Powder spraying device applied to steel pipe

Abstract

The invention discloses a powder spraying device applied to a steel pipe, and relates to the technical field of powder spraying, the powder spraying device comprises a support, a collecting mechanism, a conveying mechanism, a powder spraying mechanism and a powder spraying trolley, and the conveying mechanism comprises a plurality of rollers; the collecting mechanism comprises a first collecting cover, a pipeline and a collecting tank, the pipeline is connected to the first collecting cover and the collecting tank, and a heater is installed on the side of the first collecting cover; the powder spraying vehicle comprises a sliding vehicle body, a cantilever capable of extending into the steel pipe and a fixing frame, the cantilever is movably connected to the bottom of the fixing frame and is of a telescopic structure, the total length of the cantilever is larger than that of the steel pipe, a first hydraulic cylinder is installed in the cantilever, and the telescopic end of the first hydraulic cylinder is fixed to the end, extending into the pipeline, of the cantilever; the powder spraying mechanism comprises a first powder spraying gun set and a second powder spraying gun set, the first powder spraying gun set is installed on the side wall of the first collecting cover, and the second powder spraying gun set is installed at the end, stretching into the steel pipe, of the cantilever. The powder spraying device has the effect of improving the powder spraying work efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of powder spraying, and in particular to an epoxy powder spraying device applied to steel pipes. Background Art

[0002] During the storage of steel pipes, they will rust or corrode due to moisture and other reasons, which requires spraying powder on the steel pipes for corrosion protection. However, due to the limitations of spraying equipment and the different lengths of steel pipes, it is inconvenient to spray powder on longer steel pipes.

[0003] The existing spraying method is to divide the steel pipe into multiple short pipes for spraying respectively, and then weld and lengthen them, which greatly increases the construction time and has low work efficiency. Therefore, this application proposes a new technical solution. Summary of the invention

[0004] In order to improve the working efficiency of powder spraying, the present application provides a powder spraying device applied to steel pipes.

[0005] The present application provides a powder spraying device for steel pipes, which adopts the following technical solution:

[0006] A powder spraying device for steel pipes, comprising a bracket, a collecting mechanism, a conveying mechanism, a powder spraying mechanism and a powder spraying vehicle, wherein the bracket is located on the side of the conveying mechanism, the conveying mechanism is used to deliver the steel pipe horizontally and drive the steel pipe to rotate, one end of the conveying mechanism is a pipe inlet end, and the other end is a pipe outlet end;

[0007] The collection mechanism includes a first collection hood, a pipeline, a fan and a collection tank. The first collection hood is arranged around the delivery path of the steel pipe and is close to the outlet end of the pipe. The pipeline is mounted on a bracket and connects the first collection hood and the collection tank. The fan is installed on the pipeline. A heater is installed on the side of the first collection hood.

[0008] The powder spraying vehicle comprises a sliding vehicle body, a cantilever that can be inserted into a steel pipe, and a fixed frame. The sliding vehicle body is slidably connected to the bracket and the sliding direction is parallel to the conveying direction of the conveying mechanism. The fixed frame is slidably connected to the sliding vehicle body and the sliding direction is perpendicular to the sliding direction of the sliding vehicle body. The cantilever is movably connected to the bottom of the fixed frame, and the total length of the cantilever is greater than the length of the steel pipe.

[0009] The powder spraying mechanism comprises a first powder spraying gun group and a second powder spraying gun group. The first powder spraying gun group is installed on the side wall of the first collecting cover, and the second powder spraying gun group is installed on the end of the cantilever extending into the steel pipe.

[0010] Optionally, a second collecting cover is provided at the end of the cantilever extending into the steel pipe, the second collecting cover is hollow inside and has openings at both ends, the second powder spray gun group is installed on the outer wall of the second collecting cover, the second powder spray gun group includes a plurality of spray guns, the plurality of spray guns are distributed in a ring around the cantilever and are respectively facing the outside of the cantilever;

[0011] The first powder spray gun group includes a plurality of spray guns arranged in a rectangular shape, and each row of spray guns is staggered with the previous row of spray guns; the cantilever is a hollow structure and one end close to the second collecting cover is an open structure, and the cantilever is connected to the pipeline.

[0012] Optionally, the conveying mechanism comprises a plurality of rollers, the plurality of rollers are arranged in groups of two and each group is arranged horizontally, the arrangement direction of the two rollers in the same group is perpendicular to the arrangement direction of the rollers in each group, the rollers are arranged obliquely and the rotating surface forms an angle with the central axis of the steel pipe;

[0013] A slide rail for guiding the sliding vehicle body to slide is installed on the side of the roller, a screw slide is arranged on the side of the slide rail, the sliding vehicle body is fixed to the slider of the screw slide, and the pipeline is flexibly connected to the powder spraying vehicle.

[0014] Optionally, the pipeline includes a powder suction pipe, a cantilever pipe 1 and a cantilever pipe 2, one end of the powder suction pipe is connected to the first collection cover, and the other end is connected to the collection tank, and one end of the cantilever pipe 1 is connected to the powder suction pipe, and the other end extends toward the powder spraying vehicle;

[0015] The second cantilever pipe is connected to a position close to the end of the cantilever that does not extend into the steel pipe. The second cantilever pipe extends upward and is connected to the first cantilever pipe. One end of the second cantilever pipe close to the cantilever is a bellows structure.

[0016] Optionally, a control cabinet is further included, the first collecting cover is equipped with a laser sensor, the detection end of the laser sensor faces the center of the first collecting cover, the laser sensor detects and outputs the distance detection value, the control cabinet is electrically connected to the lead screw slide and the laser sensor, and the control cabinet is configured as follows:

[0017] If the distance detection value fed back by the laser sensor matches the distance detection value when the steel pipe enters the first collecting cover, a working instruction 1 is output to the screw slide;

[0018] If the distance detection value fed back by the laser sensor does not match the distance detection value when the steel pipe enters the first collecting cover, the second working instruction is output to the screw slide;

[0019] Among them, work instruction one is used to drive the slider of the screw slide to move toward the first collecting cover, and work instruction two is used to drive the slider of the screw slide to move in the direction away from the first collecting cover.

[0020] Optionally, it also includes a laser head protection mechanism, which includes an annular suction nozzle and an annular plate arranged around the center line of the probe of the laser sensor, the annular suction nozzle is located in front of the probe of the laser sensor and close to the front surface of the probe, the inner side of the annular suction nozzle is open and a side pipe is installed on the outer wall, and the side pipe is connected to the powder suction pipe; the annular plate surrounds the probe of the laser sensor and one end is fixed to the inner wall of the first collection cover, and the other end is fixed to the annular suction nozzle.

[0021] Optionally, a temperature sensor is installed outside the first collecting hood, the temperature sensor is a non-contact sensor and the probe faces the steel pipe, the temperature sensor, the transmission mechanism and the powder spraying mechanism are electrically connected to a control cabinet, and the control cabinet is configured as follows:

[0022] If the value fed back by the temperature sensor reaches the preset temperature threshold t1, the powder spraying mechanism and the conveying mechanism are operated; wherein t1 is a preset value;

[0023] If the value fed back by the temperature sensor does not reach the preset temperature threshold t1, the conveying mechanism and the powder spraying mechanism are stopped;

[0024] Record the relationship data between the heating rate m1 of the steel pipe and the speed V of the steel pipe driven by the conveying mechanism to generate a database;

[0025] The real-time heating rate m2 is calculated based on the temperature change of the steel pipe with the duration t2 as the sampling interval; wherein the duration t2 is a preset value;

[0026] Let m1=m2, search the database, obtain the matching speed V, and control the transmission mechanism according to the speed V.

[0027] Optionally, the diameter of the end of the cantilever pipe 2 is smaller than that of the cantilever pipe 1, and a rubber ring is provided at the end of the cantilever pipe 2 close to the end connected to the cantilever pipe 1, and the end of the cantilever pipe 1 abuts against the rubber ring.

[0028] Optionally, the cantilever is divided into multiple sections and plugged into each other, a mounting plate is fixed to the side wall of the end of the cantilever that does not extend into the steel pipe, a linear drive unit for driving the cantilever to extend and retract is installed on the mounting plate, and the telescopic end of the linear drive unit is fixed to the side wall of the last section of the cantilever.

[0029] Optionally, a counterweight box is provided at the end of the cantilever that does not extend into the steel pipe, and the top end of the counterweight box is open.

[0030] To summarize, the present application includes the following beneficial technical effects: the steel pipe is transferred by a conveying mechanism, the heater heats the steel pipe, and at the same time the powder spraying vehicle inserts the cantilever into the steel pipe. When the steel pipe is transferred to the first collecting cover, the first powder spraying mechanism starts working, and the second powder spraying mechanism in the steel pipe starts working at the same time. The roller continuously pushes the steel pipe to move until the steel pipe is powder-sprayed. No welding is required, and the steel pipe can be powder-sprayed inside and outside in an integrated manner, which saves working time and increases work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of this application;

[0032] Figure 2 It is a schematic diagram of the structure of the transmission mechanism in this application;

[0033] Figure 3 It is a schematic diagram of the structure of the powder spraying vehicle in this application;

[0034] Figure 4 is a schematic diagram of the internal structure of the cantilever in this application;

[0035] Figure 5 It is a schematic diagram of the structure of the collection mechanism in this application.

[0036] Explanation of the reference numerals: 1. bracket; 2. collecting mechanism; 3. conveying mechanism; 4. powder spraying mechanism; 5. powder spraying vehicle; 6. control cabinet; 7. steel pipe; 8. slide rail; 9. heater; 21. first collecting hood; 22. pipeline; 23. collecting tank; 24. second collecting hood; 221. powder suction pipe; 222. cantilever pipe one; 31. roller; 41. first powder spraying gun group; 51. sliding vehicle body; 52. fixing frame; 53. cantilever; 531. cantilever pipe two; 532. linear drive unit; 533. mounting plate; 54. counterweight box; 81. screw slide. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-5 This application is described in further detail.

[0038] The embodiment of the present application discloses a powder spraying device applied to a steel pipe.

[0039] Reference Figure 1 and Figure 2 The powder spraying device applied to steel pipes includes a bracket 1, a collecting mechanism 2, a conveying mechanism 3, and a powder spraying vehicle 5. The bracket 1 is located on the side of the conveying mechanism 3. The conveying mechanism 3 is used to deliver the steel pipe 7 horizontally and rotate the steel pipe 7. The length of the steel pipe 7 can be greater than 14 meters. One end of the conveying mechanism 3 is the pipe inlet end, and the other end is the pipe outlet end.

[0040] Reference Figure 1The collecting mechanism 2 includes a first collecting hood 21, a pipe 22, a collecting tank 23 and a fan (not shown in the figure). The first collecting hood 21 is arranged around the delivery path of the steel pipe 7 and is close to the outlet end of the pipe. The pipe 22 is mounted on the bracket 1 and connects the first collecting hood 21 and the collecting tank 23. The fan is installed in the pipe 22. The first collecting hood 21 is installed with a heater 9 on the side facing the powder spraying vehicle 5. The heater 9 can be an induction heater, for example: a medium frequency induction heater.

[0041] The pipeline 22 includes a powder suction pipe 221 and a cantilever pipe 222. One end of the powder suction pipe 221 is connected to the first collection cover 21, and the other end is connected to the collection tank 23. One end of the cantilever pipe 222 is connected to the powder suction pipe 221, and the other end of the cantilever pipe 222 extends toward the powder spraying vehicle 5. The fan is installed in the powder suction pipe 221. The fan can be an axial flow fan. The axial flow fan can suck the scattered powder into the pipeline 22, and then flow into the collection tank 23 through the pipeline 22. The collection tank 23 can be a cyclone separator, which can settle the powder in the air sucked into the pipeline 22 into the tank and then discharge the clean air.

[0042] Reference Figure 1 and Figure 2 The conveying mechanism 3 includes a plurality of rollers 31, which are arranged in groups of two and in each group in a horizontal direction. The arrangement direction of the two rollers 31 in the same group is perpendicular to the arrangement direction of the rollers 31 in each group. The rollers 31 are arranged in an inclined manner and the rotating surface forms an angle with the central axis of the steel pipe 7. The inclined arrangement can make the steel pipe 7 move while keeping rotating. A motor is installed on the wheel seat of one of the rollers 31 in each group. The roller 31 installed with the motor pushes the steel pipe 7 to move, and the other roller 31 can rotate with the movement of the steel pipe 7, thereby playing the role of conveying the steel pipe 7.

[0043] Reference Figure 1 and Figure 3 The powder spraying vehicle 5 includes a sliding body 51 and a fixed frame 52, wherein the sliding body 51 is a square frame structure, which can be assembled and formed by channel steel, etc. The sliding body 51 is slidingly connected to the slide rail and the slide groove pre-arranged on the bracket 1 through the corresponding slider. The fixed frame 52 is slidingly connected to the sliding body 51, and the sliding direction is perpendicular to the sliding direction of the powder spraying vehicle 5. The fixed frame 52 is located at the upper part of the sliding body 51 and extends downward. The bottom of the fixed frame 52 is hinged with a cantilever 53 through two rotating shafts. The inside of the cantilever 53 is hollow. A cantilever pipe 2 531 is installed on the cantilever 53. The end opening of the cantilever pipe 2 531 can be inserted into the end of the cantilever pipe 1 222. A rubber ring is adhered to the position near the end of the cantilever pipe 2 531. After the cantilever pipe 2 531 is inserted into the cantilever pipe 1 222, the end of the cantilever pipe 1 222 can be pressed against the rubber ring, thereby reducing air leakage.

[0044] One end of the cantilever pipe 531 close to the cantilever 53 has a bellows structure, which can be contracted or extended when the cantilever 53 swings up and down, so that the cantilever pipe 531 will not bend due to the up and down swinging of the cantilever 53.

[0045] In another embodiment, referring to Figure 1 and Figure 3 A slide rail 8 is installed on the side of the roller 31. The slide rail 8 is used to guide the sliding body 51 to slide. The bottom of the end of the sliding body 51 away from the bracket 1 is slidably connected to the slide rail 8. The side of the slide rail 8 away from the bracket 1 is installed with a screw slide 81. The side structure of the sliding body 51 is fixed to the slider of the screw slide 81 by bolts. The design of the slide rail 8 makes the sliding of the sliding body 51 more stable, and the screw slide 81 can make it slide without manual operation, which is more convenient to use.

[0046] Reference Figure 3 and Figure 4 The cantilever 53 is divided into multiple sections and plugged into each other. Take two sections as an example: the end of the first section is folded outward to form a limit plate, and the end of the second section close to the first section is folded inward to form a limit plate, thereby limiting the position, wherein the size of the second section is larger than the first section. The cantilever 53 is hollow, and a mounting plate 533 is fixed to the side wall of the end of the cantilever 53 that does not extend into the steel pipe 7. A linear drive unit 532 for driving the cantilever 53 to extend and retract is installed on the mounting plate 533. The linear drive unit 532 can be a hydraulic cylinder. The cantilever 53 is a telescopic structure, so it can adapt to steel pipes 7 of different sizes and can be conveniently stored by the powder spraying vehicle 5 when not in use. A mounting plate 533 is fixed to the side wall of the cantilever 53, and the hydraulic cylinder 532 is installed on the mounting plate 533. A counterweight box 54 is welded to the end of the cantilever 53 close to the powder spraying vehicle 5. The top of the counterweight box 54 is open, which is convenient for placing counterweights of different weights according to the extended length of the cantilever 53.

[0047] Reference Figure 1 and Figure 5 The powder spraying device applied to the steel pipe also includes a powder spraying mechanism 4, and the powder spraying mechanism 4 includes a first powder spraying gun group 41 and a second powder spraying gun group.

[0048] In this embodiment, the first collecting cover 21 includes two annular structures with the same central axis, and the two annular structures are close to each other.

[0049] The first powder spray gun group 41 is installed on the inner side wall of the annular structure of the first collecting cover 21 relatively close to the inlet end. The first powder spray gun group 41 includes multiple spray guns arranged in a rectangular shape. Each row of spray guns is staggered with the next row of spray guns to make powder spraying more uniform.

[0050] A second collecting hood 24 is installed at the end of the cantilever 53, and the second collecting hood 24 extends into the first collecting hood 21 under the action of the cantilever 53; the second collecting hood 24 is hollow inside and has openings at the top and bottom. This arrangement facilitates the suction of powder scattered by the second powder spraying gun group into the second collecting hood 24, so that it can flow out from the pipe 22. The second powder spraying gun group is installed on the outer wall of the second collecting hood 24. The second powder spraying gun group includes a plurality of spray guns, and the spray guns are distributed in a ring shape around the cantilever 53 and are respectively facing the outside of the cantilever 53.

[0051] In another embodiment, a laser sensor is installed in the annular structure relatively close to the inlet end of the first collecting cover 21, and the detection end of the laser sensor faces the center of the first collecting cover 21. The laser sensor detects and outputs the distance detection value. The laser sensor is electrically connected to the control cabinet 6, and the control cabinet 6 is also electrically connected to the screw slide 81. The controller is configured as follows:

[0052] If the distance detection value fed back by the laser sensor matches the distance detection value when the steel pipe 7 enters the first collecting cover 21, a working instruction 1 is output to the screw slide 8;

[0053] If the distance detection value fed back by the laser sensor does not match the distance detection value when the steel pipe 7 enters the first collecting cover 21, a second working instruction is output to the screw slide 8;

[0054] Among them, working instruction one is used to drive the slider of the screw slide 8 to move toward the first collecting cover 21, and working instruction two is used to drive the slider of the screw slide 8 to move in a direction away from the first collecting cover 21.

[0055] It can be understood that the above premise is that the roller 31 is continuously rotating to deliver the steel pipe 7 to the first collecting cover 21; that is, after the steel pipe 7 is delivered to the first collecting cover 21, the cantilever 53 is automatically inserted into the steel pipe 7 by using the screw slide 8; it should be noted that the screw slide 8 stops at a preset amount of movement to ensure that the second collecting cover 24 is in the first collecting cover 21, so as to facilitate the powder spraying operation and dust collection.

[0056] The side wall of the first collecting hood 21 is also equipped with a laser head protection mechanism (not shown in the figure). The laser head protection mechanism includes an annular suction nozzle and an annular plate arranged around the center line of the probe of the laser sensor, wherein the annular suction nozzle is located in front of the probe of the laser sensor and close to the front surface of the probe. This arrangement can better protect the laser sensor. The inner side of the annular suction nozzle is opened, which can absorb most of the powder flying toward the laser sensor, thereby reducing the powder sprayed by the powder spraying mechanism 4 from falling on the laser sensor.

[0057] A side pipe is installed on the outer wall of the annular suction nozzle, and the side pipe is connected to the powder suction pipe 221, so that the powder sucked by the annular suction nozzle can be transported to the powder suction pipe 221, and finally flows into the collection tank 23. The ring plate surrounds the probe of the laser sensor and is fixed to the inner wall of the first collection cover 21 at one end and fixed to the annular suction nozzle at the other end. This arrangement can not only fix the suction nozzle, but also reduce the powder from being sucked from the side close to the inner wall to the front of the laser sensor.

[0058] In another embodiment, referring to Figure 5 A temperature sensor is also installed outside the first collecting hood 21. The temperature sensor can be installed on the ground between the heater 9 and the first collecting hood 21, or on the housing of the heater 9. The temperature sensor is a non-contact sensor, for example, an infrared temperature detector with the probe facing the heating part of the steel pipe 7. The control cabinet 6 is electrically connected to the temperature sensor, the powder spraying mechanism 4 and the conveying mechanism 3. The configuration of the control cabinet 6 is as follows:

[0059] If the value fed back by the temperature sensor reaches the preset temperature threshold t1, the powder spraying mechanism 4 and the conveying mechanism 3 are operated; wherein t1 is a preset value, which refers to a temperature suitable for powder spraying;

[0060] If the value fed back by the temperature sensor does not reach the preset temperature threshold t1, the powder spraying mechanism 4 and the conveying mechanism 3 are stopped;

[0061] Record the relationship data between the heating rate m1 of the steel pipe 7 and the speed V at which the conveying mechanism 3 drives the steel pipe 7 to move, and generate a database;

[0062] The real-time heating rate m2 is calculated based on the temperature change of the steel pipe 7 with the duration t2 as the sampling interval; wherein the duration t2 is a preset value;

[0063] Let m1=m2, search the database, obtain the matching speed V, and control the transmission mechanism 3 according to the speed V.

[0064] The value of t1 is determined by the material of the powder. When spraying the powder, a certain temperature index must be met in order for the sprayed powder to solidify. Therefore, the steel pipe 7 needs to be heated. If the value detected by the temperature sensor does not meet the standard, the conveying mechanism 3 stops conveying the steel pipe 7, and the steel pipe 7 is placed in the middle of the heater 9 and continues to be heated until it meets the standard and then starts working again. The speed at which the steel pipe 7 is driven includes the horizontal movement and rotation of the steel pipe 7, that is, the speed V actually includes the horizontal movement speed and the rotation speed of the steel pipe 7. The heating rate of the steel pipe 7 and the speed at which the conveying mechanism 3 drives the steel pipe 7 are recorded and a database is built to facilitate matching the corresponding conveying speed of the steel pipe 7 according to the heating rate of the steel pipe 7, so that the powder sprayed by the powder spraying mechanism 4 can be more uniform.

[0065] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A powder spraying device for steel pipes, characterized in that: The invention comprises a support (1), a collecting mechanism (2), a conveying mechanism (3), a powder spraying mechanism (4) and a powder spraying vehicle (5), wherein the support (1) is located on the side of the conveying mechanism (3), the conveying mechanism (3) is used for delivering the steel pipe (7) transversely and driving the steel pipe (7) to rotate, and one end of the conveying mechanism (3) is a pipe inlet end and the other end is a pipe outlet end; The collecting mechanism (2) comprises a first collecting hood (21), a pipe (22), a fan and a collecting tank (23); the first collecting hood (21) is arranged around the delivery path of the steel pipe (7) and close to the pipe outlet; the pipe (22) is mounted on the bracket (1) and connects the first collecting hood (21) and the collecting tank (23); the fan is installed on the pipe (22); a heater (9) is installed on the side of the first collecting hood (21); The powder spraying vehicle (5) comprises a sliding vehicle body (51), a cantilever (53) which can be inserted into the steel pipe (7), and a fixed frame (52); the sliding vehicle body (51) is slidably connected to the bracket (1) and the sliding direction is parallel to the conveying direction of the conveying mechanism (3); the fixed frame (52) is slidably connected to the sliding vehicle body (51) and the sliding direction is perpendicular to the sliding direction of the sliding vehicle body (51); the cantilever (53) is movably connected to the bottom of the fixed frame (52); and the total length of the cantilever (53) is greater than the length of the steel pipe (7); The powder spraying mechanism (4) comprises a first powder spraying gun group (41) and a second powder spraying gun group, wherein the first powder spraying gun group (41) is installed on the side wall of the first collecting cover (21), and the second powder spraying gun group is installed on the end of the cantilever (53) extending into the steel pipe (7).

2. The powder spraying device for steel pipe according to claim 1, characterized in that: The end of the cantilever (53) extending into the steel pipe (7) is provided with a second collecting cover (24), the second collecting cover (24) is hollow inside and has openings at both ends, the second powder spray gun group is installed on the outer wall of the second collecting cover (24), the second powder spray gun group includes a plurality of spray guns, the plurality of spray guns are distributed in a ring shape around the cantilever and are respectively facing the outside of the cantilever; The first powder spray gun group (41) includes a plurality of spray guns arranged in a rectangular shape, and each row of spray guns is staggered with the spray guns in the previous row; the cantilever (53) is a hollow structure and one end close to the second collecting hood (24) is an open structure, and the cantilever (53) is connected to the pipeline (22).

3. The powder spraying device for steel pipe according to claim 1, characterized in that: The conveying mechanism (3) comprises a plurality of rollers (31), the plurality of rollers (31) are arranged in groups of two and each group is arranged horizontally, the arrangement direction of the two rollers (31) in the same group is perpendicular to the arrangement direction of the rollers (31) in each group, the rollers (31) are arranged in an inclined manner and the rotation surface forms an angle with the central axis of the steel pipe (7); A slide rail (8) for guiding the sliding of the sliding vehicle body (51) is installed on the side of the roller (31), a screw slide (81) is provided on the side of the slide rail (8), the sliding vehicle body (51) is fixed to the slider of the screw slide (81), and the pipeline (22) is flexibly connected to the powder spraying vehicle (5).

4. The powder spraying device for steel pipes according to claim 3, characterized in that: The pipeline (22) comprises a powder suction pipe (221), a cantilever pipe 1 (222) and a cantilever pipe 2 (531); one end of the powder suction pipe (221) is connected to the first collection cover (21), and the other end is connected to the collection tank (23); one end of the cantilever pipe 1 (222) is connected to the powder suction pipe (221), and the other end extends toward the powder spraying vehicle (5); The second cantilever pipe (531) is connected to a position close to the end of the cantilever (53) that does not extend into the steel pipe (7), the second cantilever pipe (531) extends upward and is connected to the first cantilever pipe (222), and the end of the second cantilever pipe (531) close to the cantilever (53) is a bellows structure.

5. The powder spraying device for steel pipe according to claim 4, characterized in that: The device further comprises a control cabinet (6), wherein the first collecting cover (21) is provided with a laser sensor, wherein the detection end of the laser sensor faces the center of the first collecting cover (21), and the laser sensor detects and outputs a distance detection value. The control cabinet (6) is electrically connected to the screw slide (81) and the laser sensor, and the control cabinet (6) is configured as follows: If the distance detection value fed back by the laser sensor matches the distance detection value when the steel pipe (7) enters the first collecting cover (21), a working instruction 1 is output to the screw slide (81); If the distance detection value fed back by the laser sensor does not match the distance detection value when the steel pipe (7) enters the first collecting cover (21), a second working instruction is output to the screw slide (81); The first working instruction is used to drive the slider of the screw slide (81) to move toward the first collecting cover (21), and the second working instruction is used to drive the slider of the screw slide (81) to move in a direction away from the first collecting cover (21).

6. The powder spraying device for steel pipe according to claim 5, characterized in that: It also includes a laser head protection mechanism, which includes an annular suction nozzle and an annular plate arranged around the center line of the laser sensor probe, the annular suction nozzle is located in front of the laser sensor probe and close to the front surface of the probe, the inner side of the annular suction nozzle is open and a side pipe is installed on the outer wall, the side pipe is connected to the powder suction pipe (221); the annular plate surrounds the laser sensor probe and one end is fixed to the inner wall of the first collection cover (21), and the other end is fixed to the annular suction nozzle.

7. The powder spraying device for steel pipe according to claim 4, characterized in that: A temperature sensor is installed outside the first collecting hood (21), the temperature sensor is a non-contact sensor and the probe is facing the steel pipe (7), the temperature sensor, the conveying mechanism (3) and the powder spraying mechanism (4) are electrically connected to a control cabinet (6), and the control cabinet (6) is configured as follows: If the value fed back by the temperature sensor reaches a preset temperature threshold value t1, the powder spraying mechanism (4) and the conveying mechanism (3) are operated; wherein t1 is a preset value; If the value fed back by the temperature sensor does not reach the preset temperature threshold t1, the conveying mechanism (3) and the powder spraying mechanism (4) are stopped; Record the relationship data between the heating rate m1 of the steel pipe (7) and the speed V at which the conveying mechanism (3) drives the steel pipe (7) to move, and generate a database; Taking the time t2 as the sampling interval, the real-time heating rate m2 is calculated based on the temperature change of the steel pipe (7); wherein the time t2 is a preset value; Let m1=m2, search the database, obtain the matching speed V, and control the transmission mechanism according to the speed V (3).

8. The powder spraying device for steel pipe according to claim 3, characterized in that: The diameter of the end of the cantilever pipe 2 (531) is smaller than that of the cantilever pipe 1 (222). A rubber ring is provided near the end of the cantilever pipe 2 (531) connected to the cantilever pipe 1 (222), and the end of the cantilever pipe 1 (222) abuts against the rubber ring.

9. The powder spraying device for steel pipe according to claim 1, characterized in that: The cantilever (53) is divided into multiple sections and plugged into each other. A mounting plate (533) is fixed to the side wall of one end of the cantilever (53) that does not extend into the steel pipe (7). A linear drive unit (532) for driving the cantilever (53) to extend and retract is mounted on the mounting plate (533). The telescopic end of the linear drive unit (532) is fixed to the side wall of the last section of the cantilever (53).

10. The powder spraying device for steel pipe according to claim 9, characterized in that: The end of the cantilever (53) that does not extend into the steel pipe (7) is provided with a counterweight box (54), and the top end of the counterweight box (54) is open.

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