A surface spraying device for bolt ball grid rods

Abstract

The present invention relates to the field of paint spraying technology, and specifically discloses a bolt ball grid rod surface spraying device, wherein a cover shell is rotatably installed at the front end of a spray nozzle and can be buckled at the paint spray hole of the spray nozzle, a guide rod is slidably installed in the interior of a spray gun body back and forth, a rear end of the guide rod is connected to a switch, and a front end is connected to the cover shell, a telescopic container is arranged in the spray gun body, a rear end of the telescopic container is fixedly connected to the spray gun body, and a front end is fixedly connected to the guide rod, a suction shell is arranged on one side of the paint spray hole of the spray nozzle, and a suction hole is provided on the side of the suction shell facing the spray nozzle, the suction shell is connected to the telescopic container, and a one-way valve 1 is provided at the connection point for gas to enter the telescopic container, and a one-way valve 2 is also provided on the telescopic container for gas in the telescopic container to be discharged; the present invention can suck the paint liquid remaining near the paint spray hole into the suction shell, can effectively prevent paint dripping, and can avoid spraying the solidified paint near the paint spray hole on the rod, affecting the quality of the rod.

Description

Technical Field

[0001] The invention relates to the technical field of spray painting, in particular to a surface spraying device for a bolt ball grid frame rod. Background Art

[0002] The bolted-ball lattice is a spatial steel structure system that connects hollow steel ball nodes with steel tube members using high-strength bolts to form a stable three-dimensional lattice structure. Its core feature is its modular design, making it suitable for scenarios such as stadiums, theaters, conference centers, airport terminals, high-speed rail station canopies, large factories, and warehouses and logistics centers. Due to its high efficiency, lightweight, and scalability, it has become the preferred structural form for modern large-span buildings.

[0003] The patent document with authorization announcement number CN116764844B discloses a paint spraying device for automobile injection molded parts, including a spray gun body, a paint trigger is provided on the rear side of the spray gun body; a drive gear is provided on the paint trigger; the drive gear and the rotation base point of the paint trigger are consistent; a valve needle is provided on the spray gun body; a buffer groove is provided on the valve needle, which can automatically open the anti-drip cover structure composed of an anti-drip collection part and an anti-drip opening and closing plate when the paint trigger is manually pulled to pre-spray paint, thereby facilitating the completion of painting, and when the paint trigger is released, the anti-drip cover structure can be restored to prevent residual paint from dripping. In this way, the two structures are linked together, which improves the convenience of using the paint spraying device and solves the problem that when the paint spraying device stops spraying, some residual paint liquid is easy to drip from the nozzle position of the paint spraying device, which easily causes residual paint to drip onto the injection molded parts or the ground.

[0004] However, although the above technical solution solves the problem that the residual paint liquid is easy to drip onto the pole or the ground, some paint liquid will still remain at the paint spray hole. When the pole is actually sprayed with paint, a complete painting operation may be paused due to various factors. At this time, the paint liquid remaining in the paint spray hole will solidify. When spraying next time, the high-pressure gas ejected from the spray gun body will cause the solidified paint to be sprayed onto the surface of the pole, which will affect the spraying quality. Summary of the Invention

[0005] The present invention provides a bolt ball grid rod surface spraying device, which aims to solve the problem in the related art that high-pressure gas sprayed from the spray gun body may cause the paint solidified at the spray hole to be sprayed onto the rod surface, affecting the spraying quality.

[0006] A bolt ball grid rod surface spraying device includes a spray gun body, a nozzle is provided at the front end of the spray gun body, and a switch for controlling paint spraying is also provided on the spray gun body, and also includes a cover, a guide rod and a suction assembly, the cover is rotatably mounted on the front end of the spray head and can be buckled at the paint spraying hole of the spray head, the guide rod is slidably mounted inside the spray gun body, the rear end of the guide rod is connected to the switch, and the front end is connected to the cover through a transmission assembly, so that when the control switch is controlled to spray, the cover can be rotated downward to open the paint spraying hole of the spray head, and when the control switch stops spraying, the cover can be The suction assembly includes a telescopic container and a suction shell, the telescopic container is provided in the spray gun body and can be telescoped in the front and rear directions, the rear end of the telescopic container is fixedly connected to the spray gun body, and the front end is fixedly connected to the guide rod, the suction shell is provided on one side of the paint spray hole on the spray head, and the suction hole is provided on the side of the suction shell facing the spray head, the suction shell is connected with the telescopic container, and a one-way valve is provided at the connection point to allow gas to enter the telescopic container, and a one-way valve is also provided on the telescopic container to discharge the gas in the telescopic container.

[0007] The beneficial effects of the present invention are as follows: when the paint spraying device of the present invention finishes a painting session, the cover shell can be rotated upward and snapped onto the paint spray hole of the nozzle, and at the same time the telescopic container will gradually extend, and air can be sucked into the telescopic container through the one-way valve 1 and the suction hole of the suction shell, that is, the paint liquid remaining near the paint spray hole can be sucked into the suction shell, which can effectively prevent paint dripping, and at the same time, it can prevent paint from remaining near the paint spray port and solidifying. During the next spraying, the solidified paint remaining at the paint spray hole can be prevented from being sprayed onto the rod, affecting the quality of the rod. In addition, when performing the next painting, the cover shell will first slide down a certain distance, and then rotate to open the paint spray hole. During this process, the airflow first ejected from the paint spray hole will blow off the solidified paint inside the paint spray hole and blow it into the cover shell, which can prevent the solidified paint in the oil outlet pipe inside the paint spray hole from being sprayed onto the rod and affecting the quality of the rod.

[0008] Preferably, the transmission assembly includes a gear and a rack that can mesh with each other, the rack is located below the gear, the gear is coaxially fixedly connected to the rotation center of the cover and the nozzle, and the rack is fixedly connected to the guide rod. The effect is that through the meshing of the gear and the rack, when the guide rod is controlled to move back and forth, it is convenient to control the rotation of the cover.

[0009] Preferably, the rear end of the guide rod is fixedly connected to a stopper, the switch is an electric push rod, and the bottom end of the stopper is connected to the telescopic end of the switch.

[0010] Preferably, a push piece is installed in the nozzle for sliding back and forth, the push piece is located on the rear side of the rack and is fixedly connected to the guide rod, the side of the push piece facing the cover shell is an inclined surface, and when the cover shell is buckled at the paint spray hole of the nozzle, the bottom end of the inclined surface is located below the bottom end of the cover shell, which has the effect that when the guide rod is controlled to move forward, the push piece can facilitate the cover shell to move upward.

[0011] Preferably, the suction shell is slidably connected to the nozzle, and the direction in which the suction shell can slide is the same as the direction of the central axis of rotation of the cover shell. The suction shell is provided with a slide groove 1 extending up and down, and a slide rod is slidably connected in the slide groove 1. The nozzle is provided with a slide groove 2, one end of the slide groove 2 is connected to the slide groove 1, and the other end is inclined upward. The upper end of the slide rod is slidably fitted in the slide groove 2, and the upper end of the slide rod is provided with a slot for the cover shell to be plugged in.

[0012] Preferably, the cover shell is rotatably connected to the nozzle through a rotating shaft, and shaft sleeves are rotatably installed at both ends of the rotating shaft. The shaft sleeves are slidably connected to the nozzle head up and down, and an elastic member is provided between the shaft sleeve and the nozzle head. When the cover shell moves upward, the elastic member can apply a downward pulling force to the cover shell, which has the effect that when the push member is detached from the bottom of the cover shell, the cover shell can easily move downward and return to its original position under the pull of the elastic member.

[0013] Preferably, a sponge adsorption member 1 is provided in the suction shell, and its effect is that the sponge adsorption member 1 can adsorb the paint sucked in from the suction hole.

[0014] Preferably, a second sponge adsorption component is provided in the cover shell, and its effect is that the second sponge adsorption component can absorb the paint sprayed from the paint spraying hole.

[0015] Preferably, it further comprises a lifting frame, on which the spray gun body is slidably mounted up and down, and the lifting frame is provided with a driving mechanism for driving the spray gun body to move up and down.

[0016] Preferably, the telescopic container includes a front plate, a rear plate, and an annular telescopic member fixedly connected between the front plate and the rear plate, and the telescopic container is provided with a receiving groove extending forward from the rear plate to the front plate, and the receiving groove is isolated from the internal space of the telescopic container.

[0017] By adopting the above technical solution, the beneficial effects of the present invention are:

[0018] The paint spraying device of the present invention can rotate the cover upwards and snap it into the paint spray hole of the nozzle when finishing a paint spraying. At the same time, the telescopic container will gradually extend, and air can be sucked into the telescopic container through the one-way valve 1 and the suction hole of the suction shell, that is, the paint liquid remaining near the paint spray hole can be sucked into the suction shell, which can effectively prevent paint dripping and at the same time prevent paint from remaining near the paint spray port and solidifying. During the next spraying, the solidified paint remaining at the paint spray hole can be prevented from being sprayed onto the rod, affecting the quality of the rod. In addition, when spraying paint for the next time, the cover will first slide down a certain distance and then rotate to open the paint spray hole. During this process, the airflow first ejected from the paint spray hole will blow off the solidified paint inside the paint spray hole and blow it into the cover, which can prevent the solidified paint in the oil outlet pipe inside the paint spray hole from being sprayed onto the rod and affecting the quality of the rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the working state of the present invention.

[0020] Figure 2 It is a schematic diagram of the working state of the present invention from above.

[0021] Figure 3 It is a schematic diagram of the installation structure of the spray gun body of the present invention.

[0022] Figure 4 It is a structural schematic diagram of the spray gun body of the present invention.

[0023] Figure 5 Schematic diagram of another structure of the spray gun body of the present invention.

[0024] Figure 6 It is a partial cross-sectional structural schematic diagram of the present invention.

[0025] Figure 7 Schematic diagram of the connection structure of the guide rod of the present invention.

[0026] Figure 8 This is a schematic diagram of the paint spray hole on the nozzle of the present invention in the open state.

[0027] Figure 9 This is a schematic diagram of the state in which the cover shell of the present invention is buckled onto the nozzle.

[0028] Figure 10 Schematic diagram of the structure of the nozzle of the present invention.

[0029] Figure 11 For the present invention Figure 10 Schematic diagram of the structure from a side view.

[0030] Figure 12 It is a schematic structural diagram of the pushing member of the present invention.

[0031] Figure 13For the present invention Figure 12 Schematic diagram of the structure from a top view.

[0032] Figure 14 It is a schematic diagram of the cross-sectional structure of the suction shell of the present invention.

[0033] Figure 15 It is a structural schematic diagram of the suction shell of the present invention.

[0034] Figure 16 For the present invention Figure 15 Schematic diagram of the structure from a side view.

[0035] Figure 17 For the present invention Figure 15 Schematic diagram of the structure from a top view.

[0036] Figure 18 Schematic diagram of the structure of the slide bar of the present invention.

[0037] Figure 19 It is a structural schematic diagram of the telescopic container of the present invention.

[0038] Figure 20 For the present invention Figure 19 Schematic diagram of the structure from a side view.

[0039] Reference numerals:

[0040] 1. Spray gun body; 11. Spray nozzle; 111. Paint spray hole; 112. Slideway 2; 12. Switch; 2. Cover; 3. Guide rod; 31. Rod 1; 32. Rod 2;

[0041] 41. Telescopic container; 411. Front plate; 412. Rear plate; 413. Annular telescopic member; 414. Accommodating groove; 42. Suction shell; 421. Suction hole; 422. Slide groove 1; 43. Slide rod; 431. Slot; 44. Trachea;

[0042] 5. Transmission assembly; 51. Gear; 52. Rack; 61. Stopper;

[0043] 71. Pushing member; 72. Rotating shaft; 73. Bushing; 74. Elastic member;

[0044] 81. Sponge adsorption part 1; 82. Sponge adsorption part 2;

[0045] 91. Lifting frame; 92. Rod. DETAILED DESCRIPTION

[0046] like Figures 1 to 20 As shown, the bolt ball grid rod surface spraying device according to an embodiment of the present invention includes a lifting frame 91, a spray gun body 1, a cover 2, a guide rod 3 and a suction component.

[0047] like Figures 1 to 4As shown, the spray gun body 1 is installed on a lifting frame 91, and the lifting frame 91 is provided with a driving mechanism for driving the spray gun body 1 to move up and down. When spraying paint on the rod 92, the driving mechanism can be used to drive the spray gun body 1 to move up and down to fully spray the rod 92. The driving mechanism is an existing mature technology and will not be elaborated on here.

[0048] A nozzle 11 is provided at the front end of the spray gun body 1, and a switch 12 for controlling paint spraying is also provided on the spray gun body 1. When spraying, the spray gun body 1 is connected to a high-pressure gas source and a paint delivery mechanism, and the paint can be driven by compressed gas to spray out through the nozzle 11. This spraying method is an existing mature technology and will not be elaborated on here.

[0049] like Figures 4 to 9 As shown, the cover shell 2 is rotatably mounted on the front end of the spray head 11 and can be buckled into the paint spray hole 111 of the spray head 11. Specifically, the side of the bottom end of the cover shell 2 that is in contact with the spray head 11 is rotatably connected to the spray head 11 through a rotating shaft 72. The axial direction of the rotating shaft 72 is perpendicular to the front and rear directions of the spray gun body 1. Both ends of the rotating shaft 72 are rotatably mounted with shaft sleeves 73. The shaft sleeves 73 are slidably connected to the spray head 11 up and down. An elastic member 74 is provided between the shaft sleeve 73 and the spray head 11. The elastic member 74 can be a spring, and its upper and lower ends are fixedly connected to the shaft sleeve 73 and the spray head 11 respectively, so that when the cover shell 2 is buckled into the paint spray hole 111 of the spray head 11 and moves upward, the elastic member 74 can apply a downward pulling force to the shaft sleeve 73 and the cover shell 2 connected to the shaft sleeve 73.

[0050] The guide rod 3 is slidably installed inside the spray gun body 1. The rear end of the guide rod 3 is connected to the switch 12, and the front end is connected to the cover 2 through the transmission assembly 5, so that when the control switch 12 is controlled to spray, the cover 2 can be rotated downward to open the paint spray hole 111 of the nozzle 11. When the control switch 12 stops spraying, the cover 2 can be rotated upward and buckled on the nozzle 11 to block the paint spray hole 111 of the nozzle 11.

[0051] Specifically, if Figures 4 to 9 As shown, the length direction of the guide rod 3 extends in the front-to-back direction, and the rear end of the guide rod 3 is fixedly connected to a stopper 61. The switch 12 can be an electric push rod, and the bottom end of the stopper 61 is fixedly connected to the telescopic end of the switch 12. The switch 12 is controlled to be telescopic, and can drive the stopper 61 and the guide rod 3 to move in the front-to-back direction.

[0052] The transmission assembly 5 includes a gear 51 and a rack 52 that can mesh with each other. The rack 52 is located below the gear 51. The gear 51 is coaxially fixedly connected to the rotation center of the cover 2 and the nozzle 11, that is, the gear 51 is coaxially fixedly connected to the rotating shaft 72, and the rack 52 is fixedly connected to the guide rod 3.

[0053] Before starting to spray, the cover shell 2 is engaged with the nozzle 11. When spraying, the control switch 12 is retracted, which will drive the stopper 61, the guide rod 3 and the rack 52 to move backward. Through the engagement of the gear 51 and the rack 52, the gear 51 and the rotating shaft 72 will be driven to rotate counterclockwise, that is, the cover shell 2 can be rotated counterclockwise downward to open the paint hole 111 on the nozzle 11. When the control switch 12 is extended to stop spraying, the switch 12 will push the stopper 61 and the guide rod 3 to move forward. Through the engagement of the gear 51 and the rack 52, the gear 51 and the rotating shaft 72 will be driven to rotate clockwise, that is, the cover shell 2 can be rotated clockwise upward until it is engaged with the nozzle 11 and the paint hole 111 is blocked.

[0054] like Figures 4 to 20 As shown, the suction assembly includes a telescopic container 41 and a suction shell 42. The telescopic container 41 is arranged in the spray gun body 1 and can be telescopic in the front and rear directions. The rear end of the telescopic container 41 is fixedly connected to the spray gun body 1, and the front end is fixedly connected to the guide rod 3. Specifically, the telescopic container 41 includes a front plate 411, a rear plate 412 and an annular telescopic member 413 fixedly connected between the front plate 411 and the rear plate 412, and the telescopic container 41 is provided with a receiving groove 414 extending forward from the rear plate 412 to the front plate 411. The receiving groove 414 is isolated from the internal space of the telescopic container 41. The guide rod 3 includes a rod 1 31 and a rod 2 32. The rear end of the rod 1 31 is fixedly connected to the stopper 61, and the front end is inserted into the receiving groove 414 and fixedly connected to the front plate 411. The rear end of the rod 2 32 is fixedly connected to the front plate 411, and the front end is fixedly connected to the rack 52. Therefore, when the guide rod 3 moves back and forth, the telescopic container 41 can be telescoped and the size of the internal space of the telescopic container 41 can be changed.

[0055] The suction shell 42 is arranged on one side of the paint spray hole 111 on the nozzle 11, and a suction hole 421 is provided on the side of the suction shell 42 facing the nozzle 11. The suction shell 42 is connected to the telescopic container 41, and a one-way valve 1 (not shown in the figure) is provided at the connection point to allow gas to enter the telescopic container 41. The telescopic container 41 is also provided with a one-way valve 2 (not shown in the figure) to allow the gas in the telescopic container 41 to be discharged.

[0056] Specifically, the suction shell 42 is slidably connected to the nozzle 11, and the sliding direction of the suction shell 42 is in the same direction as the axial direction of the rotating shaft 72. The suction shell 42 is provided with a slide groove 422 extending up and down, and a slide rod 43 is slidably connected in the slide groove 422. The nozzle 11 is provided with a slide groove 2 112, one end of the slide groove 2 112 is connected to the slide groove 1 422, and the other end is inclined upward. The upper end of the slide rod 43 slides in the slide groove 2 112, and the upper end of the slide rod 43 is provided with a slot 431 for the cover shell 2 to be plugged in. The suction shell 42 is connected to the telescopic container 41 through the air pipe 44, and the part of the air pipe 44 close to the suction shell 42 can be a hose so that the suction shell 42 can slide.

[0057] A push piece 71 is installed in the nozzle 11 for sliding back and forth. The push piece 71 is located on the rear side of the rack 52 and is fixedly connected to the guide rod 3. That is, the push piece 71 is farther away from the cover shell 2 than the rack 52. The side of the push piece 71 facing the cover shell 2 is an inclined surface. The inclined surface gradually approaches the cover shell 2 from top to bottom, and when the cover shell 2 is buckled on the paint spray hole 111 of the nozzle 11, the bottom end of the inclined surface is located below the bottom end of the cover shell 2.

[0058] A sponge adsorption member 81 is provided in the suction shell 42 for adsorbing the paint sucked in from the suction hole 421 , and a sponge adsorption member 82 is provided in the cover shell 2 for adsorbing the paint sprayed from the paint spraying hole 111 .

[0059] When spraying paint, the cover shell 2 is perpendicular to the front end face of the spray head 11, that is, the opening of the cover shell 2 is facing upward, the paint spray hole 111 on the spray head 11 is in the open state, the telescopic container 41 is in the compressed state, the upper end of the slide rod 43 slides and fits in the inclined lower end of the slide groove 112, and the suction shell 42 is in a position away from the paint spray hole 111. When the control switch 12 is extended to stop spraying paint, the switch 12 will push the stopper 61, the guide rod 3, the push member 71 and the rack 52 to move forward. Through the engagement of the gear 51 and the rack 52, the gear 51 and the rotating shaft 72 will be driven to rotate clockwise, so that the cover shell 2 can be rotated upward clockwise quickly until it is buckled on the spray head 11 and blocks the paint spray hole 111. The upper edge of the cover shell 2 will be inserted into the slot 431 at the upper end of the slide rod 43. As the switch 12 continues to extend, the rack 52 will disengage from the gear 51, and the guide rod 3 will drive As the pushing member 71 continues to move forward, the inclined surface of the pushing member 71 will cause the cover shell 2 to slide upward, and the elastic member 74 will be stretched. Since the upper edge of the cover shell 2 is inserted into the upper end of the slide rod 43, the slide rod 43 slides and fits in the slide groove 1 422 and the slide groove 2 112 at the same time, the upward moving cover shell 2 will drive the slide rod 43 to move obliquely upward, and the slide rod 43 will drive the suction shell 42 to move in the direction of the paint spraying hole 111. In addition, in the process of the guide rod 3 moving forward, it will drive the front plate 411 in the telescopic container 41 to move forward, so that the telescopic container 41 gradually extends, and air can be sucked into the telescopic container 41 through the one-way valve 1, the air pipe 44 and the suction hole 421 of the suction shell 42, that is, the paint liquid remaining near the paint spraying hole 111 can be sucked into the suction shell 42, and the sponge adsorption member 1 81 located in the suction shell 42 can adsorb the paint liquid entering the suction shell 42.

[0060] In the above process, the residual paint liquid near the paint spray hole 111 can be sucked into the suction shell 42 through the suction shell 42. However, after one painting is completed, a small amount of adhered paint liquid may still exist in the oil outlet pipe inside the paint spray hole 111. If it is not cleaned up, it will solidify after a period of time. During the next painting, the high-pressure gas ejected from the spray gun body 1 will cause the solidified paint to be sprayed onto the surface of the rod 92, affecting the quality of the rod 92. Based on this:

[0061] When the paint spraying device in this embodiment is spraying paint, the control switch 12 is contracted, and the high-pressure gas will first be ejected from the paint spray hole 111. The airflow will blow the solidified solid impurities forward. In the process of gradual contraction of the switch 12, the stopper 61, the guide rod 3, the push member 71 and the rack 52 will move backward. First, as the push member 71 moves backward, the cover 2 and the gear 51 will gradually slide downward under the pull of the elastic member 74. Under the cooperation of the slide bar 43, the slide groove 1 422 and the slide groove 2 112, the suction shell 42 will move away from the center. The guide rod 3 and the rack 52 move in the direction of the paint spray hole 111, and in the process of the cover 2 moving downward, the paint blown forward by the airflow will be blown onto the sponge adsorption member 2 82 in the cover 2. When the cover 2 moves to the bottom, the rack 52 will engage with the gear 51. As the guide rod 3 and the rack 52 continue to move backward, the gear 51 and the rotating shaft 72 will be driven to rotate counterclockwise through the engagement of the rack 52 and the gear 51, so that the cover 2 can be rotated downward counterclockwise quickly to open the paint spray hole 111 on the spray head 11. At this time, the rod 92 can be painted.

[0062] In addition, during the backward movement of the guide rod 3, the guide rod 3 will drive the front plate 411 in the telescopic container 41 to move backward, the telescopic container 41 will be gradually compressed, and the gas in the telescopic container 41 will be discharged outward through the one-way valve 2.

[0063] In the description of this specification, reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention.

[0064] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A bolt ball grid rod surface spraying device, comprising a spray gun body (1), a spray head (11) provided at the front end of the spray gun body (1), and a switch (12) for controlling paint spraying provided on the spray gun body (1), characterized in that: The spray gun body (1) further comprises a cover (2), a guide rod (3) and a suction assembly, wherein the cover (2) is rotatably mounted on the front end of the spray head (11), the cover (2) is rotatably connected to the spray head (11) via a rotating shaft (72), and can be snapped onto the spray hole (111) of the spray head (11), the guide rod (3) is slidably mounted inside the spray gun body (1), the rear end of the guide rod (3) is connected to the switch (12), and the front end is connected to the cover (2) via a transmission assembly (5), when the control switch (12) is turned on, the cover (2) can be rotated downward to open the spray hole (111) of the spray head (11), and when the control switch (12) is turned off, the cover (2) can be rotated downward to open the spray hole (111) of the spray head (11), and when the control switch (12) is turned off, the cover (2) can be rotated downward to open the spray hole (111) of the spray head (11). The spray gun (11) can be rotated upward to block the paint spray hole (111) of the spray head (11). The suction component includes a telescopic container (41) and a suction shell (42). The telescopic container (41) is arranged in the spray gun body (1) and can be telescopic in the front-back direction. The rear end of the telescopic container (41) is fixedly connected to the spray gun body (1), and the front end is fixedly connected to the guide rod (3). The suction shell (42) is arranged on the spray head (11), and a suction hole (421) is provided on the side of the suction shell (42) facing the spray head (11). The suction shell (42) is connected to the telescopic container (41), and a one-way valve 1 is provided at the connection point. The telescopic container (41) is also provided with a one-way valve 2. The telescopic container (41) comprises a front plate (411), a rear plate (412), and an annular telescopic member (413) fixedly connected between the front plate (411) and the rear plate (412). The telescopic container (41) is provided with a receiving groove (414) extending forward from the rear plate (412) to the front plate (411). The receiving groove (414) is isolated from the internal space of the telescopic container (41). The guide rod (3) includes a rod 1 (31) and a rod 2 (32); The front end of the rod (31) is inserted into the receiving groove (414) and fixedly connected to the front plate (411), and the rear end of the rod (32) is fixedly connected to the front plate (411); The transmission assembly (5) includes a gear (51) and a rack (52) that can mesh with each other, the rack (52) is located below the gear (51), the gear (51) is coaxially fixedly connected to the rotating shaft (72), and the rack (52) is fixedly connected to the guide rod (3); A push piece (71) is installed in the nozzle (11) so as to slide forward and backward. The push piece (71) is located at the rear side of the rack (52) and is fixedly connected to the guide rod (3). The side of the push piece (71) facing the cover (2) is an inclined surface, and when the cover (2) is buckled on the paint spray hole (111) of the nozzle (11), the bottom end of the inclined surface is located below the bottom end of the cover (2); The suction shell (42) is slidably connected to the nozzle (11), and the direction in which the suction shell (42) can slide is the same as the direction of the central axis of rotation of the cover shell (2). The suction shell (42) is provided with a sliding groove (422) extending up and down, and a sliding rod (43) is slidably connected in the sliding groove (422). The nozzle (11) is provided with a sliding groove (112), one end of the sliding groove (112) is connected to the sliding groove (422), and the other end is inclined upward. The upper end of the sliding rod (43) is slidably fitted in the sliding groove (112), and the upper end of the sliding rod (43) is provided with a slot (431) for the cover shell (2) to be plugged in. The suction shell (42) is communicated with the telescopic container (41) through the air pipe (44).

2. The surface spraying device for bolt ball grid rod according to claim 1 is characterized in that: The rear end of the guide rod (3) is fixedly connected to a stopper (61), the switch (12) is an electric push rod, and the bottom end of the stopper (61) is connected to the telescopic end of the switch (12).

3. The surface spraying device for bolt ball grid rod according to claim 1 is characterized in that: A shaft sleeve (73) is rotatably mounted at both ends of the rotating shaft (72). The shaft sleeve (73) is slidably connected to the nozzle (11) up and down. An elastic member (74) is provided between the shaft sleeve (73) and the nozzle (11). When the cover (2) moves upward, the elastic member (74) can apply a downward pulling force to the cover (2).

4. The surface spraying device for bolt ball grid rod according to claim 1 is characterized in that: A sponge adsorption member (81) is provided in the suction shell (42) for adsorbing the paint sucked in from the suction hole (421).

5. The surface spraying device for bolt ball grid rod according to claim 1 is characterized in that: A second sponge adsorption member (82) is provided in the cover shell (2) for adsorbing paint sprayed from the paint spraying hole (111).

6. The surface spraying device for bolt ball grid rod according to claim 1, characterized in that: It also includes a lifting frame (91), on which the spray gun body (1) is mounted for sliding up and down, and a driving mechanism for driving the spray gun body (1) to move up and down is provided on the lifting frame (91).

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