Pressure relief device of blasting equipment for mountain mining

Abstract

The utility model relates to the technical field of pressure relief, and discloses a pressure relief device of blasting equipment for mountain mining, which comprises a mounting pipe, a first reducer pipe is arranged at the top of the mounting pipe, a first pressure relief pipe is arranged at the top of the first reducer pipe, and a second reducer pipe is arranged at the top of the first pressure relief pipe; and a second pressure relief pipe is arranged at the top of the second reducer pipe. According to the pressure relief device of the blasting equipment for mountain mining, the diameter of a pipeline through which pressure passes can be gradually increased through the arrangement of the first reducer pipe and the second reducer pipe, the impact force generated by the pressure in the pipeline is effectively reduced, and the pressure relief efficiency can be improved through the cooperation of the first pressure relief pipe and the second pressure relief pipe with the first connecting pipe and the second connecting pipe; the effects that the high impact force generated in the blasting operation can be effectively dealt with, the phenomenon that damage is prone to being generated due to long-term high-pressure impact is avoided, impact can be effectively relieved, the service life of the pressure relief device is prolonged, the pressure relief efficiency is high, and the pressure relief device can be suitable for different pressure environments are achieved.

Description

Technical Field

[0001] The present application relates to the field of pressure relief technology, and in particular to a pressure relief device for blasting equipment used in mountain excavation. Background Art

[0002] Blasting is a common and critical step in mountain mining, effectively breaking rock and facilitating subsequent excavation and extraction. However, the enormous energy and impact forces generated during blasting can not only damage the surrounding environment but also pose a serious threat to the safety of operators and equipment. Therefore, the design and use of efficient pressure relief devices have become a crucial technical means to ensure safe mountain mining.

[0003] Currently, traditional pressure relief devices are unable to effectively cope with the high impact forces generated during blasting operations. They are easily damaged by pressure shocks during long-term use, cannot effectively alleviate the shocks, have low pressure relief efficiency, and cannot effectively adapt to different pressures. Utility Model Content

[0004] In response to the shortcomings of the existing technology, the present application provides a pressure relief device for blasting equipment used in mountain excavation, which can effectively cope with the high impact force generated in blasting operations, avoid the phenomenon of damage easily caused by long-term high-pressure shock, effectively alleviate the impact, and increase the service life of the pressure relief device. It has high pressure relief efficiency and can be applied to different pressure environments. It solves the problems that the current traditional pressure relief devices cannot effectively cope with the high impact force generated in blasting operations, are easily damaged by pressure shocks during long-term use, cannot effectively alleviate the impact, have low pressure relief efficiency, and cannot effectively adapt to different pressures.

[0005] In order to achieve the above-mentioned purpose of effectively responding to the high impact force generated in blasting operations, avoiding the phenomenon of easy damage caused by long-term high-pressure shock, effectively alleviating the impact, improving the service life of the pressure relief device, having high pressure relief efficiency, and being applicable to different pressure environments, the present application provides the following technical solutions: A pressure relief device for blasting equipment used in mountain excavation, comprising a mounting pipe, a first reducer is provided on the top of the mounting pipe, a first pressure relief pipe is provided on the top of the first reducer, a second reducer is provided on the top of the first pressure relief pipe, and a second pressure relief pipe is provided on the top of the second reducer.

[0006] A first pressure relief plate is slidingly provided on the inner wall in the middle of the first pressure relief pipe, a first connecting pipe is provided on one side of the outer surface in the middle of the first pressure relief pipe, one end of the first connecting pipe is provided on one end of the pressure relief pipe, a second connecting pipe is provided on one side of the outer edge surface in the middle of the pressure relief pipe, one end of the second connecting pipe is provided on one side of the outer surface in the middle of the second pressure relief pipe, a second pressure relief plate is slidingly provided on the inner wall in the middle of the second pressure relief pipe, a push rod is provided on one side of the first pressure relief plate, the outer surface of one end of the push rod is inserted into the inner wall in the middle of the sleeve, one end of the push rod is provided with a connecting rod, one end of the connecting rod is provided with a fixing block, the outer surface in the middle of the connecting rod is slidingly provided in the inner wall of one end of the sleeve, a sleeve is provided on one side of the second pressure relief plate, and a push ring is provided on the outer surface of one side in the middle of the sleeve.

[0007] Through the above scheme, the diameter of the pipeline through which the pressure passes can be gradually increased by setting the first reducer and the second reducer, effectively reducing the impact force generated by the pressure in the pipeline, and the first pressure relief pipe and the second pressure relief pipe cooperate with the first connecting pipe and the second connecting pipe to increase the efficiency of pressure relief, thereby effectively coping with the high impact force generated in the blasting operation, avoiding the phenomenon of easy damage caused by long-term high-pressure shock, effectively alleviating the impact, and improving the service life of the pressure relief device. The pressure relief efficiency is high and it can be applied to different pressure environments.

[0008] Furthermore, a check mechanism is provided on the inner wall of the middle portion of the second connecting pipe, and the valve plate of the check mechanism opens toward the end of the second connecting pipe close to the pressure relief pipe.

[0009] With the above solution, the check mechanism can prevent the pressure discharged by the first pressure relief pipe in cooperation with the first connecting pipe from entering the pressure relief pipe through the second connecting pipe, thereby avoiding damage to the device caused by pressure backflow.

[0010] Furthermore, the first reducer is funnel-shaped, and the inner wall diameter of one end of the first reducer close to the mounting tube is smaller than the inner wall diameter of one end of the first reducer close to the first pressure relief tube.

[0011] Through the above scheme, the pipe diameter at the rear end of the installation pipe can be increased by setting the first reducer, and the funnel-shaped setting of the first reducer can disperse the impact force generated by the pressure in the installation pipe, reduce the impact force of the pressure in the installation pipe after leaving the installation pipe, and reduce the damage to the first pressure relief plate caused by the impact force generated by the pressure.

[0012] Furthermore, the second reducer is funnel-shaped, and the inner wall diameter of one end of the second reducer close to the first pressure relief pipe is smaller than the inner wall diameter of one end of the second reducer close to the second pressure relief pipe.

[0013] Through the above scheme, the diameter of the pipe at the rear end of the first pressure relief pipe can be increased by setting the second reducer, and the funnel-shaped setting of the second reducer can disperse the impact force generated by the pressure in the first pressure relief pipe, reduce the impact force of the pressure in the first pressure relief pipe after leaving the first pressure relief pipe, and reduce the damage to the second pressure relief plate caused by the impact force generated by the pressure.

[0014] Furthermore, a first spring is provided at one end of the push rod, and one end of the first spring is provided at one end of the inner wall of the sleeve.

[0015] Through the above solution, the arrangement of the first spring can apply a thrust to the first pressure relief plate through the push rod, and can push the first pressure relief plate to close one end of the first pressure relief pipe.

[0016] Furthermore, a second spring is provided on the top of the push ring, one end of the second spring is provided at the bottom of the fixing ring, the middle outer surface of the fixing ring is provided in the middle inner wall of the second pressure relief pipe through a fixing rod, and the middle inner wall of the fixing ring is slidably connected to the outer surface of one side of the middle of the sleeve.

[0017] Through the above solution, the second spring can apply a thrust to the second pressure relief plate by pushing the ring and the sleeve, and can push the second pressure relief plate to close the second pressure relief plate.

[0018] Furthermore, the inner wall of one side of the fixed block is slidably connected to the outer surface of one side of the limit block, the other side of the limit block is arranged at one end of the limit rod, and two guide plates are provided on one side of the fixed block. The two guide plates on one side of the fixed block are arranged in a V shape, and the outer surface of one side of the guide plate is slidably connected to the outer surface of one side of the limit block.

[0019] Through the above scheme, the position of the fixed block can be limited by inserting the outer surface of one side of the limit block into the inner wall of one side of the fixed block, and then the position of the first pressure relief plate is fixed by the connecting rod and the push rod, and the first pressure relief plate is pulled to fit against one side of the second pressure relief plate, so that the second pressure relief plate supports the first pressure relief plate, and avoids the impact force caused by the pressure from damaging the first pressure relief plate. The setting of the guide plate can guide the movement of the limit block, so that the limit block can be accurately inserted into the inner wall of one side of the fixed block, and pull the first pressure relief plate to fit closely against one side of the second pressure relief plate.

[0020] Furthermore, a limit frame is provided on one side of the outer surface of one end of the sleeve through a fixed frame, and the middle inner wall of the limit frame is slidably connected to the middle outer surface of the limit rod. A sliding rod is provided on one end of the limit rod through a rotating connecting frame, and the middle outer surface of the sliding rod is slidably connected to the middle inner wall of the sliding frame. One side of the sliding frame is provided on one side of the middle inner wall of the sleeve through a connecting block.

[0021] Through the above scheme, the angle of the limit rod when moving can be fixed by sliding the outer surface of the middle part of the limit rod within the middle inner wall of the limit frame, thereby improving the stability of the limit rod when moving. The setting of the sliding rod enables the limit rod to move through the angle of the sliding frame when the sliding rod slides within the middle inner wall of the sliding frame.

[0022] Compared with the existing technology, the technical solution of this application has the following beneficial effects:

[0023] This pressure relief device of blasting equipment used in mountain excavation can gradually increase the diameter of the pipe through which pressure passes through by arranging the first reducer and the second reducer, effectively reducing the impact force generated by the pressure in the pipe. The first pressure relief pipe and the second pressure relief pipe cooperate with the first connecting pipe and the second connecting pipe to increase the efficiency of pressure relief, thereby effectively coping with the high impact force generated in the blasting operation, avoiding the phenomenon of easy damage caused by long-term high-pressure impact, effectively alleviating the impact, and increasing the service life of the pressure relief device. The pressure relief efficiency is high and it can be applied to different pressure environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of this application;

[0025] Figure 2 This is a schematic diagram of the front structure of this application;

[0026] Figure 3 This is a schematic diagram of the three-dimensional cross-sectional structure of this application;

[0027] Figure 4 This is a schematic diagram of the front cross-sectional structure of this application;

[0028] Figure 5 This is a schematic diagram of the front cross-sectional structure of the casing of this application;

[0029] Figure 6 This is a schematic diagram of the connection structure between the sliding rod and the sliding frame of this application.

[0030] In the picture:

[0031] 1. Mounting tube; 2. First reducer; 3. First pressure relief tube; 4. Second reducer; 5. Second pressure relief tube; 6. First pressure relief plate; 7. Push rod; 8. First spring; 9. Sleeve; 10. Second pressure relief plate; 11. Push ring; 12. Second spring; 13. Fixed ring; 14. Connecting rod; 15. Fixed block; 16. Guide plate; 17. Limit block; 18. Limit rod; 19. Slide rod; 20. Slide frame; 21. Limit frame; 22. First connecting tube; 23. Second connecting tube; 24. Pressure relief tube; 25. Check mechanism. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] See also Figure 1 、 Figure 3 and Figure 4 In this embodiment, a pressure relief device for blasting equipment used in mountain excavation includes a mounting pipe 1, a first reducer 2 is provided on the top of the mounting pipe 1, a first pressure relief pipe 3 is provided on the top of the first reducer 2, a second reducer 4 is provided on the top of the first pressure relief pipe 3, and a second pressure relief pipe 5 is provided on the top of the second reducer 4.

[0034] A first pressure relief plate 6 is slidingly provided on the inner wall in the middle of the first pressure relief pipe 3, a first connecting pipe 22 is provided on one side of the outer surface in the middle of the first pressure relief pipe 3, one end of the first connecting pipe 22 is provided on one end of the pressure relief pipe 24, a second connecting pipe 23 is provided on one side of the outer surface in the middle of the pressure relief pipe 24, one end of the second connecting pipe 23 is provided on one side of the outer surface in the middle of the second pressure relief pipe 5, a second pressure relief plate 10 is slidingly provided on the inner wall in the middle of the second pressure relief pipe 5, a push rod 7 is provided on one side of the first pressure relief plate 6, the outer surface of one end of the push rod 7 is inserted into the inner wall in the middle of the sleeve 9, a connecting rod 14 is provided at one end of the push rod 7, a fixing block 15 is provided at one end of the connecting rod 14, the outer surface in the middle of the connecting rod 14 is slidably provided in the inner wall of one end of the sleeve 9, a sleeve 9 is provided on one side of the second pressure relief plate 10, and a push ring 11 is provided on the outer surface of one side in the middle of the sleeve 9.

[0035] See also Figure 3 and Figure 4 A check mechanism 25 is provided on the inner wall in the middle of the second connecting pipe 23. The valve plate of the check mechanism 25 opens toward the end of the second connecting pipe 23 close to the pressure relief pipe 24. The setting of the check mechanism 25 can prevent the pressure discharged by the first pressure relief pipe 3 in cooperation with the first connecting pipe 22 from entering the pressure relief pipe 5 through the second connecting pipe 23, thereby avoiding damage to the device caused by pressure backflow.

[0036] See also Figure 1 、 Figure 2 and Figure 4 The first reducer 2 is funnel-shaped, and the inner wall diameter of one end of the first reducer 2 close to the mounting pipe 1 is smaller than the inner wall diameter of one end of the first reducer 2 close to the first pressure relief pipe 3. The diameter of the pipe at the rear end of the mounting pipe 1 can be increased by setting the first reducer 2. The funnel-shaped setting of the first reducer 2 can disperse the impact force generated by the pressure in the mounting pipe 1, reduce the impact force of the pressure in the mounting pipe 1 after leaving the mounting pipe 1, and reduce the damage to the first pressure relief plate 6 caused by the impact force of the pressure.

[0037] See also Figure 1 、 Figure 2 and Figure 4 The second reducer 4 is funnel-shaped, and the inner wall diameter of the end of the second reducer 4 close to the first pressure relief pipe 3 is smaller than the inner wall diameter of the end of the second reducer 4 close to the second pressure relief pipe 5. The diameter of the pipe at the rear end of the first pressure relief pipe 3 can be increased by setting the second reducer 4. The funnel-shaped setting of the second reducer 2 can disperse the impact force generated by the pressure in the first pressure relief pipe 3, reduce the impact force of the pressure in the first pressure relief pipe 3 after leaving the first pressure relief pipe 3, and reduce the damage to the second pressure relief plate 10 caused by the impact force of the pressure.

[0038] See also Figure 5 A first spring 8 is provided at one end of the push rod 7, and one end of the first spring 8 is provided at one end of the inner wall of the sleeve 9. The setting of the first spring 8 can apply a thrust to the first pressure relief plate 6 through the push rod 7, and can push the first pressure relief plate 6 to close one end of the first pressure relief pipe 3.

[0039] See also Figure 3 and Figure 4 A second spring 12 is provided on the top of the pushing ring 11, and one end of the second spring 12 is provided at the bottom of the fixing ring 13. The middle outer surface of the fixing ring 13 is provided in the middle inner wall of the second pressure relief tube 5 through a fixing rod. The middle inner wall of the fixing ring 13 is slidingly connected to the outer surface of one side of the middle of the sleeve 9. The setting of the second spring 12 can apply a thrust to the second pressure relief plate 10 through the pushing ring 11 and the sleeve 9, and can push the second pressure relief plate 10 to close the second pressure relief plate 5.

[0040] See also Figure 3 、 Figure 4 and Figure 5 The setting of the guide plate 16 can guide the movement of the limit block 17, so that the limit block 17 can be accurately inserted into the inner wall of one side of the fixed block 15, and the first pressure relief plate 6 is pulled close to one side of the second pressure relief plate 10.

[0041] See also Figure 5 and Figure 6 A limit frame 21 is provided on one side of the outer surface of one end of the sleeve 9 through a fixed frame, and the inner wall of the middle part of the limit frame 21 is slidably connected to the outer surface of the middle part of the limit rod 18. A sliding rod 19 is provided on one end of the limit rod 18 through a connecting frame. The outer surface of the middle part of the slide rod 19 is slidably connected to the inner wall of the middle part of the slide frame 20. One side of the slide frame 20 is provided on one side of the inner wall of the middle part of the sleeve 9 through a connecting block. The angle of the limit rod 18 when moving can be fixed by sliding the outer surface of the middle part of the limit rod 18 in the inner wall of the middle part of the limit frame 21, thereby improving the stability of the limit rod 18 when moving. The setting of the slide rod 19 enables the limit rod 18 to be driven to move by the angle of the slide frame 20 when the slide rod 19 slides in the inner wall of the middle part of the slide frame 20.

[0042] In this embodiment, a pressure relief device of blasting equipment is used for mountain excavation. The diameter of the pipe through which the pressure passes can be gradually increased by setting the first reducer 4 and the second reducer 5, effectively reducing the impact force generated by the pressure in the pipe. The first pressure relief pipe 3 and the second pressure relief pipe 5 cooperate with the first connecting pipe 22 and the second connecting pipe 23 to increase the efficiency of pressure relief, thereby effectively coping with the high impact force generated in the blasting operation, avoiding the phenomenon of easy damage caused by long-term high-pressure shock, effectively alleviating the impact, and improving the service life of the pressure relief device. The pressure relief efficiency is high and it can be applied to different pressure environments.

[0043] The working principle of the above embodiment is as follows: the installation pipe 1 is installed on the pressure pipe of the equipment. When the pressure in the pressure pipe of the equipment increases, the pressure will enter the first reducer 2 through the installation pipe 1. The impact force brought by the pressure is dispersed and reduced by the funnel-shaped setting of the first reducer 2. The pressure will push the first pressure relief plate 6 to move toward the second pressure relief plate 10. The first pressure relief plate 6 pushes the push rod 7 to insert into the sleeve 9, compressing the first spring 8. The first pressure relief plate 6 slides in the first pressure relief pipe 3. When the first pressure relief plate 6 When the plate 6 slides through the first connecting pipe 22 in the first pressure relief pipe 3, the pressure in the first pressure relief pipe 3 will enter the pressure relief pipe 24 through the first connecting pipe 22 for discharge. When the pressure is too large, it will continue to push the first pressure relief plate 6 to move, so that the first pressure relief plate 6 is attached to one side of the second pressure relief pipe 10. At the same time, the push rod 7 will push the connecting rod 14 to move, and the connecting pipe 14 will drive the fixed block 15 to move in the second pressure relief pipe 5. The pressure will enter the second reducer 4 through the first pressure relief pipe 3 and pass through the funnel-shaped second reducer 4. The impact force caused by the pressure is dispersed and reduced again. The pressure will push the first pressure relief plate 6 and the second pressure relief plate 10 to move, so that the second pressure relief plate 10 slides in the second pressure relief tube 5. The second pressure relief plate 10 will drive the sleeve 9 to move. The outer surface of one side of the middle part of the sleeve 9 will slide in the inner wall of the middle part of the fixing ring 13. When the sleeve 9 moves, the second spring 12 is compressed by the pushing ring 11. When the sleeve 9 moves, it will drive the slide rod 19 to slide in the inner wall of the middle part of the slide frame 20. The slide rod 19 will move laterally through the slide frame 20. The limiting block 17 is driven by the limiting rod 18 to be inserted into the inner wall of one side of the fixed block 15, and the limiting block 15 is fixed to fix the position of the first pressure relief plate 6, so that the first pressure relief plate 6 is tightly attached to one side of the second pressure relief plate 10. When the second pressure relief plate 10 slides over the second connecting pipe 23 in the second pressure relief pipe 5, the pressure in the second reducer 4 will enter the second connecting pipe 23 through the second pressure relief pipe 5. The pressure will open the check mechanism 25, so that the pressure in the second connecting pipe 23 enters the pressure relief pipe 24 for discharge.

[0044] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0045] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A pressure relief device for blasting equipment used in mountain excavation, comprising a mounting pipe (1), characterized in that: A first reducer (2) is provided on the top of the installation tube (1), a first pressure relief tube (3) is provided on the top of the first reducer (2), a second reducer (4) is provided on the top of the first pressure relief tube (3), and a second pressure relief tube (5) is provided on the top of the second reducer (4); A first pressure relief plate (6) is slidably provided on the inner wall of the middle portion of the first pressure relief pipe (3), a first connecting pipe (22) is provided on one side of the outer surface of the middle portion of the first pressure relief pipe (3), one end of the first connecting pipe (22) is provided on one end of the pressure relief pipe (24), a second connecting pipe (23) is provided on one side of the outer edge of the middle portion of the pressure relief pipe (24), one end of the second connecting pipe (23) is provided on one side of the outer surface of the middle portion of the second pressure relief pipe (5), and a second pressure relief plate is slidably provided on the inner wall of the middle portion of the second pressure relief pipe (5). (10), a push rod (7) is provided on one side of the first pressure relief plate (6), the outer surface of one end of the push rod (7) is inserted into the inner wall of the middle part of the sleeve (9), a connecting rod (14) is provided on one end of the push rod (7), a fixing block (15) is provided on one end of the connecting rod (14), the outer surface of the middle part of the connecting rod (14) is slidably provided in the inner wall of one end of the sleeve (9), a sleeve (9) is provided on one side of the second pressure relief plate (10), and a push ring (11) is provided on the outer surface of one side of the middle part of the sleeve (9).

2. The pressure relief device for blasting equipment used in mountain excavation according to claim 1, characterized in that: A check mechanism (25) is provided on the inner wall of the middle portion of the second connecting pipe (23), and the valve plate of the check mechanism (25) opens toward an end of the second connecting pipe (23) close to the pressure relief pipe (24).

3. The pressure relief device for blasting equipment used in mountain excavation according to claim 1, characterized in that: The first reducer (2) is funnel-shaped, and the inner wall diameter of one end of the first reducer (2) close to the mounting tube (1) is smaller than the inner wall diameter of one end of the first reducer (2) close to the first pressure relief tube (3).

4. The pressure relief device for blasting equipment used in mountain excavation according to claim 1, characterized in that: The second reducer (4) is funnel-shaped, and the inner wall diameter of one end of the second reducer (4) close to the first pressure relief pipe (3) is smaller than the inner wall diameter of one end of the second reducer (4) close to the second pressure relief pipe (5).

5. The pressure relief device for blasting equipment used in mountain excavation according to claim 1, characterized in that: A first spring (8) is provided at one end of the push rod (7), and one end of the first spring (8) is provided at one end of the inner wall of the sleeve (9).

6. The pressure relief device for blasting equipment used in mountain excavation according to claim 1, characterized in that: A second spring (12) is provided on the top of the pushing ring (11), one end of the second spring (12) is provided at the bottom of the fixing ring (13), the middle outer surface of the fixing ring (13) is provided in the middle inner wall of the second pressure relief pipe (5) through a fixing rod, and the middle inner wall of the fixing ring (13) is slidably connected to the outer surface of one side of the middle of the sleeve (9).

7. The pressure relief device for blasting equipment used in mountain excavation according to claim 1, characterized in that: The inner wall of one side of the fixed block (15) is slidably connected to the outer surface of one side of the limit block (17), and the other side of the limit block (17) is arranged at one end of the limit rod (18). Two guide plates (16) are provided on one side of the fixed block (15), and the two guide plates (16) on one side of the fixed block (15) are arranged in a V shape. The outer surface of one side of the guide plate (16) is slidably connected to the outer surface of one side of the limit block (17).

8. The pressure relief device for blasting equipment used in mountain excavation according to claim 1, characterized in that: A limit frame (21) is provided on one side of the outer surface of one end of the sleeve (9) through a fixing frame, and the inner wall of the middle portion of the limit frame (21) is slidably connected to the outer surface of the middle portion of the limit rod (18). A slide rod (19) is provided on one end of the limit rod (18) through a connecting frame, and the outer surface of the middle portion of the slide rod (19) is slidably connected to the inner wall of the middle portion of the slide frame (20). One side of the slide frame (20) is provided on one side of the inner wall of the middle portion of the sleeve (9) through a connecting block.

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