Spring hydraulic operating mechanism

Abstract

This embodiment provides a spring-hydraulic operating mechanism, including: a working cylinder assembly; an energy storage cylinder, sleeved on the outside of the working cylinder assembly and capable of moving up and down along the working cylinder assembly; a disc spring assembly connected to the energy storage cylinder, the disc spring assembly including a flange and multiple disc springs stacked along the height direction of the working cylinder assembly, the flange sleeved on the outside of the energy storage cylinder and fixed to the top of the disc springs; and a guide device, including a guide rod and a guide seat, the bottom end of the guide rod being fixed to the flange, the guide seat being fixed to the working cylinder assembly, the guide seat having a through hole, the guide rod passing through the through hole and capable of moving up and down within the through hole. By setting a guide device to connect the flange and the working cylinder assembly, it is possible to prevent the flange from deflecting at a certain angle relative to the working cylinder assembly during up and down movement, thus preventing inaccurate distance measurement by the limit switches and safety valves installed on the flange due to flange deflection, and improving the accuracy of distance measurement.

Description

Technical Field

[0001] This invention relates to the field of operating mechanisms for high-voltage switches, and more specifically to a spring-hydraulic operating mechanism. Background Technology

[0002] In existing high-voltage lines, the operating mechanisms for opening and closing circuit breakers are mostly spring-hydraulic mechanisms. These mechanisms include a working cylinder, a piston rod inside the working cylinder, an energy storage cylinder surrounding the working cylinder, a flange and a disc spring located below the energy storage cylinder. High-pressure oil enters the energy storage cylinder through an oil storage channel within the working cylinder and an oil passage on the side wall of the working cylinder, causing the energy storage cylinder to move downwards, compressing the flange and disc spring to store energy. When energy needs to be released, the disc spring extends, and high-pressure oil from the energy storage cylinder enters the working cylinder through the oil passage, causing the piston rod to extend out of the working cylinder for opening or retract into the working cylinder for closing. During energy storage and release, the flange connected above the disc spring moves with the compression or extension of the disc spring. This movement inevitably causes some deflection, which can lead to inaccurate distance measurement by limit switches and safety valves mounted on the flange, affecting product performance. In cases of significant flange deflection, the connection between the limit switches / safety valves and the flange or working cylinder may even be damaged. Summary of the Invention

[0003] Therefore, the purpose of this invention is to provide a spring-hydraulic operating mechanism to at least solve the problem that the flange connected above the disc spring moves with the compression or extension of the disc spring, and a certain deflection occurs during the movement.

[0004] A first aspect of the present invention provides a spring-hydraulic operating mechanism, comprising: a working cylinder assembly; an energy storage cylinder sleeved on the outside of the working cylinder assembly and capable of moving up and down along the working cylinder assembly; a disc spring assembly connected to the energy storage cylinder, the disc spring assembly including a flange and a plurality of disc springs stacked along the height direction of the working cylinder assembly, the flange sleeved on the outside of the energy storage cylinder and fixed to the top of the disc springs; and a guide device including a guide rod and a guide seat, the bottom end of the guide rod being fixed to the flange, the guide seat being fixed to the working cylinder assembly, the guide seat having a through hole, the guide rod passing through the through hole and capable of moving up and down within the through hole.

[0005] In addition, the spring-hydraulic operating mechanism provided in the above embodiments of the present invention may also have the following additional technical features:

[0006] In some embodiments, the spring-hydraulic operating mechanism further includes: a limit switch disposed on the working cylinder assembly, the limit switch being capable of detecting the movement distance of the flange, and a portion of the limit switch being connected to the flange; and a safety valve disposed on the working cylinder assembly, the safety valve including a rod being connected to the flange, the safety valve being capable of detecting the movement distance of the flange to detect the compression stroke of the disc spring, and the safety valve being capable of releasing pressure if the compression stroke of the disc spring exceeds a safety value.

[0007] In some embodiments, the spring hydraulic operating mechanism further includes: a mounting base fixed to the top surface of the flange, the bottom end of the rod fixed to the mounting base, and the bottom end of the guide rod fixed to the mounting base.

[0008] In some embodiments, the mounting base includes: a right-angle plate, which includes a first connecting plate and a second connecting plate connected to each other. The end of the first connecting plate away from the second connecting plate is provided with a fixing hole adapted to a guide rod. The guide rod passes through the fixing hole and is fixedly connected to the right-angle plate by a first fastener; a first fixing plate, which is located below the second connecting plate. The first fixing plate is provided with a plurality of first fastening holes and at least one assembly hole. The assembly hole is adapted to a rod body. The rod body passes through the assembly hole and is fixedly connected to the rod body and the first fixing plate by a second fastener; a second fixing plate, which is located below the first fixing plate. The second fixing plate is provided with a plurality of second fastening holes and a plurality of third fastening holes. The plurality of first fastening holes, the plurality of second fastening holes, and the plurality of third fastening holes correspond one-to-one, and the third fastener passes through the plurality of first fastening holes, the plurality of second fastening holes, and the plurality of third fastening holes to mount the mounting base on the flange.

[0009] In some embodiments, the guide seat includes: a seat body having a mounting hole extending in a vertical direction, the outer side wall of the seat body being fixed to the working cylinder assembly; and a bushing disposed in the mounting hole, the bushing having a through hole.

[0010] In some embodiments, the hardness of the bushing is less than that of the guide rod; the gap between the through hole and the guide rod ranges from 0 mm to 0.05 mm.

[0011] In some embodiments, the working cylinder assembly includes: a working cylinder body having an oil storage channel inside, an oil passage hole communicating with the oil storage channel being provided on the outer side wall of the working cylinder body, and an energy storage cylinder sleeve being disposed on the outer side of the working cylinder body; an oil pump motor bracket being fixedly connected to the working cylinder body; an oil storage tank being fixedly connected to the working cylinder body; and a guide seat being fixedly connected to any one of the working cylinder body, the oil pump motor bracket, and the oil storage tank.

[0012] In some embodiments, the guide seat is fixedly connected to the side wall of the working cylinder body; the seat body is provided with a plurality of mounting holes, the side wall of the working cylinder body is provided with a plurality of mating holes, and the spring hydraulic operating mechanism further includes a plurality of fourth fasteners, which pass through the mounting holes one by one and are locked in the mating holes.

[0013] In some embodiments, the spring hydraulic operating mechanism further includes: an oil pump mounted on an oil pump motor bracket, the oil pump inlet being connected to the first oil outlet of an oil storage tank, the oil pump outlet being connected to an oil storage channel, and the oil pump being able to pump high-pressure oil into the oil storage channel; a limit switch connected to a disc spring assembly, the limit switch being able to detect the deformation height of the disc spring assembly, and controlling the oil pump to start when the disc spring assembly deforms to a first set height, and controlling the oil pump to shut down when the disc spring assembly deforms to a second set height; wherein, the energy storage cylinder is able to move along the working cylinder body under the pressure of the high-pressure oil inside it.

[0014] In some embodiments, the spring-hydraulic operating mechanism includes: a piston rod movably disposed in the working chamber of the working cylinder body, the piston rod having a plug portion at one end near the bottom of the working chamber, a cavity above the plug portion in the working chamber being a high-pressure oil chamber connected to an oil storage channel, and a cavity below the plug portion in the working chamber being a switching oil chamber; and a control valve assembly, which is used to control the piston rod to move upward under the pressure of the high-pressure oil in the switching oil chamber to perform a closing operation, and also to control the piston rod to move downward under the pressure of the high-pressure oil in the high-pressure oil chamber to perform a opening operation.

[0015] In some embodiments, the control valve assembly includes: a control valve, the control valve including a valve body and a valve stem movably disposed within the valve body, the valve body having a high-pressure oil port, a low-pressure oil port, and a switching valve port, the high-pressure oil port being connected to a high-pressure oil chamber, the low-pressure oil port being connected to a second oil outlet of an oil reservoir, and the switching valve port being connected to a switching oil chamber; and a gate valve, which, when opened, controls the valve stem to move to a first predetermined position within the valve body, the high-pressure oil port being connected to the switching valve port via the valve body cavity, and the piston rod shifting... The high-pressure oil in the oil chamber moves upward under the action of the closing oil to perform the closing operation; the self-defense delay valve, when the closing valve is open, the high-pressure oil in the valve body can enter the delay channel of the self-defense delay valve, push up the valve core of the self-defense delay valve to open the self-defense delay valve; the opening valve, when the opening valve is open, the opening valve can control the valve stem to move to the second set position in the valve body while the self-defense delay valve is open, the low-pressure oil valve port is connected to the changing valve port through the valve body cavity, and the piston rod moves downward under the action of the high-pressure oil in the high-pressure oil chamber to perform the opening operation.

[0016] The spring-hydraulic operating mechanism provided in this embodiment of the invention uses a guide rod connected to a flange via a guide device. The guide seat of the guide device is connected to the working cylinder assembly. The guide rod passes through a through hole in the guide seat. During the compression and extension of the disc spring, which drives the flange to move up and down relative to the working cylinder assembly, the guide rod moves up and down with the flange within the through hole of the guide seat. Furthermore, the guide seat restricts the movement of the guide rod on the horizontal plane, thus preventing the flange from rotating relative to the working cylinder assembly. By using a guide device to connect the flange and the working cylinder assembly, on the one hand, since the limit switch and safety valve use the flange as a reference when measuring distance, it prevents the flange from deflecting at a certain angle relative to the working cylinder assembly during its up-and-down movement. This prevents inaccurate distance measurement by the limit switch and safety valve mounted on the flange due to flange deflection, improving the accuracy of distance measurement and enhancing product performance. On the other hand, it also avoids damage to the connection between the limit switch / safety valve and the flange or working cylinder assembly due to flange deflection.

[0017] Further aspects and / or advantages of the general concept of the invention will be set forth in part in the description which follows, and in part will be obvious from the description or may be learned by practice of the general concept of the invention. Attached Figure Description

[0018] The above and other objects and features of the present invention will become clearer from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0019] Figure 1 A cross-sectional schematic diagram of a guide device according to an embodiment of the present invention is shown;

[0020] Figure 2 A left view of a guide device according to an embodiment of the present invention is shown;

[0021] Figure 3 A cross-sectional schematic diagram of a spring-hydraulic operating mechanism according to an embodiment of the present invention is shown, which can also illustrate a guiding device;

[0022] Figure 4 An exploded view of a mounting base according to an embodiment of the present invention is shown;

[0023] Figure 5 A cross-sectional schematic diagram of a spring-hydraulic operating mechanism according to an embodiment of the present invention is shown when the energy storage cylinder is at the upper limit position of the working cylinder.

[0024] Figure 6 A cross-sectional schematic diagram of a spring-hydraulic operating mechanism according to an embodiment of the present invention is shown when the energy storage cylinder is at the lower limit position of the working cylinder.

[0025] Figure 7 A schematic diagram illustrating the working principle of a high-voltage switch assembly in the closed state according to an embodiment of the present invention is shown.

[0026] Figure 8 A schematic diagram illustrating the working principle of a high-voltage switch assembly in the open state according to an embodiment of the present invention is shown.

[0027] Figures 1 to 8 Explanation of icon numbers:

[0028] 10 Working cylinder body, 110 Oil reservoir, 120 Oil passage, 160 High-pressure oil chamber, 170 Changing oil chamber, 180 Piston rod, 181 Plug body.

[0029] 20 energy storage cylinders

[0030] 30 disc spring assembly, 310 flange, 320 disc spring.

[0031] 40 Guide device, 410 Guide rod, 420 Guide seat, 421 Seat body, 422 Bushing, 423 Through hole, 424 Mounting hole, 425 Fourth fastener

[0032] 50 Mounting base, 510 Right-angle plate, 511 First connecting plate, 5111 Fixing hole, 512 Second connecting plate, 5121 Third fastening hole, 520 First fixing plate, 5201 First fastening hole, 5202 Assembly hole, 530 Second fixing plate, 5301 Second fastening hole

[0033] 610 oil pump motor bracket, 620 oil reservoir, 630 oil pump.

[0034] 710 Limit Switch, 720 Safety Valve, 721 Rod,

[0035] 80 Control valve assembly, 810 Control valve, 811 Valve body, 812 Valve stem, 813 High-pressure oil valve port, 814 Low-pressure oil valve port, 815 Switching valve port, 820 Closing valve, 830 Opening valve, 840 Self-defense delay valve, 841 Delay channel, 842 Valve core, a Oil circuit 1, b Oil circuit 2, c Oil circuit 3, d Oil circuit 4, e Oil circuit 5. Detailed Implementation

[0036] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to those orders set forth herein, but may be changed as will become clear upon understanding this disclosure, except for operations that must occur in a specific order. Furthermore, for clarity and conciseness, descriptions of features known in the art may be omitted.

[0037] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein, which will become clear upon understanding the disclosure of this application.

[0038] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more.

[0039] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts should not be limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Thus, without departing from the teaching of the examples described herein, the first component, first assembly, first region, first layer, or first part referred to as the first component, first assembly, first region, first layer, or first part may also be referred to as the second component, second assembly, second region, second layer, or second part.

[0040] In the specification, when an element such as a layer, region, or substrate is described as being "on" another element, "connected to," or "bonded to" another element, the element may be directly "on" another element, directly "connected to," or "bonded to" the other element, or one or more other elements may be present in between. Conversely, when an element is described as being "directly on" another element, "directly connected to," or "directly bonded to" another element, no other elements may be present in between.

[0041] The terminology used herein is for the purpose of describing various examples only and is not intended to limit disclosure. Unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the described features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof. The term “a plurality” represents any quantity of two or more.

[0042] In this application, the directional terms such as "above", "below", "top" and "bottom" are defined based on the direction of movement of the piston rod 180, unless otherwise specified and the direction in the figure is taken as the reference. The direction of movement of the piston rod 180 extending out of the working cylinder body 10 is considered "above", and the direction of movement of the piston rod 180 retracting into the working cylinder body 10 is considered "below". The upper part of each component is the top, and the lower part of each component is the bottom, and it is not limited by the orientation of the operating mechanism.

[0043] Unless otherwise defined, all terms used herein, including technical and scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains upon understanding the invention. Unless expressly defined herein, terms such as those defined in a general dictionary shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and in this invention, and shall not be interpreted in an idealized or overly formalistic manner.

[0044] The following will combine Figures 1 to 8 The present invention describes a spring-hydraulic operating mechanism provided by an embodiment of the present invention.

[0045] like Figure 3 , Figure 5 and Figure 6 As shown, the working cylinder body 10 has an oil storage channel 110 inside, and an oil passage hole 120 communicating with the oil storage channel 110 is provided on the outer side wall of the working cylinder body 10. The oil storage channel 110 is located inside the working cylinder body 10, which can hide the oil storage channel 110 and protect it with the working cylinder body 10. On the other hand, it facilitates the connection between the oil storage channel 110 and other working oil chambers inside the working cylinder body 10. This allows the high-pressure oil in the energy storage cylinder 20 to enter other working oil chambers inside the working cylinder body 10 through the oil passage hole 120 and the oil storage channel 110 when the disc spring assembly 30 releases energy. This promotes the piston rod 180 inside the working cylinder body 10 to extend out of the working cylinder body 10 to perform the opening action or retract into the working cylinder body 10 to perform the closing action under the pressure of the high-pressure oil in the other working oil chambers.

[0046] like Figure 5 and Figure 6 As shown, the energy storage cylinder 20 is sleeved on the outside of the working cylinder body 10 and can move up and down along the working cylinder body 10. The energy storage cylinder 20 includes a side wall and a bottom wall located inside the bottom of the side wall. An energy storage cavity for storing high-pressure oil is formed between the side wall, the bottom wall, and the outer wall of the working cylinder body 10. An insertion hole for the working cylinder body 10 to pass through is provided on the bottom wall of the energy storage cylinder 20. During the up and down movement of the energy storage cylinder 20 relative to the working cylinder body 10, the insertion hole moves along the outer wall of the working cylinder body 10. To ensure sealing, the gap between the inner wall of the insertion hole and the outer wall of the working cylinder body 10 is usually designed to be extremely small, or even a sealing structure is added to prevent the high-pressure oil in the energy storage cavity from leaking out.

[0047] The disc spring assembly 30 is connected to the energy storage cylinder 20 and can store energy as the energy storage cylinder 20 moves downward. The disc spring assembly 30 includes a flange 310 and multiple disc springs 320 stacked along the height direction of the working cylinder assembly. The flange 310 is sleeved on the outside of the energy storage cylinder 20 and fixed to the top of the disc springs 320. Figure 5 and Figure 6As shown, the disc spring assembly 30 includes multiple disc springs 320 stacked along the height direction of the working cylinder body 10, wherein any two adjacent disc springs 320 are symmetrically distributed vertically along the height direction of the working cylinder body 10. The disc spring assembly 30 has stable and reliable deformation, and can be stably compressed to store energy under the compression of the energy storage cylinder 20. Moreover, when releasing energy, it can also smoothly elongate to release energy, which can avoid instantaneous complete energy release or instantaneous complete energy storage, and prevent the energy storage cylinder 20 from moving too fast and colliding with the working cylinder body 10 or other structures. Furthermore, the disc spring assembly 30 is sleeved on the outer periphery of the working cylinder body 10 and distributed circumferentially around the working cylinder body 10. Compared with multiple disc spring assemblies 30 spaced apart in the circumferential direction of the working cylinder body 10, it can more stably support the energy storage cylinder 20, can also deform evenly in the circumferential direction, and is simple to assemble.

[0048] When energy storage is needed, high-pressure oil can be pumped into the oil storage channel 110. The high-pressure oil enters the energy storage cylinder 20 through the oil passage 120. The energy storage cylinder 20 can move down along the working cylinder body 10 under the pressure of the high-pressure oil, while squeezing the disc spring assembly 30. The disc spring assembly 30 compresses and stores energy. Figure 6 A cross-sectional schematic diagram is shown when the energy storage cylinder 20 is in the lower limit position of the working cylinder body 10. Figure 6 The denser and shallower filling material represents high-pressure oil, while the sparser dot-like filling material represents low-pressure oil. At this point, the high-pressure oil fills the energy storage cylinder 20, and the disc spring assembly 30 has completed compression and energy storage.

[0049] When energy needs to be released, the disc spring assembly 30 extends to release energy. The disc spring assembly 30 pushes the energy storage cylinder 20 to move upward along the working cylinder body 10. The high-pressure oil in the energy storage cylinder 20 reverses through the oil passage 120 into the oil storage channel 110, and then enters other working oil chambers in the working cylinder body 10, thereby realizing the extension or retraction of the piston rod 180. Figure 5 The diagram shows a cross-sectional view of the energy storage cylinder 20 when it is in the upper limit position of the working cylinder body 10. At this time, the high-pressure oil in the energy storage cylinder 20 can be completely discharged and the energy storage is released. Of course, it can also be used as the position of the energy storage cylinder 20 in the initial assembly state. During the initial assembly, since there is no high-pressure oil pressing down on the energy storage cylinder 20, the disc spring assembly 30 is in the extended state and the energy storage cylinder 20 is in the upper limit position.

[0050] like Figure 1 , Figure 2 and Figure 4As shown, the guiding device 40 includes a guide rod 410 and a guide seat 420. The bottom end of the guide rod 410 is fixed to the flange 310, and the guide seat 420 is fixed to the working cylinder assembly. The guide seat 420 is provided with a through hole 423, through which the guide rod 410 passes and can move up and down. By setting the guide rod 410 of the guiding device 40 to be connected to the flange 310 and the guide seat 420 of the guiding device 40 to be connected to the working cylinder assembly, and setting the guide rod 410 to pass through the through hole 423 of the guide seat 420, the guide rod 410 can move up and down with the flange 310 in the through hole 423 of the guide seat 420 during the compression and extension of the disc spring 320, which drives the flange 310 to move up and down relative to the working cylinder assembly. Furthermore, the guide seat 420 can restrict the movement of the guide rod 410 on the horizontal plane, thereby preventing the flange 310 from rotating relative to the working cylinder assembly.

[0051] In this embodiment, as Figure 5 As shown, when the energy storage cylinder 20 is at its upper limit position on the working cylinder body 10, at least a portion of the opening of the oil passage 120 on the outer side is directly above the upper end face of the insertion hole. When energy storage is required, high-pressure oil can exert a downward thrust on the inner surface of the bottom wall of the energy storage cylinder 20 through the oil passage 120, thereby facilitating the downward movement of the energy storage cylinder 20 to compress the disc spring assembly 30 for energy storage, making it convenient and reliable to use. After the high-pressure oil compresses the energy storage cylinder 20 and moves it downward a certain distance, the bottom wall of the energy storage cylinder 20 will release the blockage of the oil passage 120, allowing high-pressure oil to smoothly enter the energy storage cylinder 20 for energy storage.

[0052] Of course, since the structure and position of the oil passage 120 will not change, during the process of the energy storage cylinder 20 moving up and down along the working cylinder body 10, at least part of the opening of the oil passage 120 on the outside will always be located directly above the upper end face of the insertion hole, which is conducive to the high pressure oil flowing out of the oil passage 120 pressing down on the energy storage cylinder 20.

[0053] In some embodiments, the spring-hydraulic operating mechanism further includes: a limit switch 710, which is disposed on the working cylinder assembly and is capable of detecting the movement distance of the flange 310, with a portion of the limit switch 710 connected to the flange 310; and a safety valve 720, which is disposed on the working cylinder assembly and includes a rod 721 connected to the flange 310. The safety valve 720 is capable of detecting the movement distance of the flange 310 to detect the compression stroke of the disc spring 320, and is capable of releasing pressure if the compression stroke of the disc spring 320 exceeds a safety value.

[0054] In these embodiments, the deformation height of the disc spring assembly 30 is monitored by the limit switch 710, thereby monitoring the stored energy. Both the limit switch 710 and the safety valve 720 are connected to the flange 310. The changes in the compression stroke of the disc spring 320 are used to monitor the changes in the energy stored in the mechanism and the system pressure. If the compression stroke of the disc spring 320 exceeds the safety value, the high oil pressure in the system is released to the low-pressure oil tank through the safety valve 720 until the pressure returns to the safe range. By using a guide device 40 to connect the flange 310 and the working cylinder assembly, on the one hand, since the limit switch 710 and the safety valve 720 use the flange 310 as a reference when measuring distance, it can prevent the flange 310 from deflecting at a certain angle relative to the working cylinder assembly during its up-and-down movement. This prevents the limit switch 710 and the safety valve 720 mounted on the flange 310 from being inaccurate in distance measurement due to the deflection of the flange 310, thus improving the accuracy of distance measurement and enhancing product performance. On the other hand, it can also avoid the problem of damage to the connection between the limit switch 710, the safety valve 720 and the flange 310 or the working cylinder assembly due to the deflection of the flange 310.

[0055] In some embodiments, such as Figure 3 , Figure 5 and Figure 6 As shown, the spring-hydraulic operating mechanism also includes: a mounting base 50 fixed to the top surface of the flange 310; the bottom end of the rod 721 fixed to the mounting base 50; and the bottom end of the guide rod 410 fixed to the mounting base 50. This arrangement ensures that the bottom ends of both the guide rod 410 and the rod 721 of the safety valve 720 are fixed to the mounting base 50. This achieves a stable installation of the guide rod 410 without requiring a separate mounting structure for it, saving one mounting structure, simplifying the product structure, and reducing product costs.

[0056] Regarding the specific structure of the mounting base 50, in some embodiments, such as Figure 1 , Figure 2 and Figure 4As shown, the mounting base 50 includes: a right-angle plate 510, which includes a first connecting plate 511 and a second connecting plate 512 connected to each other. The first connecting plate 511 has a fixing hole 5111 at its end away from the second connecting plate 512, which is adapted to the guide rod 410. The guide rod 410 passes through the fixing hole 5111 and is fixedly connected to the right-angle plate 510 by a first fastener; a first fixing plate 520, located below the second connecting plate 512, which has multiple first fastening holes 5201 and at least one assembly hole 5202 adapted to the rod body 721. 721 is inserted into the assembly hole 5202 and the connecting rod 721 and the first fixing plate 520 are fixed by the second fastener; the second fixing plate 530 is located below the first fixing plate 520. The second fixing plate 530 is provided with a plurality of second fastening holes 5301, and the second connecting plate 512 is provided with a plurality of third fastening holes 5121. The plurality of first fastening holes 5201, the plurality of second fastening holes 5301 and the plurality of third fastening holes 5121 correspond one-to-one, and the third fastener passes through the plurality of first fastening holes 5201, the plurality of second fastening holes 5301 and the plurality of third fastening holes 5121 to install the second fixing plate 530 on the flange 310. The first connecting plate 511 of the right-angle plate 510 is used to install the guide rod 410. The second connecting plate 512 of the right-angle plate 510 is connected to the first fixing plate 520 and the second fixing plate 530. Multiple first fastening holes 5201, multiple second fastening holes 5301 and multiple third fastening holes 5121 are respectively provided on the first fixing plate 520, the second fixing plate 5301 and the second connecting plate 5121. Multiple third fasteners pass through the multiple first fastening holes 5201, the multiple second fastening holes 5301 and the multiple third fastening holes 5121 to install the mounting base 50 on the flange 310. The mounting base 50 and the flange 310 are fixed by the third fasteners. It has the advantages of stable connection, convenient installation and low cost. Further, optionally, as an example, the first fixing plate 520 is longer than the second fixing plate 530, and an assembly hole 5202 is provided at the position where the first fixing plate 520 extends beyond the second fixing plate 530 for installing the rod 721 of the safety valve 720, so that the rod 721 is connected to the first fixing plate 520.

[0057] Regarding the specific structure and installation structure of the guide seat 420, in some embodiments, such as Figure 1 , Figure 2 and Figure 4As shown, the guide seat 420 includes: a seat body 421, on which a mounting hole 424 extending vertically is provided, and the outer side wall of the seat body 421 is fixed to the working cylinder assembly; and a bushing 422, disposed in the mounting hole 424, and having a through hole 423. The guide seat 420 includes the seat body 421 and the bushing 422. The seat body 421 is fixedly connected to the working cylinder assembly. The seat body 421 can be made of a high-strength material such as cast iron or steel to improve its structural strength, making the connection between the seat body 421 and the working cylinder assembly more stable. Furthermore, the seat body 421 surrounds the outside of the bushing 422, also protecting the bushing 422 and preventing it from deforming under stress. The bushing 422 has a through hole 423 that mates with a guide rod 410, allowing the guide rod 410 to move up and down within the through hole 423.

[0058] In some embodiments, the hardness of the bushing 422 is less than that of the guide rod 410; the gap between the through hole 423 and the guide rod 410 ranges from 0 mm to 0.05 mm. The lower hardness of the bushing 422 compared to the guide rod 410 provides lubrication, allowing the guide rod 410 to move more smoothly relative to the bushing 422. Furthermore, the gap between the through hole 423 and the guide rod 410 ranges from 0 mm to 0.05 mm. Within this range, the diameters of the guide rod 410 and the through hole 423 are not difficult to guarantee due to excessively high precision requirements, thus avoiding machining difficulties. Simultaneously, it ensures that the guide rod 410 does not deflect when moving within the through hole 423, or the deflection is very small. The guide seat 420 can restrict the movement of the guide rod 410 on the horizontal plane, thereby preventing the flange 310 from rotating relative to the working cylinder assembly. As an example, optionally, the bushing 422 is made of copper, and the guide rod 410 is made of cast iron or steel.

[0059] Regarding the specific structure of the working cylinder assembly, in some embodiments, such as Figure 3 , Figure 5 and Figure 6As shown, the working cylinder assembly includes: a working cylinder body 10, with an oil storage channel 110 inside the working cylinder body 10, and an oil passage hole 120 on the outer side wall of the working cylinder body 10 communicating with the oil storage channel 110; an energy storage cylinder 20 sleeved on the outer side of the working cylinder body 10; an oil pump motor bracket 610 fixedly connected to the working cylinder body 10; an oil storage tank 620 fixedly connected to the working cylinder body 10; and a guide seat 420 fixedly connected to any one of the working cylinder body 10, the oil pump motor bracket 610, and the oil storage tank 620. The guide seat 420 can be fixed to the working cylinder body 10, or fixed relative to the working cylinder body 10 and capable of withstanding large external forces on the oil pump motor bracket 610 or the oil storage tank 620, both of which can prevent the flange 310 from rotating relative to the working cylinder body 10.

[0060] Regarding the placement of the guide seat 420, in some embodiments, the guide seat 420 is fixedly connected to the side wall of the working cylinder body 10. The seat body 421 has multiple mounting holes 424, and the side wall of the working cylinder body 10 has multiple mating holes. The spring-hydraulic operating mechanism also includes multiple fourth fasteners 425, which pass through the mounting holes 424 one-to-one and are locked in the mating holes. Preferably, the guide seat 420 is fixed to the side wall of the working cylinder body 10, which facilitates the fixed installation of the guide seat 420 and allows the solution to be implemented using a shorter guide rod 410, thus minimizing costs.

[0061] In some embodiments, the spring hydraulic operating mechanism further includes: an oil pump 630, mounted on an oil pump motor bracket 610, the oil inlet of the oil pump 630 being connected to the first oil outlet of the oil storage tank 620, and the oil outlet of the oil pump 630 being connected to the oil storage channel 110, the oil pump 630 being able to pump high-pressure oil into the oil storage channel 110; a limit switch 710 connected to the disc spring assembly 30, the limit switch 710 being able to detect the deformation height of the disc spring assembly 30, and controlling the oil pump 630 to start when the disc spring assembly 30 deforms to a first set height, and controlling the oil pump 630 to stop when the disc spring assembly 30 deforms to a second set height; wherein, the energy storage cylinder 20 is able to move along the working cylinder body 10 under the pressure of the high-pressure oil inside it.

[0062] In these embodiments, the limit switch 710 monitors the deformation height of the disc spring assembly 30, thereby monitoring the stored energy and promptly controlling the oil pump 630 to activate again to utilize high-pressure oil to compress the disc spring assembly 30 for energy storage. This effectively prevents the operating mechanism from failing to effectively control the piston rod 180 within the working cylinder body 10 to perform corresponding actions due to insufficient energy storage in the disc spring assembly 30 after receiving an opening or closing command. The limit switch 710 can also control the oil pump 630 to shut down promptly, preventing the oil pump 630 from sending too much high-pressure oil into the energy storage cylinder 20, which could lead to excessive pressure in the energy storage cylinder 20 and the oil storage channel 110, affecting product safety. Of course, to ensure product safety, the pressure relief device of the operating mechanism can also be used for pressure relief, providing double-layer protection.

[0063] Furthermore, when the disc spring assembly 30 moves to the first set height, the energy storage cylinder 20 is located at or below the upper limit position of the working cylinder body 10. If the energy storage cylinder 20 is located at the upper limit position of the working cylinder body 10 when the disc spring assembly 30 moves to the first set height, the limit switch 710 will replenish energy after the disc spring assembly 30 has completely released its energy. If the energy storage cylinder 20 is below the upper limit position when the disc spring assembly 30 moves to the first set height, the limit switch 710 will replenish energy before the disc spring assembly 30 has completely released its energy. This ensures that when the operating mechanism receives an opening or closing command at any time, it can promptly perform the opening or closing action with the energy stored in the disc spring assembly 30, avoiding insufficient energy or untimely energy replenishment.

[0064] It should be noted that if the energy storage cylinder 20 is below the upper limit position when the disc spring assembly 30 moves to the first set height, then except during initial assembly, the energy storage cylinder 20 will always be below the upper limit position during normal operation of the operating mechanism. The oil passage 120 will not be blocked by the inner wall of the insertion hole during this process. In this case, high-pressure oil will smoothly enter the energy storage cylinder 20 through the oil passage 120. Although the effect of the high-pressure oil at the opening of the oil passage 120 on the downward pressure of the energy storage cylinder 20 is less significant compared to when it is at the upper limit position, it is still beneficial for downward pressure on the oil storage cylinder compared to the oil passage 120 laterally penetrating the side wall of the working cylinder body 10.

[0065] Furthermore, when the disc spring assembly 30 moves to the second set height, the energy storage cylinder 20 is located at or above the lower limit position of the working cylinder body 10. If the energy storage cylinder 20 is located at the lower limit position of the working cylinder body 10 when the disc spring assembly 30 moves to the second set height, the limit switch 710 will control the oil pump 630 to stop working when the disc spring assembly 30 is fully compressed and the energy storage reaches its upper limit, ensuring sufficient energy storage. If the energy storage cylinder 20 is above the lower limit position when the disc spring assembly 30 moves to the first set height, the limit switch 710 will stop replenishing energy before the disc spring assembly 30 is fully charged, reducing the probability of excessive pressure in the energy storage cylinder 20 and mitigating risk.

[0066] In some embodiments, the spring-hydraulic operating mechanism includes: a piston rod 180 movably disposed in the working chamber of the working cylinder body 10, the piston rod 180 having a plug portion 181 at one end near the bottom of the working chamber, a cavity above the plug portion 181 in the working chamber being a high-pressure oil chamber 160, the high-pressure oil chamber 160 being connected to an oil storage channel 110, and a cavity below the plug portion 181 in the working chamber being a switching oil chamber 170; and a control valve assembly, which is used to control the piston rod 180 to move upward under the pressure of the high-pressure oil in the switching oil chamber 170 to perform a closing operation, and also to control the piston rod 180 to move downward under the pressure of the high-pressure oil in the high-pressure oil chamber 160 to perform a opening operation.

[0067] In these embodiments, the control of opening and closing actions and the control of energy storage can be independent of each other. The limit switch 710 does not need to consider the position of the piston rod 180; it can only consider the deformation height of the disc spring assembly 30 for energy storage. The limit switch 710 can observe the deformation height of the disc spring assembly 30 at any time and store energy promptly. During energy storage, the control valve assembly can control the piston rod 180 to move upwards, downwards, or remain unchanged at its original open or closed position. Changes in the control valve assembly also do not need to consider the energy storage situation. Upon receiving an opening or closing command, it can control the corresponding valve body to change, directly utilizing the energy stored in the disc spring assembly 30 and using the high-pressure oil flowing from the energy storage cylinder 20 to control the piston rod 180 to perform the corresponding action. The energy released by the disc spring assembly 30 can be used for both opening and closing.

[0068] Furthermore, such as Figure 7 and Figure 8 As shown, the control valve assembly 80 includes a control valve 810, a closing valve 820, a self-defense delay valve 840, and a terminating valve 830. The control valve 810 includes a valve body 811 and a valve stem 812 movably disposed within the valve body 811. The valve body 811 has a high-pressure oil valve port 813, a low-pressure oil valve port 814, and a switching valve port 815. The high-pressure oil valve port 813 is connected to the high-pressure oil chamber 160, the low-pressure oil valve port 814 is connected to the second oil outlet of the oil reservoir 620, and the switching valve port 815 is connected to the switching oil chamber 170.

[0069] Upon receiving the closing command, the closing valve 820 opens and can control the valve 810 rod to move to the first set position inside the valve body 811. The high-pressure oil valve port 813 is connected to the changing valve port 815 through the inner cavity of the valve body 811. The piston rod 180 moves upward under the action of the high-pressure oil in the changing oil chamber 170 to perform the closing operation.

[0070] At the same time, when the gate valve 820 is opened, the high-pressure oil in the valve body 811 can enter the delay channel 841 of the self-defense delay valve 840, and push up the valve core 842 of the self-defense delay valve 840 to open the self-defense delay valve 840.

[0071] Upon receiving the tripping command, the tripping valve 830 opens. With the self-defense delay valve 840 open, the tripping valve 830 controls the valve 810 rod to move to the second set position inside the valve body 811. The low-pressure oil valve port 814 is connected to the change valve port 815 through the inner cavity of the valve body 811. The piston rod 180 moves downward under the action of the high-pressure oil in the high-pressure oil chamber 160 to perform the tripping operation.

[0072] The following is for reference Figure 7 and Figure 8 This invention describes the working principle of the operating mechanism of a specific embodiment of the present invention when it continuously receives closing-opening commands. Figure 7 and Figure 8 The denser filler represents high-pressure oil, while the sparser, dot-like filler represents low-pressure oil.

[0073] like Figure 7 As shown, after receiving the closing command, the control valve assembly 80 opens the closing valve 820, connecting oil circuits 3c and 4d. High-pressure oil near the high-pressure oil valve port 813 can be depressurized via oil circuit 3c, causing the high-pressure oil at the top of the valve stem 812 to be depressurized through the central channel of the valve stem 812 to the vicinity of the high-pressure oil valve port 813. Furthermore, the high-pressure oil in the oil storage channel 110 can enter the bottom of the valve body 811 via the high-pressure oil valve port 813, oil circuits 3c and 4d, allowing the valve stem 812 to move upwards under the action of the high-pressure oil. This causes the high-pressure oil valve port 813 and the switching valve port 815 to connect, allowing the high-pressure oil in the oil storage channel 110 to enter the switching oil chamber 170 via the high-pressure oil valve port 813 and the switching valve port 815. Under the action of the high-pressure oil in the switching oil chamber 170, the piston rod 180 is pushed upwards, closing the switch connector of the high-pressure switch (such as a circuit breaker) and performing the closing operation.

[0074] During the upward movement of valve stem 812, oil circuit 3c and oil circuit 2b are connected. The high-pressure oil in oil circuit 3c can enter the delay channel 841 of the self-defense delay valve 840 through oil circuit 2b, thereby pushing valve core 842 upward until valve core 842 moves to the upper position. At this time, the connecting hole on valve core 842 can connect oil circuit 1a and oil circuit 5e, and the self-defense delay valve 840 opens.

[0075] Upon receiving the gate opening command, the gate opening valve opens. Although the gate opening valve is open, if oil circuit 1a and oil circuit 5e are not connected, then oil circuit 4 and oil circuit 5, even after being connected, will still appear as if they are open. Therefore, the valve core 842 needs to be moved to its designated position. Only after oil circuit 1a and oil circuit 5e are connected through the connecting hole on the valve core 842 can the oil circuit be unblocked. The upward movement of the valve core 842 requires a certain amount of time. The time it takes for the high-pressure oil to flow in the delay channel 841 and the time it takes for the valve core 842 to move to its designated position can be used as the delay time. Only after a certain delay can the subsequent gate opening action be performed, avoiding instantaneous gate opening after closing and reducing the possibility of malfunction of the operating mechanism. Moreover, the use of physical delay, rather than timer-based delay, ensures high reliability.

[0076] like Figure 8 As shown, after the delay ends, i.e. after the self-defense delay valve 840 opens, the gate valve is in the open state, and oil circuits 4d, 5e, 1a and the energy storage tank are connected. The high-pressure oil at the bottom of the valve stem 812 can be quickly depressurized through oil circuits 4d, 5e and 1a, causing the valve stem 812 to move downward instantaneously. The high-pressure oil at the switching valve port 815 and the high-pressure oil valve port 813 can be depressurized through the central channel of the valve body 811 to the top of the valve body 811, so that the valve body 811 can move downward under the action of the high-pressure oil at the top, so that the switching valve port 815 is connected to the low-pressure oil valve port 814. At this time, the low-pressure oil in the oil storage tank 620 can enter the switching oil chamber 170 through the low-pressure oil valve port 814 and the switching valve port 815. The piston rod 180 moves downward under the action of the high-pressure oil in the high-pressure oil chamber 160, opening the switch connector of the high-pressure switch and performing the tripping operation.

[0077] A third aspect of the present invention provides a high-voltage switch assembly, comprising: a high-voltage switch (not shown in the figure), an operating mechanism as described in any of the above embodiments, and a high-voltage switch control device (not shown in the figure). A piston rod 180 is connected to the switch terminal of the high-voltage switch, and the piston rod 180 is capable of pulling the high-voltage switch to open or close; the high-voltage switch control device is connected to a control valve assembly 80, and is used to control the piston rod 180 to perform an opening or closing operation via the control valve assembly 80. The high-voltage switch assembly provided in this aspect embodiment has the beneficial effects of any of the above embodiments due to having the operating mechanism of any of the above embodiments, which will not be described in detail here.

[0078] Furthermore, the high-voltage switch control device may include manual buttons for manual control of the opening or closing of the high-voltage switch.

[0079] Furthermore, the high-voltage switch control device may also include a detection module, which detects whether there are any abnormalities in the high-voltage circuit where the high-voltage switch is located, such as short circuit, open circuit, voltage instability, etc., and controls the high-voltage switch to open or close accordingly.

[0080] Furthermore, the high-voltage switch assembly also includes: a mounting box (not shown in the figure), the top of which is provided with an insulating gas protection chamber (not shown in the figure), and the high-voltage switch is installed inside the insulating gas protection chamber; the operating mechanism is installed inside the mounting box, and the top wall of the mounting box is provided with a through hole, through which the piston rod 180 is connected to the switch connector of the high-voltage switch.

[0081] While embodiments of the present invention have been described in detail above, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the invention. It should be understood that, to those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present invention as defined in the claims.

Claims

1. A spring-hydraulic operating mechanism, characterized in that, The spring-hydraulic operating mechanism includes: Working cylinder assembly; An energy storage cylinder (20) is sleeved on the outside of the working cylinder assembly and can move up and down along the working cylinder assembly; A disc spring assembly (30) is connected to the energy storage cylinder (20). The disc spring assembly (30) includes a flange (310) and a plurality of disc springs (320) stacked along the height direction of the working cylinder assembly. The flange (310) is sleeved on the outside of the energy storage cylinder (20) and fixed to the top of the disc springs (320). The guide device (40) includes a guide rod (410) and a guide seat (420). The bottom end of the guide rod (410) is fixed on the flange (310), and the guide seat (420) is fixed on the working cylinder assembly. The guide seat (420) is provided with a through hole (423), and the guide rod (410) passes through the through hole (423) and can move up and down in the through hole (423). A safety valve (720) is disposed on the working cylinder assembly, and the safety valve (720) includes a rod (721). Mounting base (50) is fixed on the top surface of flange (310). Mounting base (50) includes right angle plate (510). Right angle plate (510) includes a first connecting plate (511) and a second connecting plate (512) connected to each other. The first connecting plate (511) has a fixing hole (5111) adapted to the guide rod (410) at one end away from the second connecting plate (512). The guide rod (410) passes through the fixing hole (5111). The mounting base (50) further includes a first fixing plate (520) disposed below the second connecting plate (512). The first fixing plate (520) is provided with at least one mounting hole (5202), which is adapted to the rod (721), and the rod (721) passes through the mounting hole (5202).

2. The spring-hydraulic operating mechanism according to claim 1, characterized in that, The spring-hydraulic operating mechanism also includes: Limit switch (710), the limit switch (710) is disposed on the working cylinder assembly, the limit switch (710) is capable of detecting the movement distance of the flange (310), and part of the structure of the limit switch (710) is connected to the flange (310); The safety valve (720) can detect the movement distance of the flange (310) to detect the compression stroke of the disc spring (320), and the safety valve (720) can release pressure when the compression stroke of the disc spring (320) exceeds the safety value.

3. The spring-hydraulic operating mechanism according to claim 1, characterized in that, The guide rod (410) and the right-angle plate (510) are fixedly connected by the first fastener, and the rod body (721) and the first fixing plate (520) are fixedly connected by the second fastener. The mounting base (50) further includes a second fixing plate (530) disposed below the first fixing plate (520). The first fixing plate (520) is provided with a plurality of first fastening holes (5201), the second fixing plate (530) is provided with a plurality of second fastening holes (5301), and the second connecting plate (512) is provided with a plurality of third fastening holes (5121). The plurality of first fastening holes (5201), the plurality of second fastening holes (5301), and the plurality of third fastening holes (5121) correspond one-to-one, and the third fastener passes through the plurality of first fastening holes (5201), the plurality of second fastening holes (5301), and the plurality of third fastening holes (5121) to mount the mounting base (50) on the flange (310).

4. The spring-hydraulic operating mechanism according to claim 2, characterized in that, The guide seat (420) includes: The seat body (421) is provided with a mounting hole (424) extending in a vertical direction, and the outer side wall of the seat body (421) is fixed to the working cylinder assembly. A bushing (422) is disposed in the mounting hole (424), and the bushing (422) is provided with the through hole (423).

5. The spring-hydraulic operating mechanism according to claim 4, characterized in that, The hardness of the bushing (422) is less than that of the guide rod (410); The gap between the through hole (423) and the guide rod (410) ranges from 0 mm to 0.05 mm.

6. The spring-hydraulic operating mechanism according to claim 5, characterized in that, The working cylinder assembly includes: The working cylinder body (10) has an oil storage channel (110) inside, and an oil passage hole (120) communicating with the oil storage channel (110) is provided on the outer side wall of the working cylinder body (10). The energy storage cylinder (20) is sleeved on the outer side of the working cylinder body (10). The oil pump motor bracket (610) is fixedly connected to the working cylinder body (10); An oil reservoir (620) is fixedly connected to the working cylinder body (10); The guide seat (420) is fixedly connected to any one of the working cylinder body (10), the oil pump motor bracket (610), and the oil storage tank (620).

7. The spring-hydraulic operating mechanism according to claim 6, characterized in that, The guide seat (420) is fixedly connected to the side wall of the working cylinder body (10); The seat body (421) is provided with a plurality of mounting holes (424), the side wall of the working cylinder body (10) is provided with a plurality of mating holes, and the spring hydraulic operating mechanism also includes a plurality of fourth fasteners (425), which pass through the mounting holes (424) one by one and are locked in the mating holes.

8. The spring-hydraulic operating mechanism according to claim 6, characterized in that, The spring-hydraulic operating mechanism also includes: An oil pump (630) is mounted on the oil pump motor bracket (610). The oil inlet of the oil pump (630) is connected to the first oil outlet of the oil storage tank (620), and the oil outlet of the oil pump (630) is connected to the oil storage channel (110). The oil pump (630) can pump high-pressure oil into the oil storage channel (110). The limit switch (710) is connected to the disc spring assembly (30). The limit switch (710) can detect the deformation height of the disc spring assembly (30), and control the oil pump (630) to start when the disc spring assembly (30) deforms to a first set height, and control the oil pump (630) to stop when the disc spring assembly (30) deforms to a second set height. The energy storage cylinder (20) can move along the working cylinder body (10) under the pressure of the high-pressure oil inside it.

9. The spring-hydraulic operating mechanism according to claim 6, characterized in that, The spring-hydraulic operating mechanism includes: A piston rod (180) is movably disposed in the working chamber of the working cylinder body (10). The piston rod (180) has a plug part (181) at one end near the bottom of the working chamber. The cavity above the plug part (181) in the working chamber is a high-pressure oil chamber (160). The high-pressure oil chamber (160) is connected to the oil storage channel (110). The cavity below the plug part (181) in the working chamber is a changing oil chamber (170). The control valve assembly is used to control the piston rod (180) to move upward under the pressure of the high-pressure oil in the changing oil chamber (170) to perform a closing operation, and also to control the piston rod (180) to move downward under the pressure of the high-pressure oil in the high-pressure oil chamber (160) to perform a opening operation.

10. The spring-hydraulic operating mechanism according to claim 9, characterized in that, The control valve assembly (80) includes: A control valve (810) includes a valve body (811) and a valve stem (812) movably disposed within the valve body (811). The valve body (811) has a high-pressure oil valve port (813), a low-pressure oil valve port (814), and a switching valve port (815). The high-pressure oil valve port (813) is connected to the high-pressure oil chamber (160), the low-pressure oil valve port (814) is connected to the second oil outlet of the oil reservoir (620), and the switching valve port (815) is connected to the switching oil chamber (170). When the gate valve (820) is opened, the gate valve (820) can control the valve stem (812) to move to a first set position inside the valve body (811). The high-pressure oil valve port (813) is connected to the change valve port (815) through the inner cavity of the valve body (811). The piston rod (180) moves upward under the action of high-pressure oil in the change oil chamber (170) to perform the gate closing operation. When the closing valve (820) is opened, the high-pressure oil in the valve body (811) can enter the delay channel (841) of the self-defense delay valve (840), push up the valve core (842) of the self-defense delay valve (840) and open the self-defense delay valve (840). When the gate valve (830) is open, the gate valve (830) can control the valve stem (812) to move to a second set position inside the valve body (811) while the self-defense delay valve (840) is open. The low-pressure oil valve port (814) is connected to the change valve port (815) through the inner cavity of the valve body (811). The piston rod (180) moves down under the action of high-pressure oil in the high-pressure oil chamber (160) to perform the gate opening operation.

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