Manual hydraulic actuator

Abstract

A manual hydraulic actuator comprises a cylinder body, and an actuating cavity, an oil storage cavity and an assembling cavity are formed in the cylinder body. A piston is assembled in the execution cavity, a hydraulic rod is assembled on the piston, and the execution cavity is divided into a rodless cavity and a rod cavity by the piston; the rodless cavity is provided with a first channel communicated to the assembly cavity, and the assembly cavity, the oil storage cavity and the rod cavity are communicated in sequence; the oil storage cavity is filled with oil and high-pressure gas, and the high-pressure gas is used for pumping the oil in the oil storage cavity; a manual switching mechanism used for opening or closing the first channel is assembled in the assembling cavity. According to the manual hydraulic actuator, the compression characteristic of high-pressure gas is used for driving oil liquid to flow, an external hydraulic pump or a power source is not needed, self-driving is achieved, and energy consumption and equipment complexity are reduced.

Description

Technical Field

[0001] The utility model belongs to the field of manual actuators, and particularly relates to a manual hydraulic actuator. Background Art

[0002] In the fields of industry, construction, and medicine, manual actuators are widely used in scenarios that require manual intervention, such as equipment lifting, valve control, or precise positioning. However, traditional manual actuators usually rely on pure mechanical transmission (such as levers, gears) or simple hydraulic systems (such as manual hydraulic pumps), and their power completely depends on the external force exerted by the operator. Under high-load or high-pressure working conditions, the operator needs to continuously apply a large force, such as repeatedly pressing the manual pump or rotating the handwheel, resulting in operation fatigue, low efficiency, and difficulty in achieving precise control.

[0003] Therefore, based on some of the above situations in the prior art, this application has been further designed and improved. Summary of the Utility Model

[0004] In order to solve the above technical problems, the utility model is solved by the following technical solutions.

[0005] A manual hydraulic actuator includes a cylinder block, in which an execution cavity, an oil storage cavity, and an assembly cavity are provided; a piston is assembled in the execution cavity, a hydraulic rod is assembled on the piston, and the piston divides the execution cavity into a rodless cavity and a rod cavity; a first channel communicating with the assembly cavity is provided on the rodless cavity, and the assembly cavity, the oil storage cavity, and the rod cavity are communicated in sequence; the oil storage cavity is filled with oil and high-pressure gas, and the high-pressure gas is used to pump the oil in the oil storage cavity; a manual switching mechanism for opening or closing the first channel is assembled in the assembly cavity.

[0006] Furthermore, the manual switching mechanism includes a movable plate, a fixed plate, and a manual switching member; the fixed plate divides the assembly cavity into a switching cavity and a flow cavity, and an oil through-hole communicating with the oil storage cavity is provided on the flow cavity; the movable plate is assembled in the switching cavity, and the manual switching member passes through the fixed plate and is fixedly assembled with the movable plate; a through oil groove and an installation groove are provided on the movable plate, and a pressure maintaining valve is assembled in the installation groove; a second channel corresponding to the first channel is provided on the fixed plate;

[0007] The actuator switches between two states of lifting and holding through the manual switching mechanism: when in the lifting state, the oil through groove communicates the first channel and the second channel, and the rodless cavity and the oil storage cavity are communicated; when in the holding state, the manual switching member is controlled to drive the movable plate to rotate, so that the pressure maintaining valve closes the first channel, and the communication between the rodless cavity and the oil storage cavity is cut off.

[0008] Furthermore, the pressure maintaining valve includes a spring, and a first steel ball corresponding to the first channel and a second steel ball corresponding to the second channel are assembled on both sides of the spring.

[0009] Further, the oil passage groove is an arc-shaped groove, which is arranged on the side of the installation groove and communicates with the installation groove.

[0010] Further, when in use, the cylinder block is in an inverted state with the hydraulic rod extending downward. A through pipe is assembled in the oil storage cavity. One end of the through pipe is fixedly assembled at the oil through hole, and the other end extends below the oil liquid level.

[0011] Further, the manual switching member includes a mounting shaft and a switching handle, and the switching handle is fixedly assembled with the mounting shaft through a fixing member.

[0012] Further, a limiting post is arranged in the switching cavity, and a switching sliding groove for cooperating with the limiting post is arranged on the movable plate; when the movable plate is rotated so that the limiting post abuts against one side of the switching sliding groove, the actuator switches to the lifting state; when the movable plate is rotated so that the limiting post abuts against the other side of the switching sliding groove, the actuator switches to the holding state.

[0013] Further, a positioning elastic member is arranged radially on the movable plate, and a clamping post is arranged in the switching cavity. The clamping post abuts against one side of the positioning elastic member; when the state of the switching actuator is switched, the positioning elastic member is blocked by the clamping post and retracts. After the state switching is completed, the clamping post is located on the other side of the positioning elastic member.

[0014] Further, the piston includes an independent buffer piston and a connecting piston. The connecting piston is fixedly connected with the hydraulic rod. A buffer space is formed between the buffer piston and the connecting piston. The buffer piston and the inner wall of the actuator cavity cooperate to form a rodless cavity, and the connecting piston and the inner wall of the actuator cavity cooperate to form a rod cavity; a buffer elastic member is arranged on the side of the buffer piston facing the buffer space, and a butting head is correspondingly arranged on the connecting piston.

[0015] Further, an actuator valve plate, an oil storage valve plate and an assembly valve plate are assembled on the cylinder block to seal the corresponding actuator cavity, oil storage cavity and assembly cavity.

[0016] The manual hydraulic actuator of the present application has the following beneficial technical effects: Utilizing the compression characteristics of high-pressure gas to drive the flow of oil liquid, without the need for an external hydraulic pump or power source, achieving self-driving, reducing energy consumption and equipment complexity. And by driving the rotation of the movable plate through the manual switching member, the communication state between the oil passage groove and the channel is controlled, realizing the switching between the "lifting" and "holding" modes. The manual operation is simple and intuitive, with high safety, and is suitable for scenarios that require manual intervention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a perspective view of the manual hydraulic actuator.

[0018] Figure 2 It is a sectional view of the manual hydraulic actuator.

[0019] Figure 3 For Figure 2Partial enlarged view at A in [the figure].

[0020] Figure 4 It is a cross-sectional view at the assembly cavity.

[0021] Figure 5 It is Figure 4 Cross-sectional view at A-A in [the figure].

[0022] Figure 6 It is Figure 4 Cross-sectional view at B-B in [the figure].

[0023] Figure 7 It is an exploded view of the manual switching mechanism.

[0024] The following is an explanation of the reference numerals:

[0025] 100, cylinder block; 110, actuator cavity; 111, rodless cavity; 112, rod cavity; 113, first channel; 120, oil storage cavity; 121, oil passage hole; 122, connecting pipe; 130, assembly cavity; 132, switching cavity; 133, flow cavity; 134, limit post; 135, clamping post; 140, actuator valve plate; 150, oil storage valve plate; 160, assembly valve plate;

[0026] 200, connecting piston; 201, abutting head; 210, buffer piston; 211, buffer elastic member; 220, hydraulic rod; 230, buffer space;

[0027] 300, manual switching mechanism; 310, movable plate; 311, oil passage groove; 312, mounting groove; 313, switching chute; 314, clamping elastic member; 320, fixed plate; 321, second channel; 330, manual switching member; 331, mounting shaft; 332, switching handle; 333, fixing member;

[0028] 400, pressure maintaining valve; 410, spring; 420, first steel ball; 430, second steel ball. Specific embodiments

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] In the following embodiments, the same or similar reference numerals represent the same or similar components or components with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0031] In the description of the present utility model, it should be understood that the terms: center, longitudinal, transverse, length, width, thickness, upper, lower, front, rear, left, right, vertical, horizontal, top, bottom, inner, outer, clockwise, counterclockwise, etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, and therefore should not be construed as a limitation to the present utility model. In addition, the terms: first, second, etc. are only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the present utility model, unless otherwise clearly specified and defined, the terms: installation, connection, connection, etc. should be understood in a broad sense, and those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific circumstances.

[0032] Referring to Figures 1 to 7 , a manual hydraulic actuator includes a cylinder block 100. An execution cavity 110, an oil storage cavity 120, and an assembly cavity 130 are provided inside the cylinder block 100. An execution valve plate 140, an oil storage valve plate 150, and an assembly valve plate 160 are assembled on the cylinder block 100 to close the corresponding execution cavity 110, oil storage cavity 120, and assembly cavity 130. The execution valve plate 140, oil storage valve plate 150, and assembly valve plate 160 on the hydraulic rod 220 respectively seal the corresponding chambers, facilitating disassembly and maintenance and reducing the maintenance cost. A piston is assembled in the execution cavity 110, and a hydraulic rod 220 is assembled on the piston. The piston divides the execution cavity 110 into a rodless cavity 111 and a rod cavity 112; a first channel 113 communicating with the assembly cavity 130 is provided on the rodless cavity 111, and the assembly cavity 130, the oil storage cavity 120, and the rod cavity 112 are communicated in sequence; the oil storage cavity 120 is filled with oil and pre-charged with high-pressure gas, and the high-pressure gas is used to pump the oil in the oil storage cavity 120; a manual switching mechanism 300 for opening or closing the first channel 113 is assembled in the assembly cavity 130.

[0033] Specifically, the manual switching mechanism 300 includes a movable plate 310, a fixed plate 320, and a manual switching member 330; the fixed plate 320 divides the assembly cavity 130 into a switching cavity 132 and a flow cavity 133, and an oil through hole 121 communicating with the oil storage cavity 120 is provided on the flow cavity 133; the movable plate 310 is assembled in the switching cavity 132, and the manual switching member 330 passes through the fixed plate 320 and is fixedly assembled with the movable plate 310; a through oil groove 311 and an installation groove 312 are provided on the movable plate 310, and a pressure maintaining valve 400 is assembled in the installation groove 312. The pressure maintaining valve 400 includes a spring 410, and a first steel ball 420 corresponding to the first channel 113 and a second steel ball 430 corresponding to a second channel 321 are assembled on both sides of the spring 410. A second channel 321 corresponding to the first channel 113 is provided on the fixed plate 320.

[0034] This application utilizes the compression characteristics of high-pressure gas to drive the flow of hydraulic oil, eliminating the need for an external hydraulic pump or power source, achieving self-driving, and reducing energy consumption and equipment complexity. Specifically, the actuator switches between the lifting and holding states through a manual switching mechanism 300:

[0035] 1. When in the lifting state, the oil passage 311 connects the first channel 113 and the second channel 321, and the rodless cavity 111 communicates with the oil storage cavity 120. It should be noted that since this application uses an internal high-pressure gas as the power source and the driving force is fixed, the retraction of the hydraulic rod 220 (i.e., the downward state) is completed by applying pressure to the piston by an external load with a pressure greater than the air pressure; while the extension of the hydraulic rod 220 (i.e., the upward state) is achieved by driving the hydraulic oil into the rodless cavity 111 by air pressure when there is no load or the pressure applied by the load to the piston is less than the air pressure.

[0036] 2. When in the holding state, control the manual switching part 330 to drive the movable plate 310 to rotate, so that the pressure-holding valve 400 closes the first channel 113, and the connection between the rodless cavity 111 and the oil storage cavity 120 is cut off. In the holding state, the pressure-holding structure of the pressure-holding valve 400 is divided into two cases: The first case is when the actuator bears a load and the hydraulic rod 220 is compressed and retracts, the oil pressure in the rodless cavity 111 increases. When the oil pressure in the rodless cavity 111 is greater than the oil pressure in the oil storage cavity 120, the high-pressure oil can forcefully push open the first steel ball 420, but cannot push open the second steel ball 430, so the oil cannot flow back to the oil storage cavity 120, making the actuator in the holding state. The second case is when the actuator does not bear a load or the load is small, and the oil pressure in the rodless cavity 111 is less than the oil pressure in the oil storage cavity 120, the oil in the oil storage cavity 120 can forcefully push open the second steel ball 430, but cannot push open the first steel ball 420, so the oil cannot flow to the rodless cavity 111, making the actuator in the holding state.

[0037] Furthermore, the oil passage 311 is an arc-shaped groove, which is arranged on the side of the installation groove 312 and communicates with the installation groove 312. This design facilitates the smooth switching of the channel connection state when the movable plate 310 rotates, ensures the smoothness of the switching action, avoids hydraulic shock caused by sudden connection or disconnection of the channel, and prolongs the service life of the movable plate 310 and the fixed plate 320. The cylinder block 100 is installed upside down, and a through pipe 122 is assembled in the oil storage cavity 120. One end of the through pipe 122 is assembled and fixed at the oil through hole 121, and the other end extends below the oil liquid level. The through pipe 122 can isolate the gas from direct contact with the channel, prevent the high-pressure gas from escaping from the oil storage cavity 120 along with the flow of the hydraulic oil, ensure the smooth flow of the hydraulic oil during the switching process, reduce the cavitation phenomenon, and improve the stability of the actuator operation.

[0038] In addition, to prevent the movable plate 310 from shifting, a limiting post 134 is further provided in the switching cavity 132, and a switching chute 313 for cooperating with the limiting post 134 is provided on the movable plate 310. When the movable plate 310 is rotated so that the limiting post 134 abuts against one side of the switching chute 313, the actuator switches to the lifting state. When the movable plate 310 is rotated so that the limiting post 134 abuts against the other side of the switching chute 313, the actuator switches to the holding state. The guiding cooperation between the limiting post 134 and the switching chute 313 ensures that it can only rotate within a preset angle range, avoiding the shift of the movable plate 310 caused by external force or assembly error, thereby ensuring the switching accuracy between the lifting state and the holding state of the actuator. A clamping elastic member 314 is radially provided on the movable plate 310, and a clamping post 135 is provided in the switching cavity 132. The clamping post 135 abuts against one side of the clamping elastic member 314, and a clamping force is generated by the restoring force of the elastic member to form mechanical self-locking. When switching the state of the actuator, the clamping elastic member 314 retracts due to the blocking of the clamping post 135. After the state switching is completed, the clamping post 135 abuts against the other side of the clamping elastic member 314. The cooperation between the clamping post 135 and the clamping elastic member 314 can ensure the long-term stability of the actuator in the lifting or holding state, avoid the free rotation of the movable plate 310 in an uncontrolled state, and improve the stability of the equipment operation. At the same time, the compression and reset process of the clamping elastic member 314 can provide clear tactile feedback (such as resistance change or slight jamming feeling) for the operator to help confirm that the switching action has been completed.

[0039] Further, the manual switching member 330 includes a mounting shaft 331 and a switching handle 332. The switching handle 332 is assembled and fixed to the mounting shaft 331 through a fixing member 333. After the actuator completes the adjustment and reaches the preset working position, the switching handle 332 can be disassembled to avoid misoperation.

[0040] Further, the piston includes an independent buffer piston 210 and a connecting piston 200. The connecting piston 200 is fixedly connected to the hydraulic rod 220. A buffer space 230 is formed between the buffer piston 210 and the connecting piston 200. The buffer piston 210 and the inner wall of the actuator cavity 110 cooperate to form a rodless cavity 111, and the connecting piston 200 and the inner wall of the actuator cavity 110 cooperate to form a rod cavity 112. A buffer elastic member 211 is provided on one side of the buffer piston 210 facing the buffer space 230, and a corresponding abutting head 201 is provided on the connecting piston 200. The buffer piston 210 and the elastic member act together to absorb the impact force during the movement of the piston, reducing mechanical vibration and noise.

[0041] The protection scope of the present utility model includes but is not limited to the above embodiments. The protection scope of the present utility model is subject to the claims. Any replacement, deformation, and improvement that are easily conceivable by those skilled in the art to the present technology fall within the protection scope of the present utility model.

Claims

1. A manual hydraulic actuator, characterized in that: It comprises a cylinder body (100), wherein an execution chamber (110), an oil storage chamber (120) and an assembly chamber (130) are arranged in the cylinder body (100); A piston is installed in the execution chamber (110), and a hydraulic rod (220) is installed on the piston. The piston divides the execution chamber (110) into a rodless chamber (111) and a rod chamber (112). The rodless chamber (111) is provided with a first channel (113) connected to the assembly chamber (130). The assembly chamber (130), the oil storage chamber (120) and the rod chamber (112) are connected in sequence. The oil storage chamber (120) contains oil and high-pressure gas, and the high-pressure gas is used to pump the oil in the oil storage chamber (120); A manual switching mechanism (300) for opening or closing the first channel (113) is installed in the assembly cavity (130).

2. A manual hydraulic actuator according to claim 1, characterized in that: The manual switching mechanism (300) comprises a movable plate (310), a fixed plate (320) and a manual switching member (330); the fixed plate (320) divides the assembly chamber (130) into a switching chamber (132) and a flow chamber (133); the flow chamber (133) is provided with an oil through hole (121) communicating with the oil storage chamber (120); the movable plate (310) is assembled in the switching chamber (132); the manual switching member (330) passes through the fixed plate (320) and is fixedly assembled with the movable plate (310); the movable plate (310) is provided with a through oil through groove (311) and a mounting groove (312); a pressure retaining valve (400) is installed in the mounting groove (312); the fixed plate (320) is provided with a second channel (321) corresponding to the first channel (113); The actuator switches between the lifting and holding states through a manual switching mechanism (300): when in the lifting state, the oil groove (311) is connected to the first channel (113) and the second channel (321), and the rodless chamber (111) and the oil storage chamber (120) are connected; when in the holding state, the manual switching member (330) is controlled to drive the movable plate (310) to rotate, so that the pressure-maintaining valve (400) closes the first channel (113), and the connection between the rodless chamber (111) and the oil storage chamber (120) is cut off.

3. A manual hydraulic actuator according to claim 2, characterized in that: The pressure-maintaining valve (400) comprises a spring (410), and a first steel ball (420) corresponding to the first channel (113) and a second steel ball (430) corresponding to the second channel (321) are mounted on both sides of the spring (410).

4. A manual hydraulic actuator according to claim 2, characterized in that: The oil-passing groove (311) is an arc-shaped groove, which is arranged on the side of the mounting groove (312) and is connected to the mounting groove (312).

5. A manual hydraulic actuator according to claim 2, characterized in that: When in use, the cylinder body (100) is in an inverted state with the hydraulic rod (220) extending downward. A through pipe (122) is installed in the oil storage chamber (120). One end of the through pipe (122) is fixedly mounted at the oil through hole (121), and the other end extends below the oil level.

6. A manual hydraulic actuator according to claim 2, characterized in that: The manual switching member (330) comprises a mounting shaft (331) and a switching handle (332), and the switching handle (332) is assembled and fixed to the mounting shaft (331) via a fixing member (333).

7. A manual hydraulic actuator according to claim 2, characterized in that: A limit column (134) is arranged in the switching cavity (132), and a switching slide groove (313) cooperating with the limit column (134) is arranged on the movable plate (310); when the movable plate (310) is rotated so that the limit column (134) abuts against one side of the switching slide groove (313), the actuator switches to a lifting state; when the movable plate (310) is rotated so that the limit column (134) abuts against the other side of the switching slide groove (313), the actuator switches to a holding state.

8. A manual hydraulic actuator according to claim 2, characterized in that: A locking elastic member (314) is radially arranged on the movable plate (310), and a locking column (135) is arranged in the switching cavity (132), the locking column (135) being against one side of the locking elastic member (314); when the actuator state is switched, the locking elastic member (314) is blocked by the locking column (135) and retracts, and after the state switching is completed, the locking column (135) is located on the other side of the locking elastic member (314).

9. A manual hydraulic actuator according to claim 1, characterized in that: The piston comprises a buffer piston (210) and a connecting piston (200) which are independent of each other. The connecting piston (200) is connected and fixed to a hydraulic rod (220). A buffer space (230) is formed between the buffer piston (210) and the connecting piston (200). The buffer piston (210) and the inner wall of the execution chamber (110) cooperate to form a rodless chamber (111). The connecting piston (200) and the inner wall of the execution chamber (110) cooperate to form a rod chamber (112). The buffer piston (210) is provided with a buffer elastic member (211) on the side facing the buffer space (230), and the connecting piston (200) is correspondingly provided with an abutment head (201).

10. A manual hydraulic actuator according to claim 1, characterized in that: An actuating valve plate (140), an oil storage valve plate (150) and an assembly valve plate (160) are mounted on the cylinder body (100) and are used to seal the corresponding actuating chamber (110), oil storage chamber (120) and assembly chamber (130).

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