Automatic powder spraying method for hydraulic support oil cylinder body

Abstract

An automatic powder spraying method for a hydraulic support oil cylinder body specifically comprises the following steps that S1, the cylinder body is vertically hung on a powder spraying line power and free chain; s2, a grating automatic recognition mechanism recognizes the size of the cylinder body and sends the size to the control system; s3, the control system automatically adjusts the rhythm and powder spraying parameters of the powder spraying line power and free chain according to the size of the cylinder body; s4, the powder spraying line power and free chain stops the cylinder body at a powder spraying station in the spraying room, the cylinder body is kept still, and the control system controls an automatic powder spraying mechanism of the reciprocating machine to spray powder towards a gap between the liquid passing pipe and the cylinder body according to the powder spraying parameters; s5, the control system enables the cylinder body to rotate according to the powder spraying parameters, and meanwhile the reciprocating machine automatic powder spraying mechanism is controlled to spray powder on the surface of the cylinder body; s6, after powder spraying is completed, the cylinder body subjected to powder spraying is moved to the next procedure through the powder spraying line power and free chain; and the steps from S1 to S6 are repeated, and powder is sprayed to all the cylinder bodies one by one. Manual supplementary spraying is omitted, efficiency is high, and powder spraying parameters correspond to the size of the cylinder body.

Description

Technical Field

[0001] This invention relates to the field of powder coating technology for hydraulic support cylinder bodies, and more specifically, to an automatic powder coating method for hydraulic support cylinder bodies. Background Technology

[0002] Powder coating of the hydraulic support cylinder body is a crucial step in the production process of hydraulic support cylinders. For example... Figure 1 As shown, cylinder 2 is a rotating body with a length of 200mm≤L1≤4000mm and an outer diameter of 83mm≤φD≤φ735mm. A liquid passage pipe 1 is welded to the outer circle of cylinder 2. Currently, the cylinder body powder coating is mainly carried out by a combination of automatic powder coating using a reciprocating machine and manual touch-up coating.

[0003] Automatic powder spraying machine: The cylinder is suspended vertically. When it enters the spray booth, the cylinder continues to move forward and starts to rotate at the same time. That is, the cylinder moves forward and rotates at the same time. The reciprocating machine follows the cylinder forward, and at the same time, the spray gun on the reciprocating machine moves up and down to spray powder onto the outer surface of the cylinder.

[0004] Manual touch-up spraying: After the reciprocating machine automatically sprays powder, manual touch-up spraying is performed on the exposed bottom area below the welded liquid pipe on the outer circle of the cylinder.

[0005] The above powder spraying method has the following disadvantages:

[0006] (1) The spray gun moving speed, spray gun position, and cylinder rotation speed are usually fixed and cannot be dynamically matched with the cylinder size, resulting in a large difference in coating thickness after powder spraying on different cylinders (>60um), which seriously affects the coating quality.

[0007] (2) The distance between the liquid pipe welded to the outer surface of the cylinder body and the outer surface of the cylinder body is small, S≤2mm, and there is an exposed bottom at the bottom of the liquid pipe. Manual re-spraying is required for the exposed bottom, which is inefficient and cannot achieve fully automated powder spraying operation.

[0008] (3) The cylinder moves forward and rotates at the same time. The forward speed of the reciprocating machine needs to match the forward speed of the cylinder. However, the spray booth is long and has many fault points. It is very easy for the forward speed of the reciprocating machine to be mismatched with the forward speed of the cylinder, resulting in uneven coating thickness of the cylinder. Summary of the Invention

[0009] The purpose of this invention is to address the shortcomings of existing technologies by providing an automatic powder spraying method for hydraulic support cylinder bodies.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is: an automatic powder coating method for hydraulic support cylinder bodies, wherein powder coating operations are performed through a powder coating line for hydraulic support cylinder bodies; the powder coating line for hydraulic support cylinder bodies includes a powder coating line accumulation chain, a spray booth, an automatic grating recognition mechanism, an automatic cylinder body rotation mechanism, a reciprocating automatic powder coating mechanism, and a control system; the powder coating line accumulation chain passes through the spray booth from front to back; a rotating hanger for suspending the cylinder body is provided on the trolley assembly of the powder coating line accumulation chain; the automatic grating recognition mechanism is arranged at the entrance of the spray booth for automatically recognizing passing cylinder bodies. The dimensions are sent to the control system. The automatic cylinder rotation mechanism and the automatic reciprocating powder spraying mechanism are both located at the powder spraying station in the spraying chamber and are respectively located on the left and right sides of the powder spraying line accumulation chain. The automatic cylinder rotation mechanism can drive the rotating hanger stopped at the powder spraying station to rotate the cylinder. The automatic reciprocating powder spraying mechanism can spray powder toward the cylinder stopped at the powder spraying station. The control system controls the operation of the powder spraying line accumulation chain, the automatic cylinder rotation mechanism and the automatic reciprocating powder spraying mechanism according to the cylinder size identified by the automatic grating recognition mechanism.

[0011] Specifically, the following steps are included:

[0012] S1. The cylinder body to be sprayed with powder is vertically suspended on one of the corresponding rotating hangers on the powder spraying line accumulation chain;

[0013] S2. The powder spraying line accumulation chain drives the cylinder through the grating automatic recognition mechanism, which identifies the cylinder size and sends the identified cylinder size to the control system. The cylinder size includes the outer diameter and length of the cylinder.

[0014] S3. The control system compares the cylinder size identified by the grating automatic recognition mechanism with the cylinder size stored in the database to accurately determine the cylinder structure and size. The control system automatically adjusts the cycle time and powder spraying parameters of the powder spraying line accumulation chain according to the cylinder structure and size to ensure uniform coating thickness. The powder spraying parameters include the cylinder rotation linear speed and the working parameters of the reciprocating automatic powder spraying mechanism.

[0015] S4. When the powder spraying line accumulation chain drives the cylinder into the powder spraying station in the spraying chamber, the cylinder stops at the powder spraying station. The cylinder automatic rotation mechanism drives the rotating hanger to rotate the cylinder so that the liquid pipe on the cylinder is aligned with the conveying direction of the powder spraying line accumulation chain. Then, the cylinder automatic rotation mechanism stops, keeping the cylinder stationary. The control system controls the reciprocating automatic powder spraying mechanism to spray powder into the gap between the liquid pipe and the cylinder according to the powder spraying parameters.

[0016] S5. After the powder spraying is completed in the gap between the liquid pipe and the cylinder, the control system controls the cylinder automatic rotation mechanism to drive the rotating hanger to start rotating the cylinder according to the powder spraying parameters, and at the same time controls the reciprocating automatic powder spraying mechanism to spray powder toward the cylinder surface.

[0017] S6. After the powder coating is completed, the automatic rotation mechanism of the cylinder stops driving, the automatic powder coating mechanism of the reciprocating machine stops powder coating and resets, and at the same time, the powder coating line accumulation chain drives the cylinder to continue moving, so that the powder-coated cylinder is conveyed out from the outlet of the spray booth and moved to the next process.

[0018] Repeat steps S1 to S6 to spray powder onto all cylinder blocks one by one.

[0019] Based on the above, the automatic grating recognition mechanism includes two laser gratings. A grating chamber is provided at the front of the entrance of the spray booth. The powder spraying line accumulation chain passes through the grating chamber from front to back. The two laser gratings are symmetrically arranged on both sides of the powder spraying line accumulation chain and are respectively installed in the grating chamber. The control system is signal-connected to the two laser gratings.

[0020] Based on the above, the rotating hoist includes a rotating rod, the upper end of which is rotatably mounted on the trolley assembly of the powder spraying line accumulation chain. A driven gear is coaxially fixedly mounted on the outer circumference of the rotating rod, and a hanging ring is provided at the lower end of the rotating rod. When suspending the cylinder body, a cylinder port plug is pre-tightly fitted in the cylinder port of the cylinder body. A lifting lug is provided on the cylinder port plug. The lifting lug is connected to the hanging ring through a lifting rod with hooks at both ends, thereby allowing the cylinder body to be vertically suspended on the hanging ring.

[0021] Based on the above, the automatic cylinder rotation mechanism includes a drive motor and a drive gear. The drive motor is vertically installed in the powder spraying station inside the spray booth via a bracket and is at the same height as the powder spraying line accumulation chain. The drive motor is located on the left or right side of the powder spraying line accumulation chain. The drive gear is fixedly installed at the lower end of the motor shaft of the drive motor and can mesh with the driven gear of the rotating hanger stopped at the powder spraying station. The control system controls the rotation of the drive motor. The control system also controls the speed of the drive motor according to the powder spraying parameters, thereby controlling the linear speed of the cylinder rotation.

[0022] Based on the above, the reciprocating automatic powder spraying mechanism includes several first spray guns, second spray guns, slides, and a base. The horizontal direction is defined as the X-axis, the horizontal direction as the Y-axis, and the vertical direction as the Z-axis. The slide can move along the Y-axis on the base via a Y-axis linear mechanism. The base is fixedly installed on the ground to the left or right of the powder spraying station within the spray booth. A row of Z-axis linear mechanisms is arranged at intervals on the slide. Each Z-axis linear mechanism has an X-axis linear mechanism on its slider, and these X-axis linear mechanisms are arranged at intervals vertically. The second spray gun is installed on the lowest X-axis linear mechanism, with its nozzle bent upwards. Each first spray gun is correspondingly installed on the remaining X-axis linear mechanisms. Each first spray gun is horizontally positioned and faces the powder spraying line accumulation chain. The first and second spray guns are arranged in a row at intervals from top to bottom. When the cylinder is stopped at the powder spraying station, the nozzle of the second spray gun is below the cylinder and faces the bottom surface of the cylinder. Powder spraying is performed with the nozzles of each first spray gun located on one side of the cylinder body and spraying powder towards the cylinder barrel surface. The lowest X-axis linear mechanism drives the second spray gun to reciprocate along the X-axis and controls the distance and speed of the second spray gun along the X-axis. The remaining X-axis linear mechanisms independently drive each first spray gun to move along the X-axis and control the distance of each first spray gun from the cylinder body surface. The Z-axis linear mechanism, which is located at the lowest X-axis linear mechanism, drives the second spray gun to move along the Z-axis and controls the height of the second spray gun. The remaining Z-axis linear mechanisms independently drive each first spray gun to reciprocate along the Z-axis and control the vertical spacing, vertical distance, and vertical speed of each first spray gun. The Y-axis linear mechanism drives the slide to move each first spray gun and the second spray gun along the Y-axis, allowing each first spray gun to switch between two positions: facing the cylinder barrel surface and facing the gap between the liquid pipe and the cylinder body.

[0023] Based on the above, the specific powder coating parameters are as follows:

[0024] The distance M between each of the first spray guns and the cylinder surface is M = D / 2 + 250, where D is the outer diameter of the cylinder in mm. This parameter includes two cases: First, when the reciprocating automatic powder spraying mechanism sprays powder towards the gap between the liquid pipe and the cylinder, each of the first spray guns is positioned towards the gap between the liquid pipe and the cylinder, and this parameter refers to the distance between each of the first spray guns and the plane containing the center of the liquid pipe and the cylinder. Second, when the reciprocating automatic powder spraying mechanism sprays powder towards the cylinder surface, each of the first spray guns is positioned towards the cylinder barrel surface, and this parameter refers to the distance between each of the first spray guns and the cylinder barrel surface.

[0025] The vertical spacing H between each of the first spray guns is (L1 + 100 * 2) / (Q - 1), where L1 is the cylinder length in mm and Q is the number of the first spray guns.

[0026] The vertical movement distance S of each of the first spray guns is S = HP * (1 - W), where P is the spray width of the first spray gun and W is the overlap rate of the spraying during the vertical reciprocating motion of the first spray gun.

[0027] The second spray gun moves a distance Lx along the X-axis = D / 2 + 100;

[0028] Cylinder rotational linear velocity Va:

[0029]

[0030] Where N is the number of cylinder rotations, and k is the powder spraying capacity of the first spray gun, in m2 / min;

[0031] The vertical movement speed Vz of the first spray gun:

[0032]

[0033] Wherein, P is the spray width of the first spray gun, and W is the spray overlap rate of the first spray gun in its up-and-down reciprocating motion.

[0034] The second spray gun moves at a speed Vx along the X-axis:

[0035]

[0036] Based on the above, step S1 specifically involves: tightening and assembling a cylinder plug into the cylinder opening of the cylinder to be sprayed with powder; hooking the lower end hook of a lifting rod onto the lifting lug on the cylinder plug; and finally, vertically suspending the cylinder on the hanging ring at the lower end of a corresponding rotating rod via the lifting rod, thereby vertically suspending the cylinder to be sprayed with powder on a corresponding rotating hanger on the powder spraying line accumulation chain.

[0037] Based on the above, step S2 is specifically as follows: the trolley group of the powder spraying line accumulation chain drives the cylinder to move through the rotating hanger and the boom, so that the cylinder passes through the grating chamber and between the two laser gratings. The two laser gratings calculate the outer diameter and length of the cylinder based on the laser reflection distance, and send the outer diameter and length of the cylinder to the control system.

[0038] Based on the above, step S4 specifically involves: when the powder spraying line accumulation chain drives the cylinder into the powder spraying station within the spray booth, the cylinder stops at the powder spraying station. At this time, the drive gear meshes with the driven gear of the rotating hanger stopped at the powder spraying station. The control system controls the drive motor to rotate, causing the drive gear to drive the driven gear to rotate, thereby causing the rotating rod to drive the cylinder to rotate until the liquid pipe on the cylinder is aligned with the conveying direction of the powder spraying line accumulation chain. The drive motor then stops, and the cylinder remains stationary. Finally, the control system controls the Y-axis linear mechanism to drive the slide block to move each of the first spray guns and... The second spray gun moves along the Y-axis, causing each of the first spray guns to move from a position facing the cylinder surface to a position facing the gap between the liquid pipe and the cylinder. The control system adjusts the distance between each of the first spray guns and the plane containing the center of the liquid pipe and the cylinder according to the powder spraying parameters. Then, each of the first spray guns is turned on and controlled to move up and down reciprocally, so that each of the first spray guns sprays powder towards the gap between the liquid pipe and the cylinder. The control system also controls the vertical spacing, vertical movement distance, and vertical movement speed of each of the first spray guns according to the powder spraying parameters. During this process, the second spray gun is turned off.

[0039] Based on the above, step S5 specifically involves: after powder spraying is completed at the gap between the liquid pipe and the cylinder body, the control system controls the Y-axis linear mechanism to drive the slide block to move and reset each of the first and second spray guns in the opposite direction along the Y-axis, so that each of the first spray guns moves from a position facing the gap between the liquid pipe and the cylinder body to a position facing the cylinder surface of the cylinder body. At this time, the second spray gun is located directly below the cylinder body. Then, the control system controls the drive motor to rotate, and the drive motor drives the rotating rod to rotate through the meshing transmission of the driving gear and the driven gear, thereby causing the rotating rod to drive the cylinder body to rotate through the suspension rod. The control system adjusts the powder spraying parameters... The control system adjusts the rotational speed of the drive motor to achieve a set value, and also adjusts the distance between each of the first spray guns and the cylinder surface of the cylinder according to the powder spraying parameters. Then, each of the first spray guns is opened and controlled to move up and down reciprocally, while the second spray gun is opened and controlled to move reciprocally along the X-axis. Thus, each of the first spray guns sprays powder toward the cylinder surface of the cylinder, and the second spray gun sprays powder toward the cylinder bottom surface. The control system also controls the vertical spacing, vertical movement distance, and vertical movement speed of each of the first spray guns according to the powder spraying parameters, and simultaneously controls the vertical movement distance and movement speed of the second spray gun along the X-axis.

[0040] This invention has outstanding substantive features and significant progress compared to the prior art. Specifically, this invention has the following advantages:

[0041] (1) The present invention can automatically adjust the powder spraying parameters according to the outer diameter and length of the cylinder, so that each cylinder with an outer diameter and length can be matched with its own powder spraying parameters, ensuring that the coating thickness of all cylinders after powder spraying is uniform and the coating quality is high.

[0042] (2) The present invention optimizes the powder spraying method. During powder spraying, the cylinder no longer moves forward and rotates at the same time, and the reciprocating machine no longer moves forward with the cylinder. Instead, the cylinder stops at the powder spraying station in the spraying chamber and rotates by the automatic rotation mechanism of the cylinder. The automatic powder spraying mechanism of the reciprocating machine is set on one side of the powder spraying station and sprays powder towards the cylinder. Furthermore, the automatic powder spraying mechanism of the reciprocating machine first sprays powder at the gap between the liquid pipe and the cylinder, and then sprays powder on the surface of the cylinder, ensuring that there is no exposed bottom below the liquid pipe. This eliminates the need for manual touch-up spraying and realizes fully automatic powder spraying operation with high efficiency. It also avoids the mismatch between the forward speed of the reciprocating machine and the forward speed of the cylinder that occurs in the existing powder spraying method, thus avoiding uneven coating thickness of the cylinder. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the cylinder block.

[0044] Figure 2 This is a schematic diagram of the powder spraying line arrangement of the hydraulic support cylinder body of the present invention.

[0045] Figure 3 This is a schematic diagram of the automatic cylinder rotation mechanism of the present invention.

[0046] Figure 4 This is a side view of the automatic powder spraying mechanism of the reciprocating machine of the present invention.

[0047] Figure 5 This is a top view of the automatic powder spraying mechanism for the reciprocating machine of the present invention.

[0048] In the diagram: 1. Liquid inlet pipe; 2. Cylinder body; 3. Powder spraying line accumulation chain; 4. Spray booth; 5. Trolley assembly; 6. Laser grating; 7. Grating chamber; 8. Rotating rod; 9. Driven gear; 10. Hanging ring; 11. Cylinder port plug; 12. Lifting lug; 13. Lifting rod; 14. Drive motor; 15. Drive gear; 16. First spray gun; 17. Second spray gun; 18. Slide; 19. Base; 20. Z-axis linear mechanism; 21. X-axis linear mechanism; 22. Reciprocating automatic powder spraying mechanism. Detailed Implementation

[0049] The technical solution of the present invention will be further described in detail below through specific embodiments.

[0050] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, an automatic powder coating method for hydraulic support cylinder bodies is disclosed, which performs powder coating operations via a powder coating line for the hydraulic support cylinder bodies. This powder coating line includes a powder coating line accumulation chain 3, a spray chamber 4, an automatic grating recognition mechanism, an automatic cylinder body rotation mechanism, a reciprocating automatic powder coating mechanism 22, and a control system. The powder coating line accumulation chain 3 passes through the spray chamber 4 from front to back. A rotating hanger for suspending the cylinder body 2 is installed on the trolley group 5 of the powder coating line accumulation chain 3. The automatic grating recognition mechanism is located at the entrance of the spray chamber 4 to automatically identify the size of the passing cylinder body 2 and send it to the control system. The control system includes an automatic cylinder rotation mechanism and an automatic reciprocating powder spraying mechanism 22, both located at the powder spraying station within the spray booth 4 and on the left and right sides of the powder spraying line accumulation chain 3. The automatic cylinder rotation mechanism can drive the rotating hanger stopped at the powder spraying station to rotate the cylinder 2. The automatic reciprocating powder spraying mechanism 22 can spray powder onto the cylinder 2 stopped at the powder spraying station. The control system controls the operation of the powder spraying line accumulation chain 3, the automatic cylinder rotation mechanism, and the automatic reciprocating powder spraying mechanism 22 according to the cylinder size identified by the automatic grating recognition mechanism.

[0051] Specifically, the following steps are included:

[0052] S1. The cylinder body 2 to be sprayed with powder is vertically suspended on one of the corresponding rotating hangers on the powder spraying line accumulation chain 3;

[0053] S2. The powder spraying line accumulation chain 3 drives the cylinder 2 through the grating automatic recognition mechanism. The grating automatic recognition mechanism identifies the cylinder size and sends the identified cylinder size to the control system. The cylinder size includes the outer diameter and length of the cylinder 2.

[0054] S3. The control system compares the cylinder size identified by the grating automatic recognition mechanism with the cylinder size stored in the database to accurately determine the structure and size of the cylinder 2. The control system automatically adjusts the cycle time and powder spraying parameters of the powder spraying line accumulation chain 3 according to the structure and size of the cylinder 2 to ensure that the coating thickness is uniform. The powder spraying parameters include the cylinder rotation linear speed and the working parameters of the reciprocating automatic powder spraying mechanism 22.

[0055] S4. When the powder spraying line accumulation chain 3 drives the cylinder 2 into the powder spraying station in the spraying chamber 4, the cylinder 2 is stopped at the powder spraying station. The cylinder automatic rotation mechanism drives the rotating hanger to rotate the cylinder 2, so that the liquid pipe 1 on the cylinder 2 is aligned with the conveying direction of the powder spraying line accumulation chain 3. Then, the cylinder automatic rotation mechanism stops, so that the cylinder 2 remains stationary. The control system controls the reciprocating automatic powder spraying mechanism 22 to spray powder into the gap between the liquid pipe 1 and the cylinder 2 according to the powder spraying parameters.

[0056] S5. After the powder spraying is completed in the gap between the liquid pipe 1 and the cylinder 2, the control system controls the cylinder automatic rotation mechanism to drive the rotating hanger to start rotating the cylinder 2 according to the powder spraying parameters, and at the same time controls the reciprocating automatic powder spraying mechanism 22 to spray powder toward the surface of the cylinder 2.

[0057] S6. After the powder coating is completed, the automatic rotation mechanism of the cylinder body stops driving, the reciprocating automatic powder coating mechanism 22 stops powder coating and resets, and at the same time, the powder coating line accumulation chain 3 drives the cylinder body 2 to continue moving, so that the powder-coated cylinder body 2 is conveyed out from the outlet of the spray booth 4 and moved to the next process.

[0058] Repeat steps S1 to S6 to spray powder onto all cylinder blocks 2 one by one.

[0059] The automatic grating recognition mechanism includes two laser gratings 6. A grating chamber 7 is provided on the front side of the entrance of the spray booth 4. The powder spraying line accumulation chain 3 passes through the grating chamber 7 from front to back. The two laser gratings 6 are symmetrically arranged on both sides of the powder spraying line accumulation chain 3 and are respectively installed in the grating chamber 7. The control system is signal connected to the two laser gratings 6.

[0060] The rotating hoist includes a rotating rod 8, the upper end of which is rotatably mounted on the trolley group 5 of the powder spraying line accumulation chain 3. A driven gear 9 is coaxially fixed on the outer circumference of the rotating rod 8, and a hanging ring 10 is provided at the lower end of the rotating rod 8. When suspending the cylinder body 2, a cylinder port plug 11 is pre-tightly fitted in the cylinder port of the cylinder body 2. A lifting lug 12 is provided on the cylinder port plug 11. The lifting lug 12 is connected to the hanging ring 10 through a lifting rod 13 with hooks at both ends, so that the cylinder body 2 can be vertically suspended on the hanging ring 10.

[0061] The cylinder automatic rotation mechanism includes a drive motor 14 and a drive gear 15. The drive motor 14 is vertically installed in the powder spraying station inside the spray booth 4 via a bracket and is at the same height as the powder spraying line accumulation chain 3. The drive motor 14 is located on the left or right side of the powder spraying line accumulation chain 3. The drive gear 15 is fixedly installed at the lower end of the motor shaft of the drive motor 14 and can mesh with the driven gear 9 of the rotating hanger stopped at the powder spraying station. The control system controls the rotation of the drive motor 14. The control system also controls the rotation speed of the drive motor 14 according to the powder spraying parameters, thereby controlling the linear speed of the cylinder rotation.

[0062] The reciprocating automatic powder spraying mechanism 22 includes several first spray guns 16, second spray guns 17, slides 18, and bases 19. The horizontal direction is defined as the X-axis, the horizontal direction as the Y-axis, and the vertical direction as the Z-axis. The slides 18 can move along the Y-axis on the base 19 via Y-axis linear mechanisms. The base 19 is fixedly installed on the ground to the left or right of the powder spraying station within the spray booth 4. A row of Z-axis linear mechanisms 20 arranged at left-right intervals is provided on the slides 18. Each Z-axis linear mechanism 20 has an X-axis linear mechanism 21 on its slider. The X-axis linear mechanisms 21 are arranged vertically at intervals; the second spray gun 17 is installed on the lowest X-axis linear mechanism 21, and the nozzle of the second spray gun 17 is bent upwards. Each of the first spray guns 16 is installed on the remaining X-axis linear mechanisms 21 respectively. Each of the first spray guns 16 is horizontally arranged and faces the powder coating line accumulation chain 3. The first spray guns 16 and the second spray guns 17 are arranged in a row from top to bottom at intervals. When the cylinder body 2 is stopped at the powder coating station, the nozzle of the second spray gun 17 is located below the cylinder body 2 and faces the bottom surface of the cylinder body 2. Powder spraying is performed, with the nozzles of each of the first spray guns 16 located on one side of the cylinder body 2 and facing the cylinder barrel surface of the cylinder body 2; the lowest X-axis linear mechanism 21 drives the second spray gun 17 to reciprocate along the X-axis and controls the moving distance and speed of the second spray gun 17 along the X-axis; the remaining X-axis linear mechanisms 21 independently drive each of the first spray guns 16 to move along the X-axis and control the distance of each of the first spray guns 16 from the surface of the cylinder body 2; the Z-axis linear mechanism 20, which is located at the lowest X-axis linear mechanism 21, drives the second... The spray gun 17 moves along the Z-axis and controls the height of the second spray gun 17. The remaining Z-axis linear mechanisms 20 independently drive each of the first spray guns 16 to reciprocate along the Z-axis and control the vertical spacing, vertical movement distance, and vertical movement speed of each of the first spray guns 16. The Y-axis linear mechanism, by driving the slide block 18, can move each of the first spray guns 16 and the second spray gun 17 along the Y-axis, allowing each of the first spray guns 16 to switch between two positions: one facing the cylinder surface of the cylinder body 2 and the other facing the gap between the liquid pipe 1 and the cylinder body 2. Figure 2 and Figure 5 The first position marked in the diagram is the position of each of the first spray guns 16 facing the cylinder surface of the cylinder body 2, and the second position is the position of each of the first spray guns 16 facing the gap between the liquid pipe 1 and the cylinder body 2.

[0063] The specific powder coating parameters are as follows:

[0064] The distance M between each of the first spray guns 16 and the surface of the cylinder body 2 is M = D / 2 + 250, where D is the outer diameter of the cylinder body in mm. This parameter includes two cases: First, when the reciprocating automatic powder spraying mechanism 22 sprays powder towards the gap between the liquid pipe 1 and the cylinder body 2, each of the first spray guns 16 is positioned towards the gap between the liquid pipe 1 and the cylinder body 2, and this parameter refers to the distance between each of the first spray guns 16 and the plane containing the center of the liquid pipe 1 and the cylinder body 2; Second, when the reciprocating automatic powder spraying mechanism 22 sprays powder towards the surface of the cylinder body 2, each of the first spray guns 16 is positioned towards the cylinder barrel surface of the cylinder body 2, and this parameter refers to the distance between each of the first spray guns 16 and the cylinder barrel surface of the cylinder body 2.

[0065] The vertical spacing H of each of the first spray guns 16 is (L1+100*2) / (Q-1), where L1 is the cylinder length in mm and Q is the number of the first spray guns.

[0066] The vertical movement distance S of each of the first spray guns 16 is S = HP * (1 - W), where P is the spray width of the first spray gun 16 and W is the spray overlap rate of the first spray gun 16 in its vertical reciprocating motion.

[0067] The second spray gun 17 moves a distance Lx along the X-axis = D / 2 + 100;

[0068] Cylinder rotational linear velocity Va:

[0069]

[0070] Where N is the number of cylinder rotations, and k is the powder spraying capacity of the first spray gun 16, in m2 / min;

[0071] The vertical movement speed Vz of the first spray gun 16:

[0072]

[0073] Wherein, P is the spray width of the first spray gun 16, and W is the spray overlap rate of the first spray gun 16 in its up-and-down reciprocating motion.

[0074] The second spray gun 17 moves at a speed Vx along the X-axis:

[0075]

[0076] By setting the above powder coating parameters, each cylinder can be matched with the corresponding powder coating parameters according to its own outer diameter and length dimensions, ensuring that the coating thickness of all cylinders after powder coating is uniform and of high quality.

[0077] Step S1 specifically involves: tightening and assembling a cylinder plug 11 into the cylinder opening of the cylinder body 2 to be sprayed with powder; hooking the lower end hook of a lifting rod 13 onto the lifting lug 12 on the cylinder plug 11; and finally, vertically suspending the cylinder body 2 on the hanging ring 10 at the lower end of a corresponding rotating rod 8 via the lifting rod 13, thereby vertically suspending the cylinder body 2 to be sprayed with powder on a corresponding rotating hanger on the powder spraying line accumulation chain 3.

[0078] Step S2 is as follows: The trolley group 5 of the powder spraying line accumulation chain 3 drives the cylinder 2 to move through the rotating hanger and the lifting rod 13, so that the cylinder 2 passes through the grating chamber 7 and between the two laser gratings 6. The two laser gratings 6 calculate the outer diameter and length of the cylinder 2 according to the laser reflection distance, and send the outer diameter and length of the cylinder 2 to the control system.

[0079] Step S4 is as follows: When the powder spraying line accumulation chain 3 drives the cylinder 2 into the powder spraying station in the spray booth 4, the cylinder 2 is stopped at the powder spraying station. At this time, the drive gear 15 meshes with the driven gear 9 of the rotating hanger stopped at the powder spraying station. The control system controls the drive motor 14 to rotate, causing the drive gear 15 to drive the driven gear 9 to rotate, thereby causing the rotating rod 8 to drive the cylinder 2 to rotate until the liquid pipe 1 on the cylinder 2 is aligned with the conveying direction of the powder spraying line accumulation chain 3. The drive motor 14 stops, and the cylinder 2 remains stationary. Then, the control system controls the Y-axis linear mechanism to drive the slide 18 to drive each of the first spray guns 16 and the first... The two spray guns 17 move along the Y-axis, causing each of the first spray guns 16 to move from a position facing the cylinder surface of the cylinder body 2 to a position facing the gap between the liquid pipe 1 and the cylinder body 2. The control system adjusts the distance of each of the first spray guns 16 from the plane where the center of the liquid pipe 1 and the cylinder body 2 are located according to the powder spraying parameters. Then, each of the first spray guns 16 is turned on and controlled to move up and down reciprocally, so that each of the first spray guns 16 sprays powder towards the gap between the liquid pipe 1 and the cylinder body 2. The control system also controls the vertical spacing, vertical movement distance and vertical movement speed of each of the first spray guns 16 according to the powder spraying parameters. During this process, the second spray gun 17 is turned off.

[0080] Step S5 specifically involves: After powder spraying is completed at the gap between the liquid pipe 1 and the cylinder 2, the control system controls the Y-axis linear mechanism to drive the slide block 18, causing each of the first spray guns 16 and the second spray guns 17 to move in the opposite direction along the Y-axis and reset, so that each of the first spray guns 16 moves from a position facing the gap between the liquid pipe 1 and the cylinder 2 to a position facing the cylinder surface of the cylinder 2. At this time, the second spray gun 17 is located directly below the cylinder 2. Then, the control system controls the drive motor 14 to rotate. The drive motor 14 drives the rotating rod 8 to rotate through the meshing transmission of the driving gear 15 and the driven gear 9, thereby causing the rotating rod 8 to drive the cylinder 2 to rotate through the hanging rod 13. The control system adjusts the powder spraying parameters accordingly. The control system adjusts the rotational speed of the drive motor 14 to achieve a set value, and also adjusts the distance between each of the first spray guns 16 and the cylinder surface of the cylinder 2 according to the powder spraying parameters. Then, each of the first spray guns 16 is opened and controlled to move up and down reciprocally, while the second spray gun 17 is opened and controlled to move reciprocally along the X-axis. Thus, each of the first spray guns 16 sprays powder toward the cylinder surface of the cylinder 2, and the second spray gun 17 sprays powder toward the bottom surface of the cylinder 2. The control system also controls the vertical spacing, vertical movement distance, and vertical movement speed of each of the first spray guns 16 according to the powder spraying parameters, and simultaneously controls the vertical movement distance and movement speed of the second spray gun 17 along the X-axis.

[0081] As can be seen from the above, the present invention has the following advantages:

[0082] (1) The present invention can automatically adjust the powder spraying parameters according to the outer diameter and length of the cylinder 2, so that each cylinder 2 with an outer diameter and length can be matched with its own powder spraying parameters, ensuring that the coating thickness of all cylinders 2 after powder spraying is uniform and the coating quality is high.

[0083] (2) The present invention optimizes the powder spraying method. During powder spraying, the cylinder 2 no longer moves forward and rotates at the same time, and the reciprocating machine no longer moves forward with the cylinder 2. Instead, the cylinder 2 stops at the powder spraying station in the spraying chamber 4 and rotates by the automatic rotation mechanism of the cylinder. The automatic powder spraying mechanism 22 of the reciprocating machine is set on one side of the powder spraying station and sprays powder towards the cylinder 2. Furthermore, the automatic powder spraying mechanism 22 of the reciprocating machine first sprays powder at the gap between the liquid pipe 1 and the cylinder 2, and then sprays powder on the surface of the cylinder 2 to ensure that there is no exposed bottom below the liquid pipe 1. This eliminates the need for manual re-spraying and realizes fully automatic powder spraying operation with high efficiency. It also avoids the mismatch between the forward speed of the reciprocating machine and the forward speed of the cylinder in the existing powder spraying method, thus avoiding uneven coating thickness of the cylinder.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. An automatic powder spraying method for the cylinder body of a hydraulic support, characterized in that: Powder coating operations are performed via a hydraulic support cylinder powder coating line. This line includes a powder coating line accumulation chain, a spray booth, an automatic grating recognition mechanism, an automatic cylinder rotation mechanism, a reciprocating automatic powder coating mechanism, and a control system. The powder coating line accumulation chain passes through the spray booth from front to back. A rotating hanger for suspending the cylinder is mounted on the trolley assembly of the powder coating line accumulation chain. The automatic grating recognition mechanism is located at the entrance of the spray booth to automatically identify the size of passing cylinders and send this information to the control system. The cylinder... The rotating mechanism and the reciprocating automatic powder spraying mechanism are both installed at the powder spraying station in the spraying chamber and are located on the left and right sides of the powder spraying line accumulation chain, respectively. The cylinder automatic rotating mechanism can drive the rotating hanger stopped at the powder spraying station to rotate the cylinder. The reciprocating automatic powder spraying mechanism can spray powder toward the cylinder stopped at the powder spraying station. The control system controls the operation of the powder spraying line accumulation chain, the cylinder automatic rotating mechanism and the reciprocating automatic powder spraying mechanism according to the cylinder size identified by the grating automatic recognition mechanism. Specifically, the following steps are included: S1. The cylinder body to be sprayed with powder is vertically suspended on one of the corresponding rotating hangers on the powder spraying line accumulation chain; S2. The powder spraying line accumulation chain drives the cylinder through the grating automatic recognition mechanism, which identifies the cylinder size and sends the identified cylinder size to the control system. The cylinder size includes the outer diameter and length of the cylinder. S3. The control system compares the cylinder size identified by the grating automatic recognition mechanism with the cylinder size stored in the database to accurately determine the cylinder structure and size. The control system automatically adjusts the cycle time and powder spraying parameters of the powder spraying line accumulation chain according to the cylinder structure and size to ensure uniform coating thickness. The powder spraying parameters include the cylinder rotation linear speed and the working parameters of the reciprocating automatic powder spraying mechanism. S4. When the powder spraying line accumulation chain drives the cylinder into the powder spraying station in the spraying chamber, the cylinder stops at the powder spraying station. The cylinder automatic rotation mechanism drives the rotating hanger to rotate the cylinder so that the liquid pipe on the cylinder is aligned with the conveying direction of the powder spraying line accumulation chain. Then, the cylinder automatic rotation mechanism stops, keeping the cylinder stationary. The control system controls the reciprocating automatic powder spraying mechanism to spray powder into the gap between the liquid pipe and the cylinder according to the powder spraying parameters. S5. After the powder spraying is completed in the gap between the liquid pipe and the cylinder, the control system controls the cylinder automatic rotation mechanism to drive the rotating hanger to start rotating the cylinder according to the powder spraying parameters, and at the same time controls the reciprocating automatic powder spraying mechanism to spray powder toward the cylinder surface. S6. After the powder coating is completed, the automatic rotation mechanism of the cylinder stops driving, the automatic powder coating mechanism of the reciprocating machine stops powder coating and resets, and at the same time, the powder coating line accumulation chain drives the cylinder to continue moving, so that the powder-coated cylinder is conveyed out from the outlet of the spray booth and moved to the next process. Repeat steps S1 to S6 to spray powder onto all cylinder blocks one by one.

2. The automatic powder spraying method for the cylinder body of the hydraulic support as described in claim 1, characterized in that: The automatic grating recognition mechanism includes two laser gratings. A grating chamber is provided at the front of the entrance of the spray booth. The powder spraying line accumulation chain passes through the grating chamber from front to back. The two laser gratings are symmetrically arranged on both sides of the powder spraying line accumulation chain and are respectively installed in the grating chamber. The control system is signal-connected to the two laser gratings.

3. The automatic powder spraying method for the cylinder body of the hydraulic support according to claim 2, characterized in that: The rotating hoist includes a rotating rod, the upper end of which is rotatably mounted on the trolley assembly of the powder spraying line accumulation chain. A driven gear is coaxially fixed on the outer circumference of the rotating rod, and a hanging ring is provided at the lower end of the rotating rod. When suspending the cylinder body, a cylinder port plug is pre-tightly fitted in the cylinder port of the cylinder body. A lifting lug is provided on the cylinder port plug. The lifting lug is connected to the hanging ring through a lifting rod with hooks at both ends, thereby allowing the cylinder body to be vertically suspended on the hanging ring.

4. The automatic powder spraying method for the cylinder body of the hydraulic support according to claim 3, characterized in that: The cylinder automatic rotation mechanism includes a drive motor and a drive gear. The drive motor is vertically mounted on the powder spraying station inside the spray booth via a bracket and is at the same height as the powder spraying line accumulation chain. The drive motor is located on the left or right side of the powder spraying line accumulation chain. The drive gear is fixedly mounted on the lower end of the motor shaft of the drive motor and can mesh with the driven gear of the rotating hanger stopped at the powder spraying station. The control system controls the rotation of the drive motor and also controls the speed of the drive motor according to the powder spraying parameters, thereby controlling the linear speed of the cylinder rotation.

5. The automatic powder spraying method for the cylinder body of the hydraulic support according to claim 4, characterized in that: The reciprocating automatic powder spraying mechanism includes several first spray guns, second spray guns, slides, and a base. The horizontal direction is defined as the X-axis, the horizontal direction as the Y-axis, and the vertical direction as the Z-axis. The slide can move along the Y-axis on the base via a Y-axis linear mechanism. The base is fixedly installed on the ground to the left or right of the powder spraying station within the spray booth. A row of Z-axis linear mechanisms is arranged at intervals on the slide. Each Z-axis linear mechanism has an X-axis linear mechanism on its slider, and these X-axis linear mechanisms are arranged at intervals vertically. The second spray gun is installed on the lowest X-axis linear mechanism, with its nozzle bent upwards. Each first spray gun is correspondingly installed on the remaining X-axis linear mechanisms. Each first spray gun is horizontally positioned and faces the powder spraying line accumulation chain. The first and second spray guns are arranged in a row at intervals from top to bottom. When the cylinder is stopped at the powder spraying station, the nozzle of the second spray gun is below the cylinder and sprays towards the bottom surface of the cylinder. The powder is sprayed from the nozzles of each of the first spray guns, which are located on one side of the cylinder body and face the cylinder barrel surface. The lowest X-axis linear mechanism drives the second spray gun to move back and forth along the X-axis and controls the moving distance and speed of the second spray gun along the X-axis. The remaining X-axis linear mechanisms independently drive each of the first spray guns to move along the X-axis and control the distance of each of the first spray guns from the cylinder body surface. The Z-axis linear mechanism, which is located at the lowest X-axis linear mechanism, drives the second spray gun to move along the Z-axis and controls the height of the second spray gun. The remaining Z-axis linear mechanisms independently drive each of the first spray guns to move back and forth along the Z-axis and control the vertical spacing, vertical moving distance, and vertical moving speed of each of the first spray guns. The Y-axis linear mechanism drives the slide to move each of the first and second spray guns along the Y-axis, allowing each of the first spray guns to switch between two positions: facing the cylinder barrel surface and facing the gap between the liquid pipe and the cylinder body.

6. The automatic powder spraying method for the cylinder body of a hydraulic support according to claim 5, characterized in that: The specific powder coating parameters are as follows: The distance M between each of the first spray guns and the cylinder surface is M = D / 2 + 250, where D is the outer diameter of the cylinder in mm. This parameter includes two cases: First, when the reciprocating automatic powder spraying mechanism sprays powder towards the gap between the liquid pipe and the cylinder, each of the first spray guns is positioned towards the gap between the liquid pipe and the cylinder, and this parameter refers to the distance between each of the first spray guns and the plane containing the center of the liquid pipe and the cylinder. Second, when the reciprocating automatic powder spraying mechanism sprays powder towards the cylinder surface, each of the first spray guns is positioned towards the cylinder barrel surface, and this parameter refers to the distance between each of the first spray guns and the cylinder barrel surface. The vertical spacing H between each of the first spray guns is (L1 + 100 * 2) / (Q - 1), where L1 is the cylinder length in mm and Q is the number of the first spray guns. The vertical movement distance S of each of the first spray guns is S = HP * (1 - W), where P is the spray width of the first spray gun and W is the overlap rate of the spraying during the vertical reciprocating motion of the first spray gun. The second spray gun moves a distance Lx along the X-axis = D / 2 + 100; Cylinder rotational linear velocity Va, in m / min: Where N is the number of cylinder rotations, and k is the powder spraying capacity of the first spray gun, in m2 / min; The vertical movement speed Vz of the first spray gun: Wherein, P is the spray width of the first spray gun, and W is the spray overlap rate of the first spray gun in its up-and-down reciprocating motion. The second spray gun moves at a speed Vx along the X-axis, in m / min:

7. The automatic powder spraying method for the cylinder body of a hydraulic support according to claim 6, characterized in that: Step S1 specifically involves: tightening and assembling a cylinder plug into the cylinder opening of the cylinder to be sprayed with powder; hooking the lower end hook of a lifting rod onto the lifting lug on the cylinder plug; and finally, vertically suspending the cylinder on the hanging ring at the lower end of a corresponding rotating rod via the lifting rod, thereby vertically suspending the cylinder to be sprayed with powder on a corresponding rotating hanger on the powder spraying line accumulation chain.

8. The automatic powder spraying method for the cylinder body of a hydraulic support according to claim 6, characterized in that: Step S2 is as follows: The trolley group of the powder spraying line accumulation chain drives the cylinder to move through the rotating hanger and the boom, so that the cylinder passes through the grating chamber and between the two laser gratings. The two laser gratings calculate the outer diameter and length of the cylinder based on the laser reflection distance, and send the outer diameter and length of the cylinder to the control system.

9. The automatic powder spraying method for the cylinder body of a hydraulic support according to claim 6, characterized in that: Step S4 specifically involves: when the powder coating line accumulation chain drives the cylinder into the powder coating station within the spray booth, the cylinder stops at the powder coating station. At this time, the drive gear meshes with the driven gear of the rotating hanger stopped at the powder coating station. The control system controls the drive motor to rotate, causing the drive gear to drive the driven gear to rotate, which in turn causes the rotating rod to drive the cylinder to rotate until the liquid pipe on the cylinder is aligned with the conveying direction of the powder coating line accumulation chain. The drive motor then stops, and the cylinder remains stationary. Finally, the control system controls the Y-axis linear mechanism to drive the slide to move each of the first spray guns and the first... The two spray guns move along the Y-axis, moving each of the first spray guns from a position facing the cylinder surface to a position facing the gap between the liquid pipe and the cylinder. The control system adjusts the distance of each of the first spray guns from the plane containing the liquid pipe and the center of the cylinder according to the powder spraying parameters. Then, each of the first spray guns is turned on and controlled to move up and down reciprocally, so that each of the first spray guns sprays powder towards the gap between the liquid pipe and the cylinder. The control system also controls the vertical spacing, vertical movement distance, and vertical movement speed of each of the first spray guns according to the powder spraying parameters. During this process, the second spray gun is turned off.

10. The automatic powder spraying method for the cylinder body of a hydraulic support according to claim 6, characterized in that: Step S5 specifically involves: After powder spraying is completed at the gap between the liquid pipe and the cylinder body, the control system controls the Y-axis linear mechanism to drive the slide block, causing each of the first and second spray guns to move in the opposite direction along the Y-axis and reset, so that each of the first spray guns moves from a position facing the gap between the liquid pipe and the cylinder body to a position facing the cylinder surface of the cylinder body. At this time, the second spray gun is located directly below the cylinder body. Then, the control system controls the drive motor to rotate, and the drive motor drives the rotating rod to rotate through the meshing of the driving gear and the driven gear, thereby causing the rotating rod to drive the cylinder body to rotate through the suspension rod. The control system adjusts the drive motor according to the powder spraying parameters. The control system adjusts the rotational speed of the cylinder to a set value by adjusting the speed of the motor and the linear velocity of the cylinder body. It also adjusts the distance between each of the first spray guns and the cylinder surface based on the powder spraying parameters. Then, it opens each of the first spray guns and controls their reciprocating up-and-down movement, while simultaneously opening the second spray guns and controlling their reciprocating movement along the X-axis. Thus, each of the first spray guns sprays powder towards the cylinder surface, and the second spray gun sprays powder towards the cylinder bottom surface. Furthermore, the control system controls the vertical spacing, vertical movement distance, and vertical movement speed of each of the first spray guns based on the powder spraying parameters, while simultaneously controlling the vertical movement distance and speed of the second spray gun along the X-axis.

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