JPH0636700U - Lifting device for hanging objects - Google Patents

Abstract

(57) [Summary] [Purpose] To control the movement and speed of a hanging object with a small amount of operating force and excellent operability, and with a manual feel. [Structure] A winch drum 1 for raising and lowering a suspended object, a hydraulic motor 2 for both forward and reverse rotations for rotating the winch drum, an input shaft rotation speed proportional type flow rate control unit B connected to the hydraulic motor via a circuit, The flow rate control unit is provided with a hydraulic pressure source O including a pump P and a tank T connected to the flow rate control unit via a circuit, and the flow rate control unit includes a switching control valve 5 that selectively connects a hydraulic motor to the pump or the tank. A switching control valve is added to the metering pump, and the input shafts 7 of the switching control valve and the metering pump 6 are manually steered to operate.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lifting device for hanging objects used for lifting lighting fixtures, curtains, etc. in theaters, halls, etc.

[0002]

[Prior art]

 In theaters, halls, etc., many hangings such as lighting fixtures, curtains, and audio equipment are hung from the ceiling and raised and lowered arbitrarily.

The lifting and lowering of the hanging object is carried out by hanging each hanging object on a large number of batons via wires and pulling up or down the wires, ropes, etc. connected to the batons manually or via winches. .

[0004]

[Problems to be solved by the device]

 In the case of manually raising and lowering the hanging object, the movement of the hanging object and the speed can be controlled directly by the movement of the hand, but there is a problem that the operation force is large and labor and skill are required.

On the other hand, when a wire or rope is wound up and down with a winch, the operation force is small and the operation can be performed remotely, but the movement and speed control of the hanging object is less sensitive than manual operation. There is.

[0006] Therefore, an object of the present invention is to provide a lifting device for a suspended object which has a small operation force and is excellent in operability and which can control the movement and speed of the suspended object with a manual feeling.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the configuration of the present invention comprises a winch drum for raising and lowering a suspended object, a hydraulic motor for forward and reverse measurement for rotating the winch drum, and an input shaft rotation speed connected to the hydraulic motor via a circuit. It is equipped with a proportional type flow rate control unit and a hydraulic pressure source consisting of a pump and a tank connected to this flow rate control unit via a circuit, and the flow rate control unit selectively connects a hydraulic motor to the pump or tank. It comprises a switching control valve and a metering pump added to the switching control valve. The input shafts of the switching control valve and the metering pump are manually steered to operate.

[0008]

[Action]

 When each input shaft is manually rotated via pulleys and ropes, the switching control valve switches to connect the hydraulic motor to the hydraulic power source, and pressure oil corresponding to the amount of rotation of the input shaft is measured by the metering pump. Is supplied to the hydraulic motor, and the suspended object is moved up and down to a height corresponding to the supplied pressure oil.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.

The lifting device for a suspended object includes a winch mechanism A, a flow rate control unit B of the input shaft rotation speed proportional type, and a hydraulic power source O including a pump P and a tank T.

The winch mechanism A includes a winch drum 1 for raising and lowering a suspended object such as a lighting fixture and a curtain by hanging a rope on a baton side, and a hydraulic motor 2 for rotationally driving the winch drum 1. Is equipped with.

The flow rate control unit B includes a switching control valve 5 and a metering pump 6 added to the switching control valve 5.

The switching control valve 5 has a left side position a for normal rotation, a neutral position b, and a position c for reverse rotation, and each position a, b, c is connected to a pump P and a tank T via circuits 8 and 9. Connected selectively.

The two circuits d and e provided in the metering cylinder 6 are selectively connected to any of the positions a, b and c, and the two circuits d and e are each position a of the switching control valve 5. Alternatively, it is selectively connected to the circuits 3 and 4 on the hydraulic motor 2 side via c.

That is, when the switching control valve 5 is in the neutral position b, the pressure oil is not supplied and the hydraulic motor 2 is stopped.

When the switching control valve 5 is switched to the left side position a, the pressure oil from the pump P is supplied to the hydraulic motor 2 via the circuit d-metering pump 6-circuit e-circuit 4 and driven to the forward rotation side. To do.

At this time, the amount of oil supplied to the hydraulic motor 2 is measured by the metering pump 6.

Return oil from the hydraulic motor 2 is returned to the tank T via the circuit 3-left position a-circuit 9.

When the switching control valve 5 is switched to the right side position c, the pressure oil from the pump P is supplied to the hydraulic motor 2 via the right side position c-circuit e-metering pump 6-circuit d-circuit 3. Then, the hydraulic motor 2 is rotated in the reverse direction, and the return oil at that time is returned to the tank T through the circuit 4-right position c-circuit 9.

When the hydraulic motor 2 rotates in the normal rotation side, the winch drum 1 rotates in the normal rotation side. For example, the hanging object is raised, and when it rotates in the reverse rotation side, the hanging object is lowered.

The switching control valve 5 and the metering pump 6 each have an input shaft 7. The input shaft 7 is connected to a pulley 11 via a shaft 10, and a rope 12 rotates between the pulley 11 and the sheave 13. It is freely erected, and when the rope 12 is manually rotated clockwise or counterclockwise, the shaft 10 and the input shaft 7 rotate in the same direction, and the input of the input shaft 7 causes the switching control valve 5 to move to the left and right positions a and b. , C or the neutral position b, and the pressure oil is measured by the metering pump 6 in proportion to the rotation speed of the input shaft, and the pressure oil according to the rotation amount is supplied to the hydraulic motor 2.

Therefore, the input shaft 7 can be steered by the manual pulling operation of the rope 12, and the movement, height and speed of the hanging object can be controlled as if it were a manual operation, and its operation force is small and it can be operated remotely. Become.

FIG. 2 shows another embodiment of the present invention in which a control valve 14 of a hydraulic motor is added to the lifting device of FIG.

The control valve 14 is provided with a solenoid switching control valve 15. The switching control valve 15 is connected to the hydraulic motor 2 via the circuits 18 and 19 and is connected to the hydraulic power source O via the circuits 16 and 17. .

In this embodiment, in the same way as the embodiment shown in FIG. 1, in addition to being able to raise and lower the suspended object manually, the control valve 14 can be switched by remote electric operation to directly drive the hydraulic motor 2. .

Other functions and effects are the same as those of the embodiment shown in FIG.

[0028]

[Effect of device]

 The present invention has the following effects.

1) Since the suspended object is moved up and down while the input of the flow rate control unit is steered by the input operation, the suspended object's movement, height and speed can be controlled with a feeling of hand movement, and the control is accurate and fine adjustment is possible. Is possible.

2) Since the hydraulic motor is used to raise and lower the suspended object, even if the input shaft is manually steered, its operating force is small, and labor can be reduced.

3) Since the flow rate control unit is of the input shaft rotation speed proportional type, pressure oil can be metered and supplied by the metering pump according to the rotation amount of the input shaft, and automatically by manual steering of the input shaft. A predetermined amount of pressure oil can be supplied to the pendulum, so that the lifting and lowering of the suspended object can be manually and accurately controlled.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an apparatus for lifting and lowering a suspended object according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of a lifting / lowering device according to another embodiment of the present invention.

[Explanation of symbols]

 1 winch drum 2 hydraulic motor 5 switching control valve 6 metering pump 7 input shaft B flow control unit O hydraulic power source P pump T tank

Claims (1)

[Scope of utility model registration request] 1. A winch drum for raising and lowering a suspended object, hydraulic motors for both forward and reverse rotations for rotating the winch drum, and an input shaft speed proportional flow rate control unit connected to the hydraulic motor via a circuit, A switching control valve for selectively connecting a hydraulic motor to the pump or the tank, and a switching control valve provided to the switching control valve, the hydraulic control comprising a pump and a hydraulic pressure source connected to the flow control unit via a circuit. And a metering pump that is operated, and manually operates the input shafts of the switching control valve and the metering pump to operate them.