Paint removing equipment and paint removing method for airplane forging and casting surface paint layer

Abstract

The invention provides paint removing equipment and method for a paint layer on the surface of an aircraft forging and casting. The equipment comprises an electric trolley rotating disc 1, a working cabin 2, a control cabinet 3, a sand blasting system 4, a shot recycling and screening system 5 and an anti-explosion dust removal system 6. Wherein the electric trolley turntable 1 enters and exits from the working cabin 2 through the trolley guide rail 10, six uniformly-distributed radial grooves and N threaded holes are machined in a working table of the electric trolley turntable 1, and corresponding bolts and nuts are arranged and used for clamping parts. And the control cabinet 3 is connected with each system control electric appliance element through a cable. The sand blasting system 4 is provided with three pipeline connecting ends, one end is connected with a compressed air inlet pipeline, the other end is connected with a spray gun in the working cabin 2, and the other end is connected with the shot recycling and screening system 5. The shot recycling and screening system 5 is provided with three pipeline connecting ends, one end is connected with a hopper type honeycomb floor 20 at the bottom of the working cabin 2 through a pipeline, the other end is connected with a storage hopper 16 of the sand blasting system 4, and the other end is connected with the anti-explosion dust removal system 6.

Description

Technical Field

[0001] The invention relates to the field of paint stripping, in particular to a paint stripping device and a paint stripping method for a paint layer on the surface of an aircraft forging casting. Background Art

[0002] During aircraft overhaul, a large number of parts need to be inspected by flaw detection, of which metal parts that require fluorescent flaw detection account for about one-third. Some of these parts that require fluorescent flaw detection are forgings and castings. Because the surface of forgings and castings is rough, the castings also have a certain porosity and have very good adhesion to the surface paint layer. The commonly used paint stripping processes such as chemical method, flame method, mechanical method, etc. cannot completely remove the old paint layer on the surface of forgings and castings, so that fluorescent flaw detection cannot be performed normally. Usually, a variety of paint stripping methods are required to strip paint, which pollutes the environment, has low efficiency, and is easy to damage the surface of parts.

[0003] In the industry, the most commonly used paint stripping processes are chemical paint stripping and mechanical paint stripping. Chemical paint stripping is to apply paint strippers and other chemical substances to the paint layer to swell the paint layer for removal. The disadvantage is that it pollutes the environment and has poor adaptability to paint types, and it is even more difficult to remove the paint layer on the surface of forgings and castings; mechanical paint stripping is divided into manual grinding and sand blowing, which are suitable for all types of paint, but manual grinding is inefficient and easily damages the surface of parts. Ordinary sand blowing not only pollutes the atmosphere but also may damage the surface of parts. Summary of the invention

[0004] The present application provides a paint stripping device and a paint stripping method for the surface paint layer of aircraft forgings and castings, which can solve the problems of existing paint stripping processes such as environmental pollution, poor adaptability to paint varieties, difficulty in removing the surface paint layer of forgings and castings, and easy damage to the surface of parts.

[0005] In the first aspect, the present application provides a paint stripping device for the surface paint layer of an aircraft forging and casting, comprising an electric trolley turntable 1, a working cabin 2, a control cabinet 3, a sandblasting system 4, a shot recovery and screening system 5, and an explosion-proof dust removal system 6, wherein:

[0006] The electric trolley turntable 1 is arranged on the right side of the working cabin 2. The working table of the electric trolley turntable 1 is processed with six evenly distributed radial grooves and N threaded holes and equipped with corresponding bolts and nuts for clamping parts. The working table of the electric trolley turntable 1 is driven to rotate by a servo motor 7 and a transmission mechanism 8. The working table enters and exits the working cabin 2 through a stepper motor 9 and a trolley guide rail 10.

[0007] The cabin body of the working cabin 2 includes a steel frame, steel wall panels and wear-resistant rubber protective plates. A manual sandblasting glove port 13 and an observation window 14 are provided on the front. An electric trolley turntable 1 is provided on the right. An explosion-proof LED lamp 11 is installed on the top for lighting. Two spray guns 12 are configured inside to sandblast and remove the paint layer on the surface of the parts clamped on the workbench. The spray angle and spray distance of the spray gun 12 are controlled through the glove port 13. The observation window 14 is used to observe the paint removal work;

[0008] The control cabinet 3 is composed of a PLC and a touch screen 15 as the core control unit, which is connected to the control electrical components of each system through cables to control the actions of each system of the equipment; the touch screen 15 is installed on the front panel of the control cabinet 3, and the PLC is installed inside the control cabinet 3;

[0009] The sandblasting system 4 is arranged on the left side of the working cabin 2, the top end is connected to the shot recovery and screening system 5, the side end is connected to the compressed air intake pipe, and the lower end is connected to the spray gun 12 inside the working cabin 2 through the sandblasting hose;

[0010] The shot recovery and screening system 5 is arranged between the working cabin 2, the sandblasting system 4 and the explosion-proof dust removal system 6. The bottom end is connected to the bottom of the working cabin 2 through a bucket-type honeycomb floor 20, the top end is connected to the explosion-proof dust removal system 6 through a cyclone separator 21, and the lower end is connected to the sandblasting system 4 through a vibrating screening machine 22;

[0011] The explosion-proof dust removal system 6 is arranged at the rear end of the shot recovery and screening system 5, and adopts a three-stage dust removal mode, including a primary cyclone separator 21, a secondary dry explosion-proof filter element dust collector 23, and a third-stage wet liquid explosion-proof dust collector 24, to ensure that the amount of waste gas dust discharged by the equipment meets the direct emission standard.

[0012] Specifically, the sandblasting system 4 includes a storage hopper 16, a pill tank 17, a flow valve 18, a pressure valve, a sandblasting tube and a spray gun 12. The upper end of the storage hopper 16 is connected to the vibrating screening machine 22 of the pill recovery and screening system 5, and the lower end is connected to the pill tank 17, for storing the recovered pills and delivering the pills into the pill tank 17; the pill tank 17 is connected to the compressed air intake pipe, and the lower end is connected to the flow valve 18. One end of the flow valve 18 is connected to the compressed air, and the other end is connected to the spray gun 12 inside the working cabin 2 through a sandblasting hose; the pill flow rate is set by the flow valve 18, and the delivery and stop of the pills are controlled by the pedal switch 19.

[0013] Specifically, the shot recovery and screening system 5 includes a bucket-type honeycomb floor 20, a return sand pipe 23, a vibrating screener 22, and a waste box; the bucket-type honeycomb floor 20 is installed at the bottom of the working cabin 2, recovers all shot and working dust, and is connected to the cyclone separator 21 through the return sand pipe 23. The cyclone separator 21 separates the shot and working dust, and the separated dust enters the explosion-proof dust removal system 6 at the top, and the separated shot enters the vibrating screener 22 at the lower end. The lower end of the vibrating screener 22 is connected to the waste box, and the side end is connected to the storage hopper 16. After vibration screening, it is ensured that the shot that does not meet the mesh size enters the waste box, and the qualified shot returns to the storage hopper 16 for continued recycling.

[0014] Specifically, the explosion-proof dust removal system 6 includes a cyclone separator 21, a dust suction duct 24, a dry explosion-proof filter element dust collector 25, a dust collecting box, a wet liquid explosion-proof dust collector 26, and a dust exhaust duct 27; the cyclone separator 21 is arranged at the top of the system, and after the recovered pills and dust are separated, the dust-containing air enters the dry explosion-proof filter element dust collector 23 through the dust suction duct 24 and is filtered by multiple filter elements. The exhaust air enters the wet liquid explosion-proof dust collector 26 through the dust suction duct 24 and is filtered again, and then is discharged through the dust exhaust duct 27 to ensure that the amount of exhaust gas dust discharged meets the direct emission standard.

[0015] Specifically, the cyclone separator 21 is a conical cylinder made of thick steel plates and wear-resistant lining steel plates. The upper section of the cylinder is a cylinder. A square air inlet connected to the return sand pipe 23 is installed in the tangential direction of the upper section. A rectangular air outlet connected to the dry explosion-proof filter element dust collector 23 is installed on the top of the cylinder. The lower section of the cylinder is a cone and is connected to the vibrating screening machine 22. The cyclone separator 21 separates the dust particles.

[0016] Specifically, the dry explosion-proof filter element dust collector 23 is a box made of thick steel plates and brackets. The upper part of the box is a rectangular parallelepiped, which is divided into two cavities: air inlet and air outlet. N explosion-proof dust filter elements are installed inside the air inlet cavity. A circular air inlet is installed at the top and is connected to the air outlet of the cyclone separator 21. The bottom is a conical dust hopper connected to the dust collecting box; the air outlet cavity is connected to the inner hole of the explosion-proof dust filter element, and an air outlet is installed at the top and is connected to the wet liquid explosion-proof dust collector 26. The dry explosion-proof filter element dust collector 23 separates dust particles.

[0017] Specifically, the wet liquid explosion-proof dust collector 24 is a box made of stainless steel plates and brackets. The upper part of the box is equipped with a fan and an air outlet, the lower part is a water storage area, the side is provided with an overflow port and a sewage outlet, and the bottom of the box is provided with a water tank; the wet liquid explosion-proof dust collector 24 controls the dust concentration of the air at the outlet to 3mg / m through the adsorption and condensation effect of spraying water mist. 3 Within.

[0018] In a second aspect, the present application provides a method for removing paint from a surface paint layer of an aircraft forging and casting, the method comprising:

[0019] Step 1: Turn on the power of the equipment on the control cabinet 3, open the door of the working cabin 2, and press the trolley exit button on the control cabinet 3;

[0020] Step 2: After the electric trolley turntable 1 stops exiting the cabin, clamp the parts to be stripped on the work surface, and press the trolley entry button on the control cabinet 3;

[0021] Step 3: After the electric trolley turntable 1 stops entering the cabin, the resin pellets are loaded into the bucket-type honeycomb floor 20, and the door of the working cabin 2 is closed;

[0022] Step 4: After adjusting the shot flow rate of the flow valve 18, set the working parameters on the touch screen 15, and control two working modes, including automatic mode and manual mode, through the working mode knob on the front of the working cabin 2.

[0023] Specifically, the automatic mode is: step on the pedal switch 19 to start, the electric trolley turntable 1 drives the parts to rotate together, and the spray gun 12 outputs resin pills to the surface of the parts at a fixed angle and distance according to the set pressure for automatic shot peening and paint stripping. The work stops after the shot peening time is reached. The paint stripping condition can also be observed through the observation window 14 in the middle, and the paint stripping work can be stopped by stepping on the pedal switch 19 as appropriate; after the paint stripping is completed, the door of the working cabin 2 is opened, and the trolley out-of-cabin button on the control cabinet 3 is pressed. After the electric trolley turntable 1 stops out of the cabin, the parts are removed to complete the paint stripping of the parts. If it is necessary to remove the paint layer on the surface of other parts, re-clamp them and repeat the above process. If all the work is completed, press the trolley in-cabin button on the control cabinet 3. After the electric trolley turntable 1 stops entering the cabin, the door of the working cabin 2 is closed, and the power of the equipment is turned off on the control cabinet 3 to complete the entire paint stripping work.

[0024] Specifically, the manual mode is: press and hold the pedal switch 19 to start, the electric trolley turntable 1 drives the parts to rotate together, the worker holds the spray gun 12 through the glove port 13 to adjust the spray angle and distance as needed, and outputs resin pills to the surface of the parts at a set pressure for manual shot peening and paint stripping, and observes the paint stripping status in real time through the observation window 14, and releases the pedal switch 19 as needed to stop the paint stripping work; after the paint stripping is completed, open the door of the working cabin 2, press the trolley out-of-cabin button on the control cabinet 3, and after the electric trolley turntable 1 stops out of the cabin, remove the parts to complete the paint stripping of the parts. If it is necessary to remove the paint layer on the surface of other parts, re-clamp them and repeat the above process. If all the work is completed, press the trolley in-cabin button on the control cabinet 3, and after the electric trolley turntable 1 stops entering the cabin, close the door of the working cabin 2, and turn off the power of the equipment on the control cabinet 3 to complete the entire paint stripping work.

[0025] In summary, the present application provides a paint stripping device and a paint stripping method for the paint layer on the surface of aircraft forgings and castings, which have the following advantages:

[0026] 1 The paint stripping method of the present invention sprays resin pellets with low hardness on the surface of forgings and castings at low pressure. The pellets impact the paint layer on the surface of forgings and castings with a certain pressure, which can effectively and quickly remove the paint layer on the surface of the parts without damaging the parts. It has two modes of automatic paint stripping and manual paint stripping. The maximum workpiece diameter can reach 1500mm and the weight can reach 500kg.

[0027] 2 The paint stripping equipment of the present invention has its own pellet recovery and screening system which can continuously deliver resin pellets to the spray gun, and is equipped with a three-stage explosion-proof dust removal system. The processed products do not pollute the environment, and the waste gas can be directly discharged. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of a paint stripping device for a paint layer on a surface of an aircraft forging and casting provided in the present application;

[0029] Figure 2 A schematic diagram of an electric trolley and a working cabin provided for this application;

[0030] Figure 3 A schematic diagram of a pellet recovery and screening system provided in this application;

[0031] Figure 4 A schematic top view of an explosion-proof dust removal system provided in this application;

[0032] Among them: 1-electric trolley turntable, 2-working cabin, 3-control cabinet, 4-sandblasting system, 5-shot recovery and screening system, 6-explosion-proof dust removal system, 7-servo motor, 8-transmission mechanism, 9-stepping motor, 10-trolley guide rail, 11-explosion-proof LED lamp, 12-spray gun, 13-glove port, 14-observation window, 15-touch screen, 16-storage hopper, 17-shot tank, 18-flow valve, 19-pedal switch, 20-bucket honeycomb floor, 21-cyclone separator, 22-vibration screening machine, 23-return sand pipe, 24-dust suction pipe, 25-dry explosion-proof filter element dust collector, 26-wet liquid explosion-proof dust collector, 27-dust exhaust pipe. DETAILED DESCRIPTION

[0033] The purpose of the present invention is to provide a method for removing the paint layer on the surface of aircraft forgings and castings, which can quickly and effectively remove the paint layer on the surface of aircraft forgings and castings; another purpose is to provide a paint stripping device for removing the paint layer on the surface of aircraft forgings and castings, which solves the problem that ordinary equipment pollutes the environment and may damage parts.

[0034] Embodiment 1

[0035] like Figure 1-4 As shown, the present invention provides a paint stripping device for the surface paint layer of aircraft forgings and castings, comprising an electric trolley turntable 1, a working cabin 2, a control cabinet 3, a sandblasting system 4, a shot recovery and screening system 5, and an explosion-proof dust removal system 6, wherein:

[0036] The electric trolley turntable 1 is arranged on the right side of the working cabin 2. The working table of the electric trolley turntable 1 is processed with six evenly distributed radial grooves and N threaded holes and equipped with corresponding bolts and nuts for clamping parts. The working table of the electric trolley turntable 1 is driven to rotate by a servo motor 7 and a transmission mechanism 8. The working table enters and exits the working cabin 2 through a stepper motor 9 and a trolley guide rail 10.

[0037] The cabin body of the working cabin 2 includes a steel frame, steel wall panels and wear-resistant rubber protective plates. A manual sandblasting glove port 13 and an observation window 14 are provided on the front. An electric trolley turntable 1 is provided on the right. An explosion-proof LED lamp 11 is installed on the top for lighting. Two spray guns 12 are configured inside to sandblast and remove the paint layer on the surface of the parts clamped on the workbench. The spray angle and spray distance of the spray gun 12 are controlled through the glove port 13. The observation window 14 is used to observe the paint removal work;

[0038] The control cabinet 3 is composed of a PLC and a touch screen 15 as the core control unit, which is connected to each system control electrical component through cables to control the operation of each system of the equipment. The touch screen 15 is installed on the front panel of the control cabinet 3, and the PLC is installed inside the control cabinet 3.

[0039] The sandblasting system 4 is arranged on the left side of the working cabin 2, the top end is connected to the shot recovery and screening system 5, the side end is connected to the compressed air intake pipe, and the lower end is connected to the spray gun 12 inside the working cabin 2 through a sandblasting hose.

[0040] The shot recovery and screening system 5 is arranged between the working cabin 2, the sandblasting system 4 and the explosion-proof dust removal system 6. The bottom end is connected to the bottom of the working cabin 2 through a bucket-type honeycomb floor 20, the top end is connected to the explosion-proof dust removal system 6 through a cyclone separator 21, and the lower end is connected to the sandblasting system 4 through a vibrating screening machine 22.

[0041] The explosion-proof dust removal system 6 is arranged at the rear end of the shot recovery and screening system 5, and adopts a three-stage dust removal mode, including a primary cyclone separator 21, a secondary dry explosion-proof filter element dust collector 23, and a third-stage wet liquid explosion-proof dust collector 24, to ensure that the amount of waste gas dust discharged by the equipment meets the direct emission standard.

[0042] It should be noted that two spray guns 12 are arranged inside the working cabin 2, one for use and one for standby, and they can work simultaneously to improve the paint stripping efficiency.

[0043] Specifically, the sandblasting system 4 includes a storage hopper 16, a pill tank 17, a flow valve 18, a pressure valve, a sandblasting tube and a spray gun 12. The upper end of the storage hopper 16 is connected to the vibrating screening machine 22 of the pill recovery and screening system 5, and the lower end is connected to the pill tank 17, for storing the recovered pills and feeding the pills into the pill tank 17. The pill tank 17 is connected to the compressed air intake pipe, and the lower end is connected to the flow valve 18. One end of the flow valve 18 is connected to the compressed air, and the other end is connected to the spray gun 12 inside the working cabin 2 through a sandblasting hose; the pill flow rate is set by the flow valve 18, and the delivery and stop of the pills are controlled by the pedal switch 19.

[0044] Specifically, the shot recovery and screening system 5 includes a bucket-type honeycomb floor 20, a return sand pipe 23, a vibrating screen 22 and a waste box; the bucket-type honeycomb floor 20 is installed at the bottom of the working cabin 2, recovers all shot and working dust, and is connected to the cyclone separator 21 through the return sand pipe 23. The cyclone separator 21 separates the shot and working dust, and the separated dust enters the explosion-proof dust removal system 6 at the top, and the separated shot enters the vibrating screen 22 at the lower end. The lower end of the vibrating screen 22 is connected to the waste box, and the side end is connected to the storage hopper 16. After vibration screening, it is ensured that the shot that does not meet the mesh size enters the waste box, and the qualified shot returns to the storage hopper 16 for continued recycling.

[0045] Specifically, the explosion-proof dust removal system 6 includes a cyclone separator 21, a dust suction duct 24, a dry explosion-proof filter element dust collector 25, a dust collecting box, a wet liquid explosion-proof dust collector 26, and a dust exhaust duct 27; the cyclone separator 21 is arranged at the top of the system, and after the recovered pills and dust are separated, the dust-containing air enters the dry explosion-proof filter element dust collector 23 through the dust suction duct 24 and is filtered by multiple filter elements. The exhaust air enters the wet liquid explosion-proof dust collector 26 through the dust suction duct 24 and is filtered again, and then is discharged through the dust exhaust duct 27 to ensure that the amount of exhaust gas dust discharged meets the direct emission standard.

[0046] Specifically, the cyclone separator 21 is a conical cylinder made of 5mm thick steel plate and 1 layer of wear-resistant lining steel plate. The upper section of the cylinder is a cylinder, and a square air inlet connected to the return sand pipe 23 is installed in the tangential direction of the upper section. A rectangular air outlet connected to the dry explosion-proof filter element dust collector 23 is installed on the top of the cylinder. The lower section of the cylinder is a cone and is connected to the vibrating screening machine 22. The cyclone separator 21 can separate dust particles larger than 5um-10um.

[0047] Specifically, the dry explosion-proof filter element dust collector 23 is a box made of 5mm thick steel plate and a bracket. The upper part of the box is a rectangular parallelepiped, which is divided into two cavities: air inlet and air outlet. N explosion-proof dust filter elements are installed inside the air inlet cavity. A circular air inlet is installed at the top and is connected to the air outlet of the cyclone separator 21. The bottom is a conical dust hopper connected to the dust collecting box; the air outlet cavity is connected to the inner hole of the explosion-proof dust filter element, and an air outlet is installed at the top and is connected to the wet liquid explosion-proof dust collector 26. The dry explosion-proof filter element dust collector 23 can separate dust particles of 0.3um-1.0um.

[0048] Specifically, the wet liquid explosion-proof dust collector 24 is a box made of 3mm thick stainless steel plate and bracket. The upper part of the box is equipped with a fan and an air outlet, the lower part is a water storage area, the side is provided with an overflow port and a sewage outlet, and the bottom of the box is provided with a water tank. The wet liquid explosion-proof dust collector 24 can control the dust concentration of the air at the outlet to 3mg / m 3 Within.

[0049] Specifically, the working principle of the three-stage explosion-proof dust removal system 6 is as follows: the first-stage cyclone separator 21 uses cyclone separation to separate dust particles larger than 5um, the second-stage dry explosion-proof filter dust collector 23 uses filter filtration to separate dust particles larger than 0.3um, and the third-stage wet liquid explosion-proof dust collector 24 uses water mist adsorption to separate dust particles smaller than 0.3um, and finally the dust concentration in the air can be controlled at 3mg / m 3 Within, meet the direct emission standards.

[0050] Embodiment 2

[0051] like Figure 1-4 As shown, the present invention provides a method for removing paint from the surface paint layer of an aircraft forging casting, which is implemented using the paint removal equipment proposed in the above embodiment, and the method includes:

[0052] Step 1: Turn on the power of the equipment on the control cabinet 3, open the door of the working cabin 2, and press the trolley exit button on the control cabinet 3;

[0053] Step 2: After the electric trolley turntable 1 stops exiting the cabin, clamp the parts to be stripped on the work surface, and press the trolley entry button on the control cabinet 3;

[0054] Step 3: After the electric trolley turntable 1 stops entering the cabin, the resin pellets are loaded into the bucket-type honeycomb floor 20, and the door of the working cabin 2 is closed;

[0055] Step 4: After adjusting the shot flow rate of the flow valve 18, set the working parameters on the touch screen 15, and control the two working modes through the working mode knob on the front of the working cabin 2.

[0056] Among them, the working parameters include spray gun pressure, turntable speed, shot peening time, etc.

[0057] Specifically, the knob is turned to the automatic mode: the pedal switch 19 is pressed to start, the electric trolley turntable 1 drives the parts to rotate together, and the spray gun 12 outputs resin pellets at a fixed angle and distance to the surface of the parts at a set pressure for automatic shot peening and paint stripping. The work stops after the shot peening time is reached. The paint stripping condition can also be observed through the observation window 14 during the process, and the paint stripping work can be stopped by pressing the pedal switch 19 as appropriate. After the paint stripping is completed, the door of the working cabin 2 is opened, and the trolley exit button on the control cabinet 3 is pressed. After the electric trolley turntable 1 stops exiting the cabin, the parts are removed to complete the paint stripping of the parts. If the paint layer on the surface of other parts needs to be removed, re-clamp them and repeat the above process. If all the work is completed, the trolley entry button on the control cabinet 3 is pressed. After the electric trolley turntable 1 stops entering the cabin, the door of the working cabin 2 is closed, and the power supply of the equipment is turned off on the control cabinet 3 to complete the entire paint stripping work.

[0058] Specifically, the knob is turned to manual mode: the pedal switch 19 is pressed and held to start, the electric trolley turntable 1 drives the parts to rotate together, the worker holds the spray gun 12 through the glove port 13 to adjust the spray angle and distance as needed, and outputs the resin pellets to the surface of the parts at the set pressure for manual shot peening and paint removal, and observes the paint removal status in real time through the observation window 14, and the paint removal work can be stopped by releasing the pedal switch 19 as needed. After the paint removal is completed, the door of the working cabin 2 is opened, and the trolley exit button on the control cabinet 3 is pressed. After the electric trolley turntable 1 stops exiting the cabin, the parts are removed to complete the paint removal of the parts. If the paint layer on the surface of other parts needs to be removed, re-clamp them and repeat the above process. If all the work is completed, the trolley entry button on the control cabinet 3 is pressed. After the electric trolley turntable 1 stops entering the cabin, the door of the working cabin 2 is closed, and the power supply of the equipment is turned off on the control cabinet 3 to complete the entire paint removal work.

[0059] In summary, the present application provides a paint stripping device and a paint stripping method for the paint layer on the surface of aircraft forgings and castings, which have the following advantages:

[0060] 1) The paint stripping method of the present invention sprays resin pellets with low hardness on the surface of forgings and castings at low pressure. The pellets impact the paint layer on the surface of forgings and castings with a certain pressure, which can effectively and quickly remove the paint layer on the surface of the parts without damaging the parts. It has two modes of automatic paint stripping and manual paint stripping. The maximum workpiece diameter can reach 1500mm and the weight can reach 500kg.

[0061] 2) The paint stripping equipment of the present invention has its own pellet recovery and screening system which can continuously deliver resin pellets to the spray gun, and is equipped with a three-stage explosion-proof dust removal system. The processed products do not pollute the environment, and the waste gas can be directly discharged.

Claims

1. A paint stripping device for the surface paint layer of aircraft forgings and castings, characterized in that: It includes an electric trolley turntable (1), a working cabin (2), a control cabinet (3), a sandblasting system (4), a shot recovery and screening system (5), and an explosion-proof dust removal system (6), wherein: The electric trolley turntable (1) is arranged on the right side of the working cabin (2). The working table of the electric trolley turntable (1) is processed with six evenly distributed radial grooves and N threaded holes and is equipped with corresponding bolts and nuts for clamping parts. The working table of the electric trolley turntable (1) is driven to rotate by a servo motor (7) and a transmission mechanism (8). The working table enters and exits the working cabin (2) by a stepping motor (9) and a trolley guide rail (10); The working cabin (2) comprises a steel frame, steel wall panels and wear-resistant rubber protective plates, a manual sandblasting glove port (13) and an observation window (14) are arranged on the front, an electric trolley turntable (1) entrance door is arranged on the right, an explosion-proof LED lamp (11) is installed on the top for lighting, two spray guns (12) are arranged inside, and the paint layer on the surface of the parts clamped on the workbench is sandblasted and stripped, and the spray angle and spray distance of the spray gun (12) are controlled through the glove port (13), and the observation window (14) is used to observe the paint stripping working condition; The control cabinet (3) is composed of a PLC and a touch screen (15) as a core control unit, which is connected to the control electrical components of each system through cables to control the actions of each system of the equipment; the touch screen (15) is installed on the front panel of the control cabinet (3), and the PLC is installed inside the control cabinet (3); The sandblasting system (4) is arranged on the left side of the working cabin (2), the top end is connected to the shot recovery and screening system (5), the side end is connected to the compressed air intake pipe, and the bottom end is connected to the spray gun (12) inside the working cabin (2) through a sandblasting hose; The shot recovery and screening system (5) is arranged between the working cabin (2), the sandblasting system (4) and the explosion-proof dust removal system (6), the bottom end of which is connected to the bottom of the working cabin (2) through a bucket-type honeycomb floor (20), the top end of which is connected to the explosion-proof dust removal system (6) through a cyclone separator (21), and the bottom end of which is connected to the sandblasting system (4) through a vibrating screening machine (22); The explosion-proof dust removal system (6) is arranged at the rear end of the shot recovery and screening system (5) and adopts a three-stage dust removal mode, including a first-stage cyclone separator (21), a second-stage dry explosion-proof filter element dust collector (23), and a third-stage wet liquid explosion-proof dust collector (24), to ensure that the amount of waste gas dust discharged by the equipment meets the direct emission standard.

2. The paint stripping device for the surface paint layer of aircraft forgings and castings according to claim 1 is characterized in that: The sandblasting system (4) comprises a storage hopper (16), a pill tank (17), a flow valve (18), a pressure valve, a sandblasting tube and a spray gun (12). The upper end of the storage hopper (16) is connected to a vibrating screening machine (22) of a pill recovery and screening system (5), and the lower end is connected to the pill tank (17), and is used to store recovered pills and deliver the pills into the pill tank (17); the pill tank (17) is connected to a compressed air intake pipeline, and the lower end is connected to a flow valve (18); one end of the flow valve (18) is connected to compressed air, and the other end is connected to a spray gun (12) inside a working cabin (2) through a sandblasting hose; the pill flow rate is set by the flow valve (18), and the delivery and stop of the pills are controlled by a pedal switch (19).

3. The paint stripping device for the surface paint layer of an aircraft forging and casting according to claim 1 is characterized in that: The pellet recovery and screening system (5) comprises a bucket-type honeycomb floor (20), a return sand pipe (23), a vibration screening machine (22), and a waste box; the bucket-type honeycomb floor (20) is installed at the bottom of the working cabin (2), recovers all pellets and working dust, and is connected to a cyclone separator (21) through a return sand pipe (23); the cyclone separator (21) separates the pellets and working dust, and the separated dust enters an explosion-proof dust removal system (6) at the top; the separated pellets enter a vibration screening machine (22) at the bottom; the lower end of the vibration screening machine (22) is connected to a waste box, and the side end is connected to a storage hopper (16); after vibration screening, pellets that do not meet the mesh size are ensured to enter the waste box, and qualified pellets are returned to the storage hopper (16) for continuous recycling.

4. The paint stripping device for the surface paint layer of aircraft forgings and castings according to claim 1 is characterized in that: The explosion-proof dust removal system (6) comprises a cyclone separator (21), a dust suction pipe (24), a dry explosion-proof filter element dust collector (25), a dust collecting box, a wet liquid explosion-proof dust collector (26), and a dust exhaust pipe (27); the cyclone separator (21) is arranged at the top of the system, and after the recovered pellets and dust are separated, the dust-containing air enters the dry explosion-proof filter element dust collector (23) through the dust suction pipe (24) and is filtered by multiple filter elements, and the exhaust air enters the wet liquid explosion-proof dust collector (26) through the dust suction pipe (24) and is filtered again before being discharged through the dust exhaust pipe 27, thereby ensuring that the exhaust dust volume meets the direct emission standard.

5. The paint stripping equipment for the paint layer on the surface of aircraft forgings and castings according to claim 1 is characterized in that: The cyclone separator (21) is a conical cylinder made of thick steel plate and wear-resistant lining steel plate. The upper section of the cylinder is a cylinder. A square air inlet connected to the sand return pipe (23) is installed in the tangential direction of the upper section. A rectangular air outlet connected to the dry explosion-proof filter element dust collector (23) is installed at the top of the cylinder. The lower section of the cylinder is a cone and is connected to the vibrating screening machine (22). The cyclone separator (21) separates dust particles.

6. The paint stripping equipment for the surface paint layer of aircraft forgings and castings according to claim 1 is characterized in that: The dry explosion-proof filter element dust collector (23) is a box body made of thick steel plates and brackets. The upper part of the box body is a rectangular parallelepiped, which is divided into two cavities, an air inlet and an air outlet. N explosion-proof dust filter elements are installed inside the air inlet cavity. A circular air inlet is installed at the top and is connected to the air outlet of the cyclone separator (21). The bottom is a conical dust collecting hopper connected to the dust collecting box; the air outlet cavity is connected to the inner hole of the explosion-proof dust filter element, and an air outlet is installed at the top and is connected to the wet liquid explosion-proof dust collector (26). The dry explosion-proof filter element dust collector (23) separates dust particles.

7. The paint stripping device for the paint layer on the surface of aircraft forgings and castings according to claim 1 is characterized in that: The wet liquid explosion-proof dust collector (24) is a box made of stainless steel plates and brackets. The upper part of the box is equipped with a fan and an air outlet, the lower part is a water storage area, the side is provided with an overflow port and a sewage outlet, and the bottom of the box is provided with a water tank. The wet liquid explosion-proof dust collector (24) controls the dust concentration of the air at the air outlet to 3 mg / m by the adsorption and condensation effect of spraying water mist. 3 Within.

8. A method for removing paint from the surface of aircraft forgings and castings, characterized in that: Methods include: Step 1: Turn on the power of the equipment on the control cabinet (3), open the door of the working cabin (2), and press the trolley exit button on the control cabinet (3); Step 2: After the electric trolley turntable (1) stops moving out of the chamber, clamp the parts to be stripped onto the work surface, and press the trolley entry button on the control cabinet (3); Step 3: After the electric trolley turntable (1) stops entering the cabin, the resin pellets are loaded into the bucket-type honeycomb floor (20) and the door of the working cabin (2) is closed; Step 4: After adjusting the shot flow rate of the flow valve (18), set the working parameters on the touch screen (15) and control two working modes, including automatic mode and manual mode, through the working mode knob on the front of the working cabin (2).

9. The method according to claim 8, characterized in that The automatic mode is as follows: the electric trolley turntable (1) drives the parts to rotate together by stepping on the pedal switch (19), and the spray gun (12) outputs resin pellets to the surface of the parts at a fixed angle and distance at a set pressure to automatically blast and depaint, and stops working after the blasting time is reached. The depainting condition can also be observed through the observation window (14) during the process, and the depainting work can be stopped by stepping on the pedal switch (19) as appropriate; after the depainting is completed, the door of the working cabin (2) is opened, and the trolley exit button on the control cabinet (3) is pressed. After the electric trolley turntable (1) stops exiting the cabin, the parts are removed to complete the depainting of the parts. If it is necessary to remove the paint layer on the surface of other parts, they are re-clamped and the above process is repeated. If all the work is completed, the trolley entry button on the control cabinet (3) is pressed. After the electric trolley turntable (1) stops entering the cabin, the door of the working cabin (2) is closed, and the power supply of the equipment is turned off on the control cabinet (3) to complete the entire depainting work.

10. The method according to claim 8, characterized in that The manual mode is as follows: the pedal switch (19) is pressed and held to start, the electric trolley turntable (1) drives the parts to rotate together, the worker holds the spray gun (12) through the glove opening (13) and adjusts the spray angle and distance as needed, outputs resin pellets to the surface of the parts at a set pressure to perform manual shot blasting and paint stripping, and observes the paint stripping status in real time through the observation window (14), and releases the pedal switch (19) as needed to stop the paint stripping work; after the paint stripping is completed, the door of the working cabin (2) is opened, and the trolley exit button on the control cabinet (3) is pressed, and after the electric trolley turntable (1) stops exiting the cabin, the parts are removed to complete the paint stripping of the parts; if it is necessary to remove the paint layer on the surface of other parts, they are re-clamped and the above process is repeated; if all the work is completed, the trolley entry button on the control cabinet (3) is pressed, and after the electric trolley turntable (1) stops entering the cabin, the door of the working cabin (2) is closed, and the power supply of the equipment is turned off on the control cabinet (3) to complete the entire paint stripping work.

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