JPH03166200A - Load transshipping device - Google Patents

Abstract

PURPOSE:To eliminate the danger due to malfunction by providing a bypass passage connected through a limiting check valve capable of being opened only in the direction of a fluid coming-in and out passage to a cylinder between the working fluid passage of a load-body fixing device and the fluid coming-in and out passage of a fluid control device. CONSTITUTION:A load-body 6 is hanged on a sucking pad 25 by a vacuum generating device 24. Air from a pressure regulating valve 12 is branched before it enters a fluid control device 7, and led from a selector valve 26 to a vacuum generating device 24. Further, the air is branched to a bypass passage 30 before it enters the vacuum generating device 24, and led through a limiting check valve 27 to the cylinder port 5 of a cylinder 1. When the selector valve 26 is shut-off due to malfunction during the operation of hanging, the pressure in a pipe 30 is reduced, and the air in a pipe 14' flows through the check valve 27 into the vacuum generating device 24. Resultant pressure reduction in the pipe 14' is detected by the control device 7, and only the required amount of air is supplied to the pipe 14'. Sucking force of the vacuum pad 25 is thus maintained to prevent danger.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a load transfer device, in particular, to instantaneously detect the weight of a load body and immediately bring the load body into a weightless state without using a slight force from an operator. The present invention relates to a load transfer device having a fluid control device for freely moving the load body.

[Conventional technology]

A conventionally used load transfer device includes a cylinder, a fluid control device, and a load chucking device. Figure 3 shows, for example, the applicant's application for JP-A-62-
This is an explanatory diagram of the cylinder 1 and the fluid control device for the load M8' device disclosed in the 201797-% publication, in which the fluid control device 7 is suspended by the sheave 2 and the piston 3 of the cylinder 1.
mounted between the output transmission body 4 and the load body 6 coupled to the
ing.

The fluid control device 7 includes a box 11 having a first chamber 8 with a constant volume and a movable partition wall 9 and a second chamber 10 with a variable volume, which are connected via a fluid passage to which a load or an external force is applied. 8. Pressure from the fluid pressure source! I! i A double fluid supply path 13 that supplies 0 (fluid) through the regulating valve 12, a fluid mountain inlet path 14 that connects the second chamber 10 and the cylinder port 5 of the cylinder 1, and a box to which a load or external force is applied. 1l
It is engaged so as to be movable relative to the load direction. having a fluid discharge passage 15 communicating with the second chamber 10 of the box 11;
A load transmitting body consisting of a receiver 16a and a case 16b, and a total ff of the load transmitting body, the output transmitting body, and the box 11.
between the elastic member 17 that applies a force corresponding to ifl to the piston 3 and the first chamber 8 and second chamber 10 of the box 11 and the second
The first and second fluid passages 18 and 19 are respectively provided between the chamber 10 and the fluid discharge passage IIft15, and both ends of the first and second fluid passages 18 and 19 are connected to the first and second fluid passages 18 and 19, respectively, when a load or an external force is applied. A valve 20 is configured to operate in a closed state when it is bent, and operates in a different state when a load or external force is applied, and a fluid discharge passage 2l provided in the case 16b and communicating with the fluid discharge passage g15. , it is possible to instantly detect the ffl amount of the load body 6 and immediately bring the load body into a zero gravity state and move the waiting heavy body to Mt. Hakusan with a slight force applied by the operator to the grip 22. This is what we mean. In order to fix the load body 6 at this load area 8''3A position, the load body 6 must be placed between the hanger 23 integrated with the box 11 and the load body 6, and the load secured to the hanger 23 must be A body chucking device (not shown in FIG. 3, similar to the embodiment of FIG. 2) was used.

[Problem to be solved by the invention]

However, in the conventional technology described in J.2, when lifting a load using a cylinder of a 5-fluid control device, the switching valve for the cylinder (9J) and the switching valve for the load body chucking device (9J) are separated from each other. Therefore, there was a high risk of the load falling or flying up due to incorrect operation of the switching valve.

An object of the present invention is to provide a load transfer device that can eliminate the risk of such erroneous operation.

[Means to solve the problem]

The configuration of the present invention taken to solve the above-mentioned problems is as follows: (1) A load or external force is applied, and the chamber has a first chamber with a constant volume and a second chamber with a variable volume, which are connected via a fluid passage. a fluid supply passage that supplies fluid from a fluid pressure source to the first chamber; a fluid inlet/outlet passage that connects the second chamber and the cylinder port of the cylinder; a load transmitting body that is movably engaged with the box in the direction of the load and has a fluid discharge passage communicating with the second chamber of the box; an elastic member that applies a force commensurate with the total weight to the piston; and a first elastic member provided between the first chamber and the second chamber of the box and between the second chamber and the fluid discharge passage. and second
The first and second fluid passages are in a closed state when the load or external force is not applied, and in different states when the load or external force is applied. a fluid control device which is connected to the piston of the cylinder via an output transmission body; and a load body fixing device which is mounted on a hanging device connected to the box and is operated by fluid pressure. In the load transfer device, a bypass connects the working fluid flow path of the load body fixing device and the fluid inlet/outlet path of the fluid control device via a limited check valve that opens only in the direction of the fluid inlet/outlet path. A flow path is provided.

(2) In (1), the limited check valve is a limited check valve having operating pressure adjusting means.

(3) In (1) or (2), the bypass path is
This flow path is branched from a fluid supply path that supplies fluid from a fluid pressure generation source of the fluid control device and is connected to the load body fixing device via a switching bowl.

(4) In (1) or (2), the load body fixing device includes a suction pad for adsorbing the load and an air ejector type vacuum generating device operated by air pressure; d.

In (5H1) or (2), the cargo holding device comprises a chucking device for gripping the load body and an air cylinder for operating the chucking device.

It is characterized by this.

[Effect]

The load transfer device of the present invention has a bypass flow path connected between the working fluid flow path of the load body fixing device and the fluid inlet/outlet path of the fluid control device via a limited check bowl that opens only in the direction of the fluid inlet/outlet path. Therefore, as long as there is internal pressure in the cylinder,
In other words, unless the capacity of this load transfer device disappears, for example, the air ejector-type vacuum generator and the air cylinder for operating the chucking device will not open, which will prevent heavy objects from falling and the air ejector and chucking device operating. It is possible to prevent the product from popping up, completely eliminating the risk of incorrect operation. [Example] Examples will be described below. FIG. 1 is an explanatory diagram of an embodiment of the load transfer device of the present invention.
Fluid control system! The configuration of 17 is the same as that in Figure 3, so it has been omitted. The same parts in Figure 1 as in Figure 3 are given the same numbers. Parts that use expressions different from those in Figure 3 are given the same symbols with a dash ('). In FIG. 1, reference numeral 24 indicates an air ejector type r [vacuum generating device] mounted on the hanging tool 23, 25 indicates a suction pad operated by the vacuum generator 24, 26 indicates a switching well, and 27
28 is a limited check well, 28 is a silencer, and 6a is a load on the floor.

Then, the pressure is regulated by the pressure regulating valve 12, and the pipe 1
The air supplied through 3' is branched before flowing into the fluid control device 7, and communicates with the vacuum generator 24 through a pipe 29 and a switching valve 26. Furthermore, the pipe 30 further branches before entering the vacuum generator 24, and is connected to a pipe 14' connected to the cylinder port 5 side of the cylinder 1 via a pipe 30 and a limited check valve 27. Air flowing into the vacuum generator 24 is discharged into the atmosphere via a pipe 31 and a silencer 28.

By the load transfer device of this embodiment, when lifting any load body 6 below the rating, the pipe 13' and the pipe 1
When comparing the air pressures of pipe 13', the internal pressure of pipe 13' is higher than or the same as that of pipe 14', and cannot be lower than that of pipe 14'. Therefore, when the switching valve 26 is in the human state, air flows from the top of the pipe 3' through the fluid control device ii"t7 to the pipe 14', and from the pipe 13' through the switching well 26 to the vacuum generator. 24 to perform vacuum generation work.

At this time, the air flowing in the direction of the pipe 3o is stopped from flowing into the cylinder 1 side by the limiting check valve 27. This means that the internal pressure of the pipe 14' is equal to or lower than the internal pressure of the pipe 13', and the limited check no.
This action is due to the spring 27a built into the spring 27a. Therefore, there is no pressure effect on the cylinder port 5 side. On the other hand, if the switching valve 26 is accidentally turned off during lifting work, the pressure on the pipe 30 side will drop. Limited check J at this time? Spring 27 built into 27
If a is relatively weak, the air in the vibrator 14' passes through the limiting checker 27 and flows into the vacuum generator Y124 from the pipe 30 to perform vacuum generation work. Therefore, the pressure inside the pipe 14' tends to decrease, but this decreasing tendency is detected by the fluid system 94 device 7, and air is automatically supplied to the pipe 14' only when necessary through the fluid control device 7. This required basin is the same as the amount lost by the vacuum generator 24. Therefore, the lifting capacity of the cylinder (■) does not decrease, and the suction force of the suction bat 25 is also maintained. If a downward operating force is continued to be applied to the fluid control device 7, the force will tend to decrease the internal volume within the cylinder 1 via the wire 4'. The pressure in the pipe 14' tends to rise, but when the switch J}26 is off, the air pressure is passed through the limited check valve 27 to the silencer 28.
It is then released into the atmosphere. When the switching valve 26 is a human body, the pressure is regulated within the fluid control device 7, and excess energy is released from the wandering hole 21.

Lower the load by ml. If the switching well 2r) is cut after the wire 4' has completely landed and the tension on the wire 4' is gone, the internal pressure of the vibrator 14' will be close to 0, and the limit check if. 2
7 cannot be pushed away, the supply of air to the vacuum generator 24 drops (II) 1, and the suction pad 25 stops its suction action on the load body 6. Also. While lifting, leave the switching valve 26 in the OFF state,
When lowering the load body 6 to land, use the limited check valve 2.
7 and is consumed by the vacuum generator 24, while at the same time the fluid control device f! ! It is also released into the atmosphere from the exhaust hole 21 of No. 7,
The load body 6 descends while maintaining a balanced state. After landing, the load gradually transfers from the cylinder side to the floor, but the cylinder's carrying capacity decreases accordingly. This is because the internal pressure of the vibrator 14' becomes lower than the force of the spring 27a in the limited change valve 27, and the spring 27a prevents the pressure from flowing to the real generator 2!24 side. Therefore, by changing the force of the spring 27a incorporated in the limit checker 27, the lower limit pressure for operation of the vacuum generator gi24 is set. This limited check i? -2
The pressure that can be blocked by the force of the spring 27a assembled in the cylinder 1 remains in the cylinder 1, and becomes the tension of the wire 4', so the spring 2
The force of 7a is applied to the total f of the constantly suspended suspensions 1 (fluid control device 7, vacuum generator 24, suction bat 25, etc.)
f! By incorporating a force less than or equal to l. When the suction bag 1-25 is separated from the load body G, no jumping phenomenon occurs.

Figure 2 is an explanatory diagram of another embodiment, in which a chucking station using an air cylinder is used as the load body fixing device. In Figure 2, the same parts as in Figures 1 and 3 are given the same reference numerals, but parts that use different expressions in Figure 2 than in Figure 3 are given the same numbers with a dash ('). A code is attached. In Fig. 2. 32.32a is a load body. 33 is a piston 33a, a spring 33b, and a cylinder port 33c.
34 is a chucking device;
5 is a three-way switching valve, and 36 and 37 are pipes. 2
Reference numeral 7b indicates a spring pressure adjustment screw provided on the limit check valve 27.

In the load transfer device of this embodiment, a load body 32 is chucked and lifted by a chucking device 34 using an air cylinder 33, and the structure of the air cylinder 33 is such that it is returned to its original state by a spring 33b. During normal lifting, the pipe 36, 3-way switching valve 3
S, the air passing through the pipe 37 is sent to the air cylinder 33
However, when the 3-way switching well 35 is turned off, air passes through the limited check valve 27 to the 3-way switching valve 3.
5 into the atmosphere, and at the same time the internal pressure of the cylinder l is guaranteed by the fluid control device 7.

This flow continues until the air in the fluid control device 7 is blocked by the load body 32 landing on the floor surface, and the internal pressure of the pipe 14' is blocked by the spring 27a in the limit check valve 27.

When the load body 32 completely lands on the ground and the tension on the wire 4 is removed, the air pressure within the pipe 14' decreases to near O.

This air pressure acts on the air cylinder 33,
When the piston 33a is defeated by the biasing force of the spring 33b built into the air cylinder 33, the piston 33a moves and the chucking device 34 becomes open.

This means that the chucking device 34 will not open as long as there is internal pressure in the cylinder 1, that is, unless the capacity of this load transfer device disappears, preventing the load body 32 from falling and the chucking device 34 from jumping up. It means being able to work. At this time, the total weight of the air cylinder 33, chucking device 34, etc. suspended from the lower part of the fluid control device 7 differs because they are individually packed according to various loads.

Since the lowest pipe internal pressure corresponding to this condition is set by the force of the spring 27a built into the limited check valve 27, it is effective to provide the spring 27a with a spring pressure adjusting screw 27b.

In the embodiment shown in FIG. 1, the working fluid of the load body fixing device is branched from the fluid supplied from the fluid pressure generation source of the fluid control device, and in the embodiment shown in FIG. Although a fluid pressure generation source different from the fluid pressure generation source is used, these are appropriately selected depending on the weight of the load body.

〔Effect of the invention〕

The load transfer device of the present invention has a fluid control device that instantly detects the weight of the load object and immediately puts the load object into a zero gravity state and moves the load object freely with a small amount of force from the operator. This makes it possible to eliminate the risk of erroneous operation in replacement equipment, and has great industrial effects.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of different embodiments of the load transfer device of the present invention, and FIG. 3 is an explanatory diagram of a conventional load transfer device.

Claims (1)

[Claims] 1. A box to which a load or external force is applied and which has a first chamber with a constant volume and a second chamber with a variable volume that are connected via a fluid passage, and a fluid pressure generation source in the first chamber. a fluid supply path that supplies more fluid; a fluid inlet/outlet path that connects the second chamber and the cylinder port of the cylinder; and a fluid inlet/outlet path that connects the second chamber and the cylinder port of the cylinder, and is movable relative to the box to which a load or external force is applied in the direction of the load. a load transmitting body having a fluid discharge passageway that engages with the box and communicates with the second chamber of the box;
an elastic member that applies a force to the piston corresponding to the total weight of the output transmitting body and the box; and between the first chamber and the second chamber of the box and between the second chamber and the fluid discharge passage. The first and second fluid passages are respectively provided in the first and second fluid passages, and both ends of the first and second fluid passages are closed when the load or external force is not applied. If a fluid control device is connected to the piston of the cylinder via an output transmitting body, the valves are configured to operate in different states, and the suspension device is connected to the box. In a load transfer device having a load body fixing device that operates with fluid pressure, the operation fluid flow path of the load body fixing device and the fluid inlet/outlet path of the fluid control device is connected only in the direction of the fluid inlet/outlet path. A load transfer device characterized by being provided with a bypass flow path connected via a limited check valve that opens. 2. The load transfer device according to claim 1, wherein the limiting check valve is a limiting check valve having operating pressure regulating means. 3. The bypass flow path is a flow path that branches from a fluid supply path that supplies fluid from a fluid pressure generation source of the fluid control device and connects to the load body fixing device via a switching valve. The load transfer device according to item 1 or 2. 4. Claim 1 or 2, wherein the load body fixing device comprises a suction pad for adsorbing the load body and an air ejector type vacuum generator operated by air pressure.
Load transfer device as described in section. 5. The load transfer device according to claim 1 or 2, wherein the load body fixing device comprises a chucking device for gripping the load body and an air cylinder for operating the chucking device.