Bidirectional-operation manual hydraulic driving mechanism and hydraulic lifting device

Abstract

The invention relates to a bidirectional operation manual hydraulic driving mechanism and a hydraulic lifting device, the bidirectional operation manual hydraulic driving mechanism comprises a hydraulic telescopic oil cylinder with an upper oil cavity and a lower oil cavity and a manual hydraulic driving mechanism, the manual hydraulic driving mechanism comprises a shaft seat, a shaft cover, an inclined supporting disc arranged in the shaft seat, a hydraulic pipe, an eccentric shaft and a hollow inner shaft; one end of the shaft seat is provided with an oil hole I communicated with the lower oil cavity, a vertical hole section and a transverse hole section which are communicated with each other, and the hydraulic pipe is communicated with the upper oil cavity and the vertical hole section; an inclined pressing face is arranged on the inclined supporting disc, an eccentric shaft rotates anticlockwise in the shaft seat, a plurality of transmission holes are formed in one end of the eccentric shaft, and a transverse hole section is discontinuously communicated with the first oil hole through the transmission holes. An oil pressing rod with one end abutting against the pressing face is elastically connected into the transmission hole in a sliding mode. An inner shaft is rotationally connected in the eccentric shaft through a torsion spring, and the inner vertical hole section is communicated with the lower oil cavity through the inner shaft. The hydraulic telescopic oil cylinder can be conveniently controlled to move up and down through manual forward and reverse rotation operation, and the hydraulic telescopic oil cylinder needs to be driven by external force in a matched mode when moving downwards.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic drive, and in particular to a manually operated hydraulic drive mechanism with two-way operation and a hydraulic lifting device. Background Art

[0002] There are various medical rehabilitation devices on the market. In some rehabilitation devices, in order to achieve functions such as support, height adjustment, and angle adjustment, electric push rods are used for two-way movement or gas springs are used for assistance in the devices. Both electric push rods and gas springs belong to telescopic members and can play the roles of support, height adjustment, and angle adjustment.

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

[0004] Currently, when installing an electric push rod, additional wires need to be configured, so the connection and installation of the electric push rod are complex. The electric push rod is driven by electricity and cannot operate once power is cut off. When operating a gas spring, an operating wrench needs to be configured. Press the operating wrench to drive the pull wire, and the pull wire drives the thimble of the gas spring to open and close, thereby controlling the stroke of the gas spring and realizing the expansion and contraction of the gas spring. Therefore, the operation is cumbersome and inconvenient.

[0005] Similarly, if a hydraulic cylinder is used as a telescopic member in a rehabilitation device to achieve corresponding functions, relevant auxiliary facilities such as an oil pump, oil pipes, and a reversing valve need to be equipped, which occupies a large space, the pipeline layout is complicated, and the number of pipeline joints is large, so the risk of hydraulic oil leakage is high. Summary of the Invention

[0006] In order to solve the problems that the connection and installation of a hydraulic telescopic member are complex and a series of supporting facilities are required to realize operation, the present invention provides a manually operated hydraulic drive mechanism with two-way operation and a hydraulic lifting device. On the basis of a hydraulic cylinder, it is optimized into a manually operated structure. Through manual forward and reverse rotation operations, it is convenient and fast, and can realize forward and reverse two-way rotational motion, thereby controlling the descent and ascent of the hydraulic cylinder, so as to enable the hydraulic cylinder to have a telescopic function. It should be noted that external force cooperation is required for downward movement; no external pipelines, oil pumps and other auxiliary facilities are required, and the installation is convenient and fast; the overall structure design is simple and the operation is convenient.

[0007] To achieve the above object, the technical solution adopted by the present invention is: A manually operated hydraulic drive mechanism with two-way operation, comprising a shaft seat, a shaft cover, an inclined support disk, an eccentric shaft, and a hollow inner shaft with one end open and the other end closed; The shaft seat is in the shape of a cylinder with one end closed and the other end open, which is convenient for installing components. An oil hole 1 is axially provided at the closed end of the shaft seat, and an oil hole 2 is radially provided at the closed end of the shaft seat. The oil hole 2 includes a vertical hole section and a horizontal hole section that are vertically connected. The shaft cover is detachably arranged at the open end of the shaft seat, which is convenient for closing the shaft seat; The inclined support disk is arranged inside the shaft seat. One end face of the inclined support disk is inclined to form a pressing surface, and the pressing surface faces the closed end of the shaft seat. The eccentric shaft is rotatably arranged counterclockwise inside the shaft seat, which limits the rotation direction of the eccentric shaft. The eccentric shaft passes between the inclined support disk and the shaft seat, and both ends of the eccentric shaft respectively abut against the closed end of the shaft seat and the shaft cover; A plurality of transmission holes are evenly arranged in the circumferential direction at one end of the eccentric shaft close to the closed end of the shaft seat. The horizontal hole section is intermittently communicated with the oil hole 1 through the transmission holes in the rotating state, constituting a flow channel for the oil fluid; An oil pressing rod is elastically slidably connected in each transmission hole, and one end of the oil pressing rod extends out of the transmission hole and tightly abuts against the pressing surface. Under the action of the pressing surface, the oil pressing rod can be urged to axially reciprocate in the transmission hole; The inner shaft is rotatably connected to the eccentric shaft through a torsion spring inside the eccentric shaft. The inner shaft is arranged at the center of the shaft seat, and the open end passes through the eccentric shaft and extends outside the closed end of the shaft seat. An inner hole is provided on the side wall of the open end of the inner shaft, and the vertical hole section corresponds to the inner hole up and down; The closed end of the inner shaft passes through the eccentric shaft and extends outside the shaft cover, and the inner shaft rotates counterclockwise to drive the eccentric shaft to rotate.

[0008] Further, the open end of the shaft seat is flange bolted to the shaft cover, which is convenient for disassembling and assembling the shaft cover, and the shaft cover closes the opening of the shaft seat; The oil hole 1 is eccentrically arranged on the closed end of the shaft seat. After axially penetrating the closed end of the shaft seat, the oil hole 1 communicates with the inside and outside of the shaft seat.

[0009] Further, both the vertical hole section and the horizontal hole section are arranged inside the closed end of the shaft seat. The cross section is in a cross shape after the vertical hole section and the horizontal hole section are connected. The vertical hole section is arranged radially along the shaft seat, and the horizontal hole section is arranged axially along the shaft seat. The upper end of the vertical hole section extends out of the shaft seat, and the lower end extends to the center of the shaft seat.

[0010] Further, the eccentric shaft is a stepped hollow circular shaft body with large ends and a small middle. A plurality of transmission holes are evenly arranged along the circumferential direction of the eccentric shaft. After the eccentric shaft rotates, the plurality of transmission holes and the horizontal hole section are sequentially connected, and the plurality of transmission holes and the oil hole 1 are sequentially connected; The transmission hole is a through hole, which penetrates one end of the eccentric shaft. The transmission hole includes a triangular hole and a cylindrical hole that are connected to each other. The triangular hole is arranged on one end face of the eccentric shaft, the triangular hole is close to the horizontal hole section, and the cylindrical hole is arranged in the middle of the triangular hole. The cylindrical hole, the triangular hole and the horizontal hole section are sequentially connected.

[0011] Furthermore, the inclined support plate is bolted inside the shaft seat to facilitate the disassembly and assembly of the inclined support plate. The inclined support plate is a disc body with an "I"-shaped cross section. The middle part of the inclined support plate is sleeved on the outside 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. The oil pressure rod is slidably arranged in the cylindrical hole, and the oil pressure rod includes an integrally formed cylindrical section, a limit plate section and a round head section. The cylindrical section, the limit plate section and the round head section are connected in sequence. The cylindrical section is placed in the cylindrical hole and slides. The diameter of the cylindrical section is consistent with the inner diameter of the cylindrical hole. One end of the cylindrical section extends out of the cylindrical hole and is connected with the limit plate section. The size of the limit plate section is larger than that of the cylindrical section. A compression spring is arranged on the outer sleeve of the cylindrical section between the limit plate section and the end face of the cylindrical hole. The compression spring prompts the oil pressure rod to extend out of the transfer hole, and the round head section is tightly against the clamping surface.

[0012] Furthermore, a large bearing is arranged between the shaft cover and the eccentric shaft to facilitate the rotation of the eccentric shaft. A ratchet is arranged at the other end of the eccentric shaft. A pawl is arranged on the edge of the inclined support plate through the rotation of the torsion spring. The pawl abuts against the ratchet to limit the clockwise rotation of the eccentric shaft.

[0013] Furthermore, the inner shaft is sequentially inserted between the shaft cover, the eccentric shaft and the center of the shaft seat, and the closed end of the inner shaft passes through the shaft cover and is connected to a wrench, which is convenient for operating the inner shaft to rotate it. A small bearing is arranged between the inner shaft and the eccentric shaft to facilitate the rotation of the inner shaft, and the inner shaft rotates counterclockwise or clockwise. The inner hole is connected to the interior of the inner shaft, and the inner shaft rotates clockwise to drive the inner hole to communicate with the vertical hole section.

[0014] Furthermore, a rotating block is provided on the inner shaft, the rotating block protrudes from the side wall of the inner shaft, a rotating groove bent in a semicircular shape is opened inside the eccentric shaft, the torsion spring is sleeved on the inner shaft, one end of the torsion spring abuts against the rotating groove and the other end abuts against the rotating block, and the rotating block abuts against one end of the rotating groove.

[0015] A manual hydraulic lifting device with bidirectional operation, comprising the above-mentioned manual hydraulic driving mechanism, and also comprising a hydraulic telescopic oil cylinder with an upper oil chamber and a lower oil chamber, wherein the upper oil chamber and the lower oil chamber are connected through the manual hydraulic driving mechanism, so that the oil amount in the upper oil chamber and the lower oil chamber can be conveniently controlled through the manual hydraulic driving mechanism; The axle seat is arranged horizontally, and the closed end of the axle seat is connected and fixed to the lower side wall of the hydraulic telescopic cylinder. An oil hole passes through the side wall of the hydraulic telescopic cylinder and is connected to the lower oil chamber. A hydraulic pipe is connected between the upper oil chamber and the vertical hole section to facilitate the oil to enter 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.

[0016] Furthermore, the hydraulic telescopic cylinder includes a cylinder block and a piston rod. The cylinder block is a hollow cylinder with a round inner surface and a square outer surface, and both ends are closed. The shaft seat is flange-connected to the closed end and the lower side wall flange of the cylinder block, which facilitates the disassembly and assembly of the shaft seat. The bottom of the cylinder block is provided with a flange plate, which is convenient for installing the hydraulic telescopic cylinder on the corresponding carrier. The piston rod slides up and down on the cylinder block, and both ends of the piston rod are arranged inside and outside the cylinder block respectively. The piston rod divides the inner cavity of the cylinder block into an upper oil cavity and a lower oil cavity. The first oil hole passes through the side wall of the cylinder block and communicates with the lower oil cavity. A central hole is opened on the side wall of the hydraulic telescopic cylinder, and the open end of the inner shaft communicates with the lower oil cavity through the central hole.

[0017] By the above technical solution, the beneficial effects of the present invention are as follows: The structure of the present invention is designed simply and is convenient to operate. Manually rotate the inner shaft clockwise, and the vertical hole section is communicated with the lower oil cavity through the inner hole, and then the upper oil cavity and the lower oil cavity are communicated up and down. At this time, external force cooperation is required to drive downward, that is, through the load weight on the hydraulic telescopic cylinder, the piston rod is driven to move downward, which facilitates the retraction of the hydraulic telescopic cylinder.

[0018] Manually rotate the inner shaft counterclockwise in the present invention to drive the eccentric shaft to rotate together, and multiple oil pressing rods on the eccentric shaft rotate accordingly. During the rotation of the eccentric shaft, the oil in the upper oil cavity enters the transfer hole. The oil pressing rods are gradually pressed into the transfer hole by the pressing surface to pressurize the oil until the transfer hole is communicated with the lower oil cavity, and the oil with a certain pressure enters the lower oil cavity to push the piston rod upward. At the same time, the oil in the upper oil cavity enters the empty transfer hole again, and the locking of each oil pressing is realized through the ratchet and pawl structure. Repeating this process can realize the extension action of the hydraulic telescopic cylinder.

[0019] The present invention has its own power and pipelines, does not require additional configuration of wires and power sources, is convenient to install, and is not affected by power outages, and can work at any time. By manually rotating the inner shaft clockwise or counterclockwise, the descent or ascent of the hydraulic telescopic cylinder can be controlled. Furthermore, the hydraulic lifting structure is simple, and manual operation and control are convenient and fast, with a good scope of application, and is suitable for the field of rehabilitation medical devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is an isometric view of a two-way operation manual hydraulic drive mechanism of the present invention.

[0021] Figure 2 is a cross-sectional view of a two-way operation manual hydraulic drive mechanism of the present invention.

[0022] Figure 3 is a two-way operation manual hydraulic drive mechanism of the present invention Figure 2 partial enlarged schematic view.

[0023] Figure 4 It is a schematic diagram of the separation of the shaft seat and the shaft cover of a two-way operating manual hydraulic drive mechanism of the present invention.

[0024] Figure 5 It is a schematic diagram of the separation of the eccentric shaft and the shaft seat of a two-way operating manual hydraulic drive mechanism of the present invention.

[0025] Figure 6 It is a sectional view of the installation of the inclined support disk and the shaft seat of a two-way operating manual hydraulic drive mechanism of the present invention.

[0026] Figure 7 It is a Figure 4 Schematic diagram of the cooperation between the ratchet and the pawl in the A-A direction of a two-way operating manual hydraulic drive mechanism of the present invention.

[0027] Figure 8 It is one of the axonometric views of the installation of the inclined support disk and the eccentric shaft of a two-way operating manual hydraulic drive mechanism of the present invention.

[0028] Figure 9 It is the second axonometric view of the installation of the inclined support disk and the eccentric shaft of a two-way operating manual hydraulic drive mechanism of the present invention.

[0029] Figure 10 It is the axonometric view of the separation of the inclined support disk and the eccentric shaft of a two-way operating manual hydraulic drive mechanism of the present invention.

[0030] Figure 11 It is a Figure 10 Sectional view of a two-way operating manual hydraulic drive mechanism of the present invention.

[0031] Figure 12 It is the axonometric view of a two-way operating manual hydraulic lifting device of the present invention.

[0032] Figure 13 It is the sectional view of a two-way operating manual hydraulic lifting device of the present invention.

[0033] Figure 14 It is the sectional view of the installation of the shaft seat and the cylinder block of a two-way operating manual hydraulic lifting device of the present invention.

[0034] Figure 15 It is a Figure 14 Partial enlarged schematic diagram of a two-way operating manual hydraulic lifting device of the present invention.

[0035] The reference numerals in the drawings are: 1 upper oil chamber, 2 lower oil chamber, 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, 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 disc, 26 pressing surface, 27 oil pressing rod, 271 cylindrical section, 272 limiting disc section, 273 round head section, 28 compression spring. Detailed implementation manner

[0036] The following describes in detail the specific implementation manner of the present invention in conjunction with the drawings: As Figures 1 to 11 shown, a manually hydraulic drive mechanism with two-way operation includes a shaft seat 6, a shaft cover 7, an inclined support disc 25, an eccentric shaft 9, and a hollow inner shaft 10 with one end open and the other end closed.

[0037] The shaft seat 6 is in the shape of a cylinder with one end closed and the other end open. The inside 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, 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 with the inside and outside of the shaft seat 6.

[0038] 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.

[0039] 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 is flange bolted to the shaft cover 7, so that the shaft cover 7 can be connected and fixed to the shaft seat 6. The shaft cover 7 closes the opening of the shaft seat 6, that is, the opening position of the shaft seat 6 can be closed by using the shaft cover 7, so as to realize the closure of the internal space of the shaft seat 6.

[0040] There is an inclined support disk 25 arranged inside the shaft seat 6. The inclined support disk 25 is bolted inside the shaft seat 6 to achieve the installation and fixation of the inclined support disk 25, and the inclined support disk 25 abuts against the shoulder position on the inner wall of the shaft seat 6. The inclined support disk 25 is a disk body with a "H"-shaped cross-section. One end face of the inclined support disk 25 is arranged obliquely to form a pressing surface 26, that is, one end face in the middle of the inclined support disk 25 is the pressing surface 26. The pressing surface 26 is an annular surface, and the pressing surface 26 faces the closed end of the shaft seat 6.

[0041] An eccentric shaft 9 is rotatably arranged counterclockwise inside the shaft seat 6. Here, the rotation direction of the eccentric shaft 9 is specifically limited to the counterclockwise direction. The eccentric shaft 9 is a stepped hollow circular shaft body with large ends and a small middle. The eccentric shaft 9 passes through between the inclined support disk 25 and the shaft seat 6 and rotates between the two. The middle part of the inclined support disk 25 is sleeved on the outside of the middle part of the eccentric shaft 9. Both ends of the eccentric shaft 9 respectively abut against the closed end of the shaft seat 6 and the shaft cover 7 to limit the axial movement of the eccentric shaft 9. A large bearing 14 is arranged between the shaft cover 7 and the eccentric shaft 9 to improve the smooth rotation of the eccentric shaft 9.

[0042] When the eccentric shaft 9 rotates, it is restricted that the eccentric shaft 9 can only rotate counterclockwise and cannot rotate clockwise. The means to achieve the one-way rotation of the eccentric shaft 9 adopts a ratchet and pawl structure. Specifically: a ratchet 15 is arranged at the other end of the eccentric shaft 9, and the ratchet 15 is integrally formed with the eccentric shaft 9. At the same time, a pawl 16 is rotatably arranged at the edge of the inclined support disk 25 through a torsion spring. The installation of the pawl 16 is a prior art, and a torsion spring and a shaft are used in cooperation during installation. After the pawl 16 is installed, the pawl 16 tends to rotate counterclockwise under the action of the torsion spring, and then the pawl 16 abuts against the ratchet 15 to restrict the clockwise rotation of the eccentric shaft 9, so that the eccentric shaft 9 can only rotate counterclockwise.

[0043] A sealing ring is sleeved on 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 side wall of the closed end of the shaft seat 6. At the same time, a sealing ring is sleeved on the outer circumferential surface at 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 ring is not shown in the figure.

[0044] It should be noted that: since the inclined support disk 25 is sleeved on the outside of the eccentric shaft 9, in order to facilitate the installation of the inclined support disk 25, the eccentric shaft 9 can be designed as a split structure. Here, the eccentric shaft 9 is disconnected at the small-diameter section. The disconnection position can refer to Figure 3 、 4 、the dotted line position on the eccentric shaft 9 in 5. The position where the dotted line is located is the disconnection position of the eccentric shaft 9. After disconnection, the eccentric shaft 9 is composed of left and right parts. When the left and right parts are combined, protrusions and grooves are respectively arranged on the end faces that are combined with each other. Then, the split eccentric shaft 9 can be combined by inserting the protrusions and grooves, and the left and right parts of the eccentric shaft 9 can rotate together.

[0045] Six transmission holes 17 are circumferentially arranged at one end of the eccentric shaft 9 close to the closed end of the shaft seat 6, and the six transmission holes 17 are evenly arranged along the circumferential direction of the eccentric shaft 9. The transmission holes 17 are through holes, the transmission holes 17 penetrate through one end of the eccentric shaft 9, the transmission holes 17 include a triangular hole 171 and a cylindrical hole 172 which are communicated with each other, the triangular hole 171 is arranged on one end face of the eccentric shaft 9, the triangular hole 171 is close to the transverse hole section 13, the cylindrical hole 172 is arranged in the middle of the triangular hole 171, and the cylindrical hole 172, the triangular hole 171 and the transverse hole section 13 are sequentially communicated along the axial direction of the shaft seat 6.

[0046] The function of the transmission hole 17 is to connect the transverse hole section 13 and the first oil hole 11. Specifically, the transverse hole section 13 is intermittently connected with the first oil hole 11 through the transmission hole 17 in the rotating state, that is, after the eccentric shaft 9 rotates, the six transmission holes 17 and the transverse hole section 13 are sequentially connected, and the six transmission holes 17 and the first oil hole 11 are sequentially connected.

[0047] During the rotation of the eccentric shaft 9, the six transmission holes 17 rotate simultaneously. During the rotation of each transmission hole 17, it will first pass through the transverse hole section 13 and then pass through the first oil hole 11. When the transmission hole 17 corresponds to the transverse hole section 13, the two are connected; when the transmission hole 17 corresponds to the first oil hole 11, the two are connected. When any one of the transmission holes 17 is connected to the transverse hole section 13, another transmission hole 17 is connected to the first oil hole 11 at the same time. When the pawl 16 engages with the ratchet wheel 15, the eccentric shaft 9 does not rotate. At this time, the transmission hole 17 does not correspond to the first oil hole 11 and the transverse hole section 13, thereby disconnecting the flow channel of the hydraulic oil medium. Only during the rotation of the eccentric shaft 9 can the first oil hole 11 and the transverse hole section 13 be connected through the transmission hole 17.

[0048] An oil pressing rod 27 is elastically slidably connected in each transmission hole 17, and the oil pressing rod 27 can axially slide in the transmission hole 17. One end of the oil pressing rod 27 extends out of the transmission hole 17 and abuts against the pressing surface 26. Specifically, the oil pressing rod 27 is slidably arranged in the cylindrical hole 172, and the oil pressing rod 27 includes a cylindrical section 271, a limiting disk section 272 and a round head section 273 which are integrally formed, and the cylindrical section 271, the limiting disk section 272 and the round head section 273 are sequentially connected.

[0049] The cylindrical section 271 is placed in the cylindrical hole 172 and slides, 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 with the limiting disk section 272, and the round head section 273 at one end of the limiting disk section 272 abuts against the pressing surface 26.

[0050] To achieve the elastic sliding of the oil pressing rod 27, the size of the limit disk section 272 is larger than that of the cylindrical section 271. A compression spring 28 is sleeved outside the cylindrical section 271 between the end face of the limit disk section 272 and the cylindrical hole 172. In this way, during the rotation of the eccentric shaft 9, the oil pressing rod 27 is driven to rotate together. Under the action of the compression spring 28, the end of the oil pressing rod 27 tightly abuts against the pressing surface 26. Since the pressing surface 26 is an inclined surface, the pressing surface 26 presses and releases the oil pressing rod 27, realizing the reciprocating sliding of the oil pressing rod 27 in the transmission hole 17. When the oil pressing rod 27 extends to the maximum length outside the transmission hole 17, the oil pressing rod 27 corresponds to the transverse hole section 13. When the oil pressing rod 27 is about to retract to the maximum length into the transmission hole 17, the oil pressing rod 27 corresponds to the first oil hole 11.

[0051] To drive the eccentric shaft 9, an inner shaft 10 is rotatably connected to the eccentric shaft 9 through a torsion spring 22. The inner shaft 10 is arranged at the center of the shaft seat 6 and sequentially passes through the center between the shaft cover 7, the eccentric shaft 9 and the shaft seat 6. At the same time, to improve the smooth rotation of the inner shaft 10, a small bearing 18 is provided between the inner shaft 10 and the eccentric shaft 9.

[0052] 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 follow.

[0053] The means for the inner shaft 10 to control the rotation of the eccentric shaft 9 is as follows: a rectangular rotating block 20 is provided on the inner shaft 10, and the rotating block 20 protrudes from the side wall of the inner shaft 10. A rotating groove 21 bent into a semi-circular arc is formed inside the eccentric shaft 9. A 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 torsion spring 22 urges the rotating block 20 to abut against one end of the rotating groove 21, and the inner shaft 10 tends to rotate counterclockwise. In this way, when the inner shaft 10 rotates counterclockwise and abuts against one end of the rotating groove 21 through the rotating block 20, it can smoothly drive the eccentric shaft 9 to rotate. Only when the inner shaft 10 rotates clockwise does it need to overcome the acting force of the torsion spring 22. That is, if the inner shaft 10 rotates clockwise, it needs to overcome the acting force of the torsion spring 22, and the rotating block 20 is no longer blocked by the rotating groove 21, and the inner shaft 10 does not drive the eccentric shaft 9 to rotate.

[0054] The closed end of the inner shaft 10 passes through the eccentric shaft 9 and extends outside the shaft cover 7. The closed end of the inner shaft 10 is connected with a wrench 19 outside the shaft cover 7, which is convenient for operating the inner shaft 10 to rotate. The open end of the inner shaft 10 passes through the eccentric shaft 9 and extends outside the closed end of the shaft seat 6. An inner hole 24 is formed on the side wall of the open end of the inner shaft 10. The inner hole 24 is a tapered hole, and the inner hole 24 communicates with the inside of the inner shaft 10.

[0055] The vertical hole section 12 corresponds to the inner hole 24 vertically, but they are not connected in the initial state. The clockwise rotation of the inner shaft 10 drives the inner hole 24 and the vertical hole section 12 to be connected. That is, only when the inner shaft 10 rotates clockwise and overcomes the acting force of the torsion spring 22, the inner shaft 10 will deflect to drive the inner hole 24 to rotate and be connected to the vertical hole section 12. Once the control of the inner shaft 10 is stopped, the torsion spring 22 drives the inner shaft 10 to rotate counterclockwise, and the inner hole 24 and the vertical hole section 12 are no longer connected.

[0056] The application principle of the manual hydraulic driving mechanism is as follows: Connect the vertical hole section 12 to a hydraulic oil storage space A with pressure, and connect the open end of the inner shaft 10 and the first oil hole 11 to another hydraulic oil storage space B with pressure at the same time. The counterclockwise rotation of the eccentric shaft 9 is controlled by the inner shaft 10, and then each transfer hole 17 first passes through the horizontal hole section 13 and then through the first oil hole 11. After the eccentric shaft 9 rotates, the six transfer holes 17 and the horizontal hole section 13 are connected in sequence, and the six transfer holes 17 and the first oil hole 11 are connected in sequence, so that the hydraulic oil in the hydraulic oil storage space A can be manually pumped into the hydraulic oil storage space B.

[0057] At the same time, it can also be achieved that: rotating the inner shaft 10 clockwise causes the vertical hole section 12 to be connected to the hydraulic oil storage space B through the inner hole 24. In this way, the hydraulic oil in the hydraulic oil storage space A and the hydraulic oil storage space B can be conducted, and by driving and squeezing with an external force, the hydraulic oil in the hydraulic oil storage space B can be made to enter the hydraulic oil storage space A. If the hydraulic oil storage space A and the hydraulic oil storage space B are respectively two oil chambers inside the hydraulic cylinder, then the lifting operation of the hydraulic cylinder can be controlled by the manual hydraulic driving mechanism, and an external force drive is required during the descending operation.

[0058] As Figures 12 to 15 shown, a two-way operating manual hydraulic lifting device includes a manual hydraulic driving mechanism, and also includes 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 driving mechanism. The hydraulic telescopic cylinder 3 is similar in structure to a conventional hydraulic cylinder. Here, the hydraulic telescopic cylinder 3 includes a cylinder block 31 and a piston rod 32 with a rod. The piston rod 32 with a rod slides up and down on the cylinder block 31, and both ends of the piston rod 32 with a rod are arranged inside and outside the cylinder block 31 respectively.

[0059] Different from conventional hydraulic cylinders, the cylinder block 31 is a hollow cylinder with a round inner surface and a square outer surface, and both ends are closed. The bottom of the cylinder block 31 is provided with a flange plate 5 to facilitate the installation of the hydraulic telescopic cylinder 3. The piston with rod 32 divides the inner cavity of the cylinder block 31 into an upper oil cavity 1 and a lower oil cavity 2. The upper oil cavity 1 and the lower oil cavity 2 are connected through a manual hydraulic driving mechanism. The manual hydraulic driving mechanism adopts an artificial manual operation method, and controls the up and down movement of the piston with rod 32 through the manual hydraulic driving mechanism. Specifically, the manual hydraulic driving mechanism can control the amount of hydraulic oil in the upper oil cavity 1 and the lower oil cavity 2, so as to control the up and down movement of the piston with rod 32.

[0060] When the manual hydraulic driving mechanism is installed on the hydraulic telescopic cylinder 3, the shaft seat 6 is arranged horizontally, and thus the shaft seat 6 is perpendicular to the cylinder block 31. The closed end of the shaft seat 6 is connected and fixed to the lower side wall of the hydraulic telescopic cylinder 3. Specifically, the closed end of the shaft seat 6 is flange-connected to the lower side wall of the cylinder block 31, so as to realize the installation and fixation of the shaft seat 6 and the cylinder block 31. After installation, the upper part of the pressing surface 26 on the inner inclined support plate 25 in the shaft seat 6 is close to the cylinder block 31, and the lower part is far from the cylinder block 31.

[0061] The first oil hole 11 should be connected to the lower oil cavity 2. Specifically, the first oil hole 11 penetrates through the side wall of the hydraulic telescopic cylinder 3 and is connected to the lower oil cavity 2, that is, the first oil hole 11 passes through the side wall of the cylinder block 31 and is connected to the lower oil cavity 2. The way of extending the first oil hole 11 can be adopted, so that the first oil hole 11 protrudes out of the end face of the closed end of the shaft seat 6, and then the first oil hole 11 can pass through the cylinder block 31 and be inserted into the lower oil cavity 2 to be connected to it. It is also possible to drill a hole in the side wall of the cylinder block 31 to form a large oil hole 4, and the large oil hole 12 is correspondingly connected to the first oil hole 11, so as to conduct the first oil hole 11 and the lower oil cavity 2.

[0062] The open end of the inner shaft 10 is connected to the lower oil cavity 2. Specifically, a central hole 23 is opened on the side wall of the hydraulic telescopic cylinder 3, and the central hole 23 is correspondingly connected to the open end of the inner shaft 10. The open end of the inner shaft 10 is connected to the lower oil cavity 2 through the central hole 23. In this way, the vertical hole section 12 can be connected to the lower oil cavity 2 through the inner hole 24.

[0063] A hydraulic pipe 8 is connected between the upper oil cavity 1 and the vertical hole section 12. The hydraulic pipe 8 is a hard pipe, and the hydraulic pipe 8 is arranged vertically along the cylinder block 31; when the hydraulic pipe 8 is installed, the upper end of the hydraulic pipe 8 is connected to the upper oil cavity 1, and the lower end is connected to the vertical hole section 12, that is, the upper end of the hydraulic pipe 8 is bent and then passes through the side wall of the cylinder block 31 and is connected to the upper oil cavity 1, and the lower end of the hydraulic pipe 8 extends into the vertical hole section 12 to connect the vertical hole section 12 and the horizontal hole section 13.

[0064] Before the manual hydraulic lifting device is used: first, the upper oil chamber 1 and the lower oil chamber 2 are filled with hydraulic oil of 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 set on the piston with rod 32 to ensure that the piston with rod 32 can effectively isolate the upper oil chamber 1 and the lower oil chamber 2. The sealing ring is not shown in the figure.

[0065] In the initial state, the torsion spring 22 drives the inner shaft 10 to rotate counterclockwise, so that the inner hole 24 and the vertical hole section 12 are not connected, and the transfer hole 17 is not connected to the oil hole 11, so that the oil in the upper oil chamber 1 and the lower oil chamber 2 are not conductive, and the oil content in the upper oil chamber 1 and the lower oil chamber 2 is constant, so that the rod piston 32 of the hydraulic telescopic cylinder 3 remains fixed, which can stably support the load.

[0066] When the hydraulic telescopic cylinder 3 needs to move downward, the operating wrench 19 overcomes the resistance of the torsion spring 22 and drives the inner shaft 10 to rotate clockwise, so that the inner hole 24 is connected to the vertical hole section 12. Since the inner hole 24 is connected to the lower oil chamber 2, and the vertical hole section 12 is connected to the upper oil chamber 1, the upper oil chamber 1 is connected to the lower oil chamber 2. The weight of the load, that is, the external force is required to drive downward, specifically: the load provides a downward pressure on the piston with rod 32, causing the piston with rod 32 to descend, and then the oil in the lower oil chamber 2 flows into the upper oil chamber 1 through the center hole 23, the inner hole 24, the vertical hole section 12 and the hydraulic pipe 8, realizing the retraction of the hydraulic telescopic cylinder 3.

[0067] 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 transfer hole 17 on the eccentric shaft 9 is first connected with the horizontal hole section 13. At this time, the oil pressure rod 27 in the transfer hole 17 extends out of the transfer hole 17 to the maximum extent, and then the oil in the horizontal hole section 13 enters the transfer hole 17, and the oil in the upper oil chamber 1 is reduced. As the eccentric shaft 9 rotates, the transfer hole 17 moves downward in the circumferential direction. During this process, the oil pressure rod 27 is squeezed by the pressing surface 26 and gradually enters the transfer hole 17, causing the hydraulic oil pressure to increase until the transfer hole 17 is connected with the oil hole 11, and the pressure of the hydraulic oil is released, and then the oil in the transfer hole 17 flows to the lower oil chamber 2 through the oil hole 11. The increase in oil in the lower oil chamber 2 lifts the rod piston 32 upward. At this time, there is just an empty transfer hole 17 connected with the vertical hole section 12, and then the oil in the upper oil chamber 1 enters the empty transfer hole 17 through the oil pipe 8.

[0068] Since the number of transfer holes 17 is six, by continuously rotating the eccentric shaft 9, the hydraulic oil in the upper oil chamber 1 can be continuously pressed into the lower oil chamber 2. The oil in the lower oil chamber 2 increases, and then the rod piston 32 is lifted, realizing the extension of the hydraulic telescopic cylinder 3. Since the eccentric shaft 9 cannot rotate clockwise, the backflow of the hydraulic oil can be prevented. The present invention is well applicable to the telescopic motion structure in the field of rehabilitation medical devices, with a simple structure design and convenient operation.

[0069] The above embodiments are only the preferred embodiments of the present invention, and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features, and principles described in the scope of the present invention shall be included in the scope of the present invention's patent application.

Claims

1. A two-way manual hydraulic drive mechanism, characterized in that: It comprises a shaft seat (6), a shaft cover (7), an inclined support plate (25), an eccentric shaft (9), and a hollow inner shaft (10) with an opening at one end and a closed end at the other end; The shaft seat (6) is cylindrical with one end closed and the other end open. The closed end of the shaft seat (6) is provided with an oil hole 1 (11) axially, and the closed end of the shaft seat (6) is provided with an oil hole 2 radially. The oil hole 2 includes a vertical hole section (12) and a horizontal hole section (13) which are vertically connected. The open end of the shaft seat (6) is detachably provided with the shaft cover (7). The shaft seat (6) is provided with the inclined support disk (25), one end surface of the inclined support disk (25) is arranged to be inclined to form a pressing surface (26), the pressing surface (26) faces the closed end of the shaft seat (6), the eccentric shaft (9) is arranged in the shaft seat (6) to rotate counterclockwise, the eccentric shaft (9) is passed between the inclined support disk (25) and the shaft seat (6), and the two ends of the eccentric shaft (9) are respectively against the closed end of the shaft seat (6) and the shaft cover (7); A plurality of transfer holes (17) are provided in a circumferential direction at one end of the eccentric shaft (9) close to the closed end of the shaft seat (6); the transverse hole section (13) is intermittently connected with the oil hole 1 (11) through the transfer hole (17) in a rotating state; an oil pressure rod (27) is elastically slidably connected in each of the transfer holes (17); one end of the oil pressure rod (27) extends out of the transfer hole (17) and is tightly pressed against the pressing surface (26); The eccentric shaft (9) is rotatably connected to the inner shaft (10) via a torsion spring (22). The inner shaft (10) is arranged at the center of the shaft seat (6). The open end passes through the eccentric shaft (9) and extends to the outside of the closed end of the shaft seat (6). An inner hole (24) is formed on the side wall of the open end of the inner shaft (10). The vertical hole section (12) corresponds to the inner hole (24) in upper and lower directions. The closed end of the inner shaft (10) passes through the eccentric shaft (9) and extends to the outside of the shaft cover (7). The inner shaft (10) rotates counterclockwise to drive the eccentric shaft (9) to rotate.

2. A two-way manual hydraulic drive mechanism according to claim 1, characterized in that: The open end of the shaft seat (6) is connected to the flange of the shaft cover (7) by bolts, and the shaft cover (7) closes the opening of the shaft seat (6); the oil hole (11) is eccentrically arranged on the closed end of the shaft seat (6), and the oil hole (11) axially penetrates the closed end of the shaft seat (6) and communicates with the inside and outside of the shaft seat (6).

3. A two-way manual hydraulic drive mechanism according to claim 1, characterized in that: The vertical hole section (12) and the transverse hole section (13) are both arranged in the closed end of the shaft seat (6); the vertical hole section (12) and the transverse hole section (13) are connected to each other and have a cross-shaped cross section; the vertical hole section (12) is arranged radially of the shaft seat (6), and the transverse hole section (13) is arranged axially of 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).

4. A two-way manual hydraulic drive mechanism according to claim 1, characterized in that: The eccentric shaft (9) is a stepped hollow circular shaft body with large ends and a small middle. The plurality of transfer holes (17) are evenly arranged along the circumference of the eccentric shaft (9). After the eccentric shaft (9) rotates, the plurality of transfer holes (17) and the transverse hole section (13) are connected in sequence, and the plurality of transfer holes (17) and the oil hole 1 (11) are connected in sequence. The transfer hole (17) is a through hole, and the transfer hole (17) passes through one end of the eccentric shaft (9). The transfer hole (17) comprises a triangular hole (171) and a cylindrical hole (172) that are connected to each other. The triangular hole (171) is arranged on one end surface of the eccentric shaft (9), the triangular hole (171) is close to the transverse hole section (13), the cylindrical hole (172) is arranged in the middle of the triangular hole (171), and the cylindrical hole (172), the triangular hole (171) and the transverse hole section (13) are connected in sequence.

5. A two-way manual hydraulic drive mechanism according to claim 4, characterized in that: The inclined support plate (25) is bolted to the inside of the shaft seat (6); the inclined support plate (25) is a disc body with an "I"-shaped cross section; the middle portion of the inclined support plate (25) is sleeved on the outside of the middle portion of the eccentric shaft (9); and one end surface of the middle portion of the inclined support plate (25) is a pressing surface (26); The oil pressure rod (27) is slidably arranged in the cylindrical hole (172). The oil pressure rod (27) comprises an integrally formed cylindrical section (271), a limiting disk section (272) and a round head section (273). The cylindrical section (271), the limiting disk section (272) and the round head section (273) are connected in sequence. The cylindrical section (271) is placed in the cylindrical hole (172) to slide. The diameter of the cylindrical section (271) is consistent with 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 disk section (272). The size of the limiting disk section (272) is larger than that of the cylindrical section (271). A compression spring (28) is provided on the outer sleeve of the cylindrical section (271) between the limiting disk section (272) and the end surface of the cylindrical hole (172). The round head section (273) is tightly pressed against the pressing surface (26).

6. A two-way 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 at the edge of the inclined support plate (25) for rotation via a torsion spring; the pawl (16) abuts against the ratchet (15) to limit the clockwise rotation of the eccentric shaft (9).

7. A two-way manual hydraulic drive mechanism according to claim 1, characterized in that: The inner shaft (10) is sequentially inserted between the shaft cover (7), the eccentric shaft (9) and the center of 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 arranged 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 interior of the inner shaft (10), and the inner shaft (10) rotates clockwise to drive the inner hole (24) and the vertical hole section (12) to communicate.

8. A two-way 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) protruding from the side wall of the inner shaft (10), a rotating groove (21) bent into a semicircular arc shape is provided inside the eccentric shaft (9), 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), and the rotating block (20) abuts against one end of the rotating groove (21).

9. A two-way manual hydraulic lifting device, characterized in that: The manual hydraulic drive mechanism comprises the manual hydraulic drive mechanism according to any one of claims 1 to 8, and further comprises a hydraulic telescopic oil cylinder (3) having 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 via the manual hydraulic drive mechanism; The shaft seat (6) is arranged transversely, the closed end of the shaft 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 is connected to 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), and the vertical hole section (12) is connected to the lower oil chamber (2) through the inner hole (24).

10. A two-way manual hydraulic lifting device according to claim 9, characterized in that: The hydraulic telescopic oil cylinder (3) comprises a cylinder body (31) and a piston with a rod (32). The cylinder body (31) is a hollow cylinder with a round inner side and a square outer side and closed at both ends. The closed end of the shaft seat (6) is flange-connected to the lower side wall of the cylinder body (31). The bottom of the cylinder body (31) is provided with a flange plate (5). The piston with a rod (32) is slidably arranged on the cylinder body (31) up and down. The two ends of the piston with a rod (32) are respectively arranged inside and outside the cylinder body (31). The piston with a rod (32) divides the inner cavity of the cylinder body (31) into an upper oil cavity (1) and a lower oil cavity (2). The oil hole 1 (11) passes through the side wall of the cylinder body (31) and is connected to the lower oil chamber (2). A center hole (23) is provided on the side wall of the hydraulic telescopic oil cylinder (3), and the open end of the inner shaft (10) is connected to the lower oil chamber (2) through the center hole (23).

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