A range adjustable architectural finish surface spraying device

Abstract

The utility model discloses a building decoration surface spraying device of adjustable range belongs to building decoration equipment technical field. The device includes spraying machine main part, and the front end of spraying machine main part is connected with the shunt pole subassembly in proper order to connect the flexible pipe, and the upper end of shunt pole subassembly is assembled automatic stretch frame through the movable hinge, and spraying machine main part is equipped with push -and -pull frame, steering wheel, trundle and power plug with spiral wire, and the convenient removal and power supply. The shunt pole subassembly contains the shunt pipe, the valve, the multiple groups of shunt flexible pipe and the shower nozzle, realizes the stable shunt of coating and the spraying start -stop control, and the automatic stretch frame is composed of C shape frame, bidirectional screw rod, motor, L shape movable frame, inlaying pole, outer slide, slide, rubber ring and gyro wheel, can automatically adjust the length to change the spraying range, and the sliding slide can adjust the shower nozzle angle and density, and the replacement gyro wheel can control the spraying thickness. The device through the cooperation of each part, improves the spraying efficiency greatly, guarantees the spraying steady accurate, and adapts the diversification building decoration spraying scene.

Description

Technical Field

[0001] This utility model relates to the field of building decoration equipment technology, and in particular to a building decoration surface spraying device with adjustable range. Background Technology

[0002] In the field of building decoration, paint spraying on surfaces such as walls and ceilings is a crucial construction step that directly affects the decoration effect and project progress. With the large-scale development of the decoration industry, the market has placed higher demands on the efficiency, precision, and adaptability of spraying operations.

[0003] In existing technologies, spraying operations mainly rely on two methods: one is manual operation with a single spray gun held by hand. Operators need to repeatedly move the spray gun to cover a large area of ​​wall, which is not only labor-intensive, but also prone to overlapping or missed spraying due to the manually controlled spraying path, resulting in uneven coating thickness and difficulty in ensuring construction quality; the other is the use of a multi-nozzle spraying rack with fixed specifications. Although it can improve efficiency to some extent, the length of the spraying rack, the spacing between nozzles and the spraying angle are mostly fixed designs, which cannot be flexibly adjusted according to the wall size (such as narrow walls in small apartments or wide walls in large spaces). When facing irregular walls or areas that need to be sprayed locally, the adaptability is extremely poor, requiring frequent equipment changes or touch-ups, which seriously affects the construction progress.

[0004] Meanwhile, existing spraying equipment has significant shortcomings in terms of stability and precise control. Some devices lack reliable wall adhesion and guiding structures, and the nozzle is prone to misalignment due to component shaking during spraying, further exacerbating the problem of uneven coating. Moreover, most devices cannot easily adjust the distance between the nozzle and the wall. If it is necessary to change the spray thickness, a large number of components need to be disassembled and replaced, which is cumbersome and difficult to meet diverse construction needs.

[0005] To address this, a range-adjustable spraying device for architectural decoration surfaces is proposed. Utility Model Content

[0006] The purpose of this invention is to solve the above problems by proposing a new type of spraying device that can flexibly adjust the spraying range, ensure spraying accuracy, and is easy to operate.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an adjustable building decoration surface spraying device, comprising a spraying machine body; a connecting hose is fixedly connected to the front end of the spraying machine body, and a diverter rod assembly is fixedly connected to the end of the connecting hose away from the spraying machine body; a movable hinge is fixedly mounted on the upper end of the diverter rod assembly, and an automatic extension frame is fixedly mounted on the upper end of the movable hinge; a push-pull frame is fixedly mounted on the rear side of the spraying machine body, steering wheels are fixedly mounted on the two front corners of the bottom surface, casters are movably mounted on the rear end of the bottom surface, and a power plug is provided near one corner of the rear surface.

[0008] Preferably, the spraying machine body has an inspection door on the side, a fixed assembly control panel is embedded in the top sloping surface, and a feed cover can be detachably installed at one end of the top surface; the connecting wire between the power plug and the spraying machine body is a spiral wire.

[0009] Preferably, the diverter assembly includes a diverter pipe, a valve, a diverter hose, a hexagonal nut, and a nozzle; the diverter pipe is bonded and fixed to the end of the connecting hose away from the main body of the sprayer; the valve is located at the lower end of the diverter pipe and controls the opening and closing of the diverter pipe; the diverter hose is sleeved on the diverter interface of the diverter pipe; the hexagonal nut is sleeved on the threaded portion of the diverter interface of the diverter pipe and locks the diverter hose in place; the nozzle is fixedly connected to the end of the diverter hose away from the diverter pipe.

[0010] Preferably, the diversion hose, hexagonal nut, and nozzle are provided with multiple sets of diversion interfaces corresponding to the outside of the diversion pipe; the upper end of the diversion pipe is welded to the lower end of the movable hinge.

[0011] Preferably, the automatic extension frame includes a C-shaped frame, a bidirectional screw, a motor, two L-shaped movable frames, an inner rod, and an outer sliding sleeve. The C-shaped frame is welded to the upper end of a movable hinge, and the bidirectional screw is rotatably installed in the through holes at both ends of the C-shaped frame. The motor is fixedly assembled in the circular frame at one end of the C-shaped frame, and its output end is fixedly connected to one end of the bidirectional screw. The two L-shaped movable frames are respectively fitted onto both ends of the bidirectional screw. The inner rod is welded to one end of one of the L-shaped movable frames, and the outer sliding sleeve is welded to one end of the other L-shaped movable frame and inserted into the limiting groove on the outside of the inner rod. The threads at both ends of the bidirectional screw have different directions. The motor can drive the bidirectional screw to rotate, causing the L-shaped movable frames to move back and forth along both ends of the bidirectional screw towards the center, thereby causing the outer sliding sleeve to be pulled out or inserted from the limiting groove of the inner rod. The inner rod and the outer sliding sleeve can prevent the L-shaped movable frames from rotating on the bidirectional screw.

[0012] Preferably, the automatic extension frame further includes multiple sliding sleeves and rubber rings; the multiple sliding sleeves are evenly distributed and sleeved on the outer side of the inner rod and the outer sliding sleeve, and the rubber rings are bonded and fixed to the inner wall of the sliding sleeves and fit against the inner rod and the outer side of the outer sliding sleeves; a ring is integrally formed at the upper end of the sliding sleeve, and the nozzle is bonded and fixed inside the ring.

[0013] Preferably, the automatic extension frame also includes a limiting screw head and a roller; the limiting screw head is detachably installed in the threaded hole on the side of the L-shaped movable frame, and the roller is rotatably fitted into the limiting groove of the limiting screw head.

[0014] The beneficial effects of this utility model are as follows: Through the arrangement of the diverter assembly, the movable hinge, and the automatic extension frame, these three components work together efficiently, giving the sprayer significant performance advantages: The automatic extension frame can flexibly adjust the spraying area, easily achieving large-area wall spraying and greatly improving work efficiency; During operation, the rollers on the automatic extension frame roll closely against the wall, and with the stable connection of the movable hinge, effectively preventing component shaking and making the spraying process more stable; The spraying angle can be easily adjusted by sliding the sleeve, precisely adapting to the spraying needs of different areas of the wall; If it is necessary to control the spraying thickness, simply disassemble and replace the rollers to adjust the distance between the nozzle and the wall, accurately controlling the spraying thickness and fully meeting the requirements of diverse spraying scenarios. Attached Figure Description

[0015] Appendix Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Appendix Figure 2 This is the utility model Figure 1 Enlarged diagram of part A in the middle;

[0017] Appendix Figure 3 This is the utility model Figure 1 Enlarged diagram of section B;

[0018] Appendix Figure 4 This is the utility model Figure 1 Enlarged diagram of section C;

[0019] Appendix Figure 5 This is an exploded view of the automatic extension frame of this utility model;

[0020] Appendix Figure 6 This is the utility model Figure 5 Enlarged diagram of section D in the middle;

[0021] Appendix Figure 7 This is the utility model Figure 5 Enlarged diagram of section E in the middle;

[0022] Appendix Figure 8 This is the utility model Figure 5 Enlarged schematic diagram of section F in the middle.

[0023] Legend: 1. Main body of the sprayer; 2. Connecting hose; 3. Diverter rod assembly; 301. Diverter pipe; 302. Valve; 303. Diverter hose; 304. Hex nut; 305. Spray head; 4. Movable hinge; 5. Automatic extension frame; 501. C-shaped frame; 502. Bidirectional screw; 503. Motor; 504. L-shaped movable frame; 505. Embedded rod; 506. Outer sliding sleeve; 507. Sliding sleeve; 508. Rubber ring; 509. Limit screw head; 510. Roller; 6. Push-pull bracket; 7. Steering wheel; 8. Caster; 9. Power plug. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only a part of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0025] See Figure 1-8 As shown, the main body 1 of the spraying machine serves as the core power and control hub of the entire spraying device, providing power support for paint delivery and device operation. The inspection door on its side facilitates later maintenance and repair of internal components; a fixed control panel is embedded in the sloping top surface for controlling key operations such as the motor 503 switch; a removable feed cover at one end of the top surface facilitates paint addition; simultaneously, it serves as the mounting base for connecting the hose 2, push-pull bracket 6, steering wheels 7, casters 8, and power plug 9, integrating all components to form a complete spraying system.

[0026] The connecting hose 2 serves a dual purpose: conveying paint and connecting components. One end is fixedly connected to the main body 1 of the sprayer, and the other end is fixedly connected to the diverter assembly 3, which can stably convey the paint in the main body 1 of the sprayer to the diverter assembly 3. At the same time, a movable hinge 4 is fixedly mounted on its upper end to provide installation support for the automatic extension frame 5, so as to realize a stable connection between the automatic extension frame 5 and the connecting hose 2.

[0027] The movable hinge 4 is fixedly mounted on the upper end of the diverter rod assembly 3, with its lower end welded to the diverter pipe 301 and its upper end welded to the C-shaped frame 501 of the automatic extension frame 5. It features flexible rotation, allowing the automatic extension frame 5 to rotate around the upper end of the diverter rod assembly 3 at a certain angle. This facilitates operators in adjusting the spraying direction to meet the needs of spraying walls at different angles. The tightness of the bolts on the movable hinge 4 can also be adjusted to prevent the spraying angle from changing due to excessive flexibility of the hinge 4.

[0028] The push-pull bracket 6 is fixedly mounted on the rear side of the spraying machine body 1, providing a leverage point for the operator. The operator can hold the push-pull bracket 6 to push or pull the spraying machine body 1, and in conjunction with the rolling of the steering wheels 7 and casters 8, move the entire spraying device, making it easy to move the device to different spraying positions.

[0029] The steering wheels 7 are fixedly mounted on the two front corners of the bottom of the spraying machine body 1, providing flexible steering functionality. When moving the spraying device, the steering wheels 7 can adjust the direction of movement of the device, allowing operators to change the device's path according to the needs of the spraying operation and improving the flexibility of the device's movement.

[0030] Casters 8 are movably mounted on the rear end of the bottom surface of the spraying machine body 1, mainly serving to support and assist rolling. Together with the steering wheels 7, they support the weight of the spraying machine body 1. When the device is pushed or pulled, casters 8 roll together with the steering wheels 7, enabling the entire device to move smoothly and reducing resistance during movement.

[0031] The power plug 9 is located on the rear surface of the spraying machine body 1 near one corner and is used to connect to an external power source. After the power plug 9 is inserted into the external power socket, it can supply power to the power components (such as the components that drive the paint conveying) and motor 503 inside the spraying machine body 1, ensuring that the entire spraying device can operate normally. Moreover, the connecting wire between the power plug 9 and the spraying machine body 1 is a spiral wire, which can be stretched or retracted as needed to facilitate the movement of the device and avoid the wires from becoming tangled.

[0032] See appendix Figure 1-4 As shown, the diverter assembly 3 is responsible for diverting the paint delivered by the connecting hose 2 and achieving precise spraying through the nozzle 305. Specifically, it includes the following sub-components:

[0033] The diverter pipe 301 is the core skeleton of the diverter rod assembly 3. One end is glued and fixed to the end of the connecting hose 2 away from the main body 1 of the sprayer, and receives the paint from the connecting hose 2. Multiple diverter interfaces are provided on the outside for connecting the diverter hose 303 to realize the diversion of paint. The upper end is welded to the lower end of the movable hinge 4 to connect the diverter rod assembly 3 to the automatic extension frame 5, ensuring the integrity of the components during the spraying process.

[0034] Valve 302 is located at the lower end of the diversion pipe 301, and its main function is to control the opening and closing of the diversion pipe 301. In use, the operator holds the handle on valve 302. Opening valve 302 allows paint to flow in the diversion pipe 301, while closing it stops the paint delivery, making it easy to control the start and stop of spraying.

[0035] The diversion hose 303 is fitted onto the diversion interface of the diversion pipe 301, serving as a channel for conveying paint from the diversion pipe 301 to the nozzle 305. It can flexibly adapt to the position adjustment of the nozzle 305, ensuring that the paint is stably delivered to the nozzle 305.

[0036] The hexagonal nut 304 is fitted onto the threaded part of the diversion port of the diversion pipe 301. By tightening, the diversion hose 303 can be locked and fixed on the diversion port of the diversion pipe 301 to prevent the paint from leaking from the port during the transportation process and to ensure the sealing and stability of the connection between the diversion hose 303 and the diversion pipe 301.

[0037] The nozzle 305 is fixedly connected to the end of the distribution hose 303 furthest from the distribution pipe 301, and is the component from which the paint is finally sprayed. After the paint is delivered to the nozzle 305 through the distribution hose 303, it is sprayed from the nozzle 305 onto the wall surface, realizing the spraying operation of the building decoration surface. At the same time, the nozzle 305 can adjust its tilt angle with the sliding sleeve 507 to change the spraying angle and adapt to different spraying needs. Moreover, the distribution hose 303, the hexagonal nut 304, and the nozzle 305 are provided with multiple sets of distribution interfaces on the outside of the distribution pipe 301, which can improve spraying efficiency and coverage.

[0038] See appendix Figure 1-8 As shown, the automatic extension frame 5 is mainly used to adjust the position, spacing, and spraying range of the spray nozzles 305, ensuring the flexibility and accuracy of the spraying operation. Specifically, it includes the following sub-components:

[0039] The C-shaped frame 501 is welded to the upper end of the movable hinge 4 and serves as the basic frame of the automatic extension frame 5. It provides mounting support for the bidirectional screw 502 and the motor 503. The bidirectional screw 502 is rotatably installed in the through holes at both ends, and the motor 503 is fixedly assembled in the circular frame at one end, ensuring the stable installation and operation of all components of the automatic extension frame 5.

[0040] The bidirectional screw 502 is rotatably mounted in the through holes at both ends of the C-shaped frame 501, with different thread directions at both ends. Driven by the motor 503, it can rotate and drive the two L-shaped movable frames 504 sleeved at both ends of the bidirectional screw 502 to move back and forth towards the center along both ends of the bidirectional screw 502 through thread transmission. It is the core transmission component for realizing the length adjustment of the automatic extension frame 5.

[0041] The motor 503 is fixedly mounted inside the circular frame at one end of the C-shaped frame 501, and its output end is fixedly connected to one end of the bidirectional screw 502, providing power for the rotation of the bidirectional screw 502. The motor 503 can be switched on and off via the control panel on the main body 1 of the spraying machine. After the motor 503 is started, it drives the bidirectional screw 502 to rotate, thereby driving the automatic extension frame 5 to extend or retract.

[0042] Two L-shaped movable frames 504 are provided, respectively fitted onto both ends of the bidirectional screw 502. Driven by the rotation of the bidirectional screw 502, they can move back and forth along both ends of the bidirectional screw 502 towards the center; at the same time, they are welded to the inner rod 505 and the outer sliding sleeve 506 respectively, which can drive the inner rod 505 and the outer sliding sleeve 506 to move synchronously. They are key components connecting the bidirectional screw 502 with the inner rod 505 and the outer sliding sleeve 506, and also provide an installation position for the limit screw head 509.

[0043] An embedded rod 505 is welded to one end of one of the L-shaped movable frames 504, and a limiting groove is provided on the outer side, into which an outer sliding sleeve 506 can be inserted. In cooperation with the outer sliding sleeve 506, it can move with the L-shaped movable frame 504 to adjust the overall length of the automatic extension frame 5; on the other hand, it can prevent the L-shaped movable frame 504 from rotating on the bidirectional screw 502, ensuring the stability of the L-shaped movable frame 504's movement direction, and also serves as one of the mounting carriers for the sliding sleeve 507.

[0044] The outer sliding sleeve 506 is welded to one end of another L-shaped movable frame 504 and inserted into the limiting groove on the outside of the inner rod 505. When the L-shaped movable frame 504 moves, it can be pulled out or inserted into the limiting groove of the inner rod 505, and together with the inner rod 505, it realizes the adjustment of the overall length of the automatic extension frame 5; at the same time, it helps the inner rod 505 to prevent the L-shaped movable frame 504 from rotating, and is also one of the mounting carriers of the sliding sleeve 507.

[0045] Multiple sliding sleeves 507 are evenly distributed and fitted around the inner rod 505 and the outer sliding sleeve 506. A ring is integrally formed at the upper end, and the nozzle 305 is glued and fixed inside the ring. It can move on the inner rod 505 and the outer sliding sleeve 506 to adjust its own spacing, thereby changing the spray density of the nozzle 305. Simultaneously, the tilt angle can be adjusted to change the spray angle of the nozzle 305 to adapt to different spraying needs. It is a key component for realizing the adjustment of the position and angle of the nozzle 305.

[0046] The rubber ring 508 is bonded and fixed to the inner wall of the sliding sleeve 507, and fits against the outer side of the inner rod 505 and the outer sliding sleeve 506. Utilizing the elasticity and friction of the rubber, the friction between the sliding sleeve 507 and the inner rod 505 and the outer sliding sleeve 506 is increased, preventing the sliding sleeve 507 from moving arbitrarily without manual adjustment, ensuring the stability of the sliding sleeve 507 after position adjustment, and thus ensuring the stability of the position and angle of the nozzle 305.

[0047] The limit screw head 509 can be detachably installed in the threaded hole on the side of the L-shaped movable frame 504. The outer side is provided with a limit groove for installing the roller 510, providing rotational support and limit for the roller 510. At the same time, different specifications of roller 510 can be replaced by disassembly and reinstallation.

[0048] The roller 510 is rotatably fitted into the limiting groove of the limiting screw head 509. During use, the roller 510 contacts the wall surface. As the operator holds the distributor tube 301 and pushes and pulls the device, the roller 510 rolls against the wall, reducing friction between the device and the wall, making the device move more smoothly and facilitating the operator to control the spraying path. At the same time, by changing to different specifications of roller 510, the distance between the spray head 305 and the wall can be adjusted to adapt to different spraying thickness requirements.

[0049] The operation procedure of this utility model is as follows: When preparing for power connection, locate the power plug 9 near one corner of the rear surface of the spraying machine body 1. According to the requirements of the work position, stretch or retract the spiral wire connected to it, and insert the power plug 9 into the external power socket to supply power to the entire spraying device, ensuring that the power components and motor 503 can start normally.

[0050] When adding paint, open the detachable feed cover at one end of the top surface of the sprayer body 1, add an appropriate amount of paint, and then tighten the feed cover again to prevent paint leakage or impurities from entering.

[0051] When preparing for the start and stop control of spraying, hold the valve 302 handle at the lower end of the diversion pipe 301 in the diversion rod assembly 3. At this time, keep the valve 302 closed to prepare for subsequent control of paint delivery.

[0052] When positioning and attaching the device, hold the diverter tube 301 and attach the roller 510 on the automatic extension frame 5 to the surface of the wall to be sprayed, ensuring that the roller 510 is in close contact with the wall, laying the foundation for smooth movement and stable spraying in the future.

[0053] When adjusting the length of the automatic extension frame, operate the control panel on the top slope of the spraying machine body 1 and turn on the motor 503 switch. After the motor 503 starts, it drives the bidirectional screw 502 to rotate, which drives the L-shaped movable frames 504 sleeved at both ends of the bidirectional screw 502 to move from the middle of the bidirectional screw 502 to both ends. This, in turn, pulls the outer sliding sleeve 506 out of the limiting sliding groove of the inner rod 505. After adjusting to the appropriate overall length of the automatic extension frame 5 according to the spraying coverage requirements, turn off the motor 503.

[0054] When adjusting the nozzle parameters, move the sliding sleeve 507 along the outer side of the inner rod 505 and the outer sliding sleeve 506 to adjust the interval between multiple sliding sleeves 507 to achieve the required spraying density of the nozzle 305; at the same time, rotate the sliding sleeve 507 to adjust its tilt angle, thereby changing the spraying angle of the nozzle 305 to adapt to the spraying needs of different areas of the wall. The rubber ring 508 will fix the position of the sliding sleeve 507 through friction.

[0055] When adjusting the distance between the nozzle and the wall, if it is necessary to change the distance between the nozzle 305 and the wall to adjust the spray thickness, first remove the limit screw head 509 from the threaded hole on the side of the L-shaped movable frame 504, replace it with the roller 510 of the corresponding specification, and then reinstall the limit screw head 509 with the new roller 510 back into the threaded hole of the L-shaped movable frame 504 to ensure that the installation is firm.

[0056] When starting the paint delivery and spraying, hold the handle of valve 302 and open valve 302. At this time, the airflow carries the paint in the main body 1 of the sprayer into the diversion pipe 301 through the connecting hose 2. The paint is then diverted to each diversion hose 303 through the diversion interface on the outside of the diversion pipe 301, and finally sprayed out from the nozzle 305 connected to the diversion hose 303 and sprayed onto the wall surface.

[0057] During mobile spraying operations, keep your hand on the distributor pipe 301 while the roller 510 rolls against the wall. Slowly push or pull the device to move the nozzle 305 along the preset spraying path, ensuring that the wall is evenly covered with paint and completing the entire spraying operation.

[0058] Although embodiments of the present invention have been shown and described, those skilled in the art should understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A range-adjustable architectural decoration surface spraying device, characterized in that: The system includes a spraying machine body (1); a connecting hose (2) is fixedly connected to the front end of the spraying machine body (1), and a diverter rod assembly (3) is fixedly connected to the end of the connecting hose (2) away from the spraying machine body (1); a movable hinge (4) is fixedly mounted on the upper end of the diverter rod assembly (3), and an automatic extension frame (5) is fixedly mounted on the upper end of the movable hinge (4); a push-pull frame (6) is fixedly mounted on the rear side of the spraying machine body (1), steering wheels (7) are fixedly mounted on the two front corners of the bottom surface, casters (8) are movably mounted on the rear end of the bottom surface, and a power plug (9) is provided near one corner of the rear surface.

2. The adjustable-range building decoration surface spraying device according to claim 1, characterized in that: The main body (1) of the spraying machine has an inspection door on its side, a fixed assembly control panel is embedded in the top sloping surface, and a feed cover can be detachably installed on one end of the top surface; the connecting wire between the power plug (9) and the main body (1) of the spraying machine is a spiral wire.

3. The adjustable-range building decoration surface spraying device according to claim 2, characterized in that: The diverter assembly (3) includes a diverter pipe (301), a valve (302), a diverter hose (303), a hexagonal nut (304), and a nozzle (305). The diverter pipe (301) is bonded and fixed to the end of the connecting hose (2) away from the main body (1) of the sprayer. The valve (302) is located at the lower end of the diverter pipe (301) and controls the opening and closing of the diverter pipe (301). The diverter hose (303) is sleeved on the diverter interface of the diverter pipe (301). The hexagonal nut (304) is sleeved on the threaded part of the diverter interface of the diverter pipe (301) and locks the diverter hose (303) in place. The nozzle (305) is fixedly connected to the end of the diverter hose (303) away from the diverter pipe (301).

4. The adjustable-range building decoration surface spraying device according to claim 3, characterized in that: The diversion hose (303), hexagonal nut (304) and nozzle (305) are provided with multiple sets of diversion interfaces corresponding to the outside of the diversion pipe (301); the upper end of the diversion pipe (301) is welded to the lower end of the movable hinge (4).

5. The adjustable-range building decoration surface spraying device according to claim 4, characterized in that: The automatic extension frame (5) includes a C-shaped frame (501), a bidirectional screw (502), a motor (503), two L-shaped movable frames (504), an inner rod (505), and an outer sliding sleeve (506); the C-shaped frame (501) is welded to the upper end of the movable hinge (4), and the bidirectional screw (502) is rotatably installed in the through holes at both ends of the C-shaped frame (501); the motor (503) is fixedly assembled in the circular frame at one end of the C-shaped frame (501), and its output end is fixedly connected to one end of the bidirectional screw (502); the two L-shaped movable frames (504) are respectively sleeved on both ends of the bidirectional screw (502), and the inner rod (505) is welded to the upper end of the movable hinge (4). One end of one L-shaped movable frame (504) is welded to the other end of the outer sliding sleeve (506) and inserted into the limiting groove outside the inner rod (505); the two ends of the bidirectional screw (502) have different thread directions, and the motor (503) can drive the bidirectional screw (502) to rotate, causing the L-shaped movable frame (504) to move back and forth along the two ends of the bidirectional screw (502) towards the middle, thereby causing the outer sliding sleeve (506) to be pulled out or inserted from the limiting groove of the inner rod (505), and the inner rod (505) and the outer sliding sleeve (506) can prevent the L-shaped movable frame (504) from rotating on the bidirectional screw (502).

6. The adjustable-range building decoration surface spraying device according to claim 5, characterized in that: The automatic extension frame (5) also includes multiple sliding sleeves (507) and rubber rings (508); the multiple sliding sleeves (507) are evenly distributed and sleeved on the outside of the inner rod (505) and the outer sliding sleeve (506), and the rubber rings (508) are bonded and fixed to the inner wall of the sliding sleeves (507) and fit against the outside of the inner rod (505) and the outer sliding sleeve (506); a ring is integrally formed on the upper end of the sliding sleeve (507), and the nozzle (305) is bonded and fixed inside the ring.

7. The adjustable-range building decoration surface spraying device according to claim 6, characterized in that: The automatic extension frame (5) also includes a limiting screw head (509) and a roller (510); the limiting screw head (509) is detachably installed in the threaded hole on the side of the L-shaped movable frame (504), and the roller (510) is rotatably sleeved in the limiting groove of the limiting screw head (509).

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