Heat exchanger tube spraying equipment

Abstract

The present invention relates to the technical field of coating process, in particular to heat exchanger tube spraying equipment, including a workpiece placement mechanism, on which the heat exchanger tube to be sprayed is placed, and a running rail fixed to the ground at intervals is provided on the rear side of the workpiece placement mechanism, a front feeding unit is fixedly installed at the front end of the running rail, and a rear feeding unit is cooperatively installed at the rear end of the running rail, and a spray pipe group is cooperatively installed between the front feeding unit and the rear feeding unit, and the front end of the spray pipe group is movable through the front feeding unit. The heat exchanger tube spraying equipment of the present invention adopts the method of in-tube spraying, which greatly reduces the waste of paint, saves paint, and reduces production costs; the heat exchanger tube spraying equipment is in a horizontal state during the entire spraying process, and is highly safe; the overall equipment of the present invention has a high degree of mechanization, simple operation, and low labor costs.

Description

Technical Field

[0001] The present invention relates to the technical field of coating technology, and in particular to a new heat exchange tube in-tube spraying device capable of reducing coating waste, saving coating, and lowering production costs, especially a heat exchanger tube in-tube spraying device. Background Art

[0002] As a key component of the heat exchanger, the inner tube of the heat exchanger generally needs to be sprayed with a coating on its inner wall during the production process to achieve anti-corrosion and other effects.

[0003] Currently, there are some devices and equipment in the prior art for spraying the inner tubes of large heat exchangers. For example, patent publication number CN212284707U discloses an anti-corrosion coating device for the inner tubes of large heat exchangers. Its main structure includes a track with a support vehicle provided above one end of the track; a fourth drive motor provided on one side of the sliding mounting block, one end of the fourth drive motor fixedly mounted to the side wall of the sliding mounting block, the output shaft of the fourth drive motor being in transmission connection with the upper end of the second hydraulic cylinder; a fifth drive motor provided on one side of the lower end of the second hydraulic cylinder, one end of the fifth drive motor fixedly mounted to the side wall of the second hydraulic cylinder, the output shaft of the fifth drive motor being in transmission connection with one end of a short robotic arm.

[0004] It can be seen from the records of the above-mentioned prior art patent that the above-mentioned device adopts the filling and coating principle to paint the inner surface of the heat exchanger, which can easily cause huge waste of paint, and due to air resistance during the filling and coating process, the coating effect inside the tube cannot be guaranteed. During the coating process, the process is cumbersome and the operation is complicated, and the heat exchanger needs to be at a certain angle, which has low safety.

[0005] In addition, for example, in the patent document with patent publication number CN210449645U, an epoxy resin coated composite steel pipe internal spraying device is also disclosed, whose main structure includes a limit block, a pipe ring, a third electric push rod and a base, characterized in that: a second electric push rod is installed at the top of the base, and a lifting frame is installed at the top of the base at one end of the second electric push rod, a mounting seat is installed at the top of the lifting frame, a first fixed tube is installed at the top of the limit block, a first electric push rod is installed on one side of the first fixed tube, and a hanging ring is evenly provided at the bottom end of the first electric push rod, and a bar magnet is evenly provided on the outer wall of one side of the first electric push rod; a material storage box is installed on one side of the top of the base, and a pump is installed at the bottom end of the material storage box, and the pump, motor, first electric push rod, second electric push rod and third electric push rod are all electrically connected to the controller through wires.

[0006] From the contents recorded in the above-mentioned epoxy resin coating composite steel pipe internal spraying device, it can be seen that the device has a complex structure and is propelled in sections by an electric push rod. The single-rod propulsion spraying efficiency is low and it cannot spray small-diameter pipes.

[0007] To this end, the present invention proposes a new heat exchange tube internal spraying equipment that can reduce paint waste, save paint, and reduce production costs, so as to solve the problems of paint waste, poor coating effect, complicated operation, and low safety mentioned in the above technical background. Summary of the Invention

[0008] The present invention solves one of the above-mentioned technical problems, and the technical solution adopted is: it includes a workpiece placement mechanism, which is used to place the heat exchanger tube to be sprayed on the workpiece placement mechanism, and a walking rail on the ground is provided on the rear side of the workpiece placement mechanism. The upper rear side bracket of the walking rail can be moved for adjustment, and a front feeding unit is cooperated with the front end of the workpiece placement, and a spraying pipe group is installed between the front feeding unit and the rear feeding unit. The front end of the spraying pipe group is movable to pass through the front feeding unit, and the rear feeding unit drives the front end of the spraying pipe group to enter the interior of the heat exchanger tube to be sprayed to realize spraying by moving along the placement direction of the equipment. The feed port end of the spraying pipe group is connected to an external sprayer through a pipeline.

[0009] In any of the above schemes, it is preferred that the spray pipe group is composed of a number of spray tubes arranged at intervals and in parallel, the inlet end of each spray tube is connected to an external sprayer through a pipeline, the rear end of each spray tube is fixedly mounted on the rear feeding unit and follows the rear feeding unit to achieve forward and backward displacement, and the front end of each spray tube is movable through the bottom of the front feeding unit and achieves forward and backward displacement under the action of the feeding unit.

[0010] In any of the above solutions, preferably, the front feeding unit includes a front Z-axis feeding mechanism vertically fixedly mounted on the ground, and a front X-axis feeding mechanism perpendicular to the front Z-axis feeding mechanism is fixedly mounted on a slider of the front Z-axis feeding mechanism;

[0011] The rear feeding unit includes a feeding trolley slidably connected to the walking rail, a vertically arranged rear end Z-axis feeding mechanism is installed on the top of the feeding trolley, and a rear end X-axis feeding mechanism perpendicular to the rear end Z-axis feeding mechanism is fixedly installed on the slider of the rear end Z-axis feeding mechanism;

[0012] The front Z-axis feeding mechanism and the rear Z-axis feeding mechanism are in synchronous lifting motion;

[0013] The front Z-axis feed mechanism and the rear Z-axis feed mechanism drive the front X-axis feed mechanism and the rear X-axis feed mechanism to achieve synchronous lifting through synchronous lifting motion;

[0014] A nozzle spacing adjustment component is fixedly installed on the outer bottom of the movable end of the front end x-axis feed mechanism and the outer bottom of the movable end of the rear end Y-axis feed mechanism, and the spray pipe group is respectively arranged between the two nozzle spacing adjustment components.

[0015] In any of the above solutions, it is preferred that the two nozzle spacing adjustment assemblies cooperate synchronously to achieve synchronous adjustment of the spacing between the spray conduits on the spray pipe group.

[0016] In any of the above schemes, preferably, the nozzle spacing adjustment assembly includes a plurality of positioning rails fixedly arranged at intervals on the bottom of the outer end of the movable end of the corresponding Y-axis feed mechanism, and a round tube clamping sleeve is staggered on each of the positioning rails and is slidably engaged with each of the positioning rails through a clamping slide, and each of the round tube clamping sleeves is respectively fitted with the spray conduit passing through both ends thereof;

[0017] Each of the round tube ferrules at the front end is movably plugged into the corresponding spray conduit, and each of the round tube ferrules at the rear end is fixedly plugged into the corresponding spray conduit;

[0018] The spacing distance between the spraying conduits can be adjusted by adjusting the relative spacing distance of the round tube ferrules.

[0019] In any of the above solutions, preferably, a camera for observing the inner cavity of the heat exchange tube is fixedly mounted on the front side wall of the outer end of the movable end of the front end Y-axis feed mechanism.

[0020] In any of the above schemes, preferably, the front end of the movable end of the front end Y-axis feeding mechanism at each electric nozzle at the front end of each spraying conduit is provided with an infrared level for alignment.

[0021] In any of the above schemes, it is preferred that the workpiece placement mechanism includes a workpiece positioning rail fixed on the ground, and a walking roller frame is respectively engaged with the front and rear sides of the workpiece positioning rail, and support rollers are movably installed on the inner and outer sides of each walking roller frame, and the top of each support roller is used to abut and cooperate with the bottom of the outer wall of the heat exchanger tube to be sprayed placed above it.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The heat exchanger tube spraying equipment of the present invention adopts the tube spraying method, which greatly reduces the waste of paint, saves paint and reduces production costs.

[0024] 2. During the entire spraying process, the heat exchanger tube spraying equipment is in a horizontal state, which is highly safe.

[0025] 3. The overall equipment of the present invention has a high degree of mechanization, simple operation and low labor cost.

[0026] 4. In this equipment, multiple spraying tubes are used for spraying at the same time, which greatly increases the efficiency of spraying construction; at the same time, small-diameter spraying tubes are used to spray small-diameter pipe bundles.

[0027] 5. The spraying end of the equipment uses a camera to observe the internal conditions of each tube bundle of the heat exchange tube, and cooperates with the multi-directional electric adjustment of the nozzle position, which is more convenient and accurate.

[0028] 6. When the entire equipment is moving and adjusting its position, the ground rail electric adjustment is used to realize forward and backward movement, making the spraying stroke more stable, and the different speeds can be adjusted according to actual conditions, making the spraying process more convenient.

[0029] 7. Use the existing infrared level to determine the coordinates, which greatly reduces the difficulty of operation, achieves accurate positioning, and is more convenient and reliable.

[0030] 8. The nozzle installed at the front end of the spray duct can be a professional 360° or 0° atomizing nozzle, which can achieve 360° atomizing spraying without dead angles according to the situation inside the pipe. Combined with the professional flow monitoring assembly, it ensures that the surface coating is complete and uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or components are generally identified by similar reference numerals throughout the drawings. Elements or components in the drawings are not necessarily drawn to scale.

[0032] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0033] Figure 2 It is a partial top view structural schematic diagram of the present invention.

[0034] Figure 3 It is a partial side view structural schematic diagram of the present invention.

[0035] Figure 4 It is a schematic diagram of the local three-dimensional structure of the present invention.

[0036] In the figure, 1. workpiece placement mechanism; 101. workpiece positioning turntable; 102. workpiece positioning movable turntable; 2. walking rail; 3. sprayer; 401. spraying guide tube; 402. positioning guide rail; 6. scanning camera; 7. computer analysis assembly; 8. Z-axis feed mechanism; 9. Y-axis feed mechanism; 10. feeding trolley; 11. round tube ferrule; A. heat exchanger tube; B. front feeding unit; C. rear feeding unit. DETAILED DESCRIPTION

[0037] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only used as examples and are not intended to limit the scope of protection of the present invention. Figure 1-4 As shown in .

[0038] Example 1:

[0039] The heat exchanger tube internal spraying equipment includes a workpiece placement mechanism 1, which is used to place the heat exchanger tube A to be sprayed on the workpiece placement mechanism 1. Two turntables are placed in front and behind the position of the workpiece placement mechanism 1. The front turntable 101 is a fixed turntable and the rear turntable 102 is a movable turntable. The distance of 102 can be adjusted according to the length of the equipment. The main function of the workpiece placement mechanism is to adjust the placement angle of the equipment. A walking rail 2 fixed to the ground at intervals is provided on the rear side of the workpiece placement mechanism. A front feeding unit B is fixedly installed at the front end of the walking rail 2, and a rear feeding unit C is cooperated with the rear end of the walking rail 2. A spraying pipe group is cooperated with the front feeding unit B and the rear feeding unit C. The front end of the spraying pipe group movably passes through the front feeding unit B, and the rear feeding unit C drives the front end of the spraying pipe group to enter the interior of the heat exchanger tube A to be sprayed by moving along the length direction of the walking rail 2 to realize spraying. The feed port end of the spraying pipe group is connected to the external sprayer 3 through a pipeline. The heat exchanger tube internal spraying equipment adopts a workpiece placement mechanism 1 to place and adjust the heat exchanger, so that it can effectively cooperate with the displacement of the front feeding unit B and the rear feeding unit C at its rear end to drive the spraying tube group to achieve alignment with the positioned heat exchanger tube, and finally, after adjustment and alignment, the work of the sprayer 3 is used to realize the internal spraying of the heat exchanger tube.

[0040] In any of the above schemes, it is preferred that the spray pipe group is composed of a plurality of spray pipes 401 spaced apart and arranged in parallel, the inlet end of each spray pipe 401 is connected to the external sprayer 3 via a pipeline, the rear end of each spray pipe 401 is fixedly mounted on the front feed unit B and follows the rear feed unit C to achieve forward and backward displacement, and the front end of each spray pipe 4 is movable through the bottom of the front feed unit B and achieves forward and backward displacement under the action of the feed unit. The nozzle spacing adjustment component here adopts a method of spacing multiple spray pipes 401 and setting the spacing distance between each spray pipe 401 to an adjustable state, which can ensure that it can realize the adjustment control between each nozzle spacing adjustment component as needed to ensure its effect during the later spraying.

[0041] In any of the above schemes, it is preferred that the front feeding unit B includes a feeding trolley 10 that is slidably connected to the walking rail 2, and also includes a front end Z-axis feeding mechanism 8 vertically fixedly installed on the platform, and a front end X-axis feeding mechanism 2 perpendicular to it is fixedly installed on the slider of the front end Z-axis feeding mechanism 8; the rear feeding unit C includes a feeding trolley 10 that is slidably connected to the walking rail 2, and a vertically arranged rear end Z-axis feeding mechanism 8 is installed on the top of the feeding trolley 10, and a front end Z-axis feeding mechanism 8 is fixed on the slider of the rear end Z-axis feeding mechanism 8. A rear end Y-axis feed mechanism 9 is installed which is perpendicular to it; the front end Z-axis feed mechanism 8 and the rear end Z-axis feed mechanism are for synchronous lifting and lowering movements; the front end Z-axis feed mechanism 8 and the rear end Z-axis feed mechanism move left and right synchronously to drive the front end Y-axis feed mechanism and the rear end Y-axis feed mechanism 9 to achieve synchronous forward and backward extension; a nozzle spacing adjustment component is fixedly installed on the top of the moving end of the front end Y-axis feed mechanism and the top of the moving end of the rear end Y-axis feed mechanism, and the spray pipe group is respectively arranged between the two nozzle spacing adjustment components.

[0042] When the front Z-axis feed mechanism 8 and the rear Z-axis feed mechanism are in operation, they can synchronously drive the feeding trolley 10 at their respective positions, and the front feeding trolley 10 and the rear feeding mechanism can be at the same horizontal height and can follow and achieve synchronous lifting. While the front X-axis feed mechanism 2 and the rear X-axis feed mechanism control the horizontal movement along the X-axis, the front Y-axis feed mechanism and the rear Y-axis feed mechanism can synchronously achieve horizontal forward and backward displacement along the Y-axis direction. Therefore, under the mutual cooperation of the front X-axis feed mechanism 2, the rear X-axis feed mechanism, the front Y-axis feed mechanism, and the rear Y-axis feed mechanism, the horizontal adjustment of the entire spray tube group and the adjustment of the heat exchanger tube group closer to or away from the heat exchanger tube in the radial direction can be achieved, which is convenient for alignment adjustment.

[0043] In any of the above schemes, it is preferred that the two nozzle spacing adjustment components cooperate synchronously to achieve synchronous adjustment of the spacing between the various spray tubes 401 on the spray tube group; the nozzle spacing adjustment component includes a plurality of positioning guide rails 402 that are spaced and fixedly arranged at the bottom of the outer end of the movable end of the corresponding Y-axis feed mechanism, and each of the positioning guide rails 402 is staggered with a round tube clamp 11 that is slidably engaged with each of the positioning guide rails 402 through a clamping slide, and each of the round tube clamps 11 is respectively fitted with the spray tube 401 passing through its two ends; the round tube clamps 11 at the front end and the corresponding spray tube 401 are movable plug-in fit, and the round tube clamps 11 at the rear end and the corresponding spray tube 401 are fixed plug-in fit; the spacing distance between the spray tubes 401 can be adjusted by adjusting the relative spacing distance of the round tube clamps 11. The nozzle spacing adjustment component 7 is mainly adjusted by adjusting the relative spacing distance of each round tube sleeve 11 at the front and rear ends. After adjustment, the two round tube sleeves 11 at the front and rear ends that match the same spray tube 401 can be in a synchronous displacement state when shifting; ultimately, the purpose of adjusting the spacing distance between each spray tube 401 can be achieved, which is convenient for adjustment according to spraying requirements.

[0044] Example 2:

[0045] The heat exchanger tube internal spraying equipment includes a workpiece placement mechanism 1, which is used to place the heat exchanger tube A to be sprayed on the workpiece placement mechanism 1. A walking rail 2 fixed on the ground at intervals is provided on the rear side of the workpiece placement mechanism 1. A front feeding unit B is fixedly installed at the front end of the walking rail 2, and a rear feeding unit C is cooperatedly installed at the rear end of the front feeding unit B. A spraying pipe group is cooperatedly installed between the front feeding unit B and the rear feeding unit C. The front end of the spraying pipe group movably passes through the front feeding unit B, and the rear feeding unit C drives the front end of the spraying pipe group to enter the interior of the heat exchanger tube A to be sprayed by moving along the length direction of the walking rail 2 to realize spraying. The feed port end of the spraying pipe group is connected to an external sprayer 3 through a pipeline.

[0046] The heat exchanger tube internal spraying equipment adopts a workpiece placement mechanism 1 to place and adjust the heat exchanger, so that it can effectively cooperate with the displacement of the front feeding unit B and the rear feeding unit C at its rear end to drive the spraying tube group to achieve alignment with the positioned heat exchanger tube, and finally, after adjustment and alignment, the work of the sprayer 3 is used to realize the internal spraying of the heat exchanger tube.

[0047] In any of the above schemes, it is preferred that the spray pipe group is composed of a number of spray tubes 401 that are spaced apart and arranged in parallel, the inlet end of each spray tube 5 is connected to the external sprayer 3 through a pipeline, the rear end of each spray tube 401 is fixedly mounted on the rear feeding unit C and follows the rear feeding unit C to achieve forward and backward displacement, and the front end of each spray tube 401 is movable through the bottom of the front feeding unit B and achieves forward and backward displacement under the action of the feeding unit.

[0048] The spray pipe group here adopts a method of setting multiple spray tubes 401 at intervals and setting the interval distance between each spray tube 401 to an adjustable state, which can ensure that the position adjustment control between each spray tube 401 can be achieved as needed to ensure the effect during the later spraying.

[0049] In any of the above schemes, preferably, the front feeding unit B includes a front Z-axis feeding mechanism 8 vertically fixedly mounted on the ground, and a front Y-axis feeding mechanism perpendicular to the front Z-axis feeding mechanism is fixedly mounted on the slider of the front Z-axis feeding mechanism 2;

[0050] The rear feeding unit C includes a feeding trolley 10 that is slidably connected to the walking rail 2, and a vertically arranged rear end Z-axis feeding mechanism 8 is installed on the top of the feeding trolley 10, and a rear end Y-axis feeding mechanism 5 perpendicular to it is fixedly installed on the slider of the rear end Z-axis feeding mechanism; the front end Z-axis feeding mechanism 8 and the rear end Z-axis feeding mechanism are synchronously lifted and lowered; the front end Z-axis feeding mechanism 8 and the rear end Z-axis feeding mechanism drive the front end Y-axis feeding mechanism and the rear end Y-axis feeding mechanism to achieve synchronous lifting and lowering through synchronous lifting and lowering; a nozzle spacing adjustment component is fixedly installed on the outer end bottom of the moving end of the front end Y-axis feeding mechanism and the outer end bottom of the moving end of the rear end Y-axis feeding mechanism, and the spray pipe group 11 is respectively provided between the two nozzle spacing adjustment components.

[0051] When working, the front Z-axis feed mechanism 8 and the rear Z-axis feed mechanism can synchronously drive the front Y-axis feed mechanism and the rear Y-axis feed mechanism at their respective positions to be at the same horizontal height and can follow and achieve synchronous lifting.

[0052] While the front-end Z-axis feed mechanism 8 and the rear-end Z-axis feed mechanism control the lifting height along the Z-axis, the front-end Y-axis feed mechanism and the rear-end Y-axis feed mechanism can synchronously realize horizontal synchronous displacement along the Y-axis direction. Therefore, with the cooperation of the front-end Z-axis feed mechanism 8, the rear-end Z-axis feed mechanism, the front-end Y-axis feed mechanism and the rear-end Y-axis feed mechanism, the height adjustment of the entire spray tube group and the adjustment of the heat exchanger tube group closer to or away from the heat exchanger tube in the radial direction can be realized, which is convenient for positioning adjustment.

[0053] In any of the above solutions, it is preferred that the two nozzle spacing adjustment components cooperate synchronously to achieve synchronous adjustment of the spacing between the spray conduits 401 on the spray pipe group.

[0054] In any of the above schemes, it is preferred that the nozzle spacing adjustment component includes a plurality of positioning rails 402 that are spaced apart and fixedly arranged at the bottom of the outer end of the movable end of the corresponding Y-axis feed mechanism, and a round tube clamp 11 is staggered on each of the positioning rails 402 and is slidably engaged with each of the positioning rails 402 through a clamping slide, and each of the round tube clamps 11 is respectively fitted with the spray conduit 401 passing through its two ends; the round tube clamps 11 at the front end and the corresponding spray conduit 401 are movably engaged, and the round tube clamps at the rear end and the corresponding spray conduit 401 are fixedly engaged; the spacing distance between the spray conduits 401 can be adjusted by adjusting the relative spacing distance of the round tube clamps 11.

[0055] The nozzle spacing adjustment component mainly relies on adjusting the relative spacing distance of each round tube sleeve 11 at the front and rear ends when adjusting. After adjustment, the two round tube sleeves 11 at the front and rear ends that match the same spray tube 401 can be in a synchronous displacement state when shifting; ultimately, the purpose of adjusting the spacing distance between each spray tube 401 can be achieved, which is convenient for adjustment according to spraying requirements.

[0056] In any of the above solutions, preferably, a camera for observing the inner cavity of the heat exchanger tube is fixedly installed on the front side wall of the outer end of the movable end of the front Y-axis feeding mechanism 4.

[0057] The spraying end of the equipment uses a camera to observe the internal conditions of each tube bundle of the heat exchanger tube, and cooperates with the multi-directional electric adjustment of the nozzle position, which is more convenient and accurate.

[0058] In any of the above solutions, preferably, the front end of the movable end of the front end Y-axis feeding mechanism at each electric nozzle at the front end of each spraying conduit 401 is provided with an infrared level for alignment.

[0059] The existing infrared level is used to determine the coordinates, which greatly reduces the difficulty of operation, achieves accurate positioning, and is more convenient and reliable.

[0060] In any of the above schemes, it is preferred that the workpiece placement mechanism 1 includes a workpiece positioning rail fixed on the ground, and the front and rear sides of the workpiece positioning rail are respectively engaged with walking roller frames, and support rollers are movably installed on the inner and outer sides of the walking roller frames, and the top of each support roller is used to abut and cooperate with the bottom of the outer wall of the heat exchanger tube A to be sprayed placed above it.

[0061] Each traveling roller frame can be shifted forward and backward along the workpiece positioning track 101 under the action of external force as needed, so as to achieve the purpose of controlling and adjusting the forward and backward displacement of the heat exchanger tube A.

[0062] Specific working principle:

[0063] The present invention provides a technical solution: a coating process for the inside of a heat exchanger tube A, the process comprising the following steps: 1. positioning the heat exchanger workpiece; 2. adjusting and positioning the spraying pipeline; 3. spraying the inside of the heat exchanger tube; 4. waiting for the surface to dry after spraying is completed.

[0064] Specifically, the main process operation flow is as follows:

[0065] S1. Use a crane to lift the heat exchanger onto the traveling roller frame and keep it horizontal.

[0066] S2. After turning on the infrared level and camera on the front feeding unit B to determine the moving position of the front end of the heat exchanger, move the two traveling roller frames to the determined position, and open the roller clamps configured for the supporting rollers on the traveling roller frames to lock the rollers and prevent the heat exchanger from moving as a whole;

[0067] S3. Use the camera and infrared level attached to the front feeding unit B to take pictures and locate the heat exchanger tube bundle A to determine the arrangement and coordinates of the heat exchanger tube bundle A;

[0068] S4. Turn on the existing numerical control device on the external sprayer 3, select a program that matches the heat exchanger assembly, and begin the automatic pipe positioning process. This process utilizes the existing program and position coordinates to control the front Y-axis feed mechanism 4, the rear Y-axis feed mechanism, and the nozzle spacing adjustment assembly 11, driving the overall adjustment and movement of each spray conduit 4 until each spray conduit 4 corresponds to each tube bundle in the heat exchanger.

[0069] S5. Turn on the adjustable speed motor on the feeding trolley 10, causing it to move forward horizontally at a constant speed on the running rail 402, driving the rear feeding unit C to move, and then driving each spray pipe 401 to move forward horizontally at a constant speed. The forward speed is controlled at 1-2 m / s. After the nozzles at the front section of each spray pipe 401 have completely leaked out of the rear end of the heat exchanger, turn off the adjustable speed motor and control the feeding trolley 10 to stop.

[0070] S6. Turn on the spray gun on the sprayer 3 and turn on the flow monitoring assembly on the spray gun, and control the flow rate at 0.1-0.5L / min until the paint flow rate stabilizes;

[0071] S7. After the flow rate stabilizes, the adjustable speed motor on the feeding trolley 10 is turned on and the trolley moves horizontally and uniformly along the ground rail 2, driving the rear feeding unit C to move, and then driving each spray pipe 4 to move horizontally and uniformly backward at a speed of 0.1-0.3 m / s until the nozzle at the front end of each spray pipe 401 completely leaks out from the other end of the heat exchanger. Then, the adjustable speed motor 12 and the spray gun are turned off.

[0072] S8. Repeat S4, S5, S6, and S7 until all pipes of the heat exchanger are coated, then turn off all switches of all spraying equipment and cut off power.

[0073] S9: Keep the heat exchanger after coating still on the walking roller frame 102 for 10-30 minutes to dry the surface. After that, the surface drying is completed and other operations can be carried out. The specific surface drying time is based on whether the coating surface is sticky when touched by hand.

[0074] Glossary:

[0075] The Z-axis mentioned in the present invention refers to the direction extending along the vertical height direction, the Y-axis refers to the direction along the axial direction of the heat exchanger tube to be sprayed, and the X-axis refers to the direction extending along the radial direction of the heat exchanger tube to be sprayed.

[0076] The feeding mechanism mentioned above is one or more of the sliding screw feeding mechanism, rolling screw, liquid hydrostatic screw, air hydrostatic screw, hydrostatic cylinder feeding mechanism, DC linear motor feeding mechanism and micro feeding mechanism in the prior art. The specific structure is not limited. Its main function is to realize reciprocating displacement feeding in the linear direction.

[0077] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention. For those skilled in the art, any replacement improvements or changes made to the implementation methods of the present invention fall within the scope of protection of the present invention.

[0078] Any matters not described in detail in the present invention are well-known technologies to those skilled in the art.

Claims

1. The heat exchanger tube internal coating process realized by using the heat exchanger tube internal spraying equipment is characterized by: The heat exchanger tube internal spraying equipment includes a workpiece placement mechanism, the workpiece placement mechanism is used to place the heat exchanger tube to be sprayed, a walking rail installed on the ground is provided on the rear side of the workpiece placement mechanism, a front feeding unit is coordinated with the front end of the workpiece placement mechanism, and a rear feeding unit is coordinated with the rear end of the workpiece placement mechanism, a spraying pipe group is coordinated and installed between the front feeding unit and the rear feeding unit, the front end of the spraying pipe group movably passes through the front feeding unit, and the rear feeding unit drives the front end of the spraying pipe group to enter the interior of the heat exchanger tube to be sprayed and realizes spraying by moving along the equipment placement direction, and the feed port end of the spraying pipe group is connected to an external sprayer through a pipeline; The workpiece placement mechanism includes a workpiece positioning track fixed on the ground, and a walking roller frame is respectively engaged with the front and rear sides of the workpiece positioning track, and support rollers are movably installed on the inner and outer sides of each walking roller frame; The nozzle spacing adjustment components are fixedly installed on the front feeding unit and the rear feeding unit respectively; The nozzle spacing adjustment assembly includes a plurality of positioning rails fixedly arranged at intervals on the bottom of the outer end of the movable end of the corresponding Y-axis feed mechanism, and a round tube clamping sleeve is staggered on each of the positioning rails and is slidably engaged with each of the positioning rails through a clamping slide. A spray pipe passing through both ends of each of the round tube clamping sleeves is respectively engaged; Each of the round tube ferrules at the front end is movably plugged into the corresponding spray conduit, and each of the round tube ferrules at the rear end is fixedly plugged into the corresponding spray conduit; The spacing between the spraying pipes can be adjusted by adjusting the relative spacing between the round tube ferrules; The coating process includes: S1. Use a crane to lift the heat exchanger onto the traveling roller frame and keep it horizontal; S2. Turn on the infrared level and camera on the front feeding unit to determine the moving position of the front end of the heat exchanger. After moving the two traveling roller frames to the determined position, open the roller clamps configured for the supporting rollers on the traveling roller frames to lock the rollers and prevent the heat exchanger from moving as a whole. S3. Use the camera and infrared level attached to the front feeding unit to take pictures and locate the heat exchanger tube bundle to determine the arrangement and coordinates of the heat exchanger tube bundle; S4. Turn on the CNC device on the external sprayer, select the program that matches the heat exchanger assembly, and start the automatic pipe positioning process. By controlling the front Y-axis feed mechanism, the rear Y-axis feed mechanism, and the nozzle spacing adjustment assembly, the spray pipes are adjusted and moved as a whole until each spray pipe corresponds to each tube bundle in the heat exchanger. S5. Turn on the adjustable speed motor on the feeding trolley to make it move forward horizontally at a constant speed on the running rail, driving the rear feeding unit to move, and then driving each spray tube to move forward horizontally at a constant speed. The forward speed is controlled at 1-2m / s. After the nozzles at the front section of each spray tube have completely leaked out of the rear end of the heat exchanger, turn off the adjustable speed motor and control the feeding trolley to stop. S6. Open the spray gun on the sprayer and turn on the flow monitoring assembly configured on the spray gun. Control the flow rate at 0.1-0.5L / min until the paint flow rate stabilizes. S7. After the flow rate stabilizes, turn on the adjustable speed travel motor on the feeding trolley and move it horizontally backward at a uniform speed along the travel rail, driving the rear feeding unit to move, and then driving each spray pipe to move horizontally backward at a uniform speed until the nozzle at the front end of each spray pipe completely leaks out from the other end of the heat exchanger, and then turn off the adjustable speed motor and spray gun; S8. Repeat S4-S7 until all pipes of the heat exchanger are coated, then turn off all spraying equipment, all switches, and power off. S9: Keep the coated heat exchanger on the walking roller frame and continue to dry it for 10-30 minutes before proceeding to other processes.

2. The coating process according to claim 1, characterized in that: The spray pipe group consists of several spray pipes that are spaced apart and arranged in parallel. The inlet end of each spray pipe is connected to an external sprayer through a pipeline. The rear end of each spray pipe is fixedly installed on the rear feeding unit and follows the rear feeding unit to achieve forward and backward displacement. The front end of each spray pipe can move through the bottom of the front feeding unit and achieve forward and backward displacement under the action of the feeding unit.

3. The coating process according to claim 2, characterized in that: The front feeding unit includes a front Z-axis feeding mechanism vertically fixedly mounted on a ground track, and a front X-axis feeding mechanism perpendicular to the front Z-axis feeding mechanism is fixedly mounted under the slider of the front Z-axis feeding mechanism; The rear feeding unit includes a feeding trolley slidably connected to the walking rail, a vertically arranged rear end Z-axis feeding mechanism is installed on the top of the feeding trolley, and a rear end X-axis feeding mechanism perpendicular to the rear end Z-axis feeding mechanism is fixedly installed on the slider of the rear end Z-axis feeding mechanism; The rear feeding unit includes a feeding trolley that is slidably connected to the walking rail, and a feeding trolley is installed on the top of the feeding trolley. The front Z-axis feeding mechanism and the rear Z-axis feeding mechanism are in synchronous lifting motion; The front Z-axis feed mechanism and the rear Z-axis feed mechanism drive the front X-axis feed mechanism and the rear X-axis feed mechanism to achieve synchronous lifting through synchronous lifting motion; A nozzle spacing adjustment component is fixedly installed on the platform of the movable end of the front X-axis feed mechanism and the platform of the movable end of the rear X-axis feed mechanism, and the spray pipe group is respectively arranged between the two nozzle spacing adjustment components.

4. The coating process according to claim 3, characterized in that: The two nozzle spacing adjustment components cooperate synchronously to achieve synchronous adjustment of the spacing between the various spray conduits on the spray pipe group.

5. The coating process according to claim 4, characterized in that: A camera for scanning the arrangement sequence of the heat exchange tubes is fixedly installed on the front side wall of the outer end of the movable end of the front Y-axis feeding mechanism.

6. The coating process according to claim 5, characterized in that: The front end of the moving end of the front end Y-axis feeding mechanism at each electric nozzle at the front end of each spraying conduit is equipped with an infrared scanner assembly for alignment.

7. The coating process according to claim 6, characterized in that: The top of each supporting roller is used to abut and cooperate with the bottom of the outer side wall of the heat exchanger tube to be sprayed placed thereon.

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