Mechanically-locked heavy gear rack hydraulic device

Abstract

The utility model discloses a mechanical locking heavy gear rack hydraulic device which comprises a body, a rack pushing hydraulic cylinder and a gear shaft, the gear shaft longitudinally penetrates through the body, the rack pushing hydraulic cylinder transversely penetrates through the body and is provided with a rack piston, and the rack piston is meshed with the gear shaft in the body. The rack piston is movably located in the middle of the rack pushing hydraulic cylinder, the two ends of the rack piston and the two ends of the rack pushing hydraulic cylinder form an oil inlet cavity and an oil outlet cavity respectively, and at least one end of the rack pushing hydraulic cylinder is provided with a rack piston locking device. The rack piston locking device comprises a hydraulic motor and an external thread supporting cylinder, a spline shaft is arranged at the output end of the hydraulic motor and is in key connection with the inner side of the external thread supporting cylinder, a threaded hole is formed in the end of the rack piston, and the outer side of the external thread supporting cylinder is in threaded connection with the threaded hole. In the using process, the gear shaft can be stably stopped at a certain position for a long time and can be effectively locked, work is safe and reliable, and the occupied space is small.

Description

Technical Field

[0001] The utility model relates to the technical field of swing hydraulic cylinders, in particular to a mechanically locked heavy-duty gear rack hydraulic device. Background Art

[0002] In water conservancy, hydropower and municipal landscape projects, it is often necessary to set up openable dams. Some dams only need to be rotated without lifting. Therefore, a swing transmission device that can open and close heavy equipment is needed. It requires large starting torque, safety and reliability, and the ability to stably stop at a certain position for a long time and effectively lock. The traditional method often uses a long-stroke, large-bore hydraulic cylinder to promote the rotation of water conservancy gate valves and other equipment through a lever mechanism. Because the point of action is often located at the top of the equipment, it causes the disadvantages of long cylinder working stroke, large station area, low space utilization, large cylinder diameter and large hydraulic oil source volume.

[0003] In the prior art, for example, the rack and pinion swing hydraulic cylinder disclosed in CN 201170224Y has a large output torque, but is suitable for continuous rotation and tipping during use, and lacks the function of being able to stably stop at a certain position for a long time and being able to effectively lock. Utility Model Content

[0004] The utility model aims to provide a heavy-duty gear rack hydraulic device with mechanical locking, which can stably stop a gear shaft at a certain position for a long time and effectively lock it during use, has safe and reliable operation and occupies a small space.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A mechanically locked heavy-duty rack and gear hydraulic device comprises a body, a rack-pushing hydraulic cylinder and a gear shaft, wherein the gear shaft passes through the body longitudinally, the rack-pushing hydraulic cylinder passes through the body transversely and is provided with a rack piston, the rack piston meshes with the gear shaft in the body, an oil inlet and an oil outlet are respectively provided at two ends of the rack-pushing hydraulic cylinder, the rack piston is movably located in the middle of the rack-pushing hydraulic cylinder and the two ends of the rack piston respectively form an oil inlet chamber and an oil outlet chamber with the two ends of the rack-pushing hydraulic cylinder, at least one end of the rack-pushing hydraulic cylinder is provided with a rack piston locking device; the rack piston locking device comprises a hydraulic motor and an externally threaded support cylinder, the output end of the hydraulic motor is provided with a spline shaft, the other end of the spline shaft passes through the end of the rack-pushing hydraulic cylinder and extends into the rack-pushing hydraulic cylinder and is connected to the inner key of the externally threaded support cylinder, the end of the rack piston is provided with a threaded hole, and the outer side of the externally threaded support cylinder is threadedly connected to the threaded hole through a self-locking angle; the oil inlet and the oil outlet are respectively connected to the hydraulic device.

[0007] The invention relates to a rack piston locking device, which is added to the existing gear rack swing hydraulic cylinder, so that the swing hydraulic cylinder can be effectively locked in a specific position. The device occupies a compact space, has a smaller driving oil source tank volume, and more reasonable energy utilization. During operation, high-pressure hydraulic oil is injected into the oil inlet and oil inlet chamber of the rack-propelled hydraulic cylinder through the hydraulic pump station and pipeline, or high-pressure hydraulic oil is injected into the oil outlet and oil outlet chamber of the rack-propelled hydraulic cylinder. The hydraulic pressure acts on the end face of the rack piston to generate thrust on the rack piston, which drives the rack piston to reciprocate and drives the gear shaft meshing with the rack to rotate, thereby converting the thrust generated by the input hydraulic pressure into the gear shaft rotation motion and outputting torque. The size of the gear shaft rotation angle can be accurately controlled by the length of the rack piston movement distance stroke. The rack piston locking device of the invention includes a hydraulic motor, a spline shaft, an externally threaded support cylinder, etc. After the rack piston moves to the specified position, the oil inlet and outlet oil circuits are cut off (for example, the solenoid valve is used to switch the oil circuit). There is either a spatial distance between the end faces of the rack piston and the end face of the rack-pushing hydraulic cylinder, or one end of the rack piston is close to the end face of the rack-pushing hydraulic cylinder and there is a spatial distance between the other end and the end face of the rack-pushing hydraulic cylinder. At this time, the hydraulic motor is started to rotate, driving the spline shaft to rotate, and the spline shaft is keyed to the external threaded support cylinder, so it can drive the external threaded support cylinder to rotate. Since the external threaded support cylinder is threadedly connected to the rack piston threaded hole, the external threaded support cylinder can be withdrawn from the threaded hole until the outer end of the external threaded support cylinder is close to the inner end face of the rack-pushing hydraulic cylinder end face, thereby making the rack piston unable to move toward the direction of the rack-pushing hydraulic cylinder end face, and correspondingly the gear shaft is mechanically locked; when the gear shaft needs to rotate, the rack piston locking device is operated in the reverse direction to unlock the gear shaft.

[0008] As a preferred solution of the utility model, the rack-pushing hydraulic cylinders are provided with two groups, the two groups of rack-pushing hydraulic cylinders pass through the main body in parallel and the two ends are respectively located on both sides of the main body, a rack piston is provided in the middle of each group of rack-pushing hydraulic cylinders and is arranged in the main body, the gear shafts are respectively meshed with the two groups of rack pistons, and the two groups of rack-pushing hydraulic cylinders are respectively provided with rack piston locking devices.

[0009] As a preferred solution of the utility model, rack piston locking devices are respectively provided at both ends of the rack-pushing hydraulic cylinder.

[0010] This solution uses two sets of rack-pushed hydraulic cylinders as the working power source, each set includes a rack piston, the rack piston acts on the gear shaft, the two sets of rack-pushed hydraulic cylinders move relative to each other, reducing the action radius and additional torque, making the work safe and reliable, and suitable for heavy-load working occasions; rack piston locking devices are set at both ends of the rack-pushed hydraulic cylinder to ensure that the position of the gear shaft can be locked at any angle.

[0011] As a preferred solution of the utility model, a group of rack-pushed hydraulic cylinders are provided, wherein the rack-pushed hydraulic cylinders pass through the main body and the two ends are respectively located on both sides of the main body, a rack piston is provided in the middle of the rack-pushed hydraulic cylinder and is arranged in the main body, and rack piston locking devices are respectively provided at both ends of the rack-pushed hydraulic cylinder.

[0012] This solution uses a set of rack-driven hydraulic cylinders. Rack piston locking devices are set at both ends of the rack-driven hydraulic cylinders to ensure that the position of the gear shaft can be locked at any angle. It is suitable for light-load working occasions and is safe and reliable.

[0013] As a preferred solution of the utility model, the end of the rack-pushing hydraulic cylinder is provided with a high-pressure proximity switch that cooperates with the rack piston locking device. The high-pressure proximity switch of this solution is used to determine the distance between the external thread support cylinder and the end of the rack-pushing hydraulic cylinder, so as to determine the time when the hydraulic motor stops working, that is, when the end surface of the external thread support cylinder is in close contact with the end of the rack-pushing hydraulic cylinder, the hydraulic motor stops working.

[0014] As a preferred solution of the utility model, the spline shaft and the end of the rack-driven hydraulic cylinder are connected by a hole-rotating Gly ring seal. The spline shaft and the end of the rack-driven hydraulic cylinder are rotary sealed, and are preferably connected by a hole-rotating Gly ring seal.

[0015] As a preferred solution of the utility model, a rack piston locking device is provided at one end of the rack push hydraulic cylinder, a positioning plate is provided on the end face of the rack piston away from the rack piston locking device, and a positioning pin is provided on the positioning plate to cooperate with the oil inlet or the oil outlet. This solution is applicable to the case where a rack piston locking device is provided only at one end of the rack push hydraulic cylinder, in which case the oil inlet or the oil outlet is located at the center of the end of the rack push hydraulic cylinder, the positioning plate can conveniently fix the sealing ring on the rack piston, and the positioning pin is connected to the rack piston spring, which can be used to buffer the impact force caused by the rack piston end face against the rack push hydraulic cylinder end face in that direction, resulting in the rebound of the rack piston.

[0016] As a preferred solution of the utility model, the rack piston includes a rack area located in the middle and sliding sealing areas located on both sides of the rack area. Multiple sets of sealing rings are provided between the sliding sealing area and the inner cylinder wall of the rack-pushing hydraulic cylinder.

[0017] Compared with the prior art, the utility model has the beneficial effects of being able to stably stop the gear shaft at a certain position for a long time and effectively lock it during use, working safely and reliably, and occupying little space. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the internal structure of the utility model in a rotation starting state using a group of racks to push a hydraulic cylinder and a single-end rack piston locking device.

[0019] Figure 2 for Figure 1 A schematic diagram of the internal structure when the rotation is completed.

[0020] Figure 3 for Figure 2 Schematic diagram of an internal structure while locking is in progress.

[0021] Figure 4 for Figure 3 A schematic diagram of the internal structure after locking is completed.

[0022] Figure 5 The utility model adopts a set of racks to push the hydraulic cylinder and the double-end rack piston locking device in a locked state.

[0023] Figure 6 The utility model is a schematic diagram of the internal structure of the hydraulic cylinder and the single-end rack piston locking device in a state where the rotation is completed.

[0024] Figure 7 for Figure 6 Schematic diagram of an internal structure while locking is in progress.

[0025] Figure 8 for Figure 6 A schematic diagram of the internal structure after locking is completed.

[0026] Fig. 9 The utility model adopts two sets of racks to push the hydraulic cylinder and the double-end rack piston locking device in a locked state.

[0027] In the figure: 1, body 2, rack push hydraulic cylinder 3, gear shaft 4, rack piston 5, oil inlet 6, oil outlet 7, oil inlet chamber 8, oil outlet chamber

[0028] 9. Hydraulic motor 10. External thread support cylinder 11. Spline shaft

[0029] 12. Threaded hole 13. High-pressure proximity switch 14. Rotating grid ring for hole

[0030] 15, positioning plate 16, positioning pin 41, rack area 42, sliding sealing area. DETAILED DESCRIPTION

[0031] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings, and several embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0032] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this article includes any and all combinations of one or more related listed items.

[0034] See also Figure 1-Figure 9 , the utility model provides a technical solution:

[0035] A mechanically locked heavy-duty rack and pinion hydraulic device comprises a body 1, a rack-propelled hydraulic cylinder 2, and a gear shaft 3. The gear shaft 3 passes through the body 1 longitudinally, the rack-propelled hydraulic cylinder 2 passes through the body 1 transversely and is provided with a rack piston 4. The rack piston 4 meshes with the gear shaft 3 in the body 1. An oil inlet 5 and an oil outlet 6 are respectively provided at both ends of the rack-propelled hydraulic cylinder 2. The rack piston 4 is movable and located in the middle of the rack-propelled hydraulic cylinder 2. The two ends of the rack piston 4 form an oil inlet chamber 7 and an oil outlet chamber 8 with the two ends of the rack-propelled hydraulic cylinder 2. At least one end of the rack-pushing hydraulic cylinder 2 is provided with a rack piston locking device; the rack piston locking device includes a hydraulic motor 9 and an externally threaded support cylinder 10, a spline shaft 11 is provided at the output end of the hydraulic motor 9, the other end of the spline shaft 11 passes through the end of the rack-pushing hydraulic cylinder 2 and extends into the rack-pushing hydraulic cylinder 2 and is connected with the inner key of the externally threaded support cylinder 10, a threaded hole 12 is provided at the end of the rack piston 4, and the outer side of the externally threaded support cylinder 10 is connected to the threaded hole 12 through a self-locking lead angle thread; the oil inlet 5 and the oil outlet 6 are respectively connected to the hydraulic device.

[0036] There are two groups of rack-pushed hydraulic cylinders 2, which pass through the main body 1 in parallel and have their two ends located on both sides of the main body 1 respectively. A rack piston 4 is provided in the middle of each group of rack-pushed hydraulic cylinders 2 and is arranged in the main body 1. The gear shaft 3 is respectively meshed with the two groups of rack pistons 4, and the two groups of rack-pushed hydraulic cylinders 2 are respectively provided with rack piston locking devices.

[0037] Rack piston locking devices are respectively provided at both ends of the rack push hydraulic cylinder 2.

[0038] A rack-pushing hydraulic cylinder 2 is provided, the rack-pushing hydraulic cylinder 2 passes through the main body 1 and the two ends are respectively located on both sides of the main body 1, a rack piston 4 is provided in the middle of the rack-pushing hydraulic cylinder 2 and is arranged in the main body 1, and rack piston locking devices are respectively provided at both ends of the rack-pushing hydraulic cylinder 2.

[0039] The end of the rack-pushing hydraulic cylinder 2 is provided with a high-pressure-resistant proximity switch 13 cooperating with the rack piston locking device.

[0040] The spline shaft 11 is sealed and connected to the end of the rack-driven hydraulic cylinder 2 through a hole using a rotating Gly ring 14.

[0041] A rack piston locking device is provided at one end of the rack push hydraulic cylinder 2, and a positioning plate 15 is provided on the end surface of the rack piston 4 away from the rack piston locking device. The positioning plate 15 is provided with an elastic positioning pin 16 that cooperates with the oil inlet 5 or the oil outlet 6.

[0042] The rack piston 4 includes a rack area 41 located in the middle, and sliding sealing areas 42 located on both sides of the rack area 41 . A plurality of sealing rings are arranged between the sliding sealing area 42 and the inner cylinder wall of the rack-pushing hydraulic cylinder 2 .

[0043] Working process of the utility model: In the working process of the scheme, high-pressure hydraulic oil is injected into the oil inlet 5 and the oil inlet chamber 7 of the rack-propelled hydraulic cylinder 2 through the hydraulic pump station and pipelines, or high-pressure hydraulic oil is injected into the oil outlet 6 and the oil outlet chamber 7 of the rack-propelled hydraulic cylinder 2, and the hydraulic pressure acts on the end face of the rack piston 4 to generate thrust on the rack piston 4, pushing the rack piston 4 to reciprocate and drive the gear shaft 3 meshing with the rack to rotate, thereby converting the thrust generated by the input hydraulic pressure into the rotational motion of the gear shaft 3 and outputting torque; and the size of the rotation angle of the gear shaft 3 can be accurately controlled by the length of the travel distance of the rack piston 4; at this time, the spline shaft 11 and the external threaded support cylinder 10 produce translational displacement with each other;

[0044] When the rack piston 4 moves to the specified position, the oil circuits of the oil inlet 5 and the oil outlet 6 are cut off (for example, the oil circuits are cut off by switching the solenoid valve). There is either a space distance between the end faces of the rack piston 4 at both ends and the end faces of the rack-pushing hydraulic cylinder 2, or one end of the rack piston 4 is close to the end face of the rack-pushing hydraulic cylinder 2, and there is a space distance between the other end and the end face of the rack-pushing hydraulic cylinder 2. At this time, the hydraulic motor 9 is started to rotate, driving the spline shaft 11 to rotate, and the spline shaft 11 drives the external thread support cylinder 10 to rotate. Since the external thread support cylinder 10 and the gear The threaded hole 12 of the rack piston 4 is threadedly connected, and the external threaded support tube 10 can be withdrawn from the threaded hole 12 and moved along the spline shaft 11 until the outer end of the external threaded support tube 10 is close to the inner end surface of the end surface of the rack push hydraulic cylinder 2. When the rack piston locking device is provided at both ends of the rack push hydraulic cylinder 2, the outer ends of the external threaded support tubes 10 at both ends can be close to the inner end surface of the end surface of the rack push hydraulic cylinder 2, so that the rack piston 4 cannot move toward the end surface direction of the rack push hydraulic cylinder 2, and the gear shaft 3 is mechanically locked in position accordingly;

[0045] When the gear shaft 3 needs to be rotated, the rack piston locking device is operated in the reverse direction to unlock the gear shaft 3.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heavy-duty rack and pinion hydraulic device with mechanical locking, comprising a body, a rack-driven hydraulic cylinder, and a gear shaft, wherein the gear shaft passes through the body longitudinally, the rack-driven hydraulic cylinder passes through the body transversely and is provided with a rack piston, wherein the rack piston meshes with the gear shaft in the body, and is characterized in that: The two ends of the rack-pushing hydraulic cylinder are respectively provided with an oil inlet and an oil outlet, the rack piston is movably located in the middle of the rack-pushing hydraulic cylinder, and the two ends of the rack piston respectively form an oil inlet chamber and an oil outlet chamber with the two ends of the rack-pushing hydraulic cylinder, and at least one end of the rack-pushing hydraulic cylinder is provided with a rack piston locking device; The rack piston locking device comprises a hydraulic motor and an external thread support cylinder. The output end of the hydraulic motor is provided with a spline shaft. The other end of the spline shaft passes through the end of the rack push hydraulic cylinder and extends into the rack push hydraulic cylinder and is keyed to the inner side of the external thread support cylinder. The end of the rack piston is provided with a threaded hole. The outer side of the external thread support cylinder is connected to the threaded hole through a self-locking lead angle thread. The oil inlet and the oil outlet are connected to the hydraulic device respectively.

2. A mechanically locked heavy-duty rack and pinion hydraulic device according to claim 1, characterized in that: The rack-pushing hydraulic cylinders are provided with two groups, the two groups of rack-pushing hydraulic cylinders pass through the main body in parallel and the two ends are respectively located on both sides of the main body, a rack piston is provided in the middle of each group of rack-pushing hydraulic cylinders and is arranged in the main body, the gear shafts are respectively meshed with the two groups of rack pistons, and the two groups of rack-pushing hydraulic cylinders are respectively provided with rack piston locking devices.

3. A mechanically locked heavy-duty rack and pinion hydraulic device according to claim 2, characterized in that: The two ends of the rack-pushing hydraulic cylinder are respectively provided with rack piston locking devices.

4. A mechanically locked heavy-duty rack and pinion hydraulic device according to claim 1, characterized in that: The rack-pushing hydraulic cylinder is provided with a group, the rack-pushing hydraulic cylinder passes through the main body and the two ends are respectively located on both sides of the main body, the middle part of the rack-pushing hydraulic cylinder is provided with a rack piston and is arranged in the main body, and the two ends of the rack-pushing hydraulic cylinder are respectively provided with rack piston locking devices.

5. A mechanically locked heavy-duty rack and pinion hydraulic device according to claim 1, characterized in that: The end of the rack-propelled hydraulic cylinder is provided with a high-pressure resistant proximity switch matched with the rack piston locking device.

6. A mechanically locked heavy-duty rack and pinion hydraulic device according to claim 1, characterized in that: The spline shaft and the rack drive hydraulic cylinder end are connected through a hole and sealed by a rotating Gly ring.

7. A mechanically locked heavy-duty rack and pinion hydraulic device according to claim 1, characterized in that: A rack piston locking device is provided at one end of the rack-pushing hydraulic cylinder, a positioning plate is provided on the end surface of the rack piston away from the rack piston locking device, and a positioning pin cooperating with the oil inlet or the oil outlet is provided on the positioning plate.

8. A mechanically locked heavy-duty rack and pinion hydraulic device according to claim 1 or 7, characterized in that: The rack piston comprises a rack area located in the middle and sliding sealing areas located on both sides of the rack area. A plurality of sealing rings are arranged between the sliding sealing area and the inner cylinder wall of the rack-pushing hydraulic cylinder.

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