Self-locking hydraulic power system

Abstract

The invention discloses a self-locking type hydraulic power system which comprises a hydraulic pump and a hydraulic power system, the reversing valve comprises a valve body, a hydraulic lock and a reversing valve rod mechanism, the hydraulic lock and the reversing valve rod mechanism are arranged in the valve body, a first oil outlet, a second oil outlet and a circulation flow channel are formed in the valve body, the circulation flow channel is provided with a first end and a second end which are opposite, and the hydraulic lock is used for achieving connection and disconnection between the first end and the first oil outlet. The reversing valve rod mechanism is used for applying driving force to the hydraulic lock; the hydraulic rod comprises a cylinder body and a piston rod, and an inner cavity of the cylinder body is divided into a first sub-cavity and a second sub-cavity; when the first driving motor rotates in the first direction, the hydraulic lock can be pushed away by oil; when the first driving motor rotates in the second direction, the reversing valve rod mechanism can open the hydraulic lock; when the first driving motor stops rotating, the oil liquid and the piston rod are in a static state. According to the self-locking type hydraulic power system, the piston rod can be stopped in any state, and energy consumption is reduced.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic technology, specifically relating to a self-locking hydraulic power system. Background Technology

[0002] An electro-hydraulic actuator is a device that drives the movement of an external structure by moving a piston rod. It typically includes a hydraulic pump and a hydraulic rod. The operation of the hydraulic pump drives the flow of hydraulic fluid, which in turn drives the extension and retraction of the piston rod within the hydraulic rod, thus moving the external structure. However, in existing technologies, when the piston rod needs to keep the external structure stationary, it can only be in its longest extended position or fully retracted position. Furthermore, the hydraulic pump must continue to operate to maintain the piston rod's stillness, resulting in energy waste. Summary of the Invention

[0003] The purpose of this invention is to disclose a self-locking hydraulic power system to solve the energy consumption problem caused by the need for motor drive when the piston rod in the electro-hydraulic actuator is in a stationary state.

[0004] To achieve the above objectives, the present invention discloses a self-locking hydraulic power system, comprising: A hydraulic pump includes an oil tank, a gear set, and a first drive motor. The gear set is located inside the oil tank, and the first drive motor is connected to the gear set. A directional control valve includes a valve body, a hydraulic lock disposed within the valve body, and a directional control valve stem mechanism. The valve body has a first oil outlet, a second oil outlet, and a flow channel. The first oil outlet and the second oil outlet are respectively connected to a first end and a second end of the flow channel. The hydraulic lock is disposed at the first end and is used to realize the conduction and blocking between the first end and the first oil outlet. The directional control valve stem mechanism is slidably disposed at the second end and is used to realize the disconnection between the first end and the second end and to apply driving force to the hydraulic lock. A hydraulic rod includes a cylinder body and a piston rod movably disposed within the cylinder body. The piston rod divides the inner cavity of the cylinder body into a first sub-cavity and a second sub-cavity. The first sub-cavity is connected to the first end, and the second sub-cavity is connected to the second end. Specifically, when the first drive motor rotates in the first direction, the hydraulic lock can be pushed open by the oil, thereby realizing the connection between the first end and the first sub-cavity; when the first drive motor rotates in the second direction, the reversing valve stem mechanism can move in the direction of the hydraulic lock under the drive of the oil to open the hydraulic lock, wherein the second direction is opposite to the first direction; when the first drive motor stops rotating, the hydraulic lock and the reversing valve stem mechanism can be reset, so that the oil is in a static state, thereby realizing that the piston rod is in a static state.

[0005] As an optional implementation, the flow channel has a first section and a second section with different inner diameters at the second end, wherein the inner diameter of the second section is larger than the inner diameter of the first section. The reversing valve stem mechanism includes a valve stem and a first sealing ring sleeved on the valve stem. The valve stem includes at least a first part and a second part with different outer diameters. The outer diameter of the second part is larger than that of the first part. The first sealing ring is sleeved on the second part. The first part is slidably disposed on the first segment, and the second part is slidably disposed on the second segment. The first sealing ring and the inner wall of the second segment abut against each other.

[0006] As an optional implementation, the valve stem further includes a third part, which is connected sequentially with the first part and the second part. The outer diameter of the third part is smaller than that of the first part, and it is used to apply a pushing force to the hydraulic lock.

[0007] As an optional implementation, the outer wall of the valve stem is provided with a groove, and the first sealing ring is disposed in the groove.

[0008] As an optional implementation, the directional valve stem mechanism further includes a first elastic element, which abuts against one end of the valve stem and is used to apply an elastic force to the valve stem in a direction away from the hydraulic lock.

[0009] As an optional implementation, the flow channel further includes a third section at the second end, the third section being connected to the end of the second section away from the first section, and the inner diameter of the third section being larger than the inner diameter of the second section; The reversing valve stem mechanism further includes a retaining plate, which is sleeved on the valve stem. The two ends of the first elastic member abut against the side wall of the third segment and the retaining plate, respectively.

[0010] As an optional implementation, the hydraulic lock includes a lock cylinder, a second elastic element, and a first mounting component and a second mounting component that are separately configured. An installation space is formed between the first mounting component and the second mounting component. The second mounting component and the first mounting component are respectively provided with a channel opening and an outlet opening that communicate with the installation space. The lock cylinder and the first mounting component are slidably disposed within the installation space to open and block the channel opening. The second elastic element is disposed within the installation space, and its two ends abut against the first mounting component and the lock cylinder, respectively, to apply an elastic force to the lock cylinder in the direction of the reversing valve stem mechanism.

[0011] As an optional implementation, the self-locking hydraulic power system further includes a first pressure regulating valve. The valve body is provided with a first pressure regulating flow channel and a first pressure regulating port that are connected. The first pressure regulating port can be connected to the first oil outlet. The first pressure regulating valve is movably disposed in the first pressure regulating flow channel and is used to adjust the size of the communication area between the first pressure regulating port and the first oil outlet. And / or, The self-locking hydraulic power system also includes a second pressure regulating valve. The valve body is provided with a second pressure regulating channel and a second pressure regulating port that are connected. The second pressure regulating port can be connected to the second oil outlet. The second pressure regulating valve is movably disposed in the second pressure regulating channel and is used to adjust the size of the connection area between the second pressure regulating port and the second oil outlet.

[0012] As an optional implementation, the self-locking hydraulic power system further includes a pressure sensor installed on the valve body for detecting the oil pressure at the first or second oil outlet.

[0013] As an optional implementation, the fuel tank is made of a metal material; The hydraulic pump also includes a telescopic diaphragm, which is located on the inner wall of the oil tank at the end away from the valve body.

[0014] Compared with the prior art, the beneficial effects of the self-locking hydraulic power system of the present invention are as follows: The self-locking hydraulic power system of this invention, driven by a first drive motor, rotates a gear set to realize the flow of oil in the suction window and the supply window, thereby realizing the inflow and outflow of oil between the first and second oil outlets. When the first drive motor rotates in the first direction, the oil flows out from the first oil outlet and flows towards the hydraulic lock. Under the pressure of the oil, the hydraulic lock is pushed open. At this time, the oil flows through the hydraulic lock and the first end of the flow channel, and flows into the first sub-cavity of the cylinder. As the volume of the first sub-cavity increases, it pushes the piston rod. The oil in the second sub-cavity flows to the second end of the flow channel and flows back to the oil tank through the second oil outlet, realizing the circulation of the oil. When the first drive motor rotates in the opposite second direction, the oil flows out from the second oil outlet and flows towards the second end of the flow channel. The pressure of the oil pushes the reversing valve rod mechanism towards the hydraulic lock. The mechanism pushes open the hydraulic lock, allowing oil to flow into the second sub-chamber to drive the piston rod. The piston rod compresses the first sub-chamber, and the oil in the first sub-chamber flows back to the first outlet through the first end and then back to the oil tank, thus achieving oil circulation. When the first drive motor stops rotating, no oil flows out of either the first or second outlet. At this time, no oil applies pressure to the hydraulic lock or the directional valve mechanism, causing the hydraulic lock or directional valve mechanism to reset. The oil remains stationary, and the piston rod is also stationary. Because the piston rod is stationary, the driven external structure remains in one position. Simultaneously, the first drive motor is de-energized, requiring no energy consumption, thus achieving energy savings. Furthermore, the piston rod can stop at any position within the cylinder, enhancing the practicality of the entire self-locking hydraulic power system. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional schematic diagram of the self-locking hydraulic power system according to an embodiment of the present invention. Figure 2 yes Figure 1 A structural schematic diagram of the self-locking hydraulic power system from another perspective; Figure 3 yes Figure 1 Side view of the self-locking hydraulic power system in the image; Figure 4 yes Figure 3 A cross-sectional view along the AA direction; Figure 5 yes Figure 4 A schematic diagram of the valve body in the diagram; Figure 6 yes Figure 3 A cross-sectional view along the BB direction; Figure 7 yes Figure 1 A bottom view of the self-locking hydraulic power system in the image; Figure 8 yes Figure 7 A cross-sectional view along the CC direction; Figure 9 yes Figure 4 A schematic diagram of the hydraulic lock and directional valve stem mechanism in the diagram; Figure 10 yes Figure 9 A schematic diagram of the reversing valve stem mechanism in the diagram; Figure 11 yes Figure 9 A cross-sectional schematic diagram of the hydraulic lock and directional valve stem mechanism in the figure; Figure 12 yes Figure 9 An exploded view of the hydraulic lock in the diagram; Figure 13 yes Figure 9 An exploded view of the hydraulic lock from another perspective; Figure 14 This is a schematic diagram of a usage state of the self-locking hydraulic power system according to an embodiment of the present invention; Figure 15 This is a schematic diagram of another usage state of the self-locking hydraulic power system according to an embodiment of the present invention.

[0017] Explanation of key figure labels: 100-Self-locking hydraulic power system, 10-Hydraulic pump, 11-Oil tank, 12-Gear set, 121-Driving gear, 122-Driven gear, 13-First drive motor, 14-Oil suction window, 15-Oil pressure window, 16-Telescopic diaphragm, 20-Directional control valve, 21-Valve body, 211-First oil outlet, 212-Second oil outlet, 213-Flow channel, 2131-First end, 2132-Second end Two ends, 2133-first section, 2134-second section, 2135-third section, 214-first pressure regulating channel, 215-first pressure regulating port, 216-second pressure regulating channel, 217-second pressure regulating port, 218-first intermediate channel, 219-second intermediate channel, 22-hydraulic lock, 221-lock cylinder, 222-second elastic element, 223-first mounting component, 2231-outlet, 224-second Mounting component, 2241-channel opening, 225-installation space, 226-second sealing ring, 23-reversing valve stem mechanism, 231-valve stem, 2311-first part, 2312-second part, 2313-third part, 2314-slot, 232-first sealing ring, 233-first elastic element, 234-support piece, 27-first sealing plug, 28-second sealing plug, 29-first docking flow channel, 30-hydraulic rod, 31-cylinder body, 32-piston rod, 33-first sub-cavity, 34-second sub-cavity, 36-second docking flow channel, 37-return oil pipe, 40-first pressure regulating valve, 41-first moving part, 42-third elastic element, 43-first ball, 44-second drive motor, 50-second pressure regulating valve, 51-second moving part, 52-fourth elastic element, 53-second ball, 60-pressure sensor. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0020] Furthermore, some of the aforementioned terms, besides indicating direction or positional relationships, may also have other meanings. For example, the term "above" may, in certain circumstances, indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0021] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0022] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0023] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0024] Please see Figures 1 to 15 This application provides a self-locking hydraulic power system 100, including a hydraulic pump 10, a reversing valve 20, and a hydraulic rod 30.

[0025] Please refer to Figures 1 to 4The hydraulic pump 10 includes an oil tank 11, a gear set 12, and a first drive motor 13. The gear set 12 is located inside the oil tank 11, and the first drive motor 13 is connected to the gear set 12. An oil suction window 14 and an oil supply window 15 are formed between the gear sets 12. The reversing valve 20 includes a valve body 21, a hydraulic lock 22 located inside the valve body 21, and a reversing valve stem mechanism 23. The valve body 21 has a first oil outlet 211, a second oil outlet 212, and a flow channel 213. Oil port 211 and second oil outlet 212 are respectively connected to the first end 2131 and the second end 2132 of the flow channel 213. A hydraulic lock 22 is located at the first end 2131 to enable and disable communication between the first end 2131 and the first oil outlet 211. A directional valve stem mechanism 23 is slidably located at the second end 2132 to enable disconnection between the first end 2131 and the second end 2132 and to apply driving force to the hydraulic lock 22. The hydraulic rod... The cylinder 30 includes a cylinder body 31 and a piston rod 32 movably disposed within the cylinder body 31. The piston rod 32 divides the inner cavity of the cylinder body 31 into a first sub-cavity 33 and a second sub-cavity 34. The first sub-cavity 33 is connected to the first end 2131, and the second sub-cavity 34 is connected to the second end 2132. When the first drive motor 13 rotates in a first direction, the hydraulic lock 22 can be pushed open by the oil in the oil tank 11, thereby realizing the connection between the first end 2131 and the first sub-cavity 33. When the first drive motor 13 rotates in a second direction, the reversing valve rod mechanism 23 can move in the direction of the hydraulic lock 22 under the drive of the oil to open the hydraulic lock 22, thereby realizing the connection between the first end 2131 and the first sub-cavity 33. The second direction is opposite to the first direction. When the first drive motor 13 stops rotating, the hydraulic lock 22 and the reversing valve rod mechanism 23 can be reset, so that the oil is in a static state, thereby realizing that the piston rod 32 is in a static state.

[0026] The aforementioned self-locking hydraulic power system 100, driven by the first drive motor 13, rotates the gear set 12, enabling the flow of oil in the oil suction window 14 and the oil supply window 15, thereby realizing the inflow and outflow of oil between the first oil outlet 211 and the second oil outlet 212. When the first drive motor 13 rotates in the first direction, the oil flows out from the first oil outlet 211 and flows towards the hydraulic lock 22. Under the pressure of the oil, the hydraulic lock 22 is pushed open. At this time, the oil flows through the hydraulic lock 22 and the flow channel 213. One end 2131 flows into the first sub-cavity 33 of the cylinder 31. As the volume of the first sub-cavity 33 increases, it pushes the piston rod 32. The oil in the second sub-cavity 34 flows to the second end 2132 of the flow channel 213 and flows back to the oil tank 11 through the second oil outlet 212, thus realizing the circulation of the oil. When the first drive motor 13 rotates in the second direction, the oil flows out from the second oil outlet 212 and flows to the second end 2132 of the flow channel 213. The pressure of the oil pushes the reversing valve rod mechanism 23 towards the hydraulic lock 22. When the hydraulic fluid flows to the second sub-chamber 34, the reversing valve stem mechanism 23 pushes open the hydraulic lock 22, allowing the oil to flow into the second sub-chamber 34 and drive the piston rod 32. The piston rod 32 compresses the first sub-chamber 33, and the oil in the first sub-chamber 33 flows back to the first oil outlet 211 through the first end 2131 and then back to the oil tank 11, thus achieving oil circulation. When the first drive motor 13 stops rotating, no oil flows out of either the first oil outlet 211 or the second oil outlet 212, and at this time, no oil applies pressure to the hydraulic lock 22 or the reversing valve stem mechanism 23. When the hydraulic lock 22 or the directional valve rod mechanism 23 is reset, the oil cannot flow and is in a static state, so the piston rod 32 is also in a static state. Since the piston rod 32 can be in a static state, the driven external structure can always be in one position. At the same time, the first drive motor 13 is de-energized and does not need to consume energy, thus achieving the effect of saving energy. Furthermore, the piston rod 32 can stop at any position in the cylinder 31, thereby improving the practicality of the entire self-locking hydraulic power system 100.

[0027] Please refer to Figures 1 to 3 In this embodiment, when the hydraulic pump 10 is installed with the directional valve 20, the oil tank 11 and the hydraulic rod 30 are located on the same side of the directional valve 20, and the cylinder body 31 is installed on the valve body 21 of the directional valve 20. The first drive motor 13 and the oil tank 11 are respectively located on opposite sides of the valve body 21, thus achieving reasonable space utilization. It should be noted that since the directional valve rod mechanism 23 and the hydraulic lock 22 are respectively installed at opposite ends of the flow channel 213, the flow channel 213 needs to be in a sealed state. Therefore, the directional valve 20 in this embodiment also includes a first sealing plug 27 and a second sealing plug 28. The first sealing plug 27 blocks the first end 2131 of the flow channel 213, and the second sealing plug 28 blocks the second end 2132 of the flow channel 213.

[0028] This is understandable; please refer to [link / reference]. Figure 4 and Figure 5 The valve body 21 is also provided with a first intermediate channel 218 and a second intermediate channel 219. The first intermediate channel 218 is connected between the first oil outlet 211 and the first end 2131 of the flow channel, and the second intermediate channel 219 is connected between the second oil outlet and the second end 2132.

[0029] Furthermore, when the oil flows to the first end 2131, it needs to flow through the first end 2131 to the first sub-cavity 33. The valve body 31 is also provided with a first docking channel 29, and the cylinder body 31 is provided with a second docking channel 36 corresponding to the first docking channel 29. The second docking channel 36 connects the first docking channel 29 and the first sub-cavity 33. Among them, the hydraulic rod 30 includes a return oil pipe 37, which connects the second sub-cavity 34 and the second end 2132.

[0030] Please see Figure 7 This is a bottom view of the self-locking hydraulic power system 100 according to an embodiment of the present invention. Figure 8 for Figure 7 A cross-sectional view along the CC direction shows that the inner cavity of the cylinder 31 is divided into an independent first sub-cavity 33 and a second sub-cavity 34 by the piston rod 32.

[0031] Please see Figure 5 , Figures 9 to 11 This is a schematic diagram of the reversing valve stem mechanism 23 according to an embodiment of the present invention. The reversing valve stem mechanism 23 includes a valve stem 231 and a first sealing ring 232 sleeved on the valve stem 231. The flow channel 213 has a first section 2133 and a second section 2134 with different inner diameters at the second end 2132. The inner diameter of the second section 2134 is larger than the inner diameter of the first section 2133. The valve stem 231 includes at least a first part 2311 and a second part 2312 with different outer diameters. The outer diameter of the second part 2312 is larger than the outer diameter of the first part 2311. The first sealing ring 232 is sleeved on the second part 2312. The first part 2311 is slidably disposed on the first part 2311. A first section 2133 and a second section 2312 slide on a second section 2134. The first sealing ring 232 abuts against the inner wall of the second section 2134. Thus, the first section 2133 and the second section 2134 are set with different inner diameters. Since the inner diameter of the second section 2134 is larger than the inner diameter of the first section 2133, the first sealing ring 232 is fitted onto the second section 2312 and can abut against the inner wall of the second section 2134, thereby achieving the separation between the flow channels 23 and the segmentation between the first end 2131 and the second end 2132, avoiding the oil flow caused by the conduction between the first end 2131 and the second end 2132.

[0032] Furthermore, to prevent the oil flowing from the first oil outlet 211 from being obstructed by the valve stem 231 when flowing towards the hydraulic lock 22, the valve stem 231 in this embodiment also includes a third part 2313. The third part 2313, the first part 2311, and the second part 2312 are connected in sequence. The outer diameter of the third part 2313 is smaller than the outer diameter of the first part 2311, and it is used to apply a pushing force to the hydraulic lock 22. In this way, by setting the third part 2313 with a smaller outer diameter, when the valve stem 231 pushes open the hydraulic lock 22, the oil flowing from the first oil outlet 211 can have more flow space and flow into the channel of the hydraulic lock 22, thereby achieving smooth oil flow and avoiding obstruction by the valve stem 231.

[0033] Please refer to Figure 11 In order to achieve stable installation of the first sealing ring 232, the outer wall of the valve stem 231 in this embodiment is provided with a groove 2314, and the first sealing ring 232 is disposed in the groove 2314. In this way, after the first sealing ring 232 is disposed in the groove 2314, it is blocked by the groove wall of the groove 2314, which prevents the first sealing ring 232 from shifting along the axial direction of the valve stem 231 during the movement of the valve stem 231.

[0034] Specifically, a groove 2314 is provided on the outer wall of the second part 2312. Since the second part 2312 has a larger outer diameter, it can drive the first sealing ring 232 to abut against the inner wall of the second section 2134, and at the same time, it can drive the first sealing ring 232 to slide in the second part 2312 under the movement of the valve stem 231.

[0035] Please see Figures 9 to 11 In one embodiment of the present invention, in order to enable the reversing valve stem mechanism 23 to quickly reset in the power-off state, the reversing valve stem mechanism 23 further includes a first elastic element 233. The first elastic element 233 abuts against one end of the valve stem 231 and is used to apply an elastic force to the valve stem 231 in a direction away from the hydraulic lock 22. Thus, through the setting of the first elastic element 233, when oil flows out of the second oil outlet 212, the oil applies a pushing force to the valve stem 231, and the valve stem 231 moves towards the hydraulic lock 22, applying a pushing force to the hydraulic lock 22 to open the hydraulic lock 22. At the same time, the first elastic element 233 is compressed. When the first drive motor 13 is de-energized, the oil in the second oil outlet 212 does not flow out. The elastic force generated by the compression of the first elastic element 233 is greater than the pushing force of the oil. The first elastic element 233 drives the valve stem 231 to quickly reset, and the hydraulic lock 22 also resets. At this time, the oil does not flow in the entire circulation loop, and the piston rod 32 is in a stationary state.

[0036] Specifically, please refer to Figure 5 as well as Figures 9 to 11When the first elastic element 233 applies an elastic force to one end of the valve stem 231, the flow channel 213 further includes a third section 2135 at the second end 2132. The third section 2135 is connected to the end of the second section 2134 away from the first section 2133, and the inner diameter of the third section 2135 is larger than the inner diameter of the second section 2134. The reversing valve stem mechanism 23 also includes a retaining plate 234, which is sleeved on the valve stem 231. The two ends of the first elastic element 233 are... The first elastic member 233 abuts against the side wall of the third section 2135 and the abutment piece 234, respectively. By providing the abutment piece 234 at the end of the valve stem 231 and cooperating with the third section 2135 with a larger inner diameter, the two ends of the first elastic member 233 can abut against the side wall of the third section 2135 and the abutment piece 234 respectively. When the valve stem 231 moves in the flow channel 213, it can compress the first elastic member 233 so that the first elastic member 233 generates elastic potential energy.

[0037] Specifically, in this embodiment, the first elastic element 233 is a spring, which is wound around the valve stem 231. In other embodiments, the first elastic element 233 can also be configured as a spring structure with multiple stacked plates.

[0038] Please see Figures 11 to 13This is a schematic diagram of the structure of a hydraulic lock 22 according to an embodiment of the present invention. The hydraulic lock 22 includes a lock cylinder 221, a second elastic element 222, and a first mounting member 223 and a second mounting member 224 that are separately arranged. An installation space 225 is formed between the first mounting member 223 and the second mounting member 224. The second mounting member 224 and the first mounting member 223 are respectively provided with a channel opening 2241 and an outlet opening 2231 that communicate with the installation space 225. The lock cylinder 221 and the first mounting member 223 are slidably arranged and slidably disposed in the installation space. Within the mounting space 225, a second elastic element 222 is used to open and close the passage opening 2241. This second elastic element 222 is located within the mounting space 225, with its two ends respectively abutting against the first mounting member 223 and the lock cylinder 221. It applies a restoring elastic force to the lock cylinder 221, thereby applying a pushing force to the lock cylinder 221 when the pressure of the oil flowing from the first oil outlet 211 gradually increases. This pushes the lock cylinder 221 to slide relative to the first mounting member 223. At this time, the lock cylinder 221 moves away from the passage opening 2241 of the second mounting member 224, and the passage opening 2241 is opened, allowing passage... The inlet 2241 is connected to the first oil outlet 211. Oil flows sequentially through the first oil outlet 211, the flow channel 213, the channel opening 2241, and the outlet 2231, and then flows into the first sub-cavity 33 of the cylinder body 31. When the first oil outlet 211 stops discharging oil, the driving force of the oil disappears. Under the elastic driving force of the second elastic element 222, the lock cylinder 221 moves towards the channel opening 2241 and blocks the channel opening 2241. Or, when the oil needs to flow in the opposite direction (i.e., from the first sub-cavity 33 to the first...), Oil flows out from the first outlet 211 and the second outlet 212. The oil exerts a pushing force on the valve stem 231, which pushes the valve stem 231 to move in the direction of the hydraulic lock 22. The valve stem 231 exerts a pushing force on the lock core 221. At this time, the core 221 opens the channel port 2241. Thus, the oil flowing from the first sub-cavity 33 can flow to the outlet 2231 and flow back to the first outlet 211 through the channel port 2241. At this time, the reversing valve stem mechanism 23 realizes the effect of reversing the flow direction of the oil.

[0039] In this embodiment, the second mounting component 224 and the first mounting component 223 are sleeved together, and the first mounting component 223 is threadedly connected to the first end 2131 to realize the installation of the entire hydraulic lock 22 at the first end 2131.

[0040] In order to achieve sealing of the first end 2131, the hydraulic lock 22 in this embodiment also includes a second sealing ring 226, which is sleeved on the end of the second mounting member 224 away from the first mounting member 223.

[0041] Please see Figure 4 , Figure 5 , Figure 14 as well as Figure 15In one embodiment of the present invention, in order to adjust the oil pressure of the first oil outlet 211 and / or the second oil outlet 212, the self-locking hydraulic power system 100 further includes a first pressure regulating valve 40. The valve body 21 is provided with a first pressure regulating channel 214 and a first pressure regulating port 215 that are connected. The first pressure regulating port 215 can be connected to the first oil outlet 211. The first pressure regulating valve 40 is movably disposed in the channel of the first pressure regulating channel 214 and is used to adjust the size of the communication area between the first pressure regulating port 215 and the first oil outlet 211; and / or, the self-locking hydraulic power system 100 further includes a second pressure regulating valve 50, the valve body 21 being provided with a second pressure regulating channel 214 that is connected. 6. The second pressure regulating port 217 is connected to the second oil outlet 212. The second pressure regulating valve 50 is movably disposed in the flow channel 216 of the second pressure regulating channel and is used to adjust the size of the connection area between the second pressure regulating port 217 and the second oil outlet 212. Thus, by setting the first pressure regulating valve 40 and / or the second pressure regulating valve 50, the oil output of the first oil outlet 211 and / or the second oil outlet 212 can be adjusted, that is, the oil pressure of the first oil outlet 211 and / or the second oil outlet 212 can be adjusted, thereby adjusting the oil pressure of the first oil outlet 211 and / or the second oil outlet 212, which in turn adjusts the extension and retraction speed of the piston rod 32.

[0042] Specifically, in order to facilitate pressure adjustment of the first oil outlet 211 and the second oil outlet 212, this embodiment provides a first pressure regulating valve 40 and a second pressure regulating valve 50 for each of the first oil outlet 211 and the second oil outlet 212.

[0043] Please refer to Figure 4 The first pressure regulating valve 40 includes a first movable member 41, a third elastic member 42, and a first ball 43. The two ends of the third elastic member 42 abut against the first movable member 41 and the first ball 43, respectively. By adjusting the position of the first movable member 41 in the first pressure regulating channel 214, the third elastic member 42 can have different compression amounts, thereby adjusting the sealing area of ​​the first ball 43 on the first pressure regulating port 215. Correspondingly, the second pressure regulating valve 50 includes a second movable member 51, a fourth elastic member 52, and a second ball 53. The two ends of the fourth elastic member 52 abut against the second movable member 51 and the second ball 53, respectively. By adjusting the position of the second movable member 51 in the second pressure regulating channel 216, the fourth elastic member 52 can have different compression amounts, thereby adjusting the sealing area of ​​the second ball 53 on the second pressure regulating port 217.

[0044] In one embodiment, the first movable member 41 and the second movable member 51 can be threadedly connected to the sidewall of the first pressure regulating channel 214 and the sidewall of the second pressure regulating channel 216, respectively. In this way, by rotating the first movable member 41 and the second movable member 51, the compression amount of the third elastic member 42 and the fourth elastic member 52 can be adjusted.

[0045] Specifically, in order to precisely adjust the pressure at the oil outlet, the first pressure regulating valve 40 in this embodiment also includes a second drive motor 44. The second drive motor 44 is connected to the first movable part 41, and the second drive motor 44 is set as a stepper motor. When the second drive motor 44 receives a pulse signal, the stepper motor (second drive motor 44) can rotate at a fixed step angle, driving the third elastic part 42 to achieve a slight movement, thereby achieving fine and stable adjustment of the oil system pressure.

[0046] Meanwhile, in order to reduce the cost of the entire self-locking hydraulic power system 100, the second movable member 51 and the second pressure regulating channel 216 are connected by a threaded connection on the side wall in this embodiment. The compression amount of the fourth elastic member 52 is adjusted manually, thereby reducing the overall system setup cost by only setting up one stepper motor.

[0047] Specifically, the first drive motor 13 is a variable frequency motor, which can adjust the motor speed through the frequency converter, and can precisely control the oil flow of the hydraulic pump 10, thereby controlling the extension and retraction speed of the hydraulic rod 30 to achieve smooth adjustment.

[0048] Please see Figure 1 , Figure 3 and Figure 4 In one embodiment of the present invention, in order to detect the oil pressure in the entire reversing valve 20 in real time, the self-locking hydraulic power system 100 further includes a pressure sensor 60. The pressure sensor 60 is installed on the valve body 21 and is used to detect the oil pressure at the first oil outlet 211 or the second oil outlet 212, that is, to detect the output pressure of the hydraulic pump 10. Thus, by setting the pressure sensor 60, the pressure data of the first oil outlet 211 or the second oil outlet 212 is collected in real time, and the pressure signal is converted into an electrical signal and fed back to the control system. This allows the control system to keep track of the current pressure status and adjust the oil flow rate, thereby achieving the effect of controlling the extension and retraction speed of the piston rod 32. For example, when the control system receives the pressure signal, it controls the second drive motor 44 to rotate, adjusting the first pressure regulating valve 40, thereby adjusting the oil pressure. Specifically, in this embodiment, the pressure sensor 60 is located at the first oil outlet 211.

[0049] Please see Figure 6 Here is a schematic diagram of the hydraulic pump 10 in this embodiment: The gear set 12 includes a driving gear 121 and a driven gear 122. The driving gear 121 is connected to the output shaft of the first drive motor 13. When the driving gear 121 receives the torque of the first drive motor 13, it drives the driven gear 122 to rotate. An oil suction window 14 and an oil pressure window 15 are formed between the driving gear 121 and the driven gear 122. The switching between the oil suction window 14 and the oil outlet window is realized by the forward and reverse rotation of the first drive motor 13, thereby realizing the switching of oil inlet and outlet of the first oil outlet 211 and the second oil outlet 212.

[0050] Please see Figure 8 In one embodiment of the present invention, in order to achieve miniaturization of the entire system, the oil tank 11 of this embodiment is made of metal, such as carbon steel plate, stainless steel or aluminum alloy.

[0051] To ensure pressure balance within the oil tank 11, the hydraulic pump 10 in this embodiment further includes a telescopic diaphragm 16. The telescopic diaphragm 16 is located on the inner wall of the end of the oil tank 11 furthest from the valve body 21. Thus, when oil flows back into the oil tank 11, the increasing oil volume compresses the telescopic diaphragm 16, providing space for the oil and preventing excessive pressure within the oil tank 11. When oil is pumped from the oil tank 11 to the hydraulic rod 30, the oil volume in the oil tank 11 decreases, and the telescopic diaphragm 16 contracts downwards to fill the space left by the outflowing oil, preventing negative pressure from forming within the oil tank 11. Compared to the prior art where the oil tank 11 uses an internal bladder and an additional metal layer outside the bladder, this embodiment not only reduces the overall production cost of the oil tank 11 but also reduces its overall volume due to the single metal shell, achieving miniaturization of the entire hydraulic system.

[0052] Please see Figure 14 and Figure 15 The diagram illustrates two types of oil flow in the self-locking hydraulic power system 100 according to an embodiment of the present invention. The usage process of the self-locking hydraulic power system 100 is as follows: (1) Please refer to Figure 14 When the first drive motor 13 rotates in the first direction, for example, assuming the first direction is clockwise, oil flows out of the first oil outlet 211. The oil gradually flows into the first intermediate channel 218 and reaches the first end 2131. The pressure of the oil in the flow channel 213 gradually increases, pushing the hydraulic lock 22 and the reversing valve stem mechanism 23 to move (i.e., Figure 14When the valve core 221 of the hydraulic lock 22 moves to the left and the valve rod 231 in the reversing valve rod mechanism 23 moves to the right, the hydraulic lock 22 is opened. At this time, the oil flows through the hydraulic lock 22 into the first sub-cavity 33 of the cylinder 31, and the volume in the first sub-cavity 33 gradually increases, compressing the second sub-cavity 34. The oil in the second sub-cavity 34 flows to the second end 2132 and flows back to the oil tank 11 through the second intermediate channel 219 and the second oil outlet 212. (2) When the first drive motor 13 rotates in the second direction, for example, assuming the second direction is counterclockwise, the oil is gradually discharged from the second oil outlet 212 and flows to the second end 2132 through the second intermediate channel 219. The pressure in the second end 2132 gradually increases, generating a pushing force on the valve stem 231 in the direction of the hydraulic lock 22 until the valve stem 231 pushes open the hydraulic lock 22. At this time, the oil flows into the second sub-cavity 34 and compresses the first sub-cavity 33. The oil in the first sub-cavity 33 flows back to the oil tank 11 through the first end 2131, the hydraulic lock 22, the first intermediate channel 218 and the first oil outlet 211. (3) When the motor stops running, the oil pressure at the first end 2131 or the second end 2132 disappears. At this time, the second elastic element 222 in the hydraulic lock 22 and the first elastic element 233 in the reversing valve rod mechanism 23 apply a driving force to restore the original state to the lock core 221 and the valve rod 231 respectively. At this time, the entire oil circuit is stationary and the piston rod 32 remains stationary, thereby achieving the effect of saving energy.

[0053] Therefore, in this application, a hydraulic lock 22 and a reversing valve stem mechanism 23 are provided in the valve body 21, the piston rod 32 can be stopped at any position, and the hydraulic pump can also be in a stopped state, thus avoiding energy consumption.

[0054] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. A self-locking hydraulic power system (100), characterized in that, include: The hydraulic pump (10) includes an oil tank (11), a gear set (12) and a first drive motor (13). The gear set (12) is located in the oil tank (11), and the first drive motor (13) is connected to the gear set (12). A reversing valve (20) includes a valve body (21), a hydraulic lock (22) disposed within the valve body (21), and a reversing valve stem mechanism (23). The valve body (21) is provided with a first oil outlet (211), a second oil outlet (212), and a flow channel (213). The first oil outlet (211) and the second oil outlet (212) are respectively connected to the first end (2131) and the second end (2132) of the flow channel (213). The hydraulic lock (22) is disposed at the first end (2131) and is used to realize the conduction and blocking between the first end (2131) and the first oil outlet (211). The reversing valve stem mechanism (23) is slidably disposed at the second end (2132) and is used to realize the disconnection between the first end (2131) and the second end (2132) and to apply driving force to the hydraulic lock (22). The hydraulic rod (30) includes a cylinder (31) and a piston rod (32) movably disposed within the cylinder (31). The piston rod (32) divides the inner cavity of the cylinder (31) into a first sub-cavity (33) and a second sub-cavity (34). The first sub-cavity (33) is connected to the first end (2131), and the second sub-cavity (34) is connected to the second end (2132). When the first drive motor (13) rotates in the first direction, the hydraulic lock (22) can be pushed open by the oil, thereby realizing the connection between the first end (2131) and the first sub-cavity (33); when the first drive motor (13) rotates in the second direction, the reversing valve stem mechanism (23) can move in the direction of the hydraulic lock (22) under the drive of the oil, so as to open the hydraulic lock (22), wherein the second direction is opposite to the first direction; when the first drive motor (13) stops rotating, the hydraulic lock (22) and the reversing valve stem mechanism (23) can be reset, so that the oil is in a static state, thereby realizing that the piston rod (32) is in a static state.

2. The self-locking hydraulic power system (100) according to claim 1, characterized in that, The flow channel (213) has a first section (2133) and a second section (2134) with different inner diameters at the second end (2132), and the inner diameter of the second section (2134) is larger than the inner diameter of the first section (2133). The reversing valve stem mechanism (23) includes a valve stem (231) and a first sealing ring (232) sleeved on the valve stem (231). The valve stem (231) includes at least a first part (2311) and a second part (2312) with different outer diameters. The outer diameter of the second part (2312) is larger than the outer diameter of the first part (2311). The first sealing ring (232) is sleeved on the second part (2312). The first part (2311) is slidably disposed on the first segment (2133). The second part (2312) is slidably disposed on the second segment (2134). The inner walls of the first sealing ring (232) and the second segment (2134) abut against each other.

3. The self-locking hydraulic power system (100) according to claim 2, characterized in that, The valve stem (231) also includes a third part (2313), which is connected in sequence with the first part (2311) and the second part (2312). The outer diameter of the third part (2313) is smaller than the outer diameter of the first part (2311) and is used to apply a pushing force to the hydraulic lock (22).

4. The self-locking hydraulic power system (100) according to claim 2 or 3, characterized in that, The valve stem (231) has a groove (2314) on its outer wall, and the first sealing ring (232) is located in the groove (2314).

5. The self-locking hydraulic power system (100) according to claim 2 or 3, characterized in that, The reversing valve stem mechanism (23) further includes a first elastic element (233), which abuts against one end of the valve stem (231) and is used to apply an elastic force to the valve stem (231) in a direction away from the hydraulic lock (22).

6. The self-locking hydraulic power system (100) according to claim 5, characterized in that, The flow channel (213) further includes a third segment (2135) at the second end (2132), the third segment (2135) being connected to the end of the second segment (2134) away from the first segment (2133), and the inner diameter of the third segment (2135) being larger than the inner diameter of the second segment (2134); The reversing valve stem mechanism (23) further includes a retaining plate (234), which is sleeved on the valve stem (231). The two ends of the first elastic member (233) abut against the side wall of the third segment (2135) and the retaining plate (234), respectively.

7. The self-locking hydraulic power system (100) according to any one of claims 1-3, characterized in that, The hydraulic lock (22) includes a lock cylinder (221), a second elastic element (222), and a first mounting element (223) and a second mounting element (224) that are separately arranged. An installation space (225) is formed between the first mounting element (223) and the second mounting element (224). The second mounting element (224) and the first mounting element (223) are respectively provided with a channel opening (2241) and an outlet opening (2231) that communicate with the installation space (225). The lock cylinder (221) and the first mounting element (223) are slidably arranged and slidably arranged in the installation space (225) for opening and blocking the channel opening (2241). The second elastic element (222) is arranged in the installation space (225) and its two ends abut against the first mounting element (223) and the lock cylinder (221) respectively, for applying an elastic force to the lock cylinder (221) in the direction of the reversing valve stem mechanism (23).

8. The self-locking hydraulic power system (100) according to any one of claims 1-3, characterized in that, The self-locking hydraulic power system (100) also includes a first pressure regulating valve (40). The valve body (21) is provided with a first pressure regulating flow channel (214) and a first pressure regulating port (215) that are connected. The first pressure regulating port (215) can be connected to the first oil outlet (211). The first pressure regulating valve (40) is movably disposed in the flow channel of the first pressure regulating flow channel (214) and is used to adjust the size of the connecting area between the first pressure regulating port (215) and the first oil outlet (211). And / or, The self-locking hydraulic power system (100) also includes a second pressure regulating valve (50). The valve body (21) is provided with a second pressure regulating flow channel (216) and a second pressure regulating port (217) that are connected. The second pressure regulating port (217) can be connected to the second oil outlet (212). The second pressure regulating valve (50) is movably disposed in the flow channel of the second pressure regulating flow channel (216) and is used to adjust the size of the connection area between the second pressure regulating port (217) and the second oil outlet (212).

9. The self-locking hydraulic power system (100) according to any one of claims 1-3, characterized in that, The self-locking hydraulic power system (100) also includes a pressure sensor (60), which is installed on the valve body (21) and is used to detect the oil pressure at the first oil outlet (211) or the second oil outlet (212).

10. The self-locking hydraulic power system (100) according to any one of claims 1-3, characterized in that, The oil tank (11) is made of metal material; The hydraulic pump (10) also includes a telescopic diaphragm (16), which is disposed on the inner wall of the oil tank (11) at the end away from the valve body (21).

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