JPH0248560Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a column, and more particularly, to a column used as a hydraulic column or a single-acting hydraulic cylinder used in a mine shaft or the like.

Hydraulic columns and single-acting hydraulic cylinders used to support ceilings in mine shafts, etc., are extended using hydraulic pressure, etc.
Shaped to obtain the required length. However, depending on the place of use, the length of the support may be insufficient or excessive.

In such a case, conventionally, struts of different lengths are prepared in advance and the struts are selected and used to suit the location of use.

However, it is uneconomical to prepare a large number of columns in advance to select and use columns of different lengths, and it is also inconvenient to transport the entire column during use.

Therefore, in view of the above-mentioned circumstances, it is an object of the present invention to provide a new support that is more economical and convenient to use.

In order to achieve this objective, the configuration of the present invention includes a fixed length body having a hydraulic pump and a release valve, a piston slidably disposed within the fixed length body, and a piston connected to the piston. an insertion body that is slidably inserted into the fixed length body, and is formed to be extended by the operation of the hydraulic pump and contracted by the operation of the release valve. In the above, the insertion body is formed so as to be separable from the piston.

Hereinafter, the present invention will be explained based on the illustrated embodiments.

As shown in FIG. 1, the support according to the present invention includes a fixed length body 1 formed in a cylindrical shape, and a fixed length body 1 formed in a cylindrical shape.
The rod-shaped insertion body 3 is connected to the piston 2 and is slidably inserted into the length body 1. The body has a core 4.

The standard body 1 allows the piston 2 and the insertion body 3 to slide, and has a cap member 6 containing a seal 5 at its lower end. The sliding movement is guaranteed. Further, a head member 7 is fixed to the upper end of this length-length body 1, which allows the upper end of the length-length body 1 to come into contact with an underground ceiling plate or the like.

Note that the standard length body 1 has an upper end head member 7.
The interior partitioned by the intermediate body core 4 and the oil reservoir chamber A is defined as an oil reservoir chamber A.

The piston 2 has a large diameter part 2a near its upper end and a small diameter part 2b below it. The small diameter portion 2b is brought into sliding contact with the surface.
The outer circumferential surface of the inserter 3 is adjacent to the inner circumferential surface of the insertion body 3. The large diameter portion 2a is provided with a seal 8, a ring 9, etc. to ensure sliding movement between the piston 2 and the fixed length body 1.

Note that the upper end of the piston 2 is formed with a notch so as to have a smaller diameter than the lower large diameter portion 2a, and an oil chamber B is formed between the notch surface 2a' and the inner circumferential surface of the standard length body 1. are doing. This oil chamber B has an annular shape when the support column is in the most contracted state as shown. When pressurized oil is introduced through the core 4, the piston 2 is pushed down to form a cylindrical oil chamber below the core 4.

The piston 2 has a small diameter portion 2b that is connected to the insertion body 3.
It is connected to. That is, a through hole 2b' is bored in the lower end of the narrow diameter part 2b of the piston 2 in the diametrical direction, while a through hole 3' is formed in the corresponding part of the insertion body 3 opposite to the through hole 2b'. is drilled,
A pin 10 is inserted through this through hole 3' and the through hole 2b'. In this embodiment, the pin 10 is simply inserted into the through hole 3' and the through hole 2b'.
Alternatively, it may be press-fitted into the through-hole 3' and the through-hole 2b', or it may be screwed into the through-hole 3' and the through-hole 2b'.

The insertion body 3 connected to the piston 2 has an appropriate length, and has a bottom member 11 fixed to its lower end, allowing the lower end of the support to come into contact with the bottom surface of the tunnel, etc. . The insertion body 3 can be replaced with another insertion body having a different length depending on the place where the support column is used. Therefore,
The other insertion bodies are also formed so as to be able to be slidably inserted into at least the length body 1;
And, it is required that it be formed so as to be connected to the piston 2 disposed within the length measuring body 1. In this embodiment, it is necessary that the other insertion member be connected to the piston 2 through the pin 10 inserted into the through hole 2b'.

When separating the insertion body 3 from the piston 2, the support column is set to its maximum extension, and the through hole 3' drilled in the insertion body 3 is inserted into the length of the length body 1, as shown in FIG. Cap member 6 arranged at the lower end
So that it is exposed downwards, and from that state, remove pin 10.
is removed to separate the insertion body 3 from the piston 2. Therefore, in this embodiment, a spacer 12 is provided between the outer peripheral surface of the insertion member 3 and the inner peripheral surface of the opposing standard length member 1. This spacer 12 has a length shorter than the length of the narrow diameter portion 2b of the piston 2, and requires a through hole 3' in the insertion body 3 that is exposed below the lower end cap member 6 of the standard length body 1 when it is fully extended. This prevents it from being located further down. Therefore, if the expansion state of the support is to be monitored when exchanging the insertion body 3 with another insertion body, the provision of the spacer 12 can be omitted. Good too. However, if the spacer 12 is provided as in this embodiment, there is no need to monitor the extension state, which has the advantage of improving workability.

A hydraulic pump 20 and a release valve 30 are installed in the core 4 disposed in the intermediate body of the standard body 1, and the support column can be extended by operating the hydraulic pump 20. By operating the release valve 30, the extended column can be contracted.

As shown in FIG. 3, the hydraulic pump 20 has the following features:
It has a plunger 21 that is slidably disposed within an oil chamber 4a formed within the core 4. The plunger 21 has an oil passage 23 that allows communication between the pump chamber 22 at the tip of the oil chamber 4a, which is the high pressure side, and the oil reservoir chamber A, which is the back pressure side. has a suction valve 24.

The plunger 21 is moved into the oil sump chamber through the through hole 4b formed in the core 3 when moving back and forth within the oil chamber 4a by raising and lowering the handle H connected to the rear end projecting outside the core 3. The oil in A flows into the oil chamber 4a, and the oil flowing into the oil chamber 4a when the oil moves forward is transferred to the annular oil chamber B below the core 4 through the pump chamber 22 and the port 4c drilled in the core 4. It is something that is discharged inside.

Note that the hydraulic pump 20 has a check valve mechanism 2.
5, when the plunger 21 is retracted, communication between the pump chamber 12 and the port 4c is cut off, but when the plunger 21 is advanced, the pump chamber 12 and the port 4c are communicated with each other. Furthermore, the pump chamber 12 is formed to have a predetermined volume by a cap 26 screwed onto the core 4, and by screwing the cap 26, The internal volume of the pump chamber 12 can be made variable.

A relief valve 27 is connected to the hydraulic pump 20, and the relief valve 27 is connected to the third
As shown in the figure, the valve body 27a is adjacent to the outlet of the oil passage 4d bored in the core 4 so as to communicate with the port 4c communicating with the hydraulic pump 20, and the valve body 27a is connected to the outlet of the oil passage 4d. The cap 27c is screwed onto the spring 27b and the core 4 and can change the repulsive force of the spring 27b by external operation. When hydraulic pressure that overcomes the spring 27b, the repulsive force of which has been adjusted by an external operation, and moves the valve body 27a backward acts in the oil passage 4d, the high-pressure oil from the hydraulic pump 20 acts on the oil passage 4d. It bleeds off toward the storage chamber A.

As shown in FIG. 4, the release valve 30 includes a valve body 31 adjacent to an opening of an oil passage 4e formed in the core 4 and communicating with the oil reservoir chamber A;
1 toward the opening of the oil passage 4e, and a cap 33 that is screwed onto the core 4 and whose repulsive force can be changed by external operation. is needle-shaped operating rod 3
1a are arranged in series, and their tips protrude outside the core. In addition, the valve body 31 and the spring 32 are arranged in an oil chamber 4f bored in the core 4, and the oil chamber 4f communicates with the oil passage 4e and is bored in the core 4. It also communicates with a lower oil chamber formed below the core 4 via the oil passage 4g.

A rotating portion 34 of an operating lever L attached to the outside of the core 4 by appropriate means is adjacent to the protruding portion of the needle-shaped operating rod 31a connected to the valve body 31 to the outside of the core 4. . The rotating portion 34 is eccentrically mounted, and its rotation pushes the needle-shaped operating rod 31a into the core 4. That is, the valve body 3
1 from the opening of the oil passage 4e.
This is to move the inside of f backward.

Therefore, when there is pressure oil in the lower oil chamber formed below the core 4, when the lever L is operated, the lower oil chamber is filled with oil passages 4g, 4f, and 4e.
The oil in the lower oil chamber is discharged into the oil reservoir A, and the hydraulic strut contracts.

With the above structure, according to the present invention, the insertion body of the hydraulic strut or the strut as a single-acting hydraulic cylinder can be replaced with another insertion body of a different length, so that the use of the said strut can be improved. This means that the support can be of an optimal length depending on the location. In this case, it is sufficient to prepare only the insertion bodies of different lengths, and there is no need to prepare the entire support columns of different lengths, which has the advantage of being more economical. Also,
In order to optimize the length of the strut, it is sufficient to transport only the inserts of different lengths, so there is no need to transport the entire strut, which has the advantage of being more convenient.

Furthermore, when replacing the insertion body with another insertion body, it is sufficient to remove the pin that connects the piston, which has the advantage of simplifying the work.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing the support column according to the present invention, Fig. 2 is a longitudinal cross-sectional view partially showing the most extended state, and Fig. 3 is a longitudinal cross-sectional view showing the support column according to the present invention.
The figure is a cross-sectional view indicated by the middle line - in FIG. 1, and FIG. 4 is a partial longitudinal sectional view shown by the middle line - in FIG. 3. DESCRIPTION OF SYMBOLS 1... Regular length body, 2... Piston, 3... Insert body, 4... Core, 10... Pin, 20... Hydraulic pump, 27... Relief valve, 30... Release valve, A... Oil sump room, B...oil room.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A fixed length body having a hydraulic pump and a release valve, a piston slidably disposed within the fixed length body, and a fixed length body connected to the piston. an insertion body that is slidably inserted into the body, and is extended by the operation of the hydraulic pump,
Further, in the strut formed to be contracted by the operation of the release valve, the strut is formed so that the insertion body can be separated from the piston. (2) The strut according to claim 1, wherein the insertion body is formed so that it can be separated from the piston when the strut is fully extended. (3) The strut according to claim 1 of the utility model registration, in which the insertion body has a piston connected to the piston by a pin that passes through the insertion body and the piston.