JPS641399B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure oil injection device with improved operability.

Generally, when injecting high oil pressure into hydraulic equipment, for example when injecting oil into hydraulic columns used at construction sites, a pressure oil injection device as shown in Figure 1 is conventionally used. was.

That is, in the figure, reference numeral 1 denotes a hydraulic cylinder-type column that is supplied with pressure oil inside and expands; 2 is an injection device that supplies pressure oil to the pressure oil supply port 1a of this column 1; It has a connecting portion 3 that fits into the oil supply port 1a, and a hose 4 connected to a hydraulic power source is connected to the other end. As shown in FIGS. 2A and 2B, the connecting portion 3 has a connecting device 5 that fits into the flange 1b of the pressure oil supply port 1a. By engaging and connecting the two, and moving the coupler 5 upward from the state shown in the figure, the engaging portion 6 is disengaged from the flange 1b and the connection between the two is released. The injection device 2 has a ball valve 9 in the middle of an oil passage 7 formed in the main body, which opens and closes the passage 7 by rotating a lever 8, and a screw 10 is tightened at a downstream position from this ball valve 9. The structure includes a pressure relief part 11 that releases the passage 7 to the outside by loosening the pressure release part 11.

Therefore, in a conventional injection operation using this injection device 2, the injection device 2 is connected to the pressure oil supply port 1a at the connection part 3, and then the lever 8 is operated to open the ball valve 9 and pressure is supplied through the passage 7. The operability until oil is supplied is relatively good, but the operability when closing the ball valve 9 and removing the injection device 2 from the pressure oil supply port 1b is poor. That is, if the ball valve 9 is simply closed, the flange 1b of the pressure oil supply port 1a and the engaging portion 6 of the coupler 5 will come into contact with each other due to the hydraulic pressure remaining in the passage 7, and the frictional force will cause The above-mentioned disengagement operation (upward movement) of the coupler 5 requires an extremely large amount of force, but in the past, before the coupler 5 is released, the pressure release part 11 is operated to remove a little oil from the passage 7 and the hydraulic pressure is reduced. The contact force is reduced by reducing the contact force.

However, in order to operate this pressure relief part 11, it is necessary to operate it with both hands due to its structure, which causes the problem that the operability of the injection device is extremely poor when one-handed operation is required at a construction site or the like. It was hot.

The purpose of the present invention is to enable the opening/closing of a pressure oil passage and the release of residual pressure in response to a single lever operation, thereby making it possible to easily perform the operations of injecting pressure oil, stopping injection, and releasing pressure with one hand. It is an object of the present invention to provide an injection device capable of improving pressurized oil injection operability.

To achieve the above object, the present invention provides a pressure oil injection device that removably connects a pressure oil source and hydraulic equipment, in which a small diameter bore and a large diameter bore are connected in series in the middle of a passage formed inside the main body. A poppet valve is housed in the large diameter bore such that one end of the poppet valve comes into contact with and separates from a valve seat formed at the opening edge of the small diameter bore with the large diameter bore to open and close the passage, and the poppet valve is held by a spring. At the same time, a piston-shaped protrusion provided at the other end is slidably fitted into a fitting hole formed on the back side of the large diameter bore, and the cross-sectional area of this protrusion is While setting the seat area to be approximately the same as the seat area of the valve seat, the small diameter end of the poppet valve extending toward the small diameter bore side is connected to a lever via a piston, and the poppet valve is pushed back against a spring by operating the lever to open the passage. A communication hole is formed in a part of the poppet valve so that the connecting portion side of the passage with the hydraulic equipment can be connected to the pressure relief hole, and the communication hole and the pressure relief hole are connected to the piston. The connection is made by moving the poppet valve in the closing direction.

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 3 shows a pressure oil injection device 20 of the present invention.
In the figure, reference numeral 21 denotes a pistol-shaped body, in which a pressure oil passage 22 is formed from the bottom of the stock to the muzzle, and an opening 23 at the bottom of the stock serves as a hose connection to a pressure oil source (not shown). Connect the connected hose 4. Further, the muzzle 24 constitutes a connecting portion 25 together with a connecting device 5' similar to that shown in FIG.

Reference numeral 6' denotes an engaging portion of the coupler, which engages with the flange 1b of the pressure oil supply port 1a of the hydraulic equipment shown by the imaginary line in the figure to connect the two.

A valve mechanism 26 is actuated by a lever 27 corresponding to a trigger, and has coaxial bores 28 and 29 of a small diameter and a large diameter formed perpendicular to the passage 22. And these bores 28, 29
A poppet valve 30 is installed inside, and its conical surface 30a
By bringing the valve into contact with the valve seat 31, the passage 2
The spring 32 is biased to cut off the communication between the small diameter bore 28, which is always in communication with the downstream side of the main body 2, and the large diameter bore 29, which is always in communication with the upstream side. poppet valve 3
A communication hole 33 is formed at the tip of the small diameter side of the hole 3, and the tip opening 28 of the small diameter bore 28 is passed through the communication hole 33.
A is made to communicate with the passage 22 downstream of the poppet valve. On the other hand, the tip opening 2 of the small diameter bore 28
A piston 35 having a sealing material 34 integrally formed on its back surface is slidably installed inside the piston 8a, and its front surface is brought into contact with the inner surface of the base of the lever 27. Therefore, as the lever 27 rotates around the fulcrum 37, the piston 35
is moved in the left-right direction in the figure, and especially when moved to the right, the sealing material 34 comes into pressure contact with the edge of the small-diameter bore opening 28a and closes the small-diameter bore 28.
36 is a pressure relief hole bored in the small diameter bore opening 28a.

It goes without saying that this injection device is formed to a size that allows a person to operate it with one hand.

After operating the coupler 5' to connect the connection part 25 to the pressure oil supply port 1a as before, pull the lever 27, that is, rotate it to the right in the figure, and the piston 3
5 is moved to the right, and poppet valve 30 is further moved to the right against spring 32. As a result, the conical surface 3
0a is located away from the valve seat 31 and the passage 22 is connected to the bore 28,
29, and the pressure oil from the hose 4 is injected from the muzzle side into the pressure oil supply port 1a. At this time, since the piston 35 presses the sealing material 34 against the opening edge of the small diameter bore 28, the oil flows into the pressure relief hole 3.
There is no leakage from 6. In this state, lever 27
It is carried out within the range of A to B.

By the way, as shown in the figure, the poppet valve 30 is provided with a piston-shaped protrusion 39 having a cross-sectional area approximately the same as the seat area of the valve seat 31 on the back side, and this protrusion 39 is formed on the back side of the bore 29. By freely slidingly fitting into the fitted fitting hole 40,
The oil passage 22 is
Since the high-pressure oil from the poppet valve 30 is restricted in the force that urges the poppet valve 30 in the valve closing direction, and the seat areas of the protrusion 39 and the valve seat 31 are approximately the same, the large diameter bore The hydraulic pressure acting on the valve 29 is canceled out so as not to bias the poppet valve 30 in either the opening or closing direction, and therefore, in order to open the poppet valve 30, the lever 27 can be moved only against the spring 29. It is sufficient to operate it with a moderate amount of force.

In order to make the protrusion 39 slide smoothly in the fitting hole 40, the space of the fitting hole 40 may be communicated with the tank side or the atmosphere.

If you loosen the lever 27 after injection, the spring 3
The poppet valve 30 moves to the left due to the two forces and the differential pressure caused by the area difference between the left and right sides of the poppet valve 30, and the conical surface 3 is moved again.
0a comes into pressure contact with the valve seat 31 to close the passage 22 and stop the supply of pressure oil. At this time, lever 2
7 moves back to position A in the figure.

When attempting to disconnect the connecting portion 25 in this state, if the grip on the lever 27 is further loosened, the pressure within the passage 22 will act on the right side of the piston 35, causing the piston 35 to move to the left (lever 27).
7 moves to position C in the figure), the sealing material 34 is separated from the opening edge of the small diameter bore 28. As a result, passage 2
The second downstream side communicates with the opening 28a through the small diameter bore 28 and the communication hole 33, and further communicates with the pressure relief hole 36 to drain the oil to the outside and reduce the pressure inside the passage.

Therefore, the pressing force between the engaging portion 6' of the coupler 5' and the flange 1b in the coupler 25 is almost eliminated, and the release operation of the coupler 5' can be performed extremely easily.

It should be noted that, although the present invention device is most suitable for a pistol type as shown in the drawing, it goes without saying that the device is not limited to this structure.

As described above, the present invention provides a pressure oil injection device that removably connects a pressure oil source and a hydraulic device, in which a small diameter bore and a large diameter bore are formed in series in the middle of a passage formed inside the main body. A poppet valve is housed in the large diameter bore such that one end of the poppet valve comes into contact with and separates from a valve seat formed at the opening edge of the small diameter bore with the large diameter bore to open and close the passage, and the poppet valve is closed by a spring. At the same time, a piston-shaped protrusion provided at the other end is slidably fitted into a fitting hole formed on the back side of the large diameter bore, and the cross-sectional area of this protrusion is set to the valve seat. The narrow diameter end of the poppet valve extending toward the small diameter bore side is connected to a lever via a piston, and the passage is opened by pushing back the poppet valve against a spring by operating the lever. A communication hole is formed in a part of the poppet valve to connect the connecting portion side of the passage with the hydraulic equipment to the pressure relief hole, and the communication hole and the pressure relief hole are connected to the poppet of the piston. Since the valve is configured to connect when the valve is moved in the closing direction, it is possible to supply pressure oil and release pressure at the same time just by operating the lever.Moreover, it cancels out the hydraulic pressure applied to the poppet valve in the opening and closing direction. As a result, the opening/closing operation force can be reduced as much as possible, and as a result, it has become possible to easily inject pressure oil into hydraulic equipment with one hand.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram for explaining the injection device, FIG. 2A is a sectional view of a conventional injection device, FIG. 2B is a view taken in the direction of the arrow in FIG. 2A, and FIG. 3 is an injection device of the present invention. FIG. 1... Prop (hydraulic equipment), 1a... Pressure oil supply port,
4...Hose, 5,5'...Connector, 20...Injection device, 22...Oil passage, 25...Connection part, 27
... Lever, 28, 29 ... Bore, 30 ... Poppet valve, 32 ... Spring, 33 ... Communication hole,
34... Seal material, 35... Piston, 36...
Pressure release hole, 39... protrusion, 40... fitting hole.

Claims (1)

[Claims] 1 In a pressure oil injection device that removably connects a pressure oil source and hydraulic equipment, a small diameter bore and a large diameter bore are formed in series in the middle of a passage formed inside the main body, and the small diameter bore and the large diameter bore are connected to each other. A poppet valve is housed in the large-diameter bore so that one end of the poppet valve comes into contact with and separates from a valve seat formed at the opening edge of the valve to open and close the passage, and the poppet valve is biased in the valve closing direction by a spring, and A piston-shaped protrusion provided at the other end is slidably fitted into a fitting hole formed on the back side of the large diameter bore, and the cross-sectional area of this protrusion is made approximately the same as the seat area of the valve seat. While setting, the small diameter tip of the poppet valve extending toward the small diameter bore side is connected to a lever via a piston, and the passage is opened by pushing back the poppet valve against a spring by operating the lever, A communication hole is formed in a part of the poppet valve so that the connecting portion of the passage with the hydraulic equipment can be connected to the pressure relief hole, and the communication hole and the pressure relief hole are connected to each other when the piston moves in the poppet valve closing direction. A pressure oil injection device characterized in that it is configured to be connected by.