Multi-stage piston hydraulic tension cylinder with self-locking function

Abstract

The utility model relates to tension oil cylinder technical field, concretely is a kind of multistage piston hydraulic tension oil cylinder with self-locking function, including base, the inner bottom surface of base is fixedly connected with electric push rod, the output end of electric push rod is fixedly connected with connecting plate, the upper surface of base is fixedly connected with base, the upper surface of base is fixedly connected with cylinder body, the inside of cylinder body is movably connected with first piston rod, the inside of first piston rod is movably connected with second piston rod, in the utility model, the upper surface of second rack gear tooth is inclined plane, lower surface is plane, first rack is opposite, thus after self-locking, the plane portion of second rack and the plane portion of first rack contact, guiding frame is supported to mounting plate by first rack, avoid its lateral eccentric load.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic tension cylinder technology, specifically a multi-stage piston hydraulic tension cylinder with self-locking function. Background Technology

[0002] Traditional hydraulic tension cylinders are widely used in engineering machinery, mining equipment, bridge construction and other fields to provide large-tonnage tensile or lifting forces. For example, the announcement number CN220646353U describes a hydraulic cylinder with a self-locking function, which relates to the field of hydraulic cylinder technology. A connecting block is provided on the side of the first fixed block, a hydraulic cylinder is provided on the side of the first fixed block, an auxiliary connecting rod is provided on the outside of the hydraulic cylinder, and a self-locking block is provided on the upper outer surface of the first fixed block.

[0003] Although the above-mentioned device can be self-locked by a self-locking block, when used in a multi-stage piston hydraulic tension cylinder, the cantilever length increases as the multi-stage pistons extend one after another, which can easily generate lateral load. In addition, the multi-stage piston rod itself is a hollow structure, and slotting its surface will affect its strength. Utility Model Content

[0004] The purpose of this invention is to provide a multi-stage piston hydraulic tension cylinder with a self-locking function to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A multi-stage piston hydraulic tension cylinder with self-locking function includes a base, an electric push rod fixedly connected to the inner bottom surface of the base, a connecting plate fixedly connected to the output end of the electric push rod, a base fixedly connected to the upper surface of the base, a cylinder body fixedly connected to the upper surface of the base, a first piston rod movably connected inside the cylinder body, and a second piston rod movably connected inside the first piston rod.

[0007] A limiting mechanism is fixedly connected to the upper surface of the base. The limiting mechanism includes a guide frame, an upper connecting frame, and a mounting plate. The guide frame is fixedly connected to the upper surface of the base, the upper connecting frame is fixedly connected to the upper end of the guide frame, and the mounting plate is fixedly connected to the upper end of the second piston rod. Two first racks are fixedly connected to the lower surface of the mounting plate.

[0008] Furthermore, a lifting plate is fixedly connected to the upper surface of the connecting plate, and the upper surface of the lifting plate has an oblique opening.

[0009] Furthermore, the limiting mechanism further includes a second rack, a limiting post, and a spring. The second rack is embedded and movably connected to the inner surface of the upper connecting frame, and the limiting post is fixedly connected to the outer surface of the second rack. The second rack is embedded and movably connected to the upper connecting frame through the limiting post, and the spring is nested and connected to the outer surface of the limiting post.

[0010] Furthermore, the lifting plate and the guide frame are slidably connected, the lifting plate is slidably connected through an oblique opening and a second rack, the first rack and the guide frame are slidably connected, and the second rack and the first rack are engaged.

[0011] Furthermore, one end of the spring contacts the second rack, and the other end of the spring contacts the upper connecting frame.

[0012] Furthermore, the upper surface of the base is provided with mounting holes, an electric push rod energy storage power supply is fixedly connected inside the base, a controller is fixedly connected inside the base, and an inspection door is hinged to the outer surface of the base.

[0013] Furthermore, a first end cap is fixedly connected to the upper end of the cylinder body, and a second end cap is fixedly connected to the upper end of the first piston rod.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. When the electric push rod pushes the connecting plate and the lifting plate to rise, the inclined plate contacts the second rack and pushes it to move outward. The spring is compressed, and the second rack separates from the first rack. At this time, the second piston rod and the first piston rod can retract. Conversely, when the inclined plate and the second rack separate, under the elastic force of the spring, the first rack and the second rack mesh, preventing the second piston rod and the first piston rod from retracting, thus achieving a self-locking function. In addition, the upper surface of the second rack's locking teeth is inclined and the lower surface is flat, while the first rack is the opposite. Therefore, after self-locking, the flat part of the second rack contacts the flat part of the first rack, and the guide frame cooperates with the first rack to support the mounting plate and prevent it from being laterally loaded.

[0016] 2. Due to the elastic action of the spring, when the electric push rod is reset, the second rack can automatically rebound to ensure the meshing state with the first rack, so that the second piston rod and the first piston rod return to the self-locking state. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the base of this utility model;

[0019] Figure 3 This is a schematic diagram of the disassembled structure of the limiting mechanism of this utility model;

[0020] Figure 4 This is a schematic diagram of the cross-sectional structure of the cylinder block of this utility model.

[0021] In the diagram: 1. Base; 101. Mounting hole; 102. Electric push rod; 103. Energy storage power supply; 104. Controller; 105. Inspection door; 2. Connecting plate; 201. Lifting plate; 202. Slanted opening; 3. Limiting mechanism; 301. Guide frame; 302. Upper connecting frame; 303. First rack; 304. Second rack; 305. Limiting post; 306. Spring; 307. Mounting plate; 4. Base; 5. Cylinder; 501. First piston rod; 502. Second piston rod; 503. First end cap; 504. Second end cap. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-4 In this embodiment of the utility model, a multi-stage piston hydraulic tension cylinder with self-locking function includes a base 1, an electric push rod 102 is fixedly connected to the inner bottom surface of the base 1, a connecting plate 2 is fixedly connected to the output end of the electric push rod 102, a base 4 is fixedly connected to the upper surface of the base 1, a cylinder body 5 is fixedly connected to the upper surface of the base 4, a first piston rod 501 is movably connected inside the cylinder body 5, and a second piston rod 502 is movably connected inside the first piston rod 501.

[0024] A limiting mechanism 3 is fixedly connected to the upper surface of the base 1. The limiting mechanism 3 includes a guide frame 301, an upper connecting frame 302, and a mounting plate 307. The guide frame 301 is fixedly connected to the upper surface of the base 1, the upper connecting frame 302 is fixedly connected to the upper end of the guide frame 301, and the mounting plate 307 is fixedly connected to the upper end of the second piston rod 502. Two first racks 303 are fixedly connected to the lower surface of the mounting plate 307.

[0025] Specifically, during self-locking, the output end of the electric push rod 102 pushes the connecting plate 2 upward, causing the limiting mechanism 3 to start working. The guide frame 301 cooperates with the connecting frame 302 to form a stable guiding mechanism. When the second piston rod 502 extends, it cooperates with the mounting plate 307 to apply force to the first rack 303. The first rack 303 can slide freely inside the guide frame 301.

[0026] Example 1

[0027] like Figure 1-4 As shown, a lifting plate 201 is fixedly connected to the upper surface of the connecting plate 2. The upper surface of the lifting plate 201 has an oblique opening 202. The limiting mechanism 3 also includes a second rack 304, a limiting post 305, and a spring 306. The second rack 304 is embedded and movably connected to the inner surface of the upper connecting frame 302. The limiting post 305 is fixedly connected to the outer surface of the second rack 304. The second rack 304 is movably connected to the upper connecting frame 302 through the limiting post 305. The spring 306 is nested and connected to the outer surface of the limiting post 305.

[0028] In this embodiment, when the electric push rod 102 pushes the connecting plate 2 and the lifting plate 201 to rise, the inclined opening 202 contacts the second rack 304 and pushes it to move outward. The spring 306 is compressed, and the second rack 304 separates from the first rack 303. At this time, the second piston rod 502 and the first piston rod 501 can retract. Conversely, when the inclined opening 202 and the second rack 304 separate, under the elastic force of the spring 306, the first rack 303 and the second rack 304 mesh, preventing the second piston rod 502 and the first piston rod 501 from retracting, thus achieving a self-locking function. In addition, the upper surface of the second rack 304 is inclined and the lower surface is flat, while the first rack 303 is the opposite. Therefore, after self-locking, the flat part of the second rack 304 contacts the flat part of the first rack 303, and the mounting plate 307 is supported by the guide frame 301 in conjunction with the first rack 303.

[0029] like Figure 1-4 As shown, the lifting plate 201 and the guide frame 301 are slidably connected. The lifting plate 201 is slidably connected to the second rack 304 through the inclined opening 202. The first rack 303 is slidably connected to the guide frame 301. The second rack 304 is engaged with the first rack 303. One end of the spring 306 is in contact with the second rack 304, and the other end of the spring 306 is in contact with the upper connecting frame 302.

[0030] In this embodiment, due to the elastic action of the spring 306, when the electric push rod 102 is reset, the second rack 304 can automatically rebound to ensure the meshing state with the first rack 303, so that the second piston rod 502 and the first piston rod 501 return to the self-locking state.

[0031] Example 2

[0032] Based on Embodiment 1, in order to overcome the problem that it is inconvenient to control the electric push rod 102 in Embodiment 1.

[0033] like Figure 1-4As shown, the upper surface of the base 1 has a mounting hole 101, the inside of the base 1 is fixedly connected to an electric push rod 102 and an energy storage power supply 103, the inside of the base 1 is fixedly connected to a controller 104, the outer surface of the base 1 is hinged to an inspection door 105, the upper end of the cylinder 5 is fixedly connected to a first end cover 503, and the upper end of the first piston rod 501 is fixedly connected to a second end cover 504.

[0034] In this embodiment, the controller 104 is electrically connected to the energy storage power supply 103. The controller 104 is used to control the start and stop of the electric push rod 102. The maintenance door 105 facilitates the maintenance and replacement of the energy storage power supply 103 and the controller 104. The first end cover 503 and the second end cover 504 are used to seal the cylinder body 5 and the first piston rod 501 to prevent hydraulic oil leakage.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-stage piston hydraulic tension cylinder with self-locking function, comprising a base (1), an electric push rod (102) fixedly connected to the inner bottom surface of the base (1), a connecting plate (2) fixedly connected to the output end of the electric push rod (102), a base (4) fixedly connected to the upper surface of the base (1), a cylinder body (5) fixedly connected to the upper surface of the base (4), a first piston rod (501) movably connected inside the cylinder body (5), and a second piston rod (502) movably connected inside the first piston rod (501); Its features are, A limiting mechanism (3) is fixedly connected to the upper surface of the base (1), the limiting mechanism (3) comprising: The guide frame (301) is fixedly connected to the upper surface of the base (1); The upper connecting frame (302) is fixedly connected to the upper end of the guide frame (301); The mounting plate (307) is fixedly connected to the upper end of the second piston rod (502), and two first racks (303) are fixedly connected to the lower surface of the mounting plate (307).

2. The multi-stage piston hydraulic tension cylinder with self-locking function according to claim 1, characterized in that, A lifting plate (201) is fixedly connected to the upper surface of the connecting plate (2), and a slanted opening (202) is provided on the upper surface of the lifting plate (201).

3. The multi-stage piston hydraulic tension cylinder with self-locking function according to claim 2, characterized in that, The limiting mechanism (3) also includes: The second rack (304) is embedded in and movably connected to the inner surface of the upper connecting frame (302); The limiting post (305) is fixedly connected to the outer surface of the second rack (304), and the second rack (304) is movably connected to the upper connecting frame (302) through the limiting post (305); Spring (306) is nested and connected to the outer surface of limit post (305).

4. The multi-stage piston hydraulic tension cylinder with self-locking function according to claim 3, characterized in that, The lifting plate (201) and the guide frame (301) are slidably connected. The lifting plate (201) is slidably connected through the inclined hole (202) and the second rack (304). The first rack (303) and the guide frame (301) are slidably connected. The second rack (304) and the first rack (303) are engaged.

5. The multi-stage piston hydraulic tension cylinder with self-locking function according to claim 3, characterized in that, One end of the spring (306) contacts the second rack (304), and the other end of the spring (306) contacts the upper connecting frame (302).

6. The multi-stage piston hydraulic tension cylinder with self-locking function according to claim 1, characterized in that, The upper surface of the base (1) is provided with mounting holes (101), an electric push rod (102) and an energy storage power supply (103) are fixedly connected inside the base (1), a controller (104) is fixedly connected inside the base (1), and an inspection door (105) is hinged to the outer surface of the base (1).

7. The multi-stage piston hydraulic tension cylinder with self-locking function according to claim 1, characterized in that, The upper end of the cylinder (5) is fixedly connected to a first end cap (503), and the upper end of the first piston rod (501) is fixedly connected to a second end cap (504).

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