CN216459503U - Spraying pipe for spraying powder and spraying device - Google Patents

Abstract

The utility model discloses a spray pipe for spraying powder and a spraying device. This spray tube includes: outer tube and laval spray tube, the laval spray tube sets up in the outer tube, the lateral wall of laval spray tube is provided with many even benefit powder passageways in interval, many even tonifying qi passageway in interval and air cavity, it is located the periphery of tonifying qi passageway to mend the powder passageway, the round air cavity has in the lateral wall of the laval spray tube of tonifying qi passageway's top, air cavity and tonifying qi passageway's top intercommunication, each tonifying qi passageway communicates through many gas passage that the interval evenly set up from the top down with the inside of laval spray tube, first inlet port has been seted up to the lateral wall of outer tube, first inlet port is located the top of laval spray tube, the second inlet port that link up is seted up to the lateral wall of outer tube and the lateral wall of laval spray tube, second inlet port and air cavity intercommunication. According to the utility model, the gas supplementing channel and the powder supplementing channel are additionally arranged, so that uniform powder feeding is realized, the deposition efficiency and the deposition quality of the coating are improved, and the coating with uniform thickness is formed.

Description

Spraying pipe for spraying powder and spraying device

Technical Field

The utility model relates to the technical field of powder spraying, in particular to a spray pipe for spraying powder and a spraying device.

Background

In the use process of the metal part, the metal part is subjected to uneven loads such as external alternating stress and the like for a long time, and particularly, surface defects such as microcracks and the like are easily generated under the severe working environment. If the metal part with the defects is used continuously, the microcrack defects on the surface can be expanded continuously to form a larger defect area, so that the part is scrapped in advance because the part cannot meet the use requirement, and huge waste of energy and resources is caused. According to statistics, the metal parts scrapped in advance due to surface defects are common in moving machine rotor blades, gears, shaft parts and the like. The method has the advantages that the defect metal surface is repaired by utilizing the advanced laser surface repairing technology, so that the service life of a metal part can be prolonged, the economic loss and the time loss can be reduced, and the method has important application significance particularly for core parts with high added values.

Cold Spraying (CS, also called gas dynamic Spraying) is a technique in which high-speed solid particles with certain plasticity collide with a substrate and undergo strong plastic deformation to deposit and form a coating. Under normal conditions, the general concept is that the solid particles will erode the matrix when they collide with the matrix.

Whether or not the cold-sprayed particles are capable of forming a coating on a substrate depends primarily on the velocity of the particles before they impact the substrate, i.e., the critical velocity V of the particles_p. For each spray material, there is a certain critical velocity V_pWhen the particle speed is higher than the speed, the particles are deposited on the surface of the substrate after collision to form a coating. During the spraying process, in order to bring the sprayed powder to its critical speed, an accelerating gas can be preheated and then fed into the spray gun, typically at a preheating temperature of less than 600 ℃. In addition, in order to obtain a high particle spray velocity, a spherical powder having a small particle size and a small distribution range of powder particles, generally 5 μm to 50 μm, is required.

However, when the high-speed gas accelerates the powder movement, the powder in the conventional spray head is not sprayed at the same speed, and the powder is relatively more at the place with the high speed and less at the place with the low speed, thereby causing the coating to be unevenly distributed on the section of the substrate, and the coating approximately takes the form of thick middle and thin two sides, resulting in low deposition efficiency and seriously affecting the performance of the coating. In summary, conventional showerheads have low deposition efficiency, which limits their widespread use in industry.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a spray pipe for spraying powder and a spraying device, and aims to solve the problem of low spraying deposition efficiency in the prior art.

In a first aspect, there is provided a nozzle for spraying a powder, comprising: the powder replenishing device comprises an outer pipe and a Laval nozzle, wherein the Laval nozzle is arranged in the outer pipe, the top end of the Laval nozzle is lower than the top end of the outer pipe, the side wall of the Laval nozzle is provided with a plurality of uniformly spaced powder replenishing channels, a plurality of uniformly spaced gas replenishing channels and gas cavities, the powder replenishing channels are positioned at the periphery of the gas replenishing channels, the powder replenishing channels and the gas replenishing channels are arranged at intervals, each powder replenishing channel penetrates from the top end of the side wall of the Laval nozzle to the bottom end of the side wall of the Laval nozzle, the top end of the gas replenishing channel is lower than the top end of the powder replenishing channel, the bottom end of the gas replenishing channel is higher than the bottom end of the Laval nozzle, a circle of gas cavities are arranged in the side wall of the Laval nozzle above the gas replenishing channels, the gas cavities are communicated with the top ends of the gas replenishing channels, and each gas replenishing channel is communicated with the plurality of gas channels uniformly spaced from top to bottom inside of the Laval nozzle, the side wall of the outer pipe is provided with a first air inlet which is positioned above the Laval nozzle, the side wall of the outer pipe and the side wall of the Laval nozzle are provided with a second air inlet which is communicated, and the second air inlet is communicated with the air cavity.

Further, the nozzle for spraying powder further includes: an air supplement pipe disposed outside the outer pipe, the air supplement pipe comprising: the main branch air supplementing pipe is communicated with one end of the first branch air supplementing pipe and one end of the second branch air supplementing pipe, the other end of the first branch air supplementing pipe is communicated with the first air inlet hole, and the other end of the second branch air supplementing pipe is communicated with the second air inlet hole.

Further: the gas channel is a channel inclined downwards.

Further: the inner diameter of the top end of the Laval nozzle is larger than that of the contraction pipe of the Laval nozzle.

In a second aspect, there is provided a spray coating device comprising: a first mounting board, a housing, a plurality of lasers and a nozzle as described in embodiments of the first aspect; the first mounting plate is provided with a mounting hole, the casing is arranged in the mounting hole in a penetrating mode, the casing is of a hollow structure, one end of the outer pipe is inserted into the hollow structure, the second air inlet hole is located above the casing and located in the hollow structure, a heat preservation layer is wrapped on the outer surface of the side wall of the outer pipe, a cooling water pipeline is wound on the outer surface of the heat preservation layer, one end of the cooling water pipeline is communicated with a cooling joint, the other end of the cooling water pipeline extends out of the casing, a resistance wire is wound on the outer surface of the cooling water pipeline, one end of the resistance wire is electrically connected with the heat preservation joint, and the laser device is uniformly mounted on the lower surface of the first mounting plate at intervals.

Further: the lower surface of the first mounting plate is connected with a plurality of U-shaped mounting seats, and each laser is rotatably mounted in the U-shaped mounting seat.

Further: the U-shaped mounting seat is mounted on the lower surface of the first mounting plate through an adjustable bolt.

Further: the one end of first mounting panel is connected with the one end of connecting plate, the second mounting panel is connected to the other end of connecting plate, the cooling joint with the heat preservation connects and installs on the second mounting panel.

Further: one end of the second mounting plate is connected with one end of the third mounting plate.

Thus, in the embodiment of the utility model, the gas supplementing channel and the powder supplementing channel are additionally arranged, so that the supply amount of powder at the position with low speed is increased, and uniform powder feeding is realized, thereby improving the deposition efficiency and the deposition quality of the coating and forming the coating with uniform thickness.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

FIG. 1 is a first cross-sectional view of a nozzle for spraying powder in accordance with an embodiment of the present invention;

FIG. 2 is a second cross-sectional view of a nozzle for use in powder coating in accordance with an embodiment of the present invention;

FIG. 3 is a perspective view of a nozzle for spraying powder in accordance with an embodiment of the present invention;

FIG. 4 is a bottom view of the outlet of the powder spray nozzle of an embodiment of the present invention;

FIG. 5 is a first schematic structural diagram of a spraying device according to an embodiment of the present invention;

FIG. 6 is a second schematic structural view of a spray coating device according to an embodiment of the present invention;

FIG. 7 is a cross-sectional view of a prior art Laval nozzle;

FIG. 8 is a bottom view of the outlet of a prior art Laval nozzle;

FIG. 9 is a schematic representation of a prior art Laval nozzle spray-formed coating;

FIG. 10 is a schematic illustration of a coating formed by spray coating of a nozzle for spraying a powder in accordance with an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The utility model discloses a spray pipe for spraying powder. As shown in FIGS. 1 to 4, the nozzle comprises the following structure: an outer tube 1 and a laval nozzle 2. Wherein the laval nozzle 2 is arranged inside the outer tube 1. The top end of the laval nozzle 2 is lower than the top end of the outer tube 1, i.e. the inlet of the laval nozzle 2 is lower than the inlet of the outer tube 1. The laval nozzle 2 is composed of two conical tubes, wherein the upper end is a contraction tube and the lower end is an expansion tube. Preferably, the internal diameter of the top end of the laval nozzle 2 is greater than the internal diameter of the convergent tube of the laval nozzle 2, so as to facilitate the powder entering the laval nozzle 2; the outlet at the bottom end of the laval nozzle 2 is circular, and the bottom end of the laval nozzle 2 is flush with the bottom end of the outer tube 1, namely the outlets of the laval nozzle and the outer tube are flush. The side wall of the laval nozzle 2 is provided with a plurality of powder supplementing channels 3 with uniform intervals, a plurality of air supplementing channels 4 with uniform intervals and an air cavity 5. Therefore, the laval nozzle 2 is located at the center, and the powder supplementing channel 3 and the gas supplementing channel 4 are both around the periphery of the laval nozzle 2. The powder supplementing channel 3 is positioned at the periphery of the air supplementing channel 4. The replenishing channels 3 and the replenishing channels 4 are arranged alternately, which is understood to mean on the circumference. Each powder supplementing channel 3 penetrates through the top end of the side wall of the laval nozzle 2 to the bottom end of the side wall of the laval nozzle 2, so that the inlet of the powder supplementing channel 3 is communicated with the inlet of the outer tube 1, and powder can enter the laval nozzle 2 and the powder supplementing channel 3 after entering the outer tube 1. The powder flow in the Laval nozzle 2 is big, and the powder in the powder supplementing channel 3 is mainly used for supplementing powder from all around, solves the uneven problem of powder blowout in the Laval nozzle 2. The top end of the air supply channel 4 is lower than the top end of the powder supplement channel 3. The side wall of the Laval nozzle 2 above the air supply channel 4 is provided with a circle of air chambers 5. The air chamber 5 is communicated with the top end of the air supply channel 4. It will be appreciated that the top end of the air chamber 5 is closed, i.e. does not communicate with the outer tube 1, so that, unlike the replenishing channel 3, the inlet of the replenishing channel 4 does not communicate with the inlet of the outer tube 1. Each of the gas supply passages 4 communicates with the inside of the laval nozzle 2 through a plurality of gas passages 6 arranged at regular intervals from the top to the bottom. Preferably, the gas channel 6 is a downwardly inclined channel. The bottom end of the air supply channel 4 is higher than the bottom end of the Laval nozzle 2, so that the air flow direction at the outlet is downward along the Laval nozzle 2, and the damage of the air flow to the powder flow direction at the outlet is avoided. Preferably, the diameter of the outer tube 1 near the bottom end is gradually reduced. The side wall of the outer tube 1 is provided with a first air inlet 7. The first air inlet 7 is located above the laval nozzle 2. The side wall of the outer pipe 1 and the side wall of the laval nozzle 2 are provided with a second air inlet hole which is communicated, and it should be understood that the second air inlet hole is not higher than the laval nozzle 2 and can be generally as high as the air cavity 5, and the communication only means that the side wall of the outer pipe 1 where the second air inlet hole is located is communicated with the side wall of the laval nozzle 2. The second inlet port communicates with the air chamber 5, so that the gas can be supplied to all the gas replenishing channels 4. The first air inlet hole 7 and the second air inlet hole are used for introducing high-pressure air to structures communicated with each other.

In addition, this spray tube still includes: and the air supplementing pipe is arranged outside the outer pipe 1. The air supplement pipe includes: a main branch air supply pipe 8, a first branch air supply pipe 9 and a second branch air supply pipe 10. One end of the main branch air supplement pipe 8 is communicated with one end of the first branch air supplement pipe 9 and one end of the second branch air supplement pipe 10 respectively. The other end of the first branch air supplementing pipe 9 is communicated with a first air inlet hole 7. The other end of the second branch air supplement pipe 10 is communicated with a second air inlet hole. The other end of the main path air supply pipe 8 can be communicated with a high-pressure air storage tank so as to lead high-pressure air into the spray pipe. The high-pressure gas is generally nitrogen.

In use, powder enters from the top end of the outer tube 1, then enters the laval nozzle 2 and is ejected from the outlet at the bottom end of the laval nozzle 2. Part of the powder enters the powder supplementing channel 3 and is sprayed out from the powder supplementing channel 3, and the powder is supplemented around the coating formed by spraying the Laval nozzle 2, so that the problem of uneven coating thickness is solved. In addition, during the spraying process, high-pressure gas enters the outer tube 1 through the first gas inlet 7 and enters the gas supplementing channel 4 through the second gas inlet. The high-pressure gas entering the outer tube 1 accelerates the powder in the outer tube 1 and the Laval nozzle 2, the high-pressure gas entering the gas supplementing channel 4 further accelerates the powder in the Laval nozzle 2, the supply amount of the powder at the position with low speed is increased, and uniform powder feeding is realized, so that the deposition efficiency of the coating is improved, and the coating with uniform thickness is formed.

The embodiment of the utility model also discloses a spraying device. As shown in fig. 1 to 6, the spray coating device includes: a first mounting board 11, a housing 12, a plurality of lasers 13 and a nozzle as described in the above embodiments. The nozzle structure will not be described in detail here.

The first mounting plate 11 is provided with mounting holes. The housing 12 is inserted into the mounting hole. The housing 12 is hollow. One end of the outer tube 1 is inserted into the hollow structure. The bottom end of the outer tube 1 is flush with the bottom end of the hollow structure. The second intake port is located above the housing 12. The outer surface of the side wall of the outer tube 1 located within the hollow structure is coated with an insulating layer 14. The outer surface of the insulating layer 14 is wound with a cooling water pipe 15. One end of the cooling water pipe 15 communicates with the cooling joint 16. The other end of the cooling water pipe 15 extends out of the housing 12 to be communicable with an external pipe for discharging the cooling water. The outer surface of the cooling water pipe 15 is wound with a resistance wire. One end of the resistance wire is electrically connected with the heat preservation joint 17. It will be appreciated that in order to achieve communication between the cooling water conduit 15 and the cooling connection 16 and the external conduits, and electrical connection of the resistance wires to the insulation connection 17, the housing 12 must be provided with corresponding outlets for the respective components to protrude. Specifically, one end of the first mounting plate 11 is connected to one end of the connecting plate 18, so that both are formed into an L-shape. The other end of the connecting plate 18 is connected with a second mounting plate 19, so that the two plates form an L shape or a T shape. The cooling connection 16 and the insulation connection 17 are mounted on a second mounting plate 19. Wherein the cooling joint 16 is connected with an external cooling device (such as a water tank), and the heat preservation joint 1 is connected with an external heat preservation device. The cooling water pipe 15 can be filled with liquid with a large specific heat capacity. Before the spraying with the spraying in-process, can start external heat preservation device, connect 17 heating resistor silk through the heat preservation, the heat that makes the resistance wire produce heats heat preservation 14, heat preservation 14 is even with the heat dispersion, makes spray tube thermally equivalent to preheat the spray tube before the spraying, and, at spraying in-process heating spray tube, thereby heat the powder in the spray tube, be favorable to the spraying effect. After the spraying is finished, the external cooling device is started, cooling water is introduced into the cooling water pipeline 15 through the cooling joint, and the spray pipe, the heat preservation layer 14 and other related components are cooled to normal temperature so as to protect the corresponding components.

A plurality of lasers 13 are mounted on the lower surface of the first mounting board 11 at regular intervals. For example, the number of lasers 13 is three. Preferably, a plurality of U-shaped mounting seats 20 are connected to the lower surface of the first mounting plate 11. Each laser 13 is rotatably mounted in a U-shaped mounting 20 to adjust the angle of the laser 13. Specifically, the housing of the laser 13 may be connected to two sidewalls of the U-shaped mounting base 20 through a rotating shaft. The shaft is rotatable to rotate the laser 13. The rotating shaft can be sleeved with a nut, and the rotating shaft is locked through the nut, so that the posture of the laser 13 is locked after the angle of the laser 13 is adjusted. Preferably, the U-shaped mounting base 20 is mounted on the lower surface of the first mounting plate 11 by an adjustable bolt 21, so that the height of the U-shaped mounting base 20 and thus the height of the laser 13 can be adjusted by changing the length of the adjustable bolt 21.

By providing the plurality of lasers 13, if the hardness of the powder or the base material is too high, the plurality of lasers 13 condense and irradiate the powder spot to soften the base and the powder, thereby improving the bonding strength between the powder spot and the base. In addition, before spraying, laser beams are emitted in advance, and the surface of a workpiece to be sprayed can be cleaned, roughened and preheated. The laser cleaning is used for eliminating the adverse effect of oil stain, an oxidation film and the like on the surface of the substrate on the deposition coating, the laser texturing is used for eliminating the influence of residues caused by sand blasting treatment, and the laser texturing plays a role in preheating the substrate while increasing the roughness so as to promote the combination of the coating and the substrate; the lateral laser spot is overlapped with the spraying powder spot, and the deposited powder and the matrix are synchronously heated and softened, so that the critical deposition speed of the powder is reduced, the deposition efficiency of the powder is improved, and the binding force of the coating is improved. After spraying, the laser beam is emitted to remelt the top area of the deposited coating, eliminate the internal pores of the coating, reduce the roughness of the surface of the coating, and keep the structure and the performance of the original powder at the middle lower part of the coating.

Further, one end of the third mounting plate 22 is connected to one end of the second mounting plate 19, so that the second mounting plate 19 and the third mounting plate 22 form an L-shape. The third mounting plate 22 may be provided with a general attachment hole so that the third mounting plate 22 is attached to an industrial robot commonly used for cold spraying through the attachment hole.

When in use, the power parameters, the powder feeding rate and the resistance wire temperature of the laser 13 are set. The high pressure gas storage cylinder is connected with a main path air supply pipe 8, and the type of carrier gas is nitrogen. The position of the laser 13 is adjusted so that the laser 13 is directed towards the location to be sprayed, so as to heat the sprayed powder and the location to be sprayed, achieving the aforementioned functions. And (3) turning on a carrier gas switch, enabling the powder to flow into the outer pipe 1 from the storage box and respectively enter the Laval nozzle 2 and the powder supplementing channel 3, and enabling the high-pressure gas to respectively enter the outer pipe 1 and the gas supplementing channel 4. And spraying the position to be sprayed to form a uniform coating. During the spraying process, the spraying device can be moved so that the spraying covers all the positions to be sprayed.

The spraying effect of the embodiment of the present invention is described below as a specific embodiment.

Example 1

The coatings were prepared using a prior art laval nozzle 23 as shown in fig. 7 and 8. Fixing the pretreated workpiece 24 on a workbench, drying the powder (drying at 120 ℃ for 1 hour) before spraying, then loading the powder into a powder feeder, setting cold spraying parameters on a control panel of cold spraying equipment, wherein the type of carrier gas is nitrogen, the pressure of the carrier gas is 4MPa, the preheating temperature of the carrier gas is 500 ℃, the powder feeding rate is 1.5rpm/min, the spraying distance is 30mm, the scanning speed of a nozzle is 10mm/s, and the laser power is 500W. A coating 25 having a non-uniform thickness is formed on the workpiece 24 as shown in fig. 7 and 9.

Example 2

The coating is prepared by adopting the spraying device provided by the embodiment of the utility model. Fixing the pretreated workpiece 24 on a workbench, drying the powder (drying at 120 ℃ for 1 hour) before spraying, then loading the powder into a powder feeder, setting cold spraying parameters on a control panel of cold spraying equipment, wherein the type of carrier gas is nitrogen, the pressure of the carrier gas is 4MPa, the preheating temperature of the carrier gas is 500 ℃, the powder feeding rate is 1.5rpm/min, the spraying distance is 30mm, the scanning speed of a nozzle is 10mm/s, and the laser power is 500W. A uniform coating 26, as shown in figures 1 and 10, is formed on the workpiece 24, with a 2mm facer thickness.

In summary, the embodiment of the utility model increases the supply amount of the powder at the position with low speed by additionally arranging the gas supplementing channel and the powder supplementing channel, so as to realize uniform powder feeding, thereby improving the deposition efficiency and the deposition quality of the coating and forming the coating with uniform thickness.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (9)

1. A nozzle for spraying powder, comprising: the powder replenishing device comprises an outer pipe and a Laval nozzle, wherein the Laval nozzle is arranged in the outer pipe, the top end of the Laval nozzle is lower than the top end of the outer pipe, the side wall of the Laval nozzle is provided with a plurality of uniformly spaced powder replenishing channels, a plurality of uniformly spaced gas replenishing channels and gas cavities, the powder replenishing channels are positioned at the periphery of the gas replenishing channels, the powder replenishing channels and the gas replenishing channels are arranged at intervals, each powder replenishing channel penetrates from the top end of the side wall of the Laval nozzle to the bottom end of the side wall of the Laval nozzle, the top end of the gas replenishing channel is lower than the top end of the powder replenishing channel, the bottom end of the gas replenishing channel is higher than the bottom end of the Laval nozzle, a circle of gas cavities are arranged in the side wall of the Laval nozzle above the gas replenishing channels, the gas cavities are communicated with the top ends of the gas replenishing channels, and each gas replenishing channel is communicated with the plurality of gas channels uniformly spaced from top to bottom inside of the Laval nozzle, the side wall of the outer pipe is provided with a first air inlet which is positioned above the Laval nozzle, the side wall of the outer pipe and the side wall of the Laval nozzle are provided with a second air inlet which is communicated, and the second air inlet is communicated with the air cavity.

2. The nozzle for spraying a powder of claim 1 further comprising: the setting is in the moisturizing pipe outside the outer pipe, the moisturizing pipe includes: the main branch air supplementing pipe is communicated with one end of the first branch air supplementing pipe and one end of the second branch air supplementing pipe, the other end of the first branch air supplementing pipe is communicated with the first air inlet hole, and the other end of the second branch air supplementing pipe is communicated with the second air inlet hole.

3. A lance in accordance with claim 1 for spraying powder wherein: the gas channel is a channel inclined downwards.

4. The lance defined in claim 1 wherein: the inner diameter of the top end of the Laval nozzle is larger than that of the contraction pipe of the Laval nozzle.

5. A spray coating device, comprising: a first mounting board, a housing, a plurality of lasers and a lance as claimed in any one of claims 1 to 4;

the first mounting plate is provided with a mounting hole, the casing is arranged in the mounting hole in a penetrating mode, the casing is of a hollow structure, one end of the outer pipe is inserted into the hollow structure, the second air inlet hole is located above the casing and located in the hollow structure, a heat preservation layer is wrapped on the outer surface of the side wall of the outer pipe, a cooling water pipeline is wound on the outer surface of the heat preservation layer, one end of the cooling water pipeline is communicated with a cooling joint, the other end of the cooling water pipeline extends out of the casing, a resistance wire is wound on the outer surface of the cooling water pipeline, one end of the resistance wire is electrically connected with the heat preservation joint, and the laser device is uniformly mounted on the lower surface of the first mounting plate at intervals.

6. The spray device of claim 5, wherein: the lower surface of the first mounting plate is connected with a plurality of U-shaped mounting seats, and each laser is rotatably mounted in the U-shaped mounting seat.

7. A spray assembly according to claim 6 wherein: the U-shaped mounting seat is mounted on the lower surface of the first mounting plate through an adjustable bolt.

8. A spray assembly according to claim 5 wherein: the one end of first mounting panel is connected with the one end of connecting plate, the second mounting panel is connected to the other end of connecting plate, the cooling joint with the heat preservation connects and installs on the second mounting panel.

9. The spray coating device of claim 8 wherein: one end of the second mounting plate is connected with one end of the third mounting plate.

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