Fire hydrant shell spraying equipment and method

Abstract

The invention belongs to the technical field of spraying equipment, and relates to fire hydrant shell spraying equipment and method.The fire hydrant shell spraying equipment comprises a base, an annular conveying set is arranged on a bottom frame and provided with a plurality of movable ends, supporting seats penetrating through annular grooves are rotationally arranged at the movable ends, and a lifting driving set is arranged between the bottom frame and a protective frame; a supporting block is arranged at the sliding end of the lifting driving set, a rotating shaft is rotationally arranged on the supporting block, a spray head is installed on the rotating shaft through a mounting base connected with the rotating shaft, a torsion spring is connected between the mounting base and the supporting block, a swing arm is connected to the end of the rotating shaft, a first vertical plate is connected between the bottom frame and the protective frame, and abutting plates suitable for extruding the swing arm are obliquely arranged on the upper portion and the lower portion of the first vertical plate. The downward moving spray head can swing upwards to spray the curved surface and the corner angle of the lower portion of the fire hydrant shell, and the upward moving spray head can swing downwards to spray the curved surface and the corner angle of the upper portion of the fire hydrant shell, so that spraying can be conducted more evenly and fully, and the situation that a coating is thin at the dead angle of the fire hydrant shell is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of spraying equipment, and specifically relates to a spraying equipment and method for a fire hydrant housing. Background Art

[0002] As a core component of the outdoor fire protection system, the fire hydrant is exposed to harsh environments for a long time. The performance of its housing coating is directly related to the service life and safety of the equipment. Traditional manual spraying highly depends on the experience of operators, which easily leads to problems such as uneven coating thickness, missed spraying, or sagging. Especially for the complex curved surfaces and angular structures (such as flange interfaces and bolt holes) of the fire hydrant housing, manual operation is rather cumbersome, and the long-term working fatigue affects the spraying efficiency.

[0003] Even though automatic spraying is adopted in the existing technology, there are still certain limitations. For example, in the patent with the patent publication number CN221311082U, it discloses an automatic spraying system for a fire hydrant. This spraying system sprays the fire hydrant placed on the self-rotating assembly through a spray gun at a fixed position. The large-area diffusion spraying easily affects the working environment, and the spray gun cannot adaptively change the spraying angle to spray the curved surfaces and angular structures of the fire hydrant. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned disadvantages of the existing technology, and provide a spraying equipment and method for a fire hydrant housing that can automatically change the spraying angle to spray the curved surfaces and angular structures of the fire hydrant, with good spraying effects.

[0005] To solve the above technical problems, the present invention provides such a spraying equipment for a fire hydrant housing, which includes a base, a protective frame and a chassis connected to the base. A collection box located within the protective frame is connected to the chassis. There is an annular groove spaced between the upper part of the chassis and the upper part of the base. One side of the annular groove is surrounded by the protective frame. An annular conveying group is provided on the chassis. The annular conveying group has a plurality of movable ends adapted to move along the annular groove. A support seat penetrating through the annular groove is rotatably arranged on the movable end. The support seat is used to support the fire hydrant housing and is driven to rotate by a rotation driving group installed in the base. A lifting driving group is provided between the chassis and the protective frame. A support block is provided at the sliding end of the lifting driving group. A rotating shaft is rotatably arranged on the support block. A spray head with a left-facing spray port is installed on the rotating shaft through a connected mounting seat. A torsion spring located within the support block and surrounding the rotating shaft is connected between the mounting seat and the support block. The torsion spring is used to apply torsion to make the mounting seat drive the spray head to be in a horizontal state. The rear end of the rotating shaft is connected to an L-shaped swing arm. A first vertical plate is connected between the chassis and the protective frame. The upper and lower parts of the first vertical plate are both inclined with a contact plate adapted to squeeze the swing arm. The left part of the lower first vertical plate is inclined upward, and the left part of the upper first vertical plate is inclined downward.

[0006] Preferably, the rotation drive group includes a first gear connected to the lower part of the support base. A drive motor is installed inside the left part of the base, and an output shaft of the drive motor is connected to a second gear adapted to engage with the first gear.

[0007] Preferably, the lifting drive group includes a guide rod connected between the base and the protective frame. A guide frame supporting the support block slides on the guide rod. A rotating rod rotates between the base and the protective frame. The rotating rod has a bidirectional lead screw portion, and a nut connected to the guide frame is threadedly connected to the bidirectional lead screw portion. The sliding end of the lifting drive group is constituted by the nut and the guide frame. The drive motor is a double-shaft motor. One output shaft of the drive motor is connected to the second gear, and there is a synchronous drive group between the other output shaft of the drive motor and the rotating rod. The synchronous drive group consists of two synchronous pulleys and a synchronous belt.

[0008] Preferably, it further includes a chuck. The contact plate is rotatably arranged on the first vertical plate through a support rod connected thereto. A chuck is connected to the support rod. A circle of card slots is formed on the chuck. Card blocks adapted to be stuck in the card slots on the chuck slide on the upper rear side and the lower rear side of the first vertical plate respectively.

[0009] Preferably, it further includes a second vertical plate connected between the base and the protective frame. The second vertical plate is located behind the first vertical plate. A guide groove similar to the overall shape of the fire hydrant housing is formed on the second vertical plate. The support block slides on the guide frame. A contact rod sliding in the guide groove is connected to one side of the support block; the upper contact rod is close to the upper end of the guide groove, and the lower contact rod is close to the lower end of the guide groove.

[0010] Preferably, the annular conveying group includes an annular guide rail connected to the chassis. The movable end slides on the annular guide rail. A first synchronous pulley and a second synchronous pulley rotate on the chassis. The rotating rod movably penetrates through the second synchronous pulley. A synchronous belt connected to the movable end is driven between the second synchronous pulley and the first synchronous pulley. A servo motor is installed inside the base, and an output shaft of the servo motor is connected to the first synchronous pulley.

[0011] Preferably, it further includes a wedge-shaped clamping block. The support base is in a T shape. A circle of wedge-shaped clamping blocks with uniform intervals slide on the upper part of the support base. A T-shaped slide rod slides on the support base. The upper end of the T-shaped slide rod is adapted to squeeze the wedge-shaped clamping blocks. A connecting ring is connected to the middle part of the T-shaped slide rod. A compression spring surrounding the T-shaped slide rod and located inside the support base is connected between the connecting ring and the support base. A contact ring adapted to squeeze the T-shaped slide rod is connected to the position of the base far from the protective frame.

[0012] A spraying method for the fire hydrant housing spraying device according to the above, including: S1) Place the fire hydrant housing on the support base, and control the annular conveying group to drive the support base to drive the fire hydrant housing to move into the protective frame; S2) The rotation drive group drives the fire hydrant housing on the support base to rotate, and the lifting drive group drives the spray head to reciprocate up and down to spray the rotating fire hydrant housing; S3) The descending spray head will swing upward to spray the curved surface and corners at the lower part of the fire hydrant housing, and the ascending spray head will swing downward to spray the curved surface and corners at the upper part of the fire hydrant housing.

[0013] On the basis of overcoming the disadvantages of the prior art, the beneficial effects that the present invention can achieve are: The spray head reciprocates up and down to cooperate with the rotation of the fire hydrant housing to spray the fire hydrant housing evenly and fully, avoiding the influence of large-area diffusion spraying on the working environment. The descending spray head will swing upward to spray the curved surface and corners at the lower part of the fire hydrant housing, and the ascending spray head will swing downward to spray the curved surface and corners at the upper part of the fire hydrant housing, so as to spray more evenly and fully, avoiding the situation of thinner coating at the dead corners of the fire hydrant housing. Description of the Drawings

[0014] Figure 1 It is an assembly schematic diagram of the present invention.

[0015] Figure 2 It is a cross-sectional view of the present invention.

[0016] Figure 3 It is a front view of the present invention based on Figure 2

[0017] Figure 4 It is a schematic diagram of the first gear, the drive motor and the second gear of the present invention.

[0018] Figure 5 It is a schematic diagram of the rear side direction of the present invention based on Figure 4

[0019] Figure 6 It is a schematic diagram of the positional relationship between the swing arm and the contact plate of the present invention.

[0020] Figure 7 It is an enlarged view of part A of the present invention Figure 4

[0021] Figure 8 It is a schematic diagram of the annular conveying group of the present invention.

[0022] Figure 9 It is a cross-sectional view of the support base of the present invention.

[0023] The reference signs in the drawings provided by the present invention are: 11 - base, 10 - annular groove, 12 - protective frame, 13 - chassis, 14 - collection box, 2 - annular conveyor group, 20 - movable end, 21 - annular guide rail, 22 - synchronous pulley I, 23 - synchronous pulley II, 24 - synchronous belt, 25 - servo motor, 3 - support base, 31 - wedge-shaped clamping block, 32 - T-shaped slide bar, 33 - compression spring, 41 - gear I, 42 - drive motor, 43 - gear II, 5 - lifting drive group, 51 - guide rod, 52 - rotating rod, 520 - bidirectional lead screw portion, 531 - guide frame, 532 - nut, 54 - synchronous drive group, 61 - support block, 62 - rotating shaft, 63 - mounting seat, 64 - torsion spring, 65 - nozzle, 71 - swing arm, 72 - vertical plate I, 73 - abutting plate, 81 - support rod, 82 - chuck, 83 - clamping block, 91 - vertical plate II, 90 - guide groove, 92 - abutting rod, 93 - abutting ring. Detailed implementation manners

[0024] The terms "first", "second", and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] A fire hydrant housing spraying device, as Figures 1-6As shown in the figure, it includes a base 11, a protective frame 12 and a chassis 13 connected to the base 11. A collection box 14 located inside the protective frame 12 is connected to the chassis 13. There is an annular groove 10 spaced between the upper part of the chassis 13 and the upper part of the base 11. One side of the annular groove 10 is surrounded by the protective frame 12. An annular conveyor group 2 is provided on the chassis 13. The annular conveyor group 2 has a plurality of movable ends 20 adapted to move along the annular groove 10. A support seat 3 penetrating through the annular groove 10 is rotatably mounted on the movable end 20. The support seat 3 is used to support the fire hydrant housing. Place the fire hydrant housing to be sprayed on the support seat 3 from the right side of the base 11. Control the annular conveyor group 2 to drive the movable end 20 to drive the support seat 3 to move clockwise along the annular groove 10. The support seat 3 will drive the fire hydrant housing placed thereon to move to the left side of the base 11 and pass through the inside of the protective frame 12 for spraying, and then move out to the right from the inside of the protective frame 12. The support seat 3 is driven to rotate by a rotary drive group installed in the base 11, and the fire hydrant housing is driven to rotate by itself through the support seat 3 inside the protective frame 12 so that the spraying operation can be carried out. A lifting drive group 5 is provided between the chassis 13 and the protective frame 12. A support block 61 is provided at the sliding end of the lifting drive group 5. A rotating shaft 62 is rotatably mounted on the support block 61. A nozzle 65 with a left-facing spray port is installed on the rotating shaft 62 through a connected mounting seat 63. A torsion spring 64 located inside the support block 61 and surrounding the rotating shaft 62 is connected between the mounting seat 63 and the support block 61. The torsion spring 64 is used to apply torsion to make the mounting seat 63 drive the nozzle 65 to be in a horizontal state. The annular conveyor group 2 will drive the movable end 20 to drive the fire hydrant housing on the support seat 3 inside the protective frame 12 to move to the left of the nozzle 65, so that the nozzle 65 is externally connected to a hose to convey paint for spraying the fire hydrant housing. The excess paint during the spraying process will fall into the collection box 14 for collection. During the spraying process, control the lifting drive group 5 to drive the support block 61 to drive the rotating shaft 62, the mounting seat 63 and the nozzle 65 to move up and down reciprocally to cooperate with the rotation of the fire hydrant housing to spray the fire hydrant housing evenly and fully, and also avoid the influence of large-area diffusion spraying on the working environment. The rear end of the rotating shaft 62 is connected to an L-shaped swing arm 71. A first vertical plate 72 is connected between the chassis 13 and the protective frame 12. Contact plates 73 adapted to squeeze the swing arm 71 are inclinedly provided at the upper and lower parts of the first vertical plate 72. The left part of the lower contact plate 73 is inclined upward. In this way, when the lifting drive group 5 drives the nozzle 65 to move down to spray the lower part of the fire hydrant housing, the rotating shaft 62 will also drive the swing arm 71 to move down and be squeezed by the lower contact plate 73. At this time, the swing arm 71 will drive the nozzle 65 on the mounting seat 63 to swing upward by a predetermined angle through the rotating shaft 62, so as to automatically and synchronously spray the dead corner positions of the curved surface and angular structure at the lower part of the fire hydrant housing upward during the spraying process of the lower part of the fire hydrant housing. The left part of the upper contact plate 73 is inclined downward. Similarly, when the lifting drive group 5 drives the nozzle 65 to move up to spray the upper part of the fire hydrant housing, the swing arm 71 moves up and will be squeezed by the upper contact plate 73 to drive the nozzle 65 on the mounting seat 63 to swing downward by a predetermined angle through the rotating shaft 62.In the process of spraying the upper part of the fire hydrant shell, the curved surface and the corners of the angular structure of the upper part of the fire hydrant shell are automatically and synchronously sprayed upwards; it should be explained that after the contact plate 73 releases the swing arm 71, the mounting seat 63 will drive the spray head 65 to rotate and reset to a horizontal state under the action of the torsion spring 64 to spray the rest of the fire hydrant shell normally, so that the spraying can be more uniform and sufficient, avoiding the situation where the coating is thin in the dead corners of the fire hydrant shell.

[0026] like Figure 3 and Figure 4 As shown, the rotary drive group includes a gear 41 connected to the lower part of the support seat 3, a drive motor 42 is installed on the inner side of the left part of the base 11, and the output shaft of the drive motor 42 is connected to a gear 43 suitable for engaging with the gear 41. The support seat 3 moving along the left side of the annular groove 10 in the protective frame 12 will drive the gear 41 to gradually engage with the gear 43. At this time, the annular conveying group 2 is stopped, and the drive motor 42 is controlled to drive the gear 43 to rotate the drive gear 41. The gear 41 will drive the fire hydrant shell to rotate through the support seat 3 to facilitate the spraying operation.

[0027] like Figures 3-6 As shown, the lifting drive group 5 includes a guide rod 51 connected between the base 11 and the guard frame 12, a guide frame 531 supporting the support block 61 slides on the guide rod 51, a rotating rod 52 rotates between the base 11 and the guard frame 12, the rotating rod 52 has a bidirectional screw rod portion 520, and a nut 532 connected to the guide frame 531 is threadedly connected on the bidirectional screw rod portion 520. The nut 532 and the guide frame 531 constitute the sliding end of the lifting drive group 5. The rotation of the rotating rod 52 will drive the nut 532 to reciprocate up and down through the bidirectional screw rod portion 520. The upward movement of the nut 532 will drive the support block 61 to move upward through the guide frame 531, thereby driving the nozzle 65 to move upward. When the nut 532 moves downward, it will drive the support block 61 to move downward through the guide frame 531, thereby driving the nozzle 65 to move downward. The driving motor 42 is a dual-axis motor. One of the output shafts of the driving motor 42 is connected to the gear 2 43, and the other output shaft of the driving motor 42 is transmitted with a synchronous transmission group 54 to the rotating rod 52. Therefore, when the driving motor 42 drives the support seat 3 to drive the fire hydrant shell to rotate, the driving motor 42 will also drive the rotating rod 52 to rotate through the synchronous transmission group 54, and then when the fire hydrant shell rotates, the nozzle 65 will automatically and synchronously move up and down for spraying. The synchronous transmission group 54 is composed of two synchronous wheels and a synchronous belt.

[0028] like Figure 4 , Figure 6 and Figure 7The support rod 81 is rotated to adjust the inclination angle of the contact plate 73 on the vertical plate 72, and the swing angle of the swing arm 71 after being squeezed by the contact plate 73 is also adjusted immediately, so that the spraying angle of the sprinkler head 65 when rotating can be adaptively changed according to the shape of the fire hydrant shell. The support rod 81 is connected to the chuck 82, and a circle of slots are opened on the chuck 82. The upper rear side and the lower rear side of the vertical plate 72 are both slidably provided with a block 83 suitable for clamping the slot on the chuck 82. Initially, the block 83 clamps the slot on the chuck 82, and the chuck 82 cannot rotate. When the angle of the contact plate 73 needs to be adjusted, the block 83 is first driven to move up to release the slot on the chuck 82, and then the support rod 81 can be rotated to adjust the angle of the contact plate 73. After adjustment, the block 83 is moved down to clamp the corresponding slot, which has strong adaptability.

[0029] like Figure 2 , Figure 4 and Figure 5 As shown, it also includes a second vertical plate 91 connected between the base 11 and the guard frame 12, the second vertical plate 91 is located behind the first vertical plate 72, and a guide groove 90 similar to the overall shape of the fire hydrant shell is opened on the second vertical plate 91, the support block 61 is slidably arranged on the guide frame 531, and a resistance rod 92 that slides in the guide groove 90 is connected to one side of the support block 61, so that when the lifting drive group 5 drives the nozzle 65 to move up and down, the guide frame 531 will drive the resistance rod 92 on the support block 61 to move up and down along the guide groove 90, and the resistance rod 92 will slide in the guide groove 90. 0 drives the support block 61 to slide along the guide frame 531 under the extrusion of the support block 61, and the support block 61 also drives the nozzle 65 on the mounting seat 63 through the rotating shaft 62 to maintain a reasonable spraying distance from the fire hydrant shell according to the overall shape of the fire hydrant shell to ensure the spraying effect; for example, when the upper part of the fire hydrant shell is in a dome shape, the upper part of the guide groove 90 is bent at a predetermined angle, and the nozzle 65 will gradually approach the fire hydrant shell during the upward movement; the upper resistance rod 92 is close to the upper end of the guide groove 90, and the lower resistance rod 92 is close to the lower end of the guide groove 90.

[0030] like Figure 8 As shown, the annular conveying group 2 includes an annular guide rail 21 connected to the base frame 13, and the movable end 20 slides on the annular guide rail 21. A synchronous pulley 1 22 and a synchronous pulley 23 are rotated on the base frame 13. The rotating rod 52 is movable through the synchronous pulley 23. A synchronous belt 24 connected to the movable end 20 is transmitted between the synchronous pulley 23 and the synchronous pulley 1 22. A servo motor 25 is installed in the base 11. The output shaft of the servo motor 25 is connected to the synchronous pulley 1 22. The servo motor 25 is controlled to drive the synchronous pulley 1 22 to rotate. The synchronous pulley 1 22 will drive the synchronous belt 24 to rotate under the cooperation of the synchronous pulley 23, and the synchronous belt 24 will drive the movable end 20 to move along the annular groove 10.

[0031] likeFigure 2 and Figure 9 As shown, it further includes a wedge-shaped clamping block 31. The shape of the support base 3 is T-shaped. A circle of wedge-shaped clamping blocks 31 with uniform intervals are slidably arranged on the upper part of the support base 3. The inner side of the fire hydrant housing placed on the support base 3 is clamped by the mutual separation of the wedge-shaped clamping blocks 31. A T-shaped sliding rod 32 is slidably arranged on the support base 3. The upper end of the T-shaped sliding rod 32 is adapted to squeeze the wedge-shaped clamping blocks 31. A connecting ring is connected to the middle of the T-shaped sliding rod 32. A compression spring 33 that surrounds the T-shaped sliding rod 32 and is located inside the support base 3 is connected between the connecting ring and the support base 3. The T-shaped sliding rod 32 will move downward under the reset action of the compression spring 33. When the T-shaped sliding rod 32 moves downward, its upper end will squeeze the wedge-shaped clamping blocks 31 on the support base 3 to move away from each other. A contact ring 93 adapted to squeeze the T-shaped sliding rod 32 is connected to the position of the base 11 away from the protection frame 12. When the annular conveying group 2 drives the support base 3 to move to the right side of the annular groove 10, the T-shaped sliding rod 32 on the support base 3 will be squeezed by the contact ring 93 to move upward to release the wedge-shaped clamping blocks 31. The T-shaped sliding rod 32 will drive the connecting ring to move upward to squeeze the compression spring 33 to deform. At this time, the fire hydrant housing on the support base 3 can be normally taken and placed. When the annular conveying group 2 drives the support base 3 to gradually move to the left side of the annular groove 10, the T-shaped sliding rod 32 will gradually disengage from the contact ring 93, and the compression spring 33 will reset, so as to automatically clamp the fire hydrant housing with the wedge-shaped clamping blocks 31 after the fire hydrant housing is placed, improving the stability during spraying.

[0032] A spraying method for the fire hydrant housing spraying device according to the above, includes: S1) Place the fire hydrant housing on the support base 3, and control the annular conveying group 2 to drive the support base 3 to drive the fire hydrant housing to move into the protection frame 12; S2) The rotation drive group drives the fire hydrant housing on the support base 3 to rotate, and the lifting drive group 5 drives the nozzle 65 to move up and down reciprocally to spray the rotating fire hydrant housing; S3) The descending nozzle 65 will swing upward to spray the curved surface and corners at the lower part of the fire hydrant housing, and the ascending nozzle 65 will swing downward to spray the curved surface and corners at the upper part of the fire hydrant housing.

[0033] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. It only expresses the preferred implementation modes of the present invention, and the description is relatively specific and detailed, but it cannot be construed as a limitation to the scope of the present invention patent.

[0034] It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations, quantity increases or decreases, improvements and substitutions can still be made. Therefore, based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the protection scope of the present invention.

Claims

1. A fire hydrant housing spraying device, characterized in that It includes a base (11), a protective frame (12) connected to the base (11), and a chassis (13). A collection box (14) is connected to the chassis (13). There is an annular groove (10) between the chassis (13) and the base (11). An annular conveying group (2) is provided on the chassis (13). The annular conveying group (2) has a plurality of movable ends (20) adapted to move along the annular groove (10). A support base (3) passing through the annular groove (10) is rotatably provided on the movable end (20). The support base (3) is driven to rotate by a rotary drive group installed in the base (11). An elevating drive group (5) is provided between the chassis (13) and the protective frame (12). A support block (61) is provided at the sliding end of the elevating drive group (5). A rotating shaft (62) is rotatably provided on the support block (61). A spray head (65) is installed on the rotating shaft (62) through a connected mounting seat (63). A torsion spring (64) is connected between the mounting seat (63) and the support block (61). An end of the rotating shaft (62) is connected to a swing arm (71). A first vertical plate (72) is connected between the chassis (13) and the protective frame (12). Contact plates (73) adapted to squeeze the swing arm (71) are inclinedly provided at the upper and lower parts of the first vertical plate (72).

2. The spraying device for a fire hydrant housing according to claim 1, wherein The rotary drive group includes a first gear (41) connected to the support base (3). A drive motor (42) is installed in the base (11). An output shaft of the drive motor (42) is connected to a second gear (43) adapted to mesh with the first gear (41).

3. The spraying device for a fire hydrant housing according to claim 2, wherein, The elevating drive group (5) includes a guide rod (51) connected between the base (11) and the protective frame (12). A guide frame (531) supporting the support block (61) slides on the guide rod (51). A rotating rod (52) is rotatably provided between the base (11) and the protective frame (12). The rotating rod (52) has a bidirectional lead screw portion (520). A nut (532) connected to the guide frame (531) is threadedly connected to the bidirectional lead screw portion (520). The sliding end of the elevating drive group (5) is constituted by the nut (532) and the guide frame (531). The drive motor (42) is a double-shaft motor. One output shaft of the drive motor (42) is connected to the second gear (43). A synchronous drive group (54) is provided between the other output shaft of the drive motor (42) and the rotating rod (52).

4. A fire hydrant housing spraying device according to claim 3, characterized in that, It also includes a chuck (82). The contact plate (73) is rotatably provided on the first vertical plate (72) through a connecting support rod (81). The support rod (81) is connected with the chuck (82). A circle of card slots is provided on the chuck (82). Card blocks (83) adapted to be stuck in the card slots on the chuck (82) slide on the upper and lower parts of the first vertical plate (72).

5. The spraying device for a fire hydrant housing according to claim 3, characterized in that, It further includes a second vertical plate (91) connected between the base (11) and the protective frame (12). The second vertical plate (91) is located behind the first vertical plate (72). A guide groove (90) similar to the overall shape of the fire hydrant housing is formed on the second vertical plate (91). The support block (61) is slidably arranged on the guide frame (531). One side of the support block (61) is connected with a contact rod (92) that slides in the guide groove (90). The upper contact rod (92) is close to the upper end of the guide groove (90), and the lower contact rod (92) is close to the lower end of the guide groove (90).

6. A fire hydrant housing spraying device according to claim 1, characterized in that, The annular conveying group (2) includes an annular guide rail (21) connected to the chassis (13). The movable end (20) slides on the annular guide rail (21). A first synchronous pulley (22) and a second synchronous pulley (23) are rotatably arranged on the chassis (13). A synchronous belt (24) connected to the movable end (20) is driven between the second synchronous pulley (23) and the first synchronous pulley (22). A servo motor (25) is installed in the base (11), and the output shaft of the servo motor (25) is connected to the first synchronous pulley (22).

7. A fire hydrant housing spraying device according to claim 1, characterized in that, It further includes a wedge-shaped clamping block (31). The support base (3) is in a T shape. A circle of wedge-shaped clamping blocks (31) with uniform intervals is slidably arranged on the upper part of the support base (3). A T-shaped sliding rod (32) is slidably arranged on the support base (3). The upper end of the T-shaped sliding rod (32) is adapted to squeeze the wedge-shaped clamping block (31). The T-shaped sliding rod (32) is connected with a connecting ring, and a compression spring (33) is connected between the connecting ring and the support base (3). A contact ring (93) adapted to squeeze the T-shaped sliding rod (32) is connected at a position of the base (11) away from the protective frame (12).

8. A spraying method of a spraying device for a fire hydrant housing according to claim 1, characterized in that, It includes: S1) Place the fire hydrant housing on the support base (3), and control the annular conveying group (2) to drive the support base (3) to drive the fire hydrant housing to move into the protective frame (12); S2) The rotation drive group drives the fire hydrant housing on the support base (3) to rotate, and the lifting drive group (5) drives the nozzle (65) to move up and down reciprocally to spray the rotating fire hydrant housing; S3) The descending nozzle (65) will swing upward to spray the curved surface and corners at the lower part of the fire hydrant housing, and the ascending nozzle (65) will swing downward to spray the curved surface and corners at the upper part of the fire hydrant housing.

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