereby facilitating the disassembly and inspection of the tungsten pole rod 3 and the tungsten pole body 4.

[0041] The working principle of the above embodiment is:

[0042] The nozzle body 7 in the gun body 1 is made of copper and connected to the positive pole of the power supply. The tungsten electrode body 4 inside the gun body 1 is made of cerium-tungsten alloy and connected to the negative pole of the power supply. When working, high voltage is transmitted to the discharge area of ​​the nozzle body 7 through the tungsten electrode body 4. The active elements in the airflow will generate an arc in the discharge area, and the powder will be sprayed onto the surface of the workpiece through the active airflow through the nozzle body 7 and the nozzle cover 6. When the tungsten electrode rod 3 and the tungsten electrode body 4 inside the gun body 1 are taken out for maintenance, the handles 574 on the left and right sides can be turned. , driving the left and right threaded rods 573 to rotate inside the left and right connecting plates 572 and move in opposite directions, driving the left and right brackets 571 to move in opposite directions, the left and right spring telescopic rods 56 are compressed, and then the opposite sides of the left and right brackets 571 are moved out of the left and right side slots 575. At this time, the fixing plate 51 can be pulled out from the inside of the gun body 1, and then the tungsten pole rod 3 and the tungsten pole body 4 can be taken out for maintenance, which makes it easier to disassemble and repair the tungsten pole rod 3 and the tungsten pole body 4.

Claims

1. A plasma spraying nozzle, comprising a gun body (1), characterized in that: The left and right sides of the inner cavity of the gun body (1) are both provided with limit blocks (2), a tungsten pole rod (3) is placed inside the gun body (1), a tungsten pole body (4) is provided at the bottom end of the tungsten pole rod (3), the left and right sides of the tungsten pole body (4) are both fitted with the sides opposite to the left and right limit blocks (2), a locking mechanism (5) is provided on the upper surface of the gun body (1), a nozzle cover (6) is provided at the bottom end of the gun body (1), the upper surface of the nozzle cover (6) is connected to the nozzle body (7), and the nozzle body (7) is located inside the gun body (1); The locking mechanism (5) includes a fixing plate (51), a rubber ring (52), a limiting plate (53), two first springs (54), two fixing grooves (55), two spring telescopic rods (56) and a connecting assembly, wherein the lower surface of the rubber ring (52) is in contact with the upper surface of the gun body (1), the rubber ring (52) is arranged on the lower surface of the fixing plate (51), the limiting plate (53) is arranged on the lower surface of the fixing plate (51) and is located inside the rubber ring (52), the limiting plate (53) is located inside the gun body (1) and the gaps are matched, the two first springs (54) are both arranged on the lower surface of the limiting plate (53), the two fixing grooves (55) are both opened on the left and right sides of the upper surface of the gun body (1), and the two spring telescopic rods (56) are both arranged on the side walls opposite to the inner cavity of the left and right fixing grooves (55); The connecting assembly comprises two brackets (571), two connecting plates (572), two threaded rods (573), two handles (574) and two slots (575). The two brackets (571) are arranged on opposite sides of the left and right spring telescopic rods (56). The brackets (571) are slidably connected to the inside of the fixed slot (55). The two connecting plates (572) are arranged on the left and right sides of the upper surface of the gun body (1). The threaded rods (573) are threadedly connected to the inside of the connecting plates (572). The opposite sides of the left and right threaded rods (573) are rotatably connected to the opposite sides of the left and right brackets (571) through bearings. The two handles (574) are arranged on the opposite sides of the left and right threaded rods (573). The two slots (575) are opened on the left and right sides of the fixed plate (51). The opposite sides of the left and right brackets (571) are slidably inserted into the inside of the left and right slots (575).

2. The plasma spraying nozzle according to claim 1, wherein: The spring telescopic rod (56) includes a first slide rod, the interior of the first slide rod is slidably connected to a second slide rod, the outer side of the first slide rod is movably sleeved with a second spring, and the lower surface of the first spring (54) is in contact with the top of the tungsten electrode body (4).

3. The plasma spraying nozzle according to claim 1, wherein: The limiting plate (53) moves linearly up and down inside the gun body (1).

4. The plasma spraying nozzle according to claim 1, wherein: A first annular groove (8) is provided inside the gun body (1), a second annular groove (9) is provided inside the gun body (1), the first annular groove (8) is located on the upper side of the second annular groove (9), and a connecting groove (10) is provided inside the gun body (1), and the connecting groove (10) is connected to the first annular groove (8) and the second annular groove (9).

5. The plasma spraying nozzle according to claim 1, wherein: A feed pipe (11) is provided on the right side of the gun body (1), a feed channel (12) is provided inside the gun body (1), and the left side of the feed pipe (11) is connected to the right side of the feed channel (12).

6. The plasma spraying nozzle according to claim 1, wherein: An insulating and heat-insulating layer (13) is provided on the outside of the gun body (1), and the insulating and heat-insulating layer (13) is a rubber layer.

7. The plasma spraying nozzle according to claim 1, wherein: The first springs (54) on the left and right sides are symmetrically distributed on the left and right sides of the longitudinal center axis of the limiting plate (53).

8. The plasma spraying nozzle according to claim 1, wherein: The fixing plate (51) is a hard plastic block, and the clearance between the card frame (571) and the card slot (575) matches.

Images