Mine water inrush early warning and monitoring device

Abstract

The invention discloses a mine water inrush early warning and monitoring device, and relates to the technical field of safety early warning, the mine water inrush early warning and monitoring device comprises an elastic damping plate, the elastic damping plate is hollow, inherent frequency detection mechanisms are symmetrically arranged in a hollow cavity, and the trigger ends of the inherent frequency detection mechanisms are connected with traction ropes; according to the invention, the traditional safety detection concepts of water level, temperature, humidity and the like are abandoned, the water inrush condition in the mine is detected from the perspective of vibration frequency, the underground condition is monitored from the source of the water inrush phenomenon, even if the disaster is inevitable, the escape time is reserved for workers, and the safety of the workers is ensured. In addition, the water inrush detection mechanism can be tightly attached to the mine wall and spread towards different stratums along with the well wall, the spiral expansion type tightly attached mode is adopted to make tight contact with the well wall, laying is convenient, underground operation is not affected, no electric power assistance is adopted, and the water inrush detection mechanism can adapt to the complex environment in the stratums.

Description

Technical Field

[0001] The invention relates to the technical field of safety early warning, and in particular to a mine water inrush early warning monitoring device. Background Art

[0002] Water inrush refers to the sudden large-scale water gushing that occurs during underground construction when passing through various strata (especially when encountering underground river systems), thick layers of water-containing gravel or large fractured zones connected to surface water. The occurrence of water inrush has a great impact on underground construction workers and underground projects.

[0003] For example, a water inrush monitoring device and a water inrush monitoring method disclosed in publication number CN110513149B monitor water inrush in a mine by monitoring water pressure or water level data at the same point of groundwater monitoring. This can reduce the number of processing terminals and communication terminals used, minimize the cost of the water inrush monitoring device, and achieve real-time monitoring of the entire water inrush process.

[0004] Although the water inrush detection methods currently available on the market, including the above-mentioned patented technology, can accurately detect water inrush, they can only be detected during or after the water inrush occurs. In fact, once a water inrush occurs, it cannot be stopped. The water layer will instantly break through the weak link connected to the mine tunnel and engulf the shaft in a very short time. Even if an alarm is sounded in time, construction workers deep in the mine have already been put in danger by the surge caused by the water inrush.

[0005] During mine excavation or mining, different strata will be experienced from the surface to deep underground, and there is a pressure difference between adjacent strata caused by stratum pressure, and underground undercurrents are mostly between strata, which will then produce relative vibrations between strata. Simply put, there is relative movement between strata in the crust under static conditions, and relative movement will produce relative vibrations. We usually call this relative vibration the inherent amplitude of the strata, and the fixed amplitudes of different strata are also different. Spatial vibrations will be generated during construction operations in underground wells. If the amplitude of the spatial vibration caused by the construction is close to, the same as, or exceeds the inherent amplitude of the stratum, then the possibility of inducing strong destructive resonance will greatly increase. If resonance is formed, the weak link rock layer between the water layer and the mine will be instantly pierced and quickly torn to form a huge water inrush, and a large amount of groundwater will rush into the mine under stratum pressure, causing a disaster.

[0006] Therefore, the present invention proposes a monitoring device that can give an early warning before a sudden water burst occurs, so as to reserve enough time for construction workers to avoid danger and escape before a sudden water burst occurs. Summary of the invention

[0007] The technical solution of the present invention aims at the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technologies. Specifically, the purpose of the present invention is to provide a mine water inrush early warning monitoring device to solve the problem proposed in the above background technology that the water inrush detection methods currently on the market, including the above patented technologies, can play a role in accurately detecting water inrush, but can only be detected during or after the water inrush occurs. In fact, once the water inrush occurs, it cannot be stopped. The water layer will instantly break the weak link connected to the mine tunnel and engulf the shaft in a very short time. Even if an alarm is sounded in time, the construction personnel deep in the mine have already been in danger of the surging flow caused by the water inrush.

[0008] To achieve the above object, the present invention provides the following technical solutions: a mine water inrush early warning monitoring device, comprising an elastic damping plate, the elastic damping plate is hollow and a natural amplitude detection mechanism is symmetrically arranged in the hollow cavity, a traction rope is connected to the outer wall of a vibration receiving ball in the natural frequency detection mechanism, and one end of the traction rope passes through the elastic damping plate and is connected to a driven metal ball; A mine vibration capture mechanism is installed directly below the driven metal ball and cooperates with the inherent amplitude detection mechanism to realize resonance detection.

[0009] Preferably, the elastic shock-absorbing plate is of spiral design, and the elastic shock-absorbing plate is spirally expanded and tightened in the mine, a guide wheel is fixedly installed on the outer wall of the elastic shock-absorbing plate at a position corresponding to the horizontal level of the traction rope, and the driven metal ball is suspended at the end of the traction rope after being horizontally guided by the guide wheel.

[0010] Preferably, the elastic shock-absorbing plate is made of plastic material and has a sound-absorbing and noise-reducing function, and a flexible side is arranged on a side of the elastic shock-absorbing plate close to the mine wall.

[0011] Preferably, the combination of the natural frequency detection mechanism and the in-mine vibration capture mechanism is distributed in a spiral posture in several groups.

[0012] Preferably, the inherent amplitude detection mechanism includes a metal ring, a fixing plate, a pillar, a vibration receiving ball, a guide rod and a second spring, and the side wall of the flexible side is symmetrically penetrated by a metal ring, a pillar is penetrated at the center of the metal ring, and a fixing plate that fits with the lower surface of the metal ring is fixed to the lower end of the pillar, and strip plates distributed at equal angles at the upper end of the pillar fit with the upper surface of the metal ring, a vibration receiving ball is arranged on the side of the metal ring, and the end of the traction rope located inside the elastic shock-absorbing plate is forked into two ropes in a Y shape and respectively fixedly connected with the outer walls of the two vibration receiving balls in a symmetrical manner; A guide rod is provided inside the vibration receiving ball for sliding through, and the end of the guide rod is fixed to the inner wall of the elastic shock-absorbing plate, a second spring is wound around the outer wall of the guide rod, and one end of the second spring is welded to the inside of the guide rod, and the other end of the second spring is fixed to the outer wall of the vibration receiving ball.

[0013] Preferably, the end of the metal ring is in contact with the well wall, and a first spring is provided between the metal ring and the pillar, one end of the first spring is welded to the side wall of the pillar, and the other end of the first spring is fixed to the inner wall of the metal ring.

[0014] Preferably, the vibration capture mechanism in the mine includes a vibration capture ball, a rotating rod, a fixed shaft, a swing plate and a slide rail, and a vibration capture ball is symmetrically arranged from top to bottom directly below the driven metal ball, and a fixed shaft fixedly connected to the outer wall of the elastic shock-absorbing plate is arranged on one side of the vibration capture ball, rotating rods are symmetrically arranged on the front and back sides of the vibration capture ball, and swing plates are symmetrically arranged on the outer wall of the fixed shaft in a spatially staggered manner, a slide rail is opened at the end of the swing plate, and the two rotating rods on the front and back sides of one vibration capture ball are respectively slidably arranged inside the two slide rails in a spatially staggered manner.

[0015] Preferably, a vortex spring is wound around the outer wall of the intersection of the fixed shaft and the swing plate, and the outer end of the vortex spring is welded to the outer wall of the through hole at the end of the swing plate, and the inner end of the vortex spring is fixed to the outer wall of the fixed shaft.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The driven metal ball shakes up and down according to the inherent amplitude of the stratum where it is located, while the vibration capture ball below repeats the cycle of vertically bouncing, colliding, fitting, and then bouncing again according to the changing amplitude of the construction vibration. Normally, there is a sufficient gap between the driven metal ball and the vibration capture ball, and there is no contact between the driven metal ball and the vibration capture ball. However, when the construction amplitude and the amplitude gradually approach, are equal to, or exceed the fixed amplitude between the corresponding strata, the vibration capture ball that bounces upward will gradually contact the driven metal ball that shakes up and down. In other words, when the two vibration amplitudes are close, the amplitude of the vibration capture ball will increase until it can collide with the driven metal ball. At the same time, the amplitude of the vibration capture ball will gradually increase and approach the shaking amplitude of the driven metal ball. Therefore, when the two amplitudes are close, that is, when resonance occurs, the vibration capture ball above will forcibly intervene in the shaking of the driven metal ball. In the amplitude, the following cycle will be repeated: "the vibration capture ball above bounces upward, collides with the shaking driven metal ball and bounces it up, then the vibration capture ball falls down, collides with another vibration capture ball and bounces up, and the bounced vibration capture ball collides with the falling driven metal ball again" and so on, thus achieving a regular impact sound. Therefore, when the above-mentioned impact cycle continues to occur, the long cycle time of the sound represents the duration of the resonance, and the sound size and clarity of the regular amplitude sound represent the amplitude of the resonance. Hearing a loud and regular amplitude sound means that a sharp and destructive resonance has occurred, which will greatly increase the possibility of risks such as water inrush or rock collapse. Construction workers should immediately move to a safe area before the resonance causes damage, so as to achieve early warning before water inrush occurs and reserve a certain amount of escape time for the workers.

[0017] The present invention abandons the traditional safety detection concepts such as water level, temperature, humidity, etc., and detects water inrush in the mine from the perspective of vibration amplitude, and monitors the underground situation from the source of the water inrush phenomenon. Even if a disaster is inevitable, it is enough to leave workers with time to escape. In addition, the water inrush detection mechanism in the present invention can be close to the mine wall and spread to different strata with the mine wall. It adopts a spiral expansion-type close-fitting method to closely contact the mine wall, which is convenient for laying and will not affect underground operations. It does not take any electrical assistance and can adapt to the complex environment in the stratum. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the assembly structure of the elastic damping plate of the present invention in a mine; Figure 2 It is a schematic diagram of a first three-dimensional structure of the elastic damping plate and the mine shaft of the present invention; Figure 3 It is a schematic diagram of a second three-dimensional structure of the elastic damping plate and the mine shaft of the present invention; Figure 4 It is a schematic diagram of a first three-dimensional structure of the elastic shock-absorbing plate of the present invention; Figure 5 It is a schematic diagram of a second three-dimensional structure of the elastic shock-absorbing plate of the present invention; Figure 6 It is a schematic diagram of the structure in the cross section of the elastic shock absorbing plate of the present invention; Figure 7 This is a positional relationship diagram of the driven metal ball and the vibration capture mechanism in the mine of the present invention; Figure 8 It is a structural schematic diagram of the vibration capture mechanism in the mine of the present invention; Fig. 9 For the present invention Figure 4 The enlarged structural diagram at A in the middle; Fig.10 For the present invention Figure 6 Enlarged structural diagram at B in the middle.

[0019] In the figure: 1. elastic shock-absorbing plate; 11. flexible side; 2. metal ring; 21. fixed plate; 22. support; 23. first spring; 24. vibration receiving ball; 25. guide rod; 26. second spring; 3. traction rope; 31. guide wheel; 4. driven metal ball; 5. vibration capturing ball; 51. rotating rod; 6. fixed shaft; 61. vortex spring; 7. swing plate; 71. slide rail. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-10 The present invention provides a technical solution: a mine water inrush early warning monitoring device, comprising an elastic damping plate 1, the elastic damping plate 1 is hollow and a natural amplitude detection mechanism is symmetrically arranged in the hollow cavity, the outer wall of the vibration receiving ball 24 in the natural frequency detection mechanism is connected to a traction rope 3, and one end of the traction rope 3 passes through the elastic damping plate 1 and is connected to a driven metal ball 4; A vibration capture mechanism in the mine is installed directly below the driven metal ball 4 and cooperates with the inherent amplitude detection mechanism to realize resonance detection.

[0022] The elastic shock-absorbing plate 1 is of spiral design, and the elastic shock-absorbing plate 1 is spirally expanded and tightened in the mine. A guide wheel 31 is fixedly installed on the outer wall of the elastic shock-absorbing plate 1 at a position corresponding to the horizontal level of the traction rope 3, and the driven metal ball 4 is suspended at the end of the traction rope 3 after being horizontally guided by the guide wheel 31.

[0023] The elastic damping plate 1 is made of plastic material and has the function of silencing and reducing noise. A flexible side edge 11 is arranged on one side of the elastic damping plate 1 close to the mine wall.

[0024] The combination of the natural frequency detection mechanism and the mine vibration capture mechanism is distributed in a spiral posture and has several groups.

[0025] The inherent amplitude detection mechanism includes a metal ring 2, a fixed plate 21, a pillar 22, a vibration receiving ball 24, a guide rod 25 and a second spring 26, and the side wall of the flexible side 11 is symmetrically penetrated by the metal ring 2, the center of the metal ring 2 is penetrated by the pillar 22, and the lower end of the pillar 22 is fixed with a fixed plate 21 that fits with the lower surface of the metal ring 2, and the strip plates at equal angles distributed on the upper end of the pillar 22 fit with the upper surface of the metal ring 2, the side of the metal ring 2 is provided with a vibration receiving ball 24, and the end of the traction rope 3 located inside the elastic damping plate 1 is forked into two ropes in a Y shape and respectively fixedly connected with the outer walls of the two vibration receiving balls 24 in a symmetrical manner; A guide rod 25 is provided inside the vibration receiving ball 24 and slides through it. The end of the guide rod 25 is fixed to the inner wall of the elastic shock-absorbing plate 1. A second spring 26 is wound around the outer wall of the guide rod 25. One end of the second spring 26 is welded to the inside of the guide rod 25, and the other end of the second spring 26 is fixed to the outer wall of the vibration receiving ball 24.

[0026] The end of the metal ring 2 is in contact with the well wall, and a first spring 23 is provided between the metal ring 2 and the pillar 22 . One end of the first spring 23 is welded to the side wall of the pillar 22 , and the other end of the first spring 23 is fixed to the inner wall of the metal ring 2 .

[0027] The vibration capture mechanism in the mine includes a vibration capture ball 5, a rotating rod 51, a fixed shaft 6, a swing plate 7 and a slide rail 71, and the vibration capture ball 5 is symmetrically arranged from top to bottom directly below the driven metal ball 4, and a fixed shaft 6 fixedly connected to the outer wall of the elastic shock-absorbing plate 1 is arranged on one side of the vibration capture ball 5, the rotating rod 51 is symmetrically arranged on the front and back sides of the vibration capture ball 5, and the swing plate 7 is symmetrically arranged on the outer wall of the fixed shaft 6 in a spatially staggered manner, and the slide rail 71 is opened at the end of the swing plate 7, and the two rotating rods 51 on the front and back sides of a vibration capture ball 5 are respectively slidably arranged inside the two spatially staggered symmetrical slide rails 71.

[0028] A vortex spring 61 is wound around the outer wall of the intersection of the fixed shaft 6 and the swing plate 7 , and the outer end of the vortex spring 61 is welded to the outer wall of the through hole at the end of the swing plate 7 , and the inner end of the vortex spring 61 is fixed to the outer wall of the fixed shaft 6 .

[0029] Working principle: When using the mine water inrush warning monitoring device, first Figure 1 , Figure 2 and Figure 3As shown, the elastic shock-absorbing plate 1 is stretched and placed inside the mine, and after the elastic shock-absorbing plate 1 is loosened, the elastic shock-absorbing plate 1 will automatically expand and make the flexible side 11 close to the well wall. Since the elastic shock-absorbing plate 1 has certain flexibility and plasticity (the inherent amplitudes between adjacent strata are different, but the elastic shock-absorbing plate 1 has a good energy absorption effect so that the influence between two adjacent fixed amplitude detections is almost non-existent), the elastic shock-absorbing plate 1 can be regularly laid in the well by pulling it, so that the pulled elastic shock-absorbing plate 1 is laid from top to bottom in each stratum in the well, and at the same time, the driven metal ball 4 suspended at each position is vertically corresponding to the vibration capture ball 5 below.

[0030] The fixed amplitude of the formation will produce vibration effects on the inherent amplitude detection mechanism in the formation area, such as Figure 5 As shown, the two groups of metal rings 2 close to the well wall will synchronously surround the outside of the pillar 22 after being affected by the vibration and generate the same amplitude under the support of several groups of first springs 23. At this time, the inherent amplitude of the formation will be converted and reflected on the two groups of metal rings 2, and the two groups of metal rings 2 that generate vibration will collide with the corresponding vibration receiving balls 24 with a fixed amplitude. After receiving the fixed amplitude collision, the vibration receiving balls 24 will reciprocate along the outer wall of the smooth guide rod 25 under the support of the second spring 26 and achieve the effect of enhancing the vibration effect, so that the inherent amplitude of the formation inside the elastic shock-absorbing plate 1 is transmitted to the external driven metal ball 4 through the corresponding traction rope 3, so that the up and down strokes of the driven metal ball 4 are consistent with the corresponding inherent amplitude of the formation inside the elastic shock-absorbing plate 1, and a shaking change of "loose and tight, tight and loose" occurs, and the outer end of the traction rope 3 will also synchronously and adaptively undergo a shaking change of "up and down, down and up" according to the fixed amplitude.

[0031] Then, if Figure 4 and Figure 7As shown, when construction work is carried out in the mine, spatial vibration will inevitably be generated and transmitted by the spatial gas with low circulation in the shaft (there is a fixed amplitude in the stratum, and since the surface construction work has little effect on the stratum amplitude, the inner wall of the mine still occurs according to the fixed amplitude of the stratum). The construction vibration transmitted in the shaft space will be received by the two vibration capture balls 5. Under normal circumstances, the construction vibration will not be very large in the form of space, but in the construction of some large-scale operating machinery such as tunneling, stone crushing and other operations, the amplitude and amplitude will be greatly increased. When the construction amplitude reaches a certain level, the vibration amplitude will be captured by the two vertically fitted vibration capture balls 5, which will cause the two vibration capture balls 5 to gradually bounce vertically. Since the two vibration capture balls 5 are limited and reset by the swing plates 7 on both sides and the vortex springs 61, the two vibration capture balls 5 used to capture construction vibrations will repeatedly produce "vertical expansion to impact fit and then rebound vertical expansion" based on the construction amplitude, and the cycle of the action change will be shortened as the construction amplitude increases.

[0032] In the above, the driven metal ball 4 shakes up and down according to the inherent amplitude of the stratum where it is located, while the vibration capture ball 5 below repeats the cycle of vertically bouncing open, colliding, fitting, and then bouncing open again according to the changing amplitude of the construction vibration. Normally, a sufficient gap is reserved between the driven metal ball 4 and the vibration capture ball 5, and there is no contact between the driven metal ball 4 and the vibration capture ball 5. However, when the construction amplitude and the vibration amplitude gradually approach, are equal to, or exceed the fixed amplitude between the corresponding strata, the vibration capture ball 5 that bounces upward will gradually contact the driven metal ball 4 that shakes up and down. In other words, when the two vibration amplitudes are close to each other, the amplitude of the vibration capture ball 5 will increase until it can collide with and contact the driven metal ball 4. At the same time, the amplitude of the vibration capture ball 5 will gradually accelerate and approach the shaking amplitude of the driven metal ball 4. Therefore, when the two amplitudes are close, That is, when resonance occurs, the vibration capture ball 5 above will forcibly intervene in the shaking amplitude of the driven metal ball 4, thereby repeating the following cycle: "the vibration capture ball 5 above bounces upward, collides with the shaking driven metal ball 4 and bounces it up, then the vibration capture ball 5 falls down, collides with another vibration capture ball 5 and bounces up, and the bounced vibration capture ball 5 collides with the fallen driven metal ball 4 again" and so on, thereby achieving a regular impact sound. Therefore, when the above-mentioned impact cycle continues to occur, the long cycle time of the sound represents the duration of the resonance, and the sound size and clarity of the regular amplitude sound represent the amplitude of the resonance. Hearing a loud and regular amplitude sound means that a sharp and destructive resonance has occurred, and construction workers should immediately move to a safe area before the resonance causes damage.

[0033] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mine water inrush early warning monitoring device, comprising an elastic shock absorbing plate (1), characterized in that: The elastic damping plate (1) is hollow and a natural amplitude detection mechanism is symmetrically arranged in the hollow cavity, the outer wall of the vibration receiving ball (24) in the natural amplitude detection mechanism is connected to a traction rope (3), and one end of the traction rope (3) passes through the elastic damping plate (1) and is connected to a driven metal ball (4); A mine vibration capture mechanism is installed directly below the driven metal ball (4) and cooperates with the inherent amplitude detection mechanism to achieve resonance detection.

2. A mine water inrush early warning monitoring device according to claim 1, characterized in that: The elastic damping plate (1) is of spiral design, and the elastic damping plate (1) is spirally expanded and braced in the mine, a guide wheel (31) is fixedly installed on the outer wall of the elastic damping plate (1) at a position corresponding to the horizontal direction of the traction rope (3), and a driven metal ball (4) is suspended at the end of the traction rope (3) after being horizontally guided by the guide wheel (31).

3. A mine water inrush early warning monitoring device according to claim 1, characterized in that: The elastic shock absorbing plate (1) is made of plastic material and has a sound-absorbing and noise-reducing function; a flexible side edge (11) is provided on a side of the elastic shock absorbing plate (1) close to the mine wall.

4. A mine water inrush early warning monitoring device according to claim 1, characterized in that: The combination of the inherent amplitude detection mechanism and the vibration capture mechanism in the mine is distributed in a spiral posture and has several groups.

5. A mine water inrush early warning monitoring device according to claim 3, characterized in that: The inherent amplitude detection mechanism comprises a metal ring (2), a fixing plate (21), a support (22), a vibration receiving ball (24), a guide rod (25) and a second spring (26), and the side wall of the flexible side edge (11) is symmetrically penetrated by the metal ring (2), the center of the metal ring (2) is penetrated by the support (22), and the lower end of the support (22) is fixed with a fixing plate (21) which is in contact with the lower surface of the metal ring (2), and the upper end of the support (22) is in contact with the upper surface of the metal ring (2), and the strip plates distributed at equal angles are in contact with the upper surface of the metal ring (2), and the side of the metal ring (2) is provided with a vibration receiving ball (24), and the end of the traction rope (3) located inside the elastic damping plate (1) is forked into two ropes in a Y shape and respectively fixedly connected to the outer walls of the two vibration receiving balls (24) in a symmetrical manner; A guide rod (25) is provided inside the vibration receiving ball (24) and slides through it. The end of the guide rod (25) is fixed to the inner wall of the elastic damping plate (1). A second spring (26) is wound around the outer wall of the guide rod (25). One end of the second spring (26) is welded to the inside of the guide rod (25), and the other end of the second spring (26) is fixed to the outer wall of the vibration receiving ball (24).

6. A mine water inrush early warning monitoring device according to claim 5, characterized in that: The end of the metal ring (2) is in contact with the well wall, and a first spring (23) is provided between the metal ring (2) and the support (22), one end of the first spring (23) is welded to the side wall of the support (22), and the other end of the first spring (23) is fixed to the inner wall of the metal ring (2).

7. A mine water inrush early warning monitoring device according to claim 1, characterized in that: The in-mine vibration capture mechanism comprises a vibration capture ball (5), a rotating rod (51), a fixed shaft (6), a swing plate (7) and a slide rail (71), and a vibration capture ball (5) is symmetrically arranged from top to bottom directly below the driven metal ball (4), and a fixed shaft (6) fixedly connected to the outer wall of the elastic damping plate (1) is arranged on one side of the vibration capture ball (5), the front and back sides of the vibration capture ball (5) are symmetrically arranged with rotating rods (51), and the outer wall of the fixed shaft (6) is symmetrically arranged with a swing plate (7) in a spatially displaced manner, and the end of the swing plate (7) is provided with a slide rail (71), and the two rotating rods (51) on the front and back sides of one vibration capture ball (5) are respectively slidably arranged inside the two spatially displaced symmetrical slide rails (71).

8. A mine water inrush early warning monitoring device according to claim 7, characterized in that: A vortex spring (61) is wound around the outer wall of the intersection of the fixed shaft (6) and the swing plate (7), and the outer end of the vortex spring (61) is welded to the outer wall of the through hole at the end of the swing plate (7), and the inner end of the vortex spring (61) is fixed to the outer wall of the fixed shaft (6).

Images