Spray head structure and mine watering cart

Abstract

The utility model discloses a shower nozzle structure and a mine sprinkler, the shower nozzle structure comprises a shower nozzle capable of automatically resetting and a thrust part, the shower nozzle capable of automatically resetting comprises a hollow shell and a resetting structure arranged in the shell; the shell is provided with a water inlet and a water outlet; the reset structure comprises a piston assembly I and a spring; a fixed part of the thrust part is installed on the top of the shell, a movable part of the thrust part is located above the piston assembly I, the movable part moves downwards to make contact with the piston assembly I. When the downward pressure exerted on the piston assembly I by the movable part and the spring jointly is larger than the upward thrust exerted on the piston assembly I by liquid flowing in from the water inlet, the piston assembly I is stopped from moving downwards. The piston assembly I is pressed at the water inlet, so that the water inlet is not communicated with the water outlet, and the spray head is in a closed state. The sprinkler nozzle is closed through hydraulic control, reliability and stability are improved, the failure rate is reduced, and waste of water sources is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a spray head structure belongs to mining water sprinkling truck technical field. BACKGROUND

[0002] The mining water sprinkling truck is a kind of equipment frequently used in the field of mine machinery, as the road in mining area is not paved, and the road is prone to a lot of dust, so the mining water sprinkling truck is needed to spray the road surface to suppress dust, and the mining water sprinkling truck also has the functions of fire fighting and greening in mining area, and the spray head of the commonly used water sprinkling truck is connected with pipeline, and electric control butterfly valve is configured on the pipeline, when it is needed to switch the spray head of different positions to open (or close) water outlet, the butterfly valve on the corresponding pipeline is opened (or closed). In this control mode, when the butterfly valve fails, it will cause water supply failure or water supply stop failure, and the opening state of the butterfly valve cannot be monitored, which not only increases the maintenance cost and related time and labor cost, but also may waste water resources, greatly reduces the use feeling. SUMMARY

[0003] The utility model aims at providing a kind of spray head structure, utilize hydraulic control to close water sprinkling truck spray head, improve reliability and stability, reduce failure rate, avoid the waste of water source.

[0004] The utility model is realized according to the following technical scheme:

[0005] First, the utility model provides a kind of spray head structure, including the spray head that can be automatically reset and thrust part, the spray head that can be automatically reset includes hollow shell and reset structure installed in the shell;The shell has water inlet and water outlet;The reset structure includes piston assembly I and spring;The fixed part of the thrust part is installed at the top of the shell, and the moving part of the thrust part is located above the piston assembly I, the moving part is contacted with piston assembly I when moving downward, when the downward pressure of piston assembly I received by moving part and spring is greater than the upward thrust of piston assembly I received by liquid flowing into water inlet, the piston assembly I is pressed at the water inlet, so that water inlet and water outlet are not connected, and the spray head is in closed state.

[0006] In some embodiments, the thrust part is a hydraulic cylinder, the fixed part of the hydraulic cylinder is composed of cylinder body and cylinder cover, and the moving part of the hydraulic cylinder is piston assembly II;The piston assembly II includes piston II and piston rod, the piston II can move up and down in the cylinder body, and the top of the piston rod is fixed with the piston II and can move up and down with the piston II;The bottom of the piston II is contacted with piston assembly I to press piston assembly I at the water inlet.

[0007] In some embodiments, a positioning component is arranged between the bottom surface of the piston II and the top surface of the center bolt in the piston assembly I, so that the central axes of the two can coincide.

[0008] In some embodiments, the bottom surface of the piston II is provided with a protrusion, and the top surface of the center bolt is provided with a groove with the same profile as the protrusion, and the protrusion is inserted into the groove to form the positioning component.

[0009] In some embodiments, the cylinder cover is composed of a cover plate and a cylindrical plate coaxially arranged with the cover plate and with an outer diameter smaller than that of the cover plate; an outer thread is arranged on the radial outer peripheral surface of the cylindrical plate, and an inner thread is arranged on the radial inner peripheral surface of the cylinder body, and the cylinder cover is screwed onto the cylinder body through the inner and outer thread cooperation, and a sealing component is arranged between the cover plate and the open end surface of the cylinder body.

[0010] In some embodiments, the lateral section of the piston II is of a concave structure, the piston II is provided with a central through hole, and the upper part of the piston rod is a stepped rod with a narrow upper part and a wide lower part, the upper part of the piston rod is inserted into the central through hole until the stepped component of the piston rod abuts against the bottom surface of the piston II; an outer thread is arranged on the upper part of the piston rod, and the piston II and the piston rod are fixed together through a rod end lock nut.

[0011] In some embodiments, a sealing component capable of moving with the piston II is arranged between the peripheral surfaces of the piston II and the cylinder body, so as to isolate the internal cavity of the cylinder body into a lower rod cavity and an upper rodless cavity; a rodless cavity oil port is arranged on the cylinder cover, and a rod cavity oil port is arranged on the cylinder body, and the rodless cavity oil port and the rod cavity oil port are connected to a hydraulic oil passage through a joint and a hose; a piston guide ring capable of moving with the piston II is arranged between the peripheral surfaces of the piston II and the cylinder body, so as to prevent the piston II from directly contacting and rubbing with the cylinder body during movement.

[0012] In some embodiments, a monitoring device for monitoring the movement of the piston II is arranged in the lower region of the cylinder body, and when the piston II moves into the range of the monitoring device, the monitoring device remotely transmits the position of the piston II to a display in the cab.

[0013] In some embodiments, the shell comprises a nozzle body, a pipeline joint for connecting with the water passage of the watering truck, and a gland; the nozzle body is of an annular structure, and the water outlet is arranged on the radial surface thereof; the pipeline joint is of an annular structure, and the central hole thereof serves as the water inlet and is fixed coaxially with the lower end axial surface of the nozzle body; the gland is of a semi-closed structure, and the lower end opening surface thereof is fixed coaxially with the upper end axial surface of the nozzle body; the cylinder body is connected with the gland, and the two are designed in an integrated manner.

[0014] In the second aspect, the utility model provides a mine watering truck which is provided with the above-mentioned nozzle structure.

[0015] The utility model has the advantages of:

[0016] 1. The hydraulic cylinder is used for controlling the water flow of the closed local nozzle, switching different water spraying states, avoiding the high failure rate of the electric control butterfly valve in the water spraying state, being suitable for the mine water spraying state, and improving the product reliability.

[0017] 2. The device for monitoring the movement of the piston is added at the hydraulic cylinder, so that the position of the piston of the hydraulic cylinder can be monitored at any time.

[0018] 3. The hydraulic cylinder nozzle is integrally designed, the structure is simple, the arrangement of other elements in the system is reduced, and the cost is reduced.

[0019] 4. The piston movement nozzle immediately closes the water spraying state, avoids the waste of the water source in the water supply pipeline, and saves the water consumption. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which are part of the present utility model, serve to provide a further understanding of the present utility model, the schematic embodiments of the present utility model and the description thereof serve to explain the present utility model, but do not constitute an improper limitation on the present utility model. Obviously, the drawings described below are only some embodiments, and other drawings can be obtained according to the drawings without creative labor for those skilled in the art.

[0021] In the drawings:

[0022] Figure 1 It is a sectional view of the nozzle structure of the present utility model;

[0023] Figure 2 It is an exploded view of the nozzle structure of the present utility model;

[0024] Figure 3 It is a schematic view of the adjusting ring and the adjusting knob of the present utility model;

[0025] Figure 4 It is a schematic view of the change of the water flow direction of the nozzle structure of the present utility model;

[0026] Figure 5 It is a schematic view of the change of the water flow size of the nozzle structure of the present utility model.

[0027] Figure identification: 1, rod end lock nut, 2, piston guide ring, 3, sealing ring, 4, rod cavity oil port, 5, gasket, 6, spring, 7, nut, 8, air vent, 9, piston assembly, 10, nozzle body, 11, adjusting ring, 11.1, through hole, 11.2, threaded hole, 12, adjusting knob, 13, sealing ring, 14, bolt, 15, nozzle water inlet, 16, pipe joint, 17, bolt, 18, sealing gasket, 19, nozzle water outlet, 20, piston, 21, diaphragm, 22, pressure plate, 23, gasket, 24, piston rod, 25, gland, 26, monitoring device, 27, hydraulic cylinder piston, 28, cylinder body, 29, sealing ring, 30, rodless cavity oil port, 31, cylinder cover.

[0028] It should be noted that the drawings and the written description are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application by referring to specific embodiments. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0030] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the device or element indicated to have a specific orientation, to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0031] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] The present application provides a nozzle structure, through the integrated design of hydraulic cylinder nozzle, the hydraulic cylinder is arranged at the top of the nozzle, the movement of the piston in the hydraulic cylinder is used to prevent the movement of the nozzle piston assembly, the closing of the nozzle in different states is realized, and the device for monitoring the movement of the piston is increased on the side of the hydraulic cylinder, so that the position of the piston can be monitored at any time.

[0033] The technical solutions are further described below with reference to the drawings.

[0034] As shown in Figure 1 , Figure 2 , the cylinder cover 31 is located on the top of the nozzle, and is connected with the cylinder body 28 through threads. The cylinder cover 31 is externally threaded, and the cylinder body 28 is internally threaded. The lower end of the cylinder cover 31 is provided with a groove for mounting a sealing ring 29. The sealing ring 29 seals the end surface of the cylinder cover 31 and the cylinder body 28 in contact, so as to prevent the hydraulic oil from leaking. The top of the cylinder cover 31 is provided with a rodless cavity oil port 30, and the side of the cylinder body 28 is provided with a rod cavity oil port 4. The two oil ports can be connected to the pipeline through a joint and a hose.

[0035] The cylinder body 28 and the gland 25 are designed as a whole, and simultaneously play the functions of the hydraulic cylinder body and the nozzle gland.

[0036] The hydraulic cylinder piston 27 moves up and down in the cylinder body 28. The rod end lock nut 1 fixes the upper end of the piston rod 24 and the hydraulic cylinder piston 27 together. The movement of the hydraulic cylinder piston 27 drives the movement of the piston rod 24. The sealing ring 3 can separate the rod cavity and the rodless cavity in the cylinder body, so as to prevent internal leakage. The piston guide ring 2 is used to prevent the hydraulic cylinder piston 27 from directly contacting and rubbing with the cylinder body 28 during movement, so as to protect the cylinder body 28 and the hydraulic cylinder piston 27 from being damaged. The side of the cylinder body 28 is also connected with a monitoring device 26, which is used to monitor the movement of the hydraulic cylinder piston 27. When the hydraulic cylinder piston 27 moves to the range of the monitoring device 26, the monitoring device 26 sends a signal, so that the driver can monitor the position of the hydraulic cylinder piston 27 at any time in the cab.

[0037] The gland 25 can limit the movement of the piston assembly 9. When the piston assembly 9 moves to the position where the pressing plate 22 contacts with the gland 25, the movement of the piston assembly 9 is limited by the gland 25, and the piston assembly 9 stops moving, so as to prevent the diaphragm 21 from being damaged due to excessive deformation caused by excessive movement stroke of the piston assembly 9. The upper part of the pressing plate 22 is conical, and the inner wall of the gland 25 is also conical. The two conical surfaces are parallel, and play a guiding role when the piston assembly 9 moves upward, so as to facilitate the automatic centering of the pressing plate 22 and the gland 25, and prevent the piston assembly 9 from being eccentric relative to the gland 25 and failing to be centered in the repeated rising and falling process. The side of the gland 25 is also provided with an air vent 8. When the piston assembly 9 moves up and down, the cavity between the diaphragm 21 and the gland 25 can flow air freely through the air vent 8 and the atmosphere, so that the cavity always maintains atmospheric pressure, prevents the cavity from forming negative pressure or positive pressure due to the movement of the piston assembly 9, and affects the service life of the diaphragm 21. If the nozzle is damaged, the water below the diaphragm 21 leaks to the upper part of the diaphragm 21, and the leaked water flows to the outside of the nozzle through the air vent 8. At this time, the air vent 8 also plays a role of fault prompt. When the air vent 8 leaks water, it means that the nozzle is damaged and needs to be repaired in time.

[0038] Piston assembly 9 is a component consisting of piston 20, sealing washer 18, diaphragm 21, pressure plate 22, and washer 23 connected sequentially by bolts 17 and secured by nuts 7. It moves up and down as a whole when the nozzle is in different states. Bolt 17 not only connects the piston assembly 9 as a whole, but its upper part is machined into a groove corresponding to the lower protrusion of piston rod 24. When piston rod 24 moves down to contact the groove of bolt 17, it restricts the movement of piston rod 24. The upper surface of pressure plate 22 has a groove, and one end of spring 6 is installed in the groove to prevent spring 6 from sliding and to provide positioning. The other end of spring 6 contacts washer 5, and washer 5 contacts the top surface of the inner cavity of pressure cap 25. The inner cavity guides spring 6, preventing it from becoming eccentric or misaligned during installation and use. Diaphragm 21, located between nozzle body 10 and pressure cap 25, is made of rubber and can deform appropriately with the movement of piston assembly 9. Because diaphragm 21 is made of rubber, it also provides a sealing function. The lower part of the piston 20 is made into a conical boss, which can guide the piston assembly 9 when it moves down, so as to facilitate the automatic alignment of the piston 20 and the nozzle body 10. The sealing gasket 18 can prevent water at the nozzle inlet 15 from entering the spring cavity of the gland 25 through the gap between the bolt 17 and the piston 20.

[0039] The nozzle body 10 has a threaded hole on its lower end face and a through hole on its pipe joint 16. The nozzle body 10 and the pipe joint 16 are fastened together by bolts 14. The other end of the pipe joint 16 is connected to the water circuit of the sprinkler truck to supply water to the nozzle. The lower end of the nozzle body 10 has a groove for installing a sealing ring 13. The sealing ring 13 seals the end face of the nozzle body 10 and the pipe joint 16 to prevent water leakage from the end face of the nozzle body 10 and the pipe joint 16.

[0040] Under normal conditions, both the rodless chamber port 30 and the rod chamber port 4 are connected to the oil tank via connectors and hoses, and the hydraulic cylinder piston 27 is located in... Figure 1 As shown, the piston assembly 9 is subjected to downward pressure from the spring 6. Under the pressure of the spring 6, the piston assembly 9 is in close contact with the nozzle body 10, forming a closed space. The water at the nozzle inlet 15 is blocked at the piston assembly 9 and cannot reach the nozzle outlet 19. The nozzle inlet 15 and the nozzle outlet 19 are not connected. At this time, the nozzle is in a closed state and cannot spray water.

[0041] When the water spray is activated, both the rodless chamber port 30 and the rod chamber port 4 are connected to the oil tank via connectors and hoses, and the hydraulic cylinder piston 27 is located in... Figure 1The water pressure at the inlet 15 of the nozzle head creates an upward thrust on the piston assembly 9, while the piston assembly 9 is also subjected to the downward pressure of the spring 6. When the upward thrust of the water pressure on the piston assembly 9 is greater than the downward pressure of the spring 6, the piston assembly 9 can overcome the pressure of the spring 6 and move upward. At this time, the piston 20 will gradually separate from the nozzle body 10. When the piston assembly 9 moves to contact the gland 25, it will be limited by the gland 25 and stop moving. At this time, the piston assembly 9 reaches the maximum displacement, and the lower inlet 15 of the nozzle head is connected to the outlet 19 of the nozzle head. The water in the pipeline reaches the outlet 19 of the nozzle head through the inlet 15 of the nozzle head. At this time, the nozzle is in an open state. The water outlet direction and size at the outlet 19 of the nozzle head can be changed by adjusting the knob 12. When the knob 12 is not fastened, the position of the adjusting ring 11 can be moved. By rotating the adjusting ring 11 left and right and up and down, the water outlet direction and size can be changed. After adjustment, the adjusting ring 11 is fastened in place by turning the knob 12.

[0042] When only the water spraying state of the current nozzle is closed, and the nozzles at other positions are normally spraying water, the water pump is normally working, and the hydraulic cylinder part of the current nozzle also starts to work. At this time, the rod cavity oil port 4 is connected to the oil tank through the joint in the pipeline, and the rodless cavity oil port 30 is connected to the pressure oil port. The pressure oil enters the inside of the cylinder body 28 through the rodless cavity oil port 30 and acts on the upper end face of the hydraulic cylinder piston 27. The hydraulic cylinder piston 27 is only subjected to the downward pressure of the current hydraulic oil. At this time, the hydraulic cylinder piston 27 moves downward under the action of the pressure oil. The piston rod 24 is connected to the hydraulic cylinder piston 27 through the rod end lock nut 1 and also moves downward under the drive of the hydraulic cylinder piston 27. When the piston rod 24 moves to contact the groove of the lower bolt 17, the piston rod 24 stops moving due to the limitation of the bolt 17. The bolt 17 is subjected to the downward pressure from the piston rod 24. The downward pressure of the piston rod 24 indirectly acts on the piston assembly 9. The piston assembly 9 is also subjected to the upward thrust of the water pressure at the inlet 15 of the nozzle head and the downward pressure of the spring 6. At this time, the downward pressure of the piston rod 24 and the downward pressure of the spring 6 on the piston assembly 9 are much greater than the upward thrust of the water pressure. Therefore, the piston assembly 9 is in the state shown in the figure, the piston assembly 9 and the nozzle body 10 are in contact to form a sealing surface, the water at the inlet 15 of the nozzle head is blocked at the piston assembly 9 and cannot reach the outlet 19 of the nozzle head. The inlet 15 of the nozzle head is not connected to the outlet 19 of the nozzle head, and the nozzle is in a closed state and cannot spray water. Figure 1

[0043] ​When the water spraying state is started again, the rodless cavity oil port 30 and the rod cavity oil port 4 are connected to the oil tank through the joint and the hose, the hydraulic cylinder piston 27 is located at the lower side of the cylinder body 28, the lower end of the piston rod 24 is in contact with the groove of the bolt 17. When the water pressure at the water inlet 15 of the nozzle is established, the water pressure generates an upward thrust on the piston assembly 9, and at the same time, the piston assembly 9 is subjected to the downward pressure of the spring 6. When the upward thrust of the water pressure on the piston assembly 9 is greater than the downward pressure of the spring 6, the piston assembly 9 can move upward to overcome the pressure of the spring 6. At this time, the piston 20 will gradually separate from the nozzle body 10. Since the bolt 17 is in contact with the piston rod 24, when the piston assembly 9 moves upward, the piston rod 24 will also move upward. When the piston assembly 9 moves to the position of contacting the gland 25, the piston assembly 9 will be limited by the gland 25 and stop moving to reach the maximum displacement. At this time, the hydraulic cylinder piston 27 is located at the upper side of the cylinder body 28, and the lower water inlet 15 of the nozzle is connected to the water outlet 19 of the nozzle. The water in the pipeline reaches the water outlet 19 of the nozzle through the water inlet 15 of the nozzle. At this time, the nozzle is in the open state.

[0044] Figure 3 The adjusting ring 11 is placed outside the nozzle body 10. One side of the adjusting ring 11 is a through hole 11.1, and the other side is a threaded hole 11.2. The adjusting knob 12 is also provided with a thread. After the adjusting knob 12 is screwed into the threaded hole 11.2 of the adjusting ring 11, the adjusting ring 11 will be fastened. When the adjusting knob 12 is not tightened, the position of the adjusting ring 11 can be adjusted. When the adjusting ring 11 is rotated left and right, the gap width between the adjusting ring 11 and the nozzle body 10 changes, so that the direction of the water flow of the water outlet 19 of the nozzle can be adjusted, as shown in Figure 4 When the adjusting ring 11 moves up and down, the gap height between the adjusting ring 11 and the nozzle body 10 changes, so that the size of the water flow of the water outlet 19 of the nozzle can be adjusted, as shown in Figure 5 When the adjusting ring 11 is adjusted to the right position, the adjusting knob 12 is turned, and the adjusting ring 11 is fixed at the appropriate position.

[0045] In summary, the utility model provides a nozzle structure, which realizes the following functions and effects:

[0046] 1. The water flow of the local nozzle is controlled by the hydraulic cylinder to switch different water spraying states, so that the problem of high failure rate of the electric control butterfly valve in the water spraying state is avoided, the product reliability is improved, and the utility model is suitable for mining water spraying conditions.

[0047] 2. The device for monitoring the movement of the piston is added at the hydraulic cylinder, so that the position of the hydraulic cylinder piston can be monitored at any time.

[0048] 3. The hydraulic cylinder and the nozzle are designed in an integrated manner, the structure is simple, the arrangement of other elements in the system is reduced, and the cost is reduced.

[0049] 4. The piston moves the spray head to immediately close the water supply, avoiding water waste in the water supply pipeline, saving water.

[0050] 5. By rotating the adjusting knob, the size and direction of the spray head outlet can be adjusted, and the adjusting method is simple and convenient, easy to operate.

[0051] The mine watering cart provided by the utility model is described below, and the mine watering cart described below can be correspondingly referred to the spray head structure described above.

[0052] The mine watering cart provided by the utility model can comprise the spray head structure described in any one of the above embodiments.

[0053] The beneficial effects achieved by the mine watering cart provided by the utility model are consistent with the beneficial effects achieved by the spray head structure provided by the utility model, and thus will not be described here.

[0054] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the specification.

[0055] In addition, those skilled in the art can understand that although some embodiments described herein include certain features contained in other embodiments but not other features, combinations of features of different embodiments also mean to be within the protection scope of the utility model and form different embodiments. For example, in the above embodiments, those skilled in the art can use in a combined manner according to the known technical solutions and the technical problems to be solved by the present application.

[0056] The above is only the preferred embodiment of the utility model, and does not limit the utility model in any form, although the utility model has been disclosed as above with the preferred embodiment, however, it is not used to limit the utility model, any skilled person in the art can make some changes or modifications for equivalent embodiments with the above prompt technical content without departing from the technical solution range of the utility model, as long as it does not depart from the technical solution of the utility model, according to the technical essence of the utility model, any simple modification, equivalent change and modification of the above embodiments, still belongs to the range of the utility model scheme.

Claims

1. A spray head structure comprising a self-resetting spray head, the self-resetting spray head comprising a hollow shell and a reset structure installed in the shell; the shell having a water inlet and a water outlet; the reset structure comprising a piston assembly I and a spring; characterized in that Further comprising a thrust component, a fixed part of the thrust component being installed at the top of the shell, a moving part of the thrust component being located above the piston assembly I, the moving part moving downward to contact the piston assembly I, when the downward pressure on the piston assembly I from the moving part and the spring is greater than the upward thrust on the piston assembly I from the liquid flowing into the water inlet, the piston assembly I is compressed at the water inlet, so that the water inlet is not connected with the water outlet, and the spray head is in a closed state.

2. The spray head structure according to claim 1, characterized in that: the thrust component is a hydraulic cylinder, the fixed part of the hydraulic cylinder is composed of a cylinder body and a cylinder cover, and the moving part of the hydraulic cylinder is a piston assembly II; the piston assembly II comprises a piston II and a piston rod, the piston II is capable of moving up and down in the cylinder body, the top of the piston rod is fixed with the piston II and is capable of moving up and down with the piston II; the bottom of the piston II contacts the piston assembly I to compress the piston assembly I at the water inlet.

3. The spray head structure according to claim 2, characterized in that: a positioning component is arranged between the bottom surface of the piston II and the top surface of the center bolt in the piston assembly I, so that the center axes of the two can coincide.

4. The spray head structure according to claim 3, characterized in that: the bottom surface of the piston II is provided with a protrusion, the top surface of the center bolt is provided with a groove with the same profile as the protrusion, and the protrusion is inserted into the groove to form the positioning component.

5. The spray head structure according to claim 2, characterized in that: the cylinder cover is composed of a cover plate and a cylindrical plate coaxially arranged with the cover plate and having an outer diameter smaller than that of the cover plate; an outer thread is arranged on the radial outer peripheral surface of the cylindrical plate, an inner thread is arranged on the radial inner peripheral surface of the cylinder body, the cylinder cover is screwed on the cylinder body through the inner and outer thread cooperation, and a sealing component is arranged between the cover plate and the open end surface of the cylinder body.

6. The spray head structure according to claim 2, characterized in that: the lateral cross section of the piston II is a concave structure, the piston II is provided with a center through hole, and the piston rod is a stepped rod with a narrow upper part and a wide lower part; the upper part of the piston rod is inserted into the center through hole until the stepped component of the piston rod abuts against the bottom surface of the piston II; an outer thread is arranged on the upper part of the piston rod, and the piston II and the piston rod are fixed together through a rod end lock nut.

7. The spray head structure according to claim 2, characterized in that: a sealing component capable of moving with the piston II is installed between the peripheral surfaces of the piston II and the cylinder body opposite to each other, so as to isolate the internal cavity of the cylinder body into a lower rod cavity and an upper rodless cavity; a rodless cavity oil port is arranged on the cylinder cover, and a rod cavity oil port is arranged on the cylinder body; the rodless cavity oil port and the rod cavity oil port are connected to a hydraulic oil circuit through a connector and a hose. The piston II and the cylinder body opposite the circumferential surface between the installation can follow the piston II together with the piston guide ring, used to prevent the piston II in the process of moving and friction with the cylinder body directly.

8. The shower head structure according to claim 2, characterized in that: The lower area of the cylinder body is provided with monitoring device for monitoring the movement of piston II, when the piston II moves to the scope of monitoring device, monitoring device will be transmitted to the driver's cabin on the display of piston II position.

9. The shower head structure according to claim 2, characterized in that: The shell comprises a shower head body, a pipe joint for connecting with the water line of the watering car and a gland; the shower head body is annular structure, and the radial surface thereof is provided with the water outlet; the pipe joint is annular structure, and the central hole thereof is used as the water inlet and fixed coaxially with the lower end axial surface of the shower head body; the gland is semi-closed structure, and the lower end opening surface thereof is fixed coaxially with the upper end axial surface of the shower head body; The cylinder body is connected with the gland, and the two are integrated design.

10. A mine watering car, characterized in that: The shower head structure according to any one of claims 1 to 9 is installed.

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