Elevator buffer

Abstract

The utility model provides an elevator buffer which comprises a plunger barrel and further comprises an end cover arranged on one side of the plunger barrel, an annular groove is formed in the plunger barrel, the elevator buffer further comprises a buffer piece used in cooperation with the plunger barrel, the buffer piece is provided with a switching part and a clamping part, and the clamping part abuts against the inner wall of the annular groove. The buffer part has a first state and a second state, when the buffer part is in the first state, the containing space is in a closed state, when the buffer part is in the second state, the containing space communicates with the outside, and the switching part is used for enabling the buffer part to be switched between the first state and the second state. According to the elevator buffer, it can be guaranteed that the elevator buffer filled with hydraulic oil cannot be leaked in the transportation process, the hydraulic oil does not need to be transported independently, the transportation cost is saved to a great extent, and danger existing in the transportation process is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of elevators, and in particular to an elevator buffer. Background Art

[0002] The elevator buffer is one of the safety components in the elevator safety protection system. The buffer is generally installed in the bottom pit of the shaft. It plays a buffering role when the elevator breaks down or an accident occurs, thereby alleviating the elevator or the people in the elevator from direct impact. The buffers in the existing market generally use buffer plates. Most of the buffer plates adopt an annular structure, and the buffer plates are directly glued to the upper end surface of the plunger barrel with glue. In the prior art, when the elevator buffer is transported, the hydraulic oil is generally injected into the plunger barrel first, and then the buffer plate is glued to the upper end surface of the plunger barrel with glue. There are also air holes on the buffer plate, which are used for exhausting the elevator buffer when it is hit and for taking in air when the buffer is reset. The elevator buffer may shake or tip over during transportation. Due to the existence of the air holes, the hydraulic oil inside the elevator buffer will flow out along the air holes, resulting in oil leakage. Utility Model Content

[0003] The purpose of the present application is to solve the above problems and provide an elevator buffer, comprising: a plunger barrel, wherein the plunger barrel has a receiving space for containing hydraulic oil, and further comprising:

[0004] An end cap provided at one end of the plunger barrel is provided with an annular groove in the circumferential direction of the inner wall of the plunger barrel;

[0005] A buffer, wherein the buffer has a switching portion and a clamping portion arranged along a first direction, and when the buffer enters into the end cover and the plunger barrel along the first direction, the clamping portion abuts against the inner wall of the annular groove;

[0006] The buffer has a first state and a second state. When in the first state, the accommodating space is in a closed state. When in the second state, the accommodating space is connected to the outside. The switching part is used to switch the buffer between the first state and the second state.

[0007] According to the technical solution provided in the embodiment of the present application, the number of the clamping parts is at least one, and each of the clamping parts includes a first annular part, a second annular part and a third annular part arranged along the first direction, and the first annular part, the second annular part and the third annular part together form a boss shape; the number of the annular grooves corresponds to the number of the clamping parts, and the annular grooves are in a circular ring shape, one end of the first annular part abuts against the edge of the annular groove relatively close to the end cover, the second annular part abuts against the inner wall of the annular groove, and the third annular part abuts against the edge of the annular groove relatively far from the end cover; the cross-sectional shape of the clamping part and the annular groove is circular or polygonal.

[0008] According to the technical solution provided in the embodiment of the present application, the switching portion includes a clamping portion and a positioning portion arranged along the first direction, the diameter of the positioning portion is smaller than the clamping portion and the clamping portion, and when the buffer member enters the end cover along the first direction, the clamping portion abuts against a side of the end cover away from the annular groove, and the positioning portion abuts against the inner wall of the end cover.

[0009] According to the technical solution provided in the embodiment of the present application, the end cover is in a circular shape, and the inner edge of the end cover is aligned with the inner edge of the plunger barrel, and the outer wall of the positioning portion abuts against the end cover and the inner wall of the plunger barrel; or, the end cover includes a limiting portion provided between the clamping portion and the upper edge of the plunger barrel, and a sealing portion perpendicular to the limiting portion, and the sealing portion is used to abut against the inner wall of the plunger barrel and the positioning portion.

[0010] According to the technical solution provided in the embodiment of the present application, at least one hole to be punched is provided on the clamping portion, and the hole to be punched is formed of a flexible material and is in a normally closed state, which can be opened under the action of an external force to enable the buffer to switch between the first state and the second state.

[0011] According to the technical solution provided in the embodiment of the present application, at least one air hole is provided on the pressing portion, and also includes a sealing member used in conjunction with the air hole, and the cross-sectional shape of the air hole is circular or polygonal.

[0012] According to the technical solution provided in the embodiment of the present application, the positioning portion is an annular structure, the air hole is a through hole that penetrates the clamping portion, and the blocking member is a plug that matches the through hole.

[0013] According to the technical solution provided in the embodiment of the present application, the positioning portion is a columnar structure, and a first channel extending along the first direction and extending into the positioning portion is opened on the clamping portion. A second channel is provided in the positioning portion, and the second channel is located below and connected to the first channel, and the diameter of the second channel is smaller than the diameter of the first channel. The second channel and the first channel together form the air hole, and the elevator buffer also includes a sealing member used in conjunction with the switching portion.

[0014] According to the technical solution provided in the embodiment of the present application, the blocking member includes a first section and a second section arranged along the first direction, the first section is inserted into the first channel, and the second section is inserted into the second channel.

[0015] According to the technical solution provided in the embodiment of the present application, the sealing member includes a third division and a fourth division connected along the first direction, the third division is integrally formed with the upper edge of the air hole, and the fourth division can separate the sealing member from the clamping portion under the action of external force.

[0016] Compared with the prior art, the beneficial effects of the present application are as follows: the present application provides an elevator buffer, comprising a plunger barrel, a storage space for containing hydraulic oil is formed therein, an end cover arranged on one side thereof, an annular groove is arranged circumferentially on the inner wall of the plunger barrel, and a buffer member used in conjunction with the plunger barrel, comprising a switching portion and a clamping portion, the clamping portion abuts against the inner wall of the annular groove, the buffer member has a first state and a second state, when in the first state, the storage space is in a closed state, when in the second state, the storage space is connected to the outside, the switching portion is used to switch the buffer member between the first state and the second state, the buffer member is inserted into the plunger barrel until the clamping portion abuts against the annular groove inside the plunger barrel Then, the buffer is switched to the first state through the switching part. The buffer in the first state can prevent the hydraulic oil inside the elevator buffer from flowing out during transportation. After the elevator buffer is installed, the switching part is used to switch the buffer to the second state. The accommodating space is connected to the outside through the buffer in the second state. At this time, it can be ensured that the elevator buffer can be exhausted when it is hit and the buffer can be reset to take in air; through the structure described in the present application, it can be ensured that the elevator buffer filled with hydraulic oil will not leak out during transportation, and the hydraulic oil does not need to be transported separately, which saves the transportation cost to a great extent and avoids the danger during transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a structure in which a buffer member provided in an embodiment of the present application is provided with holes to be punched;

[0018] Figure 2A cross-sectional view of a buffer provided in an embodiment of the present application with holes to be punched;

[0019] Figure 3 An overall view of a buffer provided in an embodiment of the present application with air holes;

[0020] Figure 4 A cross-sectional view of a buffer provided in an embodiment of the present application with air holes;

[0021] Figure 5 A view of the plunger barrel and the buffer member provided in the embodiment of the present application being matched together;

[0022] Figure 6 A schematic diagram of the blocking member provided in an embodiment of the present application used in conjunction with the first channel;

[0023] Figure 7 A schematic diagram of the blocking member, the first channel and the plunger barrel provided in an embodiment of the present application in cooperation with each other;

[0024] Figure 8 A schematic diagram of an integrally formed blocking member and a buffer member provided in an embodiment of the present application;

[0025] Fig. 9 A schematic diagram of an end cap provided in an embodiment of the present application in a circular ring shape;

[0026] Fig.10 A schematic diagram of the integrally formed connection portion and the buffer member provided in an embodiment of the present application.

[0027] The text markings in the figure are as follows: 1. plunger barrel; 2. end cover; 3. annular groove; 4. pressing portion; 5. clamping portion; 6. hole to be punched; 7. positioning portion; 8. air hole; 9. blocking piece; 10. first annular portion; 11. second annular portion; 12. third annular portion; 14. first division; 15. second division; 17. first channel; 18. second channel; 19. third division; 20. fourth division; 21. limiting portion; 22. sealing portion. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is described in detail below in conjunction with the accompanying drawings. The description in this section is only exemplary and explanatory and should not have any limiting effect on the scope of protection of the present application.

[0029] The present application provides an elevator buffer in view of the above problems, including a plunger barrel 1, wherein the plunger barrel 1 has a receiving space for containing hydraulic oil, and further includes:

[0030] An end cover 2 is provided at one end of the plunger barrel 1, and an annular groove 3 is provided on the circumference of the inner wall of the plunger barrel 1;

[0031] A buffer, wherein the buffer has a switching portion and a clamping portion 5 arranged along a first direction, and when the buffer enters into the end cover 2 and the plunger barrel 1 along the first direction, the clamping portion 5 abuts against the inner wall of the annular groove 3;

[0032] The buffer has a first state and a second state. When in the first state, the accommodating space is in a closed state. When in the second state, the accommodating space is connected to the outside. The switching part is used to switch the buffer between the first state and the second state.

[0033] Specifically, in this embodiment, Figure 1 , Figure 2 and Figure 5 As shown, an elevator buffer provided by the present application includes a plunger barrel 1, the interior of the plunger barrel 1 has a storage space for containing hydraulic oil, the elevator buffer also includes an end cover 2 arranged at one end of the plunger barrel 1, a circle of annular grooves 3 are circumferentially provided on the inner wall of the plunger barrel 1, and a buffer member, the buffer member has a switching portion and a clamping portion 5 arranged along a first direction, when the buffer member enters the interior of the end cover 2 and the plunger barrel 1 along the first direction, the clamping portion 5 abuts against the inner wall of the annular groove 3, the buffer member has a first state and a second state, when the buffer member is in the first state, the storage space is in a closed state, when the buffer member is in the second state, the storage space is connected to the outside, and the switching portion is used to switch the buffer member between the first state and the second state.

[0034] During use, the buffer is inserted into the plunger barrel until the clamping portion abuts against the annular groove inside the plunger barrel, and the buffer is switched to the first state through the switching portion. The buffer in the first state can prevent the hydraulic oil inside the elevator buffer from flowing out during transportation. After the elevator buffer is installed, the switching portion is used to switch the buffer to the second state. The accommodating space is connected to the outside world through the buffer in the second state. At this time, it can be ensured that the elevator buffer can be exhausted when it is hit and that air can be taken in when the buffer is reset.

[0035] Furthermore, the number of the clamping parts 5 is at least one, and each of the clamping parts 5 includes a first annular part 10, a second annular part 11 and a third annular part 12 arranged along the first direction, and the first annular part 10, the second annular part 11 and the third annular part 12 together form a boss shape; the number of the annular grooves 3 corresponds to the number of the clamping parts 5, and the annular grooves 3 are in a circular ring shape, one end of the first annular part 10 abuts against the edge of the annular groove 3 relatively close to the end cover 2, the second annular part 11 abuts against the inner wall of the annular groove 3, and the third annular part 12 abuts against the edge of the annular groove 3 relatively far from the end cover 2; the cross-sectional shape of the clamping part 5 and the annular groove 3 is circular or polygonal.

[0036] Specifically, in this embodiment, Figure 4 As shown, the number of the clamping parts 5 can be one or more. In the present embodiment, the number of the clamping parts 5 is one, but the number of the clamping parts 5 is not limited. The clamping part 5 includes a first annular part 10, a second annular part 11 and a third annular part 12 arranged along the first direction, and the three together form the clamping part 5 in the shape of a boss. The number of the annular grooves 3 corresponds to the number of the clamping parts 5. The cross-sectional shape of the clamping part 5 and the annular groove 3 is circular or polygonal; the annular groove 3 is in a circular ring shape, and the end of the first annular part 10 away from the second annular part 11 abuts against the outer edge of one end of the annular groove 3, and the end of the third annular part 12 away from the second annular part 11 abuts against the outer edge of the other end of the annular groove 3, thereby enhancing the stability between the buffer and the end cover 2 and avoiding the phenomenon that the hydraulic oil flows out of the accommodation space during transportation.

[0037] Furthermore, the switching portion includes a clamping portion 4 and a positioning portion 7 arranged along the first direction, and the diameter of the positioning portion 7 is smaller than the clamping portion 4 and the clamping portion 5. When the buffer member enters the end cover 2 along the first direction, the clamping portion 4 abuts against a side of the end cover 2 away from the annular groove 3, and the positioning portion 7 abuts against an inner wall of the end cover 2.

[0038] Specifically, in this embodiment, Figure 4As shown, the switching portion includes a clamping portion 4 and a positioning portion 7 arranged along the first direction, the clamping portion 4 is circular, and the clamping portion 5 is hollow inside. When the buffer member enters into the end cover 2 along the first direction, the clamping portion 4 abuts against the upper surface of the end cover 2, and the clamping portion 5 enters into the end cover 2 and the plunger barrel 1, and abuts against the inner wall of the annular groove 3 in the plunger barrel 1. Because the buffer member and the plunger barrel 1 are in a clamping relationship, the stability of the connection between the buffer member and the plunger barrel 1 can be ensured.

[0039] Furthermore, the end cover 2 is in a circular shape, and the inner edge of the end cover 2 is aligned with the inner edge of the plunger barrel 1, and the outer wall of the positioning portion 7 abuts against the inner walls of the end cover 2 and the plunger barrel 1; or, the end cover 2 includes a limiting portion 21 provided between the clamping portion 4 and the upper edge of the plunger barrel 1, and a sealing portion 22 perpendicular to the limiting portion 21, and the sealing portion 22 is used to abut against the inner wall of the plunger barrel 1 and the positioning portion 7.

[0040] Specifically, in this embodiment, Fig. 9 and Fig.10 As shown, the end cover 2 is in a circular shape, and the inner edge of the end cover 2 is aligned with the inner edge of the plunger barrel 1, and the outer wall of the positioning portion 7 abuts against the inner walls of the end cover 2 and the plunger barrel 1;

[0041] Or, if Figure 7 As shown, the end cover 2 includes a limiting portion 21 arranged between the clamping portion 4 and the upper edge of the plunger barrel 1, and a sealing portion 22 perpendicular to the limiting portion 21, and the sealing portion 22 is used to abut against the inner wall of the plunger barrel 1 and the positioning portion 7.

[0042] Furthermore, at least one hole 6 to be punched is provided on the pressing portion 4. The hole 6 to be punched is formed of a flexible material and is in a normally closed state. It can be opened under the action of an external force so that the buffer component can switch between the first state and the second state.

[0043] Specifically, in this embodiment, Figure 1 and Figure 2 As shown, holes 6 to be punched are provided on the pressing portion 4, and the number of the holes 6 to be punched can be one or more. The holes 6 to be punched are formed of flexible material and are in a normally closed state, which can ensure that the hydraulic oil contained in the elevator buffer will not flow out even if the elevator buffer falls during transportation. After the elevator buffer is installed, the holes 6 to be punched can be opened by external force, so that the accommodating space is connected with the outside world through the holes 6 to be punched.

[0044] Furthermore, at least one air hole 8 is provided on the pressing portion 4 , and a blocking member 9 used in conjunction with the air hole 8 is also provided. The cross-sectional shape of the air hole 8 is circular or polygonal.

[0045] Specifically, in this embodiment, Figure 3 and Figure 5 As shown, an air hole 8 extending along the first direction is opened on the buffer, the number of the air hole 8 can be one or more, the cross-sectional shape of the air hole 8 is circular or polygonal, and the air hole 8 is connected with the accommodating space, so that the elevator buffer can be exhausted when it is hit and the buffer can be reset to take in air. The elevator buffer also includes a blocking member 9 used in conjunction with the air hole 8, and the blocking member 9 is used to block the air hole 8 so that the accommodating space is in a closed state. During transportation, after the hydraulic oil is injected into the plunger barrel 1, the air hole 8 is blocked by the blocking member 9, which can avoid the hydraulic oil from flowing out during transportation. After the elevator buffer is installed, the blocking member 9 can be separated from the air hole 8, and the accommodating space is connected to the outside through the air hole 8.

[0046] Furthermore, the positioning portion 7 is an annular structure, the air hole 8 is a through hole penetrating the pressing portion 4, and the blocking member 9 is a plug matched with the through hole.

[0047] Specifically, in this embodiment, the positioning portion 7 is a ring-shaped structure, and the air hole 8 is as follows: Figure 5 As shown in the through hole that passes through the pressing portion 4, in this case, the shape of the plug is adapted to the shape of the pore 8; Figure 6 As shown, the air hole 8 includes a first channel 17 and a second channel 18 arranged along the first direction. In this case, the blocking member 9 includes a first section 14 and a second section 15 arranged along the first direction, which will be further introduced in subsequent embodiments.

[0048] Furthermore, a first channel 17 extending along the first direction and extending into the positioning portion 7 is opened on the clamping portion 4, a second channel 18 is provided in the positioning portion 7, the second channel 18 is located below and connected to the first channel 17, and the diameter of the second channel 18 is smaller than the diameter of the first channel 17, the second channel 18 and the first channel 17 together form the air hole 8, and the elevator buffer also includes a blocking member 9 used in conjunction with the switching portion.

[0049] Specifically, in this embodiment, Figure 6As shown, the positioning portion 7 is a columnar structure, and a first channel 17 extending along the first direction is opened on the clamping portion 4, and the first channel 17 extends into the positioning portion 7. A second channel 18 is also provided in the positioning portion 7, and the first channel 17 and the second channel 18 are arranged along the first direction, and the second channel 18 is below the first channel 17, and the second channel 18 is connected to the first channel 17, and the diameter of the second channel 18 is smaller than the diameter of the first channel 17. It also includes a blocking member 9 used in conjunction with the switching portion, and the blocking member 9 is used to block the first channel 17 and the second channel 18, so as to prevent the hydraulic oil in the accommodating space from flowing out during transportation, and after the elevator buffer is installed, the blocking member 9 is directly taken out from the first channel 17 and the second channel 18, and the accommodating space is connected to the outside.

[0050] Furthermore, the blocking member 9 includes a first section 14 and a second section 15 arranged along the first direction, the first section 14 is inserted into the first hole 17 , and the second section 15 is inserted into the second hole 18 .

[0051] Specifically, in this embodiment, Figure 6 As shown, the blocking member 9 includes a first section 14 and a second section 15 arranged along the first direction, the first section 14 is inserted into the first channel 17 to block the first channel 17, and the second section 15 is inserted into the second channel 18 to block the second channel 18. Figure 6 and Figure 7 , which is a schematic diagram of the blocking member 9 used in conjunction with the first hole 17 and the second hole 18 .

[0052] Furthermore, the blocking member 9 includes a third section 19 and a fourth section 20 connected along the first direction, the third section 19 is integrally formed with the upper edge of the air hole 8, and the fourth section 20 can separate the blocking member 9 from the clamping portion 4 under the action of an external force.

[0053] Specifically, in this embodiment, Figure 7 , Figure 8 As shown, the blocking member 9 includes a third division 19 and a fourth division 20 connected along the first direction, wherein the third division 19 and the upper edge of the air hole 8 are integrally formed, which can ensure that during transportation, the hydraulic oil can be prevented from flowing out, and external impurities can be prevented from entering the accommodating space. When in use, an external force can be manually applied to the fourth division 20 to separate the blocking member 9 from the clamping portion 4, so as to realize the communication between the accommodating space and the outside.

[0054] Working principle: During use, the buffer is inserted into the plunger barrel 1 until the clamping portion 5 abuts against the annular groove 3 inside the plunger barrel 1, and the buffer is switched to the first state through the switching portion. The buffer in the first state can prevent the hydraulic oil inside the elevator buffer from flowing out during transportation. After the elevator buffer is installed, the switching portion is used to switch the buffer from the first state to the second state. The accommodating space is connected to the outside world through the buffer in the second state. At this time, it can be ensured that the elevator buffer can be exhausted when it is hit and that air can be taken in when the buffer is reset.

[0055] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this utility model, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. An elevator buffer, comprising a plunger barrel (1), wherein the plunger barrel (1) has a receiving space for containing hydraulic oil, characterized in that: Also includes: An end cover (2) is provided at one end of the plunger barrel (1), and an annular groove (3) is provided in the circumferential direction of the inner wall of the plunger barrel (1); A buffer member, the buffer member having a switching portion and a clamping portion (5) arranged along a first direction, and when the buffer member enters into the end cover (2) and the plunger barrel (1) along the first direction, the clamping portion (5) abuts against an inner wall of the annular groove (3); The buffer has a first state and a second state. When in the first state, the accommodating space is in a closed state. When in the second state, the accommodating space is connected to the outside. The switching part is used to switch the buffer between the first state and the second state.

2. The elevator buffer according to claim 1, characterized in that: The number of the clamping parts (5) is at least one, and each of the clamping parts (5) comprises a first annular part (10), a second annular part (11) and a third annular part (12) arranged along the first direction, and the first annular part (10), the second annular part (11) and the third annular part (12) together form a boss shape; the number of the annular grooves (3) corresponds to the number of the clamping parts (5), and the annular grooves (3) are in the shape of a circular ring, one end of the first annular part (10) abuts against an edge of the annular groove (3) relatively close to the end cover (2), the second annular part (11) abuts against an inner wall of the annular groove (3), and the third annular part (12) abuts against an edge of the annular groove (3) relatively far from the end cover (2); the cross-sectional shape of the clamping part (5) and the annular groove (3) is circular or polygonal.

3. The elevator buffer according to claim 1, characterized in that: The switching portion comprises a pressing portion (4) and a positioning portion (7) arranged along the first direction, the positioning portion (7) having a smaller diameter than the pressing portion (4) and the clamping portion (5), and when the buffer member enters the end cover (2) along the first direction, the pressing portion (4) abuts against a surface of the end cover (2) away from the annular groove (3), and the positioning portion (7) abuts against an inner wall of the end cover (2).

4. The elevator buffer according to claim 3, characterized in that: The end cover (2) is annular, and the inner edge of the end cover (2) is aligned with the inner edge of the plunger barrel (1), and the outer wall of the positioning portion (7) abuts against the inner walls of the end cover (2) and the plunger barrel (1); or, the end cover (2) includes a limiting portion (21) provided between the pressing portion (4) and the upper edge of the plunger barrel (1), and a sealing portion (22) perpendicular to the limiting portion (21), and the sealing portion (22) is used to abut against the inner wall of the plunger barrel (1) and the positioning portion (7).

5. The elevator buffer according to claim 3, characterized in that: At least one hole (6) to be punched is provided on the pressing portion (4); the hole (6) to be punched is formed of a flexible material and is in a normally closed state, and can be opened under the action of an external force, so that the buffer component switches between the first state and the second state.

6. The elevator buffer according to claim 3, characterized in that: At least one air hole (8) is provided on the pressing portion (4), and also includes a blocking member (9) used in conjunction with the air hole (8); the cross-sectional shape of the air hole (8) is circular or polygonal.

7. The elevator buffer according to claim 6, characterized in that: The positioning portion (7) is an annular structure, the air hole (8) is a through hole that penetrates the pressing portion (4), and the blocking member (9) is a plug that matches the through hole.

8. The elevator buffer according to claim 6, characterized in that: The positioning portion (7) is a columnar structure. A first channel (17) extending along the first direction and extending into the positioning portion (7) is provided on the pressing portion (4). A second channel (18) is provided in the positioning portion (7). The second channel (18) is located below and connected to the first channel (17). The diameter of the second channel (18) is smaller than the diameter of the first channel (17). The second channel (18) and the first channel (17) together form the air hole (8).

9. The elevator buffer according to claim 8, characterized in that: The blocking member (9) comprises a first section (14) and a second section (15) arranged along the first direction, the first section (14) being inserted into the first hole (17), and the second section (15) being inserted into the second hole (18).

10. The elevator buffer according to claim 6, characterized in that: The blocking member (9) comprises a third section (19) and a fourth section (20) connected along the first direction, the third section (19) and the upper edge of the air hole (8) are integrally formed, and the fourth section (20) can separate the blocking member (9) from the pressing portion (4) under the action of an external force.

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