Hydraulic support lifting system

Abstract

The application discloses a hydraulic support lifting system, which comprises a hydraulic support, a supporting device and a lifting bottom device. The supporting device is arranged between the hydraulic support and the ground to support the hydraulic support, and the length of the supporting device is adjustable to lift the hydraulic support. The lifting bottom device is arranged at the lower side of the hydraulic support to temporarily support the hydraulic support when the hydraulic support moves. The lifting bottom device comprises a speed regulating assembly, which is used to adjust the lifting speed of the lifting bottom device to make the lowering process of the lifting bottom device stable. The hydraulic support lifting system has the advantages of stable lifting process and high stability.

Description

Technical Field

[0001] This invention relates to the field of valve body technology, and more specifically, to a hydraulic support lifting system. Background Technology

[0002] Mining hydraulic supports are installed at the coal mining face to support the coal mining passage and form a safe space for coal mining, transportation, and personnel passage. As the coal mining machine in the fully mechanized mining face reciprocates and advances vertically and in the direction of the working face, the hydraulic supports need to be raised and lowered during the coal mining process to reduce the friction between the hydraulic supports and the bottom plate and to assist in the movement of the hydraulic supports. The stability of the hydraulic support lifting system in related technologies is relatively low. Summary of the Invention

[0003] This invention is based on the inventor's discoveries and understanding of the following facts and problems:

[0004] In the related technology, the one-way throttle valve of the hydraulic support lifting system is located in the rod chamber of the column cylinder. The force-bearing area of ​​the rod chamber of the column cylinder is small, which makes it easy to cause problems such as cylinder explosion due to pressure buildup, resulting in poor stability.

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a hydraulic support lifting system, which has the advantages of smooth lifting and lowering processes and high stability.

[0006] The hydraulic support lifting system of this invention includes a hydraulic support; a support device disposed between the hydraulic support and the ground to support the hydraulic support, and the length of the support device is adjustable to lift the hydraulic support; and a bottom lifting device disposed on the lower side of the hydraulic support to temporarily support the hydraulic support when the hydraulic support moves, the bottom lifting device including a speed regulating component adapted to adjust the lifting speed of the bottom lifting device to make the descent process of the bottom lifting device smooth.

[0007] The hydraulic support lifting system of this invention has the advantages of smooth lifting process and high stability.

[0008] In some embodiments, the bottom-lifting device includes a bottom-lifting cylinder, and the speed regulating component is connected to the rodless chamber of the bottom-lifting cylinder to reduce the inlet and outlet speed of the rodless chamber of the bottom-lifting cylinder.

[0009] In some embodiments, the speed control assembly includes a one-way throttle valve connected to the rodless chamber of the lifting cylinder, wherein the throttling area of ​​the one-way throttle valve is smaller when the rodless chamber of the lifting cylinder is drained than when the rodless chamber of the lifting cylinder is filled with liquid.

[0010] In some embodiments, the speed regulating assembly further comprises a safety valve connected between the one-way throttle valve and the rodless chamber of the lift cylinder, the safety valve adapted to discharge hydraulic fluid when the pressure in the rodless chamber of the lift cylinder is greater than a set threshold.

[0011] In some embodiments, the one-way throttle valve has a safety assembly disposed at one end of the one-way throttle valve facing the lift cylinder, the safety assembly adapted to discharge hydraulic fluid when the pressure in the one-way throttle valve is greater than a set threshold.

[0012] In some embodiments, the one-way throttle valve comprises:

[0013] a valve body having a liquid passage therethrough along an axial direction of the valve body, the liquid passage having an annular flange disposed therein;

[0014] a valve core having an end face and an annular face extending along a circumferential direction of the end face, the annular face having a flow passage therethrough, the flow passage having an angle with respect to the axial direction of the valve body, the end face having a throttle hole therethrough, the throttle hole having an angle with respect to the axial direction of the valve body;

[0015] a resilient member acting between the valve core and the valve body, adapted to press the annular face against the annular flange to block the flow passage.

[0016] In some embodiments, the annular face is a tapered face, the tapered face having a diameter gradually increasing along a direction away from the end face to form an annular cavity at an outer circumferential side of the annular face, one end of the flow passage being in communication with the annular cavity, the annular cavity being isolated from the liquid passage to reduce a flow area of the liquid passage when the annular face is pressed against the annular flange.

[0017] In some embodiments, the flow passage has a plurality of flow passages, a sum of flow areas of the plurality of flow passages being greater than or equal to a flow area of the liquid passage.

[0018] In some embodiments, a ratio of a flow area of the throttle hole to the sum of flow areas of the plurality of flow passages is greater than a first set ratio and less than a second set ratio.

[0019] In some embodiments, the liquid passage comprises a first port and a second port, the first port being located at one end of the liquid passage and at a side of the annular flange facing away from the valve core, the first port adapted to be in communication with the rodless chamber of the lift cylinder, the second port being located at the other end of the liquid passage, the second port adapted to be connected to a liquid supply line of the lift device. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of a hydraulic support lifting system of an embodiment of the present application.

[0021] Figure 2 is a structural schematic diagram of a one-way throttle valve of a hydraulic support lifting system of an embodiment of the present application.

[0022] Figure 3 is a schematic diagram of a safety assembly of a hydraulic support lifting system of an embodiment of the present application.

[0023] Reference Signs:

[0024] lifting bottom oil cylinder 1; rod cavity 11; rodless cavity 12;

[0025] speed regulating assembly 2; one-way throttle valve 21; valve body 211; first port 2111; second port 2112; valve core 212; throttle hole 2121; overflow hole 2122; elastic member 213; safety assembly 214; safety valve 22. DETAILED DESCRIPTION

[0026] Embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0027] The hydraulic support lifting system of an embodiment of the present application is described below in combination with Figure 1 and Figure 2

[0028] The hydraulic support lifting system of an embodiment of the present application comprises a hydraulic support (not shown in the figure) and a lifting bottom device.

[0029] The lifting bottom device is arranged on the lower side of the hydraulic support to temporarily support the hydraulic support when the hydraulic support moves, and the lifting bottom device comprises a speed regulating assembly 2, which is adapted to adjust the speed of the lifting bottom device to make the lowering process of the lifting bottom device smooth.

[0030] Specifically, the lifting bottom device is also arranged on the lower side of the hydraulic support, and the length of the lifting bottom device in the up-down direction is adjustable to temporarily support the lifting bottom device after the supporting device lowers the hydraulic support, and the hydraulic support can move in the horizontal direction to complete the moving of the support.

[0031] The speed regulating assembly 2 has a one-way speed regulating function, and the speed regulating assembly 2 can reduce the lowering speed of the hydraulic support while not changing the lifting speed of the hydraulic support, and the speed regulating assembly 2 can control the speed of the length change of the lifting bottom device, so that the speed regulating assembly 2 can control the lifting speed of the hydraulic support when the lifting bottom device temporarily supports the hydraulic support.

[0032] ​The hydraulic support lifting system of the embodiment of the present application is provided with the speed regulating assembly 2 in the lifting bottom device, when the lifting bottom device temporarily supports the hydraulic support, the speed regulating assembly 2 can reduce the change speed of the length of the lifting bottom device in the up-down direction, so that the hydraulic support slowly rises or slowly falls, the hydraulic support stably falls when falling, the problem of the hydraulic support top beam being too far away from the roof caused by the sudden drop of the hydraulic support is avoided, and the roof support is facilitated. The stable falling has a small influence on the hydraulic and electrical elements in the hydraulic support, especially the shaking of the video system in the hydraulic support is reduced, the pipeline between the supports is less pulled, and the operation reliability of the pipeline between the supports is improved. Therefore, the hydraulic support lifting system of the embodiment of the present application has the advantages of stable lifting process and high stability.

[0033] In some embodiments, the lifting bottom device comprises a lifting bottom oil cylinder 1, and the speed regulating assembly 2 is connected with the rodless cavity 12 of the lifting bottom oil cylinder 1, so as to be suitable for reducing the liquid inlet and outlet speed of the rodless cavity 12 of the lifting bottom oil cylinder 1.

[0034] Specifically, the lifting bottom device comprises a lifting bottom oil cylinder 1, the lifting bottom oil cylinder 1 is arranged along the vertical direction, and the lifting bottom oil cylinder 1 comprises a rod cavity 11 and a rodless cavity 12, the length of the lifting bottom oil cylinder 1 is increased to lift the hydraulic support when liquid is introduced into the rodless cavity 12, the length of the lifting bottom oil cylinder 1 is reduced to drop the hydraulic support when liquid is discharged from the rodless cavity 12, the speed regulating assembly 2 is connected with the rodless cavity 12 of the lifting bottom oil cylinder 1 to reduce the liquid inlet and outlet speed of the lifting bottom oil cylinder 1, and the speed regulating assembly 2 has a one-way speed regulating function, so as to reduce the liquid outlet speed of the rodless cavity 12 while not affecting the liquid inlet speed of the rodless cavity 12, thereby controlling the falling speed of the hydraulic support.

[0035] Therefore, the speed regulating assembly 2 is connected with the rodless cavity 12 of the lifting bottom oil cylinder 1, the space and the stress area of the rodless cavity 12 of the lifting bottom oil cylinder 1 are larger than those of the rod cavity 11 of the lifting bottom oil cylinder 1, the pressure of the rod cavity 11 is greater than that in the rodless cavity 12 when the lifting bottom device is in action, and the rodless cavity 12 is not prone to pressure accumulation, so that the speed regulating assembly 2 can work in the rated pressure range.

[0036] In some embodiments, the speed regulating assembly 2 comprises a one-way throttle valve 21, the one-way throttle valve 21 is connected with the rodless cavity 12 of the lifting bottom oil cylinder 1, and the throttling area of the one-way throttle valve 21 is smaller when the rodless cavity 12 of the lifting bottom oil cylinder 1 discharges liquid than when the rodless cavity 12 of the lifting bottom oil cylinder 1 introduces liquid.

[0037] Specifically, a one-way throttle valve 21 is located at the inlet and outlet of the lifting cylinder 1. The one-way throttle valve 21 has a one-way throttling function. When the hydraulic fluid flows through the one-way throttle valve 21 into the rodless chamber 12 of the lifting cylinder 1, the one-way throttle valve 21 has a flow-through function, so that the hydraulic fluid has a large flow velocity when flowing into the rodless chamber 12 of the lifting cylinder 1, causing the lifting cylinder 1 to extend quickly and lift the hydraulic support quickly. When the hydraulic fluid flows back out of the rodless chamber 12 of the lifting cylinder 1 through the one-way throttle valve 21, the one-way throttle valve 21 has a throttling function, reducing the flow velocity of the hydraulic fluid flowing back out of the rodless chamber 12 of the lifting cylinder 1, reducing the speed at which the lifting cylinder 1 shortens, and causing the hydraulic support to descend slowly.

[0038] Therefore, the one-way throttle valve 21 can slow down the normal fluid inlet and outlet of the rodless chamber 12 of the lifting cylinder 1, thereby making the hydraulic support descent process smooth and reducing the descent rate of the hydraulic support. This has less impact on the hydraulic and electrical components inside the hydraulic support, especially reducing the vibration of the video system inside the hydraulic support, reducing the tension in the inter-support pipeline, and improving the reliability of the inter-support pipeline operation. Thus, the hydraulic support lifting system of this embodiment of the invention has the advantages of smooth lifting process and high stability.

[0039] In some embodiments, the speed control assembly 2 further includes a safety valve 22, which is connected between the one-way throttle valve 21 and the rodless chamber 12 of the lifting cylinder 1. The safety valve 22 is adapted to discharge hydraulic fluid when the pressure in the rodless chamber 12 of the lifting cylinder 1 exceeds a set threshold.

[0040] Specifically, the inlet of safety valve 22 is connected to the inlet and outlet of one-way throttle valve 21 and lifting cylinder 1. When the hydraulic pressure between one-way throttle valve 21 and lifting cylinder 1 is less than the set threshold, one-way throttle valve 21 can work normally, and safety valve 22 is closed. When the hydraulic pressure between one-way throttle valve 21 and lifting cylinder 1 is greater than the set threshold, in order to keep one-way throttle valve 21 at working pressure, safety valve 22 opens, discharges the hydraulic fluid between one-way throttle valve 21 and lifting cylinder 1, and reduces the hydraulic pressure between one-way throttle valve 21 and lifting cylinder 1 to the working range of one-way throttle valve 21.

[0041] Therefore, on the one hand, the one-way throttle valve 21 is always within the normal working range, and on the other hand, the rodless chamber 12 of the lifting cylinder is always within the safe pressure range, ensuring the normal operation of the hydraulic support lifting system of the present invention and improving the stability of the hydraulic support lifting system of the present invention.

[0042] In some embodiments, the one-way throttle valve 21 has a safety assembly 214 arranged at one end of the one-way throttle valve 21 facing the lifting oil cylinder 1, and the safety assembly 214 is adapted to discharge hydraulic fluid when the pressure in the one-way throttle valve 21 is greater than a set threshold.

[0043] Specifically, as shown in the figure, the safety assembly 214 is connected to the end of the one-way throttle valve 21 connected to the rodless cavity 12, and the safety assembly 214 is formed in one body with the one-way throttle valve 2. When the one-way throttle valve 21 is replaced and maintained, the safety assembly 214 is integrally removed, thereby facilitating the integrated replacement and maintenance of the one-way throttle valve 21 and the safety assembly 214. Figure 3

[0044] In some embodiments, the lifting oil cylinder 1 has multiple, and the speed regulating assembly 2 is connected to the rodless cavities 12 of the multiple lifting oil cylinders 1 to adapt to synchronous regulation of the multiple lifting oil cylinders 1.

[0045] Specifically, the multiple lifting oil cylinders 1 are of the same size, and the multiple lifting oil cylinders 1 are uniformly arranged in the horizontal plane in which the hydraulic support extends, so that the multiple lifting oil cylinders 1 jointly lift or lower the hydraulic support.

[0046] In this way, the multiple lifting oil cylinders 1 jointly lift or lower the hydraulic support, reducing the hydraulic pressure in the rodless cavity 12 of the single lifting oil cylinder 1, ensuring that the multiple lifting oil cylinders 1 can all work normally, the one-way throttle valve 21 is connected to the rodless cavities 12 of the multiple lifting oil cylinders 1, enabling the multiple lifting oil cylinders 1 to act synchronously, and making the hydraulic support lift and lower smoothly when the lifting device temporarily supports the hydraulic support.

[0047] In some embodiments, the one-way throttle valve 21 comprises:

[0048] a valve body 211, the valve body 211 being provided with a liquid passage, the liquid passage extending through the valve body 211 along the axial direction of the valve body 211, and the liquid passage being internally provided with an annular flange;

[0049] a valve core 212, the valve core 212 having an end face and an annular face extending along the circumference of the end face, the annular face being provided with a flow hole 2122, the flow hole 2122 extending through the valve core 212, and the flow hole 2122 having an included angle between the extension direction of the flow hole 2122 and the axial direction of the valve body 211, and the end face being provided with a throttling hole 2121, the throttling hole 2121 extending through the valve core 212, and the throttling hole 2121 having an included angle between the extension direction of the throttling hole 2121 and the axial direction of the valve body 211;

[0050] a resilient member 213, the resilient member 213 acting between the valve core 212 and the valve body 211, and being adapted to press the annular face against the annular flange to block the flow hole 2122.

[0051] ​Specifically, the valve body 211 is a tubular structure, an inner cavity of the valve body 211 penetrates through the valve body 211 along a length direction of the valve body 211 to form a liquid passage, the liquid passage is for the hydraulic fluid to flow through the valve body 211, the valve core 212 is arranged in the liquid passage, the valve core 212 is slidable relative to the valve body 211 along the length direction of the valve body 211, the valve core 212 has a first position at one end of a sliding stroke thereof and a second position at the other end of the sliding stroke thereof, at the first position, the through-flow hole 2122 and the throttling hole 2121 are jointly connected to both ends of the liquid passage, so that the one-way throttling valve 21 has a larger through-flow area, at the second position, a portion between the throttling hole 2121 and the through-flow hole 2122 of the valve core 212 abuts against the annular flange, only the throttling hole 2121 is connected to both ends of the liquid passage, so that the one-way throttling valve 21 has a smaller through-flow area.

[0052] Therefore, the extending directions of the throttling hole 2121 and the through-flow hole 2122 arranged in the valve core 212 have an included angle relative to the axial direction of the valve body 211, when the one-way throttling valve 21 works in the water-based and high water-based emulsion working conditions, the obliquely arranged throttling hole 2121 and the through-flow hole 2122 have the effect of peak elimination and pulse prevention, so that the one-way throttling valve 21 can be applicable to the water-based and high water-based emulsion working conditions.

[0053] When the pressures at both ends of the one-way throttling valve 21 are similar, the elastic member presses the valve core 212 against the annular flange, which can improve the one-way throttling effect of the one-way throttling valve 21 when the pressures at both ends thereof are similar, and further make the one-way throttling valve 21 applicable to the water-based and high water-based emulsion working conditions.

[0054] In some embodiments, the annular surface is a tapered surface, the diameter of the tapered surface gradually increases along a direction away from the end surface, so as to form an annular cavity at the outer peripheral side of the annular surface, one end of the through-flow hole 2122 communicates with the annular cavity, and the annular cavity is isolated from the liquid passage when the annular surface abuts against the annular flange, so as to reduce the through-flow area of the liquid passage.

[0055] Specifically, the tapered surface is suitable for abutting against the inner edge of the annular flange, so that the tapered portion and the annular flange form a linear seal when the valve core 212 is in the second position.

[0056] Therefore, when the one-way throttling valve 21 is in the water-based and high water-based emulsion working conditions, the contact area between the tapered portion and the annular flange is reduced, and the pressure at the contact position between the valve core 212 and the valve body 211 is increased, when there is impurity in the hydraulic fluid flowing through the one-way throttling valve 21, the higher pressure between the valve core 212 and the valve body 211 can prevent the impurity from blocking the valve core 212, and ensure that the one-way throttling valve 21 has a smaller through-flow area when the valve core 212 is in the second position.

[0057] In some embodiments, the plurality of flow holes 2122 are provided, and the sum of the flow areas of the plurality of flow holes 2122 is greater than or equal to the flow area of the flow passage.

[0058] Specifically, the plurality of flow holes 2122 are arranged at equal intervals along the circumferential direction of the spool 212. On one hand, when the spool 212 is in the first position, the hydraulic fluid flowing through the one-way throttle valve 21 can flow out uniformly along the circumferential direction of the spool 212. On the other hand, when the impurities in the hydraulic fluid block some of the flow holes 2122, the remaining flow holes 2122 still enable the one-way throttle valve 21 to work normally.

[0059] Therefore, the sum of the flow areas of the plurality of flow holes 2122 is greater than or equal to the flow area of the flow passage, so that when the spool 212 of the one-way throttle valve 21 is in the first position, the one-way throttle valve 21 does not form a local throttle.

[0060] In some embodiments, the ratio of the flow area of the throttle hole 2121 to the sum of the flow areas of the plurality of flow holes 2122 is greater than a first set ratio and less than a second set ratio.

[0061] Specifically, the ratio of the flow area of the throttle hole 2121 to the sum of the flow areas of the plurality of flow holes 2122 is greater than 1:5 and less than 1:3. Therefore, the ratio of the flow area of the one-way throttle valve 21 when the spool 212 of the one-way throttle valve 21 is in the first position to the flow area of the one-way throttle valve 21 when the spool 212 of the one-way throttle valve 21 is in the second position is greater than 1:5 and less than 1:3, so that the ratio of the inlet velocity of the rodless chamber 12 of the lifting cylinder 1 to the outlet velocity of the rodless chamber 12 of the lifting cylinder 1 is greater than 1:5 and less than 1:3, thereby stabilizing the lifting of the hydraulic support when the lifting device temporarily supports the hydraulic support.

[0062] In some embodiments, the flow passage includes a first port 2111 and a second port 2112. The first port 2111 is located at one end of the flow passage and on the side of the annular flange away from the spool 212. The first port 2111 is adapted to communicate with the rodless chamber 12 of the lifting cylinder 1. The second port 2112 is located at the other end of the flow passage. The second port 2112 is adapted to be connected to the liquid supply pipeline of the lifting device.

[0063] Specifically, the first port 2111 and the spool 212 are located on both sides of the annular flange along the axial direction of the spool 212. The second port 2112 and the annular flange are located on both sides of the spool 212 along the axial direction of the spool 212. When the spool 212 is in the second position, the spool 212 abuts against the side of the annular flange away from the first port 2111. When the spool 212 is in the first position, the spool 212 moves towards the second port 2112, so that the hydraulic fluid flows through the gap between the spool 212 and the annular flange, thereby increasing the flow area of the one-way throttle valve 21.

[0064] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are merely intended to facilitate the description of the present application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0065] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0066] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0067] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0068] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terminology "comprising" is used in the disclosure as comprising, but not limited to, any indicated features, integers, steps or components. It is also to be understood that the terminology "comprising" can be replaced by the terminology "consisting of" or "consisting essentially of" in some embodiments or examples.

[0069] Although the above-mentioned embodiments have been shown and described, it is to be understood that the above-mentioned embodiments are exemplary, and should not be understood as limiting the present disclosure, and the changes, modifications, replacements and variations of the above-mentioned embodiments made by those skilled in the art are within the protection scope of the present disclosure.

Claims

1. A hydraulic support hoist system, characterized by, The hydraulic support comprises: a hydraulic support; a bottom lifting device arranged on the lower side of the hydraulic support and adapted to temporarily support the hydraulic support when the hydraulic support moves, the bottom lifting device comprising a speed regulating assembly adapted to adjust the lifting speed of the bottom lifting device to make the landing process of the bottom lifting device smooth; the bottom lifting device comprises a bottom lifting cylinder, and the speed regulating assembly is connected with the rodless cavity of the bottom lifting cylinder to reduce the liquid inlet and outlet speed of the rodless cavity of the bottom lifting cylinder; the speed regulating assembly comprises a one-way throttling valve, which comprises: a valve body provided with a liquid passage, the liquid passage penetrates through the valve body along the axial direction of the valve body, and the liquid passage is internally provided with an annular flange; a valve core having an end face and an annular face, the annular face extends along the circumference of the end face, the annular face is provided with a flow hole, the extension direction of the flow hole penetrates through the valve core, and the extension direction of the flow hole and the axial direction of the valve body have an included angle, the end face is provided with a throttling hole, the extension direction of the throttling hole penetrates through the valve core, and the extension direction of the throttling hole and the axial direction of the valve body have an included angle; an elastic member acting between the valve core and the valve body and adapted to press the annular face against the annular flange to cut off the flow of the flow hole.

2. The hydraulic support hoist system of claim 1, wherein, The one-way throttling valve is connected with the rodless cavity of the bottom lifting cylinder, and the throttling area of the one-way throttling valve when the rodless cavity of the bottom lifting cylinder discharges liquid is smaller than the throttling area of the one-way throttling valve when the rodless cavity of the bottom lifting cylinder admits liquid.

3. The hydraulic support hoist system of claim 2, wherein, The speed regulating assembly further comprises a safety valve connected between the one-way throttling valve and the rodless cavity of the bottom lifting cylinder, and the safety valve is adapted to discharge hydraulic fluid when the pressure of the rodless cavity of the bottom lifting cylinder is greater than a set threshold.

4. The hydraulic support hoist system of claim 2, wherein, The one-way throttling valve has a safety assembly arranged at one end of the one-way throttling valve facing the bottom lifting cylinder, and the safety assembly is adapted to discharge hydraulic fluid when the pressure in the one-way throttling valve is greater than a set threshold.

5. The hydraulic support hoist system of claim 4, wherein, The annular face is a tapered face, the diameter of the tapered face gradually increases along the direction away from the end face to form an annular cavity at the outer circumferential side of the annular face, one end of the flow hole communicates with the annular cavity, and the annular cavity is isolated from the liquid passage when the annular face is pressed against the annular flange to reduce the flow area of the liquid passage.

6. The hydraulic support hoist system of claim 5, wherein, The flow hole has a plurality of flow holes, and the sum of the flow areas of the plurality of flow holes is greater than or equal to the flow area of the liquid passage.

7. The hydraulic support hoist system of claim 6, wherein, The ratio of the flow area of the throttling hole to the sum of the flow areas of the plurality of flow holes is greater than a first set ratio and less than a second set ratio.

8. The hydraulic support hoist system according to any one of claims 4-7, wherein, The liquid passage comprises a first port and a second port, the first port is located at one end of the liquid passage and on the side of the annular flange away from the valve core, the first port is adapted to communicate with the rodless cavity of the bottom lifting cylinder, and the second port is located at the other end of the liquid passage, and the second port is adapted to be connected with the liquid supply pipeline of the bottom lifting device.

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