Spraying machine for inner wall of large-inner-diameter metal pipeline

Abstract

A spraying machine for the inner wall of a large-inner-diameter metal pipeline relates to the technical field of spraying and is provided with a paint spraying mechanism, a rack and a rolling walking wheel rim mechanism, the paint spraying mechanism and the rolling walking wheel rim mechanism are both installed on the rack, supporting legs are arranged on the rolling walking wheel rim mechanism and can be controlled to stretch out and draw back, and the inner wall of the metal pipeline can be sprayed out along with rotation of the rolling walking wheel rim mechanism. When the rack moves to the end of the pipeline, the telescopic function of the supporting legs is started, the problem that a spraying machine falls or inclines due to the thickness change of the pipe wall can be solved, and then operation of the paint spraying mechanism is stabilized; and the paint spraying quality of the end of the pipeline is better guaranteed. Spraying can be achieved through manual remote control, and paint spraying operation can be conducted on site without pipeline carrying.

Description

Technical Field

[0001] The invention relates to the technical field of spraying paint or atomization, in particular to a device for spraying paint on the inner wall of a metal pipe with a large inner diameter. Background Art

[0002] In order to increase the corrosion resistance of water and gas pipelines in the petroleum, chemical and other industries, it is necessary to carry out anti-corrosion treatment on the inner wall of the pipeline and spray an anti-corrosion layer on the inner wall of the pipeline. The existing manual drilling into the pipeline for spraying has low spraying efficiency, especially the upward spraying is difficult to operate, the spraying quality is difficult to guarantee, and the spraying pollutants accumulated in the pipeline seriously affect the health of the operators.

[0003] After searching the literature in the relevant technical field, the technical solution disclosed in the Chinese invention patent with application number "CN202111049207.4" and name "A large-scale pipeline inner wall spraying equipment and method thereof" is: the large-scale pipeline inner wall spraying equipment includes a base, and the two ends of the base are respectively connected to the support seat through a cylinder, the pipeline is detachably engaged in the support seat, and the support seat is respectively provided with a traction mechanism; the traction mechanism includes a frame fixed on the support seat, a roller is rotatably provided on the frame, and a wire lever along the vertical direction is also fixed on the frame, a lead screw nut is sleeved on the lead screw nut, and the lead screw nut is connected to the cross bar, and a guide sleeve is fixed in the middle of the cross bar, so that the rotating lead screw lever can drive the guide sleeve to move in the vertical direction; a spraying mechanism is provided in the pipeline, and locking ropes are respectively provided at both ends of the spraying mechanism, one end of the locking rope is wound around the roller, and the other end passes through the guide sleeve and is detachably connected to the spraying mechanism, so that the rotating roller can drive the spraying mechanism to reciprocate in the pipeline through the locking rope.

[0004] Existing patent documents solve the various disadvantages of manual spraying by setting up a spraying mechanism in the pipeline, but cannot completely solve the problem of painting the inner wall of a large inner diameter metal pipeline. First, the movement of the guide wheel of the spraying mechanism in the existing patent in the inner wall of the pipeline will cause damage to the surface of the inner wall of the pipeline, thereby affecting the final spraying quality. Second, in the prior art, the workpiece to be processed needs to be transported to the rack before the spraying operation can be carried out. Large metal pipelines are large in size and heavy in weight, and are difficult to transport. Third, if the pipeline is placed on a flat ground for painting, the spraying mechanism needs to run out of the pipeline when it runs from one end of the pipeline to the other end, otherwise the end of the pipeline will not be able to be sprayed. On the other hand, the wall thickness of the pipeline is relatively large. When the spraying mechanism runs out of the pipeline, the spraying mechanism will fall or tilt at the end of the pipeline, causing the spraying mechanism to shake, and ultimately affecting the stability of the spraying operation and the quality of the paint layer.

[0005] Therefore, the industry is in urgent need of a large inner diameter metal pipe inner wall spraying machine that can solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a large inner diameter metal pipe inner wall spraying machine, which is used to solve the disadvantages brought by manual spraying. In addition to not having to move the pipe and conveniently spraying paint on the spot, it also specifically solves the problem of unstable paint quality caused by falling or tilting at the end of the pipe when the spraying mechanism moves out of the inner wall of the pipe.

[0007] To achieve the above object, the present invention adopts the following technical solution: A large inner diameter metal pipe inner wall spraying machine comprises a paint spraying mechanism, a frame and a rolling wheel rim mechanism, wherein the paint spraying mechanism and the rolling wheel rim mechanism are both mounted on the frame; the paint spraying mechanism comprises a paint mixing ring, a nozzle, a mixer, a high-pressure gas tank, a paint liquid tank, a support rod, a fixed disk, a gas distribution ring and a nozzle fixing ring, wherein the fixed disk is mounted on the frame, the paint mixing ring and the gas distribution ring are fixed by the support rod and the fixed disk, the nozzles are evenly distributed along the circumference of the nozzle fixing ring, the mixer is mounted in combination with the nozzle, the high-pressure gas tank and the paint liquid tank are arranged on the frame, and the mixers are connected through pipelines of the paint mixing ring and the paint distribution ring; after the paint liquid is mixed in the mixer, it is sprayed out from the nozzle.

[0008] In the above-mentioned large inner diameter metal pipe inner wall spraying machine, the rolling walking wheel rim mechanism is provided with four sets, all of which have the same structure, are in groups of two, and are respectively located on both sides of the frame; the rolling walking wheel rim mechanism includes a leg mechanism, a magnetic steel, a wheel rim, a spoke, a power supply configuration disk, an axle, a bushing, a position sensor and a drive motor, the axle is installed on the frame, the wheel rim is supported by the spokes and installed on the bushing, and the drive motor drives the wheel rim to rotate; the power supply configuration disk is installed on the bushing and the spokes, and each position sensor is installed on the power supply configuration disk, and the matching magnetic steel is arranged on the frame, and multiple sets of position sensors are arranged, and the number of the position sensors matches the number of the leg mechanisms; the number of the leg mechanisms is sets, which are evenly distributed on the wheel rim along the circumference.

[0009] The above-mentioned large inner diameter metal pipe inner wall spraying machine, the leg mechanism includes an electromagnet DCT, a leg, a reset spring and a guide cylinder, the shell of the electromagnet DCT is connected to the guide cylinder through a connecting flange, and the guide cylinder is fixed to the wheel rim through a fixing frame; an upper limit ring and a lower limit ring are provided on the leg to limit the upper and lower limit distances of the leg movement; the reset spring is arranged between the yoke and the core cap of the electromagnet to provide a reset force for the core; the leg is arranged in the guide cylinder, and when the core is energized and moves downward, the leg is pushed to contact the ground.

[0010] In the above-mentioned large inner diameter metal pipe inner wall spraying machine, the support leg mechanism is provided with a control circuit, and the control circuit includes a position sensor, a magnet, a first resistor R, a second resistor R, a transistor T and a relay J. The position sensor is arranged on a power supply configuration disk, and the magnet matched with the position sensor is fixed on a frame. When the position sensor rotates to within the action angle range of ±δ° of the magnet, the magnet turns on the position sensor, the power supply of the control circuit is turned on, and the control circuit starts to work; when the position sensor rotates out of the angle range of ±δ°, the magnet turns off the position sensor, and the power supply of the control circuit is turned off; the first resistor R and the second resistor R are connected in series to provide a bias voltage for the transistor T, the coil of the relay J is connected to the collector circuit of the transistor T, and its normally open contact J is connected to the coil of the electromagnet DCT.

[0011] In the above-mentioned large inner diameter metal pipe inner wall spraying machine, the legs are inclined outwardly relative to the rolling walking wheel rim mechanism.

[0012] The present invention has the following advantages: The present invention is provided with a paint spraying mechanism, a frame and a rolling wheel rim mechanism, both of which are mounted on the frame, and a leg is provided on the rolling wheel rim mechanism, and the leg can be controlled to be extended and retracted, and with the rotation of the rolling wheel rim mechanism, the frame is driven to move in the pipe cylinder, and then the paint spraying mechanism is driven to move to spray paint on the inner wall of the pipe, and when the frame runs to the end of the pipe, the extension function of the leg is turned on, which can eliminate the problem of falling or tilting of the paint spraying mechanism caused by the thickness of the pipe wall, and thus better ensure the quality of painting at the end of the pipe. The present invention can be controlled by manual remote control, and the painting in the pipe can be automatically carried out, and the paint spraying mechanism can be used nearby for painting without carrying the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the relative positions of the rack and the inner wall of the pipeline; Figure 3 It is the structural principle diagram of the paint spraying mechanism; Figure 4 It is a structural schematic diagram of a rolling travel wheel rim mechanism; Figure 5 It is a structural diagram of the outrigger mechanism part; Figure 6 It is the electrical schematic diagram of the outrigger control circuit part; The reference numerals in the figure represent: 1, paint spraying mechanism, 1-1, paint distribution ring, 1-2, nozzle, 1-3, mixer, 1-4, high-pressure gas tank, 1-5, paint liquid tank, 1-6, support rod, 1-7, fixed plate, 1-8, gas distribution ring, 1-9, nozzle fixing ring, 2, pipeline cylinder, 3, frame, 4, rolling walking wheel rim mechanism, 4-1, outrigger mechanism, 4-1-1, outrigger, DCT, electromagnet, 4-1-2, return spring, 4-1-3, guide cylinder, 4-1-4, connecting flange, 4-1-5 , fixing frame, 4-1-6, upper limit ring, 4-1-7, lower limit ring, 4-1-8, iron core, 4-2, magnet, 4-3, rim, 4-4, spokes, 4-5, power supply configuration plate, 4-6, axle, 4-7, bushing, 4-8, position sensor, 4-9, drive motor, T1, transistor, J1, relay, R1, first resistor, R2, second resistor, D1, freewheeling diode, G1, first photoelectric sensor, G2, second photoelectric sensor. DETAILED DESCRIPTION

[0014] The overall structure of the present invention is as follows Figure 1 As shown, it includes a paint spraying mechanism 1, a frame 3 and a rolling wheel rim mechanism 4, wherein the paint spraying mechanism 1 and the rolling wheel rim mechanism 4 are both installed on the frame 3; the rolling wheel rim mechanism 4 drives the paint spraying mechanism 1 to move from left to right to perform paint spraying operation on the inner wall of the pipeline.

[0015] The paint spraying mechanism 1 and the rolling wheel rim mechanism 4 of the present invention are both installed on a frame 3; the paint spraying mechanism 1 includes a paint mixing ring 1-1, a nozzle 1-2, a mixer 1-3, a high-pressure gas tank 1-4, a paint liquid tank 1-5, a support rod 1-6, a fixed disk 1-7, a gas distribution ring 1-8 and a nozzle fixing ring 1-9, the fixed disk 1-7 is installed on the frame 3, the paint mixing ring 1-1 and the gas distribution ring 1-8 are fixed by the support rod 1-6 and the fixed disk 1-7, the nozzle 1-2 is evenly distributed along the circumference of the paint mixing ring 1-1, the mixer 1-3 is installed in conjunction with the nozzle 1-2, the high-pressure gas tank 1-4 and the paint liquid tank 1-5 are arranged on the frame 3, and are connected to each mixer 1-3 through the pipelines of the paint mixing ring 1-1 and the gas distribution ring 1-8; after the paint liquid is mixed in the mixer 1-3, it is sprayed out from the nozzle 1-2.

[0016] The mixer of the present invention utilizes the jet principle to suck the paint liquid into the mixer through high-speed airflow, spray it out at high speed after mixing, and crush the paint liquid into tiny droplets, which are coated on the inner wall in a mist form to form a uniform paint film. Since the spraying process is carried out in the forward direction, the stability of the forward direction determines whether the paint film is uniform.

[0017] The rolling wheel rim mechanism 4 of the present invention is provided with four groups, which are configured in front and rear groups and are installed on the wheel axle 4-6. The four groups of rolling wheel rim mechanisms 4 have the same structure. The driving motor 4-9 drives the wheel rim 4-3 to rotate through the wheel axle 4-6. The rolling wheel rim mechanism 4 is provided with a leg mechanism 4-1, and the leg mechanism 4-1 is provided with 15-40 sets, which are evenly distributed on the wheel rim 4-3 along the circumference. The more the number of legs is provided, the smoother the operation of the frame 3 is.

[0018] The paint spraying operation of the present invention is started or closed by an electric switch, and further operations are carried out by manual control or automatic control in cooperation with each other, thereby reducing manual intervention as much as possible and improving the paint spraying efficiency. The paint spraying mechanism of the present invention is arranged on the left side of the frame 3, and the paint spraying operation starts after the frame completely enters the pipeline cylinder 2.

[0019] The paint spraying trolley moves forward while spraying paint. Since the wall thickness of the pipe is about 20-40 mm, when it is about to go out of the pipe, its protruding legs will suddenly sink, which may cause the paint spraying trolley to bump and affect the uniformity of the paint spraying. For this reason, the present invention is also provided with a position sensor 4-8 for detecting the rotation position of the power supply configuration disk 4-5. The position sensor 4-8 is arranged on the power supply configuration disk 4-5, and the magnetic steel 4-2 matched with the position sensor 4-8 is arranged on the frame 3. When the position sensor 4-8 rotates to the action angle range of the magnetic steel 4-2, the normally open contact of the position sensor 4-8 is connected, and the corresponding electromagnet DCT is energized. The iron core 11 overcomes the elastic force of the reset spring 5 and moves downward, pushing the legs out to touch the ground. The distance of the push-out is the wall thickness of the pipe, so that the rolling walking wheel rim mechanism 4 will not bump. The electromagnet adjusts the action angle of the position sensor to δ, that is, within the range of ±δ°, the magnet 4-2 can turn on the position sensor 4-8. When it moves out of the range of ±δ°, the magnet turns off the position sensor 4-8 and disconnects the power supply of the control circuit. The position sensor 4-8 of the present invention adopts a reed switch, which has a simple control circuit, reliable operation, and can open and close the circuit well.

[0020] The leg support mechanism 4-1 of the present invention is shown in Figure 5It includes an electromagnet DCT, a leg 4-1-1, a reset spring 4-1-2 and a guide cylinder 4-1-3, wherein the yoke housing of the electromagnet DCT is connected to the guide cylinder 4-1-3 through a connecting flange 4-1-4, and the guide cylinder is fixed on the wheel rim 4-3 through a fixing frame 4-1-5; the reset spring 4-1-2 is arranged between the yoke of the electromagnet and the iron core cap to provide a reset force for the iron core; the leg 4-1-1 is arranged in the guide cylinder, and when the iron core 4-1-8 is energized and moves downward, the leg is pushed to contact the ground. The leg of the present invention is provided with an upper limit ring 4-1-6 and a lower limit ring 4-1-7, which are used to limit the upper and lower limit distances of the leg movement, so that the leg is extended to a degree that it just touches the ground, thereby preventing the wheel rim from falling off a cliff and making the wheel rim run smoothly. The end of the leg of the present invention is arranged in an arc shape to prevent the leg from scratching the inner wall of the pipeline during movement.

[0021] The present invention is also provided with a control circuit of the electromagnet DCT, the control circuit is composed of a first resistor R1, a second resistor R2, a transistor T1, and a relay J1, the first resistor R1 and the second resistor R2 are connected in series to provide a bias voltage for the transistor T1, the coil of the relay J1 is connected to the collector circuit of the transistor T1, and its normally open contact J1-1 is connected to the coil of the electromagnet DCT. As the wheel rim rotates, when the position sensor 4-8 enters the action angle range of the magnetic steel 4-2, the position sensor 4-8 is turned on, so that the control circuit of the electromagnet DCT is turned on, the electromagnet DCT is energized and actuated, the legs are pushed out to touch the ground, and no bumps are generated.

[0022] The present invention also sets two photoelectric sensors on the frame 3, both of which are reflective photoelectric sensors, namely the first photoelectric sensor G1 and the second photoelectric sensor G2. The photoelectric sensors are used to detect the positions of the left and right wheel rims 4-3 on the frame 3 relative to the pipe cylinder, and are fixed on the left sides of the two wheel rims 4-3 respectively. If the photoelectric sensor can detect the reflected signal of the inner wall of the pipe cylinder, it means that the wheel rim 4-3 has not been completely moved out of the pipe cylinder, and the wheel rim 4-3 continues to move in the pipe cylinder. The photoelectric sensor uses this detection signal to assist in controlling the telescopic action of the legs. If the first photoelectric sensor G1 detects that the right wheel rim 4-3 is completely moved out of the pipe cylinder, it means that the wheel rim 4-3 has been completely moved out of the pipe cylinder. At this time, all the legs on the wheel rim 4-3 can be uniformly retracted or extended. As long as the size of the legs extended or retracted is consistent, no bumps will occur.

[0023] The number of outriggers is selected within the range of 15-40. The more the number, the smoother the walking, but the more complex the structure. The angle δ is related to the number of outriggers. The more the number of outriggers, the smaller the angle δ.

[0024] The reed switch in the present invention can be of HSR-03 or MKA-07101; the first photoelectric sensor G1 and the second photoelectric sensor G2 can be of VS3 type, which is a reflective photoelectric sensor with a working distance of 0.2-1.0m and ABS package.

Claims

1. A large inner diameter metal pipe inner wall spraying machine, characterized in that: The invention comprises a paint spraying mechanism (1), a frame (3) and a rolling wheel rim mechanism (4), wherein the paint spraying mechanism (1) and the rolling wheel rim mechanism (4) are both mounted on the frame (3); the paint spraying mechanism (1) comprises a paint distribution ring (1-1), a nozzle (1-2), a mixer (1-3), a high-pressure gas tank (1-4), a paint liquid tank (1-5), a support rod (1-6), a fixing plate (1-7), a gas distribution ring (1-8) and a nozzle fixing ring (1-9), wherein the fixing plate (1-7) is mounted on the frame (3). The paint distribution ring (1-1) and the gas distribution ring (1-8) are fixed by a support rod (1-6) and a fixing plate (1-7); the nozzles (1-2) are evenly distributed along the circumference of the nozzle fixing ring (1-9); the mixer (1-3) and the nozzle (1-2) are installed in combination; the high-pressure gas tank (1-4) and the paint liquid tank (1-5) are arranged on a frame (3) and are connected to each mixer (1-3) through pipelines of the paint distribution ring (1-1) and the gas distribution ring (1-8); after the paint liquid is mixed in the mixer (1-3), it is sprayed out from the nozzle (1-2).

2. A large inner diameter metal pipe inner wall spraying machine according to claim 1, characterized in that: The rolling walking wheel rim mechanism (4) is provided with four sets, all of which have the same structure, and are arranged in groups of two, and are respectively located on both sides of the frame (3); the rolling walking wheel rim mechanism (4) comprises a leg mechanism (4-1), a magnetic steel (4-2), a wheel rim (4-3), a spoke (4-4), a power supply configuration plate (4-5), a wheel axle (4-6), a shaft sleeve (4-7), a position sensor (4-8) and a drive motor (4-9); the wheel axle (4-6) is mounted on the frame (3), the wheel rim (4-3) is supported by the spoke (4-4) and is mounted on the shaft The invention relates to a wheel rim (4-3) having a plurality of positions, wherein the position sensors (4-8) are mounted on the shaft sleeve (4-7), and the driving motor (4-9) drives the wheel rim (4-3) to rotate; the power supply configuration disk (4-5) is mounted on the shaft sleeve (4-7) and the spokes (4-4); each position sensor (4-8) is mounted on the power supply configuration disk (4-5), and the magnetic steel (4-2) matched therewith is arranged on the frame (3); a plurality of sets of position sensors (4-8) are arranged, and the number of the position sensors (4-8) matches the number of the leg mechanisms (4-1); the number of the leg mechanisms (4-1) is 15-40 sets, and they are evenly distributed on the wheel rim (4-3) along the circumference.

3. A large inner diameter metal pipe inner wall spraying machine according to claim 2, characterized in that: The leg mechanism (4-1) comprises an electromagnet DCT, a leg (4-1-1), a reset spring (4-1-2) and a guide cylinder (4-1-3); the housing of the electromagnet DCT is connected to the guide cylinder (4-1-3) via a connecting flange (4-1-4); the guide cylinder is fixed to the wheel rim (4-3) via a fixing frame (4-1-5); an upper limit ring (4-1-6) and a lower limit ring (4-1-7) are provided on the leg to limit the upper and lower limit distances of movement of the leg; the reset spring (4-1-2) is arranged between the yoke and the core cap of the electromagnet to provide a reset force for the core (4-1-8); the leg (4-1-1) is arranged in the guide cylinder, and when the core is energized and moves downward, the leg is pushed to contact the ground.

4. A large inner diameter metal pipe inner wall spraying machine according to claim 2, characterized in that: The leg mechanism (4-1) is provided with a control circuit, which comprises a position sensor (4-8), a magnet (4-2), a first resistor R1, a second resistor R2, a transistor T1 and a relay J1. The position sensor (4-8) is arranged on a power supply configuration plate (4-5), and the magnet (4-2) matched with the position sensor (4-8) is fixed on a frame (3). When the position sensor (4-8) rotates to within the range of ±δ° of the action angle of the magnet, the magnet (4-2) turns on the position sensor (4-8), turns on the power of the control circuit, and starts the control circuit to work; when the position sensor (4-8) rotates out of the range of ±δ°, the magnet turns off the position sensor (4-8), turns off the power of the control circuit; the first resistor R1 and the second resistor R2 are connected in series to provide a bias voltage for the transistor T1, the coil of the relay J1 is connected to the collector circuit of the transistor T1, and its normally open contact J1-1 is connected to the coil of the electromagnet DCT.

5. The large inner diameter metal pipe inner wall spraying machine according to claim 2, characterized in that: The supporting legs (4-1-1) are inclined outwardly relative to the rolling wheel rim mechanism (4).

Images