A pipe powder spraying uniform device for controlling powder spraying amount by partition control and application method

Abstract

The application provides a bend pipe powder internal spraying uniform device for controlling powder spraying amount in different zones and an application method, and the bend pipe powder internal spraying uniform device for controlling powder spraying amount in different zones comprises a walking mechanism and a rotary spraying mechanism, wherein the rotary spraying mechanism comprises a plurality of powder spraying guns and a rotary servo motor, the plurality of powder spraying guns are uniformly arranged on a cross section of a head position of the walking mechanism, the plurality of powder spraying guns are divided into different powder spraying gun groups according to corresponding inside and outside positions of the bend pipe and pipe internal heights, different powder spraying gun groups correspond to different pipe internal areas, powder spraying gun groups of different areas perform different powder spraying amounts, and the rotary servo motor drives the head to rotate. The application solves the problem of how to eliminate the inside and outside coating thickness deviation in the pipe internal spraying process of the bend pipe, which leads to unqualified coating thickness.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of inner spraying of elbow pipes, in particular to an elbow pipe inner spraying uniformity adjusting device for controlling powder spraying amount in different zones and an application method. BACKGROUND

[0002] Elbow pipes are important components of conveying pipelines. Elbow pipes are generally made of steel, and elbow pipe spraying can effectively solve the problem of corrosion of the pipe body by the conveying medium. Elbow pipe inner spraying includes phenolic primer spraying and fusion-bonded epoxy powder spraying. Common large-diameter elbow pipe fittings are composed of straight pipe sections and elbow pipe sections, i.e., the two ends of the elbow pipe fitting are straight pipe sections, and the middle part is an elbow pipe section.

[0003] In order to realize mechanized construction of elbow pipe inner spraying, technicians designed a "serpentine joint + vertical support rod + horizontal limiting rod" device, and the ends of the vertical support rod and the horizontal limiting rod are provided with rollers. The device can ensure that the spraying device freely passes through and is centered in the elbow pipe, thereby significantly improving the efficiency of elbow pipe inner spraying.

[0004] The "serpentine joint + vertical support rod + horizontal limiting rod" device has the following problems: since the spray head is located at the center line of the pipe, the vertical bisector of the end face circle of the spray head coincides with the vertical bisector of the cross-sectional circle of the corresponding elbow pipe. When the spraying device works at a uniform speed (the spray head rotates at a uniform speed, and the device walks at a uniform speed), the powder receiving amount on the inner and outer sides of the elbow pipe section is the same. The central angle and the arc length passed through per unit time are the same, while the inner surface area of the outer side of the elbow pipe corresponding to the same central angle and the inner surface area of the inner side are different. However, the powder amount sprayed by the spray head to the inner and outer sides of the elbow pipe is the same during uniform rotation. As a result, although the spraying device walks at a uniform speed and the spray head rotates at a uniform speed, the coating thicknesses of the inner and outer sides of the elbow pipe are different. The difference becomes more and more obvious as the diameter of the elbow pipe increases. The difference in coating thickness between the inner and outer sides of the elbow pipe leads to the following problems in terms of quality: when the coating thickness of the inner side of the elbow pipe is moderate, the coating thickness of the outer side is insufficient; when the coating thickness of the outer side of the elbow pipe is moderate, the coating thickness of the inner side exceeds the standard. Insufficient coating thickness is unqualified, and excessive coating thickness often causes problems such as powder falling off and incomplete fusion. SUMMARY

[0005] The present application aims to provide an elbow pipe inner spraying uniformity adjusting device for controlling powder spraying amount in different zones and an application method, which mainly solves the problem of how to eliminate the deviation of the coating thickness between the inner and outer sides of the elbow pipe during inner spraying, which leads to unqualified coating thickness.

[0006] In order to achieve the above object, the technical scheme adopted by the present application is: a partitioned control powder spraying amount elbow pipe internal powder spraying uniformity device, characterized in that: the partitioned control powder spraying amount elbow pipe internal powder spraying uniformity device comprises a walking mechanism and a rotary spraying mechanism, wherein the rotary spraying mechanism comprises a plurality of powder spraying guns and a rotary servo motor, the plurality of powder spraying guns are uniformly arranged on the cross section of the head position of the walking mechanism, the plurality of powder spraying guns are divided into different powder spraying gun groups according to the corresponding inside and outside positions of the elbow pipe and the height in the pipe, different powder spraying gun groups correspond to different pipe regions, and different powder spraying gun groups in different regions perform different powder spraying amounts, and the rotary servo motor drives the head to rotate.

[0007] Further, the walking mechanism further comprises a walking servo motor and a walking trolley, the walking trolley is controlled by the walking servo motor and drives the head to move;

[0008] The partitioned control powder spraying amount elbow pipe internal powder spraying uniformity device further comprises a powder supply mechanism and a control mechanism, the powder supply mechanism comprises a powder conveying pipeline, a digital proportional valve and a powder source, each powder spraying gun is provided with an independent powder conveying pipeline connected to the powder source, and a digital proportional valve is arranged on each powder conveying pipeline;

[0009] The control mechanism controls the operation of the rotary servo motor, the walking servo motor and the digital proportional valve.

[0010] Further, the control mechanism comprises a PLC, the PLC controls the operation of the rotary servo motor and the walking servo motor, and the PLC controls the opening degree of the digital proportional valve and further controls the powder spraying amount of each powder spraying gun per unit time.

[0011] An application method of a partitioned control powder spraying amount elbow pipe internal powder spraying uniformity device, characterized in that: the above-mentioned partitioned control powder spraying amount elbow pipe internal powder spraying uniformity device is used in the process of spraying in the elbow pipe, different powder spraying gun groups corresponding to different partitions are set to realize the uniform internal spraying of the straight pipe section and the elbow section of the elbow pipe; and / or in the process of spraying in the elbow pipe, different powder spraying gun groups corresponding to different partitions are set to realize the uniform spraying of the inside and the outside of the elbow section.

[0012] Further, the movement form of the powder spraying gun group of the powder spraying mechanism is rotary movement, so that different powder spraying gun groups corresponding to different partitions can implement different powder spraying amounts.

[0013] Further, the cross section of the elbow pipe fitting is divided into four parts: A area, B area, C area and D area, with the upper part of the vertical diameter of the circular cross section of the elbow pipe fitting as the 0-degree line, the sector corresponding to the A area being 135°-225° in the clockwise direction, the A area corresponding to the lower surface inside the elbow pipe fitting, the sector corresponding to the B area being 225°-315° in the clockwise direction, the B area corresponding to the inner side of the elbow pipe fitting, the sector corresponding to the C area being 315°-45° in the clockwise direction, the C area corresponding to the upper surface inside the elbow pipe fitting, and the sector corresponding to the D area being 45°-135° in the clockwise direction, the D area corresponding to the outer side of the elbow pipe fitting;

[0014] According to the division of the A area, the B area, the C area and the D area, the plurality of powder spraying guns are divided into an A area powder spraying gun group, a B area powder spraying gun group, a C area powder spraying gun group and a D area powder spraying gun group;

[0015] When the straight pipe section of the elbow pipe fitting is sprayed, the powder spraying amount of the A area powder spraying gun group is < the powder spraying amount of the B and D area powder spraying gun groups < the powder spraying amount of the C area powder spraying gun group;

[0016] When the elbow pipe section of the elbow pipe fitting is sprayed, the powder spraying amount of the A area powder spraying gun group is ≤ the powder spraying amount of the B area powder spraying gun group < the powder spraying amount of the C area powder spraying gun group < the powder spraying amount of the D area powder spraying gun group.

[0017] Further, 4n powder spraying guns are evenly arranged on the cross section of the nose position of the walking mechanism, each powder spraying gun is connected with a digital proportional valve through a powder conveying pipeline, the 1st to nth digital proportional valves correspond to the 1st to nth powder spraying guns of the A area powder spraying gun group, the n+1st to 2nth digital proportional valves correspond to the n+1st to 2nth powder spraying guns of the B area powder spraying gun group, the 2n+1st to 3nth digital proportional valves correspond to the 2n+1st to 3nth powder spraying guns of the C area powder spraying gun group, and the 3n+1st to 4nth digital proportional valves correspond to the 3n+1st to 4nth powder spraying guns of the D area powder spraying gun group;

[0018] The PLC includes a main controller PLC0 and PLC1, PLC2, PLC3 and PLC4, and the main controller PLC0 controls the operation of the walking servo motor, the swing servo motor, PLC1, PLC2, PLC3 and PLC4;

[0019] PLC1 controls the opening degree of the 1st to nth digital proportional valves;

[0020] PLC2 controls the opening degree of the n+1st to 2nth digital proportional valves;

[0021] PLC3 controls the opening degree of the 2n+1st to 3nth digital proportional valves;

[0022] PLC4 controls the opening degree of the 3n+1st to 4nth digital proportional valves;

[0023] Further, the swing amplitude of the A area spray gun group, the B area spray gun group, the C area spray gun group and the D area spray gun group is not greater than ±45°.

[0024] Further, the application method of the elbow pipe powder spraying uniform device for partition control of powder spraying amount is as follows:

[0025] S1, according to the diameter of the elbow pipe, the length of the straight pipe section and the length of the elbow pipe section, the running parameters of the walking servo motor are set;

[0026] S2, according to the diameter of the elbow pipe, the coating thickness requirement and the specification and combination of the spray gun, the powder amount parameters of the A, B, C and D area spray gun groups are set;

[0027] S3, the coated elbow pipe is in place, the walking mechanism travels to the farthest end of the elbow pipe, the control mechanism controls the powder supply mechanism to start working, the spray servo motor works, the spray gun group starts to swing, the walking servo motor works, and the walking trolley drives the spray mechanism to walk at a constant speed from the far end of the elbow pipe to the near end of the elbow pipe, while the spray coating process is performed;

[0028] S4, the elbow pipe internal spraying is completed, and the device stops working, waiting for the next operation.

[0029] Further, in step S1, the length L1 of the straight pipe section 1, the working walking time t1 of the straight pipe section 1, the length L2 of the elbow pipe section, the walking time t2 of the elbow pipe section, the length L3 of the straight pipe section 2 and the working walking time t3 of the straight pipe section 2 are set.

[0030] In step S2, the powder amount parameters and the corresponding digital proportional valve opening degree of the straight pipe section are set first, that is, the powder amount powder output speed value V1A and the corresponding digital proportional valve opening degree value W1A of the A area spray gun group of the straight pipe section, the powder amount powder output speed value V1B and the corresponding digital proportional valve opening degree value W1B of the B area spray gun group, the powder amount powder output speed value V1C and the corresponding digital proportional valve opening degree value W1C of the C area spray gun group, and the powder amount powder output speed value V1D and the corresponding digital proportional valve opening degree value W1D of the D area spray gun group, V1B=V1D, W1B=W1D, V1A V1B=V1D, W1A

[0031] In step S3, the walking mechanism enters the elbow pipe from the proximal end of the elbow pipe fitting, travels to the distal end of the elbow pipe fitting, and after positioning, the walking servo motor sends a positioning signal to the main controller PLC0, the main controller PLC0 receives the signal, sends the rotation and swing parameters of the powder spraying gun group to the powder spraying servo motor, and simultaneously sends the powder amount, powder output speed values and digital proportional valve opening values of the straight pipe sections of the A, B, C and D area powder spraying gun groups to the corresponding digital proportional valves F1~F4n through PLC1, PLC2, PLC3 and PLC4 respectively, the powder spraying gun group starts to rotate and swing according to the set rotation and swing parameters, each digital proportional valve is opened according to the set parameters, W1B=W1D, W1A<W1B=W1D<W1C, the powder supply pipeline supplies powder to the powder spraying gun group, to ensure that V1A<V1B=V1D<V1C, the straight pipe section powder spraying operation is performed, and at the same time the walking servo motor drives the powder spraying mechanism to uniformly walk from the distal end of the elbow pipe to the proximal end of the elbow pipe; after a time t1, the powder spraying mechanism walks to the connection between the straight pipe section 1 and the elbow pipe section, the main controller PLC0 sends the powder amount, powder output speed values and digital proportional valve opening values of the elbow pipe sections of the A, B, C and D area powder spraying gun groups to the corresponding digital proportional valves F1~F4n through PLC1, PLC2, PLC3 and PLC4 respectively, and performs the preset elbow pipe section powder spraying process, at this time W2A≤W2B<W2C<W2D, V2A≤V2B<V2C<V2D; after another time t2, the powder spraying mechanism walks to the connection between the elbow pipe section and the straight pipe section 2, the main controller PLC0 sends the powder amount, powder output speed values and digital proportional valve opening values of the straight pipe sections of the A, B, C and D area powder spraying gun groups to the corresponding digital proportional valves through PLC1, PLC2, PLC3 and PLC4 respectively, and performs the straight pipe section 2 powder spraying operation, at this time W1A<W1B=W1D<W1C, V1A<V1B=V1D<V1C; finally after a time t3, the powder spraying mechanism walks through all the straight pipe and elbow pipe sections and reaches the proximal end surface position of the elbow pipe fitting, the main controller PLC0 sends a stop command to the walking servo motor and simultaneously sends a stop command to the powder spraying servo motor, and sends a closing command to each digital proportional valve through PLC1, PLC2, PLC3 and PLC4 respectively.

[0032] In view of the above technical features, the application has the following advantages:

[0033] The application discloses a partition control powder spraying amount elbow powder inner spraying uniform device and an application method. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a structure schematic view of the partition control powder spraying amount elbow powder inner spraying uniform device in embodiment 1;

[0035] Figure 2 is a division diagram of the elbow pipe in embodiment 1, which is divided into A zone, B zone, C zone and D zone in a cross section;

[0036] Figure 3 is a powder spraying mechanism and powder spraying gun layout schematic view in embodiment 1 (8 powder spraying guns)

[0037] Figure 4 is a control relationship diagram in embodiment 1.

[0038] In the figure: 100, elbow pipe; 201, powder spraying gun; 202, rotary servo motor; 203, powder conveying pipe bundle; 204, powder conveying pipeline; 301, machine head; 302, walking trolley; 303, walking servo motor; 401, digital proportional valve; 501, powder blowing device; 502, fluidization box. DETAILED DESCRIPTION

[0039] The application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the application and not used to limit the scope of the application. In addition, it should be understood that after reading the content of the application, those skilled in the art can make various modifications or changes to the application, and these equivalent forms also fall within the scope of the appended claims of the application.

[0040] Reference Figures 1 to 4, specifically, embodiment 1, a kind of powder spraying uniformity device of bend pipe powder internal spraying of partition control powder spraying amount includes walking mechanism, rotary spraying mechanism, wherein rotary spraying mechanism includes multiple powder spraying gun 201 and rotary servo motor 202, multiple powder spraying gun 201 is evenly arranged in the position cross section of the nose 301 of walking mechanism, multiple powder spraying gun 201 is divided into different powder spraying gun groups according to corresponding bend pipe inside and outside position, pipe height in pipe, different powder spraying gun groups correspond to different pipe area, and different area powder spraying gun group executes different powder spraying amount, rotary servo motor 202 drives nose 301 rotary, so that different powder spraying gun group always works in the area corresponding to bend pipe pipe fitting 100.In addition, walking mechanism also includes walking servo motor 303 and walking trolley 302, walking trolley 302 is controlled by walking servo motor 303, and drives nose 301 to move;

[0041] The powder spraying amount of the powder spraying uniformity device of bend pipe powder internal spraying of partition control further includes powder supply mechanism and control mechanism, the powder supply mechanism includes powder conveying pipeline 204, digital proportional valve 401 and powder source (not shown in the drawings), each powder spraying gun 201 is configured with independent powder conveying pipeline 204 to communicate with the powder source, the powder conveying pipeline 204 is connected with powder blowing device 501 and fluidized box 502, the fluidized box 502 makes the powder of the powder source flow like water under the action of peristaltic pump, and the digital proportional valve 401 is arranged on each powder conveying pipeline 204;The control mechanism controls the operation of rotary servo motor 202, walking servo motor 303 and digital proportional valve 401.A plurality of powder conveying pipelines 204 are gathered into a powder conveying bundle 203.

[0042] The control mechanism includes PLC, and the PLC controls the operation of rotary servo motor 202 and walking servo motor 303;The PLC controls the opening of digital proportional valve 401, and further controls the powder spraying amount of each powder spraying gun 201 per unit time.The PLC is in communication connection with the walking servo motor 303.

[0043] A kind of powder spraying amount of the powder spraying uniformity device of bend pipe powder internal spraying of partition control application method, utilizes above-mentioned one kind of powder spraying amount of the powder spraying uniformity device of bend pipe powder internal spraying of partition control, in the process of spraying in bend pipe pipe fitting 100, realizes the uniform internal spraying of straight pipe section, bend pipe section of bend pipe pipe fitting 100 by the difference setting of the powder spraying amount of different partition corresponding powder spraying gun group;And / or in the process of spraying in bend pipe pipe fitting 100, realizes the uniform spraying of inside and outside in bend pipe section by the difference setting of the powder spraying amount of different partition corresponding powder spraying gun group.

[0044] Preferably, the movement form of the powder spraying gun group of the powder spraying mechanism is rotary movement, so that different powder spraying gun groups implement different powder spraying amount.The powder spraying mechanism realizes comprehensive and uniform spraying coverage to the inner wall of bend pipe pipe fitting 100.

[0045] Preferably, the cross section of the elbow pipe 100 is divided into four parts: A area, B area, C area and D area, see Figure 2 The 0 degree line is the upper part of the vertical diameter of the circular cross section of the elbow pipe 100, the sector corresponding to the A area is 135°-225° in the clockwise direction, the A area corresponds to the lower surface inside the elbow pipe 100, and the powder deposition increases due to the influence of gravity when powder spraying in the A area, the sector corresponding to the B area is 225°-315° in the clockwise direction, the B area corresponds to the inner side of the elbow pipe 100, and the area swept per unit time is relatively small when the powder spraying mechanism uniformly walks in the elbow section, the sector corresponding to the C area is 315°-45° in the clockwise direction, the C area corresponds to the upper surface inside the elbow pipe 100, and the powder deposition decreases due to the influence of gravity when powder spraying in the C area, and the sector corresponding to the D area is 45°-135° in the clockwise direction, the D area corresponds to the outer side of the elbow pipe 100, and the area swept per unit time is relatively large when the powder spraying mechanism uniformly walks in the elbow section;

[0046] According to the division of the A area, the B area, the C area and the D area, the plurality of powder spraying guns 201 are divided into an A area powder spraying gun group, a B area powder spraying gun group, a C area powder spraying gun group and a D area powder spraying gun group, see Figure 3 In this figure, the powder spraying mechanism is provided with eight powder spraying guns 201, which are uniformly arranged on the cross section of the head 301 position of the walking mechanism, and correspond to the A area, the B area, the C area and the D area of the elbow pipe 100;

[0047] When spraying the straight pipe section of the elbow pipe 100, the powder spraying amount of the A area powder spraying gun group < the powder spraying amount of the B and D area powder spraying gun groups < the powder spraying amount of the C area powder spraying gun group;

[0048] When spraying the elbow section of the elbow pipe 100, the powder spraying amount of the A area powder spraying gun group ≤ the powder spraying amount of the B area powder spraying gun group < the powder spraying amount of the C area powder spraying gun group < the powder spraying amount of the D area powder spraying gun group.

[0049] Preferably, the head 301 of the walking mechanism is provided with a plurality of powder spraying guns 201 uniformly distributed in the position cross section, each powder spraying gun 201 is connected with a digital proportional valve 401 through a powder conveying pipeline 204, the first to nth digital proportional valves 401 correspond to the first to nth powder spraying guns 201 of the A zone powder spraying gun group, the n+1th to 2nth digital proportional valves 401 correspond to the n+1th to 2nth powder spraying guns 201 of the B zone powder spraying gun group, the 2n+1th to 3nth digital proportional valves 401 correspond to the 2n+1th to 3nth powder spraying guns 201 of the C zone powder spraying gun group, and the 3n+1th to 4nth digital proportional valves 401 correspond to the 3n+1th to 4nth powder spraying guns 201 of the D zone powder spraying gun group; n is a natural number, for example, n=1, four powder spraying guns are provided, each powder spraying gun corresponds to one zone, and the swing angle of each powder spraying gun 201 is ±45°, and of course 2≤n≤10 can also be selected. According to the different pipe diameters of the elbow pipe fitting 100, the number of powder spraying guns 201 is different, that is, more for large pipes and less for small pipes; for example, n=2, eight powder spraying guns 201 are provided, and the swing angle of each powder spraying gun 201 is ±22.5°, see Figure 2 , or n=9, 36 powder spraying guns 201 are provided, and the swing angle of each powder spraying gun is ±5° or the swing angle of each powder spraying gun 201 is not greater than ±7°.

[0050] The PLC includes a main controller PLC0 and PLC1, PLC2, PLC3, and PLC4, the main controller PLC0 controls the operation of the walking servo motor 303, the swing servo motor 202, PLC1, PLC2, PLC3, and PLC4, PLC1 controls the opening degree of the first to nth digital proportional valves 401, PLC2 controls the opening degree of the n+1th to 2nth digital proportional valves 401, PLC3 controls the opening degree of the 2n+1th to 3nth digital proportional valves 401, and PLC4 controls the opening degree of the 3n+1th to 4nth digital proportional valves 401, see Figure 4 .

[0051] Preferably, the swing amplitude of the A zone powder spraying gun group, the B zone powder spraying gun group, the C zone powder spraying gun group, and the D zone powder spraying gun group is not greater than ±45°.

[0052] An application method of a bending pipe powder internal spraying uniform device for controlling the spraying amount in different zones, and the specific steps are as follows: S1, setting the operation parameters of the walking servo motor 303 according to the diameter of the bending pipe fitting 100, the length of the straight pipe section, and the length of the bending pipe section; in step S1, the length L1 of the straight pipe section 1, the working walking time t1 of the straight pipe section 1, the length L2 of the bending pipe section, the walking time t2 of the bending pipe section, the length L3 of the straight pipe section 2, and the working walking time t3 of the straight pipe section 2;

[0053] S2, according to the diameter of the elbow pipe fitting 100, the coating thickness requirement, and the specification of the powder gun 201, the powder amount parameters of the A, B, C, and D area powder gun groups are set; in step S2, the powder amount parameters and the corresponding digital proportional valve opening degree of the straight pipe section are first set, that is, the powder amount outflow speed value V1A and the corresponding digital proportional valve opening degree value W1A of the A area powder gun group of the straight pipe section, the powder amount outflow speed value V1B and the corresponding digital proportional valve opening degree value W1B of the B area powder gun group, the powder amount outflow speed value V1C and the corresponding digital proportional valve opening degree value W1C of the C area powder gun group, and the powder amount outflow speed value V1D and the corresponding digital proportional valve opening degree value W1D of the D area powder gun group, V1B = V1D, W1B = W1D, V1A < V1B = V1D < V1C, W1A < W1B = W1D < W1C, and then the powder amount parameters and the corresponding digital proportional valve opening degree value of the elbow pipe section are set, that is, the powder amount outflow speed value V2A and the corresponding digital proportional valve opening degree value W2A of the A area powder gun group of the elbow pipe section, the powder amount outflow speed value V2B and the corresponding digital proportional valve opening degree value W2B of the B area powder gun group, the powder amount outflow speed value V2C and the corresponding digital proportional valve opening degree value W2C of the C area powder gun group, and the powder amount outflow speed value V2D and the corresponding digital proportional valve opening degree value W2D of the D area powder gun group, V2A ≤ V2B < V2C < V2D, W2A ≤ W2B < W2C < W2D, and finally the rotation and swing parameters of the four powder gun groups are set, such as the rotation and swing angular velocity 25° / s and the rotation and swing amplitude of the four powder gun groups not greater than ±45°, for example, 8 powder guns 201 are set, the rotation and swing amplitude of each powder gun group is ±22.5°, and when the powder gun group rotates and swings, it can uniformly cover the inner wall of the elbow pipe fitting 100;

[0054] Table 1: A, B, C, and D area powder gun group powder amount parameter setting table, for example, 8 powder guns are set, and four powder gun groups are taken as an example.

[0055]

[0056] S3, the to-be-coated elbow pipe fitting 100 is in place, the walking mechanism travels to the farthest end of the elbow pipe fitting 100, the powder supply mechanism starts to work under the control of the control mechanism, the powder spraying servo motor works, the powder gun group starts to rotate and swing, the walking servo motor 303 works, and the walking trolley 302 drives the powder spraying mechanism to uniformly walk from the far end of the elbow pipe to the near end of the elbow pipe, while the powder spraying coating process is performed.

[0057] In step S3, the walking mechanism enters the elbow pipe from the proximal end of the elbow pipe fitting 100, travels to the distal end of the elbow pipe fitting 100, and after positioning, the walking servo motor 303 sends a positioning signal to the main controller PLC0. After receiving the signal, the main controller PLC0 sends the spray gun group swing parameters to the spray servo motor, and simultaneously sends the powder amount, powder output speed values of the straight pipe sections of the A, B, C, D area spray gun groups and the opening values of the digital proportional valves 401 to the corresponding digital proportional valves 401 through PLC1, PLC2, PLC3, PLC4, i.e. F1~F4n, and the spray gun group starts to swing according to the set swing parameters, and each digital proportional valve 401 opens according to the set parameters (the powder output amount is determined by the pipe pressure and the valve opening, and in order to facilitate the description, it is assumed that the powder conveying pipe 204 has a constant blowing pressure, which is adjusted only by the electromagnetic valve, so the valve opening determines the powder output amount), W1B=W1D, W1A

[0058] S4, after the elbow pipe is sprayed, the device stops working and waits for the next operation.

[0059] Specifically, for example, the FBE powder spraying of the elbow pipe fitting 100 with a diameter of 40 inches, 36 powder spraying guns 201 are divided into four powder spraying gun groups, and the swing amplitude of each powder spraying gun group is ±5° to ±6°. The more the powder spraying guns 201, the higher the overall spraying efficiency of the inner wall of the elbow pipe fitting 100.

[0060] 1. Specifications and sizes of the elbow pipe fitting 100: the elbow diameter is 1016 mm, and the elbow pipe fitting is composed of a straight pipe section 1 + an elbow pipe section + a straight pipe section 2. The length of the straight pipe section 1 is 5000 mm, the length of the straight pipe section 2 is 1000 mm, the bending angle of the elbow pipe section is 90°, and the center arc length of the elbow pipe is 3000 mm.

[0061] 2. Powder spraying mechanism: 36 powder spraying guns 201 are uniformly arranged on the cross-sectional circumference of the machine head 301, and the included angle between adjacent two guns is 10°. The partitioning of the 36 powder spraying guns 201 is as follows:

[0062] Table 2: Powder spraying gun partitioning

[0063]

[0064] 3. Control mechanism: brand: HuiChuan, model SIMATIC S7-1200 PLC, brand of digital proportional valve 401: Laibao, model: 35BY48L-11B, brand of swing servo motor 202 of the swing powder spraying mechanism: HuiChuan, model: MS1H3-18C15CD-T311Z, brand of walking servo motor 303 of the walking mechanism: HuiChuan, model: MS1H3-29C15CD-T311Z.

[0065] The devices are connected by network ports, and the control mechanism further includes a communication network cable. PLC0 is connected to the walking servo motor 303, the swing servo motor 202, PLC1, PLC2, PLC3, and PLC4 through the communication network cable.

[0066] 4. Specific parameter settings

[0067] (1) Swing angular velocity of the powder spraying gun group: 25° / s

[0068] (2) Swing amplitude of the powder spraying gun group: ±5°, of course, the swing amplitude can also be selected as ±6°, slightly larger than ±5°, so as to meet the uniform spraying requirement of the edge parts of adjacent regions and reduce the spraying error of the edge parts of adjacent regions caused by the self-weight of the powder as much as possible.

[0069] (3) Speed of the walking trolley 302: 20 mm / s, t1=250 s, t2=150 s, t3=50 s

[0070] (4) Powder spraying amount setting

[0071] Table 3: Powder spraying amount settings

[0072]

[0073] 5. According to the above parameters, a program for controlling the powder spraying amount of the elbow pipe is written, and is input into PLC0, PLC1, PLC2, PLC3, and PLC4.

[0074] 6. Powder spraying process

[0075] (1) The elbow pipe 100 to be coated is positioned. The walking mechanism enters the elbow pipe from the proximal end of the elbow pipe 100, travels to the distal end of the elbow pipe 100, and stops after positioning.

[0076] (2) After the walking servo motor 303 receives the positioning signal, the PLC0 sends the powder spraying gun group swing process parameters to the powder spraying mechanism servo motor, and sends the powder spraying gun group powder amount parameters of the straight pipe sections A, B, C, and D to the digital proportional valve group (F1-F36) through PLC1, PLC2, PLC3, and PLC4, respectively. The powder spraying gun group starts to swing according to the set parameters, with a swing amplitude of ±5° and an angular velocity of 25° / s. The digital proportional valve 401 opens according to the straight pipe section parameters in Table 3, the powder spraying mechanism starts to spray powder, and the walking servo motor 303 drives the powder spraying mechanism to travel at a speed of 20 mm / s from the distal end of the elbow pipe to the proximal end of the elbow pipe at a uniform speed, to perform the preset powder spraying operation of the straight pipe section 1. The PLC0 obtains the position information of the powder spraying mechanism in real time through communication with the walking servo motor 303.

[0077] (3) After 250 s, the powder spraying mechanism completes the internal spraying of the straight pipe section 1, travels to the connection between the straight pipe section 1 and the elbow pipe section, the PLC0 sends the powder spraying gun group powder amount parameters of the elbow pipe sections A, B, C, and D in Table 3 to the digital proportional valve group (F1-F36) through PLC1, PLC2, PLC3, and PLC4, respectively, the digital proportional valve adjusts according to the elbow pipe section parameters in Table 3, the powder spraying gun group swing parameters remain unchanged, the walking servo motor 303 operating parameters remain unchanged, the preset powder spraying operation of the elbow pipe section is performed, and the PLC0 obtains the position information of the powder spraying mechanism in real time through communication with the walking servo motor 303.

[0078] (4) After another 150 s, the powder spraying mechanism completes the internal spraying of the elbow pipe section, travels to the connection between the elbow pipe section and the straight pipe section 2, the PLC0 sends the powder spraying gun group powder amount parameters of the straight pipe sections A, B, C, and D to the digital proportional valve group (F1-F36) through PLC1, PLC2, PLC3, and PLC4, respectively, the digital proportional valve adjusts according to the straight pipe section parameters in Table 3, the powder spraying gun group swing parameters remain unchanged, the walking mechanism servo motor operating parameters remain unchanged, the preset powder spraying operation of the straight pipe section 2 is performed, and the PLC0 obtains the position information of the powder spraying mechanism in real time through communication with the walking servo motor 303.

[0079] (5), after 50s, the powder spraying mechanism completes the inner spraying of the straight pipe section 2, walks through all the straight pipe sections and elbow pipe sections, reaches the proximal end surface position of the elbow pipe fitting 100, the PLC 0 sends a stop command to the walking servo motor 303, simultaneously sends a stop command to the powder spraying servo motor, and sends a closing command to the digital proportional valve 401.

[0080] (6), the inner spraying of the elbow pipe fitting 100 is completed, and the device stops working, waiting for the next operation.

[0081] After the inner spraying process of the elbow pipe fitting 100 is completed, the sprayed elbow pipe coating is detected, the coating surface is good, there is no leakage point, and the coating thickness detection result is as follows:

[0082] A zone B zone C zone D zone Straight pipe section 1 303 μm 295 μm 291 μm 308 μm Bent pipe section 299 μm 306 μm 300 μm 320 μm Straight pipe section 2 301 μm 308 μm 295 μm 302 μm

[0083] The coating thickness detection result shows that the elbow pipe powder inner spraying uniform device and method for controlling the powder spraying amount in different zones can effectively improve the uniformity of the inner spraying coating thickness of the elbow pipe fitting 100, for example, the coating thickness difference between the inner side and the outer side of the elbow pipe section is 14 mu, the gap is small, the uniformity requirement of the spraying coating thickness is met, and the elbow pipe fitting is qualified, FBE powder is saved, and the production cost is reduced.

[0084] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0085] In addition, the terms "first" and "second" are only for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0086] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation made by using the content of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for applying a bend powder in-spray homogenizer for zoned control of the amount of powder, characterized in that: The pipe powder inner spraying uniform device for controlling the spraying amount of different zones comprises a walking mechanism and a rotary spraying mechanism, wherein the rotary spraying mechanism comprises a plurality of spraying guns (201) and a rotary servo motor (202), the plurality of spraying guns (201) are uniformly arranged on the position cross section of the head (301) of the walking mechanism, the plurality of spraying guns (201) are divided into different spraying gun groups according to the corresponding inner and outer positions of the elbow pipe and the height in the pipe, different spraying gun groups correspond to different pipe regions, and the spraying gun groups of different regions perform different spraying amounts, and the rotary servo motor (202) drives the head (301) to rotate and swing. In the process of spraying in the elbow pipe fitting (100), the uniform inner spraying of the straight pipe section and the elbow section of the elbow pipe fitting (100) is realized by the different spraying amount settings of the spraying gun groups corresponding to different zones, and / or in the process of spraying in the elbow pipe fitting (100), the uniform spraying of the inner side and the outer side in the elbow section is realized by the different spraying amount settings of the spraying gun groups corresponding to different zones. The cross section of the elbow pipe fitting (100) is divided into four parts: A zone, B zone, C zone and D zone, the upper part of the vertical diameter of the circular cross section of the elbow pipe fitting (100) is taken as the 0 degree line, the sector corresponding to the A zone is 135°-225° in the clockwise direction, the A zone corresponds to the lower surface in the elbow pipe fitting (100), the sector corresponding to the B zone is 225°-315° in the clockwise direction, the B zone corresponds to the inner side in the elbow pipe fitting (100), the sector corresponding to the C zone is 315°-45° in the clockwise direction, the C zone corresponds to the upper surface in the elbow pipe fitting (100), and the sector corresponding to the D zone is 45°-135° in the clockwise direction, and the D zone corresponds to the outer side in the elbow pipe fitting (100). According to the division of the A zone, the B zone, the C zone and the D zone, the plurality of spraying guns (201) are divided into the A zone spraying gun group, the B zone spraying gun group, the C zone spraying gun group and the D zone spraying gun group. When the straight pipe section of the elbow pipe fitting (100) is sprayed, the spraying amount of the A zone spraying gun group is less than the spraying amount of the B zone and the D zone spraying gun group, and the spraying amount of the C zone spraying gun group is the largest. When the elbow section of the elbow pipe fitting (100) is sprayed, the spraying amount of the A zone spraying gun group is less than or equal to the spraying amount of the B zone spraying gun group, the spraying amount of the C zone spraying gun group is the largest, and the spraying amount of the D zone spraying gun group is the smallest.

2. The application method of the pipe powder inner spraying uniform device for controlling the spraying amount of different zones according to claim 1, wherein the walking mechanism further comprises a walking servo motor (303) and a walking trolley (302), the walking trolley (302) is controlled by the walking servo motor (303) to drive the head (301) to move; The pipe powder inner spraying uniform device for controlling the spraying amount of different zones further comprises a powder supply mechanism and a control mechanism, the powder supply mechanism comprises a powder conveying pipeline (204), a digital proportional valve (401) and a powder source, each spraying gun (201) is provided with an independent powder conveying pipeline (204) connected to the powder source, and the digital proportional valve (401) is arranged on each powder conveying pipeline (204). ​ The control mechanism controls the operation of the swing servo motor (202), the walking servo motor (303) and the digital proportional valve (401).

3. The application method of the elbow pipe powder internal spraying uniform device for controlling the spraying amount in different zones according to claim 2, characterized in that: The control mechanism comprises a PLC, which controls the operation of the swing servo motor (202) and the walking servo motor (303); and the PLC controls the opening degree of the digital proportional valve (401), thereby controlling the spraying amount of each powder spraying gun (201) per unit time.

4. The application method of the bend powder inner spraying uniform device for controlling the powder spraying amount by partition according to claim 3, characterized in that: The movement form of the powder spraying gun group of the powder spraying mechanism is swing movement, which realizes different spraying amounts of the powder spraying gun groups corresponding to different zones.

5. The method of claim 4, wherein the method further comprises: adjusting the flow rate of the powder to be sprayed by adjusting the rotational speed of the motor. The machine head (301) of the walking mechanism is uniformly provided with 4n powder spraying guns (201) in the cross section, each powder spraying gun (201) is connected with a digital proportional valve (401) through a powder conveying pipeline (204), the first to nth digital proportional valves (401) correspond to the first to nth powder spraying guns (201) of the A-zone powder spraying gun group, the n+1th to 2nth digital proportional valves (401) correspond to the n+1th to 2nth powder spraying guns (201) of the B-zone powder spraying gun group, the 2n+1th to 3nth digital proportional valves (401) correspond to the 2n+1th to 3nth powder spraying guns (201) of the C-zone powder spraying gun group, and the 3n+1th to 4nth digital proportional valves (401) correspond to the 3n+1th to 4nth powder spraying guns (201) of the D-zone powder spraying gun group. The PLC comprises a main controller PLC0 and PLC1, PLC2, PLC3 and PLC4, and the main controller PLC0 controls the operation of the walking servo motor (303), the swing servo motor (202), PLC1, PLC2, PLC3 and PLC4. PLC1 controls the opening degree of the first to nth digital proportional valves (401). PLC2 controls the opening degree of the n+1th to 2nth digital proportional valves (401). PLC3 controls the opening degree of the 2n+1th to 3nth digital proportional valves (401). PLC4 controls the opening degree of the 3n+1th to 4nth digital proportional valves (401).

6. The application method of the bend powder inner spraying uniform device for controlling the powder spraying volume by partition according to claim 5, characterized in that: The swing amplitude of the A-zone powder spraying gun group, the B-zone powder spraying gun group, the C-zone powder spraying gun group and the D-zone powder spraying gun group is not greater than ±45°.

7. The application method of the elbow pipe powder internal spraying uniform device for controlling the spraying amount in different zones according to claim 6, and the specific steps are as follows: S1, setting the operation parameters of the walking servo motor (303) according to the diameter of the elbow pipe fitting (100), the length of the straight pipe section and the length of the elbow pipe section; S2, setting the powder amount parameters of the A, B, C and D zone powder spraying gun groups according to the diameter of the elbow pipe fitting (100), the coating thickness requirement, the specifications of the powder spraying guns (201) and the powder gun combination situation. S3, the pipe fitting (100) to be coated is in place, the walking mechanism travels to the farthest end of the pipe fitting (100), the control mechanism controls the powder supply mechanism to start working, the powder spraying servo motor works, the powder spraying gun group starts to rotate and swing, the walking servo motor (303) works, and the walking trolley (302) drives the powder spraying mechanism to uniformly walk from the far end of the pipe to the near end of the pipe while performing the powder spraying coating process; S4, the powder spraying in the pipe is completed, and the device stops working, waiting for the next operation.

8. The application method of the pipe powder internal spraying uniform device for partition control of powder spraying amount according to claim 7, characterized in that: In step S1, the length L1 of the straight pipe section 1, the working walking time t1 of the straight pipe section 1, the length L2 of the pipe section, the walking time t2 of the pipe section, the length L3 of the straight pipe section 2, and the working walking time t3 of the straight pipe section 2; In step S2, the powder amount parameters and the corresponding digital proportional valve opening degrees of the straight pipe sections are first set, that is, the powder amount outflow speed value V1A and the corresponding digital proportional valve opening degree value W1A of the powder spraying gun group in the A zone of the straight pipe section, the powder amount outflow speed value V1B and the corresponding digital proportional valve opening degree value W1B of the powder spraying gun group in the B zone, the powder amount outflow speed value V1C and the corresponding digital proportional valve opening degree value W1C of the powder spraying gun group in the C zone, and the powder amount outflow speed value V1D and the corresponding digital proportional valve opening degree value W1D of the powder spraying gun group in the D zone, V1B=V1D, W1B= W1D, V1A<V1B=V1D<V1C, W1A<W1B= W1D<W1C, the powder amount parameters and the corresponding digital proportional valve opening degree values of the pipe section are set, that is, the powder amount outflow speed value V2A and the corresponding digital proportional valve opening degree value W2A of the powder spraying gun group in the A zone of the pipe section, the powder amount outflow speed value V2B and the corresponding digital proportional valve opening degree value W2B of the powder spraying gun group in the B zone, the powder amount outflow speed value V2C and the corresponding digital proportional valve opening degree value W2C of the powder spraying gun group in the C zone, and the powder amount outflow speed value V2D and the corresponding digital proportional valve opening degree value W2D of the powder spraying gun group in the D zone, V2A≤V2B<V2C<V2D, W2A≤W2B<W2C<W2D, and finally the rotating and swinging parameters of the four powder spraying gun groups are set. In step S3, the walking mechanism enters the elbow pipe from the proximal end of the elbow pipe fitting (100), travels to the distal end of the elbow pipe fitting (100), and after positioning, the walking servo motor (303) sends a positioning signal to the main controller PLC0. After receiving the signal, the main controller PLC0 sends the spray gun group swing parameters to the spray servo motor, and simultaneously sends the powder amount, powder discharge speed values and digital proportional valve (401) opening values of the straight pipe sections of the A, B, C, D area spray gun groups to the corresponding digital proportional valves (401) through PLC1, PLC2, PLC3, PLC4, namely F1~F4n. The spray gun group starts to swing according to the set swing parameters, each digital proportional valve (401) opens according to the set parameters, W1B= W1D, W1A<W1B= W1D <W1C, the powder supply pipeline supplies powder to the spray gun group, ensuring V1A<V1B=V1D<V1C, and the straight pipe section powder spraying operation is performed. At the same time, the walking servo motor (303) drives the spray mechanism to travel at a uniform speed from the distal end of the elbow pipe to the proximal end of the elbow pipe; after a period of time t1, the spray mechanism travels to the connection between the straight pipe section 1 and the elbow pipe section, the main controller PLC0 sends the powder amount, powder discharge speed values and digital proportional valve (401) opening values of the elbow pipe section of the A, B, C, D area spray gun groups to the corresponding digital proportional valves (401) through PLC1, PLC2, PLC3, PLC4, namely F1~F4n, and performs the preset elbow pipe section powder spraying process. At this time, W2A≤W2B<W2C<W2D, V2A≤V2B<V2C<V2D; after another period of time t2, the spray mechanism travels to the connection between the elbow pipe section and the straight pipe section 2, the main controller PLC0 sends the powder amount, powder discharge speed values and digital proportional valve (401) opening values of the straight pipe section of the A, B, C, D area spray gun groups to the corresponding digital proportional valves (401) through PLC1, PLC2, PLC3, PLC4, and performs the straight pipe section 2 powder spraying operation. At this time, W1A<W1B= W1D <W1C, V1A<V1B=V1D<V1C; finally, after a period of time t3, the spray mechanism travels through all the straight pipe and elbow pipe sections and reaches the proximal end face position of the elbow pipe fitting (100), the main controller PLC0 sends a stop command to the walking servo motor (303) and a stop command to the spray servo motor, and sends a closing command to each digital proportional valve (401) through PLC1, PLC2, PLC3, PLC4.

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