Fan-shaped water spray gun and test method for waterproof test of fabricated wall joint

Abstract

The application discloses a sector-shaped water gun for an assembled wall joint waterproof test, which comprises a water gun pipe, a spray head arranged at the tail end of the water gun pipe, a spherical shell cover, a spherical nozzle arranged in the spherical shell cover and coaxial with the water gun pipe, and an exposure opening arranged at the front end of the spherical shell cover and hollowed out. In the initial state, the spherical nozzle has a horizontal sector ring-shaped nozzle in the exposure range of the exposure opening, and the horizontal sector ring-shaped water spray has higher temporary efficiency than the traditional fine columnar point-shaped spray.

Description

Technical Field

[0001] This invention belongs to the field of waterproofing testing for prefabricated walls. Background Technology

[0002] During the construction of prefabricated wall panels, such as Figure 1 As shown, after the waterproofing construction is completed, a waterproofing test should be conducted on the horizontal and vertical joints of the prefabricated wall at the construction site. The specific test process is roughly as follows: water pressure greater than 200 kPa is used to vertically spray water onto the joint, and then the back of the wall is observed to see if there is any water seepage. If there is no water seepage, it means that the waterproofing project at the joint is qualified. The existing spray guns used for waterproofing tests can generally only shoot out a thin columnar water jet. This thin columnar jet can only spray a local point of the joint. To complete the spraying of the entire joint, the spray gun needs to be moved slowly and precisely along a straight line until any part of the joint is completely sprayed by this thin columnar jet. Therefore, it has the problems of low efficiency and unstable operation. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a fan-shaped water spray gun and test method for waterproofing test of prefabricated wall joints, which is more efficient than the traditional thin columnar point spray.

[0004] Technical solution: To achieve the above objectives, the present invention provides a fan-shaped water spray gun for waterproofing test of prefabricated wall joints, comprising a spray gun tube, a spray head at the end of the spray gun tube, the spray head comprising a spherical shell cover, a spherical nozzle rotatably disposed inside the spherical shell cover, and an exposed opening coaxial with the spray gun tube at the front end of the spherical shell cover; in the initial state, the spherical nozzle has a horizontal fan-shaped annular nozzle within the exposed range of the exposed opening, and horizontal fan-shaped water sprays are emitted from the fan-shaped annular nozzle.

[0005] Furthermore, a transverse torsion spring channel runs through the spherical nozzle. The axis of the transverse torsion spring channel is perpendicular to the axis of the spray gun pipe. There is an annular inner edge in the middle of the transverse torsion spring channel. A fixed shaft passes through the transverse torsion spring channel coaxially. The two ends of the fixed shaft are fixed to the inner wall of the spherical shell cover. The inner ring of the annular inner edge is rotatably engaged with the fixed shaft.

[0006] A torsion spring is coaxially fitted on both sides of the inner edge of the ring outside the fixed shaft. The two ends of each torsion spring are respectively fixedly connected to the inner wall of the spherical shell and the inner edge of the ring. Both torsion springs apply a counterclockwise torque to the spherical nozzle, so that the spherical nozzle tends to rotate counterclockwise around the fixed shaft.

[0007] The spherical nozzle is provided with a narrow arc groove with a central angle greater than 180°. The width of the arc groove is consistent with the longitudinal thickness of the fan-shaped annular nozzle. The arc axis of the arc groove is coaxial with the fixed axis.

[0008] Furthermore, in the initial state, neither the counterclockwise nor the clockwise end of the arc-shaped narrow groove reaches the exposure range of the exposure port.

[0009] Furthermore, based on the initial state, after the spherical nozzle rotates clockwise by a° around the fixed axis, a section of the arc-shaped narrow groove near the clockwise end reaches the exposure range of the exposure port, while the fan-shaped annular nozzle leaves the exposure range of the exposure port.

[0010] Furthermore, an isolation disc is coaxially fixed inside the spray gun tube, and a linkage rod through hole is provided on the axis of the isolation disc. A linkage rod passes through the linkage rod through the hole coaxially, and the inner wall of the linkage rod through the hole is slidably sealed to the outer wall of the linkage rod by a third O-ring. A traction linkage rope is connected to the front end of the linkage rod along its length. Inside the spray gun tube, the front and rear sides of the isolation disc are coaxially aligned front liquid guiding channels and rear liquid guiding channels, respectively.

[0011] The front section of the traction linkage rope is arc-shaped and attached to the arc-shaped bottom arc contour of the counterclockwise section of the arc narrow groove. The traction linkage rope attached to the arc contour of the bottom of the groove is called the curved segment linkage rope. The counterclockwise end of the curved segment linkage rope is fixedly connected to the counterclockwise end of the arc contour of the bottom of the groove.

[0012] Furthermore, a limiting outer edge is fixedly connected to the linkage rod. In the initial state, the limiting outer edge is in the rear liquid guiding channel and is in contact with the rear side of the isolation plate. Under the limitation of the limiting outer edge, the spherical nozzle cannot rotate counterclockwise around the fixed axis. A hydraulic drive plate located in the middle section of the rear liquid guiding channel is fixedly connected to the rear end of the linkage rod. An annular liquid passage gap is formed between the outer periphery of the hydraulic drive plate and the inner wall of the spray gun tube. One end of the liquid guiding bend is connected to the tail end of the rear liquid guiding channel, and the other end of the liquid guiding bend is vertically connected to the front liquid guiding channel.

[0013] It also includes a three-way solenoid valve, wherein the three-way valve is connected to the high-pressure water supply pipe, the first spray gun inlet pipe and the second spray gun inlet pipe respectively; the three-way solenoid valve has a state a and a state b; in state a, the high-pressure water supply pipe and the first spray gun inlet pipe are connected to each other; in state b, the high-pressure water supply pipe and the second spray gun inlet pipe are connected to each other; the outlet end of the first spray gun inlet pipe is connected to the front guide liquid channel, and the outlet end of the second spray gun inlet pipe is connected to the rear guide liquid channel between the hydraulic drive plate and the isolation plate.

[0014] Furthermore, the counterclockwise and clockwise ends of the fan-shaped annular nozzle are both connected to the inside of the fan-shaped annular nozzle through two liquid guiding channels.

[0015] Furthermore, the inner walls of the front and rear ends of the spherical shell cover are respectively slidably sealed to the outer spherical surface of the spherical nozzle through a first O-ring and a second O-ring; both the first O-ring and the second O-ring are coaxial with the spray gun tube.

[0016] Furthermore, the method for using the fan-shaped water spray gun for the waterproofing test of prefabricated wall joints is as follows: With the three-way solenoid valve in state a, the operator holds the spray gun and sprays a horizontal fan-shaped water spray from the annular nozzle towards the horizontal joint of the prefabricated wall. Then, observe whether there is water seepage at the corresponding horizontal joint on the back of the prefabricated wall. If there is no seepage, the splicing process of the horizontal joint is qualified. Switching the three-way solenoid valve from state a to state b, a section of the arc-shaped narrow groove near the clockwise end reaches the exposure range of the exposed opening. The operator holds the spray gun and sprays a vertical fan-shaped water spray from the section of the arc-shaped narrow groove near the clockwise end towards the vertical joint of the prefabricated wall. Then, observe whether there is water seepage at the corresponding vertical joint on the back of the prefabricated wall. If there is no seepage, the splicing process of the vertical joint is qualified.

[0017] Beneficial effects: The present invention sprays horizontal fan-shaped water droplets from the annular nozzle. The intersection of these fan-shaped water droplets with the prefabricated wall surface is exactly a horizontal straight line. When the worker holds the spray gun and makes the intersection line of the horizontally sprayed fan-shaped water droplets from the annular nozzle with the prefabricated wall surface coincide with the horizontal joint, the water spraying process of the entire horizontal joint can be completed in one go. This is more efficient than the traditional thin columnar point spraying.

[0018] At the same time, once the horizontal joints of the spray-painted prefabricated wall are completed, the structure of this scheme can be immediately transformed into the longitudinal joints of the spray-painted prefabricated wall. Attached Figure Description

[0019] Appendix Figure 1 This is a schematic diagram of a prefabricated wall structure.

[0020] Appendix Figure 2 This is a schematic diagram of the overall structure of the water spray test gun of this device;

[0021] Appendix Figure 3 For the appendix Figure 2 Sectional view along direction A;

[0022] Appendix Figure 4 This is a schematic diagram showing two spray states of the spray head;

[0023] Appendix Figure 5 For the appendix Figure 4 A schematic diagram of the exploded structure;

[0024] Appendix Figure 6 This is a schematic diagram of a spherical nozzle structure. Detailed Implementation

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] As attached Figures 1 to 6 The fan-shaped water spray gun shown in the prefabricated wall joint waterproofing test is as follows: Figure 2 The spray gun includes a spray gun pipe 3, with a spray head 1 at its end. The spray head 1 includes a spherical shell cover 19, within which a spherical nozzle 18 is rotatably mounted. The front end of the spherical shell cover 19 has an exposed opening 20 coaxial with the spray gun pipe 3. In the initial state, such as Figure 4 As shown in the diagram above, the spherical nozzle 18 has a horizontal fan-shaped nozzle 21 within the exposed area of ​​the exposed port 20. Horizontal fan-shaped water spray is emitted from the fan-shaped nozzle 21. The intersection of this fan-shaped water spray with the wall surface of the prefabricated wall 50 is exactly a horizontal straight line. When the worker holds the spray gun pipe 3 and makes the fan-shaped water spray horizontally emitted from the fan-shaped nozzle 21 coincide with the intersection line of the wall surface of the prefabricated wall 50 and the horizontal joint 30.1, the water spraying process of the entire horizontal joint 30.1 can be completed in one go. This is more efficient than the traditional thin columnar point spraying.

[0027] The rear end of the spherical shell cover 19 is sealed to the front end of the spray gun tube 3 through the flange structure 14; the inner walls of the front and rear ends of the spherical shell cover 19 are respectively sealed to the outer spherical surface of the spherical nozzle 18 through the first O-ring 23 and the second O-ring 13; the first O-ring 23 and the second O-ring 13 are both coaxial with the spray gun tube 3.

[0028] like Figure 4 A transverse torsion spring channel 32 runs horizontally through the spherical nozzle 18. The axis of the transverse torsion spring channel 32 is perpendicular to the axis of the spray gun tube 3. An annular inner edge 33 is integrally provided in the middle of the transverse torsion spring channel 32. A fixed shaft 15 passes through the transverse torsion spring channel 32 coaxially. The two ends of the fixed shaft 15 are fixed to the inner wall of the spherical shell cover 19. The inner ring of the annular inner edge 33 is rotatably engaged with the fixed shaft 15 through a bearing 33. Torsion springs 35 are coaxially sleeved on both sides of the annular inner edge 33 outside the fixed shaft 15. The two ends of each torsion spring 35 are respectively fixedly connected to the inner wall of the spherical shell cover 19 and the annular inner edge 33. Both torsion springs 35 apply a counterclockwise torque to the spherical nozzle 18, so that the spherical nozzle 18 tends to rotate counterclockwise around the fixed shaft 15.

[0029] like Figure 2 and 6The spherical nozzle 18 is provided with a circular arc narrow groove 12 with a central angle greater than 180°. The width of the circular arc narrow groove 12 is consistent with the longitudinal thickness of the fan-shaped annular nozzle 21. The arc axis of the circular arc narrow groove 12 is coaxial with the fixed shaft 15. In the initial state, neither the counterclockwise nor the clockwise end of the circular arc narrow groove 12 reaches the exposure range of the exposure port 20.

[0030] Based on the initial state, after the spherical nozzle 18 rotates clockwise by a° around the fixed axis 15 (in this scheme, a° is 90°), a section of the arc-shaped narrow groove 12 near the clockwise end reaches the exposure range of the exposure port 20. This section forms a longitudinal fan-shaped nozzle, and the fan-shaped annular nozzle 21 is removed from the exposure range of the exposure port 20.

[0031] The counterclockwise and clockwise ends of the fan-shaped annular nozzle 21 are both connected to the inside of the fan-shaped annular nozzle 21 through two liquid guiding channels 22; an isolation plate 24 is coaxially fixed inside the spray gun tube 3, and a linkage rod through hole 29 is set on the axis of the isolation plate 24. A linkage rod 4 passes through the linkage rod through hole 29 coaxially, and the inner wall of the linkage rod through hole 29 is slidably sealed to the outer wall of the linkage rod 4 through a third O-ring seal 28; a traction linkage rope 2 is connected to the front end of the linkage rod 4 along the length direction. The traction linkage rope 2 is made of stainless steel wire rope or high-strength nylon fiber rope, etc. Inside the spray gun tube 3, the front and rear sides of the isolation plate 24 are coaxially aligned with a front liquid guiding channel 11 and a rear liquid guiding channel 9, respectively; a fixed pulley 16 with an axis parallel to the fixed shaft 15 is set at the front end of the front liquid guiding channel 11. The fixed pulley 16 is rotatably mounted on the fixed pulley shaft 1. 7. The front section of the traction linkage rope 2 passes under the fixed pulley 16 and then attaches to the arc-shaped bottom arc profile 12.1 of the arc-shaped narrow groove 12 in a counterclockwise direction. The traction linkage rope 2 attached to the bottom arc profile 12.1 is referred to as the curved linkage rope 2.1. The counterclockwise end of the curved linkage rope 2.1 is fixedly connected to the counterclockwise end 41 of the bottom arc profile 12.1. The linkage rod 4 is fixedly connected to the limiting outer edge 15. In the initial state, the limiting outer edge 15 is in the rear liquid guiding channel 9 and the limiting contact is on the rear side of the isolation plate 24. Under the limiting of the limiting outer edge 15, the spherical nozzle 18 cannot rotate counterclockwise around the fixed axis 15. The rear end of the linkage rod 4 is coaxially fixedly connected to the hydraulic drive plate 26 located in the middle section of the rear liquid guiding channel 9. An annular liquid passage gap 27 is formed between the outer periphery of the hydraulic drive plate 26 and the inner wall of the spray gun pipe 3.

[0032] The rear liquid guiding channel 9 is connected to one end of the liquid guiding bend 10, and the other end of the liquid guiding bend 10 is vertically connected to the front liquid guiding channel 11; it also includes a three-way solenoid valve 6, the three-way valve 6 is connected to the high-pressure water supply pipe 8, the first spray gun inlet pipe 5 and the second spray gun inlet pipe 7 respectively; the three-way solenoid valve 6 has a state a and a state b; in state a, the high-pressure water supply pipe 8 and the first spray gun inlet pipe 5 are connected to each other; in state b, the high-pressure water supply pipe 8 and the second spray gun inlet pipe 7 are connected to each other; the outlet end of the first spray gun inlet pipe 5 is connected to the front liquid guiding channel 11, and the outlet end of the second spray gun inlet pipe 7 is connected to the rear liquid guiding channel 9 between the hydraulic drive plate 26 and the isolation plate 24.

[0033] Work process: Spraying the horizontal joints of the 50mm prefabricated wall panel, step 30.1:

[0034] In the initial state, the torsion spring 35 applies a counterclockwise torque to the spherical nozzle 18, causing the spherical nozzle 18 to tend to rotate counterclockwise around the fixed axis 15. Due to the limiting outer edge 15 limiting the contact with the rear side of the isolation plate 24, the spherical nozzle 18 cannot rotate further counterclockwise around the fixed axis 15 under the limitation of the limiting outer edge 15. The fan-shaped annular nozzle 21 of the spherical nozzle 18 is just within the exposure range of the exposure port 20 and is in a horizontal state. At this time, the three-way solenoid valve 6 is controlled to enter state a, so that the high-pressure water supply pipe 8 is connected to the first spray gun inlet pipe 5, while the second spray gun inlet pipe 7 is in a closed state. The high-pressure water in the high-pressure water supply pipe 8 is forced into the front guide liquid channel 11 from the first spray gun inlet pipe 5, so that the water in the front guide liquid channel 11 flows forward rapidly under the action of water pressure. Then the water at the front end of the front guide liquid channel 11 is forced into the circular nozzle 21. Water in the arc-shaped narrow groove 12, under the action of water pressure, flows into the exposed fan-shaped annular nozzle 21 through the two liquid guiding channels 22. Then, horizontal fan-shaped water sprays are sprayed forward from the fan-shaped annular nozzle 21. At the same time, since the second spray gun inlet pipe 7 is in a closed state, there is no water flow in the rear liquid guiding channel 9. Therefore, the pressures of the front and rear of the hydraulic drive disc 26 cancel each other out and are in a stable equilibrium state. The operator holds the spray gun pipe 3 and sprays the horizontal fan-shaped water spray from the fan-shaped annular nozzle 21 forward, aiming it at the horizontal joint 30.1 of the prefabricated wall 50. The horizontal fan-shaped water spray from the fan-shaped annular nozzle 21 is evenly injected into the horizontal joint 30.1. Then, it is observed whether there is water seepage at the horizontal joint 30.1 corresponding to the back of the prefabricated wall 50. If there is no water seepage, it means that the waterproofing process of the horizontal joint 30.1 is qualified.

[0035] The process of immediately converting the horizontal joint 30.1 of the spray-painted prefabricated wall 50 into the vertical joint 30.2 of the spray-painted prefabricated wall 50:

[0036] At this time, the three-way solenoid valve 6 switches from state a to state b, connecting the high-pressure water supply pipe 8 and the second spray gun inlet pipe 7, while the first spray gun inlet pipe 5 remains closed. High-pressure water (greater than 200 kPa) in the high-pressure water supply pipe 8 is forced from the second spray gun inlet pipe 7 into the front of the rear guide channel 9. The high-pressure water in the front of the rear guide channel 9 surges rapidly backward, continuously pushing the hydraulic drive disc 26 backward, thus actuating the hydraulic drive... The disk 26 moves backward along the axial direction. Under the linkage of the traction linkage rope 2, the hydraulically driven disk 26 moves backward, causing the curved linkage rope 2.1 to pull the spherical nozzle 18 clockwise. This forces the spherical nozzle 18 to rotate clockwise by 'a' degrees around the fixed axis 15 and enter a stable state. At this time, a section of the arc-shaped narrow groove 12 near the clockwise end reaches the exposure range of the exposure port 20. This section of the arc-shaped narrow groove 12 near the clockwise end forms a longitudinal fan-shaped nozzle, and the fan-shaped annular nozzle 21 follows the spherical nozzle 18. Rotate to the point of exiting the exposure range of the exposure port 20; simultaneously, the high-pressure water at the front of the rear liquid guiding channel 9 rushes rapidly backward into the liquid guiding bend 10, and then the water in the liquid guiding bend 10 is rapidly forced into the front liquid guiding channel 11 under the action of water pressure. The water in the front liquid guiding channel 11 flows forward rapidly under the action of water pressure, and then the water at the front end of the front liquid guiding channel 11 is forced into a local section near the counterclockwise end of the arc-shaped narrow groove 12, and is sprayed forward in a longitudinal fan shape from a local section near the clockwise end of the arc-shaped narrow groove 12. For the water spray test, the operator holds the spray gun 3 and sprays a section of the arc-shaped narrow groove 12 near the clockwise end forward in a longitudinal fan-shaped spray pattern, aiming it at the longitudinal joint 30.2 of the prefabricated wall 50. This ensures that the longitudinal fan-shaped spray pattern from the section of the arc-shaped narrow groove 12 near the clockwise end is evenly injected into the longitudinal joint 30.2. Then, the operator observes whether there is any water seepage at the corresponding longitudinal joint 30.2 on the back of the prefabricated wall 50. If there is no water seepage, it indicates that the waterproofing process of the longitudinal joint 30.2 is qualified.

[0037] When the three-way solenoid valve 6 switches from state b to state a, the spray head 1 automatically returns to its initial state under the restoring force of the torsion spring 35, thereby realizing the arbitrary switching between horizontal fan-shaped water spray and vertical fan-shaped water spray.

[0038] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A fan-shaped water spray gun for waterproofing testing of prefabricated wall joints, characterized in that: Includes a spray gun tube (3), the end of which is provided with a spray head (1), the spray head (1) includes a spherical shell cover (19), a spherical nozzle (18) is rotatably arranged inside the spherical shell cover (19) with the same center, and the front end of the spherical shell cover (19) is hollowed out with an exposure port (20) coaxial with the spray gun tube (3); in the initial state, the spherical nozzle (18) has a horizontal fan-shaped nozzle (21) within the exposure range of the exposure port (20), and horizontal fan-shaped water sprays are ejected from the fan-shaped nozzle (21); A transverse torsion spring channel (32) is transversely connected to the spherical nozzle (18), and the axis of the transverse torsion spring channel (32) is perpendicular to the axis of the spray gun tube (3). The spherical nozzle (18) is provided with a circular arc narrow groove (12) with a central angle greater than 180°. The width of the circular arc narrow groove (12) is consistent with the longitudinal thickness of the fan-shaped annular nozzle (21). The arc axis of the circular arc narrow groove (12) is coaxial with the fixed shaft (15). An isolation plate (24) is coaxially fixed inside the spray gun tube (3). A linkage rod through hole (29) is provided on the axis of the isolation plate (24). A linkage rod (4) passes through the linkage rod through hole (29) coaxially. The inner wall of the linkage rod through hole (29) is slidably sealed to the outer wall of the linkage rod (4) by a third O-ring seal (28). A traction linkage rope (2) is connected to the front end of the linkage rod (4) along the length direction. Inside the spray gun tube (3), the front and rear sides of the isolation plate (24) are coaxially arranged front liquid guiding channel (11) and rear liquid guiding channel (9). The front section of the traction linkage rope (2) is arc-shaped and attached to the bottom arc contour (12.1) of the arc narrow groove (12) in the counterclockwise direction. The traction linkage rope (2) attached to the bottom arc contour (12.1) is called the curved segment linkage rope (2.1). The counterclockwise end of the curved segment linkage rope (2.1) is fixedly connected to the counterclockwise end (41) of the bottom arc contour (12.1). The linkage rod (4) is fixedly connected to a limiting outer edge (25). In the initial state, the limiting outer edge (25) is in the rear liquid guiding channel (9) and is in limiting contact with the rear side of the isolation plate (24). Under the limiting of the limiting outer edge (25), the spherical nozzle (18) cannot rotate counterclockwise around the fixed axis (15). The rear end of the linkage rod (4) is coaxially fixedly connected to a hydraulic drive plate (26) located in the middle section of the rear liquid guiding channel (9). An annular liquid passage gap (27) is formed between the outer periphery of the hydraulic drive plate (26) and the inner wall of the spray gun tube (3). The tail end of the rear liquid guiding channel (9) is connected to one end of a liquid guiding bend (10), and the other end of the liquid guiding bend (10) is vertically connected to the front liquid guiding channel (11). It also includes a three-way solenoid valve (6), the three-way of which is connected to the high-pressure water supply pipe (8), the first spray gun inlet pipe (5) and the second spray gun inlet pipe (7) respectively; the three-way solenoid valve (6) includes state a and state b; in state a, the high-pressure water supply pipe (8) and the first spray gun inlet pipe (5) are connected to each other; in state b, the high-pressure water supply pipe (8) and the second spray gun inlet pipe (7) are connected to each other; the outlet end of the first spray gun inlet pipe (5) is connected to the front guide liquid channel (11), and the outlet end of the second spray gun inlet pipe (7) is connected to the rear guide liquid channel (9) between the hydraulic drive plate (26) and the isolation plate (24).

2. The fan-shaped water spray gun for waterproofing test of prefabricated wall joints according to claim 1, characterized in that: The transverse torsion spring channel (32) has an annular inner edge (33) in the middle. A fixed shaft (15) passes through the transverse torsion spring channel (32) coaxially. The two ends of the fixed shaft (15) are fixed to the inner wall of the spherical shell cover (19). The inner ring of the annular inner edge (33) is rotatably engaged with the fixed shaft (15). The fixed shaft (15) is coaxially fitted with torsion springs (35) located on both sides of the annular inner edge (33). The two ends of each torsion spring (35) are respectively fixedly connected to the inner wall of the spherical shell cover (19) and the annular inner edge (33). Both torsion springs (35) apply a counterclockwise torque to the spherical nozzle (18), thereby causing the spherical nozzle (18) to have a tendency to rotate counterclockwise around the fixed shaft (15).

3. The fan-shaped water spray gun for waterproofing test of prefabricated wall joints according to claim 2, characterized in that: In the initial state, neither the counterclockwise nor the clockwise end of the arc-shaped narrow groove (12) reaches the exposure range of the exposure port (20).

4. The fan-shaped water spray gun for waterproofing test of prefabricated wall joints according to claim 3, characterized in that: Based on the initial state, after the spherical nozzle (18) rotates clockwise by a° around the fixed axis (15), a section of the arc-shaped narrow groove (12) near the clockwise end reaches the exposure range of the exposure port (20), and the fan-shaped annular nozzle (21) leaves the exposure range of the exposure port (20).

5. The fan-shaped water spray gun for waterproofing test of prefabricated wall joints according to claim 1, characterized in that: The counterclockwise and clockwise ends of the arc-shaped narrow groove (12) are both connected to the annular nozzle (21) through two liquid guiding channels (22).

6. The fan-shaped water spray gun for waterproofing test of prefabricated wall joints according to claim 5, characterized in that: The inner walls of the front and rear ends of the spherical shell cover (19) are respectively slidably sealed to the outer spherical surface of the spherical nozzle (18) by the first O-ring (23) and the second O-ring (13); the first O-ring (23) and the second O-ring (13) are both coaxial with the spray gun tube (3).

7. A method of using a fan-shaped water spray gun for waterproofing test of prefabricated wall joints according to claim 6, characterized in that: When the three-way solenoid valve (6) enters state a, the operator holds the spray gun pipe (3) and sprays horizontal fan-shaped water spray from the fan-shaped nozzle (21) towards the horizontal joint (30.1) of the prefabricated wall (50). Then, the operator observes whether there is water leakage at the corresponding horizontal joint (30.1) on the back of the prefabricated wall (50). If there is no water leakage, it means that the splicing process of the horizontal joint (30.1) is qualified. When the three-way solenoid valve (6) switches from state a to state b, the arc-shaped narrow groove (1) 2) When a section near the clockwise end reaches the exposure range of the exposure port (20), the operator holds the spray gun pipe (3) and sprays a longitudinal fan-shaped water spray from a section near the clockwise end of the arc narrow groove (12) towards the longitudinal joint (30.2) of the prefabricated wall (50). Then observe whether there is water seepage at the corresponding longitudinal joint (30.2) on the back of the prefabricated wall (50). If there is no water seepage, it means that the splicing process of the longitudinal joint (30.2) is qualified.

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