Pneumatic mast

Abstract

The present invention discloses a pneumatic mast. The pneumatic mast includes: a multi-stage mast, wherein the multi-stage masts are nested, and the multi-stage masts have air inlets; an air source, which is used to provide gas power to the air inlets to drive the multi-stage masts to be pushed out step by step. According to the pneumatic mast of the present invention, by using the air source to provide gas power to the air inlets to drive the multi-stage masts to be pushed out step by step, the driving of each stage of the mast can be labor-saving and convenient, and there will be no oil leakage phenomenon during hydraulic driving when driven by gas, making the working site cleaner.

Description

Technical Field

[0001] The present invention relates to the technical field of general machinery, and more particularly, to a pneumatic mast. Background Art

[0002] Existing mast devices include multi-stage masts. Each stage of the mast is often driven manually or hydraulically. However, the lifting operation of the manually driven mast is time-consuming and laborious, and the hydraulically driven mast is expensive, and the oil is prone to leakage and cause pollution, which are not conducive to popularization and application. Summary of the Invention

[0003] The present invention aims to solve at least one of the above technical problems in the prior art to some extent. For this purpose, the present invention provides a pneumatic mast, which is convenient to drive the mast and does not leak oil.

[0004] The pneumatic mast according to an embodiment of the present invention includes: a multi-stage mast, the multi-stage masts are nested, and the multi-stage masts have air inlets; a gas source for providing gas power to the air inlets to drive the multi-stage masts to be pushed out step by step.

[0005] The pneumatic mast according to an embodiment of the present invention can make the driving of each stage of the mast labor-saving and convenient, and does not leak oil by using a gas source to provide gas power to the air inlet to drive the multi-stage masts to be pushed out step by step.

[0006] According to some embodiments of the present invention, the gas source and the air inlet are connected by a pipeline.

[0007] Optionally, an air filter and / or an oiler are provided on the pipeline. The air filter is used to filter air impurities, and the oiler is used to add oil mist into the pipeline.

[0008] According to some embodiments of the present invention, a pressure limiting valve is installed on the gas source. The pressure limiting valve is used to feedback a switch value to the gas source to stop or start the gas source.

[0009] Optionally, a pressure valve for adjusting the internal pressure of the pipeline is provided in the pipeline.

[0010] According to some embodiments of the present invention, a safety valve is provided on the mast. When the pressure in the mast is greater than a preset pressure value, the safety valve discharges air.

[0011] According to some embodiments of the present invention, two adjacent stages of the masts are divided into an outer-stage mast located on the outside and an inner-stage mast located on the inside. The inner-stage mast includes: an inner-stage mast body and a sliding part. The sliding part is connected to the inner-stage mast body, and the outer diameter of the sliding part is greater than the outer diameter of the inner-stage mast body. The sliding part is adapted to slidably cooperate with the inner cavity wall of the outer-stage mast.

[0012] Further, at least one sealing ring is provided between the sliding part and the inner cavity wall.

[0013] Optionally, a friction ring is provided between the sliding part and the inner cavity wall.

[0014] According to some embodiments of the present invention, a limiting ring is provided on the inner-stage mast body, the limiting ring is axially spaced apart from the sliding part along the inner-stage mast, both the limiting ring and the sliding part are located inside the outer-stage mast, a stop ring is provided at the end of the outer-stage mast, and the inner diameter of the stop ring is smaller than the outer diameter of the limiting ring.

[0015] Further, a limiting groove extending axially is formed in the stop ring, a limiting protrusion extending axially is provided on the inner-stage mast body, at least a part of the limiting protrusion is located on the side of the limiting ring away from the sliding part, and the limiting protrusion is in embedded fit with the limiting groove.

[0016] According to some embodiments of the present invention, the pneumatic mast further includes: a locking member for locking the relative positions of two adjacent stages of the mast.

[0017] According to some embodiments of the present invention, the bottom of the innermost stage of the mast is a fully enclosed structure, and the bottom of each of the remaining stages of the mast is a semi-enclosed structure or an unenclosed structure.

[0018] According to some embodiments of the present invention, the bottom of each stage of the mast is a semi-enclosed structure or an unenclosed structure.

[0019] According to some embodiments of the present invention, a safety rope is provided inside multiple stages of the mast, one end of the safety rope is connected to the innermost stage of the mast, the other end of the safety rope is connected to the outermost stage of the mast or to the base at the bottom of the outermost stage of the mast, and the length of the safety rope is not greater than the total height of the fully deployed multiple stages of the mast.

[0020] According to some embodiments of the present invention, a valve seat is provided at the bottom of the mast, and the air inlet is opened on the valve seat.

[0021] According to some embodiments of the present invention, a heater is provided at the air inlet.

[0022] According to some embodiments of the present invention, a water discharge channel and a gas discharge channel are opened on the valve seat, both the water discharge channel and the gas discharge channel are communicated with the inside of the mast, a three-way valve is installed on the valve seat, the three-way valve has a first interface, a second interface and a third interface, the first interface is connected to the water discharge channel, the second interface is connected to the gas discharge channel, and the third interface is communicated with the outside.

[0023] According to some embodiments of the present invention, a water and air discharge channel is provided on the valve seat. One end of the water and air discharge channel is communicated with the interior of the mast, and the other end is communicated with the outside.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0025] Figure 1 is a schematic diagram of a pneumatic mast;

[0026] Figure 2 is a nested three-dimensional schematic diagram of a three-stage mast;

[0027] Figure 3 is Figure 2 a partial enlarged schematic diagram at position A in

[0028] Figure 4 a schematic diagram of a locking member;

[0029] Figure 5 is a schematic diagram of the bottom of each stage of the mast.

[0030] Reference Numerals:

[0031] Multi-stage mast 1, innermost stage mast 11, mounting plate 111, second innermost stage mast 12, intermediate stage mast 13, second outermost stage mast 14, outermost stage mast 15, valve seat 151, air inlet 16, mounting support 17, air source 2, pressure limiting valve 21, pipeline 3, air filter 31, oiler 32, pressure valve 33, heater 34, first locking member 41, second locking member 42, third locking member 43, fourth locking member 44, inner stage mast body 51, sliding part 52, limiting ring 53, limiting protrusion 54, stop ring 55, sealing ring 56, friction ring 57. Detailed Embodiments

[0032] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0034] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a connection capable of mutual communication; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The following will Figures 1-5 describe in detail the pneumatic mast according to an embodiment of the present invention.

[0036] Referring to Figure 1 as shown, the pneumatic mast according to an embodiment of the present invention may include: a multi-stage mast 1 and a gas source 2. The multi-stage mast 1 is nested, and the multi-stage mast 1 has an air inlet 16. The gas source 2 is used to provide gas power to the air inlet 16 to drive the multi-stage mast 1 to be pushed out step by step.

[0037] In Figure 1 the embodiment shown, the multi-stage mast 1 includes a five-stage mast, which are, from the inside to the outside: the innermost mast 11, the second innermost mast 12, the middle mast 13, the second outermost mast 14, and the outermost mast 15. The masts at all levels are nested, and the air inlet 16 is provided on the outermost mast 15. The gas source 2 continuously supplies gas to the inside of the mast through the air inlet 16, so that the pressure inside the mast continuously rises until a set pressure value (this pressure value is limited by a pressure valve) is finally reached. The set pressure value acts on the mast to generate an upward thrust, and the set pressure value is slightly greater than the gravity and friction force, thereby pushing the mast upward.

[0038] An installation plate 111 is provided on the innermost mast 11, and a lamp is suitable for being installed on the installation plate 111. Thus, when the masts at all levels are pushed out step by step, the innermost mast 11 can lift the lamp on the installation plate 111 to the highest position. Of course, in some alternative embodiments, other devices can also be installed on the installation plate 111.

[0039] An installation support 17 may be fixedly arranged on the outer surface of the outermost stage mast 15 so as to mount the entire multi-stage mast 1 on the mounting frame.

[0040] For the pneumatic mast according to an embodiment of the present invention, by using the gas source 2 to supply gas power to the air inlet 16 to drive the multi-stage mast 1 to eject stage by stage, the driving of each stage of the mast can be labor-saving and convenient, and there will be no oil leakage phenomenon during hydraulic driving, making the working site cleaner.

[0041] The gas source 2 may be an air compressor, and the air compressor supplies air power to the air inlet 16 to drive the multi-stage mast 1 to eject stage by stage. Referring to Figure 1 as shown, the gas source 2 and the air inlet 16 are connected by a pipeline 3.

[0042] Optionally, referring to Figure 1 as shown, an air filter 31 and / or an oiler 32 are arranged on the pipeline 3. The air filter 31 is used to filter air impurities, and the oiler 32 is used to add oil mist into the pipeline 3. Thus, when the gas enters the mast interior from the gas source 2 through the pipeline 3, the gas can enter the mast interior together with the oil mist to lubricate the mast, making the lifting of the mast smoother.

[0043] Referring to Figure 1 as shown, a pressure limiting valve 21 is installed on the gas source 2. The pressure limiting valve 21 is used to feedback a switch quantity to the gas source 2 to stop or start the gas source 2. When the gas source 2 stops, the gas source 2 does not supply gas to the mast interior; when the gas source 2 starts, the gas source 2 supplies gas to the mast interior. When all the masts have risen to the highest point, at this time the air compressor is still working and the pressure inside the mast continues to rise. When the pressure measured by the pressure limiting valve 21 is greater than the set pressure value, the air compressor is controlled to cut off the power supply to ensure that the mast can work under a safe pressure.

[0044] Optionally, referring to Figure 1 as shown, a pressure valve 33 for adjusting the internal pressure of the pipeline 3 is arranged inside the pipeline 3. The pressure valve 33 is used to adjust the pressure of the gas source to a suitable pressure to lift the mast. When the valve of the pressure valve 33 increases, the rising speed of the mast speeds up. For example, when the valve of the pressure valve 33 decreases, the rising speed of the mast slows down.

[0045] A safety valve is provided on the mast. When the pressure inside the mast is greater than the preset pressure value, the safety valve discharges gas, thereby preventing the mast from continuously rising beyond the limit position and causing damage.

[0046] Two adjacent stages of the mast are divided into an outer stage mast located on the outside and an inner stage mast located on the inside. The inner stage mast includes: an inner stage mast body 51 and a sliding part 52. The sliding part 52 is connected to the inner stage mast body 51, and the outer diameter of the sliding part 52 is greater than the outer diameter of the inner stage mast body 51. The sliding part 52 is adapted to slidably cooperate with the inner cavity wall of the outer stage mast.

[0047] Referring to Figures 2-3 as shown, taking the outermost mast as the outermost mast 15 and the inner mast as the second outermost mast 14 as an example, the second outermost mast 14 includes: an inner mast body 51 and a sliding part 52. The sliding part 52 is connected to the inner mast body 51, and the outer diameter of the sliding part 52 is larger than the outer diameter of the inner mast body 51. The sliding part 52 is adapted to slidably cooperate with the inner cavity wall of the outermost mast 15.

[0048] Further, referring to Figure 3 as shown, at least one sealing ring 56 is provided between the sliding part 52 and the inner cavity wall to achieve the sealing between the inner mast and the outer mast, for example, to achieve the sealing between the second outermost mast 14 and the outermost mast 15.

[0049] Referring to Figure 3 as shown, a friction ring 57 is provided between the sliding part 52 and the inner cavity wall. The friction ring 57 can be used to wipe off large dust on the outer mast. The sealing ring 56 can be provided between two friction rings 57. In this way, these two friction rings 57 can protect the middle sealing ring 56.

[0050] Referring to Figure 3 as shown, a limiting ring 53 is provided on the outer wall of the inner mast body 51. The limiting ring 53 and the sliding part 52 are spaced apart along the axial direction of the inner mast. Both the limiting ring 53 and the sliding part 52 are located inside the outer mast. A stop ring 55 is provided at the end of the outer mast, and the inner diameter of the stop ring 55 is smaller than the outer diameter of the limiting ring 53. When the inner mast rises until the limiting ring 53 abuts against the stop ring 55 of the outer mast, the inner mast can no longer rise.

[0051] Further, referring to Figures 1-3 as shown, a limiting groove extending axially is formed on the stop ring 55, and a limiting protrusion 54 extending axially is provided on the inner mast body 51. At least a part of the limiting protrusion 54 is located on the side of the limiting ring 53 away from the sliding part 52. The limiting protrusion 54 and the limiting groove are fitted together to achieve the guiding function.

[0052] The pneumatic mast further includes: a locking member for locking the relative positions of adjacent two-stage masts. Referring to Figure 1 、 Figure 4 as shown, a first locking member 41 is provided on the second innermost mast 12 for restricting the axial relative position between the second innermost mast 12 and the innermost mast 11; a second locking member 42 is provided on the middle mast 13 for restricting the axial relative position between the middle mast 13 and the second innermost mast 12; a third locking member 43 is provided on the second outermost mast 14 for restricting the axial relative position between the second outermost mast 14 and the middle mast 13; a fourth locking member 44 is provided on the outermost mast 15 for restricting the axial relative position between the outermost mast 15 and the second outermost mast 14.

[0053] In the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0054] Optionally, the locking member can be arranged on the stop ring 55. Threaded through holes are provided on the stop ring 55, and each locking member includes a threaded rod screwed into the corresponding threaded through hole. In this way, by screwing the locking member inward, the relative position of two adjacent levels of masts can be restricted, and by unscrewing the locking member outward, the relative movement of two adjacent levels of masts is not affected. The number of locking members on each stop ring 55 can be one or more.

[0055] Of course, the locking member can also be other electric locking members, which can automatically lock or unlock, improving the degree of automation.

[0056] In some embodiments, the bottom of the innermost level of mast is a fully enclosed structure, and the bottom of each of the remaining levels of masts is a semi-enclosed structure or an unenclosed structure. Refer to Figure 5 As shown, the innermost level of mast is the innermost mast 11, the bottom of the innermost mast 11 is a fully enclosed structure, and the bottoms of the remaining levels of masts, namely the second innermost mast 12, the middle mast 13, the second outermost mast 14, and the outermost mast 15, are semi-enclosed structures. That is to say, ventilation holes are provided at the bottoms of the second innermost mast 12, the middle mast 13, and the second outermost mast 14, and an air inlet hole is provided at the bottom of the outermost mast 15. The gas from the gas source 2 enters the outermost mast 15 through the air inlet hole, pushing the second outermost mast 14 to rise. Then, it passes through the ventilation hole at the bottom of the second outermost mast 14 and reaches the inside of the second outermost mast 14, pushing the middle mast 13 to rise. Then, it passes through the ventilation hole at the bottom of the middle mast 13 and reaches the inside of the middle mast 13, pushing the second innermost mast 12 to rise. Then, it passes through the ventilation hole at the bottom of the second innermost mast 12 and reaches the inside of the second innermost mast 12, pushing the innermost mast 11 to rise, thereby realizing the successive ejection of each level of mast.

[0057] In some other embodiments, the bottom of each stage of the mast is a semi-closed structure or an open structure. An air inlet is provided at the bottom of the outermost stage of the mast 15. The gas from the gas source 2 enters the outermost stage of the mast 15 through the air inlet, pushing the innermost stage of the mast 11 to rise. When the innermost stage of the mast 11 rises to the limit position, the innermost stage of the mast 11 drives the second innermost stage of the mast 12 to rise synchronously; when the second innermost stage of the mast 12 rises to the limit position, the second innermost stage of the mast 12 drives the intermediate stage of the mast 13 to rise synchronously; when the intermediate stage of the mast 13 rises to the limit position, the intermediate stage of the mast 13 drives the second outermost stage of the mast 14 to rise synchronously until the second outermost stage of the mast 14 rises to the limit position, and at this time, the masts of each stage are pushed out step by step.

[0058] A safety rope is arranged inside the multi-stage mast 1. One end of the safety rope is connected to the innermost stage of the mast, and the other end of the safety rope is connected to the outermost stage of the mast or to the base at the bottom of the outermost stage of the mast. The length of the safety rope is not greater than the total height of the fully extended multi-stage mast 1, thereby preventing the gas source 2 from continuously pumping gas into the mast in case the pressure valve 33 or other components fail, resulting in dangerous consequences. When the masts of each stage are in the contracted state, the safety rope is coiled into a spring-like shape and retracted inside the mast. When the masts of each stage are in the extended state, the safety rope is stretched.

[0059] Refer to Figure 1 、 Figure 5 As shown, a valve seat 151 is provided at the bottom of the mast, and the air inlet 16 is opened on the valve seat 151. Optionally, the air inlet 16 is opened on the valve seat 151 of the outermost stage of the mast 15.

[0060] Refer to Figure 1 As shown, a heater 34 is provided at the air inlet 16. The heater 34 can be a resistive heater with a temperature control switch, and is installed at the air inlet 16 at the bottom of the mast. When the pneumatic mast is used in cold regions, the compressed air has a certain temperature due to being worked on. When passing through the pipeline 3, the temperature may decrease, which may cause the pipeline 3 to freeze and block the air passage. The heater 34 can continuously heat the entire interior of the mast to prevent the air passage and the outer wall of the mast from icing.

[0061] In some alternative embodiments, a water discharge channel and a gas discharge channel may be formed on the valve seat 151. Both the water discharge channel and the gas discharge channel are in communication with the interior of the mast. A three-way valve is installed on the valve seat 151. The three-way valve has a first interface, a second interface, and a third interface. The first interface is connected to the water discharge channel, the second interface is connected to the gas discharge channel, and the third interface is in communication with the outside. The water discharge channel can be used to discharge the water inside the mast, and the gas discharge channel can be used to discharge the gas inside the mast. For example, when each stage of the mast needs to be lowered, by controlling the switch, the gas discharge channel is opened, and the compressed air inside the mast is quickly discharged. Since the pressure inside the mast disappears, the mast descends due to the action of gravity. A gas discharge solenoid valve can be provided at the gas discharge channel. By adjusting the valve size of the gas discharge solenoid valve, the descending speed of the mast can be changed. Similarly, a water discharge solenoid valve can be provided at the water discharge channel. By adjusting the valve size of the water discharge solenoid valve, the water discharge speed can be changed.

[0062] In some other alternative embodiments, a water and gas discharge channel is formed on the valve seat 151. One end of the water and gas discharge channel is in communication with the interior of the mast, and the other end is in communication with the outside. The water and gas discharge channel can be used to discharge the water and gas inside the mast. For example, when each stage of the mast needs to be lowered, by controlling the switch, the water and gas discharge channel is opened, and the compressed air inside the mast is quickly discharged. Since the pressure inside the mast disappears, the mast descends due to the action of gravity. A water and gas discharge solenoid valve can be provided at the water and gas discharge channel. By adjusting the valve size of the water and gas discharge solenoid valve, the descending speed of the mast can be changed.

[0063] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0064] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A pneumatic mast, characterized in that, Comprising: A multi-stage mast, with the multi-stage masts nested. The multi-stage masts have air inlets. Adjacent two-stage masts are divided into an outer-stage mast located on the outside and an inner-stage mast located on the inside. The inner-stage mast includes: an inner-stage mast body and a sliding part. The sliding part is connected to the inner-stage mast body, and the outer diameter of the sliding part is greater than the outer diameter of the inner-stage mast body. The sliding part is adapted to slidably cooperate with the inner cavity wall of the outer-stage mast. At least one sealing ring is provided between the sliding part and the inner cavity wall. A friction ring is provided between the sliding part and the inner cavity wall. The sealing ring is provided between two of the friction rings; An air source, which is used to provide gas power to the air inlet to drive the multi-stage mast to eject step by step; A safety rope is provided inside the multi-stage masts. One end of the safety rope is connected to the innermost-stage mast, and the other end of the safety rope is connected to the outermost-stage mast or to the base at the bottom of the outermost-stage mast. The length of the safety rope is not greater than the total height when the multi-stage masts are fully extended; A safety valve is provided on the mast. When the pressure inside the mast is greater than a preset pressure value, the safety valve discharges air.

2. The pneumatic mast according to claim 1, characterized in that, The air source and the air inlet are connected by a pipeline.

3. The pneumatic mast according to claim 2, characterized in that, An air filter and / or an oiler are provided on the pipeline. The air filter is used to filter air impurities, and the oiler is used to add oil mist into the pipeline.

4. The pneumatic mast according to claim 1 or 2, characterized in that, A pressure-limiting valve is installed on the air source. The pressure-limiting valve is used to feedback a switch quantity to the air source to stop or start the air source.

5. The pneumatic mast according to claim 2, characterized in that, A pressure valve for adjusting the internal pressure of the pipeline is provided inside the pipeline.

6. The pneumatic mast according to claim 1, characterized in that, A limiting ring is provided on the inner-stage mast body. The limiting ring and the sliding part are spaced apart along the axial direction of the inner-stage mast. Both the limiting ring and the sliding part are located inside the outer-stage mast. A stop ring is provided at the end of the outer-stage mast, and the inner diameter of the stop ring is smaller than the outer diameter of the limiting ring.

7. The pneumatic mast according to claim 6, characterized in that, The stop ring is provided with an axially extending limiting groove. The inner-stage mast body is provided with an axially extending limiting protrusion. At least part of the limiting protrusion is located on the side of the limiting ring away from the sliding part. The limiting protrusion is in interference fit with the limiting groove.

8. The pneumatic mast according to claim 6, characterized in that, Also comprising: A locking member for locking the relative positions of adjacent two-stage masts.

9. The pneumatic mast according to claim 1, characterized in that, The bottom of the innermost-stage mast is a fully enclosed structure, and the bottom of each of the remaining masts is a semi-enclosed structure or an unenclosed structure.

10. The pneumatic mast according to claim 1, characterized in that, The bottom of each mast is a semi-enclosed structure or an unenclosed structure.

11. The pneumatic mast according to claim 1, characterized in that, A valve seat is provided at the bottom of the mast. The air inlet is opened on the valve seat.

12. The pneumatic mast according to claim 1 or 11, characterized in that, A heater is provided at the air inlet.

13. The pneumatic mast according to claim 11, characterized in that, A water discharge channel and a gas discharge channel are opened on the valve seat. Both the water discharge channel and the gas discharge channel are connected to the inside of the mast. A three-way valve is installed on the valve seat. The three-way valve has a first interface, a second interface and a third interface. The first interface is connected to the water discharge channel, the second interface is connected to the gas discharge channel, and the third interface is communicated with the outside.

14. The pneumatic mast according to claim 11, characterized in that, A water and air discharge channel is provided on the valve seat. One end of the water and air discharge channel is communicated with the interior of the mast, and the other end is communicated with the outside.

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