Sequential telescopic oil cylinder

Abstract

This utility model relates to the field of hydraulic cylinder technology. Addressing the problem in existing combined hydraulic cylinders where the movement trajectory of the rod is often discontinuous and uneven due to wobbling in the connection or positional relationship between multiple adjacent cylinders, this invention specifically discloses a sequential telescopic combined hydraulic cylinder. It includes a large hydraulic cylinder and a small hydraulic cylinder arranged in parallel. The large hydraulic cylinder comprises a large cylinder body, a large cylinder piston rod, and a movable cylinder sleeved around the periphery of the large cylinder body. The small hydraulic cylinder is detachably connected to the outer wall of the movable cylinder. One end of the large cylinder piston rod passes through the inner cavity of the large cylinder body, and the other end passes sequentially through the inner cavity of the large cylinder body and the inner cavity of the movable cylinder. When the large cylinder piston rod moves to a position away from the large cylinder body, the inner cavity of the large cylinder body and the inner cavity of the movable cylinder are connected through a vent pipe. The large and small hydraulic cylinders are not only connected by the outer walls of the cylinder bodies but also by the movable cylinder in the same direction, ensuring stable connection and positional relationship between the parallel cylinders during operation.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, and more specifically, to a sequential telescopic combination hydraulic cylinder. Background Technology

[0002] A hydraulic cylinder, also known as a hydraulic cylinder, is a hydraulic actuator that converts hydraulic energy into mechanical energy to perform linear reciprocating or oscillating motion. A hydraulic cylinder mainly consists of a cylinder body, a piston sleeve, and a piston. When hydraulic oil enters the cylinder body, the piston, which passes through the piston sleeve and is embedded in the cylinder body, is pushed outward by hydraulic pressure, thus generating mechanical motion. When hydraulic oil is discharged from the cylinder body, the piston is pushed back into the cylinder cavity by external force, completing the linear reciprocating motion of the cylinder.

[0003] However, the movement path and speed of a hydraulic cylinder are limited by factors such as the oil flow rate and piston area within the cylinder. The stroke and speed of a single hydraulic cylinder are usually fixed. In complex working conditions, there are often requirements to use different speeds and ultra-long strokes depending on the stage and scenario. Based on this, a method of combining multiple hydraulic cylinders in parallel has been proposed. This allows for a certain degree of control over one or more cylinders to change and expand the total output force, speed, and movement path of the piston. For example, patent CN207073498U provides a parallel hydraulic cylinder, including a main cylinder and branch cylinders that are fixedly connected vertically. A main piston rod runs through the main cylinder, and a main piston disc that seals the bottom of the main cylinder is fixed to the bottom of the main piston rod. Each branch cylinder has at least two sets of branch cylinders that provide different output forces. The lower outer wall of each branch cylinder is fixed to an end plate. Each branch cylinder has a branch piston rod with a branch piston at its end. The outer end of the branch piston rod of each branch cylinder is fixedly connected to the main piston disc. A combined hydraulic cylinder is formed by using two piston-type hydraulic cylinders: the piston rod of one piston-type hydraulic cylinder serves as the cylinder body of the other piston-type hydraulic cylinder, thereby increasing the total stroke of the cylinder's extension and retraction.

[0004] However, in existing combined hydraulic cylinders as described above, the positional stability between multiple associated hydraulic cylinders is poor. During use, problems such as discontinuous and uneven movement of the rod's entire motion trajectory can easily occur due to swaying in the connection or positional relationship between multiple adjacent hydraulic cylinders. Utility Model Content

[0005] The purpose of this invention is to solve the problem in existing combined hydraulic cylinders where the movement trajectory of the rod is discontinuous and uneven due to swaying in the connection or position of multiple adjacent cylinders. This application provides a sequential telescopic combined hydraulic cylinder, composed of parallel-connected large and small hydraulic cylinders. The large and small cylinders are not only connected by the outer walls of their respective cylinder bodies, but also by movable cylinders in the same direction, ensuring that the connection and positional relationship between the parallel cylinders remain stable during operation.

[0006] This utility model is achieved through the following technical solution:

[0007] This utility model provides a sequential telescopic combination hydraulic cylinder, including a large hydraulic cylinder and a small hydraulic cylinder arranged in parallel. The large hydraulic cylinder includes a large cylinder body and a large cylinder piston rod. A movable cylinder is sleeved on the outer wall of the large cylinder body. The small hydraulic cylinder is detachably connected to the outer wall of the movable cylinder in parallel. One end of the large cylinder piston rod passes through the inner cavity of the large cylinder body, and the other end of the large cylinder piston rod passes through the inner cavity of the large cylinder body and the inner cavity of the movable cylinder in sequence. When the large cylinder piston rod moves to a position away from the large cylinder body, the inner cavity of the large cylinder body and the inner cavity of the movable cylinder can be connected through a vent pipe.

[0008] Preferably, the large cylinder piston rod includes a large cylinder rod body and a large cylinder piston head, wherein the large cylinder piston head is disposed at the end of the large cylinder rod body located in the inner cavity of the large cylinder body.

[0009] Preferably, the large cylinder body has a large cylinder through hole at the position where the large cylinder piston rod passes through, and the large cylinder body also has a venting channel near the large cylinder through hole. One end of the venting channel is connected to the inner cavity of the large cylinder body, and the other end of the venting channel can be connected to the inner cavity of the movable cylinder.

[0010] Preferably, the end of the cylinder rod away from the cylinder piston head is a sliding thick rod, and the end of the cylinder rod close to the cylinder piston head is a venting thin rod, so that when the cylinder rod moves to a position away from the inner cavity of the cylinder, the side wall of the venting thin rod is spaced apart from the inner wall of the cylinder through hole.

[0011] Preferably, a rod connecting channel is provided on one side of the movable cylinder, and a cylinder connecting channel is provided on the opposite side of the movable cylinder. The rod of the large cylinder passes through the rod connecting channel and is slidably connected to the rod connecting channel. The large cylinder body passes through the cylinder connecting channel and is slidably connected to the cylinder connecting channel on its outer side.

[0012] Preferably, the small cylinder includes a small cylinder body and a small cylinder piston rod, and the outer wall of the small cylinder body is detachably connected to the outer wall of the movable cylinder.

[0013] The technical solution of this utility model has the following beneficial effects:

[0014] The sequential telescopic combination hydraulic cylinder of this utility model consists of parallel large and small hydraulic cylinders. The large and small hydraulic cylinders are not only connected by the outer wall of the cylinder body, but also connected by movable cylinders in the same direction. This allows the connection and positional relationship between the parallel hydraulic cylinders to remain stable during operation, solving the problem of poor positional stability between multiple associated hydraulic cylinders in existing combination hydraulic cylinders. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the sequential telescopic combination hydraulic cylinder in Example 1;

[0016] Figure 2 This is a partial cross-sectional view of the sequential telescopic combination hydraulic cylinder in Example 1;

[0017] Figure 3 This is a cross-sectional view of the large hydraulic cylinder in Example 1;

[0018] Figure 4 for Figure 3 A magnified structural diagram of part A in the diagram.

[0019] Reference numerals in the attached diagram: 1-Large hydraulic cylinder, 11-Large cylinder body, 111-Large cylinder through hole, 112-Ventilation channel, 12-Large cylinder piston rod, 121-Large cylinder rod body, 122-Large cylinder piston head, 123-Sliding thick rod, 124-Ventilation thin rod, 2-Small hydraulic cylinder, 21-Small cylinder body, 22-Small cylinder piston rod, 3-Moving cylinder, 31-Rod connecting channel, 32-Cylinder connecting channel. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below. Where specific conditions are not specified in the embodiments, they are performed according to conventional conditions or conditions recommended by the manufacturer; where the manufacturers of instruments, equipment, reagents, or raw materials are not specified, they are all conventional products that can be purchased commercially. The following are specific embodiments in conjunction with the accompanying drawings.

[0021] like Figures 1 to 4 As shown, this embodiment provides a sequential telescopic combination hydraulic cylinder, including a large hydraulic cylinder 1 and a small hydraulic cylinder 2 arranged in parallel. The large hydraulic cylinder 1 includes a large cylinder body 11 and a large cylinder piston rod 12. A movable cylinder 3 is sleeved on the outer wall of the large cylinder body 11. The outer walls of the small hydraulic cylinder 2 and the movable cylinder 3 are detachably connected side by side. One end of the large cylinder piston rod 12 passes through the inner cavity of the large cylinder body 11, and the other end of the large cylinder piston rod 12 passes through the inner cavity of the large cylinder body 11 and the inner cavity of the movable cylinder 3 in sequence. When the large cylinder piston rod 12 moves to a position away from the large cylinder body 11, the inner cavity of the large cylinder body 11 and the inner cavity of the movable cylinder 3 can be connected through a vent pipe.

[0022] In this embodiment, the large cylinder piston rod 12 includes a large cylinder rod body 121 and a large cylinder piston head 122. The large cylinder piston head 122 is located at the end of the large cylinder rod body 121 within the inner cavity of the large cylinder body 11. A large cylinder through hole 111 is provided at the position through which the large cylinder piston rod 12 passes. A venting channel 112 is also provided near the large cylinder through hole 111 in the large cylinder body 11. One end of the venting channel 112 communicates with the inner cavity of the large cylinder body 11, and the other end of the venting channel 112 can communicate with the inner cavity of the movable cylinder 3. The end of the large cylinder rod body 121 furthest from the large cylinder piston head 122 is a sliding thick rod 123. One end of the rod 121 near the piston head 122 of the large cylinder is a venting rod 124. When the rod 121 moves to a position away from the inner cavity of the large cylinder 11, the side wall of the venting rod 124 is spaced apart from the inner wall of the large cylinder through hole 111. A rod connecting hole 31 is provided on one side of the movable cylinder 3, and a cylinder connecting hole 32 is provided on the other opposite side of the movable cylinder 3. The rod 121 of the large cylinder passes through the rod connecting hole 31 and is slidably connected to the rod connecting hole 31. The large cylinder 11 passes through the cylinder connecting hole 32 and is slidably connected to the outer wall of the large cylinder 11 and the cylinder connecting hole 32.

[0023] In this embodiment, the small cylinder 2 includes a small cylinder body 21 and a small cylinder piston rod 22. The outer wall of the small cylinder body 21 and the outer wall of the movable cylinder 3 can be connected by a bracket and multiple screws to realize the installation and disassembly of adjacent cylinders.

[0024] The sequential telescopic combination cylinder of this embodiment mainly consists of parallel large and small cylinders 2. The large and small cylinders 2 are not only connected by the outer walls of their respective cylinder bodies, but also connected in the same direction by movable cylinders 3, etc. This ensures that the connection and positional relationship between the parallel cylinders remain stable during operation, solving the problem of poor positional stability among multiple associated cylinders in existing combination cylinders. Similarly, those skilled in the art can also configure more cylinders for parallel combination based on the above concept, achieving the same range extension effect with stable positional structure.

[0025] Furthermore, the technical focus of this embodiment is mainly on the specific connection method and working method of the connecting component between the large hydraulic cylinder 1 and the small hydraulic cylinder 2. Therefore, the basic structural components of the large hydraulic cylinder 1 and the small hydraulic cylinder 2 are not described in detail above. However, those skilled in the art should understand from common knowledge that the large hydraulic cylinder 1 and the small hydraulic cylinder 2, in addition to the large cylinder body 11 or the small cylinder body 21 (i.e., cylinder barrel), the large cylinder piston rod 12 or the small cylinder piston rod 22, should also include known components such as end caps, piston rod seals, guide sleeves, and filling and exhaust mechanisms. Moreover, their working methods and principles can be directly applied to the commonly used sleeve piston cylinders on the market.

[0026] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A sequential telescopic combination oil cylinder characterized by, It includes a large hydraulic cylinder (1) and a small hydraulic cylinder (2) arranged in parallel. The large hydraulic cylinder (1) includes a large cylinder body (11) and a large cylinder piston rod (12). A movable cylinder (3) is sleeved on the outer side wall of the large cylinder body (11). The small hydraulic cylinder (2) is detachably connected to the outer side wall of the movable cylinder (3). One end of the piston rod (12) of the large cylinder passes through the inner cavity of the large cylinder body (11), and the other end of the piston rod (12) passes through the inner cavity of the large cylinder body (11) and the inner cavity of the movable cylinder (3) in sequence. When the piston rod (12) of the large cylinder moves to a position away from the large cylinder body (11), the inner cavity of the large cylinder body (11) and the inner cavity of the movable cylinder (3) can be connected through a ventilation pipe.

2. The sequence telescoping oil cylinder of claim 1, wherein, The large cylinder piston rod (12) includes a large cylinder rod body (121) and a large cylinder piston head (122), wherein the large cylinder piston head (122) is located at the end of the large cylinder rod body (121) located in the inner cavity of the large cylinder body (11).

3. The sequence telescoping oil cylinder of claim 2, wherein, The large cylinder body (11) has a large cylinder through hole (111) at the position through which the large cylinder piston rod (12) passes. The large cylinder body (11) also has a venting channel (112) at the position near the large cylinder through hole (111). One end of the venting channel (112) is connected to the inner cavity of the large cylinder body (11), and the other end of the venting channel (112) can be connected to the inner cavity of the movable cylinder (3).

4. The sequence telescoping oil cylinder of claim 3, wherein, The end of the cylinder rod (121) away from the cylinder piston head (122) is a sliding thick rod (123), and the end of the cylinder rod (121) near the cylinder piston head (122) is a venting thin rod (124). When the cylinder rod (121) moves to a position away from the inner cavity of the cylinder body (11), the side wall of the venting thin rod (124) is spaced apart from the inner wall of the cylinder through hole (111).

5. The sequence telescoping oil cylinder according to any one of claims 2 to 4, characterized in that, One side of the movable cylinder (3) is provided with a rod connecting channel (31), and the other opposite side of the movable cylinder (3) is provided with a cylinder connecting channel (32). The large cylinder rod (121) passes through the rod connecting channel (31) and is slidably connected to the rod connecting channel (31). The large cylinder body (11) passes through the cylinder connecting channel (32) and is slidably connected to the cylinder connecting channel (32).

6. The sequential telescoping combination oil cylinder of claim 1, wherein, The small cylinder (2) includes a small cylinder body (21) and a small cylinder piston rod (22), and the outer side wall of the small cylinder body (21) is detachably connected to the outer side wall of the movable cylinder (3).

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