CN206144898U - Novel hydraulic cylinder - Google Patents

Abstract

The utility model discloses a novel hydraulic cylinder belongs to the pneumatic cylinder field. Novel hydraulic cylinder mainly includes piston rod, first end cover, cylinder body, first piston, first sealing washer, buffer block, second piston, second sealing washer and second end cover, first end cover links to each other with the first end of cylinder body, and the second end cover links to each other with cylinder body second end, the piston rod links to each other with first piston, and first piston links to each other with the buffer block, and first sealing washer is installed on first piston, and the second sealing washer is installed on the second piston. The utility model discloses simple structure, through the cylinder body design of chamber, second piston and buffer block of calming the anger that climbs to a high place, pneumatic cylinder itself can relax surge pressure, absorbs fluctuating pressure, has improved the traveling comfort, when the piston rod contracts extreme position, can cushion the piston, improved the life of pneumatic cylinder.

Description

New hydraulic cylinder

technical field

The utility model relates to the field of hydraulic cylinders, in particular to a novel hydraulic cylinder.

Background technique

A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swing motion). It has simple structure and reliable operation. When it is used to realize reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap, and the motion is stable, so it is widely used in various mechanical hydraulic systems. The output force of the hydraulic cylinder is proportional to the effective area of the piston and the pressure difference on both sides; the hydraulic cylinder is basically composed of a cylinder barrel and a cylinder head, a piston and a piston rod, a sealing device, a buffer device and an exhaust device.

When a hydraulic cylinder is used in a hydraulic system, it is inevitable that it will encounter sudden changes in the load. The sudden increase in the load will cause a sudden increase in the pressure of the hydraulic oil in the hydraulic cylinder, resulting in pressure fluctuations in the hydraulic circuit, which is easy to damage the hydraulic circuit and shorten the use of the hydraulic cylinder. Lifespan; when the hydraulic cylinder moves to the end of the stroke, it has a large kinetic energy. If there is no deceleration treatment, the hydraulic cylinder piston and the cylinder head will have a mechanical collision, resulting in impact and noise, which is destructive. Therefore, a buffer device needs to be installed.

Contents of the invention

The purpose of this utility model is to provide a new type of hydraulic cylinder. The hydraulic cylinder itself can ease the impact pressure, absorb the pulsating pressure, and can provide a buffering effect on the hydraulic cylinder piston to avoid mechanical collision between the hydraulic cylinder piston and the cylinder body under high-speed motion. .

In order to achieve the above object, the technical scheme adopted in the utility model is as follows:

The new hydraulic cylinder includes: piston rod 1, first end cover 2, cylinder body 3, first oil chamber 4, first piston 5, first sealing ring 6, buffer block 7, second oil chamber 8, second piston 9 , the second sealing ring 10, the high-pressure air chamber 11, the second end cover 12, the charging port 13, the second oil port 14 and the first oil port 15; the first end cover 2 is connected with the first end of the cylinder body 3, and the second The end cover 12 is connected with the second end of the cylinder body 3; the piston rod 1 is connected with the first piston 5, the first piston 5 is connected with the buffer block 7, the first sealing ring 6 is installed on the first piston 5, and the second sealing ring 10 Installed on the second piston 9.

Further, the cylinder body 3 is provided with a high-pressure air chamber 11, an annular retaining ring is provided between the second oil chamber 8 and the high-pressure air chamber 11, and a first oil port 15, a second oil port 14 and an air charging port are also provided. Mouth 13.

Further, the buffer block 7 is cylindrical, and its diameter is smaller than the diameter of the annular retaining ring hole on the cylinder body 3 .

The utility model has the following beneficial effects: when the pressure shock or pressure fluctuation is caused by the load change in the working process of the hydraulic cylinder, the second piston in the high-pressure air chamber can reciprocate according to the load, so as to ease the impact pressure and reduce the impact of the impact pressure on the hydraulic cylinder. damage, and can absorb the pulsating pressure in the hydraulic cylinder to improve the stability of operation; when the piston rod is about to shrink to the limit position, the second piston provides reverse braking force for the first piston through the buffer block, so that the first piston decelerates, The cushioning effect is provided for the first piston, so as to prevent the first piston of the hydraulic cylinder from mechanically colliding with the cylinder body under high-speed motion, thereby improving the service life of the hydraulic cylinder.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is the structural diagram of the novel hydraulic cylinder proposed by the utility model.

In the figure: 1—piston rod; 2—first end cover; 3—cylinder body; 4—first oil chamber; 5—first piston; 6—first sealing ring; 7—buffer block; 8—second oil Chamber; 9—the second piston; 10—the second sealing ring; 11—the high pressure air chamber; 12—the second end cover; 13—the charging port; 14—the second oil port; 15—the first oil port.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, the new hydraulic cylinder includes: piston rod 1, first end cover 2, cylinder body 3, first oil chamber 4, first piston 5, first sealing ring 6, buffer block 7, second oil chamber 8. The second piston 9, the second sealing ring 10, the high-pressure air chamber 11, the second end cover 12, the charging port 13, the second oil port 14 and the first oil port 15; the first end cover 2 and the cylinder body 3 One end is connected, the second end cover 12 is connected with the second end of the cylinder body 3; the piston rod 1 is connected with the first piston 5, the first piston 5 is connected with the buffer block 7, and the first sealing ring 6 is installed on the first piston 5 , the second sealing ring 10 is installed on the second piston 9; the cylinder body 3 is provided with a high-pressure air chamber 11, an annular retaining ring is provided between the second oil chamber 8 and the high-pressure air chamber 11, and a first oil chamber is also provided. The port 15, the second oil port 14 and the air charging port 13;

Concrete work process of the present utility model is as follows:

When the hydraulic cylinder is working normally, a certain pressure of high-pressure gas is charged into the high-pressure air chamber 11 through the gas charging port 13 according to the load. When the load remains unchanged, the pressure in the second oil chamber 8 remains unchanged. The force of the hydraulic oil acting on the first end surface of the second piston 9 is equal to the force of the high-pressure gas in the high-pressure air cavity 11 acting on the second end surface of the second piston 9, and the force of the second piston 9 is balanced. The left side of the ring is relatively static; when the load suddenly increases, the pressure in the second oil chamber 8 rises, and the force of the hydraulic oil in the second oil chamber 8 acting on the first end surface of the second piston 9 is greater than that of the high-pressure air chamber 11 The force of the high-pressure gas acting on the second end surface of the second piston 9, the second piston 9 moves to the direction in which the volume of the high-pressure air chamber 11 decreases, and the high-pressure air chamber 11 absorbs part of the energy generated due to the sudden change in load. On the contrary, when the load returns to At the initial value, the second piston 9 moves to the direction in which the volume of the high-pressure air chamber 11 increases, the high-pressure air chamber 11 releases energy, and the second piston 9 returns to the initial equilibrium position, and the above-mentioned second piston 9 reciprocates in the cylinder body 3 During the movement process, the impact pressure in the hydraulic cylinder can be alleviated, the pulsating pressure can be absorbed, the operation stability of the hydraulic cylinder can be improved, and the service life of the hydraulic cylinder can be improved.

When the piston rod 1 of the hydraulic cylinder is about to shrink to the limit position, the buffer block 7 passes through the annular stop ring of the cylinder body 3 and contacts the first end face of the second piston 9, and the second piston 9 is the first end face of the second piston 9 through the buffer block 7. The piston 5 provides a reverse braking force to decelerate the first piston 5 and provide a buffering effect for the first piston 5, so as to prevent the first piston 5 of the hydraulic cylinder from mechanically colliding with the cylinder body 3 under high-speed motion, further improving the hydraulic cylinder service life.

What is described above is only the embodiment of the utility model, and the specific structure and characteristic knowledge known in the scheme are not described too much here, but it does not limit the utility model. Deformation and modification are considered to be within the protection scope of the present utility model, so the protection scope of the present utility model should be defined by the claims.

Claims (3)

1. novel hydraulic cylinder, including piston rod (1), the first end cap (2), cylinder body (3), first piston (5), the first sealing ring (6), Buffer stopper (7), second piston (9), the second sealing ring (10), the second end cap (12)；First end cap (2) and cylinder body (3) first end It is connected, the second end cap (12) is connected with the end of cylinder body (3) second；Piston rod (1) is connected with first piston (5), first piston (5) with Buffer stopper (7) is connected, and on first piston (5), the second sealing ring (10) is installed in second piston for the first sealing ring (6) (9) on.

2. novel hydraulic cylinder according to claim 1, it is characterised in that the cylinder body (3) is provided with high pressure air cavity (11), Be provided with annular baffle ring between the second oil pocket (8) and high pressure air cavity (11), be additionally provided with the first hydraulic fluid port (15), the second hydraulic fluid port (14) and Inflation inlet (13).

3. novel hydraulic cylinder according to claim 1, it is characterised in that the buffer stopper (7) is cylinder, and its diameter is little The diameter in annular baffle ring hole on cylinder body (3).