Self-locking hydraulic driving device

Abstract

The invention discloses a self-locking type hydraulic driving device which comprises a hydraulic oil cylinder, a hydraulic oil cylinder, a hydraulic oil cylinder, a hydraulic oil cylinder and a hydraulic oil cylinder, and is characterized in that the hydraulic oil cylinder is provided with an oil inlet and an oil outlet; the threaded sleeve is in threaded connection to the outer side of a piston rod of the hydraulic oil cylinder, an outer tooth part is installed at the top of the threaded sleeve, and an annular groove is formed in the bottom of the threaded sleeve; a driving motor is installed on the side portion of the fixing base, a gear body is installed at the end portion of the driving motor, the gear body is meshed with the outer tooth portion, the width of the gear body is 3-5 times that of the outer tooth portion, and a rolling body is installed at the top of the fixing base and corresponds to the annular groove in position. The hydraulic driving device solves the problem that when an existing hydraulic driving device is used for supporting a heavy object, once a hydraulic system fails, the limiting effect of a piston rod is lacked, and then safety accidents occur.

Description

Technical Field

[0001] The present invention belongs to the field of hydraulic jacks, and specifically relates to a self-locking hydraulic drive device, which can prevent the piston rod from falling once the hydraulic system fails, thereby solving the occurrence of safety accidents. Background Art

[0002] Existing hydraulic jack devices have problems of safety failure when jacking heavy objects, lacking an effective structure to restrict the piston rod. Therefore, once the hydraulic system fails during jacking, it will cause the movement of the piston rod, resulting in the loss of the jacking effect and ultimately causing safety accidents. Summary of the Invention

[0003] The technical problem to be solved by the present invention is:

[0004] How to solve the problem that when the existing hydraulic drive device jacks a heavy object, once the hydraulic system fails, there is a lack of restriction on the piston rod, resulting in safety accidents.

[0005] To solve the above technical problem, the inventor obtained the technical solution of the present invention through practice and summary. The present invention adopts the following technical solution:

[0006] A self-locking hydraulic drive device, comprising:

[0007] A hydraulic cylinder, which is provided with an oil inlet and an oil outlet.

[0008] A threaded sleeve, which is threadedly connected to the outside of the piston rod of the hydraulic cylinder. An external tooth portion is installed at the top of the threaded sleeve, and an annular groove is provided at the bottom of the threaded sleeve.

[0009] A fixed seat, on the side of which a driving motor is installed. A gear body is installed at the end of the driving motor. The gear body meshes with the external tooth portion, and the width of the gear body is 3-5 times the width of the external tooth portion. A rolling body is installed at the top of the fixed seat, and the rolling body corresponds to the position of the annular groove.

[0010] In a preferred embodiment, the gear body includes a central body, two side tooth portions provided at the top and bottom of the central body, and a lubricating portion located between the two side tooth portions. The lubricating portion includes an oil-absorbing cotton disposed in the central body and having one end exposed in the central body. An oil storage chamber is provided in the central body, and lubricating oil is stored in the oil storage chamber. A sealing cover is installed at the top of the oil storage chamber. The oil-absorbing cotton is used to wet the surface of the external tooth portion with the lubricating oil.

[0011] In a preferred embodiment, a jacking member is installed at the end of the piston rod of the hydraulic cylinder. The bottom of the jacking member is a ball head structure. A spherical groove is installed at the top of the piston rod. A limiting disc is installed at the end of the piston rod, and the limiting disc is sleeved outside the ball head structure and used to limit the ball head structure in the spherical groove.

[0012] Preferably, the device further includes a fixing plate independently arranged outside the lifting member. An electric telescopic rod is installed at the bottom of the fixing plate, and a guide sleeve is installed at the end of the electric telescopic rod. The guide sleeve is axially fitted to the bottom of the lifting member or the outside of the piston rod.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] In the present invention, the extension and retraction of the piston rod are realized by using the oil inlet and outlet of the hydraulic cylinder. When extending, the length of each extension is within the width range of the gear body, so that the external tooth part and the gear body are always in a meshed state. When moving to a predetermined position (the gear body and the external tooth part are still in a meshed state), the driving motor drives the gear body to rotate. The rotation of the gear body drives the external tooth part to rotate, and then the threaded sleeve is lowered to fit the annular groove and the rolling body. By using the adaptation of the rolling body and the annular groove, the contact friction between the threaded sleeve and the top of the fixed seat can be reduced, and the problem of overload of the driving motor at the end position can be avoided. How to judge whether the threaded sleeve has descended to the lowest point can be judged by installing a position sensor or a distance measurement sensor on the fixed seat. When the piston rod needs to be retracted, the driving motor drives the gear body to rotate in the reverse direction, and the threaded sleeve is moved along the piston rod to the side away from the hydraulic cylinder, and it is ensured that the external tooth part and the gear body do not separate at the end position each time. The piston rod is retracted through multiple such actions.

[0015] The present invention also improves the gear body to solve the problem of serious tooth wear caused by excessive frictional force during the axial movement of the external tooth part and the gear body. The lubricating part in the middle of the gear body can lubricate during the axial movement of the external tooth part relative to the gear body, reduce the wear degree of the tooth surface, and improve the durability and stability of the device.

[0016] A lifting body with a ball head structure is installed at the end of the piston rod of the present invention. The lifting body can be used to support the positions and angles of different objects. However, when vertical jacking cannot be effectively ensured, a fixing plate is independently arranged outside the lifting member. The electric telescopic rod on the fixing plate is used to realize that the guide sleeve is sleeved on the outside of the lifting member and the piston rod, so as to ensure the axial coaxiality of the lifting member and the piston rod, and further ensure axial jacking. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 is Figure 1 the sectional view of the gear body in DETAILED DESCRIPTION OF THE INVENTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0020] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0021] Embodiment 1

[0022] As Figure 1 shown, a self-locking hydraulic drive device includes:

[0023] A hydraulic cylinder 2, on which an oil inlet and an oil outlet are provided.

[0024] A threaded sleeve 7, which is threadedly connected to the outside of the piston rod 21 of the hydraulic cylinder 2. An external tooth portion 71 is installed at the top of the threaded sleeve 7, and an annular groove is provided at the bottom of the threaded sleeve 7.

[0025] A fixed seat 3, on the side of which a drive motor 31 is installed. A gear body 32 is installed at the end of the drive motor 31. The gear body 32 meshes with the external tooth portion 71, and the width of the gear body 32 is 3 - 5 times the width of the external tooth portion 71. A rolling body is installed at the top of the fixed seat 3, and the rolling body corresponds to the annular groove in position. A distance measuring sensor is installed at the top of the fixed seat 3 for measuring the distance from the external tooth portion 71 and feeding it back to the system to determine whether the threaded sleeve 7 is in place. Wherein the fixed seat 3 can be fixed on the top of the hydraulic cylinder 2 and axially slidably sleeved on the outside of the piston rod 21.

[0026] In use, the top of the piston rod 21 is used to support an object. When lifting the object, oil is supplied to the rodless cavity, and the piston rod 21 moves upward. The threaded sleeve 7 and the piston rod 21 move upward together. Each upward movement height will not cause the separation of the external tooth portion 71 and the gear body 32. When it moves upward to a certain height, the driving motor 31 drives the gear body 32 to rotate, and the external tooth portion 71 rotates, causing the threaded sleeve 7 to move closer to the hydraulic cylinder 2 side relative to the piston rod 21 until the annular groove and the rolling body are in corresponding and matching positions. The ranging sensor measures the end position signal, and the piston rod 21 moves upward again. Repeat the above actions until the support height is reached. When retracting the piston rod 21, first, the driving motor 31 rotates in the reverse direction to drive the gear body 32 to rotate, moving the threaded sleeve 7 to the side away from the hydraulic cylinder 2. Each moving distance of the threaded sleeve 21 away from the hydraulic cylinder 2 will not cause the separation of the external tooth portion 71 and the gear body 32. When it moves upward to a certain height, oil is supplied to the rod cavity, and the piston rod 21 falls back until the annular groove and the rolling body are in corresponding and matching positions. The ranging sensor measures the end position signal, and the threaded sleeve 7 moves upward again. Repeat the above actions until the piston rod 21 falls back to the initial position again.

[0027] Embodiment 2

[0028] In the above Embodiment 1, as Figure 2 shown, the gear body 32 includes a central body, two side tooth portions 501 provided at the top and bottom of the central body, and a lubricating portion located between the two side tooth portions 501. The lubricating portion includes an oil-absorbing cotton 52 provided in the central body and having one end exposed in the central body. An oil storage chamber 51 is provided in the central body, which is of an annular structure. Lubricating oil is stored in the oil storage chamber 51. A sealing cover 53 is installed at the top of the oil storage chamber 51. The oil-absorbing cotton 52 is used to wet the surface of the external tooth portion 71 with the lubricating oil. By storing lubricating oil in the oil storage chamber 51 and providing the oil-absorbing cotton 52 in the lubricating portion, the tooth surfaces of the oil storage chamber 51 and the external tooth portion 71 axially passing through the lubricating portion can be smeared with lubricating oil, and the use of lubricating oil can reduce the wear degree of the tooth surfaces.

[0029] Embodiment 3

[0030] In the above Embodiment 1, as Figure 1 shown, a lifting member 1 is installed at the end of the piston rod 21 of the hydraulic cylinder 2. The bottom of the lifting member 1 is of a ball head structure 11. A spherical groove is installed at the top of the piston rod 21. A limiting disk 22 is installed at the end of the piston rod 21. The limiting disk 22 is sleeved outside the ball head structure 11 and is used to limit the ball head structure 11 in the spherical groove. The use of the ball head structure 11 can enhance the angle adaptability of the lifting member 1, such as supporting objects at different angular positions.

[0031] Embodiment 4

[0032] In the above Embodiment 3, as Figure 1As shown, the device further includes a fixing plate 6 independently arranged outside the lifting member 1. An electric telescopic rod 61 is installed at the bottom of the fixing plate 6, and a guide sleeve 62 is installed at the end of the electric telescopic rod 61. The guide sleeve 62 is axially fitted to the bottom of the lifting member 1 or the outside of the piston rod 21. When performing axial jacking, since the embodiment 3 cannot achieve precise axial jacking, the electric telescopic rod 61 can axially sleeve the bottom of the lifting member 1 and the outside of the piston rod 21 to maintain coaxiality, thereby ensuring the axial jacking operation.

[0033] As described above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The substitution may be the substitution of some structures, devices, and method steps, or a complete technical solution. Any equivalent substitution or change made according to the technical solution of the present invention and its inventive concept should be covered within the protection scope of the present invention.

Claims

1. A self-locking hydraulic drive device, characterized in that Comprising: A hydraulic cylinder (2) having an oil inlet and an oil outlet provided thereon; A threaded sleeve (7) threadedly connected to the outside of the piston rod (21) of the hydraulic cylinder (2). An external tooth portion (71) is installed at the top of the threaded sleeve (7), and an annular groove is provided at the bottom of the threaded sleeve (7); A fixed seat (3) with a drive motor (31) installed on the side thereof. A gear body (32) is installed at the end of the drive motor (31). The gear body (32) meshes with the external tooth portion (71), and the width of the gear body (32) is 3 - 5 times the width of the external tooth portion (71). A rolling body is installed at the top of the fixed seat (3), and the rolling body corresponds to the position of the annular groove.

2. The self-locking hydraulic drive device according to claim 1, characterized in that, The gear body (32) includes a central body, two side tooth portions (501) provided at the top and bottom of the central body, and a lubricating portion located between the two side tooth portions (501). The lubricating portion includes an oil-absorbing cotton (52) provided in the central body and having one end exposed in the central body. An oil storage chamber (51) is provided in the central body, and lubricating oil is stored in the oil storage chamber (51). A sealing cover (53) is installed at the top of the oil storage chamber (51). The oil-absorbing cotton (52) is used to wet the surface of the external tooth portion (71) with the lubricating oil.

3. A self-locking hydraulic drive device according to claim 1, wherein The end of the piston rod (21) of the hydraulic cylinder (2) is installed with a jacking member (1). The bottom of the jacking member (1) is a ball head structure (11). A spherical groove is installed at the top of the piston rod (21). A limit disc (22) is installed at the end of the piston rod (21). The limit disc (22) is sleeved on the outside of the ball head structure (11) and is used to limit the ball head structure (11) within the spherical groove.

4. A self-locking hydraulic drive device according to claim 3, characterized in that, The device further includes a fixing plate (6) independently provided outside the jacking member (1). An electric telescopic rod (61) is installed at the bottom of the fixing plate (6). A guide sleeve (62) is installed at the end of the electric telescopic rod (61). The guide sleeve (62) is axially fitted to the bottom of the jacking member (1) or the outside of the piston rod (21).

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