Automatic positioning device for paint spraying in paint spraying room

Abstract

The utility model relates to the technical field of furniture production, in particular to an automatic positioning device for paint spraying of a paint spraying room, which comprises a main frame mechanism, a paint spraying mechanism is arranged at the upper end in the main frame mechanism, and a supporting mechanism is arranged at the lower end in the main frame mechanism. When movable spraying needs to be carried out, a power source of a motor is switched on, forward and reverse rotation of the motor is controlled through a forward and reverse rotation switch, a rotating shaft is driven, the rotating shaft can drive a threaded rod to rotate synchronously, a threaded sleeve drives a connecting table to move, and horizontal movement of the connecting table can be achieved by sliding a limiting sleeve on the surface of a limiting rod; the distance sensor can drive the paint pump, the paint spraying pipe and all the paint spraying heads to move, positioning covering spraying is achieved, the distance sensor can serve as an induction structure for starting spraying and can also serve as an induction structure for stopping spraying, and therefore the effect of automatic positioning spraying is achieved.

Description

Technical Field

[0001] This utility model relates to the field of furniture manufacturing technology, and specifically discloses an automatic positioning device for spray painting in a spray booth. Background Technology

[0002] A furniture panel spray booth is a specially designed enclosed or semi-enclosed space for spraying furniture panels, aiming to provide a safe and efficient spraying environment and ensure spraying quality. These spray booths are widely used in the furniture manufacturing industry for spraying various types of wood, metal, and composite materials.

[0003] For example, the utility model with authorization announcement number CN216025799U discloses a paint booth for automated painting of semi-trailer chassis, relating to the field of paint booth technology. This utility model includes a support device, a rotating device, a painting device, a positioning device, and a ventilation device. The support device includes a base plate, side plates, and a rotating seat. The rotating device includes a rotating motor and a driven shaft, with the driven shaft rotatably engaging with the rotating seat. The lower surface of the rotating motor is connected to the lower surface of the base plate. The painting device includes a moving track, which rotatably engages with driven wheels. The positioning device also includes a support plate, with the lower surface of the support plate connected to the upper surface of the side plates. The ventilation device includes a sealing plate, with one surface of the side plates connected to one surface of the sealing plate. This utility model, an automated paint booth for semi-trailer chassis painting, enables automated painting by setting up a moving track, a sprayer, and paint nozzles, allowing for remote control during the painting process. Currently, when painting furniture panels, some panels are used in the cabinet or box structure, so only one side needs to be painted. When these panels are painted on one side in the paint booth, because the panel specifications of a set of furniture pieces are different, if the painting configuration is uniform, the spraying position needs to be frequently adjusted and moved when painting a large area of ​​panels. When painting a small area of ​​panels, it is easy to cause some nozzles to spray dry, which causes unnecessary waste of paint. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide an automatic positioning device for spray painting in a spray booth, so as to solve the problem of positioning the position of the board and the spraying position according to the size of the board when spraying a single side of a set of furniture boards of different specifications.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an automatic positioning device for spraying paint in a spray booth, comprising a main frame mechanism, a spraying mechanism being provided at the upper end of the main frame mechanism, and a support mechanism being provided at the lower end of the main frame mechanism.

[0006] Furthermore, the main frame mechanism includes a base, a room box is provided on top of the base, the opening of the room box is covered by a door panel, and a handle lock is provided on the front of the door panel located on one side.

[0007] An air inlet is installed through one side of the room box, and an exhaust outlet is installed through the other end of the room box;

[0008] Several cylinders are installed through the top of the housing. Inside each cylinder is a piston rod for extension and retraction. A lifting plate is installed at the end of the piston rod, and a hollow hole is opened in the middle of the lifting plate.

[0009] Furthermore, the painting mechanism includes a motor, and the motor has a drive shaft inside. The end of the motor shaft is provided with a threaded rod, and the end of the threaded rod away from the motor is rotatably provided with a rod seat. The surface of the threaded rod is also provided with a connecting platform, and a threaded sleeve is provided through the connecting platform. The inside of the threaded sleeve and the surface of the threaded rod are threadedly connected to each other.

[0010] Furthermore, a limiting seat is provided below the lifting plate, and a limiting rod is rotatably provided inside the limiting seat. A limiting sleeve is provided through the connection position between the connecting platform and the limiting rod, and the inside of the limiting sleeve is slidably sleeved with the surface of the limiting rod.

[0011] Furthermore, a paint pump is installed above the recessed position of the connecting platform. A transition pipe one is connected to the flange at the outlet position of the paint pump, and a transition pipe two is connected to the flange at the inlet position of the paint pump. A transition pipe three is installed through the top of the chamber. A flexible hose is installed between transition pipe two and transition pipe three.

[0012] Furthermore, a paint spraying pipe is provided at the lower end of the first transition pipe, a central paint spraying head is provided through the middle of the lower end of the paint spraying pipe, and side paint spraying heads are provided through the lower ends of the paint spraying pipe respectively. A solenoid valve is provided between the central paint spraying head and the side paint spraying head.

[0013] Furthermore, a mounting plate is provided at the lower end of the outer ring wall of the paint spraying tube, and a distance sensor is provided at the lower end of the mounting plate;

[0014] The mounting plate has an inner sleeve running through both sides. The outer wall of the paint spray tube has a threaded post, which is nested with the inner sleeve. The threaded post has a threaded cap on its surface.

[0015] Furthermore, the support mechanism includes a shelf, and the lower end of the shelf has a plurality of feet distributed thereon.

[0016] A guide rail sub-rail is provided between the gaps of the base feet, and a guide rail sub-slide is slidably mounted on the guide rail sub-rail. A positioning plate is fixed at the upper end of the guide rail sub-slide. A strip hole is opened on the surface of the shelf, penetrating through its interior. The surface of the positioning plate is slidably and tightly attached to the inner side of the strip hole.

[0017] The working principle and beneficial effects of this solution are as follows: 1. When it is necessary to spray paint one side of the furniture panel, open the door panel so that the panel can be placed on the shelf. Then, the positioning plate can be moved by sliding the guide rail slide on the guide rail. By moving the two positioning plates in the same horizontal position in opposite directions synchronously, the panel to be painted can be positioned in the middle of the shelf, thus ensuring the stability of the positioning during the painting process. Then, by extending and retracting the piston rod of the cylinder, the lifting plate can be moved up and down, thereby adjusting the height of the middle spray head and the edge spray head, so that the distance between them and the panel to be painted is adjustable.

[0018] 2. Under the control of the central processing unit, the distance sensor can be activated. The distance sensor in the middle position can detect the placement of the part to be painted. Then, the central processing unit can start the paint pump, which can draw in external paint through the transition pipe 2, hose and transition pipe 3, and send it into the transition pipe 1. Finally, it is sent into the interior of the paint spray pipe. Through the diversion effect of the paint spray pipe, it can be sprayed from the middle spray head and the edge spray head. When the distance sensor at the edge position does not detect a change in value, the solenoid valve will remain closed, thereby preventing the paint from being sprayed out through the edge spray head and causing dry spraying, thus achieving the effect of saving paint.

[0019] 3. When mobile spraying is required, turn on the motor power and control the forward and reverse rotation of the motor through the forward and reverse switch, so that the shaft can drive the threaded rod to rotate synchronously, allowing the threaded sleeve to move with the connecting table. By sliding the limit sleeve on the surface of the limit rod, the connecting table can be moved horizontally, thereby moving the paint pump, paint pipe and each paint head to achieve positioning and coverage spraying. The distance sensor can not only serve as the sensing structure for starting spraying, but also as the sensing structure for ending spraying, thus achieving the effect of automatic positioning spraying.

[0020] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0021] Figure 1 This is a schematic diagram showing the distribution of the various mechanisms in the embodiment;

[0022] Figure 2 This is a schematic diagram of the overall structure of the embodiment;

[0023] Figure 3 This is a schematic diagram of the internal structure of an embodiment;

[0024] Figure 4 A bottom view of the positions of the connecting platform and the lifting plate in this embodiment;

[0025] Figure 5 This is a schematic diagram showing the distribution of the paint spray pipes and various spray nozzles in an embodiment.

[0026] Figure 6 This is a schematic diagram illustrating the connection between the mounting plate and the distance sensor and the paint spray pipe in an embodiment.

[0027] Figure 7 This is a schematic diagram showing the distribution of each transition tube in the embodiment;

[0028] Figure 8 The diagram illustrates the working principle of the distance sensor, motor, paint pump, solenoid valve, and central processing unit used in this embodiment.

[0029] The following are labeled in the attached diagram: 1. Main frame mechanism; 2. Painting mechanism; 3. Support mechanism; 10. Base; 11. Chamber box; 12. Door panel; 13. Handle lock; 14. Air inlet; 15. Air outlet; 17. Cylinder; 18. Lifting plate; 19. Hole; 20. Motor; 21. Threaded rod; 22. Rod seat; 23. Connecting platform; 24. Threaded sleeve; 25. Limit seat; 26. Limit rod; 27. Limit sleeve; 2001. Paint pump; 2002. Transition pipe 1. 2003. Transition pipe 2. 2004. Hose. 2005. Transition pipe 3. 2006. Spray painting pipe. 2007. Central spray painting head. 2008. Solenoid valve. 2009. Side spray painting head. 2010. Mounting plate. 2011. Distance sensor. 2012. Internal sleeve. 2013. Threaded cap. 2014. Threaded post. 30. Shelf plate. 31. Foot. 32. Guide rail pair guide rail. 33. Guide rail pair slide. 34. Strip hole. 35. Positioning plate. Detailed Implementation

[0030] The following detailed description illustrates the specific implementation method:

[0031] Example

[0032] like Figures 1 to 8 As shown, an automatic positioning device for spraying paint in a spray booth is disclosed, including a main frame mechanism 1, a spraying mechanism 2 is provided at the upper end of the main frame mechanism 1, and a support mechanism 3 is provided at the lower end of the main frame mechanism 1.

[0033] The main frame structure 1 includes a base 10, above which is a chamber 11. The chamber 11 has a single opening structure, and its lower end is fixed to the surface of the base 10 with screws. The opening of the chamber 11 is covered by a door panel 12, which is a double-door structure. The rotating end of the door panel 12 is hinged to the opening end of the chamber 11 via a door hinge. A handle lock 13 is provided on the front of the door panel 12 located on one side. The handle lock 13 can stably close the two door panels 12 of the double-door structure when closed. An air inlet 14 is provided through one side of the chamber 11. The connection between the air inlet 14 and the chamber 11 is fixed with sealant. The end of the air inlet 14 can be connected to a fresh air system through an air duct for supplying clean, dust-free fresh air to the interior of the chamber 11 during painting processes. The other end of the chamber 11 is provided with an exhaust port 15. The connection between the exhaust port 15 and the chamber 11 is fixed with sealant. The end of the exhaust port 15 can be connected to a waste gas treatment device through a duct, which can purify the air containing harmful gases during the paint spraying ventilation. Several cylinders 17 are provided through the top of the chamber 11. The outer wall of the cylinders 17 is fixedly assembled to the top of the chamber 11 by a bracket. The cylinders 17 are distributed in two rows. The inside of the cylinders 17 is provided with a piston rod for extension and retraction. The end of the piston rod is provided with a lifting plate 18. The upper end of the lifting plate 18 is fixedly assembled to the end of the piston rod by screws. A hollow hole 19 is opened in the middle of the lifting plate 18. By extending and retracting the piston rod of the cylinder 17, the lifting plate 18 can move up and down stably inside the chamber 11.

[0034] The painting mechanism 2 includes a motor 20. The outer ring wall of the motor 20 is fixed to the lower end of the lifting plate 18 by a bracket. The motor 20 has a drive shaft inside. The motor 20 is a servo type and has a forward and reverse switch connected to it by wires. The forward and reverse switch is model HY2-8. The end of the motor 20 shaft is provided with a threaded rod 21. One end of the threaded rod 21 is fixedly connected to the shaft by a coupling. The end of the threaded rod 21 away from the motor 20 is rotatably provided with a rod seat 22. The upper end of the outer ring wall of the rod seat 22 is fixedly assembled to the surface of the lifting plate 18 by a bracket. The surface of the threaded rod 21 is also provided with a connecting platform 23. A threaded sleeve 24 is provided through the connecting platform 23. The connection position between the threaded sleeve 24 and the connecting platform 23 is fixed by welding. The inside of the threaded sleeve 24 and the surface of the threaded rod 21 are threadedly connected to each other. The middle part of the connecting platform 23 is a concave structure.

[0035] A limiting seat 25 is provided below the lifting plate 18. The exterior of the limiting seat 25 is fixedly assembled to the surface of the lifting plate 18 via a bracket. A limiting rod 26 is rotatably provided inside the limiting seat 25. The surface of the limiting rod 26 penetrates the interior of the connecting platform 23. A limiting sleeve 27 is provided at the connection position between the connecting platform 23 and the limiting rod 26. The connection between the limiting sleeve 27 and the connecting platform 23 is fixed by welding. The interior of the limiting sleeve 27 is slidably sleeved with the surface of the limiting rod 26. A set of structures such as the threaded rod 21 and the limiting rod 26 are distributed on each side of the connecting platform 23. When it is necessary to move the connecting platform 23 horizontally, the power supply of the motor 20 is turned on, and the forward and reverse rotation of the motor 20 is controlled by the forward and reverse switch, which drives the shaft. The shaft can drive the threaded rod 21 to rotate synchronously, allowing the threaded sleeve 24 to move the connecting platform 23. The horizontal movement of the connecting platform 23 can be achieved by the limiting sleeve 27 sliding on the surface of the limiting rod 26.

[0036] A paint pump 2001 is installed above the recessed position of the connecting platform 23. The lower end of the paint pump 2001 is fixedly assembled to the surface of the connecting platform 23 via a bracket. A transition pipe 2002 is connected to the flange at the outlet of the paint pump 2001, and the transition pipe 2002 passes through the connecting platform 23. A transition pipe 2003 is connected to the flange at the inlet of the paint pump 2001, and the transition pipe 2003 passes through the perforated hole 19. A transition pipe 2005 is installed through the top of the housing 11. The connection between 05 and the housing 11 is fixed with screws. The transition pipe 3 2005 is mainly used to connect with the external paint container. The paint can be pumped in by the suction effect of the paint pump 2001. A hose 2004 is provided between the transition pipe 2 2003 and the transition pipe 3 2005. The hose 2004 is long enough and its two ends are respectively connected to the flange of the corresponding transition pipe. The hose 2004 can move on the connecting platform 23 to provide sufficient length to cooperate with the displacement of the paint pump 2001.

[0037] A paint spray pipe 2006 is installed at the lower end of the transition pipe 2002. The transition pipe 2002 and the paint spray pipe 2006 are fixedly connected at the middle position. A central paint spray head 2007 is installed at the middle position of the lower end of the paint spray pipe 2006. The connection between the central paint spray head 2007 and the paint spray pipe 2006 is fixed by welding. Side paint spray heads 2009 are installed on both sides of the lower end of the paint spray pipe 2006. The connection between the side paint spray heads 2009 and the paint spray pipe 2006 is fixed by welding. The central paint spray head 2007 and the side paint spray head 2009 are located at the middle position. A solenoid valve 2008 is installed between the spray nozzles 2009 and the spray nozzle 2006. The valve core of the solenoid valve 2008 is embedded inside the spray nozzle 2006. The spray nozzle 2006 is mainly used to divert the paint delivered by the paint pump 2001 and then spray it out through the spray nozzles at different positions. According to the size of the board, the paint delivery distance can be controlled by the solenoid valve 2008. Thus, the edge spray nozzles 2009 can be opened and closed as needed. Therefore, when spraying small boards, paint can be saved and dry spraying can be avoided.

[0038] A mounting plate 2010 is installed at the lower end of the outer ring wall of the spray pipe 2006. A distance sensor 2011 is installed at the lower end of the mounting plate 2010. There are three sets of distance sensors 2011, one of which is located directly below the spray pipe 2006, and the other two sets are located on both sides of the lower end of the spray pipe 2006. The middle distance sensor 2011 can perform positioning sensing when the part to be sprayed is placed on the placement plate 30. The distance sensors 2011 on both sides can sense the size of the part. If the distance does not change, the solenoid valve 2008 is not opened, and the single-sided spraying coverage of the part can be achieved by relying solely on the middle spray head 2007. Otherwise, the edge spray head 2009 needs to be used to expand the spraying range. When the connecting table 23 moves horizontally, the middle spray head 2007 can be used to achieve the same spraying range. The painting process involves the moving spray head 2007 and the edge spray head 2009. When the distance sensor 2011 moves, it can also sense the range of forward and backward movement. In short, as long as the distance sensor 2011 changes vertically, paint needs to be sprayed through the spray head. A central processing unit is set in the working area. The central processing unit is connected to the distance sensor 2011, the solenoid valve 2008, the paint pump 2001 and the motor 20 through power transmission lines. The distance sensor 2011 in the middle position and the distance sensor 2011 at the edge position are independently connected to the central processing unit. When the distance sensor 2011 at the edge position senses a change, it will not only cause the central processing unit to control the paint pump 2001 to work, but also open the solenoid valve 2008.

[0039] An inner sleeve 2012 is provided through both sides of the mounting plate 2010. The inner sleeve 2012 is fixed to the mounting plate 2010 by welding. A threaded post 2014 is provided on the outer wall of the paint spray tube 2006. One end of the threaded post 2014 is welded to the surface of the paint spray tube 2006. The threaded post 2014 and the inner sleeve 2012 are interlocked. A threaded cap 2013 is threadedly mated to the surface of the threaded post 2014. The end face of the threaded cap 2013 is tightly fitted to the end face of the inner sleeve 2012. Several knobs are provided on the outer ring wall of 13. One end of the knob is welded to the surface of the threaded cap 2013. When it is necessary to disassemble, clean or replace the distance sensor 2011, the threaded cap 2013 can be rotated by the knob, so that the threaded cap 2013 can be separated from the threaded post 2014. Thus, the threaded post 2014 can be disengaged from the inner sleeve 2012, thereby separating the mounting plate 2010 from the paint spray tube 2006, and then removing the distance sensor 2011. It can be operated directly by hand, which is simple and convenient.

[0040] The support mechanism 3 includes a shelf 30, which is placed above the base 10. Several feet 31 are distributed at the lower end of the shelf 30. The upper and lower ends of the feet 31 are fixed to the surfaces of the shelf 30 and the base 10 respectively by screws. A secondary guide rail 32 is provided between the feet 31, with one set of secondary guide rails 32 arranged on each of the lower sides of the shelf 30. A secondary guide rail slide 33 slides slidably on the secondary guide rail 32, and a positioning plate 35 is fixed to the upper end of the secondary guide rail slide 33. A through-hole is formed on the surface of the shelf 30. The internal slot 34 and the surface of the positioning plate 35 are slidably and tightly attached to the inner side of the slot 34. When the painted panel is placed on the shelf 30, it can slide on the guide rail 32 via the guide rail slide 33, which can realize the movement of the positioning plate 35. By moving the two positioning plates 35 in the same lateral position in opposite directions synchronously, the painted panel can be positioned in the middle position of the shelf 30, thereby ensuring the positioning stability during the painting process. The guide rail 32 and the guide rail slide 33 form a linear guide rail pair structure, which can ensure the stable movement of the positioning plate 35.

[0041] In practice

[0042] When it is necessary to spray paint one side of the furniture panel, open the door panel 12 so that the panel can be placed on the shelf 30. Then, the positioning plate 35 can be moved by sliding the guide rail sub-slide 33 on the guide rail sub-guide rail 32. By moving the two positioning plates 35 in the same horizontal position in opposite directions synchronously, the panel to be painted can be positioned in the middle position of the shelf 30, thereby ensuring stable positioning during the painting process. Then, by extending and retracting the piston rod of the cylinder 17, the lifting plate 18 can be moved up and down, thereby adjusting the height of the middle spray head 2007 and the side spray head 2009, so that the distance between them and the panel to be painted is adjustable.

[0043] Controlled by the central processing unit, the distance sensor 2011 can be activated. The distance sensor 2011 in the middle position can detect the placement of the part to be painted. Then, the central processing unit can activate the paint pump 2001, which can draw in external paint through the transition pipe 2003, hose 2004 and transition pipe 3 2005, and send it into the transition pipe 1 2002. Finally, it is sent into the paint spray pipe 2006. Through the diversion effect of the paint spray pipe 2006, the paint can be sprayed from the middle paint head 2007 and the edge paint head 2009. When the distance sensor 2011 at the edge position does not detect a change in value, the solenoid valve 2008 is kept closed, thereby preventing the paint from being sprayed out through the edge paint head 2009 and causing dry spraying, thus achieving the effect of saving paint.

[0044] When mobile spraying is required, the power supply of motor 20 is turned on, and the forward and reverse rotation of motor 20 is controlled by the forward and reverse switch, which drives the shaft. The shaft can drive the threaded rod 21 to rotate synchronously, allowing the threaded sleeve 24 to move with the connecting table 23. By sliding the limiting sleeve 27 on the surface of the limiting rod 26, the connecting table 23 can be moved horizontally. Thus, the paint pump 2001, the paint pipe 2006 and each paint head can be moved to achieve positioning and coverage spraying. The distance sensor 2011 can not only be used as a sensing structure for starting spraying, but also as a sensing structure for ending spraying, thereby achieving the effect of automatic positioning spraying.

[0045] When it is necessary to disassemble, clean, or replace the distance sensor 2011, the threaded cap 2013 can be rotated by the knob, so that the threaded cap 2013 can be separated from the threaded post 2014. This allows the threaded post 2014 to be disengaged from the inner sleeve 2012, thereby separating the mounting plate 2010 from the paint spray tube 2006. Then, the distance sensor 2011 can be removed manually, which is simple and convenient.

[0046] The above description is merely an embodiment of this utility model, and common knowledge such as specific structures and characteristics in the solution is not described in detail here. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these should also be considered within the protection scope of this utility model. These modifications and improvements will not affect the effectiveness of the implementation of this utility model or its practicality.

Claims

1. An automatic positioning device for paint spraying in a paint spray booth, characterized by: Including the main frame mechanism, the inside upper end of the main frame mechanism is provided with a paint spraying mechanism, and the inside lower end of the main frame mechanism is provided with a supporting mechanism; The paint spraying mechanism comprises a motor, a rotating shaft is arranged in the motor for driving, a threaded rod is arranged at the end of the rotating shaft of the motor, a rod seat is rotatably arranged at one end of the threaded rod away from the motor, a connecting table is further arranged on the surface of the threaded rod, a threaded sleeve is arranged in the connecting table, and the inside of the threaded sleeve is threadedly connected with the surface of the threaded rod; A paint pump is arranged above the lower concave position of the connecting table, a transition pipe one is flange-connected to the outlet of the paint pump, a transition pipe two is flange-connected to the inlet of the paint pump, and a transition pipe three is arranged on the top of the cabinet; A paint spraying pipe is arranged at the lower end of the transition pipe one, a middle paint spraying head is arranged at the middle position of the lower end of the paint spraying pipe, side paint spraying heads are arranged at both sides of the lower end of the paint spraying pipe, and an electromagnetic valve is arranged between the middle paint spraying head and the side paint spraying heads. A mounting plate is arranged at the lower end of the outer wall of the paint spraying pipe, a distance sensor is arranged at the lower end of the mounting plate, built-in sleeves are arranged at both sides of the mounting plate, threaded columns are arranged on the outer wall of the paint spraying pipe, the threaded columns are sleeved with the built-in sleeves, and threaded caps are threadedly connected with the surfaces of the threaded columns.

2. An automatic positioning device for use in a paint spray booth according to claim 1, characterized in that: The main frame mechanism comprises a base, a cabinet is arranged above the base, a door plate covers the opening of the cabinet, and a handle lock is arranged on the front of the door plate on one side; An air inlet is arranged on one side of the cabinet, and an air outlet is arranged on the other end of the cabinet; A plurality of air cylinders are arranged on the top of the cabinet, a piston rod is arranged in each air cylinder for telescopic movement, a lifting plate is arranged at the end of the piston rod, and a hollow hole is arranged at the middle position of the lifting plate.

3. An automatic positioning device for use in a paint spray booth according to claim 2, characterized in that: A limiting seat is arranged below the lifting plate, a limiting rod is rotatably arranged in the limiting seat, a limiting sleeve is arranged in the connecting table and the connecting position of the limiting rod, and the inside of the limiting sleeve is slidably connected with the surface of the limiting rod.

4. The automatic positioning device for paint spraying in a paint spray booth according to claim 3, wherein: The supporting mechanism comprises a storage plate, and a plurality of feet are arranged at the lower end of the storage plate; A guide rail pair is arranged between the gaps of the feet, a guide rail pair sliding seat is slidably arranged on the guide rail pair, a positioning plate is fixedly arranged at the upper end of the guide rail pair sliding seat, a strip-shaped hole is arranged on the surface of the storage plate and penetrates the inside of the storage plate, and the surface of the positioning plate is slidably and tightly arranged with the inner side of the strip-shaped hole.

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