Portable device and method for mitigating pump station flap impact forces

Abstract

The present application provides a portable device and a method for relieving the impact force of a pump station flap, which comprises: an inertia disc for containing fluid sheared with a brake vane, the inertia disc being interference fitted with a fixed shaft of the pump station flap; a surface of the inertia disc facing the pump station flap is concave to form a containing cavity I for containing fluid; a fluid filler receiving box for providing fluid, which is provided with a containing cavity II in communication with the containing cavity I, the volume of the containing cavity II being adjustable; a transmission turntable for driving the brake vane to do centrifugal motion, the transmission turntable being arranged in the containing cavity I of the inertia disc; one end of the brake vane is hinged to a surface of the transmission turntable, and the other end is a free end; a resistance reset unit for prolonging the action time of the brake vane with the fluid and resetting the brake vane in the radial direction; and a sealing plate for sealing the surface of the inertia disc facing the pump station flap. The present application can slow down the impact speed of the pump station flap and reduce the impact force of the pump station flap on the door seat when the pump station flap is closed.

Description

Technical Field

[0001] This invention belongs to the technical field of large pump station flap gates, and particularly relates to a lightweight device and method for mitigating the impact force of pump station flap gates. Background Technology

[0002] my country has the largest number of pumping stations in the world, characterized by rapid development, large scale, diverse types, and wide coverage. There are three common backflow prevention methods used in pumping stations: siphon interruption, quick-acting gate interruption, and flap gate interruption. Among these, flap gate interruption is the simplest. A flap gate consists of a door leaf, hinge, seat, and seals. The door leaf is mounted on the seat via hinges (the rotating shaft and fixed shaft of the flap gate), and relies on rubber seals for water stoppage, which also serve as a buffer when the door leaf closes.

[0003] However, the existing technology has the following drawbacks: 1) Due to the heavy weight of the flap gate, the buffering effect of the rubber seal is minimal. Therefore, after the pump station stops, the flap gate, affected by water pressure and gravity, still exerts a significant impact force on the pipeline (the flap gate strikes the pipeline outlet, but is also affected by oscillations and waves, as well as internal water hammer, which impacts the internal pipeline). This greatly increases the mechanical wear during flap gate operation and reduces its service life. 2) For some pump stations, the large flap gates used exert a significant impact force on the gate seat structure (the flap gate is hinged to the gate seat structure, which is fixed to the pipeline outlet) when closed. Prolonged impact can affect the structural safety of the pump house and its internal equipment. Currently, my country lacks mature technologies to mitigate the impact force of flap gates, so this problem has not been well solved. Therefore, reducing the impact force when the flap gate closes through optimized design and other solutions is of great reference value for subsequent related research. Summary of the Invention

[0004] The purpose of this invention is to provide a lightweight device and method for mitigating the impact force of a pump station flap gate. This device reduces the impact velocity of the flap gate, decreases the impact force on the gate seat when the flap gate closes, reduces mechanical losses during operation, and thus extends the service life of the pump station flap gate. To achieve the above objective, the following technical solution is adopted:

[0005] A lightweight device for mitigating the impact force of a pump station flap gate includes:

[0006] An inertia disk is used to contain fluid sheared by the brake pads. The inertia disk is interference-fitted with the fixed shaft of the pump station flap gate. The surface of the inertia disk facing the pump station flap gate is recessed to form a receiving cavity for containing the fluid.

[0007] A fluid-filled storage box for providing the fluid, wherein a second receiving cavity is provided that communicates with the first receiving cavity, and the volume of the second receiving cavity is adjustable;

[0008] A transmission turntable is used to drive the brake pads to perform centrifugal motion. The transmission turntable is placed in the receiving cavity of the inertia disc and is riveted to the rotating shaft of the pump station flap gate to achieve rotation with the pump station flap gate within the receiving cavity. It is rotatably connected to the fixed shaft of the pump station flap gate to limit its position within the receiving cavity of the inertia disc.

[0009] One end of the brake pad is rotatably mounted on the surface of the transmission turntable, and the other end is a free end; a plurality of the brake pads are distributed along the circumference of the transmission turntable; the brake pads are positioned toward the pump station flap gate.

[0010] The resistance reset unit is used to extend the interaction time between the brake pad and the fluid and reset the brake pad radially. It is arranged corresponding to the brake pad, with one end swinging with the brake pad and the other end fixed to the transmission turntable.

[0011] And a sealing plate, used to seal the surface of the inertia disc facing the pump station flap gate.

[0012] Preferably, the resistance reset unit includes:

[0013] A fixing block is fixed to the side of the transmission turntable facing the sealing plate; a preset installation gap exists between the fixing block and the brake pad;

[0014] A connecting pin is arranged radially and passes through the brake pad and the fixing block in sequence, with a spring sleeved on it;

[0015] The spring is located between the mounting gaps, with one end fixed to the outer wall of the brake pad and the other end fixed to the fixing block.

[0016] Preferably, a protective layer is provided on the surface of the transmission turntable facing the sealing plate, and the protective layer is riveted to the rotating shaft of the pump station flap gate and rotatably connected to the fixed shaft of the pump station flap gate.

[0017] Preferably, the protective layer has three connecting holes for riveting the rotating shaft of the pump station flap gate, and each connecting hole penetrates the protective layer and the transmission turntable.

[0018] Preferably, the protective layer is flush with the inertial disk.

[0019] Preferably, the protective layer has a positioning hole for connecting the fixed shaft of the pump station flap gate, and the positioning hole passes through the protective layer, the transmission turntable and the inertia disk in sequence.

[0020] Preferably, a movable piece that can move along the inner wall of the second receiving cavity is installed on the fluid filling storage box; the fluid is placed in the space enclosed by the movable piece, the second receiving cavity, and the first receiving cavity.

[0021] Preferably, the fluid in the fluid filler storage box is a shear-thickening fluid.

[0022] A method for mitigating the impact force of a pump station flap gate includes the following steps:

[0023] Step 1: Before the pump station flap gate closes, reduce the volume of the second receiving cavity to push the fluid in the receiving box from the second receiving cavity of the fluid filling receiving box into the first receiving cavity of the inertial disk.

[0024] Step 2: The pump station flap gate closes, rotates around the fixed axis of the pump station flap gate and falls, the pump station flap gate drives the pump station flap gate rotating shaft to rotate, and the pump station flap gate rotating shaft drives the transmission turntable to rotate.

[0025] At this time, under the action of centrifugal force and resistance reset unit, the brake pads on the transmission turntable move radially away from the center of the circle along the transmission turntable, and the brake pads engage with the fluid.

[0026] Step 3: After the pump station flap gate is closed, increase the volume of the second receiving cavity to return the inertial disk from the first receiving cavity to the second receiving cavity of the fluid filling box;

[0027] At the same time, under the action of the resistance reset unit, the brake pads on the transmission turntable move radially along the transmission turntable towards the center and are reset.

[0028] Compared with the prior art, the advantages of the present invention are:

[0029] (1) When the pump station flap gate closes, the brake pads on the transmission turntable move radially away from the center under the action of centrifugal force and resistance reset unit, and the brake pads engage with the fluid. That is, when the transmission turntable 3 rotates, the brake pads move radially relative to the transmission turntable, and the free end of the brake pads begins to make shear contact with the paste pushed from the fluid filling material collection box into the receiving cavity by the movable pads, thereby slowing down the movement of the brake pads, thereby slowing down the rotation speed of the transmission turntable, thereby slowing down the closing speed of the pump station flap gate, increasing its closing time, and reducing the impact force when it is fully closed.

[0030] (2) Using batter, a shear-thickening fluid, as a filler, the batter is derived from flour and water, which is low in cost. The greater the force applied to the batter and the shorter the time, the better the elasticity and the harder the batter. The brake pad is tangential to the batter, resulting in energy exchange, which reduces the rotation speed of the transmission turntable and increases the time required for the flap gate to close.

[0031] (3) Connect the pump station flap gate with three connection holes. At the same time, the fixed shaft of the pump station flap gate is connected to the device through the positioning hole to ensure the stable, safe and reliable operation of the pump station flap gate. Attached Figure Description

[0032] Figure 1 A front view of a lightweight device used to mitigate the impact force of a pump station flap gate;

[0033] Figure 2 A cross-sectional view of a lightweight device used to mitigate the impact force of a pump station flap gate;

[0034] Figure 3 This is an enlarged view of the resistance reset unit;

[0035] Figure 4 A first view of a pump station flap gate without a lightweight device installed to mitigate the impact force of the flap gate.

[0036] Figure 5 First view of a pump station flap gate after the installation of a lightweight device for mitigating the impact force of the pump station flap gate;

[0037] Figure 6 A line graph showing the relationship between the impact velocity of the flap gate and the initial closing angle of the flap gate in a pumping station.

[0038] Figure 7 A line graph showing the relationship between the impact force of the flap gate and the initial closing angle of the flap gate in a pumping station.

[0039] Figure 8 This is a state diagram of the resistance reset unit before the flap gate of the pump station closes.

[0040] Among them, 1-inertia disk, 2-fluid filling storage box, 3-transmission turntable, 4-protective layer, 5-brake pad, 6-retainer, 7-connecting pin, 8-spring, 9-connecting hole, 10-positioning hole, 11-moving piece, 12-pump station flap gate, 13-rotation shaft of pump station flap gate, 14-fixed shaft of pump station flap gate. Detailed Implementation

[0041] The following will describe in more detail the lightweight device and method for mitigating the impact force of a pump station flap gate according to the present invention, with reference to the schematic diagrams, which illustrate preferred embodiments of the invention. It should be understood that those skilled in the art can modify the invention described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the invention.

[0042] like Figures 1-5 A lightweight device for mitigating the impact force of a pump station flap gate 12 includes: an inertia disk 1, a fluid filling storage box 2, a transmission turntable 3, a brake pad 5, a resistance reset unit, a protective layer 4, and a sealing plate.

[0043] As can be seen from the prior art, the rotating shaft 13 of the pump station flap gate is rotatably mounted on the fixed shaft 14 of the pump station flap gate; the rotating shaft is fixed on the pump station flap gate 12 (flap gate leaf).

[0044] An inertia disk 1 is used to contain the fluid sheared by the brake pad 5. The inertia disk 1 is interference-fitted with the fixed shaft 14 of the pump station flap gate. The surface of the inertia disk 1 facing the pump station flap gate 12 is recessed to form a fluid-containing cavity. An opening is provided at the bottom of the outer edge of the inertia disk 1, which is connected to the fluid filling material storage box 2.

[0045] During the closing process of the pump station flap gate 12, the inertial disk 1 remains stationary, while the transmission turntable 3 rotates within the receiving cavity. Therefore, the two operate independently and do not interfere with each other.

[0046] A fluid-filling container 2 (shear-thickening fluid-filling container) is connected to the outer edge of the bottom of the inertial disk 1 and is used to supply fluid. It has a second receiving cavity communicating with the first receiving cavity, and the volume of the second receiving cavity is adjustable. Specifically, the bottom of the fluid-filling container 2 is a movable piece 11 that can move along the inner wall of the second receiving cavity. The fluid is placed within the space enclosed by the movable piece 11, the second receiving cavity, and the first receiving cavity. Further, the fluid is a shear-thickening fluid, whose viscosity increases with the shear rate when sheared. The first receiving cavity is located above the second receiving cavity. Specifically, an external force acts on the movable piece 11 to change the volume of the second receiving cavity, thereby pushing the fluid in the first receiving cavity into the second receiving cavity.

[0047] The transmission turntable 3 drives the brake pad 5 to perform centrifugal motion. The transmission turntable 3 is independently placed within the receiving cavity of the inertia disk 1. It is riveted to the rotating shaft 13 of the pump station flap gate to rotate with the pump station flap gate 12 within the receiving cavity. It is rotatably connected to the fixed shaft 14 of the pump station flap gate to confine it within the receiving cavity of the inertia disk 1. When the transmission turntable 3 rotates, it drives the brake pad 5, the retainer 6, the connecting pin 7, and the spring 8 to rotate together. The center of the circle refers to the center of the transmission turntable 3. Preferably, the outer edge of the transmission turntable 3 has an irregular contour, and the brake pad 5 is only installed on the convex portion, which further saves material.

[0048] One end of the brake pad 5 is hinged to the surface of the transmission turntable 3 via a retainer 6, and the other end is a free end; several brake pads 5 are distributed along the circumference of the transmission turntable 3; the brake pads 5 are positioned towards the pump station flap gate 12. Preferably, the retainer 6 can be a hinge shaft. Specifically, the brake pad 5 is subjected to centrifugal force and is tangential to the shear-thickening fluid pushed into the inertia disk 1's receiving cavity by the movable pad 11, resulting in energy exchange and prolonging the time required for the flap gate to close; at the same time, under the action of the resistance reset unit, the interaction time between the brake pad 5 and the fluid is prolonged, further consuming the energy of the transmission turntable 3, and ultimately reducing the speed of the transmission turntable 3, thereby reducing the impact speed of the pump station flap gate 12.

[0049] The resistance reset unit is used to extend the interaction time between the brake pad 5 and the fluid and to reset the brake pad 5 radially. It is arranged corresponding to the brake pad 5, with one end swinging with the brake pad 5 and the other end fixed to the transmission turntable 3.

[0050] Specifically, the resistance reset unit includes: a fixing block, a connecting pin 7, and a spring 8.

[0051] A fixing block is fixed to the side of the transmission turntable 3 facing the sealing plate; a preset installation gap exists between the fixing block and the brake pad 5.

[0052] Connecting pin 7 is arranged radially and passes sequentially through brake pad 5 and fixing block, with spring 8 sleeved on it. For example... Figure 3 As shown, this is the closed state of the pump station flap gate. The end of the connecting pin 7 is limited within the limiting groove on the brake pad 5 by a limiting block, so that the connecting pin 7 can swing with the brake pad 5. During operation, when the brake pad 5 rotates around the retainer 6 as a reference point (e.g. Figure 3 As shown), the connecting pin 7 moves downward to the boundary of the limiting groove under the action of force, at which time the spring 8 is pulled open (as shown). Figure 8 As shown, spring 8 is in a stretched state at this time. Due to the restorative property of spring 8, after its speed decreases, spring 8 will restore brake pad 5. At this time, connecting pin 7 also returns to its original state. Figure 3 As shown.

[0053] Spring 8, located within the mounting gap, has one end fixed to the outer wall of brake pad 5 and the other end fixed to a fixing block. When the transmission turntable 3 rotates, spring 8 is subjected to centrifugal force, causing elastic deformation. Figure 5 The diagram shown is a state diagram of the pump station flap gate 12 after it has been closed.

[0054] The protective layer 4 increases the shear area, thereby effectively preventing shear damage between the connecting nail 7 and the transmission turntable 3, thus protecting the operation of the device. The protective layer 4 is provided on the surface of the transmission turntable 3 facing the sealing plate. The protective layer 4 is riveted to the rotating shaft 13 of the pump station flap gate and rotatably connected to the fixed shaft 14 of the pump station flap gate.

[0055] The protective layer 4 is flush with the outer surface of the inertia disk 1. The protective layer 4 has three connection holes 9 for riveting the rotating shaft 13 of the pump station flap gate. Each connection hole 9 passes through the protective layer 4 and the transmission disc 3, but not through the inertia disk 1, helping the device to be riveted to the rotating shaft 13 of the pump station flap gate to achieve connection with the pump station flap gate 12. The protective layer 4 has a positioning hole 10 for connecting the fixing shaft 14 of the pump station flap gate. The positioning hole 10 is located at the center of the portable device and passes through the protective layer 4, the transmission disc 3, and the inertia disk 1 in sequence.

[0056] A sealing plate is used to seal the surface of the inertia disk 1 facing the pump station flap gate 12. Specifically, the sealing plate has openings for mounting the rotating shaft 13 and the fixed shaft 14 of the pump station flap gate.

[0057] Preferably, the lightweight device is installed on both sides of the fixed shaft 14 of the pump station flap gate, constraining the closing process of the pump station flap gate 12 from both sides. Under the action of its own weight, water pressure, and the lightweight device, the impact speed is reduced, the impact time is delayed, and the impact force is reduced (by reducing the impact speed, the impact time is delayed, and thus the impact force is reduced), thereby extending the service life of the pump station flap gate 12. That is, each of the two inertial disks 1 is connected to the rotating shaft 13 of the pump station flap gate through three connecting holes 9.

[0058] In this embodiment, the device is installed on the pump station flap gate and operated as follows: The device has a connecting hole 9 for connecting the rotating shaft 13 of the pump station flap gate, and a positioning hole 10 for connecting the fixed shaft 14 of the pump station flap gate and stabilizing the overall system. To increase the overall safety and reliability of the system, the device is riveted to the rotating shaft 13 of the pump station flap gate using three connecting holes 9. The device is installed on both sides of the fixed shaft 14 of the pump station flap gate, and its operation is controlled simultaneously from both sides of the fixed shaft 14.

[0059] In this embodiment, the working process is as follows: When the transmission turntable 3 rotates, the brake pad 5 on the transmission turntable 3 is subjected to centrifugal force and makes planar motion. The connecting pin 7 of the nested spring 8 is affected by centrifugal force and pushes the brake pad 5 to move radially along the transmission turntable 3, and shears the batter pushed from the shearing thickened fluid filler storage box 2 into the inertia disk 1 receiving cavity by the movable piece 11.

[0060] In this embodiment, the method for mitigating the impact force of the pump station flap gate includes the following steps:

[0061] Step 1: Before the pump station flap gate 12 closes, an external force pushes the movable plate 11 to reduce the volume of the second receiving cavity so that the fluid in the fluid filling material receiving box 2 is pushed from the second receiving cavity of the fluid filling material receiving box 2 into the first receiving cavity of the inertial disk 1.

[0062] Step 2: The pump station flap gate 12 begins to close under its own weight and water pressure. The pump station flap gate 12 rotates around the fixed shaft 14 and falls. The pump station flap gate 12 drives the rotating shaft 13 of the pump station flap gate to rotate, and the rotating shaft of the pump station flap gate 12 drives the transmission turntable 3 to rotate.

[0063] At this time, under the action of centrifugal force and resistance reset unit, the brake pad 5 on the transmission turntable 3 moves radially away from the center of the circle, and the brake pad 5 engages with the fluid. That is, when the transmission turntable 3 rotates, the brake pad 5 moves radially relative to the transmission turntable 3, and the free section of the brake pad 5 (the part not hinged by the retainer 6, the end of which forms a free end) begins to make shear contact with the paste pushed from the fluid filler collection box 2 into the receiving cavity by the movable piece 11, thereby slowing down the movement of the brake pad 5, thereby slowing down the rotation speed of the transmission turntable 3, thereby slowing down the closing speed of the pump station flap gate 12, increasing its closing time, and reducing the impact force when it is fully closed.

[0064] Step 3: After the pump station flap gate 12 is closed, the external force pulls the movable plate 11 in the opposite direction, increasing the volume of the second receiving cavity. The first receiving cavity of the inertial disk 1 automatically flows back into the second receiving cavity of the fluid filling box 2.

[0065] At the same time, under the action of the resistance reset unit, the brake pad 5 on the transmission turntable 3 moves radially towards the center of the turntable 3 and is reset.

[0066] When drainage stops during actual engineering construction, the pump station flap gate 12 closes under its own weight and water pressure. After the device is installed, the pump station flap gate 12 closes slowly, thereby reducing the impact force of the flap gate, reducing mechanical wear of the flap gate, and thus extending the life of the flap gate.

[0067] Specifically, in this embodiment, the dimensions of the pump station flap gate 12 are set to 2m × 2m × 0.05m, and the material is set to cast iron with a density of 7.2g / cm³. 3 .

[0068] The inertia disk 1 has a diameter of 13cm, the positioning hole 10 has a size of 0.72cm, the connecting hole 9 has a diameter of 0.58cm, the brake pad 5 has a length of 3.61cm, the spring 8 has a length of 1.15cm, and the transmission turntable 3 has a maximum diameter of 4.91cm and a minimum diameter of 3.75cm.

[0069] The thickness of the fluid filling storage box 2 is equal to the thickness of the inertia disk 1, and the curvature of the movable piece 11 is equal to the curvature of the inertia disk 1.

[0070] In this embodiment, vertical downward is defined as 0°, and counterclockwise rotation is defined as the positive direction. The experimental results are shown in Table 1.

[0071] Table 1. Experimental Results on the Relationship between the Starting Angle of Flap Gate Closure and the Impact Velocity of the Flap Gate Leaf

[0072]

[0073] In this embodiment, based on experimental results, the relationship between the flap gate's closing initiation angle and the flap gate's impact velocity before and after using this buffer device can be obtained, as shown in the line graph below. Figure 6 As shown. By Figure 6 It can be seen that there is a positive correlation between the flap gate closing start angle and the flap gate leaf impact velocity. Comparing before and after the installation of this buffer device (portable device), under the same flap gate closing start angle, the flap gate leaf impact velocity after the installation of this buffer device is lower than that before installation, and the larger the start angle, the more obvious the effect of reducing the impact velocity. Therefore, this buffer device has a significant effect on reducing the flap gate impact velocity and extending the service life of pump station flap gates.

[0074] like Figure 7 As shown, since the mass of the pump station flap gate 12 is significantly larger than that of the portable device, the mass of this portable device is negligible compared to the mass of the pump station flap gate 12 in the calculation. Therefore, using the momentum theorem, assuming an impact time of 0.01s, the magnitude of the impact force before and after installation can be calculated as follows: Figure 7 As shown in the diagram, after installing this buffer device, the impact force of the pump station's flap gate is reduced, by an average of 98 kN. As the flap gate's initial closing angle increases, the impact force continues to increase, making the effect of reducing impact force more pronounced.

[0075] In this embodiment, the inertia disk, transmission turntable, and brake pad 5 components used in this device are inexpensive. The inertia disk costs 300 yuan, the transmission turntable costs 100 yuan, the brake pad 5 costs 20 yuan, and the shearing thickening fluid - paste costs 5 yuan. Therefore, the cost of this device is approximately 425 yuan.

[0076] Without a buffer device, the damage to the flap gate and related equipment in the pumping station caused by excessive impact would amount to approximately 10,000 yuan. Assuming that mechanical wear due to impacts necessitates annual replacement of the pumping station flap gate during a construction project, this would incur approximately 10,000 yuan in material and labor costs annually. However, with this buffer device, the flap gate will not easily deform or break due to excessive impact, and the paste material is readily available, inexpensive, and resistant to damage. The buffer device has a lifespan of 3 months, and installing two devices each time would cost 3,400 yuan annually. Compared to not installing the buffer device, this saves 6,600 yuan annually. In summary, this buffer device offers extremely high economic benefits.

[0077] The above are merely preferred embodiments of the present invention and do not constitute any limitation on the present invention. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and content disclosed in the present invention without departing from the scope of the present invention shall be deemed to have remained within the protection scope of the present invention.

Claims

1. A lightweight device for relieving the impact force of a pump station flap, characterized in that The application relates to a fluid filling box, a driving rotary disc, a resistance reset unit, a sealing plate, an inertial disc, and a brake shoe. The inertial disc is used for containing fluid sheared by the brake shoe, and the inertial disc is in interference fit with a fixed shaft of a pump station flap; the surface of the inertial disc towards the pump station flap is concave to form a containing cavity I for containing the fluid; The fluid filling box is used for providing the fluid, and a containing cavity II is formed in the fluid filling box and is in communication with the containing cavity I; the volume of the containing cavity II is adjustable; The driving rotary disc is used for driving the brake shoe to make centrifugal motion, and the driving rotary disc is arranged in the containing cavity I of the inertial disc; the driving rotary disc is riveted with a rotating shaft of the pump station flap to realize rotation with the pump station flap in the containing cavity I, and the driving rotary disc is rotationally connected with the fixed shaft of the pump station flap to be limited in the containing cavity I of the inertial disc; One end of the brake shoe is rotationally arranged on the surface of the driving rotary disc, and the other end is a free end; a plurality of brake shoes are distributed along the circumference of the driving rotary disc; the brake shoe is arranged towards the pump station flap; The resistance reset unit is used for prolonging the action time of the brake shoe and the fluid and resetting the brake shoe in the radial direction, and the resistance reset unit is arranged in correspondence with the brake shoe, one end of the resistance reset unit can swing with the brake shoe, and the other end of the resistance reset unit is fixed to the driving rotary disc; The sealing plate is used for sealing the surface of the inertial disc towards the pump station flap.

2. The lightweight device for mitigating the impact force of a pump station flap as defined in claim 1, wherein, The resistance reset unit comprises: The fixed block is fixed to the side of the driving rotary disc towards the sealing plate; a preset installation gap is arranged between the fixed block and the brake shoe; The connecting pin is arranged in the radial direction and sequentially passes through the brake shoe and the fixed block, and a spring is sleeved on the connecting pin; The spring is arranged between the installation gaps, one end of the spring is fixed to the outer wall of the brake shoe, and the other end of the spring is fixed to the fixed block.

3. The lightweight device for mitigating the impact force of a pump station flap as defined in Claim 1, wherein, The surface of the driving rotary disc towards the sealing plate is provided with a protective layer, the protective layer is riveted with the rotating shaft of the pump station flap and is rotationally connected with the fixed shaft of the pump station flap.

4. The lightweight device for mitigating the impact force of a pump station flap as defined in claim 3, wherein, The protective layer is provided with three connecting holes for riveting the rotating shaft of the pump station flap, and each connecting hole penetrates the protective layer and the driving rotary disc.

5. The lightweight device for mitigating the impact force of a pump station flap as defined in claim 3, wherein, The protective layer is flush with the inertial disc.

6. The lightweight device for mitigating the impact force of a pump station flap as defined in claim 3, wherein, The protective layer is provided with a positioning hole for connecting the fixed shaft of the pump station flap, and the positioning hole sequentially penetrates the protective layer, the driving rotary disc and the inertial disc.

7. The lightweight device for relieving the impact force of a pump station flap as defined in claim 1, wherein The fluid filling box is provided with a movable piece which can move along the inner wall of the containing cavity II; the fluid is arranged in the space surrounded by the movable piece, the containing cavity II and the containing cavity I.

8. The lightweight device for relieving the impact force of a pump station flap as defined in claim 1, wherein, The fluid in the fluid filling box is a shear thickening fluid.

9. A method of mitigating the impact of a pump station flap, the portable device for mitigating the impact of a pump station flap according to any one of claims 1-8, wherein, The application comprises the following steps: Step 1: before the pump station flap is closed, the volume of the containing cavity II in the fluid filling box is reduced to push the fluid in the fluid filling box from the containing cavity II into the containing cavity I of the inertial disc; Step 2: when the pump station flap is closed, the pump station flap rotates around the fixed shaft of the pump station flap and falls, the pump station flap drives the rotating shaft of the pump station flap to rotate, and the rotating shaft of the pump station flap drives the driving rotary disc to rotate; At this time, the brake shoe on the driving rotary disc makes radial motion away from the center of the driving rotary disc under the action of centrifugal force and the resistance reset unit, and the brake shoe is engaged with the fluid; Step 3: after the pump station flap is closed, the volume of the containing cavity II is increased to return the fluid in the containing cavity I to the containing cavity II. Meanwhile, the brake vane on the transmission turntable is under the action of the resistance reset unit, the brake vane does the radial movement close to the center of the circle along the transmission turntable and resets.

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