Intelligent device and process for ultrahigh-pressure water gushing plugging in tunnel
Through the intelligent control system driving the rotating part and the bent chute, uniform extraction points and sealing of the water inlet points in the tunnel are solved, and the uneven extraction points of the water inlet points caused by frequent movement of the probe head is solved, and the safety of the tunnel project is improved Sex and progress.
Patent Information
- Application Number
- CN202411235177.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2024-12-10
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The ultra-high pressure water rush sealing intelligent device in the existing tunnel needs to be frequently calibrated due to frequent movement of the detector head, which may lead to uneven production points of the water rush point, and some water rush points are ignored, affecting the safety and progress of the tunnel project.
The intelligent control system drives the rotary part through the bent chute and the limit part to cooperate with the position of the driving point part along the bent chute, so as to achieve uniform water gushing point in the tunnel, and through electric telescopic parts Communication with the probe head and the intelligent control system, automatically determine and block the water inrush point.
A uniform collection point and sealing of water rush points in the tunnel is achieved, avoiding water rush seepage, and improving the safety and progress of tunnel projects.
Smart Images

Figure CN119102690A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of water gushing blocking in tunnels, and in particular relates to an intelligent device for blocking water gushing in tunnels with ultra-high pressure and a process thereof. Background Art
[0002] During the tunnel construction process, groundwater problems are often encountered, especially the phenomenon of ultra-high pressure water gushing. In this case, traditional blocking methods are often difficult to deal with, which can easily lead to delays in project progress, frequent safety accidents and waste of resources. Therefore, ultra-high pressure water gushing blocking intelligent device has emerged as an emerging tunnel construction technology. Based on modern sensing technology, automatic control technology and computer technology, the device can monitor the water gushing situation in real time in the tunnel, and automatically adjust the blocking strategy according to the water gushing pressure, flow and other information to achieve efficient and safe blocking effect.
[0003] At present, due to the complex structure inside the tunnel, especially when encountering karst development areas with ultra-high pressure water gushing, it is usually necessary to conduct sampling point detection in all areas to determine the water gushing points, and then seal all the water gushing points. Therefore, most of the current ultra-high pressure water gushing sealing intelligent devices use a control system to control the frequent movement of the detection head to conduct sampling point detection in all areas.
[0004] However, the current intelligent device for sealing ultra-high pressure water inrush in tunnels has some problems when in use: since a control system is used to control the frequent movement of the detection head, the multiple movements of the detection head may require frequent calibration. If the calibration is inaccurate or untimely, it will lead to uneven sampling of water inrush points, which may cause some water inrush points to be ignored, making it impossible to fully control the water inrush. The water inrush may continue to penetrate, affecting the safety and progress of the tunnel project. In this regard, an intelligent device for sealing ultra-high pressure water inrush in tunnels and a process thereof are proposed. Summary of the invention
[0005] In order to solve the above-mentioned problems existing in the prior art, the present invention provides an intelligent device for sealing ultra-high pressure water gushing in a tunnel and a process thereof, which solves the problem that the prior art adopts a control system to control the frequent movement of the detection head. The multiple movements of the detection head may require frequent calibration. If the calibration is inaccurate or untimely, it will lead to uneven sampling of water gushing points, which may cause some water gushing points to be ignored, so that the water gushing cannot be fully controlled, and the water gushing may continue to penetrate, affecting the safety and progress of the tunnel project.
[0006] The object of the present invention can be achieved by the following technical solutions: an intelligent device for blocking water inrush at ultra-high pressure in a tunnel, comprising an intelligent control system, a device body for blocking water inrush, and a sampling point mechanism arranged on the device body, wherein both the device body and the sampling point mechanism are connected to the intelligent control system for communication;
[0007] The mining mechanism comprises a rotating part, a first sliding part, a first guide part, a second guide part arranged perpendicular to the first guide part, a second sliding part slidably arranged on the second guide part, a limiting part and a mining part arranged on the second sliding part; a curved slide groove is arranged on the rotating part, and the two ends of the curved slide groove are closed to form a ring, the rotating part and the first guide part are respectively arranged on the equipment body, the first sliding part is slidably arranged on the first guide part, one end of the limiting part is arranged on the first guide part, and the other end of the limiting part slides through the first sliding part into the curved slide groove, and the rotating part cooperates with the limiting part to drive the first guide part and the second guide part to synchronously reciprocate horizontally through the curved slide groove, and the limiting part drives the second sliding part to reciprocate along the second guide part in a direction perpendicular to the first guide part by changing its position in the curved slide groove, so that the mining part uniformly mines water gushing points in the tunnel.
[0008] As a further solution of the present invention, the bending type slide groove is composed of a plurality of bending structures, and two adjacent bending structures are arc structures.
[0009] As a further solution of the present invention, the angle between two adjacent bending structures of the bending type slide groove is an obtuse angle.
[0010] As a further solution of the present invention, the sampling point part includes an electric telescopic member and a detection head connected to the electric telescopic member, and the detection head and the electric telescopic rod are both communicatively connected to the intelligent control system.
[0011] As a further solution of the present invention, the extension and retraction frequency of the electric telescopic rod is the same as the movement frequency of the second sliding part.
[0012] As a further solution of the present invention, a guide groove is provided on the first sliding portion, the guide groove is vertically arranged with the second guide portion, and the limiting portion slides in the guide groove.
[0013] A process for blocking ultra-high pressure water inrush in a tunnel, comprising the following steps:
[0014] S1: First, the intelligent control system is used to control the main body of the equipment to move to the ultra-high pressure water sampling position in the tunnel;
[0015] S2: The rotation of the rotating part is controlled by the intelligent control system. The rotating part drives the limiting part to move through its own curved chute. The limiting part drives the first guide part and the second guide part to synchronously perform horizontal reciprocating motion. The limiting part cooperates with different positions of the curved part of the curved chute to drive the second sliding part to reciprocate along the second guide part in a direction perpendicular to the first guide part, so that the second guide part drives the sampling part to uniformly sample the water gushing points in the tunnel.
[0016] S3: The detection head of the sampling point unit uploads the sampling results to the control terminal of the intelligent control system. The control terminal judges the sampling results. If it is judged to be a water gushing point, the control terminal controls the main body of the equipment to block the water gushing point.
[0017] S4: Repeat the above steps until sampling is performed in all water gushing areas in the tunnel, and then the locations judged to be water gushing points are blocked.
[0018] As a further solution of the present invention, the equipment body in S1 includes a blocking plate, the top of the blocking plate is a rigid structure, the bottom of the blocking plate is a flexible structure, and the bottom of the blocking plate is in contact with the water gushing point.
[0019] As a further solution of the present invention, the bottom edge of the blocking plate is a flexible structure that is folded outward.
[0020] As a further solution of the present invention, the bottom center of the blocking plate is a wave-shaped structure.
[0021] The beneficial effects of the present invention are:
[0022] The motor is driven to move through the intelligent control system, and the motor drives the rotating part to rotate. The rotating part drives the first guide part and the second guide part to move back and forth synchronously horizontally through the bending slide and the limit part. The limit part drives the second sliding part to move back and forth along the second guide part in a direction perpendicular to the first guide part by changing its position in the bending slide, so that the sampling part moves from left to right, then moves forward in a direction perpendicular to the horizontal direction, and then from right to left, so as to uniformly sample water gushing points in the tunnel, which solves the problem of frequent movement of the detection head controlled by the control system in the prior art. The multiple movements of the detection head may require frequent calibration. If the calibration is inaccurate or untimely, it will lead to uneven sampling of water gushing points, which may cause some water gushing points to be ignored, so that the water gushing cannot be fully controlled, and the water gushing may continue to penetrate, affecting the safety and progress of the tunnel project. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.
[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;
[0025] Figure 2 It is a side view of the point-collecting mechanism of the present invention;
[0026] Figure 3 It is a left view of the sampling mechanism of the present invention;
[0027] Figure 4 It is a schematic diagram of the structure of the bending type slideway of the present invention;
[0028] Figure 5 It is a schematic diagram of the position of the guide groove of the present invention.
[0029] Description of main component symbols:
[0030] In the figure: 1. Equipment body; 2. Picking point mechanism; 21. Rotating part; 211. Bend-type slide groove; 22. First sliding part; 23. First guide part; 24. Second guide part; 25. Second sliding part; 26. Limiting part; 27. Picking point part; 3. Hydraulic cylinder; 4. Guide groove. DETAILED DESCRIPTION
[0031] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.
[0032] See also Figure 1-5 The present embodiment provides an intelligent device for plugging water inrush at ultra-high pressure in a tunnel, comprising an intelligent control system, a device body 1 for plugging water inrush, and a sampling mechanism 2 arranged on the device body 1, wherein the device body 1 and the sampling mechanism 2 are both in communication connection with the intelligent control system; the intelligent control system comprises a safety protection system, a data processing and communication system, a monitoring system and a control system, the intelligent control system controls the device body 1 to move to a position to be sampled, and then the intelligent control system controls the sampling mechanism 2 to perform sampling, the sampling mechanism 2 comprises a rotating part 21, a first sliding part 22, a first guide part 23, a second guide part 24 arranged vertically to the first guide part 23, a second sliding part 25 slidably arranged on the second guide part 24, a limiting part 26 and a sampling part 27 arranged on the second sliding part 25;
[0033] The first guide portion 23 is fixedly connected to the second guide portion 24, and the first guide portion 23 and the second guide portion 24 are not in the same plane. Figure 2 As shown, the first guide part 23 is above the second guide part 24, the rotating part 21 is a rotating wheel, the rotating wheel is driven by a motor, the motor and the intelligent control system are communicated, a curved slide groove 211 is arranged on the rotating part 21, and the two ends of the curved slide groove 211 are closed into a ring, the rotating part 21 and the first guide part 23 are respectively arranged on the equipment body 1, the first sliding part 22 is slidably arranged on the first guide part 23, one end of the limiting part 26 is arranged on the first guide part 23, the limiting part 26 is fixedly connected to the first guide part 23, and the other end of the limiting part 26 slides through the first sliding part 22 to the curved slide groove 211, and the rotating part 21 cooperates with the limiting part 26 through the curved slide groove 211 to drive the first guide part 23 and the second guide part 24 to move back and forth synchronously horizontally, as shown in FIG. Figure 2As shown, the horizontal reciprocating motion of the first guide portion 23 and the second guide portion 24 is a left-right reciprocating motion. The left-right here is defined for the convenience of understanding the direction of motion and is limited to Figure 2 As shown, the limiting part 26 drives the second sliding part 25 to move back and forth along the second guide part 24 in a direction perpendicular to the first guide part 23 by changing its position in the bent slide groove 211, so that the sampling part 27 uniformly samples the water gushing points in the tunnel;
[0034] The limiting part 26 can be a limiting rod, the first guide part 23 and the second guide part 24 are both guide blocks, and a trapezoidal structure is provided on the guide block to prevent the first sliding part 22 and the second sliding part 25 from being separated from the first guide part 23 and the second guide part 24 respectively. The sampling part 27 here includes an electric telescopic part and a detection head connected to the electric telescopic part. The detection head and the electric telescopic rod are both communicated and connected to the intelligent control system. The detection head is used to detect the position of the ultra-high pressure water gushing point. The actual movement of the sampling part 27 is from left to right, then forward or backward along a direction perpendicular to the horizontal direction, and then from right to left. Forward or backward is adapted according to the direction of the bent slide groove 211. If it is Figure 2 For example, in Figure 2 The second guide portion 24 in the figure moves inwardly, that is, forwardly, along a direction perpendicular to the horizontal direction. Here, from left to right and from right to left only define that the initial position of the second sliding portion 25 is at the leftmost end. In fact, the initial position of the second sliding portion 25 can be at the leftmost end or at the rightmost end. The definition here is for the convenience of understanding the direction of movement.
[0035] At present, in the process of tunnel construction, groundwater problems are often encountered, especially the phenomenon of ultra-high pressure water gushing. In this case, ultra-high pressure water gushing intelligent blocking device is usually used to block the water gushing. The device is based on modern sensing technology, automatic control technology and computer technology. It can monitor the water gushing situation in the tunnel in real time and automatically adjust the blocking strategy according to the water gushing pressure, flow and other information to achieve efficient and safe blocking effect. However, due to the complex structure in the tunnel, especially when encountering karst development areas with ultra-high pressure water gushing, it is usually necessary to conduct sampling detection in all areas to determine the water gushing point, and then All water gushing points need to be blocked, so the current ultra-high pressure water gushing blocking intelligent devices mostly use a control system to control the frequent movement of the detection head, so as to conduct sampling detection in all areas. However, there are some problems when using the current ultra-high pressure water gushing blocking intelligent devices in tunnels: Since the control system is used to control the frequent movement of the detection head, the multiple movements of the detection head may require frequent calibration. If the calibration is inaccurate or untimely, it will lead to uneven sampling of water gushing points, which may cause some water gushing points to be ignored, so that the water gushing cannot be completely controlled, and the water gushing may continue to penetrate, affecting the safety and progress of the tunnel project.
[0036] In order to solve the above problems, in the present embodiment, the motor is driven to move by the intelligent control system, and the motor drives the rotating part 21 to rotate. The rotating part 21 cooperates with the limiting part 26 through the bent slide groove 211 to drive the first guide part 23 and the second guide part 24 to synchronously move back and forth horizontally. The limiting part 26 drives the second sliding part 25 to move back and forth along the second guide part 24 in a direction perpendicular to the first guide part 23 by changing its position in the bent slide groove 211, so that the sampling part 27 moves from left to right, then moves forward in a direction perpendicular to the horizontal direction, and then moves from right to left, so as to uniformly sample the water gushing points in the tunnel, which solves the problem of frequent movement of the detection head controlled by the control system in the prior art. The multiple movements of the detection head may require frequent calibration. If the calibration is inaccurate or untimely, it will lead to uneven sampling of the water gushing points, which may cause some water gushing points to be ignored, so that the water gushing cannot be fully controlled, and the water gushing may continue to penetrate, affecting the safety and progress of the tunnel project.
[0037] In addition, in order to enable the first guide portion 23 and the second guide portion 24 to synchronously and continuously perform horizontal reciprocating motions for multiple times, the limiting portion 26 can also drive the second sliding portion 25 to reciprocate along the second guide portion 24 in a direction perpendicular to the first guide portion 23 by changing its position in the bent slide 211, so that the sampling portion 27 moves from left to right, then forward in a direction perpendicular to the horizontal direction, and then from right to left, so as to uniformly sample the water gushing points in the tunnel. In this regard, in one embodiment, the bent slide 211 is composed of a plurality of bent structures, and the two adjacent bent structures are arc structures, and the angle between the two adjacent bent structures of the bent slide 211 is an obtuse angle, such as Figure 4 As shown, although the structure of the bending type slide groove 211 is annular, it is not a uniform circle, but changes along the rotating ring, and the depth of the bending type slide groove 211 needs to ensure that the limit rod can not be separated from the bending type slide groove 211, but the limit rod will not touch the bottom of the groove of the bending type slide groove 211, and only when the angle between the two adjacent bending structures of the bending type slide groove 211 is an obtuse angle, the sampling point portion 27 can be moved from left to right, then forward in a direction perpendicular to the horizontal direction, and then from right to left. The arc structure of the two adjacent bending structures is to reduce the friction resistance at the corner. In addition, it must be ensured that the telescopic frequency of the electric telescopic rod is the same as the moving frequency of the second sliding part 25. This design can ensure that the distance between each group of sampling points of the sampling point portion 27 is the same.
[0038] Furthermore, since the first sliding portion 22 slides left and right along the first guide portion 23, in order to make the first sliding portion 22 slide a larger distance, the range of lateral sampling can be made wider. In this regard, in one embodiment, a guide groove 4 is provided on the first sliding portion 22, and the guide groove 4 is perpendicularly arranged to the second guide portion 24. The guide groove 4 is a flat groove, and the flat groove is perpendicularly arranged to the second guide portion 24. The limit portion 26 slides in the guide groove 4, such as Figure 5 shown.
[0039] A process for blocking ultra-high pressure water inrush in a tunnel, comprising the following steps:
[0040] S1: First, the intelligent control system is used to control the device body 1 to move to the ultra-high pressure water gushing sampling position in the tunnel;
[0041] S2: The rotating part 21 is controlled to rotate by the intelligent control system. The rotating part 21 drives the limiting part 26 to move through its own curved chute 211. The limiting part 26 drives the first guide part 23 and the second guide part 24 to synchronously perform horizontal reciprocating motion. The limiting part 26 cooperates with different positions of the curved part of the curved chute 211 to drive the second sliding part 25 to reciprocate along the second guide part 24 in a direction perpendicular to the first guide part 23, so that the second guide part 24 drives the sampling part 27 to uniformly sample the water gushing points in the tunnel.
[0042] S3: The detection head of the sampling point unit 27 uploads the sampling result to the control terminal of the intelligent control system. The control terminal judges the sampling result. If it is judged to be a water gushing point, the control terminal controls the device body 1 to block the water gushing point.
[0043] S4: Repeat the above steps until sampling is performed in all water gushing areas in the tunnel, and then the locations judged to be water gushing points are blocked.
[0044] It is worth mentioning that when sealing the ultra-high pressure water gushing point, due to the high pressure inside the water gushing point, it is difficult to ensure the best sealing effect by using an ordinary sealing structure due to the influence of water pressure. There may be leakage, which will still have a certain impact on the safety and progress of the tunnel project. In order to solve this problem, in one embodiment, the equipment body 1 in S1 includes a sealing plate. In addition to the sealing plate, the equipment body 1 also has a hydraulic cylinder 3. The hydraulic cylinder 3 is communicated with the intelligent control system. The hydraulic cylinder 3 drives the sealing plate to seal the water gushing point. The top of the sealing plate is a rigid structure. The rigid structure at the top can ensure that the upper part of the sealing plate will not be deformed when subjected to force, thereby maintaining the overall stability. The bottom of the sealing plate is a flexible structure. The flexible structure at the bottom can make the sealing plate better adapt to the irregularity or movement of the bottom. Even if the bottom surface is uneven or has a certain displacement, it can It can maintain a good sealing effect. The bottom of the sealing plate is in contact with the water gushing point. The bottom edge of the sealing plate is a flexible structure that folds outward. The flexible structure that folds outward can firstly play a buffering role when it is impacted or under pressure, thereby protecting the sealing plate and the components it seals from damage. Secondly, it can better fill the gaps between joints or interfaces, thereby improving the sealing effect of the sealing plate. Thirdly, it can adapt to changes in different shapes or surfaces, and match the uneven or complex-shaped surfaces in the tunnel while maintaining a good sealing effect. The bottom center of the sealing plate is a wavy structure. When the wavy structure is impacted, due to its unique design, it can absorb and disperse the impact energy, thereby reducing vibration. At the same time, the wavy structure can also improve the bending and compression resistance of the sealing plate without adding too much weight, and can effectively withstand forces from different directions, making the sealing plate more stable and durable in complex environments.
[0045] The working principle and use process of the present invention:
[0046] When in use, the motor is driven to move through the intelligent control system, and the motor drives the rotating part 21 to rotate. The rotating part 21 cooperates with the limiting part 26 to drive the first guide part 23 and the second guide part 24 to move back and forth synchronously horizontally through the curved slide groove 211. The limiting part 26 drives the second sliding part 25 to move back and forth along the second guide part 24 in a direction perpendicular to the first guide part 23 by changing its position in the curved slide groove 211, so that the sampling part 27 moves from left to right, then forward in a direction perpendicular to the horizontal direction, and then from right to left, so as to uniformly sample the water gushing points in the tunnel. The detection head of the sampling part 27 uploads the sampling results to the control terminal of the intelligent control system. The control terminal judges the sampling results. If it is judged to be a water gushing point, the control terminal controls the device body 1 to block the water gushing point. The above operation is repeated until all the water gushing areas in the tunnel are sampled, and then the position judged to be the water gushing point is blocked.
[0047] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.
Claims
1. An intelligent device for blocking ultra-high pressure water inrush in a tunnel, characterized in that: It includes an intelligent control system, a device body for blocking water inrush, and a sampling point mechanism arranged on the device body, wherein both the device body and the sampling point mechanism are connected to the intelligent control system in communication; The mining mechanism comprises a rotating part, a first sliding part, a first guide part, a second guide part arranged perpendicular to the first guide part, a second sliding part slidably arranged on the second guide part, a limiting part and a mining part arranged on the second sliding part; a curved slide groove is arranged on the rotating part, and the two ends of the curved slide groove are closed to form a ring, the rotating part and the first guide part are respectively arranged on the equipment body, the first sliding part is slidably arranged on the first guide part, one end of the limiting part is arranged on the first guide part, and the other end of the limiting part slides through the first sliding part into the curved slide groove, and the rotating part cooperates with the limiting part to drive the first guide part and the second guide part to synchronously reciprocate horizontally through the curved slide groove, and the limiting part drives the second sliding part to reciprocate along the second guide part in a direction perpendicular to the first guide part by changing its position in the curved slide groove, so that the mining part uniformly mines water gushing points in the tunnel.
2. According to claim 1, an intelligent device for blocking ultra-high pressure water inrush in a tunnel is characterized in that: The bending type slide groove is composed of a plurality of bending structures, and two adjacent bending structures are arc structures.
3. The intelligent device for blocking ultra-high pressure water inrush in a tunnel according to claim 2, characterized in that: The angle between two adjacent bending structures of the bending slide groove is an obtuse angle.
4. The intelligent device for blocking ultra-high pressure water inrush in a tunnel according to claim 1, characterized in that: The sampling point part includes an electric telescopic part and a detection head connected to the electric telescopic part. The detection head and the electric telescopic rod are both connected to the intelligent control system for communication.
5. The intelligent device for blocking ultra-high pressure water inrush in a tunnel according to claim 4, characterized in that: The telescopic frequency of the electric telescopic rod is the same as the moving frequency of the second sliding part.
6. The intelligent device for blocking ultra-high pressure water inrush in a tunnel according to claim 1, characterized in that: The first sliding part is provided with a guide groove, the guide groove is vertically arranged with the second guide part, and the limiting part slides in the guide groove.
7. A process for blocking ultra-high pressure water inrush in a tunnel, based on an intelligent device for blocking ultra-high pressure water inrush in a tunnel according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: First, the intelligent control system is used to control the main body of the equipment to move to the ultra-high pressure water sampling position in the tunnel; S2: The intelligent control system is used to control the rotation of the rotating part. The rotating part drives the limiting part to move through its own bent slide. The limiting part drives the first guide part and the second guide part to synchronously perform horizontal reciprocating motion. The limiting part cooperates with different positions of the bent part of the bent slide. In this way, the second sliding part is driven to move back and forth along the second guide part in a direction perpendicular to the first guide part, so that the second guide part drives the sampling part to uniformly sample the water gushing points in the tunnel; S3: The detection head of the sampling point unit uploads the sampling results to the control terminal of the intelligent control system. The control terminal judges the sampling results. If it is judged to be a water gushing point, the control terminal controls the main body of the equipment to block the water gushing point. S4: Repeat the above steps until sampling is performed in all water gushing areas in the tunnel, and then the locations judged to be water gushing points are blocked.
8. The process for blocking ultra-high pressure water inrush in a tunnel according to claim 7, characterized in that: The equipment body in S1 includes a blocking plate, the top of the blocking plate is a rigid structure, the bottom of the blocking plate is a flexible structure, and the bottom of the blocking plate is in contact with the water gushing point.
9. The process for blocking ultra-high pressure water inrush in a tunnel according to claim 8, characterized in that: The bottom edge of the blocking plate is a flexible structure folded outward.
10. The process for blocking ultra-high pressure water inrush in a tunnel according to claim 8, characterized in that: The bottom center of the blocking plate is a wave-shaped structure.
