Multi-section type lifting air bag

Abstract

The utility model provides a multi-section type lifting air bag which comprises a base and a plurality of split bodies arranged above the base in an overlapped mode. Inserting parts are arranged between the base and the adjacent split bodies and between every two adjacent split bodies. The inserting parts are annularly arranged at the positions, close to the edges, of the split bodies. A cavity is formed in each split body, an inflation inlet is formed in the base, and when the base and the split bodies are filled with gas, the outer contours of the split bodies have the taper gradually decreased from bottom to top. The split bodies form a tower-shaped structure which is gradually reduced from bottom to top, and the opening pressure of the split body located on the upper portion is larger than that of the split body adjacent to the lower end of the split body. When the bunker door of the coal bunker is closed, the multi-section type lifting air bag is exploded to dredge the blocking position, so that manual safety accidents are avoided, and the effect of dredging the blocking position of the coal bunker is achieved. The stability of the whole air bag is improved, and a guarantee is provided for lifting of the air bag.

Description

Technical Field

[0001] The utility model relates to the technical field of coal bunker dredging equipment, in particular to a multi-section lifting airbag. Background Art

[0002] In coal production, coal bunkers are required for buffer storage. Phenomena such as coal body arching, sticking to the wall, and caking are likely to occur in underground coal bunkers, resulting in the inability of the coal body in the underground coal bunker to slide naturally under the action of gravity, leading to the interruption of coal discharging, and easily causing arching and bridging blockage in the "dead zone" at the bottom of the underground coal bunker, affecting the normal production of the underground coal bunker. In severe cases of blockage, it will even cause the interruption of the entire underground mining process flow and even the suspension of coal mine production.

[0003] When the moisture content in the bunker reaches a certain level, the fluidity of the raw coal in the bunker will increase accordingly. When using the traditional manual nearby operation method to clean the coal bunker blockage or hanging wall and pengcang, it is difficult to control the gate of the coal chute, and it is extremely easy to cause a coal bunker burst accident, endangering the lives of personnel.

[0004] In the prior art, for the blockage in the coal bunker, a method such as a drill, a drill pipe, and a spiral blade is adopted. By driving the drill pipe to rotate, the spiral blade rotates and moves up and down at the same time. The setting of this method is very difficult to apply to the already built coal bunker. Due to the principle that the coal bunker cannot be emptied, it is extremely difficult to install the drill, the drill pipe, and the spiral blade in the coal bunker. Therefore, for the built underground coal bunker, manual cleaning is still required to remove the blockage, and there are still huge safety hazards. Content of the Utility Model

[0005] In view of this, the utility model aims to propose a multi-section lifting airbag, which can smoothly lift the explosive to the coal bunker blocking position by inflating the airbag, and perform blasting after closing the bunker door to dredge the coal blockage and avoid safety accidents caused by manual operation.

[0006] To achieve the above object, the technical solution of the utility model is realized as follows:

[0007] A multi-section lifting airbag includes a base and a number of segments stacked above the base;

[0008] Plug-in parts are provided between the base and its adjacent segment and between two adjacent segments;

[0009] The plug-in parts are arranged in a ring at a position close to the edge of the segment;

[0010] Each segment has a cavity inside, and an inflation port is provided on the base. When the base and the segments are filled with gas, the outer contour of the segment has a taper that gradually decreases from bottom to top;

[0011] A plurality of the split bodies form a tower-shaped structure that gradually decreases from bottom to top, and the opening pressure of the split body located in the upper part is greater than the opening pressure of the split body adjacent to its lower end.

[0012] Furthermore, an air pressure adjusting part is provided between the base and the split bodies, and between each of the split bodies;

[0013] The lower end of the split body is provided with a first hose connected to the split body adjacent to its lower part or the base;

[0014] The upper end of the split body is provided with a second hose connected to the split body adjacent to its upper part;

[0015] The air pressure adjusting part is arranged between the first hose and the second hose.

[0016] Furthermore, the air pressure adjusting part includes a sleeve sleeved outside the first hose and the second hose, a sliding part sliding along the axial direction of the sleeve, and a fixing part fixed inside the sleeve;

[0017] The inner cavity of the sleeve is also provided with a fixing plate arranged along its radial direction. The fixing plate abuts against the first hose, and an air vent is provided on the fixing plate. The inflation air flow enters the inner cavity of the sleeve through the air vent and pushes the sliding part to slide;

[0018] The fixing part is provided with a first air vent, and the air in the inner cavity of the sleeve enters the cavity of the split body above through the first air vent.

[0019] Furthermore, the sliding part includes a main body and a connecting ring arranged on the main body. The outer wall of the connecting ring abuts against the inner wall of the sleeve;

[0020] An elastic part is provided between the connecting ring and the fixing part, and a through second air vent is provided on the connecting ring;

[0021] When the air pressure in the first hose is greater than the deformation pressure of the elastic part, the main body moves away from the air vent, so that air enters the inner cavity of the sleeve from the first hose and flows through the second air vent and the first air vent into the second hose;

[0022] The deformation pressure of the elastic part gradually decreases from the split body at the upper end to the split body at the lower end layer by layer.

[0023] Furthermore, a first transition cavity is formed between the connecting ring and the fixing plate, and a second transition cavity is formed between the connecting ring and the fixing part;

[0024] The elastic part is arranged in the second transition cavity, and a sealing ring is provided between the connecting ring and the sleeve.

[0025] Further, the connecting ring is threadedly connected to the main body.

[0026] Further, the insertion part includes a convex ring provided on the bottom surface of the upper split body and a socket part provided on the top surface of the lower split body;

[0027] The convex ring extends towards the socket part, and a groove for accommodating the convex ring is formed in the socket part.

[0028] Further, the convex ring includes a vertical section and a socket section;

[0029] The groove is provided with a vertical groove covering the outside of the vertical section and a socket slot adapted to the socket section. Both the socket section and the socket slot are inverted triangular structures.

[0030] Further, both the convex ring and the groove are made of elastic materials.

[0031] Further, the height H1 of the lower split body is greater than the height H2 of its adjacent upper split body;

[0032] The numerical difference range between H1 and H2 is between 30 mm and 50 mm.

[0033] Compared with the prior art, the present utility model has the following advantages:

[0034] For the multi-section lifting airbag of the present utility model, by arranging split bodies stacked on top of the base and connecting the base to the split bodies and two adjacent split bodies through the insertion part, and connecting the inflation port provided on the base to an external gas source trachea, gas is filled into the cavity to gradually fill the cavities in each split body layer by layer. The blasting material at the top of the airbag can be lifted to the blocked position in the coal bunker accordingly. The staff detonates the blasting material at a safe distance, so as to conduct blasting to dredge the blocked position when the coal bunker door is closed, which not only avoids manual safety accidents but also achieves the effect of dredging the blockage in the coal bunker.

[0035] In addition, due to the fact that the outer contour of the split body has a taper that gradually decreases from bottom to top, the stability of the entire airbag is increased, providing guarantee for the lifting of the airbag. By setting the opening pressure of the upper split body to be greater than that of the lower split body, the stability of each split body layer from the bottom can be further ensured. During the use process, since the blocked positions in the coal bunker are at different heights, the airbag formed by arranging multiple split bodies folds the other layers of split bodies after reaching the predetermined height, so as to adapt to coal bunkers of different heights and blocked positions at different heights, increasing the flexibility and applicability of the use of this airbag.

[0036] In addition, by providing a pneumatic pressure regulating part between the respective split parts and connecting the pneumatic pressure regulating part to the upper split part and the lower split part through the first hose and the second hose, it is convenient to adjust the opening pressure of different split parts. The structure is simple and the adjustment is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0038] Figure 1 is a front view schematic diagram of the multi-section lifting airbag according to the embodiment of the present utility model;

[0039] Figure 2 is a connection cross-sectional schematic diagram of two adjacent split parts according to the embodiment of the present utility model;

[0040] Figure 3 is a connection cross-sectional three-dimensional schematic diagram of two adjacent split parts according to the embodiment of the present utility model;

[0041] Figure 4 is Figure 3 a partial enlarged view of I in

[0042] Figure 5 is Figure 3 a partial enlarged view of II in

[0043] Figure 6 is a cross-sectional schematic diagram of the application of the multi-section lifting airbag according to the embodiment of the present utility model in a coal bunker.

[0044] Description of the reference numerals:

[0045] 1, base; 2, split part; 3, insertion part; 4, pneumatic pressure regulating part; 5, first hose; 6, second hose; 7, strap;

[0046] 101, inflation port;

[0047] 201, cavity;

[0048] 301, convex ring; 302, socket part;

[0049] 401, sleeve; 402, sliding part; 403, fixing part; 404, fixing plate; 405, elastic part; 406, first transition cavity; 407, second transition cavity; 408, sealing ring;

[0050] 3011, vertical section; 3012, socket section;

[0051] 3021, vertical groove; 3022, slot;

[0052] 4021, main body; 4022, connecting ring; 4023, second ventilation hole;

[0053] 4031, first ventilation hole;

[0054] 4041, ventilation port. Specific embodiments

[0055] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0056] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "back", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0057] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific situations.

[0058] The present utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0059] This embodiment relates to a multi - section lifting airbag, which includes a base 1 and several segments 2 stacked above the base 1. There are insertion parts 3 between the base 1 and its adjacent segment 2, and between two adjacent segments 2. The insertion part 3 is arranged in a ring at a position close to the edge of the segment 2. Each segment 2 has a cavity 201 inside, and the base 1 is provided with an inflation port 101. When the base 1 and the segments 2 are filled with gas, the outer contour of the segment 2 has a taper that gradually decreases from bottom to top. The multiple segments 2 form a tower - shaped structure that gradually decreases from bottom to top, and the opening pressure of the segment 2 located in the upper part is greater than the opening pressure of its adjacent lower segment 2.

[0060] The multi-section lifting airbag of this embodiment is formed by arranging the split parts 2 stacked on top of the base 1, and connecting the base 1 with the split parts 2 and two adjacent split parts 2 together through the insertion part 3. The inflation port 101 provided on the base 1 is connected to the external gas source trachea, and gas is filled into the cavity 201 to gradually fill the cavity 201 in each split part 2 layer by layer. The blasting material at the top of the airbag can be lifted to the blocked part in the coal bunker accordingly. The staff detonates the blasting material at a safe distance, so as to conduct blasting to dredge the blocked part when the coal bunker door is closed, which not only avoids artificial safety accidents, but also achieves the effect of dredging the blockage in the coal bunker.

[0061] In addition, since the outer contour of the split part 2 has a taper that gradually decreases from bottom to top, the stability of the entire airbag is increased, providing guarantee for the lifting of the airbag. By setting the opening pressure of the upper split part 2 to be greater than that of the lower split part 2, the stability of each split part 2 from the bottom layer can be further ensured. During use, due to the different heights of the blocked positions in the coal bunker, the airbag formed by setting multiple split parts 2 will have the other split parts 2 in a folded state after reaching the predetermined height, so as to adapt to coal bunkers of different heights and blocked positions at different heights, increasing the flexibility and applicability of the use of this airbag.

[0062] Based on the above overall introduction, an exemplary structure of the multi-section lifting airbag of this embodiment is as Figures 1 to 3 shown. The base 1 is formed into a circular rotating body structure, and the diameter of the base 1 is greater than the diameter of the split part 2 located at its upper end. The inner cavity of each split part 2 is formed into a frustum-shaped rotating body structure with a taper after inflation, and the overall airbag is in a tower shape, ensuring the overall stability of the airbag.

[0063] As a preferred embodiment, as Figures 3 to 4 shown, an air pressure regulating part 4 is also provided between the base 1 and the split parts 2, and between each split part 2. A first hose 5 is provided at the lower end of the split part 2 and is connected to the adjacent split part 2 or the base 1 below it. A second hose 6 is provided at the upper end of the split part 2 and is connected to the adjacent split part 2 above it. The air pressure regulating part 4 is provided between the first hose 5 and the second hose 6.

[0064] In this embodiment, by setting the air pressure regulating part 4 between each split part 2, and connecting the air pressure regulating part 4 with the upper split part 2 and the lower split part 2 through the first hose 5 and the second hose 6, it is convenient to adjust the opening pressure of different split parts 2, and the structure setting is simple and the adjustment is convenient.

[0065] Furthermore, as Figures 3 to 4As shown in the figure, the air pressure adjustment part 4 includes a sleeve 401 sleeved outside the first hose 5 and the second hose 6, a sliding part 402 sliding axially along the sleeve 401, and a fixing part 403 fixed inside the sleeve 401. A fixing plate 404 arranged radially along the inner cavity of the sleeve 401 is also provided in the inner cavity of the sleeve 401. The fixing plate 404 abuts against the first hose 5, and an air vent 4041 is provided on the fixing plate 404. The inflation air flow enters the inner cavity of the sleeve 401 through the air vent 4041 and pushes the sliding part 402 to slide. A first air vent 4031 is provided on the fixing part 403, and the air in the inner cavity of the sleeve 401 enters the cavity 201 of the upper split part 2 through the first air vent 4031.

[0066] As Figure 4 shown in the figure, the first hose 5 is in an L shape, one end is communicated with the inner cavity of the upper split part 2, the other end is inserted into the inner cavity of the sleeve 401 and abuts against the fixing part 403. The second hose 6 is in a 7 - shape. One end of the second hose 6 is inserted into the inner cavity of the sleeve 401, and one end of the second hose 6 abuts against the fixing plate 404, and the other end is connected to the cavity 201 of the lower split part 2.

[0067] In addition, still as Figure 4 shown in the figure, the sleeve 401 is formed into a cylindrical tubular structure. The fixing plate 404 is integrally formed with the sleeve 401 or fixed in the inner cavity of the sleeve 401 by welding. The fixing part 403 is in a cylindrical block shape, and its outer diameter is adapted to the inner diameter of the sleeve 401. A round hole penetrating through itself is formed in the center of the fixing part 403, and the front end of the sliding part 402 is adapted to the diameter of the round hole.

[0068] Furthermore, still as Figure 4 shown in the figure, the sliding part 402 includes a main body 4021 and a connecting ring 4022 provided on the main body 4021. The outer wall of the connecting ring 4022 abuts against the inner wall of the sleeve 401. An elastic member 405 is provided between the connecting ring 4022 and the fixing part 403, and a through second air vent 4023 is provided on the connecting ring 4022. The main body 4021 is specifically cylindrical, and one end of the main body 4021 close to the air vent 4041 is formed into a conical structure. When not ventilated, due to the action of the elastic member 405, the main body 4021 abuts against the air vent 4041, and the first hose 5 and the second hose 6 cannot be ventilated.

[0069] Still as Figure 4 shown in the figure, when the air pressure in the first hose 5 is greater than the deformation pressure of the elastic member 405, the main body 4021 moves away from the air vent 4041, so that the air enters the inner cavity of the sleeve 401 from the first hose 5 and flows through the second air vent 4023 and the first air vent 4031 into the second hose 6. The deformation pressure of the elastic member 405 decreases layer by layer from the upper split part 2 to the lower split part 2. In this embodiment, the elastic member 405 adopts a telescopic spring and is sleeved on the main body 4021.

[0070] More specifically, still as Figure 4 shown, a first transition cavity 406 is formed between the connecting ring 4022 and the fixing plate 404, and a second transition cavity 407 is formed between the connecting ring 4022 and the fixing member 403. The elastic member 405 is disposed in the second transition cavity 407, and a sealing ring 408 is provided between the connecting ring 4022 and the sleeve 401. The connecting ring 4022 is formed into an annular structure, and a plurality of second vent holes 4023 are formed in a circumferential array on the connecting ring 4022. A plurality of first vent holes 4031 are formed in a circumferential array on the fixing member 403.

[0071] When the gas in the cavity 201 of the lower split body 2 is greater than the deformation pressure of the elastic member 405, air enters the first transition cavity 406 from the first hose 5, enters the second transition cavity 407 through the second vent holes 4023, and then enters the second hose 6 through the first vent holes 4031 to inflate the cavity 201 of the upper split body 2. Layer-by-layer inflation is performed as described above until the airbag abuts against the plugging portion of the coal bunker, and when the inflation pressure reaches a predetermined pressure, the inflation is stopped.

[0072] In order to facilitate the adjustment of the deformation pressure of the elastic members 405 of each layer, in this embodiment, the connecting ring 4022 is threadedly connected to the main body 4021. During adjustment, the position of the connecting ring 4022 on the main body 4021 is adjusted to change the length of the second transition cavity 407, so as to quickly and conveniently adjust the opening pressure of the upper split body 2. The structure is simple and easy to implement. In addition, the fixing member 403 is screwed and fixed to the sleeve 401. During installation, first determine the positions of the connecting ring 4022 and the main body 4021, insert the sliding member 402 into the inner cavity of the sleeve 401, then place the elastic member 405, and finally screw and fix the fixing member 403 and the sleeve 401 at a predetermined position.

[0073] In addition, as Figure 5 shown, the plugging portion 3 includes a convex ring 301 provided on the bottom surface of the upper split body 2 and a socket portion 302 provided on the top surface of the lower split body 2. The convex ring 301 extends towards the socket portion 302, and the socket portion 302 is formed with a groove for receiving the convex ring 301. By inserting the convex ring 301 into the groove, two adjacent split bodies 2 are connected, or the base 1 is connected to its adjacent split body 2. This method is convenient for operation and simple to assemble.

[0074] Furthermore, as Figures 2 to 5As shown, the convex ring 301 includes a vertical section 3011 and a socket section 3012; the groove is provided with a vertical groove 3021 covering the outside of the vertical section 3011 and a socket groove 3022 adapted to the socket section 3012, and both the socket section 3012 and the socket groove 3022 are in an inverted triangular structure. By providing the vertical section 3011 and the vertical groove 3021, it plays a role in guiding the insertion of the convex ring 301. By providing the socket section 3012 and the socket groove 3022, it avoids the separation between the two split parts 2 due to inflation or the separation between the split part 2 and the base 1, ensuring the stability of the airbag.

[0075] More specifically, in this embodiment, both the convex ring 301 and the groove are made of elastic materials such as nylon, plastic, etc. In addition, a strap 7 is provided on the split part 2 at the top, and the strap 7 is used to fix the explosive.

[0076] Preferably, the height H1 of the split part 2 in the lower layer is greater than the height H2 of the adjacent upper split part 2. The numerical difference range between H1 and H2 is between 30 mm and 50 mm. The numerical difference range between H1 and H2 can specifically be values such as 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, etc.

[0077] By fixing the explosive on the split part 2 at the topmost end of the airbag, when the airbag is sent into the coal bunker and inflated until the explosive abuts against the coal bunker blockage and inflation stops. At this time, the bunker door is closed. Since the base 1 has a large diameter and the split part 2 at the bottom layer has more gas and greater weight, it ensures that the airbag can stably support the explosive. At this time, the staff detonates the explosive at a safe distance, so as to conduct blasting when the coal bunker door is closed to dredge the blockage, which not only avoids artificial safety accidents but also achieves the effect of dredging the coal bunker blockage.

[0078] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-section lifting airbag, characterized in that: It comprises a base (1), and a plurality of split bodies (2) stacked on the base (1); A plug-in portion (3) is provided between the base (1) and its adjacent split body (2), and between two adjacent split bodies (2); The plug-in portion (3) is arranged in a ring shape at a position close to the edge of the split body (2); Each of the split bodies (2) is provided with a cavity (201) inside, and the base (1) is provided with an air filling port (101), and when the base (1) and the split bodies (2) are filled with gas, the outer contour of the split bodies (2) has a tapered shape that gradually decreases from bottom to top; The plurality of split bodies (2) form a tower-shaped structure that gradually becomes smaller from bottom to top, and the opening pressure of the split body (2) located at the top is greater than the opening pressure of the split body (2) adjacent to the lower end thereof.

2. A multi-section lifting airbag according to claim 1, characterized in that: An air pressure regulating portion (4) is also provided between the base (1) and the split body (2), and between each of the split bodies (2); The lower end of the split body (2) is provided with a first hose (5) connected to the split body (2) or the base (1) adjacent to the lower part thereof; The upper end of the split body (2) is provided with a second hose (6) connected to the split body (2) adjacent to its upper portion; The air pressure regulating portion (4) is arranged between the first hose (5) and the second hose (6).

3. A multi-section lifting airbag according to claim 2, characterized in that: The air pressure regulating part (4) comprises a sleeve (401) sleeved on the outside of the first hose (5) and the second hose (6), a sliding member (402) sliding axially along the sleeve (401), and a fixing member (403) fixed on the inside of the sleeve (401); The inner cavity of the sleeve (401) is further provided with a fixing plate (404) arranged along its radial direction, the fixing plate (404) abuts against the first hose (5), and the fixing plate (404) is provided with a vent (4041), and the inflation airflow enters the inner cavity of the sleeve (401) through the vent (4041) and pushes the sliding member (402) to slide; The fixing member (403) is provided with a first ventilation hole (4031), and the air in the inner cavity of the sleeve (401) enters the cavity (201) of the upper split body (2) through the first ventilation hole (4031).

4. A multi-section lifting airbag according to claim 3, characterized in that: The sliding member (402) comprises a main body (4021) and a connecting ring (4022) provided on the main body (4021), wherein the outer wall of the connecting ring (4022) abuts against the inner wall of the sleeve (401); An elastic member (405) is provided between the connecting ring (4022) and the fixing member (403), and a through second vent hole (4023) is provided on the connecting ring (4022); When the air pressure in the first hose (5) is greater than the deformation pressure of the elastic member (405), the main body (4021) moves away from the vent (4041), so that air enters the inner cavity of the sleeve (401) from the first hose (5) and flows into the second hose (6) through the second vent hole (4023) and the first vent hole (4031); The deformation pressure of the elastic member (405) decreases layer by layer from the split body (2) at the upper end to the split body (2) at the lower end.

5. A multi-section lifting airbag according to claim 4, characterized in that: A first transition cavity (406) is formed between the connecting ring (4022) and the fixing plate (404), and a second transition cavity (407) is formed between the connecting ring (4022) and the fixing member (403); The elastic member (405) is disposed in the second transition cavity (407), and a sealing ring (408) is provided between the connecting ring (4022) and the sleeve (401).

6. A multi-section lifting airbag according to claim 4, characterized in that: The connecting ring (4022) is threadably connected to the main body (4021).

7. The multi-section lifting airbag according to claim 1, characterized in that: The plug-in portion (3) comprises a convex ring (301) provided on the bottom surface of the split body (2) at the upper end, and a socket portion (302) provided on the top surface of the split body (2) at the lower end; The convex ring (301) extends toward the socket portion (302), and the socket portion (302) is formed with a groove for accommodating the convex ring (301).

8. The multi-section lifting airbag according to claim 7, characterized in that: The convex ring (301) comprises a vertical section (3011) and a socket section (3012); The groove is provided with a vertical groove (3021) covering the outside of the vertical section (3011), and a slot (3022) adapted to the socket section (3012); the socket section (3012) and the slot (3022) are both inverted triangle structures.

9. The multi-section lifting airbag according to claim 8, characterized in that: The convex ring (301) and the groove are both made of elastic material; A binding belt (7) is provided on the split body (2) at the top, and the binding belt (7) is used to fix the explosive.

10. A multi-section lifting airbag according to any one of claims 1 to 9, characterized in that: The height H1 of the split body (2) located at the lower layer is greater than the height H2 of the split body (2) located at the adjacent upper layer; The numerical difference between H1 and H2 ranges from 30mm to 50mm.

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