Replaceable sand passing air pipe structure

Abstract

The utility model relates to a replaceable sand passing air pipe structure, and belongs to the field of dental instruments. Comprising a three-way pipe replacing mechanism, a two-way pipe replacing mechanism, an internal sand passing air pipe, an air blocking valve and a shell, the three-way pipe replacing mechanism and the two-way pipe replacing mechanism are installed on the side walls of the two ends of the shell in a one-to-one correspondence mode, and the internal sand passing air pipe is arranged in the shell; the two ends of the air blocking valve are detachably connected with the three-way pipe replacing mechanism and the two-way pipe replacing mechanism in a one-to-one correspondence mode, and the air blocking valve penetrates through the shell and is connected with the internal sand passing air pipe in a clamped mode. According to the three-way pipe replacing mechanism, the broken internal sand passing air pipe can be conveniently detached, the convenience for a user to replace the internal sand passing air pipe by himself / herself is improved, in addition, the three-way pipe replacing mechanism is also beneficial to connecting one of the reserved channels with high-pressure air and blowing air into the sand passing air pipe to remove blockage during overhaul and maintenance, and the probability of sand blasting blockage is reduced.

Description

Technical Field

[0001] This utility model relates to the field of dental instruments, and in particular to a replaceable sand-passing air tube structure. Background Technology

[0002] A dental air polisher is a dental instrument used to whiten teeth, enhance their shine, remove stains, plaque, tea stains, tobacco stains, and food debris. During use, the dental air polisher requires an airlock valve mechanism to control the air supply to the air tube, thereby controlling the airflow from the air polishing handle to either stop or allow air to pass through.

[0003] However, due to the repeated use of the airlock valve, the affected part of the air pipe on the sand-passing tube is prone to rupture and leakage, causing sand powder to spray out of the machine. Moreover, once the sand-passing tube ruptures, it is difficult for the user to replace and must be sent back to the manufacturer for repair, seriously affecting the use of the machine. In addition, during daily use, dental sandblasting machines often experience blockages in the internal sand-passing tubes due to moisture in the sand powder or improper use by the user, and once blocked, the user cannot clear the blockage themselves. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a replaceable sand-passing air pipe structure to solve the above-mentioned problem.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A replaceable sand-passing air pipe structure includes: a three-way pipe-changing mechanism, a two-way pipe-changing mechanism, an internal sand-passing air pipe, an airlock valve, and a housing. The three-way pipe-changing mechanism and the two-way pipe-changing mechanism are installed on the two end side walls of the housing respectively. The internal sand-passing air pipe is disposed inside the housing, and its two ends are detachably connected to the three-way pipe-changing mechanism and the two-way pipe-changing mechanism respectively. The airlock valve passes through the housing and is engaged with the internal sand-passing air pipe.

[0006] The beneficial effects of this utility model are as follows: the internal sand-passing air pipe is set inside the outer shell, and its two ends are detachably connected to the three-way pipe-changing mechanism and the two-way pipe-changing mechanism, which is conducive to controlling the air output or stop of the sandblasting handle while cooperating with the air-locking valve. It is also convenient to remove the broken internal sand-passing air pipe, which improves the convenience for users to replace the internal sand-passing air pipe themselves. In addition, the three-way pipe-changing mechanism is also beneficial to reduce the probability of sandblasting blockage by connecting one of the reserved channels to high-pressure air and blowing air into the sand-passing air pipe to remove blockages during maintenance.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the three-way pipe changing mechanism includes: a three-way connector, three first locking elements, and a plug. The three-way connector is disposed inside the housing. The first end of the three-way connector is adapted to pass through one side of the housing. The second end of the three-way connector is detachably connected to one end of the internal sand-passing air pipe. The three first locking elements are detachably connected to the three ports of the three-way connector one by one. The plug is sealed and inserted into the third end of the three-way connector.

[0009] The beneficial effects of adopting the above-mentioned further solution are: the tee connector, in conjunction with the first locking element, helps to fix the tee connector to the side wall of the housing, and the plug, in conjunction with the first locking element, helps to prevent gas from leaking out from the reserved inspection and maintenance port during operation.

[0010] Furthermore, the three-way connector includes: a three-way pipe, a first tracheal connector, and a second tracheal connector. The first tracheal connector is detachably connected to one end of the three-way pipe, and the second tracheal connector is vertically and detachably mounted on the side wall of the three-way pipe. Both the first and second tracheal connectors are connected to the three-way pipe. The three-way pipe and the second tracheal connector are disposed inside the housing. The first tracheal connector is adapted to pass through one side of the housing, and one end of the internal sand-passing tracheal tube is adapted to be inserted into the end of the three-way pipe away from the first tracheal connector.

[0011] The beneficial effects of adopting the above-mentioned further solution are: the three-way pipe combined with the first air pipe connector facilitates the transfer of gas in the internal sand-clearing air pipe, and the three-way pipe combined with the second air pipe connector facilitates the provision of inspection and maintenance ports. By injecting high-pressure air into the sand-clearing air pipe to remove blockages, the probability of sandblasting blockage is reduced.

[0012] Furthermore, one of the first locking members is disposed outside the housing and is threadedly connected to the first air pipe connector, while the other two first locking members are disposed inside the housing and are threadedly connected to the second air pipe connector and the end of the three-way pipe away from the first air pipe connector, respectively.

[0013] The beneficial effects of adopting the above-mentioned further solution are as follows: the first locking member is located outside the outer shell and is threadedly connected to the first air pipe connector, which is conducive to fixing the three-way connector on the side wall of the outer shell; the first locking member is threadedly connected to the second air pipe connector, which is conducive to connecting to the external high-pressure air for unblocking during maintenance; the first locking member is threadedly connected to the end of the three-way pipe away from the first air pipe connector, which is conducive to improving the stability of the internal sand-clearing air pipe and the first air pipe connector.

[0014] Furthermore, the plug is sealed and inserted into the second air pipe connector.

[0015] The advantage of adopting the above-mentioned further solution is that it helps to prevent gas from leaking out from the reserved inspection and maintenance port during operation.

[0016] Furthermore, both the first and second tracheal connectors are threadedly connected to the tee pipe.

[0017] The beneficial effect of adopting the above-mentioned further solution is that it helps to improve the ease of disassembly and assembly between the first tracheal connector, the second tracheal connector, and the three-way tube.

[0018] Furthermore, it also includes a first external sand passage pipe, which passes through the first locking member and is adapted to be inserted into the end of the first air pipe connector that is away from the three-way pipe. The first external sand passage pipe is connected to the three-way pipe, the first air pipe connector, the second air pipe connector and the internal sand passage pipe.

[0019] The beneficial effect of adopting the above-mentioned further solution is that the first external sand-passing gas pipe is adapted to be inserted into the end of the first gas pipe connector that is away from the three-way pipe, which is conducive to realizing the transmission of gas in the internal sand-passing gas pipe.

[0020] Furthermore, the two-way pipe changing mechanism includes a third air pipe connector and two second locking members. The third air pipe connector is adapted to pass through the other side of the housing. The two second locking members are respectively disposed inside and outside the housing and are threadedly connected to both ends of the third air pipe connector. The other end of the internal sand-passing air pipe passes through the second locking members and is adapted to be inserted into one end of the third air pipe connector.

[0021] The beneficial effects of adopting the above-mentioned further solution are: the third air pipe connector, in conjunction with the second locking component, facilitates the fixed installation on the side wall of the outer casing, while improving the stability of the other end of the internal sand-passing air pipe when it is inserted into the third air pipe connector.

[0022] Furthermore, it also includes a second external sand passage pipe, which passes through the second locking member and is adapted to be inserted into the other end of the third air pipe connector. The second external sand passage pipe is connected to the third air pipe connector and the internal sand passage pipe.

[0023] The beneficial effect of adopting the above-mentioned further solution is that the other end of the second external sand-passing gas pipe is adapted to be inserted into the third gas pipe connector, which is conducive to realizing the transmission of gas in the internal sand-passing gas pipe.

[0024] Furthermore, the airlock valve is fixedly installed on the housing, and its output end is located inside the housing and is engaged with the side wall of the internal sand-passing air pipe.

[0025] The beneficial effect of adopting the above-mentioned further solution is that the air lock valve is connected to the internal sand passage air pipe, which facilitates the air output or stop of the sandblasting handle by clamping and loosening the internal sand passage air pipe. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of the overall structure provided for an embodiment of the present utility model.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1. Three-way pipe changing mechanism; 2. Two-way pipe changing mechanism; 3. Internal sand-passing air pipe; 4. Airlock valve; 5. Outer shell; 6. First external sand-passing air pipe; 7. Second external sand-passing air pipe; 11. Three-way pipe; 12. First air pipe connector; 13. Second air pipe connector; 14. First locking element; 15. Plug; 21. Third air pipe connector; 22. Second locking element. Detailed Implementation

[0029] The principles and features of this utility model are described below. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0030] like Figure 1 As shown, this embodiment provides a replaceable sand-passing air pipe structure, including: a three-way pipe-changing mechanism 1, a two-way pipe-changing mechanism 2, an internal sand-passing air pipe 3, an airlock valve 4, and a housing 5. The three-way pipe-changing mechanism 1 and the two-way pipe-changing mechanism 2 are installed on the two end side walls of the housing 5 respectively. The internal sand-passing air pipe 3 is disposed inside the housing 5, and its two ends are detachably connected to the three-way pipe-changing mechanism 1 and the two-way pipe-changing mechanism 2 respectively. The airlock valve 4 passes through the housing 5 and is engaged with the internal sand-passing air pipe 3.

[0031] It should be noted that in the technical solution of this utility model, after the air lock valve 4 is engaged with the internal sand passage air pipe 3, the air output or stop of the sandblasting handle can be achieved by clamping and loosening the internal sand passage air pipe 3.

[0032] In addition, this embodiment also includes a cover that is detachably connected to the housing 5, which is used to block the internal structure of the housing 5 during operation and prevent the external environment from interfering with the internal structure of the housing 5.

[0033] The beneficial effects of this utility model are as follows: the internal sand-passing air pipe is set inside the outer shell, and its two ends are detachably connected to the three-way pipe-changing mechanism and the two-way pipe-changing mechanism, which is conducive to controlling the air output or stop of the sandblasting handle while cooperating with the air-locking valve. It is also convenient to remove the broken internal sand-passing air pipe, which improves the convenience for users to replace the internal sand-passing air pipe themselves. In addition, the three-way pipe-changing mechanism is also beneficial to reduce the probability of sandblasting blockage by connecting one of the reserved channels to high-pressure air and blowing air into the sand-passing air pipe to remove blockages during maintenance.

[0034] Preferred, such as Figure 1 As shown, the three-way pipe changing mechanism 1 includes: a three-way connector, three first locking elements 14 and a plug 15. The three-way connector is disposed inside the housing 5. The first end of the three-way connector is adapted to pass through one side of the housing 5. The second end of the three-way connector is detachably connected to one end of the internal sand-passing air pipe 3. The three first locking elements 14 are detachably connected to the three ports of the three-way connector one by one. The plug 15 is sealed and inserted into the third end of the three-way connector.

[0035] It should be noted that in the preferred embodiment of this utility model, the first locking member 14 is a locking nut.

[0036] The advantages of adopting the above preferred solution are: the tee connector and the first locking element help to fix the tee connector to the side wall of the housing, and the plug and the first locking element help to prevent gas from leaking out from the reserved inspection and maintenance port during operation.

[0037] Preferred, such as Figure 1 As shown, the three-way connector includes: a three-way pipe 11, a first tracheal connector 12, and a second tracheal connector 13. The first tracheal connector 12 is detachably connected to one end of the three-way pipe 11. The second tracheal connector 13 is vertically and detachably installed on the side wall of the three-way pipe 11. Both the first tracheal connector 12 and the second tracheal connector 13 are connected to the three-way pipe 11. The three-way pipe 11 and the second tracheal connector 13 are disposed inside the housing 5. The first tracheal connector 12 is adapted to pass through one side of the housing 5. One end of the internal sand-passing tracheal tube 3 is adapted to be inserted into the end of the three-way pipe 11 away from the first tracheal connector 12.

[0038] The advantages of adopting the above-mentioned preferred solution are: the three-way pipe combined with the first air pipe connector facilitates the transfer of gas in the internal sand-clearing air pipe, and the three-way pipe combined with the second air pipe connector facilitates the provision of inspection and maintenance ports. By injecting high-pressure air into the sand-clearing air pipe to remove blockages, the probability of sandblasting blockage is reduced.

[0039] Preferred, such as Figure 1As shown, one of the first locking members 14 is disposed outside the housing 5 and is threadedly connected to the first air pipe connector 12. The other two first locking members 14 are disposed inside the housing 5 and are threadedly connected to the second air pipe connector 13 and the end of the three-way pipe 11 away from the first air pipe connector 12, respectively.

[0040] The advantages of adopting the above-mentioned preferred solution are as follows: the first locking member is located outside the outer shell and is threadedly connected to the first air pipe connector, which is conducive to fixing the three-way connector on the side wall of the outer shell; the first locking member is threadedly connected to the second air pipe connector, which is conducive to connecting to the external high-pressure air for unblocking during maintenance; the first locking member is threadedly connected to the end of the three-way pipe away from the first air pipe connector, which is conducive to improving the stability of the internal sand-clearing air pipe and the first air pipe connector.

[0041] Preferred, such as Figure 1 As shown, the plug 15 is sealed and inserted into the second air pipe connector 13.

[0042] The advantage of adopting the above preferred solution is that it helps to prevent gas from leaking out from the reserved inspection and maintenance port during operation.

[0043] Preferred, such as Figure 1 As shown, both the first tracheal connector 12 and the second tracheal connector 13 are threadedly connected to the three-way pipe 11.

[0044] It should be noted that in the technical solution of this embodiment, when the first tracheal connector 12 and the second tracheal connector 13 are threadedly connected to the three-way pipe 11, it is necessary to ensure a tight seal, that is, gas cannot leak out from the connection between the first tracheal connector 12 and the three-way pipe 11 and the connection between the second tracheal connector 13 and the three-way pipe 11.

[0045] In other embodiments of this utility model, the three-way tube 11, the first tracheal connector 12, and the second tracheal connector 13 can be integrally formed.

[0046] The advantages of adopting the above-mentioned preferred solution are: it helps to improve the ease of disassembly and assembly between the first tracheal connector, the second tracheal connector, and the three-way tube.

[0047] Preferred, such as Figure 1 As shown, it also includes a first external sand passage air pipe 6, which passes through the first locking member 14 and is adapted to be inserted into the end of the first air pipe connector 12 away from the three-way pipe 11. The first external sand passage air pipe 6 is connected to the three-way pipe 11, the first air pipe connector 12, the second air pipe connector 13 and the internal sand passage air pipe 3.

[0048] The beneficial effect of adopting the above-mentioned preferred solution is that the first external sand-passing air pipe is adapted to be inserted into the end of the first air pipe connector that is away from the three-way pipe, which is conducive to realizing the transmission of gas in the internal sand-passing air pipe.

[0049] Preferred, such as Figure 1 As shown, the two-way pipe changing mechanism 2 includes a third air pipe connector 21 and two second locking members 22. The third air pipe connector 21 is adapted to pass through the other side of the outer shell 5. The two second locking members 22 are respectively disposed inside and outside the outer shell 5, and are threadedly connected to both ends of the third air pipe connector 21. The other end of the internal sand-passing air pipe 3 passes through the second locking member 22 and is adapted to be inserted into one end of the third air pipe connector 21.

[0050] It should be noted that in the preferred embodiment of this utility model, the second locking member 22 is a locking nut.

[0051] The advantages of adopting the above-mentioned preferred solution are: the third air pipe connector, in conjunction with the second locking member, facilitates the fixed installation on the side wall of the outer casing, while improving the stability of the connection between the other end of the internal sand-passing air pipe and the third air pipe connector.

[0052] Preferred, such as Figure 1 As shown, it also includes a second external sand passage pipe 7, which passes through the second locking member 22 and is adapted to be inserted into the other end of the third air pipe connector 21. The second external sand passage pipe 7 is connected to the third air pipe connector 21 and the internal sand passage pipe 3.

[0053] The beneficial effect of adopting the above-mentioned preferred solution is that the other end of the second external sand-passing air pipe is adapted to be inserted into the third air pipe connector, which is conducive to realizing the transmission of gas in the internal sand-passing air pipe.

[0054] Preferred, such as Figure 1 As shown, the airlock valve 4 is fixedly installed on the housing 5, and its output end is located inside the housing 5 and is engaged with the side wall of the internal sand-passing air pipe 3.

[0055] The advantages of adopting the above-mentioned preferred solution are: the air lock valve is connected to the internal sand passage air pipe, which facilitates the air output or stop of the sandblasting handle by clamping and loosening the internal sand passage air pipe.

[0056] The working process of this utility model is described below:

[0057] like Figure 1As shown, when the airlock valve 4 continuously clamps or loosens the internal sand-passing air pipe 3, causing the internal sand-passing air pipe 3 to break, the user needs to first remove the cover covering the outer shell 5 to expose the internal structure of the outer shell 5. Then, loosen the first locking member 14, which is threaded to the end of the three-way pipe 11 away from the first air pipe connector 12, and loosen the second locking member 22 located inside the outer shell 5. Next, remove the broken internal sand-passing air pipe 3 from the three-way pipe 11 and the third air pipe connector 21 (it should be noted that the internal sand-passing air pipe 3 is made of soft material and can be disassembled by bending). Finally, cut a new internal sand-passing air pipe 3 of the same length as the broken internal sand-passing air pipe 3, reconnect it to the three-way pipe 11 and the third air pipe connector 21, and tighten the previously loosened first locking member 14 and second locking member 22 to complete the replacement of the internal sand-passing air pipe 3.

[0058] During maintenance, loosen the first locking member 14, which is threadedly connected to the second air pipe connector 13, pull out the plug 15, and connect the external high-pressure gas supply equipment to the second air pipe connector 13. At this time, the first locking member 14 can be tightened again to stably connect the external high-pressure gas supply equipment to the second air pipe connector 13. By injecting high-pressure gas into the three-way pipe 11, the first air pipe connector 12, the internal sand passage pipe 3, the third air pipe connector 21, the first external sand passage pipe 6, and the second external sand passage pipe 7, the blockage can be cleared, reducing the probability of sandblasting blockage.

[0059] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0060] Furthermore, 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 number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0062] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

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

Claims

1. A replaceable sand-passing gas pipe structure, characterized in that, include: The three-way pipe changing mechanism (1), the two-way pipe changing mechanism (2), the internal sand-passing air pipe (3), the airlock valve (4), and the outer shell (5) are installed on the two end side walls of the outer shell (5) in a one-to-one correspondence. The internal sand-passing air pipe (3) is located inside the outer shell (5), and its two ends are detachably connected to the three-way pipe changing mechanism (1) and the two-way pipe changing mechanism (2) in a one-to-one correspondence. The airlock valve (4) passes through the outer shell (5) and is engaged with the internal sand-passing air pipe (3).

2. The replaceable sand-passing gas pipe structure according to claim 1, characterized in that, The three-way pipe changing mechanism (1) includes: a three-way connector, three first locking elements (14) and a plug (15). The three-way connector is disposed inside the housing (5). The first end of the three-way connector is adapted to pass through one side of the housing (5). The second end of the three-way connector is detachably connected to one end of the internal sand-passing air pipe (3). The three first locking elements (14) are detachably connected to the three ports of the three-way connector. The plug (15) is sealed and inserted into the third end of the three-way connector.

3. The replaceable sand-passing gas pipe structure according to claim 2, characterized in that, The three-way connector includes: a three-way pipe (11), a first tracheal connector (12), and a second tracheal connector (13). The first tracheal connector (12) is detachably connected to one end of the three-way pipe (11). The second tracheal connector (13) is vertically and detachably installed on the side wall of the three-way pipe (11). Both the first tracheal connector (12) and the second tracheal connector (13) are connected to the three-way pipe (11). The three-way pipe (11) and the second tracheal connector (13) are disposed inside the outer shell (5). The first tracheal connector (12) is adapted to pass through one side of the outer shell (5). One end of the internal sand-passing tracheal tube (3) is adapted to be inserted into the end of the three-way pipe (11) away from the first tracheal connector (12).

4. The replaceable sand-passing gas pipe structure according to claim 3, characterized in that, One of the first locking parts (14) is disposed outside the housing (5) and threadedly connected to the first air pipe connector (12). The other two first locking parts (14) are disposed inside the housing (5) and are threadedly connected to the second air pipe connector (13) and the end of the three-way pipe (11) away from the first air pipe connector (12).

5. The replaceable sand-passing gas pipe structure according to claim 3, characterized in that, The plug (15) is sealed and inserted into the second air pipe connector (13).

6. The replaceable sand-passing gas pipe structure according to claim 3, characterized in that, Both the first tracheal connector (12) and the second tracheal connector (13) are threadedly connected to the three-way pipe (11).

7. The replaceable sand-passing gas pipe structure according to claim 3, characterized in that, It also includes a first external sand passage pipe (6), which passes through the first locking member (14) and is adapted to be inserted into the end of the first air pipe connector (12) away from the three-way pipe (11). The first external sand passage pipe (6) is connected to the three-way pipe (11), the first air pipe connector (12), the second air pipe connector (13) and the internal sand passage pipe (3).

8. The replaceable sand-passing gas pipe structure according to any one of claims 1-7, characterized in that, The two-way pipe changing mechanism (2) includes a third air pipe connector (21) and two second locking members (22). The third air pipe connector (21) is adapted to pass through the other side of the outer shell (5). The two second locking members (22) are respectively disposed inside and outside the outer shell (5) and are threadedly connected to both ends of the third air pipe connector (21). The other end of the internal sand-passing air pipe (3) passes through the second locking member (22) and is adapted to be inserted into one end of the third air pipe connector (21).

9. The replaceable sand-passing air pipe structure according to claim 8, characterized in that, It also includes a second external sand passage pipe (7), which passes through the second locking member (22) and is adapted to be inserted into the other end of the third air pipe connector (21). The second external sand passage pipe (7) is connected to the third air pipe connector (21) and the internal sand passage pipe (3).

10. The replaceable sand-passing gas pipe structure according to claim 1, characterized in that, The airlock valve (4) is fixedly installed on the housing (5), and its output end is located inside the housing (5) and is engaged with the side wall of the internal sand-passing air pipe (3).

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