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CN-224228996-U - Electrohydraulic driver

CN224228996UCN 224228996 UCN224228996 UCN 224228996UCN-224228996-U

Abstract

An electrohydraulic driver comprises a hydraulic cylinder and a reservoir cylinder, wherein a piston is arranged in the hydraulic cylinder and is connected with a hydraulic rod, and a cavity in the hydraulic cylinder is divided into a rodless cavity and a rod cavity by the piston. The side of the hydraulic cylinder is provided with an oil storage cavity, an accommodating cavity communicated with the oil storage cavity is arranged in the oil storage cylinder, a valve seat is arranged in the accommodating cavity, a flow passage structure is arranged in the valve seat, and the flow passage structure comprises an extension flow passage, a retraction flow passage, a pump cavity and an oil supplementing flow passage. The extending flow passage and the retracting flow passage are respectively provided with a pressure maintaining component and an oil outlet one-way valve. The pump cavity is communicated with the extending flow channel and the retracting flow channel, an oil pumping assembly is assembled in the pump cavity, and the oil pumping assembly is driven by a motor fixed on the oil storage cylinder. The oil supplementing flow passage is communicated with the pump cavity and the accommodating cavity. The application integrates the components and structures such as the oil pumping component, the flow passage structure and the like into the valve seat, optimizes the overall layout, ensures that the structure is more compact and reasonable, enhances the tightness and the operation stability of the system, prolongs the service life of equipment and reduces the maintenance cost.

Inventors

  • JIN LUPING
  • XU MINWU
  • CHEN HONGCHENG
  • YU ZE

Assignees

  • 潜川(宁波)动力科技有限公司

Dates

Publication Date
20260512
Application Date
20250630

Claims (9)

  1. 1. The electrohydraulic driver comprises a hydraulic cylinder (100) and an oil storage cylinder (200), wherein a piston (110) is assembled in the hydraulic cylinder (100), a hydraulic rod (120) is connected to the piston (110), a cavity in the hydraulic cylinder (100) is divided into a rodless cavity (101) and a rod cavity (102) by the piston (110), and the electrohydraulic driver is characterized in that an oil storage cavity (105) is arranged on the side face of the hydraulic cylinder (100), a containing cavity (201) communicated with the oil storage cavity (105) is arranged in the oil storage cylinder (200), a valve seat (400) is assembled in the containing cavity (201), a flow passage structure (300) is arranged in the valve seat (400), and the flow passage structure (300) comprises: An extension flow passage (310) is communicated with the rodless cavity (101), one end of the extension flow passage (310) communicated with the rodless cavity (101) is provided with an extension assembly cavity (311), a pressure maintaining assembly (500) is assembled in the extension assembly cavity (311), an extension oil outlet passage (350) communicated with the accommodating cavity (201) is connected by the extension flow passage (310), and an oil outlet one-way valve (440) is assembled in the extension oil outlet passage (350); A retraction flow passage (320) communicated with the rod cavity (102), wherein a retraction assembly cavity (321) is arranged at one end of the retraction flow passage (320) connected with the rod cavity (102), a pressure maintaining assembly (500) is assembled in the retraction assembly cavity (321), a retraction oil outlet passage (351) communicated with the accommodating cavity (201) is connected beside the retraction flow passage (320), and an oil outlet check valve (440) is assembled in the retraction oil outlet passage (351); A pump cavity (330) communicated with the extension flow channel (310) and the retraction flow channel (320), wherein an oil pumping assembly (220) is assembled in the pump cavity (330), and the oil pumping assembly (220) is driven by a motor (210) fixed on the oil storage cylinder (200); And the oil supplementing flow passage (340) is communicated with the pump cavity (330) and the accommodating cavity (201).
  2. 2. The electrohydraulic driver of claim 1, wherein said pressure maintaining assembly (500) includes a pressure maintaining valve (510), a cavity (511) is provided in said pressure maintaining valve (510), a pressure maintaining valve core (520) and a pressure maintaining spring (530) are provided in said cavity (511), a first oil through port (512) and a second oil through port (513) are provided at two ends of said cavity (511) along the axial direction, said first oil through port (512) is near to said runner structure (300), said second oil through port (513) is near to said hydraulic cylinder (100), a gap for oil flow is provided between the side surface of said pressure maintaining valve core (520) and the inner wall of said cavity (511); When the hydraulic pressure in the hydraulic cylinder (100) is greater than the hydraulic pressure in the flow passage structure (300), the pressure maintaining valve (510) is closed, the end face of the pressure maintaining valve core (520) is used for blocking the first oil through hole (512) under the action of the pressure maintaining spring (530), when the hydraulic pressure in the flow passage structure (300) is greater than the hydraulic pressure in the hydraulic cylinder (100), the pressure maintaining valve (510) is opened, the pressure maintaining valve core (520) is jacked, and oil can pass through the first oil through hole (512).
  3. 3. The electro-hydraulic driver according to claim 2, wherein the pressure maintaining assembly (500) further comprises an auxiliary valve (540), a third through-hole (541) is formed in the auxiliary valve (540), the auxiliary valve (540) is located on one side, with the first through-hole (512), of the pressure maintaining valve (510) and is connected with the pressure maintaining valve (510) through an auxiliary spring (550), a baffle (560) for blocking the third through-hole (541) is arranged on the other side of the auxiliary valve (540), an auxiliary projection (542) is arranged on one side, facing the pressure maintaining valve (510), of the auxiliary valve (540), a pressure maintaining projection (521) is arranged on the pressure maintaining valve core (520), and when the pressure maintaining valve (510) is in a closed state, the pressure maintaining projection (521) extends out of the first through-hole (512).
  4. 4. The electro-hydraulic driver of claim 1, wherein the oil outlet check valve (440) comprises an oil outlet check valve plate (441), an oil outlet check valve block (442) and an oil outlet check spring (444) which are assembled in sequence, a gap for oil to flow is formed between the side surface of the oil outlet check valve plate (441) and the inner wall of the oil outlet channel, a through groove (443) for oil to flow is formed in the oil outlet check valve block (442), one end of the oil outlet check valve block (444) abuts against the inner wall of the accommodating cavity (201), and the other end of the oil outlet check valve block (442).
  5. 5. An electro-hydraulic drive as claimed in claim 1, wherein the pumping assembly (220) comprises a pair of intermeshing pumping gears (221) and a drive gear (222) driven by the motor (210), the drive gear (222) being meshed with one of the pumping gears (221), the pumping chamber (330) comprising a main chamber (331) for receiving the pumping gears (221) and a side chamber (332) for receiving the drive gear (222), the oil compensating flow passage (340) having two locations, one communicating with the pumping chamber (330) and the other communicating with the side chamber (332).
  6. 6. An electro-hydraulic actuator according to claim 1, wherein the valve seat (400) is provided with a manual relief valve (470) and a relief check valve (480), and the manual relief valve (470) cooperates with the relief check valve (480) to release pressure from the hydraulic cylinder (100); The manual relief valve (470) comprises a control rod (471), a pressure relief rod (472) and a manual relief spring (473), wherein the pressure relief rod (472) is assembled at the bottom of the control rod (471), the manual relief spring (473) is used for helping the control rod (471) to reset, a limiting pin (474) is assembled on the control rod (471), a switching chute (202) matched with the limiting pin (474) is arranged on a shell of the oil storage cylinder (200), the groove depth of one end of the switching chute (202) is larger than the groove depth of the other end, and the groove depths of the two ends respectively correspond to the closed state and the open state of the manual relief valve (470); The manual drainage groove (380) communicated with the accommodating cavity (201) is formed in the valve seat (400), the pressure release rod (472) is located in the manual drainage groove (380), the drainage control groove (106) is formed in the hydraulic cylinder (100) corresponding to the manual drainage groove (380), the pressure release one-way valve is located in the drainage control groove (106), and when the manual drainage valve (470) is opened, the pressure release rod (472) descends and opens the drainage one-way valve (480), and oil in the cavity of the hydraulic cylinder (100) enters the accommodating cavity (201) through the manual drainage groove (380).
  7. 7. The electro-hydraulic driver according to claim 1, wherein the valve seat (400) is further provided with an automatic drain valve, the automatic drain valve comprises a rodless drain valve (460) and a rod-like drain valve (461), the valve seat (400) is provided with a drain channel for assembling the automatic drain valve, and the drain channel is divided into a rodless drain channel (370) communicated with the rodless cavity (101) and a rod-like drain channel (371) communicated with the rod cavity (102) corresponding to the rodless drain valve (460) and the rod-like drain valve (461); The automatic leakage valve comprises a supporting rod (462) and an automatic leakage spring (463), wherein a spherical plug is arranged at the bottom of the supporting rod (462), one end of the automatic leakage spring (463) is propped against the inner wall of the accommodating cavity (201), the other end of the automatic leakage spring is propped against the supporting rod (462), under the action of the automatic leakage spring (463), the spherical plug plugs the leakage flow channel, when the oil pressure of the rod cavity (102) or the rodless cavity (101) exceeds a certain value, the oil pressure pushes the supporting rod (462), and the oil flows through the leakage flow channel into the accommodating cavity (201).
  8. 8. An electro-hydraulic actuator according to claim 1, wherein the valve seat (400) is further provided with a pressure relief flow passage (360), the pressure relief flow passage (360) is communicated with the extension assembly cavity (311) and the retraction assembly cavity (321), a flow passage pressure relief valve (450) is assembled in the pressure relief flow passage (360), and the flow passage structure (300) can be depressurized by manually opening the flow passage pressure relief valve (450).
  9. 9. An electro-hydraulic actuator according to claim 1, wherein a tube (130) is provided in the chamber of the hydraulic cylinder (100), the piston (110) is provided in the tube (130), a space is provided between the tube (130) and the inner wall of the chamber, a spacer ring (140) is provided on the outer wall of the tube (130), the spacer ring (140) divides the space into a rodless connection space (103) communicating with the rodless chamber (101) and a rod connection space (104) communicating with the rod chamber (102), the extension flow passage (310) communicates with the rodless connection space (103), and the retraction flow passage (320) communicates with the rod connection space (104).

Description

Electrohydraulic driver Technical Field The utility model belongs to the technical field of electrohydraulic driving actuating mechanisms, and particularly relates to an electrohydraulic driver. Background The electrohydraulic driver is a device for driving a hydraulic system through electric energy so as to realize mechanical movement, and is widely applied to the fields of industrial automation, engineering machinery, aerospace and the like. It is usually composed of hydraulic cylinder, oil storage cylinder, oil pumping component and other key components. The hydraulic cylinder is used as an executing element, a piston is arranged in the hydraulic cylinder and is connected with an external mechanical device through a hydraulic rod, and hydraulic oil enters the hydraulic cylinder to push the piston to move, so that the control of the external mechanical device is realized. The oil pumping assembly and the flow channel structure are core parts of a hydraulic system and are responsible for conveying hydraulic oil in the oil storage cylinder to the hydraulic cylinder, and accurate control over the movement of the piston is achieved by controlling the flow direction and the pressure of the oil. The existing electrohydraulic driver generally distributes components such as an oil pumping assembly, valves and the like and a flow channel structure on a plurality of mechanisms such as an oil pump, a confluence seat and the like, and the layout has a plurality of defects. First, the dispersion of the components results in an insufficiently compact overall structure, which increases the complexity of production and assembly and reduces production efficiency. And secondly, as the parts are connected more, the sealing difficulty is increased, and leakage points are easy to occur, so that the sealing performance of the system is reduced, the operation stability of equipment is affected, even faults are possibly caused, and the maintenance frequency and cost are increased. Accordingly, the present application has been further designed and developed based on some of the above prior art. Disclosure of utility model In order to solve the technical problems, the utility model is solved by the following technical scheme. An electrohydraulic driver comprises a hydraulic cylinder and a reservoir cylinder, wherein a piston is arranged in the hydraulic cylinder and is connected with a hydraulic rod, and a cavity in the hydraulic cylinder is divided into a rodless cavity and a rod cavity by the piston. The side of the hydraulic cylinder is provided with an oil storage cavity, an accommodating cavity communicated with the oil storage cavity is arranged in the oil storage cylinder, a valve seat is arranged in the accommodating cavity, a flow passage structure is arranged in the valve seat, and the flow passage structure comprises an extension flow passage, a retraction flow passage, a pump cavity and an oil supplementing flow passage. The extending runner is communicated with the rodless cavity, one end of the extending runner, which is communicated with the rodless cavity, is provided with an extending assembly cavity, a pressure maintaining assembly is assembled in the extending assembly cavity, an extending oil duct which is communicated with the accommodating cavity is connected to the extending runner, and an oil outlet check valve is assembled in the extending oil duct. The retraction flow channel is communicated with the rod cavity, a retraction assembly cavity is arranged at one end of the retraction flow channel, which is connected with the rod cavity, and a pressure maintaining assembly is arranged in the retraction assembly cavity; the retraction runner is connected with a retraction oil outlet passage communicated with the accommodating cavity, and an oil outlet check valve is assembled in the retraction oil outlet passage. The pump cavity is communicated with the extending flow channel and the retracting flow channel, an oil pumping assembly is assembled in the pump cavity, and the oil pumping assembly is driven by a motor fixed on the oil storage cylinder. The oil supplementing flow passage is communicated with the pump cavity and the accommodating cavity. The pressure maintaining assembly comprises a pressure maintaining valve, a cavity is formed in the pressure maintaining valve, a pressure maintaining valve core and a pressure maintaining spring are arranged in the cavity, a first oil through port and a second oil through port are arranged at two ends of the cavity along the axial direction, the first oil through port is close to the runner structure, the second oil through port is close to the hydraulic cylinder, and a gap for oil to flow is formed between the side face of the pressure maintaining valve core and the inner wall of the cavity. When the hydraulic pressure in the flow channel structure is greater than the hydraulic pressure in the hydraulic cylinder, the pressure maintaining valve is opened, the pressu