A bidirectional manually operated hydraulic drive mechanism and hydraulic lifting device

Abstract

The present application relates to a kind of bidirectional operation manual hydraulic drive mechanism and hydraulic lifting device, including hydraulic telescopic cylinder with upper oil chamber and lower oil chamber and manual hydraulic drive mechanism, manual hydraulic drive mechanism includes shaft seat, shaft cover, inclined support disc being arranged in shaft seat, hydraulic pipe, eccentric shaft and hollow inner shaft;Shaft seat one end has the oil hole one being communicated with lower oil chamber, shaft seat one end has the vertical hole section and horizontal hole section being communicated, and hydraulic pipe is communicated with upper oil chamber and vertical hole section;Inclined support disc has the inclined pressing surface, eccentric shaft is rotated counterclockwise in shaft seat, eccentric shaft one end has multiple transmission holes, and horizontal hole section is intermittently communicated with oil hole one by transmission hole;Transmission hole is elastically slid with the pressing oil rod one end being abutted on pressing surface;Eccentric shaft is connected with inner shaft by torsion spring, and inner vertical hole section is communicated with lower oil chamber by inner shaft.The present application can conveniently control the up-down movement of hydraulic telescopic cylinder by manual rotation operation, and needs external force to drive when moving downward.

Description

Technical Field

[0001] This invention relates to the field of hydraulic drive technology, and in particular to a bidirectional manual hydraulic drive mechanism and a hydraulic lifting device. Background Technology

[0002] There are various medical rehabilitation devices on the market. Some of these devices utilize electric push rods for bidirectional movement or gas springs for assistance to achieve functions such as support, height adjustment, and angle adjustment. Both electric push rods and gas springs are telescopic components that provide support, height adjustment, and angle adjustment.

[0003] For example, a multi-position treatment bed disclosed in patent publication number CN214713295U uses an electric push rod to adjust the angle of the chest and back bed surface, while the head bed surface, thigh bed surface and calf bed surface are all adjusted by gas springs.

[0004] Currently, electric linear actuators require additional wiring during installation, making connection and installation complex. Since they are powered by electricity, they cease operation when power is cut off. Gas springs, on the other hand, require an operating wrench. Pressing the wrench pulls a cable, which in turn opens and closes the gas spring's pin, controlling its stroke and extension / retraction. This makes operation cumbersome and inconvenient.

[0005] Similarly, if hydraulic cylinders are used as telescopic components in rehabilitation equipment to achieve corresponding functions, related auxiliary facilities such as oil pumps, oil pipes, and directional valves are required. These facilities occupy a lot of space, have complicated pipeline layouts, and have a large number of pipe joints, which increases the risk of hydraulic oil leakage. Summary of the Invention

[0006] To address the problems of complex connection and installation of hydraulic telescopic components, which require a series of supporting facilities for operation, this invention provides a bidirectional manual hydraulic drive mechanism and hydraulic lifting device. Based on a hydraulic cylinder, it is optimized into a manually operated structure, allowing for convenient and quick manual forward and reverse rotation. This enables bidirectional rotational movement, controlling the descent and ascent of the hydraulic cylinder, thus activating its telescopic function. Note that downward movement requires external force. No external piping, oil pumps, or other auxiliary facilities are needed, making installation convenient and quick. The overall structure is simple and easy to operate.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A bidirectional manual hydraulic drive mechanism includes a bearing seat, a bearing cover, an inclined support plate, an eccentric shaft, and a hollow inner shaft that is open at one end and closed at the other.

[0009] The bearing seat is a cylindrical shape that is closed at one end and open at the other end, which facilitates the installation of components. The closed end of the bearing seat has an axially opened oil hole one and a radially opened oil hole two. The oil hole two includes a vertically connected vertical hole section and a horizontal hole section. The open end of the bearing seat is detachably provided with the bearing cover, which facilitates the sealing of the bearing seat.

[0010] The inclined support plate is provided inside the bearing seat. One end face of the inclined support plate is arranged at an inclination to form a pressing surface, which faces the closed end of the bearing seat. The eccentric shaft is arranged inside the bearing seat in a counterclockwise direction, which restricts the rotation direction of the eccentric shaft. The eccentric shaft passes between the inclined support plate and the bearing seat, and the two ends of the eccentric shaft abut against the closed end of the bearing seat and the bearing cover, respectively.

[0011] The eccentric shaft is provided with multiple transmission holes circumferentially at one end near the closed end of the bearing seat. The transverse hole section is intermittently connected to the oil hole through the transmission holes in the rotating state, forming an oil flow channel. Each transmission hole has an oil pressure rod elastically slidably connected inside. One end of the oil pressure rod extends out of the transmission hole and presses against the pressing surface. Under the action of the pressing surface, the oil pressure rod can be made to move axially back and forth in the transmission hole.

[0012] The inner shaft is rotatably connected to the eccentric shaft by a torsion spring. The inner shaft is arranged at the center of the shaft seat, with its open end passing through the eccentric shaft and extending to the outside of the closed end of the shaft seat. The side wall of the open end of the inner shaft has an inner hole, and the vertical hole section corresponds vertically to the inner hole. The closed end of the inner shaft passes through the eccentric shaft and extends to the outside of the shaft cover. The inner shaft rotates counterclockwise to drive the eccentric shaft to rotate.

[0013] Furthermore, the open end of the bearing seat is bolted to the flange of the bearing cover, which facilitates the disassembly and assembly of the bearing cover, and the bearing cover closes the opening of the bearing seat; the first oil hole is eccentrically arranged on the closed end of the bearing seat, and the first oil hole axially penetrates the closed end of the bearing seat and connects the inside and outside of the bearing seat.

[0014] Furthermore, both the vertical hole section and the horizontal hole section are arranged inside the closed end of the bearing seat. After the vertical hole section and the horizontal hole section are connected, the cross section is cross-shaped. The vertical hole section is arranged radially along the bearing seat, and the horizontal hole section is arranged axially along the bearing seat. The upper end of the vertical hole section extends out of the bearing seat, and the lower end extends to the center of the bearing seat.

[0015] Furthermore, the eccentric shaft is a stepped hollow circular shaft with large ends and small middle. Multiple transmission holes are evenly arranged along the circumference of the eccentric shaft. After the eccentric shaft rotates, the multiple transmission holes and the transverse hole section are connected in sequence, and the multiple transmission holes and the oil hole are connected in sequence.

[0016] The transmission hole is a through hole that passes through one end of the eccentric shaft. The transmission hole includes a triangular hole and a cylindrical hole that are interconnected. The triangular hole is arranged on one end face of the eccentric shaft, close to the transverse hole section. The cylindrical hole is arranged in the middle of the triangular hole. The cylindrical hole, the triangular hole and the transverse hole section are connected in sequence.

[0017] Furthermore, the inclined support plate is bolted inside the bearing seat, which facilitates the assembly and disassembly of the inclined support plate. The inclined support plate is a circular disc with an "I"-shaped cross-section. The middle part of the inclined support plate is sleeved on the outer side of the middle part of the eccentric shaft, and one end face of the middle part of the inclined support plate is a pressing surface.

[0018] The pressure rod is slidably disposed within the cylindrical hole. The pressure rod includes an integrally formed cylindrical section, a limiting plate section, and a round head section. The cylindrical section, the limiting plate section, and the round head section are connected in sequence. The cylindrical section slides within the cylindrical hole, and the diameter of the cylindrical section is the same as the inner diameter of the cylindrical hole. One end of the cylindrical section extends out of the cylindrical hole and is connected to the limiting plate section. The limiting plate section is larger than the cylindrical section. A compression spring is sleeved on the cylindrical section between the limiting plate section and the end face of the cylindrical hole. The compression spring causes the pressure rod to extend out of the transmission hole, and the round head section is tightly pressed against the pressing surface.

[0019] Furthermore, a large bearing is provided between the shaft cover and the eccentric shaft to facilitate the rotation of the eccentric shaft. A ratchet is provided at the other end of the eccentric shaft, and a pawl is provided on the edge of the inclined support plate through a torsion spring. The pawl abuts against the ratchet and restricts the clockwise rotation of the eccentric shaft.

[0020] Furthermore, the inner shaft is sequentially inserted between the center of the shaft cover, the eccentric shaft, and the shaft seat. The closed end of the inner shaft extends out of the shaft cover and is connected to a wrench, which facilitates the operation of the inner shaft to make it rotate. A small bearing is provided between the inner shaft and the eccentric shaft to facilitate the rotation of the inner shaft. The inner shaft can rotate counterclockwise or clockwise.

[0021] The inner hole connects to the inside of the inner shaft, and the clockwise rotation of the inner shaft drives the inner hole and the vertical hole section to connect.

[0022] Furthermore, a rotating block is provided on the inner shaft, the rotating block protruding from the side wall of the inner shaft, and a rotating groove bent into a semi-circular arc is opened inside the eccentric shaft. The torsion spring is sleeved on the inner shaft, one end of the torsion spring abutting against the rotating groove and the other end abutting against the rotating block, and the rotating block abutting against one end of the rotating groove.

[0023] A two-way operating manual hydraulic lifting device includes the aforementioned manual hydraulic drive mechanism, and also includes a hydraulic telescopic cylinder with an upper oil chamber and a lower oil chamber. The upper oil chamber and the lower oil chamber are connected through the manual hydraulic drive mechanism, which facilitates the control of the oil volume in the upper oil chamber and the lower oil chamber through the manual hydraulic drive mechanism.

[0024] The bearing seat is arranged laterally, and the closed end of the bearing seat is connected and fixed to the lower side wall of the hydraulic telescopic cylinder. The oil hole penetrates through the side wall of the hydraulic telescopic cylinder and communicates with the lower oil chamber. A hydraulic pipe is connected between the upper oil chamber and the vertical hole section to facilitate the entry of oil into the vertical hole section and the horizontal hole section. The open end of the inner shaft is connected to the lower oil chamber, and the vertical hole section is connected to the lower oil chamber through the inner hole.

[0025] Furthermore, the hydraulic telescopic cylinder includes a cylinder body and a rod piston. The cylinder body is a hollow cylinder with an inner circle and an outer square shape, and both ends are closed. The closed end of the shaft seat is connected to the flange on the lower side wall of the cylinder body, which facilitates the disassembly and assembly of the shaft seat. The bottom of the cylinder body has a flange plate, which facilitates the installation of the hydraulic telescopic cylinder on the corresponding carrier. The rod piston is slidably mounted on the cylinder body. The two ends of the rod piston are respectively arranged inside and outside the cylinder body. The rod piston divides the inner cavity of the cylinder body into an upper oil chamber and a lower oil chamber.

[0026] The oil hole passes through the side wall of the cylinder and communicates with the lower oil chamber. A central hole is provided on the side wall of the hydraulic telescopic cylinder, and the open end of the inner shaft communicates with the lower oil chamber through the central hole.

[0027] The beneficial effects of the present invention through the above technical solution are:

[0028] The invention features a simple structure and convenient operation. Manually rotating the inner shaft clockwise connects the vertical section to the lower oil chamber through the inner hole, thereby connecting the upper and lower oil chambers vertically. At this point, an external force is required to drive the cylinder downward, i.e., the load weight on the hydraulic telescopic cylinder drives the piston with rod to move downward, which facilitates the retraction of the hydraulic telescopic cylinder.

[0029] This invention involves manually rotating the inner shaft counterclockwise, causing the eccentric shaft to rotate as well, with multiple hydraulic rods on the eccentric shaft rotating accordingly. During the rotation of the eccentric shaft, oil in the upper oil chamber enters the transmission hole, and the hydraulic rods, compressed by the pressing surface, gradually extend into the transmission hole, pressurizing the oil until the transmission hole and the lower oil chamber are connected. Oil at a certain pressure then enters the lower oil chamber, pushing the piston with rod upwards. Simultaneously, the oil in the upper oil chamber re-enters the empty transmission hole, and the ratchet and pawl structure locks the hydraulic cylinder with each press. This repetitive motion enables the extension of the hydraulic telescopic cylinder.

[0030] This invention features its own power supply and piping, eliminating the need for additional wiring and power sources. It is easy to install, unaffected by power outages, and can operate at any time. The hydraulic telescopic cylinder's descent or ascent can be controlled manually by rotating the inner shaft clockwise or counterclockwise. This simple hydraulic lifting structure, coupled with convenient and quick manual operation, makes it suitable for a wide range of applications, particularly in the field of rehabilitation medical devices. Attached Figure Description

[0031] Figure 1 This is an isometric view of a bidirectional manual hydraulic drive mechanism according to the present invention.

[0032] Figure 2 This is a cross-sectional view of a bidirectional manual hydraulic drive mechanism according to the present invention.

[0033] Figure 3 This invention relates to a bidirectional manually operated hydraulic drive mechanism. Figure 2 A magnified view of a portion of the image.

[0034] Figure 4 This is a schematic diagram showing the separation of the bearing seat and bearing cover of a bidirectional manual hydraulic drive mechanism according to the present invention.

[0035] Figure 5 This is a schematic diagram showing the separation of the eccentric shaft and bearing seat in a bidirectional manual hydraulic drive mechanism according to the present invention.

[0036] Figure 6 This is a cross-sectional view of the inclined support plate and bearing seat installation of a bidirectional manual hydraulic drive mechanism according to the present invention.

[0037] Figure 7 This invention relates to a bidirectional manually operated hydraulic drive mechanism. Figure 4 Schematic diagram of ratchet and pawl engagement in the AA direction.

[0038] Figure 8 This is one of the isometric views of the inclined support plate and eccentric shaft installation of a bidirectional manual hydraulic drive mechanism according to the present invention.

[0039] Figure 9 This is the second isometric view of the inclined support plate and eccentric shaft mounting of a bidirectional manual hydraulic drive mechanism according to the present invention.

[0040] Figure 10 This is an isometric view of the inclined support plate and eccentric shaft of a bidirectional manual hydraulic drive mechanism according to the present invention.

[0041] Figure 11 This invention relates to a bidirectional manually operated hydraulic drive mechanism. Figure 10 A sectional view.

[0042] Figure 12 This is an isometric view of a bidirectional manual hydraulic lifting device according to the present invention.

[0043] Figure 13 This is a cross-sectional view of a two-way manually operated hydraulic lifting device according to the present invention.

[0044] Figure 14 This is a cross-sectional view of the shaft seat and cylinder body installation of a bidirectional manual hydraulic lifting device according to the present invention.

[0045] Figure 15 This invention relates to a bidirectional manual hydraulic lifting device. Figure 14 A magnified view of a portion of the image.

[0046] The reference numerals in the drawings are: 1 upper oil cavity, 2 lower oil cavity, 3 hydraulic telescopic cylinder, 31 cylinder block, 32 piston with rod, 4 large oil hole, 5 flange plate, 6 shaft seat, 7 shaft cover, 8 hydraulic pipe, 9 eccentric shaft, 10 inner shaft, 11 oil hole one, 12 vertical hole section, 13 horizontal hole section, 14 large bearing, 15 ratchet wheel, 16 ratchet pawl, 17 transmission hole, 171 triangular hole, 172 cylindrical hole, 18 small bearing, 19 wrench, 20 rotating block, 21 rotating groove, 22 torsion spring, 23 central hole, 24 inner hole, 25 inclined support plate, 26 pressing surface, 27 oil pressing rod, 271 cylindrical section, 272 limit disk section, 273 round head section, 28 compression spring. Detailed implementation manners

[0047] The following makes a detailed description of the specific implementation manners of the present invention in conjunction with the drawings:

[0048] As Figures 1-11 shown, a manually hydraulic drive mechanism with bidirectional operation includes a shaft seat 6, a shaft cover 7, an inclined support plate 25, an eccentric shaft 9, and a hollow inner shaft 10 with one end open and the other end closed.

[0049] The shaft seat 6 is in the shape of a cylinder with one end closed and the other end open. The interior of the shaft seat 6 is a cylindrical cavity with a "convex" cross-section. An oil hole one 11 is axially opened at the closed end of the shaft seat 6. The oil hole one 11 is a circular hole and is eccentrically arranged on the closed end of the shaft seat 6, that is, it is not at the center position of the shaft seat 6. After the oil hole one 11 axially penetrates the closed end of the shaft seat 6, it communicates the inside and outside of the shaft seat 6.

[0050] An oil hole two is also radially opened at the closed end of the shaft seat 6. The oil hole two includes a vertically connected vertical hole section 12 and a horizontal hole section 13. Both the vertical hole section 12 and the horizontal hole section 13 are arranged inside the closed end of the shaft seat 6. After the vertical hole section 12 and the horizontal hole section 13 are connected, the cross-section is in the shape of a cross. The vertical hole section 12 is arranged radially along the shaft seat 6. The upper end of the vertical hole section 12 extends out of the shaft seat 6, and the lower end extends to the center of the shaft seat 6. The horizontal hole section 13 is a blind hole and is arranged axially along the shaft seat 6. The arrangement direction of the horizontal hole section 13 is the same as the arrangement direction of the oil hole one 11.

[0051] The shaft cover 7 is detachably arranged at the open end of the shaft seat 6. Specifically, the open end of the shaft seat 6 and the shaft cover 7 are flange bolt-connected, so that the shaft cover 7 can be connected and fixed to the shaft seat 6. The shaft cover 7 closes the open end of the shaft seat 6, that is, the shaft cover 7 can be used to close the open position of the shaft seat 6, thereby realizing the closure of the internal space of the shaft seat 6.

[0052] An inclined support disc 25 is provided inside the bearing seat 6. The inclined support disc 25 is bolted to the inside of the bearing seat 6 to achieve the installation and fixation of the inclined support disc 25. The inclined support disc 25 abuts against the shoulder of the bearing seat 6. The inclined support disc 25 is a disc with an "I"-shaped cross-section. One end face of the inclined support disc 25 is inclined to form a pressing surface 26, that is, the middle end face of the inclined support disc 25 is the pressing surface 26. The pressing surface 26 is an annular surface and faces the closed end of the bearing seat 6.

[0053] An eccentric shaft 9 is mounted counterclockwise within the bearing seat 6, specifically restricting its rotation to a counterclockwise direction. The eccentric shaft 9 is a stepped hollow circular shaft, larger at both ends and smaller in the middle. It passes between the inclined support plate 25 and the bearing seat 6, rotating between them. The middle portion of the inclined support plate 25 is fitted over the outer side of the middle portion of the eccentric shaft 9. Both ends of the eccentric shaft 9 abut against the closed end of the bearing seat 6 and the bearing cover 7, respectively, restricting its axial movement. A large bearing 14 is positioned between the bearing cover 7 and the eccentric shaft 9 to improve the smoothness of its rotation.

[0054] When the eccentric shaft 9 rotates, it is restricted to rotating only counterclockwise and not clockwise. This unidirectional rotation of the eccentric shaft 9 is achieved using a ratchet and pawl structure. Specifically, a ratchet 15 is integrally formed with the eccentric shaft 9 at its other end. Simultaneously, a pawl 16 is rotatably mounted on the edge of the inclined support disc 25 via a torsion spring. The installation of the pawl 16 is existing technology, employing a torsion spring and shaft engagement. After installation, the pawl 16 tends to rotate counterclockwise under the action of the torsion spring, thus pressing against the ratchet 15. This restricts the clockwise rotation of the eccentric shaft 9, allowing it to rotate only counterclockwise.

[0055] A sealing ring is fitted onto the right end face of the eccentric shaft 9 to ensure that hydraulic oil does not leak between the right end face of the eccentric shaft 9 and the inner wall of the closed end of the shaft seat 6. Simultaneously, a sealing ring is fitted onto the outer circumferential surface of the right end of the eccentric shaft 9 to ensure that hydraulic oil does not leak between the outer circumferential surface of the eccentric shaft 9 and the inner circumferential surface of the closed end of the shaft seat 6. The sealing rings are not shown in the figure.

[0056] It should be noted that: since the inclined support plate 25 is fitted on the outside of the eccentric shaft 9, to facilitate the installation of the inclined support plate 25, the eccentric shaft 9 can be designed as a split structure. Here, it is broken at the small diameter section of the eccentric shaft 9. The break point can be found by referring to... Figure 3 , 4 The dotted line on the eccentric shaft 9 in section 5 indicates the break point of the eccentric shaft 9. After breaking, the eccentric shaft 9 consists of two parts, left and right. When the two parts are joined, protrusions and grooves are respectively provided on the two end faces of the joint. By inserting the protrusions and grooves, the split eccentric shaft 9 can be joined together, and the left and right parts of the eccentric shaft 9 can rotate together.

[0057] Six transfer holes 17 are provided circumferentially at one end of the eccentric shaft 9 near the closed end of the bearing seat 6. The six transfer holes 17 are evenly arranged along the circumference of the eccentric shaft 9. The transfer holes 17 are through holes, passing through one end of the eccentric shaft 9. The transfer holes 17 include interconnected triangular holes 171 and cylindrical holes 172. The triangular holes 171 are arranged on one end face of the eccentric shaft 9, near the transverse hole section 13. The cylindrical hole 172 is arranged in the middle of the triangular holes 171. The cylindrical hole 172, the triangular holes 171, and the transverse hole section 13 are connected sequentially along the axial direction of the bearing seat 6.

[0058] The function of the transfer hole 17 is to connect the transverse hole section 13 and the oil hole 11. Specifically, the transverse hole section 13 is intermittently connected to the oil hole 11 through the transfer hole 17 in the rotating state. That is, after the eccentric shaft 9 rotates, the six transfer holes 17 and the transverse hole section 13 are connected in sequence, and the six transfer holes 17 and the oil hole 11 are connected in sequence.

[0059] During the rotation of the eccentric shaft 9, the six transmission holes 17 rotate simultaneously. Each transmission hole 17 passes through the transverse hole section 13 and then the oil hole 11 during its rotation. When a transmission hole 17 corresponds to the transverse hole section 13, the two are connected; when a transmission hole 17 corresponds to the oil hole 11, the two are connected. When any one transmission hole 17 corresponds to and is connected to the transverse hole section 13, another transmission hole 17 simultaneously corresponds to and is connected to the oil hole 11. When the pawl 16 engages the ratchet 15, the eccentric shaft 9 does not rotate. At this time, the transmission holes 17 do not correspond to the oil hole 11 or the transverse hole section 13, thus disconnecting the flow channel of the hydraulic oil medium. Only during the rotation of the eccentric shaft 9 can the oil hole 11 and the transverse hole section 13 be connected through the transmission holes 17.

[0060] Each transfer hole 17 is elastically slidably fitted with an oil pressure rod 27, which can slide axially within the transfer hole 17. One end of the oil pressure rod 27 extends out of the transfer hole 17 and abuts against the pressing surface 26. Specifically, the oil pressure rod 27 is slidably disposed within the cylindrical hole 172, and the oil pressure rod 27 includes an integrally formed cylindrical section 271, a limiting plate section 272, and a round head section 273, which are connected in sequence.

[0061] The cylindrical section 271 slides inside the cylindrical hole 172. The diameter of the cylindrical section 271 is the same as the inner diameter of the cylindrical hole 172. One end of the cylindrical section 271 extends out of the cylindrical hole 172 and connects to the limiting plate section 272. The round head section 273 at one end of the limiting plate section 272 is pressed tightly against the pressing surface 26.

[0062] To achieve elastic sliding of the pressure rod 27, the limiting plate section 272 is larger than the cylindrical section 271, and a compression spring 28 is sleeved on the cylindrical section 271 between the limiting plate section 272 and the end face of the cylindrical hole 172. Thus, during the rotation of the eccentric shaft 9, the pressure rod 27 rotates along with it. Under the action of the compression spring 28, the end of the pressure rod 27 presses tightly against the pressing surface 26. Since the pressing surface 26 is an inclined surface, it presses and releases the pressure rod 27, enabling the pressure rod 27 to reciprocate within the transmission hole 17. When the pressure rod 27 extends to its maximum length outside the transmission hole 17, it corresponds to the transverse hole section 13; when the pressure rod 27 is about to retract to its maximum length inside the transmission hole 17, it corresponds to the oil hole 11.

[0063] To drive the eccentric shaft 9, an inner shaft 10 is rotatably connected inside the eccentric shaft 9 via a torsion spring 22. The inner shaft 10 is located at the center of the bearing seat 6 and passes sequentially between the bearing cover 7, the eccentric shaft 9, and the center of the bearing seat 6. To improve the smoothness of the rotation of the inner shaft 10, a small bearing 18 is provided between the inner shaft 10 and the eccentric shaft 9.

[0064] The inner shaft 10 can rotate counterclockwise or clockwise. When the inner shaft 10 rotates counterclockwise, it drives the eccentric shaft 9 to rotate. That is, only when the inner shaft 10 rotates counterclockwise can it drive the eccentric shaft 9 to rotate. When the inner shaft 10 rotates clockwise by a certain angle, the eccentric shaft 9 does not rotate with it.

[0065] The inner shaft 10 controls the rotation of the eccentric shaft 9 by having a rectangular rotating block 20 protruding from the side wall of the inner shaft 10. The eccentric shaft 9 has a semi-circular rotating groove 21 inside. A torsion spring 22 is fitted onto the inner shaft 10, with one end abutting against the rotating groove 21 and the other end against the rotating block 20. The torsion spring 22 causes the rotating block 20 to abut against one end of the rotating groove 21, causing the inner shaft 10 to rotate counterclockwise. Thus, when the inner shaft 10 rotates counterclockwise, the rotating block 20 abuts against one end of the rotating groove 21, smoothly driving the eccentric shaft 9 to rotate. Only when the inner shaft 10 rotates clockwise does it need to overcome the force of the torsion spring 22. That is, if the inner shaft 10 rotates clockwise, it needs to overcome the force of the torsion spring 22, and the rotating block 20 is no longer obstructed by the rotating groove 21; the inner shaft 10 will not drive the eccentric shaft 9 to rotate.

[0066] The closed end of the inner shaft 10 extends out of the eccentric shaft 9 and beyond the shaft cover 7. A wrench 19 is connected to the closed end of the inner shaft 10 through the shaft cover 7 to facilitate the rotation of the inner shaft 10. The open end of the inner shaft 10 extends out of the eccentric shaft 9 and beyond the closed end of the shaft seat 6. An inner hole 24 is provided on the side wall of the open end of the inner shaft 10. The inner hole 24 is a tapered hole and communicates with the interior of the inner shaft 10.

[0067] The vertical hole section 12 corresponds vertically to the inner hole 24, but they are not connected initially. The inner shaft 10 rotates clockwise, driving the inner hole 24 and the vertical hole section 12 to connect. That is, only when the inner shaft 10 rotates clockwise, overcoming the force of the torsion spring 22, will the inner shaft 10 deflect, causing the inner hole 24 to rotate and connect with the vertical hole section 12. Once the inner shaft 10 is no longer controlled, the torsion spring 22 drives it to rotate counterclockwise, and the inner hole 24 and the vertical hole section 12 are no longer connected.

[0068] The operating principle of the manual hydraulic drive mechanism is as follows: The vertical section 12 is connected to a pressurized hydraulic oil storage space A, and the open end of the inner shaft 10 and oil hole 11 are simultaneously connected to another pressurized hydraulic oil storage space B. The inner shaft 10 controls the eccentric shaft 9 to rotate counterclockwise, causing each transmission hole 17 to first pass through the horizontal section 13 and then through oil hole 11. After the eccentric shaft 9 rotates, the six transmission holes 17 and the horizontal section 13 are sequentially connected, and the six transmission holes 17 and the oil hole 11 are sequentially connected, thus enabling the hydraulic oil in hydraulic oil storage space A to be manually pumped into hydraulic oil storage space B.

[0069] Simultaneously, it can also achieve the following: Rotating the inner shaft 10 clockwise causes the vertical hole section 12 to connect with the hydraulic oil storage space B through the inner hole 24. This allows the hydraulic oil in hydraulic oil storage spaces A and B to be interconnected. External force can then be used to force the hydraulic oil in hydraulic oil storage space B into hydraulic oil storage space A. If hydraulic oil storage spaces A and B are two separate oil chambers within the hydraulic cylinder, the lifting and lowering of the hydraulic cylinder can be controlled by a manual hydraulic drive mechanism. Lowering requires external force.

[0070] like Figures 12-15 As shown, a bidirectional manual hydraulic lifting device includes a manual hydraulic drive mechanism and a hydraulic telescopic cylinder 3 with an upper oil chamber 1 and a lower oil chamber 2. The operation of the hydraulic telescopic cylinder 3 can be controlled by the manual hydraulic drive mechanism. The hydraulic telescopic cylinder 3 has a similar structure to a conventional hydraulic cylinder. Here, the hydraulic telescopic cylinder 3 includes a cylinder body 31 and a rod piston 32. The rod piston 32 is slidably mounted on the cylinder body 31, and its two ends are respectively arranged inside and outside the cylinder body 31.

[0071] Unlike conventional hydraulic cylinders, the cylinder body 31 is a hollow cylinder with an inner circle and outer square shape, closed at both ends. The bottom of the cylinder body 31 has a flange plate 5 for easy installation of the hydraulic telescopic cylinder 3. The rod piston 32 divides the inner cavity of the cylinder body 31 into an upper oil chamber 1 and a lower oil chamber 2. The upper oil chamber 1 and lower oil chamber 2 are connected by a manual hydraulic drive mechanism. This mechanism is manually operated and controls the up-and-down movement of the rod piston 32. Specifically, the manual hydraulic drive mechanism controls the amount of hydraulic oil in the upper oil chamber 1 and lower oil chamber 2, thereby controlling the up-and-down movement of the rod piston 32.

[0072] When the manual hydraulic drive mechanism is installed with the hydraulic telescopic cylinder 3, the bearing seat 6 is arranged laterally, thus perpendicular to the cylinder body 31. The closed end of the bearing seat 6 is connected and fixed to the lower side wall of the hydraulic telescopic cylinder 3. Specifically, the closed end of the bearing seat 6 is connected to the flange of the lower side wall of the cylinder body 31, thereby realizing the installation and fixation of the bearing seat 6 and the cylinder body 31. After installation, the upper part of the pressing surface 26 on the inner inclined support plate 25 of the bearing seat 6 is closer to the cylinder body 31, and the lower part is farther from the cylinder body 31.

[0073] Oil hole 11 must be connected to the lower oil chamber 2. Specifically, oil hole 11 penetrates the side wall of the hydraulic telescopic cylinder 3 and connects to the lower oil chamber 2, that is, oil hole 11 passes through the side wall of the cylinder body 31 and connects to the lower oil chamber 2. This can be achieved by extending oil hole 11 so that it protrudes outward from the closed end face of the bearing seat 6, allowing it to pass through the cylinder body 31 and connect to the lower oil chamber 2. Alternatively, a large oil hole 4 can be formed by drilling a hole in the side wall of the cylinder body 31, with the large oil hole 12 corresponding to and connected to oil hole 11, thus connecting oil hole 11 to the lower oil chamber 2.

[0074] The open end of the inner shaft 10 is connected to the lower oil chamber 2. Specifically, a central hole 23 is provided on the side wall of the hydraulic telescopic cylinder 3, and the central hole 23 is connected to the open end of the inner shaft 10. The open end of the inner shaft 10 is connected to the lower oil chamber 2 through the central hole 23. In this way, the vertical hole section 12 can be connected to the lower oil chamber 2 through the inner hole 24.

[0075] A hydraulic pipe 8 connects the upper oil chamber 1 and the vertical hole section 12. The hydraulic pipe 8 is a rigid pipe and is arranged vertically along the cylinder body 31. During installation, the upper end of the hydraulic pipe 8 connects to the upper oil chamber 1 and the lower end connects to the vertical hole section 12. That is, after the upper end of the hydraulic pipe 8 is bent, it passes through the side wall of the cylinder body 31 and connects to the upper oil chamber 1. The lower end of the hydraulic pipe 8 extends into the vertical hole section 12 and connects the vertical hole section 12 and the horizontal hole section 13.

[0076] Before using the manual hydraulic lifting device: First, fill the upper oil chamber 1 and lower oil chamber 2 with hydraulic oil at a certain pressure to ensure that the hydraulic oil naturally diffuses into the connected pipes and channels. At the same time, two sealing rings are fitted on the rod piston 32 to ensure that the rod piston 32 can effectively isolate the upper oil chamber 1 and lower oil chamber 2. The sealing rings are not shown in the figure.

[0077] In the initial state, the torsion spring 22 drives the inner shaft 10 to rotate counterclockwise, thus the inner hole 24 and the vertical hole section 12 are not connected, and at the same time the transmission hole 17 is not connected to the oil hole 11. As a result, the oil in the upper oil chamber 1 and the lower oil chamber 2 is not connected. The oil content in the upper oil chamber 1 and the lower oil chamber 2 is constant, thus the piston 32 of the hydraulic telescopic cylinder 3 remains fixed, which can provide stable support for the load.

[0078] When the hydraulic telescopic cylinder 3 needs to move downwards, the operating wrench 19 overcomes the resistance of the torsion spring 22, causing the inner shaft 10 to rotate clockwise. This connects the inner hole 24 and the vertical hole section 12. Since the inner hole 24 connects to the lower oil chamber 2 and the vertical hole section 12 connects to the upper oil chamber 1, the upper oil chamber 1 and the lower oil chamber 2 also connect. The downward movement is driven by the weight of the load, i.e., by external force. Specifically, the load provides downward pressure on the rod piston 32, causing it to descend. Consequently, the oil in the lower oil chamber 2 flows into the upper oil chamber 1 through the central hole 23, the inner hole 24, the vertical hole section 12, and the hydraulic pipe 8, thus retracting the hydraulic telescopic cylinder 3.

[0079] When the hydraulic telescopic cylinder 3 needs to move upward, the operating wrench 19 directly drives the inner shaft 10 to rotate counterclockwise, and then the eccentric shaft 9 rotates together. The transmission hole 17 on the eccentric shaft 9 first connects with the horizontal hole section 13. At this time, the pressure rod 27 in the transmission hole 17 extends out of the transmission hole 17 to the maximum extent, and then the oil in the horizontal hole section 13 enters into the transmission hole 17, and the oil in the upper oil chamber 1 decreases. As the eccentric shaft 9 rotates, it drives the transmission hole 17 to move downward in the circumferential direction. During this process, the pressure rod 27 is squeezed by the pressing surface 26 and gradually enters into the transmission hole 17, causing the hydraulic oil pressure to increase until the transmission hole 17 connects with the oil hole 11. The hydraulic oil pressure is released, and then the oil in the transmission hole 17 flows into the lower oil chamber 2 through the oil hole 11. The increase in oil in the lower oil chamber 2 pushes the piston 32 with rod upward. At this time, the empty transmission hole 17 connects with the vertical hole section 12, and then the oil in the upper oil chamber 1 enters the empty transmission hole 17 through the oil pipe 8.

[0080] Since there are six transmission holes 17, the hydraulic fluid in the upper oil chamber 1 can be continuously pumped into the lower oil chamber 2 by rotating the eccentric shaft 9. The increased fluid in the lower oil chamber 2 then raises the piston 32 with the rod, thus extending the hydraulic telescopic cylinder 3. Because the eccentric shaft 9 cannot rotate clockwise, it prevents hydraulic oil backflow. This invention is well-suited for telescopic motion structures in the field of rehabilitation medical devices, featuring a simple design and convenient operation.

[0081] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention should be included within the scope of the present invention.

Claims

1. A bidirectional manual hydraulic drive mechanism, characterized in that, It includes a bearing seat (6), a bearing cap (7), an inclined support plate (25), an eccentric shaft (9), and a hollow inner shaft (10) that is open at one end and closed at the other end. The bearing seat (6) is a cylindrical shape with one end closed and the other end open. The closed end of the bearing seat (6) is provided with an oil hole one (11) axially and an oil hole two is provided with an oil hole two radially. The oil hole two includes a vertically connected vertical hole section (12) and a horizontal hole section (13). The open end of the bearing seat (6) is detachably provided with the bearing cover (7). The inclined support plate (25) is provided inside the bearing seat (6). One end face of the inclined support plate (25) is arranged at an inclination to form a pressing surface (26). The pressing surface (26) faces the closed end of the bearing seat (6). The eccentric shaft (9) is provided inside the bearing seat (6) in a counterclockwise rotation. The eccentric shaft (9) passes between the inclined support plate (25) and the bearing seat (6). The two ends of the eccentric shaft (9) abut against the closed end of the bearing seat (6) and the shaft cover (7), respectively. The eccentric shaft (9) is provided with multiple transmission holes (17) around the closed end near the bearing seat (6). The transverse hole section (13) is intermittently connected to the oil hole (11) through the transmission holes (17) in the rotating state. Each transmission hole (17) is elastically slidably connected with an oil pressure rod (27). One end of the oil pressure rod (27) extends out of the transmission hole (17) and abuts against the pressing surface (26). The inner shaft (10) is rotatably connected to the eccentric shaft (9) by a torsion spring (22). The inner shaft (10) is arranged in the center of the bearing seat (6). The open end of the inner shaft (10) passes through the eccentric shaft (9) and extends to the outside of the closed end of the bearing seat (6). The side wall of the open end of the inner shaft (10) is provided with an inner hole (24). The vertical hole section (12) corresponds to the inner hole (24) vertically. The closed end of the inner shaft (10) passes through the eccentric shaft (9) and extends to the outside of the bearing cover (7). The inner shaft (10) rotates counterclockwise to drive the eccentric shaft (9) to rotate.

2. The bidirectional manual hydraulic drive mechanism according to claim 1, characterized in that, The open end of the bearing seat (6) is bolted to the flange of the bearing cover (7), and the bearing cover (7) closes the opening of the bearing seat (6); the first oil hole (11) is eccentrically arranged on the closed end of the bearing seat (6), and the first oil hole (11) axially penetrates the closed end of the bearing seat (6) and connects the inside and outside of the bearing seat (6).

3. The bidirectional manual hydraulic drive mechanism according to claim 1, characterized in that, The vertical hole section (12) and the horizontal hole section (13) are both arranged inside the closed end of the bearing seat (6). After the vertical hole section (12) and the horizontal hole section (13) are connected, the cross section is cross-shaped. The vertical hole section (12) is arranged radially along the bearing seat (6), and the horizontal hole section (13) is arranged axially along the bearing seat (6). The upper end of the vertical hole section (12) extends out of the bearing seat (6), and the lower end extends to the center of the bearing seat (6).

4. The bidirectional manual hydraulic drive mechanism according to claim 1, characterized in that, The eccentric shaft (9) is a stepped hollow circular shaft with large ends and small middle. Multiple transmission holes (17) are evenly arranged around the eccentric shaft (9). After the eccentric shaft (9) rotates, the multiple transmission holes (17) and the transverse hole section (13) are connected in sequence, and the multiple transmission holes (17) and the oil hole one (11) are connected in sequence. The transfer hole (17) is a through hole that passes through one end of the eccentric shaft (9). The transfer hole (17) includes a triangular hole (171) and a cylindrical hole (172) that are connected to each other. The triangular hole (171) is arranged on one end face of the eccentric shaft (9) and is close to the transverse hole section (13). The cylindrical hole (172) is arranged in the middle of the triangular hole (171). The cylindrical hole (172), the triangular hole (171) and the transverse hole section (13) are connected in sequence.

5. A bidirectional manual hydraulic drive mechanism according to claim 4, characterized in that, The inclined support plate (25) is bolted inside the bearing seat (6). The inclined support plate (25) is a circular disc with an "I" shaped cross section. The middle part of the inclined support plate (25) is sleeved on the outer side of the middle part of the eccentric shaft (9). One end face of the middle part of the inclined support plate (25) is a pressing surface (26). The oil pressure rod (27) is slidably disposed in the cylindrical hole (172). The oil pressure rod (27) includes an integrally formed cylindrical section (271), a limiting plate section (272), and a round head section (273). The cylindrical section (271), the limiting plate section (272), and the round head section (273) are connected in sequence. The cylindrical section (271) slides in the cylindrical hole (172). The diameter of the cylindrical section (271) is the same as the inner diameter of the cylindrical hole (172). One end of the cylindrical section (271) extends out of the cylindrical hole (172) and is connected to the limiting plate section (272). The size of the limiting plate section (272) is larger than that of the cylindrical section (271). A compression spring (28) is provided on the cylindrical section (271) between the end face of the limiting plate section (272) and the cylindrical hole (172). The round head section (273) is tightly pressed against the pressing surface (26).

6. The bidirectional manual hydraulic drive mechanism according to claim 1, characterized in that, A large bearing (14) is provided between the shaft cover (7) and the eccentric shaft (9). A ratchet (15) is provided at the other end of the eccentric shaft (9). A pawl (16) is provided on the edge of the inclined support plate (25) through a torsion spring. The pawl (16) abuts against the ratchet (15) and restricts the eccentric shaft (9) from rotating clockwise.

7. The bidirectional manual hydraulic drive mechanism according to claim 1, characterized in that, The inner shaft (10) is sequentially inserted between the center of the shaft cover (7), the eccentric shaft (9) and the shaft seat (6). The closed end of the inner shaft (10) passes through the shaft cover (7) and is connected to a wrench (19). A small bearing (18) is provided between the inner shaft (10) and the eccentric shaft (9). The inner shaft (10) rotates counterclockwise or clockwise. The inner hole (24) is connected to the inside of the inner shaft (10). The inner shaft (10) rotates clockwise to drive the inner hole (24) and the vertical hole section (12) to connect.

8. A bidirectional manual hydraulic drive mechanism according to claim 7, characterized in that, A rotating block (20) is provided on the inner shaft (10). The rotating block (20) protrudes from the side wall of the inner shaft (10). The eccentric shaft (9) has a rotating groove (21) bent into a semi-circular arc shape inside. The torsion spring (22) is sleeved on the inner shaft (10). One end of the torsion spring (22) abuts against the rotating groove (21) and the other end abuts against the rotating block (20). The rotating block (20) abuts against one end of the rotating groove (21).

9. A two-way operating manual hydraulic lifting device, characterized in that, The manual hydraulic drive mechanism according to any one of claims 1 to 8 further includes a hydraulic telescopic cylinder (3) with an upper oil chamber (1) and a lower oil chamber (2), wherein the upper oil chamber (1) and the lower oil chamber (2) are connected to each other through the manual hydraulic drive mechanism; The bearing seat (6) is arranged laterally. The closed end of the bearing seat (6) is connected and fixed to the lower side wall of the hydraulic telescopic cylinder (3). The oil hole (11) passes through the side wall of the hydraulic telescopic cylinder (3) and communicates with the lower oil chamber (2). A hydraulic pipe (8) is connected between the upper oil chamber (1) and the vertical hole section (12). The open end of the inner shaft (10) is connected to the lower oil chamber (2). The vertical hole section (12) is connected to the lower oil chamber (2) through the inner hole (24).

10. A bidirectional manual hydraulic lifting device according to claim 9, characterized in that, The hydraulic telescopic cylinder (3) includes a cylinder body (31) and a rod piston (32). The cylinder body (31) is a hollow cylinder with an inner circle and an outer square shape and closed ends. The closed end of the bearing seat (6) is connected to the flange on the lower side wall of the cylinder body (31). The bottom of the cylinder body (31) is equipped with a flange plate (5). The rod piston (32) is slidably mounted on the cylinder body (31). The two ends of the rod piston (32) are respectively arranged inside and outside the cylinder body (31). The rod piston (32) divides the inner cavity of the cylinder body (31) into an upper oil chamber (1) and a lower oil chamber (2). The oil hole (11) passes through the side wall of the cylinder body (31) and communicates with the lower oil chamber (2). The side wall of the hydraulic telescopic cylinder (3) is provided with a central hole (23), and the opening end of the inner shaft (10) is connected to the lower oil chamber (2) through the central hole (23).

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