Controllable throttle valve, push cylinder speed regulating system and speed regulating method thereof

Abstract

The embodiment of the present application provides a controllable throttle valve, a push-moving oil cylinder speed regulating system and a speed regulating method thereof, the controllable throttle valve comprises a valve body, a valve core and an elastic member, the valve body is provided with a first interface, a second interface and a control interface, the valve body is provided with a moving channel, the moving channel is communicated with the first interface, the second interface and the control interface, the valve core is provided with a throttling channel, and the valve core can move between a throttling position and a release position in the moving channel, in the throttling position, the first interface and the second interface are communicated only through the throttling channel, in the release position, the first interface and the second interface are communicated through the moving channel, the control interface is suitable for inputting control medium to make the valve core move from the release position to the throttling position under the pushing of the control medium, and the elastic member is located in the moving channel and is used for driving the valve core to move from the release position to the throttling position. The controllable throttle valve of the embodiment of the present application has the advantages that the throttling effect is controlled by controlling the position of the valve core.

Description

Technical Field

[0001] This invention relates to the field of mining equipment technology, specifically to a controllable throttle valve, a push cylinder speed regulation system, and a speed regulation method thereof. Background Technology

[0002] In related technologies, a throttle valve has a stepped channel inside the valve body. The two ends of the channel have a first interface and a second interface. A movable valve core is provided inside the channel. The end of the valve core facing the first interface has a throttling orifice and a flow passage. A spring is fitted around the valve core to provide a force toward the first interface. When the medium at the first interface has no pressure or the pressure is less than the spring force, the first interface and the second interface are connected through the throttling orifice. When the medium pressure at the first interface increases, the valve core moves toward the second interface. At this time, the first interface and the second interface are simultaneously connected through the throttling orifice and the flow passage, thereby achieving the throttling effect through the medium pressure at the first interface and the spring.

[0003] However, in related technologies, the throttling effect of the throttling valve only exists at the initial time when the medium is introduced into the throttling valve from the first interface and is uncontrolled. Summary of the Invention

[0004] This invention is based on the inventor's discoveries and understanding of the following facts and problems:

[0005] Hydraulic supports are support devices used to control mine pressure in coal mining faces. During operation, hydraulic supports require pushing and pulling actions. To prevent damage from impacts during these actions, related technologies incorporate throttle valves to control the movement speed of the pushing cylinders, achieving a buffering effect through the throttling effect of the valves.

[0006] However, the structure of the throttle valve in the relevant technology means that the throttling effect it produces only exists for a short initial time when the medium is introduced into the throttle valve from the first interface, and it is uncontrollable. Therefore, it is impossible to control the speed of the hydraulic support when it moves by controlling the throttling effect of the throttle valve, resulting in low control accuracy of the hydraulic support.

[0007] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention provide a controllable throttling valve, which has the advantage of controlling the throttling effect by controlling the position of the valve core.

[0008] Embodiments of the present invention also propose a speed regulation system for a push-type hydraulic cylinder.

[0009] The controllable throttle valve of this invention includes:

[0010] The valve body has a first interface, a second interface, and a control interface on its outer wall surface. The valve body also has a moving channel extending along the extension direction of the valve body inside, and the moving channel is connected to the first interface, the second interface, and the control interface.

[0011] A valve core, one end of which is provided with a throttling channel, is disposed within the moving channel, and is movable relative to the valve body along the extension direction of the valve body between a throttling position and a release position. In the throttling position, the first interface and the second interface are connected only through the throttling channel. In the release position, the first interface and the second interface are connected through the moving channel. The control interface is adapted to be supplied with a control medium so that the valve core moves from the release position to the throttling position under the push of the control medium.

[0012] An elastic element located within the movement channel for driving the valve core to move from the release position to the throttling position.

[0013] The controllable throttle valve of this invention has a control interface on the valve body that communicates with the moving channel. By introducing or discharging control medium into the moving channel through the control interface, the position of the valve core in the moving channel is limited, thereby controlling the throttling effect and the duration of the throttling effect of the controllable throttle valve.

[0014] In some embodiments, the throttling channel includes a throttling blind orifice and a throttling orifice that are connected to each other. The throttling blind orifice is disposed on the end face of the valve core, and the throttling orifice is disposed on the outer wall surface of the valve core. The equivalent diameter of the throttling orifice is smaller than the equivalent diameter of the throttling blind orifice. At the throttling position, the first interface is connected to the throttling blind orifice, and the second interface is connected to the throttling orifice.

[0015] In some embodiments, the valve body is provided with a first chamber and a second chamber, the first chamber is connected to the first interface, the second chamber is connected to the second interface, the first chamber and the moving channel extend along a first direction and are sequentially connected, the throttling blind orifice extends along the first direction, the second chamber extends along a second direction and is connected to the moving channel, the second direction forms an angle with the first direction, and the throttling orifice extends along the second direction.

[0016] In some embodiments, the outer wall surface of the valve core is provided with a first sealing surface arranged around the center line of the valve core, and the valve body is provided with a second sealing surface arranged around the center line of the moving channel. The second sealing surface is located between the connection between the first interface and the moving channel and the connection between the second interface and the moving channel. In the throttling position, the first sealing surface abuts against the second sealing surface.

[0017] In some embodiments, the controllable throttle valve further includes a sealing ring connected between the outer wall surface of the valve core and the inner wall surface of the moving channel, and the sealing ring is located between the connection point of the control interface and the moving channel and the connection point of the first interface and the moving channel, and the connection point of the second interface and the moving channel.

[0018] In some embodiments, a limiting blind hole is provided on the end face of the other end of the valve core, and a portion of the elastic element is disposed in the limiting blind hole, wherein the cross-sectional area of ​​the limiting blind hole is larger than the cross-sectional area of ​​the throttling blind hole.

[0019] In some embodiments, the controllable throttle valve further includes a plug, the plug including a connected connecting seat and the limiting member, the connecting seat being detachably connected to the valve body, and the limiting member being located within the moving channel. In the released position, the valve core abuts against the limiting member, and the valve core is located on the side facing the first interface and the second interface at the connection between the control interface and the moving channel. The elastic member is sleeved on the limiting member and abuts against the connecting seat, and the outer peripheral dimension of the elastic member is adapted to the circumferential dimension of the limiting blind hole.

[0020] The speed control system for the push cylinder in this embodiment of the invention includes:

[0021] A pusher cylinder, wherein the pusher cylinder is provided with a rod chamber and a rodless chamber;

[0022] A controllable throttle valve, wherein the controllable throttle valve is the controllable throttle valve described in any of the above embodiments, and one of the first interface and the second interface is connected to the rodless cavity;

[0023] The liquid storage container is connected to the other of the first and second interfaces via a first reversing valve, the liquid storage container is connected to the control interface via a second reversing valve, and the liquid storage container is connected to the rod chamber via a third reversing valve.

[0024] The push cylinder speed control system of the present invention has a controllable throttle valve, so the speed control of the extension or retraction of the push cylinder can be controlled by controlling the throttling effect and the duration of the throttling effect of the controllable throttle valve, thereby improving the control accuracy of the push cylinder.

[0025] In some embodiments, each of the first, second, and third directional valves is provided with a first valve port, a second valve port, and a third valve port. The first valve ports of the first, second, and third directional valves are respectively connected to the liquid storage container via corresponding booster pumps. The third valve ports of the first, second, and third directional valves are respectively connected to the liquid storage container. The second valve port of the first directional valve is connected to the other of the first interface and the second interface. The second valve port of the second directional valve is connected to the control interface. The second valve port of the third directional valve is connected to the rod chamber.

[0026] The speed regulation method of the push cylinder speed regulation system based on any of the above embodiments of the present invention includes a speed regulation method when the push cylinder is extending and a speed regulation method when the push cylinder is retracting.

[0027] The speed adjustment method during the extension action includes:

[0028] The second reversing valve is opened to allow the medium in the liquid storage container to enter the control interface as the control medium, and the valve core is positioned in the throttling position.

[0029] Open the first reversing valve to allow the medium in the liquid storage container to flow through the second interface, the throttling channel and the first interface into the rodless chamber;

[0030] The flow direction of the second reversing valve is reversed so that the control medium flows back from the control opening to the liquid storage container, and the valve core is moved from the throttling position to the release position;

[0031] The speed adjustment method during the contraction action includes:

[0032] When the second reversing valve is in the open state and the valve core is in the throttling position, the third reversing valve is opened to allow the medium in the liquid storage container to enter the rod chamber.

[0033] The flow direction of the second reversing valve is reversed so that the medium flows back from the control opening to the liquid storage container, and the valve core is moved from the throttling position to the release position.

[0034] The speed regulation method of this invention can control the moving speed of the push cylinder. Attached Figure Description

[0035] Figure 1 This is a cross-sectional view of the valve body of the controllable throttle valve according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the valve body of the controllable throttle valve according to an embodiment of the present invention;

[0037] Figure 3 This is a cross-sectional view of the valve core of the controllable throttle valve according to an embodiment of the present invention;

[0038] Figure 4 This is a schematic diagram of the valve core of the controllable throttle valve according to an embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of the screw plug of the controllable throttle valve according to an embodiment of the present invention;

[0040] Figure 6 This is a cross-sectional view of the controllable throttle valve in the throttle position according to an embodiment of the present invention;

[0041] Figure 7 This is a cross-sectional view of the controllable throttle valve in the release position according to an embodiment of the present invention;

[0042] Figure 8 This is a schematic diagram of the speed regulation system of the push cylinder according to an embodiment of the present invention.

[0043] Figure label:

[0044] 100. Controllable throttle valve; 1. Valve body; 11. First interface; 12. Second interface; 13. Control interface; 14. Movement channel; 141. Flow chamber; 142. Hydraulic control chamber; 15. First chamber; 16. Second chamber; 17. Third chamber; 18. Marking port; 19. Bolt hole; 2. Valve core; 21. Throttling channel; 211. Throttling blind hole; 212. Throttling orifice; 22. Limiting blind hole; 23. First sealing surface; 3. Elastic element; 4. Sealing ring; 5. Screw plug; 51. Limiting element; 52. Connecting seat;

[0045] 200. Push cylinder; 201. Rod chamber; 202. Rodless chamber; 300. Liquid storage container; 400. First directional valve; 500. Second directional valve; 600. Third directional valve; 700. Booster pump; 800. Relief valve; 900. Accumulator; 1000. Pressure gauge. Detailed Implementation

[0046] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0047] The following is a reference appendix. Figure 1 - Appendix Figure 8 The invention describes a controllable throttle valve, a push cylinder speed control system, and a speed control method thereof according to embodiments of the invention.

[0048] like Figures 1-7 As shown, the controllable throttle valve 100 of this embodiment includes a valve body 1, a valve core 2, and an elastic element 3.

[0049] The outer wall of the valve body 1 is provided with a first interface 11, a second interface 12 and a control interface 13. The interior of the valve body 1 is provided with a moving channel 14 extending along the extension direction of the valve body 1. The moving channel 14 is connected to the first interface 11, the second interface 12 and the control interface 13.

[0050] Specifically, such as Figure 1 and Figure 2 As shown, the moving channel 14 is located inside the valve body 1 and extends vertically. A first interface 11 communicating with the moving channel 14 is located above it. A second interface 12 and a control interface 13 communicating with the moving channel 14 are located on the left side of the moving channel 14. The second interface 12 and the control interface 13 are spaced apart vertically. The control interface 13 is used for the inlet and outlet of the control medium, and the first interface 11 and the second interface 12 are used for the inlet and outlet of the flowing medium. In other words, the first interface 11 can be used as the inlet of the flowing medium and the second interface 12 can be used as the outlet of the flowing medium, or the first interface 11 can be used as the outlet of the flowing medium and the second interface 12 can be used as the inlet of the flowing medium, so that the flow direction of the flowing medium through the controllable throttle valve can be changed. The first interface 11, the second interface 12 and the control interface 13 adopt mining quick-connect interface, and the orifice of the control interface 13 is smaller than the orifice of the first interface 11 and the second interface 12.

[0051] It is understood that the valve body and the moving channel are not limited to extending in the vertical direction. In other embodiments, the valve body and the moving channel may also have a certain curvature. The positions of the first interface, the second interface, and the control interface relative to the moving channel are not limited to the positions described above. In other embodiments, the first interface, the second interface, and the moving channel are arranged in a Y-shape, with the control interface located in the extending direction of the moving channel.

[0052] One end of the valve core 2 is provided with a throttling channel 21. The valve core 2 is located in the moving channel 14, and the valve core 2 can move between the throttling position and the release position relative to the valve body 1 along the extension direction of the valve body 1. In the throttling position, the first interface 11 and the second interface 12 are connected only through the throttling channel 21. In the release position, the first interface 11 and the second interface 12 are connected through the moving channel 14. The control interface 13 is adapted to be supplied with a control medium so that the valve core 2 moves from the release position to the throttling position under the push of the control medium.

[0053] Specifically, such as Figure 3 and Figure 4 As shown, the upper end of the valve core 2 is provided with a throttling channel 21. Figure 6As shown, valve core 2 is in the throttling position. At this time, valve core 2 is located between the first interface 11 and the second interface 12. The first interface 11 and the second interface 12 are blocked by valve core 2 and cannot be connected through the moving channel 14; they can only be connected through the throttling channel 21. Since the equivalent diameter of the throttling channel 21 is necessarily smaller than the equivalent diameter of the moving channel 14, valve core 2 has a throttling effect when in the throttling position, and the throttling effect is optimal. Figure 7 As shown, valve core 2 is in the release position. At this time, valve core 2 is away from the first interface 11 and the second interface 12. The first interface 11 and the second interface 12 are only connected through the moving channel 14. Therefore, valve core 2 no longer has a throttling effect when it is in the release position. Control interface 13 is connected to a portion of the space in the moving channel 14 located below valve core 2. By introducing control medium into this portion of space through control interface 13, the control medium will apply pressure to valve core 2 to move it from the release position to the throttling position. Thus, the position of valve core 2 can be controlled by controlling the amount or pressure of the control medium.

[0054] It is understood that in some other embodiments, when the valve core is in the release position, the first interface and the second interface can also be connected simultaneously through the moving channel and the throttling channel. Since the portion of the moving channel used to connect the first interface and the second interface between the release position and the throttling position is smaller than the portion of the moving channel connecting the first interface and the second interface in the release position, the release position still does not have a throttling effect.

[0055] The elastic element 3 is located within the moving channel 14 to drive the valve core 2 to move from the release position to the throttling position. Specifically, as shown... Figure 6 and Figure 7 As shown, the elastic element 3 is a spring, located within the moving channel 14 and below the valve core 2. One end of the elastic element 3 abuts against the valve core 2, thereby driving the valve core 2 to move from the release position to the throttling position. It is understood that in other embodiments, the spring can also drive the valve core to move from the release position to the throttling position by the tension force of the spring returning to its extended state; the elastic element is not limited to a spring, and in other embodiments, the elastic element can also be an elastic rubber element.

[0056] The controllable throttle valve of this invention has at least the following two states during use:

[0057] The first state is as follows: When no medium is supplied to the first port 11, the second port 12, and the control port 13, the valve core 2 is in the throttling position under the elastic force of the elastic element 3. At this time, if the pressure of the flowing medium supplied to the first port 11 or the second port 12 is less than the elastic force of the elastic element 3, the flowing medium is in the optimal throttling effect. When the pressure of the flowing medium supplied is greater than the elastic force of the elastic element 3, the valve core 2 receives the pressure of the flowing medium and moves from the throttling position to the release position, and the throttling effect gradually decreases.

[0058] The second state is as follows: when the control interface 13 is supplied with the control medium, and the sum of the pressure provided by the control medium to the valve core 2 and the elastic force of the elastic element 3 is greater than the pressure of the flowing medium, if the valve core 2 is in the release position, the valve core 2 will move to the throttling position after the control medium is supplied; if the valve core 2 is in the throttling position, the valve core 2 will always be in the throttling position under the pressure of the flowing medium.

[0059] It is understood that the state of the controllable throttle valve during use is not limited to the two mentioned above. In other embodiments, under the premise of obtaining the pressure of the flowing medium and the elastic force of the spring, the valve core can be maintained at a certain position between the throttling position and the release position by controlling the pressure of the control medium, so that the throttling effect is maintained at a fixed flow rate, and the position of the valve core and the flow rate of the flowing medium can be adjusted by changing the pressure of the control medium.

[0060] Therefore, the controllable throttle valve of this embodiment of the invention has a control interface on the valve body that communicates with the moving channel. By introducing or discharging control medium into the moving channel through the control interface, the position of the valve core in the moving channel is limited, thereby controlling the throttling effect and the duration of the throttling effect of the controllable throttle valve.

[0061] In some embodiments, the throttling channel 21 includes a throttling blind hole 211 and a throttling orifice 212 that are connected to each other. The throttling blind hole 211 is disposed on the end face of the valve core 2, and the throttling orifice 212 is disposed on the outer wall surface of the valve core 2. The equivalent diameter of the throttling orifice 212 is smaller than the equivalent diameter of the throttling blind hole 211. In the throttling position, the first interface 11 is connected to the throttling blind hole 211, and the second interface 12 is connected to the throttling orifice 212.

[0062] like Figure 3 and Figure 6 As shown, the throttling blind orifice 211 extends from top to bottom on the upper end face of the valve core 2, and the throttling orifice 212 extends in the left-right direction and communicates with the throttling blind orifice 211. Both the throttling blind orifice 211 and the throttling orifice 212 are round holes. The diameter of the throttling blind orifice 211 is larger than the diameter of the throttling orifice 212. When a flowing medium is introduced into the first interface 11 and the second interface 12, part of the flowing medium accumulates in the throttling blind orifice 211 and provides pressure to the valve core 2, so that the valve core 2 is better subjected to the pressure of the flowing medium and moves to the release position. Of course, the end face of the valve core 2 is also subjected to the pressure provided by the flowing medium.

[0063] It is understood that the throttling channel is not limited to including a throttling blind orifice and a throttling orifice. In other embodiments, the throttling channel can be a straight orifice or a curved orifice, in which case the pressure of the flowing medium is applied to the end face of the valve core to drive the valve core to move to the release position. The throttling blind orifice and the throttling orifice are not limited to the first interface communicating with the throttling blind orifice and the second interface communicating with the throttling orifice. In other embodiments, the first interface, the second interface, and the moving channel are arranged in a Y-shape. In this case, the throttling blind orifice extends along the extension direction of the moving channel, one throttling orifice connects the throttling blind orifice and the first interface, and the other throttling orifice connects the throttling blind orifice and the second interface. In other words, the throttling blind orifice and the two throttling orifices of the throttling channel are arranged in a Y-shape.

[0064] In some embodiments, the valve body 1 is provided with a first chamber 15 and a second chamber 16. The first chamber 15 is connected to a first interface 11, and the second chamber 16 is connected to a second interface 12. The first chamber 15 and the moving channel 14 are connected along a first direction (e.g., Figure 1 The throttling blind orifice 211 extends along the first direction (as shown in the vertical direction) and is connected sequentially. The second chamber 16 extends along the second direction (as shown in the vertical direction). Figure 1 The second direction (as shown in the left and right directions) extends and connects to the moving channel 14, forming an angle with the first direction, and the throttle orifice 212 extends along the second direction.

[0065] like Figure 1 As shown, the first chamber 15 and the moving channel 14 extend in the vertical direction, and the second chamber 16 extends in the horizontal direction. In other words, the angle between the extending direction of the second chamber 16 and the extending direction of the first chamber 15 and the moving channel 14 is 90°, which facilitates processing.

[0066] The valve body is provided with a first chamber and a second chamber, which allow the flowing medium to accumulate in the first chamber and the second chamber, thereby enabling better pressure to be applied to the valve core. The first chamber, the moving channel, and the throttling blind orifice all extend in the vertical direction, so that the direction in which the flowing medium in the first chamber and the throttling blind orifice applies pressure to the valve core is along the extension direction of the moving channel. Therefore, the valve core can be driven to move from the throttling position to the release position more smoothly.

[0067] It is understood that in some other embodiments, the valve body may not have a first chamber and a second chamber, and the first interface and the second interface may be directly connected to the moving channel.

[0068] It is understood that the angle between the extension direction of the second chamber and the extension direction of the first chamber and the moving channel is not limited to 90°. In other embodiments, the angle may also be an acute angle, such as 60°.

[0069] In some embodiments, the outer wall surface of the valve core 2 is provided with a first sealing surface 23 arranged around the center line of the valve core 2, and the valve body 1 is provided with a second sealing surface arranged around the center line of the moving channel 14. The second sealing surface is located between the connection between the first interface 11 and the moving channel 14 and the connection between the second interface 12 and the moving channel 14. In the throttling position, the first sealing surface 23 abuts against the second sealing surface.

[0070] like Figure 3 and Figure 4 As shown, the valve core 2 is a cylinder, and its outer circumferential surface is a stepped shape transitioning with a slope. The outer circumferential dimension of the upper side of the valve core 2 is smaller than that of the lower side. A first sealing surface 23, formed by a chamfer, is formed between the upper end face and the outer circumferential surface of the valve core 2. Figure 6 As shown, a second sealing surface is provided on the inner circumferential surface of the forming moving channel 14 of the valve body 1. The second sealing surface is located between the connection between the first interface 11 and the moving channel 14 and the connection between the second interface 12 and the moving channel 14. The second sealing surface is adapted to the first sealing surface 23. In the throttling position, the second sealing surface and the first sealing surface 23 abut against each other to form an annular sealing band, so that the first interface 11 and the second interface 12 are connected only through the throttling channel 21 and cannot be connected through the moving channel 14.

[0071] It is understood that in other embodiments, the valve core 2 may also be a prism, with the inner wall surface of the valve body 1 matching the outer wall surface of the valve core 2.

[0072] It is understood that the structure of the first sealing surface and the second sealing surface is not limited to the inclined conical surface formed by chamfering. In other embodiments, the first sealing surface may also be a conical surface or a stepped surface disposed in the middle of the outer peripheral surface of the valve core, and the second sealing surface is adapted to the first sealing surface. In other embodiments, the first sealing surface and the second sealing surface may not be additionally provided, and the outer peripheral surface of the valve core may abut against the inner peripheral surface forming the moving channel, or the upper end surface of the valve core may abut against the end surface at the connection between the first interface and the moving channel so that the first interface and the second interface are connected only through the throttling channel.

[0073] In some embodiments, the controllable throttle valve 100 of the present invention further includes a sealing ring 4, which is connected between the outer wall surface of the valve core 2 and the inner wall surface of the moving channel 14. The sealing ring 4 is located between the connection between the control interface 13 and the moving channel 14 and the connection between the first interface 11 and the moving channel 14, and the connection between the second interface 12 and the moving channel 14.

[0074] like Figure 6 and Figure 7As shown, the inner circumferential surface of the forming moving channel 14 of the valve body 1 is provided with an annular groove surrounding the moving channel 14. The annular sealing ring 4 is embedded in the annular groove. The sealing ring 4 is located simultaneously between the connection between the control interface 13 and the moving channel 14 and the connection between the first interface 11 and the moving channel 14, and between the connection between the control interface 13 and the moving channel 14 and the connection between the second interface 12 and the moving channel 14. In other words, the connection between the first interface 11 and the moving channel 14, the connection between the second interface 12 and the moving channel 14, and the connection between the sealing ring 4 and the control interface 13 and the moving channel 14 are arranged sequentially from top to bottom. When the valve core 2 is in the throttling position and the release position, the inner circumferential surface of the sealing ring 4 is always... The sealing ring 4 abuts against the outer peripheral surface of the valve core 2, thereby dividing the moving channel into a flow chamber 141 and a hydraulic control chamber 142. The flow medium entering the moving channel 14 through the first interface 11 and the second interface 12 is always located in the flow chamber 141 due to the obstruction of the sealing ring 4. In other words, when the valve core 2 is in the release position, the first interface 11 and the second interface 12 are connected through the flow chamber 141, so that the flow medium can generate pressure in the flow chamber 141 to drive the valve core 2 to move to the release position. The control medium entering the moving channel 14 through the control interface 13 is always located in the hydraulic control chamber 142 due to the obstruction of the sealing ring 4, so that the control medium can generate pressure in the hydraulic control chamber 142 to drive the valve core 2 to move to the throttling position.

[0075] It is understood that in other embodiments, the sealing ring may also be embedded on the outer peripheral surface of the valve core, or no sealing ring may be provided.

[0076] In some embodiments, a limiting blind hole 22 is provided on the end face of the other end of the valve core 2, and a portion of the elastic member 3 is provided in the limiting blind hole 22. The cross-sectional area of ​​the limiting blind hole 22 is greater than the cross-sectional area of ​​the throttling blind hole 211.

[0077] like Figure 3 , Figure 6 and Figure 7 As shown, the lower end of the valve core 2 is provided with a limiting blind hole 22, which extends from bottom to top. The axis of the limiting blind hole 22 coincides with that of the throttling blind hole 211, but the limiting blind hole 22 and the throttling blind hole 211 are not connected. Part of the elastic element 3 is located inside the limiting blind hole 22, which can prevent the elastic element from rubbing against the sealing ring when the top of the elastic element is higher than the sealing ring, thus avoiding damage to the sealing ring. The cross-sectional area of ​​the limiting blind hole 22 is larger than that of the throttling blind hole 211. Under the same pressure conditions, the pressure of the control medium at the lower end of the valve core 2 is greater than that of the flow medium at the upper end. At the same time, with the elastic force of the elastic element 3, the valve core 2 will be driven to move from the release position to the throttling position, and then fixed in the throttling position to achieve the throttling effect.

[0078] It is understandable that in some other embodiments, the limiting blind hole may not be provided. On the one hand, by adjusting the size of the valve core in the vertical direction, the upper end of the elastic element is still located below the sealing ring when the valve core is in the throttling position. On the other hand, the pressure of the flowing medium is different from the pressure of the control medium. When the pressure of the control medium is greater than the sum of the pressure of the flowing medium and the spring force, the valve core will be driven to move from the release position to the throttling position and then be fixed in the throttling position.

[0079] In some embodiments, the controllable throttle valve 100 of the present invention further includes a screw plug 5, which includes a connecting seat 52 and a limiting member 51 connected together. The connecting seat 52 is detachably connected to the valve body 1, and the limiting member 51 is located in the moving channel 14. In the released position, the valve core 2 abuts against the limiting member 51, and the valve core 2 is located on the side facing the first interface 11 and the second interface 12 at the connection between the control interface 13 and the moving channel 14. The elastic member 3 is sleeved on the limiting member 51 and abuts against the connecting seat 52. The outer peripheral dimension of the elastic member 3 is adapted to the circumferential dimension of the limiting blind hole 22.

[0080] like Figure 5 , Figure 6 and Figure 7 As shown, the valve body 1 is provided with a threaded hole, which communicates with the moving channel 14 and is located below the moving channel 14. The screw plug 5 includes a connected connecting seat 52 and a limiting member 51. The outer peripheral surface of the connecting seat 52 is provided with an external thread that matches the threaded hole, so that the screw plug 5 is detachably connected to the valve body 1. Thus, the elastic element 3 and the valve core 2 can be removed from the moving channel 14 by removing the screw plug 5, so that the elastic element 3 and the valve core 2 can be replaced and repaired, and the moving channel 14 can also be cleaned. The limiting member 51 is a cylindrical rod extending in the vertical direction. When the valve core 2 is in the throttling position, it is located above the limiting member 51 and has a certain distance from the limiting member 51. When the valve core 2 is in the release position, it is located above the limiting member 51 and abuts against the limiting member 51. The valve core 2 is located above the connection between the control interface 13 and the moving channel 14, so that the control interface 13 is connected to the hydraulic control chamber 142. Thus, the control medium can be introduced into the hydraulic control chamber 142 through the control interface 13 to drive the valve core 2 to move to the throttling position. The elastic member 3 is a spring, and the limiting blind hole 22 is a round hole. The outer diameter of the elastic member 3 is adapted to the diameter of the limiting blind hole 22. Thus, the limiting blind hole 22 and the limiting member 51 limit the elastic member 3, so that the elastic member 3 deforms in the vertical direction.

[0081] The limiting component restricts the release position of the valve core, ensuring the stability of the flow rate of the flowing medium when the valve core is in the release position. This, in turn, ensures the stability of the maximum moving speed of the push cylinder when the controllable throttle valve is used to connect to the push cylinder.

[0082] It is understood that the structure of the limiting member is not limited to a limiting rod. In other embodiments, the limiting member may also be a boss provided on the inner circumferential surface of the valve body that forms the moving channel.

[0083] It is understood that in some other embodiments, the connecting seat 52 and the valve body 1 may not be connected by threads.

[0084] Of course, controllable throttle valves may not have limiting components. In some other embodiments, when the control interface is located directly below the valve core, in other words, when the control interface is located on the inner end face of the valve body forming the moving channel, limiting components may not be required; or when the valve core has an opening for connecting the control interface and the hydraulic control chamber in the release position, limiting components may not be required.

[0085] It is understood that the controllable throttle valve is not limited to limiting the elastic element through a limiting blind hole and a limiting element. In other embodiments, the outer peripheral dimension of the elastic element is adapted to the circumferential dimension of the moving channel.

[0086] It is understood that the controllable throttle valve may also be without a plug. In other embodiments, the plug is an integral structure with the valve body. In this case, the valve body has a slit extending in the vertical direction and passing through the movement channel. The slit divides the valve body into two separable parts orthogonal to the vertical direction. These two parts are detachably connected by bolts and gaskets.

[0087] In some embodiments, the valve body 1 is provided with a third chamber 17, which extends in the left-right direction to connect the control interface 13 and the moving channel 14.

[0088] In some embodiments, in order to distinguish between the second interface 12 and the control interface 13 provided on the left end face of the valve body 1, marking ports 18 located on both sides of the control interface 13 are provided on the left end face of the valve body 1.

[0089] In some embodiments, to facilitate the installation of the controllable throttle valve 100, a bolt hole 19 is provided on the valve body 1 through it.

[0090] like Figure 8 As shown, the speed control system of the push cylinder in this embodiment of the invention includes a push cylinder 200, a controllable throttle valve 100, and a liquid storage container 300. The push cylinder 200 is provided with a rod chamber 201 and a rodless chamber 202. The controllable throttle valve 100 is the controllable throttle valve 100 of this embodiment of the invention. One of the first interface 11 and the second interface 12 is connected to the rodless chamber 202. The liquid storage container 300 is connected to the other of the first interface 11 and the second interface 12 through a first reversing valve 400. The liquid storage container 300 is connected to the control interface 13 through a second reversing valve 500. The liquid storage container 300 is connected to the rod chamber 201 through a third reversing valve 600.

[0091] Specifically, such as Figure 8 As shown, the first interface 11 is connected to the rodless chamber 202, and the second interface 12 is connected to the liquid storage container 300 through the first directional valve 400. Both the flowing medium and the control medium are liquid media in the liquid storage container 300, such as hydraulic oil. Of course, in some other embodiments, the first interface 11 may be connected to the liquid storage container 300 through the first directional valve 400, and the second interface 12 may be connected to the rodless chamber 202.

[0092] The push cylinder speed control system of the present invention has a controllable throttle valve, so the speed control of the extension or retraction of the push cylinder can be controlled by controlling the throttling effect and the duration of the throttling effect of the controllable throttle valve, thereby improving the control accuracy of the push cylinder. When the push cylinder speed control system of the present invention is used to drive the hydraulic support, it can improve the control accuracy of the hydraulic support.

[0093] In some embodiments, each of the first reversing valve 400, the second reversing valve 500, and the third reversing valve 600 is provided with a first valve port, a second valve port, and a third valve port. The first valve ports of the first reversing valve 400, the second reversing valve 500, and the third reversing valve 600 are respectively connected to the liquid storage container 300 through the corresponding booster pump 700. The third valve ports of the first reversing valve 400, the second reversing valve 500, and the third reversing valve 600 are respectively connected to the liquid storage container 300. The second valve port of the first reversing valve 400 is connected to the other of the first interface 11 and the second interface 12. The second valve port of the second reversing valve 500 is connected to the control interface 13. The second valve port of the third reversing valve 600 is connected to the rod chamber 201.

[0094] like Figure 8 As shown, the pipeline connecting the second valve port of the first reversing valve 400 to the second interface 12 is also connected to the liquid storage container 300 through an overflow valve 800. An accumulator 900 and a pressure gauge 1000 are provided between the second valve port of the first reversing valve 400 and the second interface 12. The pipeline connecting the second valve port of the second reversing valve 500 to the control interface 13 is also connected to the liquid storage container 300 through another overflow valve 800. Another accumulator 900 and another pressure gauge 1000 are provided between the second valve port of the second reversing valve 500 and the control interface 13. The pipeline connecting the second valve port of the third reversing valve 600 to the rod chamber 201 is connected to the liquid storage container 300 through a third overflow valve 800.

[0095] The method of using the speed regulating system of the push cylinder in this embodiment of the invention includes a speed regulating method for the push cylinder 200 during its extension action and a speed regulating method for the push cylinder 200 during its retraction action, wherein the speed regulating method during the extension action includes:

[0096] Open the second directional valve 500, for example, by moving the handle of the second directional valve 500 to the lower position, so that the medium in the liquid storage container 300 enters the control interface 13 as the control medium under the action of the booster pump 700, and the valve core 2 is in the throttling position.

[0097] Open the first directional valve 400, for example, by moving the handle of the first directional valve 400 to the lower position, so that the medium in the liquid storage container 300, as the flowing medium, enters the rodless chamber 202 through the second port 12, the throttling channel 21, and the first port 11 under the action of the booster pump 700. At this time, the valve core 2 is always in the throttling position due to the pressure of the control medium. Therefore, the first port 11 and the second port 12 are only connected through the throttling channel 21, and the flowing medium enters the rodless chamber 202 at a small flow rate, causing the push cylinder 200 to extend slowly.

[0098] The flow direction of the second directional valve 500 is reversed, for example, by moving the handle of the second directional valve 500 to the upper position, so that the control medium flows back from the control interface 13 to the liquid storage container 300, and the valve core 2 moves from the throttling position to the release position. When the control medium flows back from the control interface 13 to the liquid storage container 300, the valve core 2 is no longer under the pressure of the control medium. Therefore, under the pressure of the flowing medium, the valve core 2 begins to move from the throttling position to the release position, and finally reaches the release position. At this time, the flow rate of the flowing medium gradually increases and eventually becomes the maximum flow rate when the valve core 2 is in the release position. In other words, the throttling effect of the controllable throttling valve 100 gradually decreases until it disappears. Therefore, the extension speed of the push cylinder 200 gradually increases and eventually reaches the maximum speed.

[0099] The speed adjustment methods during contraction include:

[0100] When the second directional valve 500 is open and the valve core 2 is in the throttling position, for example, when the handle of the second directional valve 500 is in the lower position, the third directional valve 600 is opened to allow the medium in the reservoir 300 to enter the rod chamber 201. For example, by moving the handle of the third directional valve 600 to the lower position, the medium in the reservoir 300 enters the rod chamber 201 under the action of the booster pump 700. When the medium in the reservoir 300 enters the rod chamber 201, the pressure in the rod chamber 201 pushes the piston rod to move and compress the rodless chamber 202. The flowing medium in the rodless chamber 202 flows back to the reservoir 300 through the controllable throttle valve 100. Since the pressure of the control medium at this time limits the valve core 2 to the throttling position, the flowing medium in the rodless chamber 202 can only flow back at a small flow rate through the throttling channel 21, causing the push cylinder 200 to contract slowly.

[0101] The flow direction of the second directional valve 500 is reversed, for example, by moving the handle of the second directional valve 500 to the upper position, so that the control medium flows back from the control interface 13 to the liquid storage container 300, and the valve core 2 moves from the throttling position to the release position. When the handle of the second directional valve 500 is moved to the upper position, the control medium flows back from the control interface 13 to the liquid storage container 300, the valve core 2 loses the pressure of the control medium and moves from the throttling position to the release position, the speed of the backflow of the flowing medium in the rodless chamber 202 gradually increases until it reaches the maximum speed when the valve core 2 is in the release position, so the contraction speed of the push cylinder 200 gradually increases until it reaches the maximum speed.

[0102] When the booster pump 700 corresponding to the first interface 11 and the second interface 12 is in a stopped or standby state, in other words, the flowing medium does not enter the controllable throttle valve 100, and the valve core 2 and the push cylinder 200 do not move regardless of the position of the first reversing valve 400 and the second reversing valve 500.

[0103] Therefore, the push cylinder speed control system of the present invention can realize the control of the moving speed of the push cylinder, especially the control of the duration of the throttling speed and the time point when the throttling speed changes to the release speed, wherein the throttling speed is the speed of the valve core when it is in the throttling position and the release speed is the speed of the valve core when it is in the release position.

[0104] In other embodiments, in the speed control method during the extension action, after changing the flow direction of the second directional valve to allow the control medium to flow back from the control interface to the reservoir and moving the valve core from the throttling position to the release position, the flow direction of the second directional valve can be changed again. For example, the handle of the second directional valve can be moved to the lower position to move the valve core from the release position to the throttling position, so that the push cylinder, after extending at maximum speed for a period of time, switches back to extending at a slow throttling speed. This is to avoid collisions with the hydraulic support.

[0105] In other embodiments, in the speed control method during the contraction action, after changing the flow direction of the second directional valve to allow the control medium to flow back from the control interface to the reservoir and moving the valve core from the throttling position to the release position, the flow direction of the second directional valve can be changed again. For example, the handle of the second directional valve can be moved to the lower position to move the valve core from the release position to the throttling position, so that the push cylinder, after contracting at maximum speed for a period of time, switches back to contracting at a slow throttling speed. This is to avoid collisions with the hydraulic support.

[0106] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0107] Furthermore, the terms "first" and "second" are used only to distinguish features and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0108] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0109] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0110] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0111] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A controllable throttle valve, characterized in that, include: The valve body (1) has a first interface (11), a second interface (12) and a control interface (13) on its outer wall surface. The valve body (1) has a moving channel (14) extending along the extension direction of the valve body (1) inside. The moving channel (14) is connected to the first interface (11), the second interface (12) and the control interface (13). A valve core (2) is provided with a throttling channel (21) at one end. The valve core (2) is located in the moving channel (14), and the valve core (2) can move between a throttling position and a release position relative to the valve body (1) along the extension direction of the valve body (1). The throttling channel (21) includes a throttling blind hole (211) and a throttling hole (212) that are connected to each other. The throttling blind hole (211) is located on the end face of the valve core (2), and the throttling hole (212) is located on the outer wall surface of the valve core (2). The equivalent diameter of the throttling hole (212) is smaller than the equivalent diameter of the throttling blind hole (211). In the throttling position, the first interface (11) is connected to the throttling blind hole (211), and the second interface (12) is connected to the throttling hole (212). In the release position, the first interface (11) and the second interface (12) are connected through the moving channel (14). An elastic element (3) is located within the moving channel (14) for driving the valve core (2) to move from the release position to the throttling position; the control interface (13) is adapted to allow the intake of a control medium to drive the valve core (2) to move to the throttling position.

2. The controllable throttle valve according to claim 1, characterized in that, The valve body (1) is provided with a first chamber (15) and a second chamber (16). The first chamber (15) is connected to the first interface (11), and the second chamber (16) is connected to the second interface (12). The first chamber (15) and the moving channel (14) extend along a first direction and are connected in sequence. The throttling blind hole (211) extends along the first direction, and the second chamber (16) extends along a second direction and is connected to the moving channel (14). The second direction forms an angle with the first direction, and the throttling hole (212) extends along the second direction.

3. The controllable throttle valve according to claim 1, characterized in that, The outer wall of the valve core (2) is provided with a first sealing surface (23) arranged around the center line of the valve core (2), and the valve body (1) is provided with a second sealing surface arranged around the center line of the moving channel (14). The second sealing surface is located between the connection between the first interface (11) and the moving channel (14) and the connection between the second interface (12) and the moving channel (14). In the throttling position, the first sealing surface (23) abuts against the second sealing surface.

4. The controllable throttle valve according to claim 1, characterized in that, It also includes a sealing ring (4), which is connected between the outer wall of the valve core (2) and the inner wall of the moving channel (14). The sealing ring (4) is located between the connection between the control interface (13) and the moving channel (14), the connection between the first interface (11) and the moving channel (14), and the connection between the second interface (12) and the moving channel (14).

5. The controllable throttle valve according to claim 4, characterized in that, The valve core (2) has a limiting blind hole (22) on the end face of the other end. A portion of the elastic element (3) is located in the limiting blind hole (22). The cross-sectional area of ​​the limiting blind hole (22) is greater than the cross-sectional area of ​​the throttling blind hole (211).

6. The controllable throttle valve according to any one of claims 1-5, characterized in that, It also includes a screw plug (5), which includes a connecting seat (52) and a limiting member (51). The connecting seat (52) is detachably connected to the valve body (1), and the limiting member (51) is located in the moving channel (14). In the released position, the valve core (2) abuts against the limiting member (51), and the valve core (2) is located on the side facing the first interface (11) and the second interface (12) at the connection between the control interface (13) and the moving channel (14). The elastic member (3) is sleeved on the limiting member (51) and abuts against the connecting seat (52). The outer circumferential dimension of the elastic member (3) is adapted to the circumferential dimension of the limiting blind hole (22).

7. A speed regulating system for a push-type hydraulic cylinder, characterized in that, include: A push cylinder (200) is provided with a rod chamber (201) and a rodless chamber (202). A controllable throttle valve, wherein the controllable throttle valve is the controllable throttle valve (100) according to any one of claims 1-6, wherein one of the first interface (11) and the second interface (12) is connected to the rodless chamber (202); The liquid storage container (300) is connected to another of the first interface (11) and the second interface (12) through a first reversing valve (400), the liquid storage container (300) is connected to the control interface (13) through a second reversing valve (500), and the liquid storage container (300) is connected to the rod chamber (201) through a third reversing valve (600).

8. The speed regulating system for the pushing cylinder according to claim 7, characterized in that, Each of the first reversing valve (400), the second reversing valve (500), and the third reversing valve (600) is provided with a first valve port, a second valve port, and a third valve port. The first valve ports of the first reversing valve (400), the second reversing valve (500), and the third reversing valve (600) are respectively connected to the liquid storage container (300) through the corresponding booster pump (700). The third valve ports of the first reversing valve (400), the second reversing valve (500), and the third reversing valve (600) are respectively connected to the liquid storage container (300). The second valve port of the first reversing valve (400) is connected to the other of the first interface (11) and the second interface (12). The second valve port of the second reversing valve (500) is connected to the control interface (13). The second valve port of the third reversing valve (600) is connected to the rod chamber (201).

9. A speed regulation method based on the push-type hydraulic cylinder speed regulation system according to claim 7 or 8, characterized in that, This includes a speed control method for the push cylinder (200) during its extension action and a speed control method for the push cylinder (200) during its retraction action; The speed adjustment method during the extension action includes: The second reversing valve (500) is opened to allow the medium in the liquid storage container (300) to enter the control interface (13) as the control medium, and the valve core (2) is placed in the throttling position; Open the first reversing valve (400) so that the medium in the liquid storage container (300) can flow through the second port (12), the throttling channel (21) and the first port (11) into the rodless chamber (202). The flow direction of the second reversing valve (500) is reversed so that the control medium flows back from the control interface (13) to the liquid storage container (300), and the valve core (2) is moved from the throttling position to the release position; The speed adjustment method during the contraction action includes: When the second reversing valve (500) is in the open state and the valve core (2) is in the throttling position, the third reversing valve (600) is opened to allow the medium in the liquid storage container (300) to enter the rod chamber (201). The flow direction of the second reversing valve (500) is reversed so that the medium flows back from the control interface (13) to the liquid storage container (300), and the valve core (2) is moved from the throttling position to the release position.

Images