RU2005226C1 - Hydraulic jack - Google Patents

Abstract

Usage: for lifting and securing a cargo Summary of the invention: a piston with a rod is installed in a housing with covers with the formation of a piston and rod cavities in communication with a pressure source and a drain. The locking device is made in the form of annular grooves on the rod. interacting with a spring-loaded latch located in the lid. The device is equipped with a spool located in the retainer with axial and radial channels in communication with the rod and piston cavities of the cylinder, respectively. In the connection lines of the piston cavity with the spool, a return valve is installed. The Porshnev cavity is connected with a pressure source and is discharged through a parallel throttle with a check valve and a controlled check valve whose control cavity is connected to one of the radial channels of the spool. A ball lock is installed in the cover on the piston side cavities. 1 zpf-ly

Description

The invention relates to mechanical engineering and can be used for lifting and securing loads.

It is an object of the invention to provide automatic unloading of the locking device during release under load. Fig. 1 schematically depicts an enclosed hydraulic jack; figure 2 - node I in figure 1; in Fig.3 - node II in Fig.1.

The hydraulic jack contains an elongated cylinder 1, a bottom cover 2, a top cover 3, a piston 4 with a rod 5 having annular grooves 6 with the angles of the forming surfaces, providing free release of the rod 5 and retaining it when locked, which with the locking device 7 provide mechanical locking of the hydraulic jack in different positions of the rod 5, hydraulic lock 8, locking the piston 4 with the rod 5 in the intermediate position when the flow of the working fluid into the hydraulic jack stops, the throttle 9, which ensures cleaning ke rod 5 pressure sufficient for. keeping the locking device 7 in the retracted position, the first non-return valve 10, which provides free passage of the working fluid when the rod 5 is discharged, and the second non-return valve 11, which prevents the passage of the working fluid into the pipeline. 12 when releasing rod 5.

In the lid 3 is a ball lock 13, holding the rod 5 in the retracted position.

The locking device 7 mounted on the cover 2 comprises a housing 14 having grooves 15, 16 and output channels 17, 18, a cover 19 on which a spool 20 is fixed, having a central channel 21 and radial holes 22, 23, the spool is a latch 24 having a protrusion 25, falling into the annular grooves. rod 5 when it is locked, an opening 26 and channels 27, 28 for the passage of the working fluid, a spring 29 supporting the spool retainer 24 in the initial position, and a key 30 that protects the spool retainer 24 from rotation.

The spool 20 consists of two parts connected by a spring 31, which makes it possible to compensate for axial and radial displacements.

The hydraulic jack with the end of the rod 5 through the support 32 rests on the ground. The load from the lifting platform 32 is transmitted through the cylinder 1, the piston 4 and the rod 5 of the hydraulic jack.

The working fluid from the pumping station through the nozzle Release, pipelines 34,

35, 36, 37, non-return valve 10, a hydraulic lock 8 is fed into the top cover 3. Under the pressure of the working fluid, the piston 38 of the ball lock 13 moves and

frees the piston 4; the release of stem 5 begins.

With the further release of the stem 5, the edge 39, acting on the edge 40 of the movable spool 24, recesses it, and with the further movement of the stem 5, the spool-retainer 24 with the protrusion 25 enters the annular groove 6 of the rod 5.

Thus, the rod 5 is stopped by the locking device 7. Locking the rod 5

can be carried out similarly in any annular groove.

To clean the rod 5, the working fluid is supplied from the pump station through the nozzle Cleaning in the rod cavity 41 of the hydraulic jack and through the channels (holes) 26, 21, 22, 27, 17, pipelines 12, 42, 37 and the second non-return valve 11 into the top cover 3 Thus, the working fluid acts on the piston 4 from two sides. Since the area of the piston cavity is larger than the area of the rod cavity, the resulting force will act on the piston towards the stem outlet and unload the locking device 7. Further

an increase in pressure causes the spool retainer 24 to move.

The protrusion 25 is recessed in the housing 14, the hole 23 is displaced, the working fluid through the channels 28, 18 and the pipeline 43 popa 5 gives in the hydraulic lock 8, opening it. In this case, the channel 27 is closed and the working fluid in the pipeline 12 and then does not flow.

Thus, the working fluid through pipelines 37, 34, through the throttle 9 of

0, the piston cavity of the hydraulic jack is discharged, and the rod 5 begins to be cleaned, which at the end of the stroke is secured by a ball lock 13. During the removal of the rod 5, the throttle 9 maintains the pressure necessary to hold the retainer 24 with the protrusion 25 in the recessed position. The use of a rod with annular grooves and a spool-retainer allows you to fix the lifting platform on

0 different heights with a step equal to the pitch of the annular grooves on the jack rod, and automatically unload the locking device, increasing the reliability of the jack, and also because

5 there is no need for the operator to carry out manipulations to unload the locking device reduces operating costs by 15-20%, (56) USSR Copyright Certificate N 709846, cl. F 16 B 15/26, 1978.

I

Rf / rss

Fie.

"If r n, 6

imLLLL

 / / / / R zapfex, /

f w

to

L

f w - "

/ .;