JPH0742079B2 - Fluid control device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention relates to fluid control devices, and more particularly to
The present invention relates to a fluid control device that instantly detects the weight of a load body and immediately puts the load body in a zero-gravity state to freely move the load body with a slight force of an operator.

[0002]

2. Description of the Related Art A fluid control device which instantly detects the weight of a load body and immediately puts the load body in a non-gravity state to freely move the load body with a slight force of an operator is disclosed in, for example, Japanese Patent Application Laid-Open No. Sho 62-62. As disclosed in JP-201797-A,
A cylinder having a piston coupled to the output transmission body, and a first volume having a constant volume, to which a load or an external force is applied and which is continuously provided.
A box having a chamber and a second chamber having a variable volume;
A fluid supply path for supplying fluid to the chamber from a fluid pressure source,
A fluid inlet / outlet path connecting the second chamber and the cylinder port of the cylinder is engaged with the box to which a load or an external force is applied so as to be relatively movable in the load direction, and A load transfer body having a fluid discharge passage communicating with two chambers; an elastic member that gives the piston a force commensurate with the total weight of the load transfer body, the output transfer body, and the box; the first chamber of the box; Second
A first fluid passage and a second fluid passage that are respectively provided between the first fluid passage and the second fluid passage and between the second fluid passage and the second fluid passage, A controller having a closed state when no external force is applied, and a valve configured to operate in a different state when the load or external force is applied.

The structure of a fluid control device using such a cylinder and a controller is as shown in FIG. 3, in which 21 is a cylinder, 11 is a piston, and 3 is a cylinder.
3 is a cylinder rod, 28a and 28b are rollers, 2
2 is a wire, 34 is a controller, 1 is a load body (work), 23 is an air hose that connects an air supply source (not shown) to the controller 34, and 20 is the controller 34 and the cylinder port 29 of the cylinder 21. An air hose 27 is a control lever provided on the controller 34.

[0004]

SUMMARY OF THE INVENTION The above-described fluid control device is capable of easily hoisting and hoisting a work weight of 50 kg or 100 kg with a small load (hand, finger, etc.) above or below the control lever 27. Can be lowered. Then, if you release your hand from the control lever 27,
The cylinder output and work weight are in a balanced state and cannot move up or down. Therefore, when the load body is moved up and down according to the worker's intention, a human being controls the lever 27.
You have to move up and down, but the control lever 27
Is provided in the controller 34 located above the load body 1, so that when the load body 1 as a suspended load is tall, the control lever 27 comes to the top of the load body 1 and Often out of reach, making work impossible.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate these problems and to provide a fluid control device which allows an operator to control at a low position separated from the controller even when the load is tall. To do.

[0006]

The structure of the present invention taken to solve the above problems is as follows.

(1) A cylinder having a piston connected to an output transmission body, a box having a first chamber of constant volume and a second chamber of variable volume, which are connected to each other when a load or an external force is applied, and the first chamber. A fluid supply path for supplying a fluid from a fluid pressure source to the second chamber and a fluid inlet / outlet path connecting the second chamber and the cylinder port of the cylinder, in the load direction with respect to the box to which a load or an external force is applied. A load transmission body having a fluid discharge passage that is relatively movably engaged and communicates with the second chamber of the box, and a force corresponding to the total weight of the load transmission body, the output transmission body, and the box. Elastic members, first and second fluid passages respectively provided between the first chamber and the second chamber of the box and between the second chamber and the fluid discharge passage, Both Is configured to close the first and second fluid passages when the load or the external force is not applied, and to operate in different states when the load or the external force is applied. In a fluid control device having a controller including a valve, the weight of the load body is instantly detected, and the load body is immediately brought into a weightless state to freely move the load body with a slight force of an operator. By-pass fluid connecting a down valve formed of a three-way valve provided between the fluid inlet side of the controller and the fluid supply path, and an outlet side of the controller and an upstream side of the down valve of the fluid supply path A passage, a rising valve formed of a two-way valve provided in the bypass fluid passage, and a push button for operating the lowering valve and the rising valve, and a movable valve that is movable to a position separated from the controller. It is characterized in that it has an operation means.

(2) In (1), the load transmitting body includes a case connected to the output transmitting body, the box is mounted in the case so as to be movable in the load direction, and the second chamber is It is characterized in that it has a partition wall made of an elastic body, which is opposed to a receiver provided in the case and is provided with a valve seat of the valve.

(3) In (1) or (2), the above 3
The one-way valve is a switching valve for switching between a flow passage connecting the fluid inlet side of the controller and the fluid pressure generation source and a flow passage opening the fluid inlet side of the controller via a throttle valve, and the two-way valve Is a switching valve for connecting and disconnecting the bypass flow passage.

[0010]

In the fluid control device of the present invention, a down valve consisting of a three-way valve is provided between the fluid inlet side of the controller and the fluid supply side, and an outlet side of the controller and an upstream side of the down valve of the fluid supply path are provided. A bypass fluid passage having an ascending valve formed of a two-way valve is provided, and a remote control means having a push button for operating the descending valve and the ascending valve and movable to a position separated from the controller is provided. Therefore, since the worker can put the push buttons for operating the descending valve and the ascending valve at hand, even if the height of the load body is high and the position of the controller is too high to reach the operator,
Work can be carried out. That is, the controller can be operated regardless of the height of the load body.

[0011]

EXAMPLES Examples will be described below.

FIG. 1 is an explanatory view of the essential parts of an embodiment of the fluid control device of the present invention, and FIG. 2 is an explanatory view of the essential parts of FIG. In these figures, 1 is a load body, 2 and 3 are air passages, 4 is a box, 5 is a valve, 6 is a partition wall, 7 is a receiver, 8 is a case, 9
Is a spring receiver, 10 is a push load adjusting screw, 11 is a piston, 12 is an air inlet, 13 is an air inlet and outlet, 14
Is a suspender, 15 is an air passage, 16 is a spring, 17 is the ground, 18 is a first chamber, 19 is a second chamber, 20 is an air hose, 21 is an air cylinder, 22 is an output transmitter, and 23
Is an air hose, 24 is an accumulator, 25 is a pressure reducing valve, 26 is a hole, 28 is a roller, 29 and 30 are cylinder ports, 31 is a spring, 32 is a guide partition wall, 33 is a cylinder rod, 34 is a controller, and 35 is a controller. Is a three-way down valve, 35a is a push button for switching the air passage of the down valve 35, 36 is a throttle valve provided in the air discharge passage of the down valve 35, and 37 is the outlet side of the controller 34 and air supply A bypass air passage connecting the upstream side of the descending valve 35 of the passage 23, and 38 a bypass air passage 37.
The reference numeral 38a designates a push-up button for switching the air passage of the riser valve 38, and the reference numeral 39 designates a throttle valve provided in the bypass air passage 37.

In FIG. 2, the mounting position of the control lever provided in the conventional fluid control device is shown by a dotted line 27 '.

A case 8 is connected to the tip of the piston 11 via a rigid body which is an output transmission body 22 or a flexible object, and the box 4 is mounted inside by a method in which the box 4 can freely move in the load direction. Has been. Box 4
Has an air inlet 12, a valve 5, an air passage 2, an air inlet / outlet 13, and an airtightly sealed and stretchable partition wall 6 made of, for example, a rubber plate, and are continuously connected through the air passage 2. The first chamber 18 having a constant volume and the second chamber 1 having a variable volume
9 and is joined to the load body 1 via the suspending tool 14. The partition wall 6 is fixed to the box 4 at the peripheral portion, a valve seat for the valve 5 is provided at the central portion, and the valve seat is fixed to the case 8 via the receiver 7. The valve 5 is held through a guide partition 38 which has a through hole for the valve 5 at the center and is provided around the hole for air passage. When the valve tip portion is directed upward or horizontally due to the positional relationship between the valve 5 and the air passage 3, the spring 16 is provided to smoothly move the valve 5.
Is provided. The spring 32 is a spring that pushes the box 4 in the load direction with a constant pressure. By interposing the spring 32, the cylinder for the load such as the output transmitter 22 and the case 8 and the load transmitter mainly including the receiver 7 is provided. The output can be secured at all times. The spring receiver 9 and the push load adjusting push screw 10 are provided to adjust the pressure of the spring 32, and are provided as necessary. Also, receive 7
An air passage 15 for exhausting air is provided in the chamber, and the atmospheric pressure is opened through a hole 26 provided in the case 8.

Therefore, when the load body 1 is in contact with the ground 17, that is, when the load amount is 0, the load applied to the box 4 is only the box 4 and the hanger 14, and the load corresponding to the load amount. Has directional force. However, since the valve 5 is received by the case 8 via the receiver 7, its movement in the load direction is restricted. Therefore, the air passage 2 is opened, the pressure air waiting in the first chamber 18 flows into the second chamber 19 through the air inlet 12, and the air hose 2
After passing through 0, it flows into the designated port on the piston side or the head side of the cylinder 21, and at the same time, the bulkhead 6 and the receiving 7
And acts on the case 8 via. This indicates that the thrust generated by the piston 11 and the thrust in the counter load direction generated by the box 4 via the partition wall 6 are in a proportional relationship. When the proportional state is entered, the box 4 rises and the air passage 2 is closed.
At this time, a thrust force proportional to the pressure acts on the cylinder 21 in the anti-load direction. If the pressure receiving areas of the piston 11 and the partition wall 6 are the same here, in the device for transmitting the force relationship of 1: 1 according to the principle of pulley or the principle of lever, the case 8 of the case 8 is output via the output transmission body 22. The counter load direction force and the counter load direction force of the box 4 match. This is one of the proportional output relationships, and when it is desired to change the force relationship, the pressure receiving area may be changed by the principle of the pulley or lever. This proportional force relationship indicates that the load of the load body 1 is 10
The same applies when 0% occurs, that is, when it is off the ground.

The operation when a small external force in the anti-load direction is applied to the case 8 is as described below. The minute counter-load direction force applied to the case 8 generates thrust in the counter-load direction on the piston, and the ability to increase the internal volume of the cylinder is generated according to the thrust. This is transmitted to the partition wall 6 at the same time as the ability to reduce the cylinder internal pressure. Therefore, the ability of the box 4 to move in the load direction is generated. However, the total gravity of the box 4, the suspending tool 14, and the load body 1 acts on the box 4, and the cylinder 21 under the above-mentioned constant load relationship.
Tries to return to the output proportional relationship between the box 4 and the box 4. If this minute force is continuously applied to the case 8, the load body 1 can be continuously raised. When it is necessary to lower the load body 1, the output operation proportional to the reverse path is performed by the reverse operation. Next, from the time when the load body 1 starts grounding until it is completed, that is,
The process of the load weight changing from 100% to 0% or floating from the ground, that is, 0 to 100% is the differential operation of the above-mentioned load body ascending / descending principle,
It can be easily analogized and proved by experiments.

Due to the structural characteristics of the controller 34, when the load body is moved from a high place to a low place,
By carrying out the cargo handling work, the air energy is increased, and in the case of cargo handling work between places of the same height,
The amount of energy required for continuous operation is almost zero. This is provided with an accumulator 24 and a pressure reducing valve 25 in the middle of a pipe 23 connected to the air inlet 12, and the pressure reducing valve 25 is set to a pressure at which the output of the piston 11 becomes equal to the maximum load that can be applied to the output transmission body 22. Should be adjusted.

In the conventional fluid control system shown in FIG. 3, when the grip 27 provided on the case 8 is operated in the opposite load direction, the load body 1 floats as described above, and when the handle 27 is operated in the load direction, it becomes the second load. The pressure in the chamber 19 becomes equal to or higher than the pressure in the first chamber 18, the valve 5 rises against the minute output spring 16, and the air passage 2 is opened. On the other hand, the air passage 3 is returned to the accumulator 24 via the air passage 2 in the cylinder 21 in order to maintain the closed state due to the pressure difference between the second chamber 19 and the air passage 15.

On the other hand, in this embodiment, the above operation is performed by the remote operation means. The operation of the remote control means will be described below.

When the remote control means is in a state in which neither the push button 35a of the down valve 35 nor the push button 38a of the up valve 38 is pushed, the air passage is the same as that of the fluid control device of FIG. The load 1 is kept in a balanced state as when no force is applied to 27.

The operator has a lowering valve 35 of the remote control means at hand.
When the push button 35a of is pressed, the air passage is switched, the air hose 23 is shut off, the air of the controller 34 flows back and is exhausted from the throttle valve 36, the balance state is broken, and the load body 1 descends. The descending speed at this time is determined by the throttle degree of the throttle valve 36.

When the push button 35a of the descending valve 35 is returned to its original state and the push button 38a of the ascending valve 38 is pushed in the normal balance state, the bypass air passage 37 branched from the air hose 23 does not pass through the controller 34. Unadjusted air is supplied to the air hose 20 side on the outlet side of the controller 34 through the throttle valve 39, the pressure on the air hose 20 side rises, the output of the cylinder 21 increases, and the load body 1 rises.

That is, since the operator can put the push buttons for operating the descending valve and the ascending valve at his or her hand, even if the operator is out of reach of the operator because the loader is tall and the position of the controller is high. It can be carried out and the controller can be operated regardless of the height of the load body.

[0024]

[Effects of the Invention] The present invention, even when the load is tall,
It is possible to provide a fluid control device that can be controlled by an operator at a low position apart from the controller, which has a great industrial effect.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of a fluid control device of the present invention.

FIG. 2 is an explanatory diagram of a main part of FIG.

FIG. 3 is an explanatory diagram of a conventional fluid control device.

[Explanation of symbols]

11 ... Piston, 21 ... Air cylinder, 22 ... Output transmitter, 23 ... Air hose, 29 ... Cylinder port, 33 ... Cylinder rod, 34 ... Controller,
35 ... down valve, 36, 39 ... throttle valve, 37 ... bypass air passage, 38 ... up valve, 35a, 38a ... (for air passage switching) push button.

Claims (3)

[Claims] 1. A cylinder having a piston coupled to an output transmission body, a box having a first chamber of constant volume and a second chamber of variable volume, which are connected to each other when a load or an external force is applied, and a box having the second chamber. A fluid supply path for supplying a fluid from a fluid pressure source, a fluid inlet / outlet path connecting the second chamber and the cylinder port of the cylinder, and a relative direction in the load direction with respect to the box to which a load or an external force is applied. Load transfer member having a fluid discharge passage communicating with the second chamber of the box, and a force commensurate with the total weight of the load transfer member, the output transfer member and the box, applied to the piston. An elastic member for giving the first of the box
Chambers and the second chamber, and first and second fluid passages respectively provided between the second chamber and the fluid discharge passage, and both ends thereof are the first and second fluid passages. The passage is closed when the load or the external force is not applied, and has a controller including a valve configured to operate in a different state when the load or the external force is applied, and A fluid control device for instantly detecting the weight of a load body and immediately moving the load body to a weightless state to allow the load body to move freely with a slight force of an operator, the fluid inlet side of the controller and the fluid supply A descending valve formed of a three-way valve provided between the controller and a bypass fluid passage connecting the outlet side of the controller and the upstream side of the descending valve of the fluid supply passage, and the bypass fluid passage. From a certain two-way valve That the increase valve, the fluid control apparatus characterized by comprising a remote control means which is movable in a position spaced from said controller has a push button for operating said lowering valve and the rise valve. 2. The load transmitting body includes a case connected to the output transmitting body, the box is mounted in the case so as to be movable in a load direction, and the second chamber is provided in the case. 2. The fluid control device according to claim 1, further comprising a partition wall made of an elastic body, which is opposed to the receiving tray and is provided with a valve seat of the valve. 3. A switching valve for switching between a flow path connecting the fluid inlet side of the controller and the fluid pressure generating source with the three-way valve and a flow path opening the fluid inlet side of the controller via a throttle valve. And the two-way valve is a switching valve that connects and disconnects the bypass flow path.
The fluid control device described.