JPS58113611A - Double acting type liquid pressure cylinder - Google Patents

Abstract

PURPOSE:To prevent the energy waste of a double acting type liquid pressure cylinder by providing a separate cylinder chamber capable of communicating to a predetermined accumulator in a rod connected to a piston provided in a cylinder chamber. CONSTITUTION:When an operating oil is introduced into a cylinder chamber 37, a rod 36 is moved upward. When a port 47 is connected to a pipeline 56 and a port 48 is connected to a pipeline 57 after a rod 36 is connected to a load body and is raised, as the rod 36 descends the operating oil is flowed and stored into an accumulator 51 through the cylinder chamber 37 and passages 50, 49 as the potential energy of a load body. Thereafter, at every ascent of the rod 36 the operating oil stored in the accumulator 51 is released into the cylinder chamber 37 through a pipeline 52 and passages 49, 50, thereby the energy waste of a double acting type liquid pressure cylinder can be prevented.

Description

[Detailed description of the invention] This salary is 1! This refers to a mebble-acting type pressure cylinder that is installed on the vertical side of hydraulic elevators in construction machinery such as hydraulic excavators and hydraulic cranes.

No. Iml and No. 21a are double-acting hydraulic type V/
Hydraulic seal O as an example of a mechanical machine equipped with a
This is an explanatory diagram showing the composition of the food body.
is a plan view 0 In these figures, 1 is a rotating body;
It is arranged on the upper part of the traveling body 2, and turns by driving the turning motor 3. 4 is the left truck, and the left travel motor 5
Driven by. 6 is the right truck, right travel motor 7
Driven by. 8 is a poom, 9 is an arm, and 10 is a packet. 11 is a poom cylinder that operates the poom 8, 12 is an arm cylinder that operates the arm 9, 1
3 is a packet 10t--a packet cylinder to be activated. The boom cylinder 11 described above is configured as a double-acting hydraulic cylinder as described below.

FIG. 3 is a side sectional view showing the structure of a conventional boom cylinder. In this figure, 14 is a cylinder fz-b, 15
1 is a cylinder bottom, and 16 is a cylinder head, which form the outer port of the cylinder. 17 is a piston disposed within the cylinder tube 14, and 1g is a rod connected to this piston 17 and moves together with the piston 17. 19 is a clevis hole provided in the cylinder head 16, 20 is a clevis hole provided in the end 11 of the rod 18, of which the clevis hole 19 constitutes a connection Wt connected to the rotating body IK, and the clevis hole 20 is connected to the poom 8. It constitutes a connecting part. 921 is the cylinder head 16
The boat is connected to the cylinder chamber 22 of cylinder tube No. 1 and leads pressure oil to the right side of the p1 piston 17 in the figure.

! 3 is a boat formed near the cylinder bottom 15;
cylinder lit 22'), piston 17
Lead the pressure oil to the left side of the 0mm mark. In addition, 24 is a gland packing that prevents leakage of pressure oil from the cylinder chamber 22'.
This is a piston gasket attached to a 25tt piston 17.

By the way, 1111. Hydraulic pressure shown at +211 A,
K & t, t, poom 8, arm 9, packet 10
When performing a complete work by operating the poom 8, arm 9, arm cylinder 12, packet 10, and packet cylinder 130, the potential energy due to gravity is caused by the pressure oil being connected from the boom cylinder 11 to this poom cylinder 11. On the way to the tank, it is consumed by the throttling resistance of the valve.

Therefore, the boom cylinder 11 is connected to the boom 8, arm 9, arm cylinder 12, bucket) 10. Packet cylinder 1
The force required to raise Poom 8 against the gravity of 3 is
It is wasted and is not used for excavation work.

The present invention has been made in view of the actual situation in the prior art, and its purpose is to provide a double-acting hydraulic cylinder that can effectively utilize the potential energy of a connected load body. be.

In order to achieve this object, the present invention has a structure in which a separate cylinder chamber capable of delaying a predetermined accumulator is provided inside a rod connected to a piston arranged in the cylinder chamber.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a description will be given based on a diagram of a double-acting hydraulic cylinder according to the present invention. Figure 4 is an explanatory diagram of a hydraulic circuit equipped with an embodiment of the present invention. In the figure, 30 is a double-acting hydraulic cylinder, which includes a cylinder tube 31, a cylinder bottom V2, and a cylinder head 3.
3, a piston 35 disposed within the cylinder tube 31, a prad 36 connected to the piston 35 and moving together with the piston 35, and a ζ0
A piston 38 is disposed in a cylinder chamber 37 formed within the rod 360, and a fighting rod 39 is provided integrally with the piston 38. In other words, this hydraulic cylinder 5O
Fi, cylinder tube 31°; a first cylinder portion consisting of a cylinder bottom 32, a cylinder head 33, a piston 3s and a rod 36; a rod 36, a piston 38;
It is composed of the rod 39 and the cylinder part 1IIE2.・ In the 7 rank part of 40aEltudo 39, this 7 rank part 4
0 is a hole fastened to the cylinder bottom 32 by a bolt 41 ◇ 42 is provided at the end of the Fi rod 39 and is a hole for inserting a predetermined connecting pin, 43 is provided at the end of the rod 36 and is a hole for inserting a predetermined connecting pin It is large enough for insertion. 44 is cylinder m
Oil leakage from 34' [Gland packing to prevent
45 is a piston gasket for the piston 35, 46 is a piston gasket for the piston 38, and o47 is a boat formed in the cylinder tube 31 located at the bottom 82 of the cylinder, which communicates with the cylinder chamber 34 and connects the piston 35. O48, which guides the pressure oil to the lower part in the figure, is a boat formed in the cylinder head 33, which communicates with the cylinder chamber 34', and guides the pressure oil to the upper part of the piston 35 in the figure. 4
9 is the passage formed by the 7 langes 1i4OK of the rod 39, 5
0 is a passage passing through the rod 39 and the piston 38t,
This passage 50 communicates with the passage 49 described above and the cylinder chamber 37 formed inside the rod 36.

51 is an accumulator, which is connected to the passage 49 via a conduit 521. 53 is connected to the pipe 52 and has nine pumps, 54
55 is a check valve, and 55 is a stop valve. 56Vi
57 is a pipe connected to the boat 48, and these pipes 56 and 57 are connected to the directional control valve 5.
The trap can communicate with the pump 59 and tank 60 via 81.

In a hydraulic cylinder configured in this way, when the accumulator 51 is charged with gas and the hydraulic oil from the pump s8 is replenished in a state where it is open to the atmosphere, these hydraulic oils are is conduit s2, passage 49.
After 50t, it is introduced into the cylinder chamber 37. Therefore, when the rod 39 is fixed, #i, the above cylinder chamber 37
The p-rod 36 is moved upward by the hydraulic oil introduced into the p-rod 36. Here, a predetermined load body is connected to the rod 36, and as mentioned above, the load body is raised and the boat 47
If the boat 48t is connected to the company pipeline 56 and the boat 48t to the pipeline 57,
The potential energy of the load body increases as the cylinder rad 36 descends.
Hydraulic oil is stored in the cylinder chamber 37 and the passage 50° 49 by flowing into the aqueous emulator 51. After that, when the rod 36 is raised, the accumulator 5
The potential energy, that is, the hydraulic oil stored in pipe 52 and passage 49 . After setting, it is released into cylinder 1 [37].

When this hydraulic cylinder is applied to the boom cylinder of the hydraulic cylinder shown in Fig. 1.2 described above, the result will be as follows. That is, first, with the boat 47 and boat 48 open to the atmosphere, the rod 36, ie, the boom, is raised to a position where the packet leaves the ground by charging gas in the accumulator s1 and replenishing hydraulic oil from the pump 53.

In this state, the boats 47 and 48 are connected to the pipes 56 and 48. ．． When connected to each of the cylinder chambers 37, the weight of loads such as packets, packet cylinders, arms, arm cylinders, etc.
The potential energy of the load body including these packets and arms is transferred to the accumulator 5 when the boom is lowered.
xK11t, and when the boom is raised, the accumulator 51
and is released into the cylinder chamber 37. In this case, the boom is connected to the boat 4 from the pump 59 via the directional control valve 58t.
Piston 3 moved by pressure oil supplied to 7゜48
5 and the rod 36 move up and down.

It is more economical to make the accumulator 51 as small as possible, but in order to make the accumulator 51t as small as possible, it is necessary to increase the gas charge pressure 1 described above to a high pressure. As described above, the hydraulic cylinder of the present application is a cylinder 1i that communicates with the 1 accumulator 51.
Since it is installed in the 3710 tube 36, it can have a small diameter and has excellent pressure resistance, and there is less leakage of hydraulic oil to the outside, so it is possible to downsize the Akiemulator S1. It's also advantageous in that respect.

As mentioned above, the double-acting y# pressure cylinder of the present invention has a cylinder chamber inside the rod that can accommodate the accumulator, so it has a dangerous structure, so it is connected to the rod and is loaded with vertical movement. Storing the body's potential energy in the accumulator heats up the heat. Utilizing this potential energy when the load body rises heats the body. As a result, energy costs can be suppressed compared to conventional methods, resulting in an economical effect.

[Brief explanation of the drawing]

Figures 1 and 2E are explanatory diagrams showing the overall structure of a hydraulic cylinder as an example of a machine in which a double-acting hydraulic cylinder is used. Figure 1 is a 171NIJ, and Figure 2 is a plan view. , Figure 3 is a cross-sectional view showing the configuration of a boom cylinder cited as a conventional double-act cylinder hydraulic cylinder;
FIG. 4 is an explanatory diagram of a hydraulic path provided with an embodiment of the double-acting type hydraulic cylinder of the present invention. 30...Double-acting hydraulic cylinder, 3
1...Cylinder tube, 32...Cylinder bottom, 3'3...Cylinder head, 3
4.34', 37...Cylinder chamber, 35.38
...Piston, 36.39...Rod, 40...7/J part, 41...Bolt, 42. Shito... Hole, 44... Grand packing, 45.46... Piston packing, 47.48... Bow), 49.50...
...Aisle, 51...Accumulator, 52...
...Pipeline.

Claims (1)

[Claims] 1. A double cylinder that is equipped with a cylinder chamber, a piston disposed in this cylinder chamber, and a rod that is connected to this piston and moves together with this piston, and that can supply pressure to both sides of the piston. In the actuating jli# housing cylinder, 11KII is cut in the rod O,
The double actuating pressure cylinder is equipped with a separate cylinder chamber that can be applied to a given cylinder.