Self-falling prevention mechanism of hydraulic oil cylinder

Abstract

The utility model discloses a self-falling prevention mechanism of a hydraulic oil cylinder. The self-falling prevention mechanism comprises a cylinder body and a piston movably installed in the cylinder body. The hydraulic cylinder is characterized in that the piston comprises an upper piston and a lower piston inserted into the upper piston; a middle cavity is formed between the upper piston and the lower piston; a supplementing oil pipe and a one-way valve arranged on the supplementing oil pipe are connected between the bottom of the cylinder body and the middle cavity. Hydraulic oil at the bottom of the cylinder body flows into the supplementing oil pipe, pushes away the one-way valve and then flows into the middle cavity, the hydraulic oil in the middle cavity continues to push the upper piston to keep an ejection state, the upper piston is prevented from falling back, and the lower piston moves downwards along with reduction of the hydraulic oil at the bottom of the cylinder body. Therefore, the hydraulic oil cylinder can be continuously used.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic oil cylinders, in particular to an anti-self-falling mechanism of a hydraulic oil cylinder. Background Art

[0002] In today's society, hydraulic cylinders are widely used. For example, hydraulic cylinders are generally used to lift heavy objects such as bridges, cars, and large cargoes. In addition, the hydraulic cylinders in such occasions are generally in use for a long time. Under long-term load-bearing conditions, hydraulic oil leakage and other problems are likely to occur in the hydraulic cylinders, causing the hydraulic cylinders to be unable to be used normally. The load-bearing objects drop rapidly as the hydraulic oil pressure decreases, which can easily cause safety accidents. For this reason, an anti-self-fall mechanism for the hydraulic cylinder is proposed, which can continue to keep the piston in the ejected state for use when the hydraulic cylinder falls. Summary of the Invention

[0003] The purpose of the utility model is to solve the above problems and to provide a hydraulic oil cylinder anti-self-falling mechanism.

[0004] In order to achieve the above-mentioned purpose, the utility model provides the following technical solution: an anti-self-fall mechanism of a hydraulic cylinder, comprising a cylinder body and a piston movably installed in the cylinder body; its characteristic is that the piston comprises an upper piston and a lower piston plugged into the upper piston; an intermediate cavity is formed between the upper piston and the lower piston; a supplementary oil pipe and a one-way valve arranged on the supplementary oil pipe are connected between the bottom of the cylinder body and the intermediate cavity.

[0005] Preferably, a plug-in groove is provided at the bottom of the upper piston; and a plug-in rod adapted to the plug-in groove is provided at the top of the lower piston.

[0006] Preferably, the outer diameter of the plug-in rod is smaller than the inner diameter of the plug-in slot.

[0007] Preferably, the upper piston and the lower piston can move together or separately.

[0008] Preferably, the one-way valve includes a valve body, an adjusting block adjustably installed in the valve body, a spring installed on the adjusting block, and a ball connected to the spring.

[0009] Preferably, a hydraulic oil channel is provided on the adjusting block.

[0010] Preferably, the hydraulic oil channel is hexagonal.

[0011] Preferably, a plurality of sealing rings and wear-resistant rings are installed between the upper piston, the lower piston and the cylinder body.

[0012] Preferably, the bottom of the cylinder body is further provided with an oil inlet and outlet.

[0013] The beneficial effects of the utility model are as follows: the hydraulic oil at the bottom of the cylinder body flows into the supplementary oil pipe and pushes open the one-way valve, and then flows into the middle cavity. The hydraulic oil in the middle cavity continues to push the upper piston to maintain the ejected state, preventing the upper piston from falling back, and the lower piston moves downward as the hydraulic oil at the bottom of the cylinder body decreases, so that the hydraulic cylinder can continue to be used. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the present utility model.

[0015] Figure 2 This utility model Figure 1 A partial enlarged view of point A in the middle.

[0016] Figure 3 It is a top view of the regulating block of the utility model.

[0017] Legend: 1. Cylinder body; 101. Oil inlet and outlet; 2. Upper piston; 201. Connecting groove; 3. Lower piston; 301. Connecting rod; 4. Intermediate cavity; 5. Oil supply pipe; 501. One-way valve; 502. Valve body; 503. Adjusting block; 504. Spring; 505. Ball; 506. Hydraulic oil channel; 507. Oil pipe joint; 6. Sealing ring; 7. Wear-resistant ring. DETAILED DESCRIPTION

[0018] Below we further explain the anti-self-fall mechanism of the hydraulic oil cylinder described in the utility model with reference to the accompanying drawings.

[0019] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, etc., are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0020] See attached Figure 1-31 and 2. The camshaft 24 is connected to the bottom of the oil pump 2 by the hydraulic pump 21, and the camshaft 25 is connected to the bottom of the oil pump 21 by the hydraulic pump 22. When the oil pump 21 is in the oil pump 22 position, the camshaft 24 is turned off, and the camshaft 25 is turned off.

[0021] See attached Figure 1 As shown, a plug-in groove 201 is provided at the bottom of the upper piston 2; a plug-in rod 301 is provided on the top of the lower piston 3, which is adapted to the plug-in groove 201; the outer diameter of the plug-in rod 301 is smaller than the inner diameter of the plug-in groove 201; the upper piston 2 and the lower piston 3 can move together at the same time or move separately; the plug-in rod 301 on the lower piston 3 is plugged into the plug-in groove 201 on the upper piston 2, so that an intermediate cavity 4 is formed between the upper piston 2 and the lower piston 3, and the hydraulic oil passing through the bottom of the cylinder body 1 flows into the replenishing oil pipe 5 and pushes open the one-way valve 501, and then flows into the intermediate cavity 4. The hydraulic oil in the intermediate cavity 4 continues to push the upper piston 2 to maintain the ejection state, preventing the upper piston 2 from falling back.

[0022] See attached Figure 2-3 As shown, the one-way valve 501 includes a valve body 502, an adjusting block 503 adjustable by a thread installed in the valve body 501, a spring 504 installed on the adjusting block 503, and a ball 505 connected to the spring 504; a hydraulic oil channel 506 is provided on the adjusting block 503; the hydraulic oil channel 506 is hexagonal; the ball 505 is pushed by the hydraulic oil to compress the spring 504, and then the hydraulic oil flows into the cylinder through the hydraulic oil channel 506 on the adjusting block 503, thereby facilitating automatic switching according to the pressure of the hydraulic oil; the elastic force of the spring is adjusted by inserting a hexagonal wrench into the hydraulic oil channel 506 and rotating the adjusting block 503, thereby facilitating use under different hydraulic pressures.

[0023] See attached Figure 1 As shown, a plurality of sealing rings 6 and wear-resistant rings 7 are installed between the upper piston 2 and the lower piston 3 and the cylinder body 1; an oil inlet and outlet 101 is also provided at the bottom of the cylinder body 1.

[0024] During the use of the present invention, the hydraulic oil enters the cylinder through the oil inlet and outlet 101, pushing the lower piston 3 to move upward, and the lower piston 3 pushes the upper piston 2 to move upward. When the lower piston 3 falls by itself, as the lower piston 3 falls, the oil pressure in the supplementary oil pipe 5 increases, and the hydraulic pressure pushes the one-way valve 501 to open, and then the hydraulic oil in the supplementary oil pipe 5 enters the middle cavity 4 between the lower piston 3 and the upper piston 2. As the hydraulic oil in the middle cavity 4 enters, the hydraulic oil continues to support the upper piston 2 upward, so that the upper piston 2 always remains in the ejected state. At the same time, the hydraulic oil to the bottom of the cylinder 1 enters the middle cavity 4, and the hydraulic oil in the middle cavity 4 pushes the lower piston 3 to move downward.

[0025] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the scope of protection of the present invention.

Claims

1. A hydraulic cylinder anti-fall mechanism, comprising a cylinder body (1) and a piston movably mounted in the cylinder body (1); characterized in that The piston comprises an upper piston (2) and a lower piston (3) plugged into the upper piston (2); an intermediate cavity (4) is formed between the upper piston (2) and the lower piston (3); a supplementary oil pipe (5) and a one-way valve (501) provided on the supplementary oil pipe (5) are connected between the bottom of the cylinder body (1) and the intermediate cavity (4).

2. The anti-fall mechanism of a hydraulic cylinder according to claim 1, characterized in that: The bottom of the upper piston (2) is provided with a plug-in slot (201); the top of the lower piston (3) is provided with a plug-in rod (301) adapted to the plug-in slot (201).

3. The anti-fall mechanism of a hydraulic cylinder according to claim 2, characterized in that: The outer diameter of the plug-in rod (301) is smaller than the inner diameter of the plug-in slot (201).

4. The anti-fall mechanism of a hydraulic cylinder according to claim 2, characterized in that: The upper piston (2) and the lower piston (3) can move together or separately.

5. The anti-fall mechanism of a hydraulic cylinder according to claim 1, characterized in that: The one-way valve (501) comprises a valve body (502), an adjusting block (503) adjustably mounted in the valve body (502), a spring (504) mounted on the adjusting block (503), and a ball (505) connected to the spring (504).

6. The anti-fall mechanism of the hydraulic cylinder according to claim 5, characterized in that: The regulating block (503) is provided with a hydraulic oil channel (506).

7. The anti-fall mechanism of the hydraulic cylinder according to claim 6, characterized in that: The hydraulic oil channel (506) is hexagonal.

8. The anti-self-fall mechanism of a hydraulic cylinder according to claim 1, characterized in that: A plurality of sealing rings (6) and wear-resistant rings (7) are installed between the upper piston (2), the lower piston (3) and the cylinder body (1).

9. The anti-fall mechanism of a hydraulic cylinder according to claim 8, characterized in that: The bottom of the cylinder body (1) is also provided with an oil inlet and outlet (101).

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