A method of closing a combined gate

Abstract

The application relates to the technical field of underground engineering construction, and discloses a closing method of a combined gate, the combined gate comprising N sub-gates which are sequentially and spacedly distributed along the fluid flow direction, N>=2, the N sub-gates can be individually controlled to open and close and the opening degree can be controlled; the position where the fluid flows first is regarded as the front, the position where the fluid flows last is regarded as the rear, if the fluid can pass through the last sub-gate, the combined gate is in an open state, and if the fluid cannot pass through the last sub-gate, the combined gate is in a closed state; during the process that the combined gate is converted from the open state to the closed state: when the last sub-gate starts to perform the closing action, at least one sub-gate in front has performed the closing action and has stopped the closing action, or is performing the closing action, or starts to perform the closing action synchronously with the last sub-gate. The closing logic designed in the application can make the last sub-gate easier to close.

Description

Technical Field

[0001] This invention relates to the field of underground engineering construction technology, and in particular to a method for closing a combined gate. Background Technology

[0002] In the field of underground engineering construction, tunneling machines (tunnel boring machines, pipe jacking machines) are widely used as modern automated mechanical equipment. Tunneling machines are mainly used for underground excavation work and need to be paired with a screw conveyor to synchronously transport the excavated soil. Due to the complex underground environment in which tunneling machines work, the excavated soil discharged by the screw conveyor has a high water content and often contains rocks. Currently, screw conveyors are generally only equipped with one gate, which is at risk of getting stuck by rocks during excavation. Even under ideal conditions without rocks, the pressure on the gate plate from the flowing excavated soil is still relatively high. Under high pressure, the gate may not be able to close completely or in time. In strata with high water content, the inability of the gate to close can cause a surge, which can lead to a certain degree of ground subsidence. The spurted soil and water can flood the tunnel, seriously affecting construction safety. Summary of the Invention

[0003] The purpose of this invention is to provide a method for closing a combined gate. The combined gate closing logic designed in this invention not only reduces the closing force required to completely close the last sub-gate, making the gate easier to close, but also helps to reduce the gate's design cost and increase its service life.

[0004] The technical solution of this invention: A method for closing a combined gate, the combined gate comprising N sub-gates spaced apart sequentially along the fluid flow direction, where N≥2, and each of the N sub-gates can be individually controlled for opening, closing, and degree of opening; taking the position through which the fluid flows first as the front and the position through which it flows last as the back, if the fluid can pass through the last sub-gate, the combined gate is in an open state; if the fluid cannot pass through the last sub-gate, the combined gate is in a closed state; the process of the combined gate transitioning from the open state to the closed state is as follows:

[0005] When the last sub-gate begins to close, there is at least one sub-gate ahead of it.

[0006] The closing action has already been performed and has stopped; or

[0007] In the process of closing; or

[0008] The closing action begins synchronously with the last sub-gate mentioned above.

[0009] Compared with the prior art, the beneficial effects of the present invention are reflected in the following: The combined gate of the present invention includes at least two sub-gates that can be controlled to open and close independently. Each sub-gate of the combined gate has its own closing logic, and all closing logic serves to enable the last sub-gate to be driven with a smaller closing force. Specifically, when the last sub-gate begins to close, it ensures that other sub-gates in front have already closed, are in the process of closing, or have started closing synchronously with the last sub-gate. The closing logic in the above-mentioned various situations can be summarized as follows: before the last sub-gate moves, the preceding sub-gates will "reduce force" for the implementation of the action. When the fluid passes through the preceding sub-gate, a certain pressure drop will be generated (pressure drop refers to the pressure loss caused by the heat generated when the fluid passes through the sub-gate due to turbulence and other phenomena, i.e., pressure reduction). In other words, the preceding sub-gates can effectively block the fluid, share some of the fluid pressure for the closing of the last sub-gate, and make the closing of the last sub-gate slightly easier. The ease with which the sub-gates close is related to the choice of gate specifications. Conventional screw conveyors use only one gate as the opening and closing port, which inevitably requires a high closing force for a single gate. However, this invention uses a method of joint operation of multiple sub-gates, which can reduce the design requirements for the maximum closing force of each sub-gate. Thus, the same closing effect can be achieved with smaller sub-gates, which can effectively reduce the design cost of the gate. At the same time, the service life of smaller sub-gates will also be longer.

[0010] In the aforementioned method for closing the combined gate, in either of the following two cases: at least one of the preceding sub-gates has already closed and has stopped closing, or at least one of the preceding sub-gates is currently closing:

[0011] In the N sub-gates that are distributed at intervals along the direction of fluid flow, the closing time of the previous sub-gate is earlier than the closing time of the next sub-gate.

[0012] In the aforementioned method for closing the combined gate, the time interval between the start of the closing action of any two adjacent sub-gates is equal.

[0013] In the aforementioned method for closing the combined gate, the first sub-gate is closed to a% of its maximum opening, and the second sub-gate is closed to b% of its maximum opening, wherein 1 ≥ a% ≥ b% ≥ 0, and the last sub-gate is completely closed.

[0014] In the aforementioned method for closing the combined gate, the first N-1 sub-gates are all closed to 50%-70% of their maximum opening; or

[0015] For the m-th subgate distributed from front to back along the fluid flow direction, N≥m≥1, it is closed to the maximum opening degree of (Nm) / N.

[0016] In the aforementioned method for closing the combined gate, in the case where at least one of the preceding sub-gates and the last sub-gate begin closing simultaneously:

[0017] The N sub-gates simultaneously begin closing.

[0018] In the aforementioned method for closing the combined gate, the maximum closing force of the N sub-gates is equal.

[0019] In the aforementioned method for closing the combined gate, in the case where at least one of the preceding sub-gates has already been closed and has stopped closing:

[0020] If any of the sub-gates are already completely closed, the last sub-gate will begin closing only after the fluid flow at that point has stopped.

[0021] In the aforementioned method for closing the combined gate, among the N sub-gates distributed from front to back along the fluid flow direction, the interval between the last two sub-gates is greater than the interval between any two adjacent sub-gates in front. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the first gate structure in Embodiment 8 of the present invention;

[0023] Figure 2 This is a cross-sectional view of the first gate structure in Embodiment 8 of the present invention;

[0024] Figure 3 This is a schematic cross-sectional view of the first and second gate structures in Embodiment 8 of the present invention. Figure 1 ;

[0025] Figure 4 This is a schematic diagram of the overall structure of the first gate structure and the second gate structure in Embodiment 8 of the present invention;

[0026] Figure 5 This is a schematic cross-sectional view of the first and second gate structures in Embodiment 8 of the present invention. Figure 2 .

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. First gate structure, 11. First frame, 12. First gate plate, 13. First cylinder, 14. Linkage component, 141. Guide connecting rod, 142. Fixed column, 143. Guide groove, 144. Linkage rod, 15. First channel, 16. First piston rod, 17. First connecting pipe, 18. First connection port, 2. Second gate structure, 20. Second connecting pipe, 200. Second connection port, 2000. Slag removal port, 21. Second frame, 210. First connecting plate, 2100. Second connecting plate, 22. Second gate plate, 23. Second cylinder, 24. Second channel, 25. Second piston rod, 26. Guide plate, 27. Wear-resistant plate, 28. First guide slide, 29. Second guide slide, 3. Pipeline. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0030] Example 1: A method for closing a combined gate, comprising N sub-gates spaced apart sequentially along the fluid flow direction, where N ≥ 2, and each of the N sub-gates can be individually controlled for opening, closing, and degree of opening; taking the position the fluid first flows through as the front and the position it flows through last as the back, if the fluid can pass through the last sub-gate, the combined gate is in the open state; if the fluid cannot pass through the last sub-gate, the combined gate is in the closed state; the process of the combined gate transitioning from the open state to the closed state is as follows:

[0031] When the last sub-gate begins to close, at least one sub-gate ahead has already closed and stopped closing.

[0032] It should be noted that "the sub-gate has been closed" refers to the sub-gate being closed to a certain percentage of its maximum opening, not specifically to the sub-gate being completely closed. If a sub-gate is completely closed, it should be described as the sub-gate being closed to 0% of its maximum opening.

[0033] In this embodiment, the previous sub-gates have already stopped closing when the last sub-gate begins to close, indicating that all sub-gates are stationary for at least a certain period of time. The disadvantage is that it will prolong the total closing time of the combined gates to some extent. The advantage is that the subsequent sub-gates can only be closed after a certain sub-gate has stopped closing. The control logic of the sub-gates is relatively simple and less prone to errors.

[0034] Example 2: A method for closing a combined gate, comprising N sub-gates spaced apart sequentially along the fluid flow direction, where N ≥ 2, and each of the N sub-gates can be individually controlled for opening, closing, and degree of opening; taking the position the fluid first flows through as the front and the position it flows through last as the back, if the fluid can pass through the last sub-gate, the combined gate is in the open state; if the fluid cannot pass through the last sub-gate, the combined gate is in the closed state; during the process of the combined gate transitioning from the open state to the closed state:

[0035] When the last sub-gate begins to close, at least one sub-gate ahead is closing.

[0036] In this embodiment, since the closing time between sub-gates is not too long, when the last sub-gate begins to close, there are already sub-gates in front of it closing. The advantage is that the total closing time of the combined gate can be reduced to some extent. The disadvantage is that the starting time of the sub-gate closing action needs to be strictly calculated, which increases the complexity of the sub-gate control logic to some extent.

[0037] Example 3: A method for closing a combined gate, comprising N sub-gates spaced apart sequentially along the fluid flow direction, where N ≥ 2, and each of the N sub-gates can be individually controlled for opening, closing, and degree of opening; taking the position the fluid first flows through as the front and the position it flows through last as the back, if the fluid can pass through the last sub-gate, the combined gate is in the open state; if the fluid cannot pass through the last sub-gate, the combined gate is in the closed state; during the process of the combined gate transitioning from the open state to the closed state:

[0038] When the last sub-gate begins to close, at least one sub-gate ahead of it will begin to close simultaneously with the last sub-gate.

[0039] In this embodiment, at least two sub-gates start closing simultaneously. The advantage is that the control logic of the sub-gates is relatively simple and can reduce the total closing time of the combined gates to a certain extent. The disadvantage is that the pressure drop generated on the sub-gate that operates synchronously with the last sub-gate is limited, so the maximum closing force required by the last sub-gate will be relatively large.

[0040] Example 4: This example is based on Example 1 or Example 2.

[0041] Optionally, among the N sub-gates distributed sequentially at intervals along the fluid flow direction, the closing time of the previous sub-gate is earlier than the closing time of the next sub-gate.

[0042] In this embodiment, the N sub-gates are closed sequentially from front to back. When the next sub-gate begins to close, it can benefit from some of the fluid pressure shared by the previous sub-gate. In other words, all the sub-gates before the last sub-gate can effectively stop the fluid, making it easier to close the last sub-gate.

[0043] The N sub-gates are closed sequentially from front to back, which also allows the maximum closing force requirement of the N sub-gates to gradually decrease, and the specifications of the sub-gates can be gradually reduced.

[0044] Optionally, the time interval between the start of the closing action of any two adjacent sub-gates is equal.

[0045] In this embodiment, the start time of the closing action of each subgate is fixed, which simplifies the control logic of the subgate. Generally, the start time of the closing action of two adjacent subgates is 1s-2s, preferably 1.5s.

[0046] Optionally, for the m-th subgate distributed from front to back along the fluid flow direction, N≥m≥1, it is closed to (Nm) / N of the maximum opening, and the last subgate is completely closed.

[0047] In this embodiment, the closing amount of each sub-gate is also fixed, which makes the pressure drop generated on each sub-gate more uniform, so that the last sub-gate can be completely closed with the least effort.

[0048] Preferably, the number of sub-gates N=3. That is, for the three sub-gates distributed from front to back along the fluid flow direction, the first sub-gate is closed to 2 / 3 of its maximum opening, the second sub-gate is closed to 1 / 3 of its maximum opening, and the third sub-gate is completely closed.

[0049] Example 5: This example is based on Example 1 or Example 2.

[0050] Optionally, among the N sub-gates distributed sequentially at intervals along the fluid flow direction, the closing time of the previous sub-gate is earlier than the closing time of the next sub-gate.

[0051] In this embodiment, the N sub-gates are closed sequentially from front to back. When the next sub-gate begins to close, it can benefit from some of the fluid pressure shared by the previous sub-gate. In other words, all the sub-gates before the last sub-gate can effectively stop the fluid, making it easier to close the last sub-gate.

[0052] The N sub-gates are closed sequentially from front to back, which also allows the maximum closing force requirement of the N sub-gates to gradually decrease, and the specifications of the sub-gates can be gradually reduced.

[0053] Optionally, the time interval between the start of the closing action of any two adjacent sub-gates is equal.

[0054] In this embodiment, the start time of the closing action of each subgate is fixed, which simplifies the control logic of the subgate. Generally, the start time of the closing action of two adjacent subgates is 1s-2s, preferably 1.5s.

[0055] Optionally, the first N-1 sub-gates are all closed to 50%-70% of their maximum opening, and the last sub-gate is completely closed.

[0056] In this embodiment, although it is not possible to achieve the same effortless complete closure of the last sub-gate as in Embodiment 4, closing all other sub-gates before the last sub-gate to the same extent can standardize the specifications of the other sub-gates. This can reduce costs and facilitate replacement and maintenance when a sub-gate malfunctions.

[0057] Preferably, the number of subgates N=3. Among the three subgates distributed from front to back along the fluid flow direction, the first and second subgates are both closed to 60% of their maximum opening, and the third subgate is completely closed.

[0058] Example 6: This example is based on Example 3.

[0059] Optionally, the N sub-gates may simultaneously begin closing.

[0060] In this embodiment, the simplest control logic is to have N sub-gates simultaneously begin closing, which allows the combined gates to switch from the open state to the closed state in the shortest possible time.

[0061] Optionally, the maximum closing force of the N sub-gates is equal.

[0062] In this embodiment, the N sub-gates are all of the same specification, which can reduce costs and facilitate replacement and maintenance when the sub-gates malfunction.

[0063] It should be noted that the simultaneous closing of N sub-gates does not mean that the closing of the last sub-gate requires the same high closing force as a conventional single gate. Even if all sub-gates are closed simultaneously, the fluid flow takes time, and the preceding sub-gates can still share a small amount of fluid pressure with the following sub-gates. Therefore, the maximum closing force required for the last sub-gate will be greater than that of the other embodiments mentioned above, but still less than that of a conventional single gate.

[0064] Example 7: This example is based on Example 1.

[0065] Optionally, if a sub-gate is already completely closed, the last sub-gate will begin closing only after the fluid flow at that point has stopped.

[0066] In this embodiment, the combined gate can be used as a barrier valve for pipeline maintenance. Generally, the sub-gate before the last sub-gate is also completely closed. Therefore, the gap between the last two sub-gates can be used as a cleaning hole and to buffer pressure. After the fluid in the cleaning hole is drained, the last sub-gate is closed to facilitate pipeline maintenance.

[0067] Optionally, among the N sub-gates distributed from front to back along the fluid flow direction, the interval between the last two sub-gates is greater than the interval between any two adjacent sub-gates in front. In this case, the combined gate is used as a barrier valve for pipeline maintenance. The last two sub-gates are installed at both ends of the pipeline, that is, the interval between the last two gates is much greater than the interval between any other two adjacent gates.

[0068] In this embodiment, after the fluid in the pipeline is drained, the last sub-gate is closed, and then the pipeline is inspected and repaired.

[0069] Example 8: This example is based on any of the above examples. In this example, the specific structure of the sub-gate is described by way of example. All sub-gates can be selected from either the first gate structure 1 or the second gate structure 2.

[0070] For ease of description, in this embodiment, the number of sub-gates is N=2, and the two sub-gates have different structures. That is, a first gate structure 1 and a second gate structure 2 are selected for exemplary description. The first gate structure 1 is used to connect to the pipeline 3.

[0071] See Figures 1-5The first gate structure 1 includes a first frame 11, a first gate plate 12, and a first driving device. The first frame 11 is a square frame with an opening in the middle. The pipe 3 is used to connect with the opening of the first frame 11. The first driving device is used to drive the first gate plate 12 to move vertically to block or open the opening of the first frame 11. The second gate structure 2 is connected to the side of the first gate structure 1 away from the pipe 3. The second gate structure 2 includes a second frame 21, a second gate plate 22, and a first driving device. The second frame 21 is a square frame with an opening in the middle. The opening of the second frame 21 is used to connect with the opening of the first frame 11. The second driving device is used to drive the second gate plate 22 to move vertically to block or open the opening of the second frame 21.

[0072] In this embodiment, slag discharge is controlled by opening and closing gates. When closing the opening structure of the first frame 11, the first driving device is activated to drive the first gate plate 12 to move vertically downwards, thereby causing the first gate plate 12 to move towards the inner bottom of the first frame 11 to close and prevent slurry from spraying out of the pipe 3. When closing the opening structure of the second frame 211, the second driving device is activated to drive the second gate plate 22 to move vertically downwards, thereby causing the second gate plate 22 to move towards the inner bottom of the second frame 21 to close and prevent slurry from spraying out of the pipe 3. The two gate structures can be used simultaneously or individually. On the one hand, this ensures safety, meaning that if one gate fails, the other gate will still function. On the other hand, when the two gate structures are used simultaneously, the passive force pressure on the gate plates can be gradually reduced during the gate closing process, ensuring that the last gate structure can close normally and avoiding the problem of slurry spraying and flooding the tunnel, thus improving construction safety.

[0073] Preferably, the first driving device includes a first hydraulic cylinder 13 and a first linkage 14. Two first hydraulic cylinders 13 are symmetrically arranged at both ends of the first frame 11, and the first piston rod 16 of the first hydraulic cylinder 13 is arranged downward. The linkage 14 is arranged on the first frame 11 and located between the first hydraulic cylinder 13 and the first gate plate 12. The upper end of the linkage 14 is used to connect with the upper end of the first gate plate 12, and the lower end of the linkage 14 is used to connect with the lower end of the first piston rod 16 of the first hydraulic cylinder 13.

[0074] Preferably, a first channel 15 is provided in the first frame 11 along the vertical direction, and the first gate plate 12 is used to move in the first channel 15 along the vertical direction to block or open the opening structure of the first frame 11.

[0075] Specifically, the combined gate also includes a first mounting base, with two first mounting bases respectively installed on the upper parts of both ends of the first frame 11, and a first hydraulic cylinder 13 installed on the first mounting base so that the first piston rod 16 is set downwards.

[0076] In this embodiment, slag discharge is controlled by opening and closing the gate. When the opening structure of the first frame 11 is closed, the first hydraulic cylinder 13 is activated. Since the first piston rod 16 of the first hydraulic cylinder 13 is positioned downwards, the upper end of the linkage 14 is used to connect with the upper end of the first gate plate 12, and the lower end of the linkage 14 is used to connect with the lower end of the first piston rod 16 of the first hydraulic cylinder 13. When the first hydraulic cylinder 13 operates to drive the first piston rod 16 downwards, the linkage 14 drives the first gate plate 12 to move downwards along the first channel 15, thereby causing the first gate plate 12 to move towards the inner bottom of the first frame 11 to close and prevent slurry from spraying out of the pipe 3. The first piston rod 16 of the first hydraulic cylinder 13 is positioned downwards. The first gate plate 12 is equipped with two first hydraulic cylinders 13 symmetrically arranged at both ends of the first frame 11. These cylinders drive the first piston rod 16 to extend downwards and apply thrust, providing sufficient power for the first gate plate 12 to close the opening structure of the first frame 11. This ensures adequate driving force and good driving guidance, allowing the first gate plate 12 to squeeze out stones or soil clods inside the first frame 11 when closing the opening structure. This ensures the smooth closure of the first gate plate 12 and avoids the problem of mud slurry flooding the tunnel, thus improving construction safety. At the same time, this structure can also reduce the overall space occupied by the first gate structure 1, resulting in a reasonable layout.

[0077] The first gate structure 1 can be provided in multiple sets, and multiple sets of the first gate structure 1 can be connected to one end of the pipeline 3 in sequence.

[0078] See Figure 1 Preferably, the linkage 14 includes a guide connecting rod 141, a linkage rod 144, and a fixed column 142 fixed on the first frame 11. The fixed column 142 has a guide groove 143 running vertically through its interior. The guide connecting rod 141 is used to pass through the guide groove 143 and slide vertically relative to the guide groove 143.

[0079] Specifically, the cross-section of the guide connecting rod 141 can be rectangular, polygonal, circular, or a combination thereof. Correspondingly, the cross-sectional shape of the guide groove 143 can also be rectangular, polygonal, circular, or a combination thereof. The cross-sectional shape of the guide groove 143 matches the cross-sectional shape of the guide connecting rod 141.

[0080] In this embodiment, when the first cylinder 13 is working, the first piston rod 16 moves, driving the guide connecting rod 141 to move along the guide groove 143. The guide connecting rod 141 is provided to connect the first gate plate 12 and the first piston rod 16, so that the first gate plate 12 can follow the first piston rod 16. The fixed column 142 and the guide groove 143 enable the first gate plate 12 to move to a suitable position when moving, avoiding the problem of jamming caused by positional deviation.

[0081] In other embodiments, the linkage 14 can also be a guide connecting rod 141 and a guide block cooperating. The guide block is fixed on the first frame 11, and a guide groove is provided on the side of the guide connecting rod 141 facing the guide block. The guide block moves in the guide groove so that when the guide connecting rod 141 moves, the guide block moves in the guide groove to ensure that the guide connecting rod 141 does not shift its position. Alternatively, the guide block is fixed on the guide connecting rod 141, and the guide groove is provided on the side wall of the first frame 11, which can also achieve the same effect.

[0082] Preferably, the upper end of the guide connecting rod 141 is used to connect with the upper end of the first gate plate 12, and the lower end of the guide connecting rod 141 and the lower end of the first piston rod 16 are both connected to the linkage rod 144.

[0083] Specifically, the lower ends of the two first piston rods 16 and the two guide connecting rods 141 are all connected to the same linkage rod 144.

[0084] In this embodiment, the linkage rod 144 is used to connect the guide connecting rod 141 and the first piston rod 16, which helps the guide connecting rod 141 to move synchronously with the first piston rod 16, thereby ensuring the movement of the first gate plate 12.

[0085] In other embodiments, there may be two linkage rods 144. The lower end of the first piston rod 16 at one end of the first frame 11 and the lower end of the guide connecting rod 141 are connected by one linkage rod 144, and the lower end of the first piston rod 16 at the other end and the lower end of the guide connecting rod 141 are connected by the other linkage rod 144. In this structure, the two first oil cylinders 13 work synchronously at the same time, and the two linkage rods 144 can also synchronously drive the two guide connecting rods 141 to move, thereby driving the first gate plate 12 to move.

[0086] Preferably, the lower ends of the first gate plate 12 and the lower ends of the second gate plate 22 are both blade-shaped structures.

[0087] In this embodiment, the lower ends of the first gate plate 12 and the second gate plate 22 are both blade-shaped structures. This allows the first gate plate 12 to cut or squeeze out the stones or soil clods inside the first frame 11 when closing the opening structure of the first frame 11, ensuring that the first gate plate 12 can close smoothly. Similarly, it allows the second gate plate 22 to cut or squeeze out the stones or soil clods inside the second frame 21 when closing the opening structure of the second frame 21, thereby avoiding the problem of mud slurry flooding the tunnel and improving construction safety.

[0088] See Figures 3-4 Preferably, the second driving device includes a second hydraulic cylinder 23. The two ends of the second frame 21 are symmetrically provided with the second hydraulic cylinder 23. The second piston rod 25 of the second hydraulic cylinder 23 is arranged upward, and the upper end of the second piston rod 25 is used to connect with the upper end of the second gate plate 22.

[0089] Specifically, the first gate structure 1 can be set up independently. Alternatively, the second gate structure 2 can be implemented in conjunction with the first gate structure 1. In this case, the second gate structure 2 can be used as a regular gate, and the first gate structure 1 can be used as a backup gate. When the second gate structure 2 malfunctions, such as being unable to close, or in the event of an emergency, such as soil gushing outwards due to excessive pressure in the soil chamber, requiring manual intervention to close the gate, the first gate structure 1 and the second gate structure 2 can be interlocked using displacement sensors or proximity switches. That is, if the displacement sensor does not detect the second gate structure 2 closing within a certain set time, the first gate structure 1 will automatically close.

[0090] The combined gate also includes a second mounting base. The two second mounting bases are respectively installed at the lower ends of the second frame 21. The second hydraulic cylinder 23 is used to be installed on the second mounting base so that the second piston rod 25 is set upward.

[0091] Preferably, a second channel 24 is provided in the second frame 21 along the vertical direction, and the second gate plate 22 is used to move in the second channel 24 along the vertical direction to block or open the opening structure of the second frame 21.

[0092] In this embodiment, when the second gate structure 2 is opened, the second hydraulic cylinder 23 is activated. Since the second piston rod 25 of the second hydraulic cylinder 23 is positioned upwards, and the upper end of the second piston rod 25 is connected to the upper end of the second gate plate 22, the second hydraulic cylinder 23 operates to drive the second piston rod 25 upwards, thereby driving the second gate plate 22 to move upwards along the second channel 24 and opening the second gate plate 22. When it is necessary to close the second gate structure 2, the second hydraulic cylinder 23 is activated to drive the second piston rod 25 downwards, thereby driving the second gate plate 22 to move downwards along the second channel 24, thereby causing the second gate plate 22 to move towards the inner bottom of the second frame 21 to close, so as to prevent mud from spraying out of the pipe 3 and to avoid the problem of mud gushing out and flooding the tunnel.

[0093] The second gate structure 2 can be provided in multiple sets, and the multiple sets of second gate structures 2 can be connected in sequence to the end of the first gate structure 1 away from the pipeline 3.

[0094] Lubrication holes are provided on both the first frame 11 and the second frame 21. The lubrication hole on the first frame 11 is connected to the first channel 15, and the lubrication hole on the second frame 21 is connected to the second channel 24. Both lubrication holes are provided with oil nozzles, which can inject lubricating oil into the first channel 15 and the second channel 24 through the oil nozzles and lubrication holes, thereby reducing the friction between the first gate plate 12 and the first frame 11, and between the second gate plate 22 and the second frame 21, so that the first gate plate 12 and the second gate plate 22 close more smoothly.

[0095] See Figures 4-5 Preferably, the second gate structure 2 further includes a guide plate 26. The upper end of the second frame 21 is provided with two guide plates 26 on both sides of the second channel 24. The inner walls of the two guide plates 26 are provided with wear-resistant plates 27. A first guide slide 28 connected to the second channel 24 is provided between the two wear-resistant plates 27. The second gate plate 22 moves within the first guide slide 28 and the second channel 24.

[0096] Specifically, the guide plate 26 is located at the upper middle position of the second frame 21, and the width of the guide plate 26 is smaller than the width of the second frame 21. When the second gate plate 22 closes the second frame 21, the second gate plate 22 is located in the second channel 24. When the second gate plate 22 opens, the second gate plate 22 is located in the first guide slide 28.

[0097] In this embodiment, the guide plate 26 and the wear-resistant plate 27 are arranged to form a first guide slide 28. The first guide slide 28 has a guiding function to prevent the second gate plate 22 from shifting position when moving. The wear-resistant plate 27 helps to reduce sliding resistance, thereby increasing the effective force of the second cylinder 23.

[0098] See Figures 4-5 Preferably, the second gate structure 2 further includes a first connecting plate 210 and a second connecting plate 2100, which are located at both ends of the second gate plate 22 and are used to connect the upper ends of the two second piston rods 25 to both ends of the second gate plate 22.

[0099] In this embodiment, the first connecting plate 210 and the second connecting plate 2100 are used to connect the second gate plate 22 to the second piston rod 25 of the second oil cylinder 23 to ensure the stability of the connection between the second gate plate 22 and the second piston rod 25.

[0100] See Figures 4-5 Preferably, a second guide slide 29 is formed between the first connecting plate 210 and the second connecting plate 2100. When the second gate plate 22 moves within the first guide slide 28, the guide plate 26 and the wear-resistant plate 27 are located within the second guide slide 29 and slide relative to the second guide slide 29.

[0101] In this embodiment, the second guide slide 29 has a guiding function and is used to move within the second guide slide 29 by the guide plate 26 and the wear-resistant plate 27, which helps to further prevent the second gate plate 22 from shifting position during movement.

[0102] See Figures 4-5 Preferably, the first gate structure 1 further includes a first connecting pipe 17, the opening structure on the first frame 11 is a first connecting port 18, the first connecting pipe 17 is fixed to one side of the first frame 11 and connected to the first connecting port 18, and the end of the first connecting pipe 17 away from the first frame 11 is used to connect to the pipe 3; the second gate structure 2 further includes a second connecting pipe 20, the opening structure on the second frame 21 is a second connecting port 200, the second connecting pipe 20 is fixed to one side of the second frame 21 and connected to the second connecting port 200, and the end of the second connecting pipe 20 away from the second connecting port 200 is connected to the first connecting port 18.

[0103] Specifically, the first connecting pipe 17, the first connecting port 18, the second connecting pipe 20, and the second connecting port 200 are connected in sequence.

[0104] In this embodiment, when the first gate plate 12 is closed, it closes the first connection port 18 on the first frame 11, and when the second gate plate 22 is closed, it closes the second connection port 200 on the second frame 21.

[0105] See Figure 5 Preferably, the lower end of the second connecting pipe 20 is also provided with a slag cleaning port 2000, and the slag cleaning port 2000 is connected to a slag cleaning pipe 3.

[0106] In this embodiment, when excessive deposits inside the first frame 11, the second frame 21, and the second connecting pipe 20 cause blockage, they can be cleaned through the slag removal port 2000.

[0107] See Figure 5 Preferably, the axis of the second connecting pipe 20 gradually slopes downward in a direction away from the first frame 11, so that the axis of the second connecting pipe 20 forms an acute angle with the horizontal line.

[0108] In this embodiment, the axis of the second connecting pipe 20 gradually tilts downwards in a direction away from the first frame 11, and the acute angle setting helps to discharge mud and prevents mud from lingering in the second connecting pipe 20 and the second frame 21.

[0109] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

[0110] In the description of this embodiment, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0111] It should be noted that in the XYZ coordinate system provided in this article, the positive direction of the X-axis represents the right, and the negative direction of the X-axis represents the left; the positive direction of the Y-axis represents the front, and the negative direction of the Y-axis represents the back; the positive direction of the Z-axis represents the top, and the negative direction of the Z-axis represents the bottom. The meanings of the Z-axis, X-axis, and Y-axis are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

Claims

1. A method for closing a combined gate, wherein the combined gate is sealed and connected to a pipeline, characterized in that, The combined gate includes N sub-gates spaced at intervals along the fluid flow direction, where N ≥ 2. Each of the N sub-gates can be individually controlled for opening, closing, and degree of opening. Taking the position the fluid first passes through as the "front" and the position it passes through last as the "rear," the combined gate is open if the fluid can pass through the last sub-gate, and closed if the fluid cannot pass through the last sub-gate. The process of the combined gate transitioning from the open to the closed state is as follows: When the last sub-gate begins to close, at least one of the preceding sub-gates has already closed and stopped closing; or is closing; or begins to close synchronously with the last sub-gate. In the two cases where at least one of the preceding subgates has already closed and has stopped closing, or where at least one of the preceding subgates is currently closing: among the N subgates distributed sequentially at intervals along the fluid flow direction, the starting time of the closing action of the preceding subgate is earlier than the starting time of the closing action of the following subgate; In the case where at least one of the sub-gates ahead has already closed and stopped closing: if there is a sub-gate that has been completely closed, the last sub-gate will start closing again after the fluid stops flowing at that location; and when N>2, the distance between the last two sub-gates is greater than the distance between any two adjacent sub-gates ahead.

2. The closing method of the combined gate according to claim 1, characterized in that, The time interval between the start of the closing action of any two adjacent sub-gates is equal.

3. The closing method of the combined gate according to claim 1 or 2, characterized in that, The first subgate is closed to a% of its maximum opening, and the second subgate is closed to b% of its maximum opening, wherein 1 ≥ a% ≥ b% ≥ 0, and the last subgate is completely closed.

4. The closing method of the combined gate according to claim 3, characterized in that, Close all the sub-gates of the first N-1 channels to 50%-70% of their maximum opening.

5. The closing method of the combined gate according to claim 3, characterized in that, For the m-th subgate distributed from front to back along the fluid flow direction, N≥m≥1, it is closed to the maximum opening degree of (Nm) / N.

6. The closing method of the combined gate according to claim 1, characterized in that, In the case where at least one of the preceding sub-gates begins closing simultaneously with the last sub-gate: The N sub-gates simultaneously begin closing.

7. The closing method of the combined gate according to claim 6, characterized in that, The maximum closing force of the N sub-gates is equal.

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