JPH10129987A - Heavy article elevating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a worker to operate lightly by utilizing a hydraulic apparatus, so as to reduce the fatigue, in an elevating device of heavy article. SOLUTION: This elevating device is made possible to drive to rotate by a main pulley 5 hydraulic moter directly and coaxilly, or indirectly, in which the force of a worker 11 is made to operate an operation rope 12 to rotate a rotary type servo valve which is installed directly and coaxially or indirectly to the main pully 5. Since the hydraulic motor is rotated counterclockwise by rotating the rotary type servo valve counterclockwase, by rotating the servo valve by an operating liquid delivered from a hydraulic pressure source 31, a heavy article 1 can be moved up and down by driving and rotating the main pulley 5 by the hydraulic motor directly or indirectly. In this case, the operation to drive and rotate the rotary type servo valve is carried out by fixing an operation pulley 13 to the driving shaft of the rotary type servo valve, and operating the operation rope 12 hung on the operation pulley 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heavy lifting device.

[0002]

2. Description of the Related Art FIG. 5 is an explanatory view of a conventional heavy object lifting / lowering apparatus. In FIG. 5, the heavy object 51 is a wire rope.
A balance weight 57 is suspended from one end of the wire rope 52, and a balance weight 57 is suspended from the other end 57a of the wire rope 52.
Is hooked on the child pulley 53 and the main pulley 55 as shown. The child pulley 53 is rotatably mounted by a bearing 54 fixed to a beam of a building (not shown).
55 is also rotatably mounted by a bearing 56 similarly to the child pulley 53. One end of the heavy object 51 is connected to the balance weight 57 by a wire rope 52 to raise or lower the stop position as necessary.
The other end 57a of the balance weight 57 is attached to the lower end 57b of the balance weight 57 via the operation pulley 63 and the lower pulley 65. The operation pulley 63 is rotatably mounted by a bearing 64 fixed to a beam of a building (not shown) similarly to the child pulley 53. The lower pulley 65 is rotatably mounted by a bearing 66 fixed to a floor surface 70.

[0003] The operator 61 can lift the balance weight 57 by pulling the operation rope 62 in the direction of arrow P, and thus can move the heavy object 51 downward.
By lifting the rope 62 in the direction of arrow Q, the balance weight 57 is pulled down, so that the weight 51 can be moved upward.

[0004]

Although it is possible to move a heavy object in the vertical direction as described above, a considerable force is required for the operation due to the following two factors, and the fatigue of the operator is a problem. Has become. First, it is difficult to match the balance weight with the weight of heavy objects. As for the balance weight, several weights of about 10 kg are piled up to almost match the weight of a heavy object, but a weight difference of several kg usually occurs. Second, when the mounting position of the child pulley 53 and the main pulley 55 is considerably high, the wire rope becomes longer if the amount of movement of the heavy object in the vertical position is large. This weight shift may add to the first weight difference. It is an object of the present invention to provide a heavy lifting apparatus that can be operated lightly by an operator even when the difference in weight is large and does not cause much fatigue.

[0005]

According to the first aspect of the present invention, a heavy object is suspended at one end of a wire rope straddling both a main pulley and a child pulley, and the other end is substantially the same as the heavy object. The weight balance weight is hung, and the main pulley can be driven directly or indirectly by a hydraulic motor so that the operator's power can be directly coaxially or indirectly mounted on the main pulley. And a heavy object lifting / lowering device for operating an operation rope for rotating the object. According to a second aspect of the invention, a heavy object is suspended at one end of a wire rope straddling both a main pulley and a child pulley, and a balance weight having substantially the same weight as the heavy object is suspended at the other end. A driven pulley is provided above, a drive pulley is provided coaxially with a hydraulic motor provided on a separate shaft, and an auxiliary pulley and an operation pulley are provided coaxially with a rotary servo valve provided on a separate shaft. The pulley and the auxiliary pulley are linked to each other by straddling an annular wire rope, and the heavy object lifting / lowering device is configured to operate the operation rope applied to the operation pulley. According to a third aspect of the present invention, an operation rope is looped around the operation pulley described in the first and second aspects, a tension pulley is hung below the operation rope, and the tension pulley is connected to the floor plate via a spring. A heavy object lifting / lowering device that pulls or suspends an appropriate amount of weight.

[0006]

The present invention is configured as described above, and its operation will be described below. First, a case where a heavy object is to be unloaded will be described. When the operator pulls one side of the operation rope downward, the operation pulley rotates due to friction with the operation rope, and the rotary servo valve moves from the neutral position to the lowered position. Then, the hydraulic fluid pressurized by the hydraulic pump and sent through the pipe passes through the rotary servo valve and rotates the hydraulic motor in the same direction as the operation pulley. Since the output shaft of the hydraulic motor is fixed to the main pulley, the main pulley rotates simultaneously with the hydraulic motor in the same direction. Since the heavy object is connected to the balance weight by the wire rope, and the wire rope is hung on the main pulley, if the main pulley rotates, the wire rope moves in the direction of lowering the heavy object by the frictional force with the main pulley,
Therefore, the heavy object descends. If the operator stops pulling the operating rope, the hydraulic motor stops because the rotary servo valve returns to the neutral position, and thus the lowering of the heavy object stops.

Next, when the heavy object is raised, the operation pulley rotates in the opposite direction by pulling the operation rope downward on the opposite side to the above, so that the rotary servo valve is moved from the neutral position to the raised position. Since the hydraulic fluid is sent from the hydraulic pump to the hydraulic motor through a rotary servo valve, the hydraulic motor rotates in the opposite direction to the above, so that the main pulley is , The wire rope moves in the direction of lifting the heavy object, and therefore the heavy object rises. As for stopping the lifting of the heavy object, pulling the operation rope may be stopped in the same manner as when stopping the lowering.

Next, the operation of the second aspect of the invention will be described. A driven pulley provided coaxially with the main pulley,
A drive pulley, which is a motor on the same axis as a hydraulic motor provided on another axis, and an auxiliary pulley, which is provided on the same axis as a rotary servo valve provided on another axis, are straddled by an annular wire rope and interlocked. As such, the rotary servovalve is activated and the pressurized hydraulic fluid drives the hydraulic motor. This driving force drives the main pulley via a driven pulley from a driving pulley that is interlocked by an annular wire rope. The hydraulic circuit is exactly the same as that of the first aspect of the present invention, and the operation of the operation pulley and the operation of each device at the time of lifting and lowering of a heavy object are the same as those described above, and will not be described here.

The operation of the third aspect of the invention will be described. An operation rope on an operation pulley provided coaxially with the rotary servo valve rotates the rotary servo valve by friction with the operation pulley. Therefore, the operation rope is made annular, and a tension pulley is hung below, and the tension pulley is pulled from the floor surface via a spring, or an appropriate weight is hung on the tension pulley to apply a pulling force to the operation rope in advance. Thus, the frictional force between the operation rope and the operation pulley is maintained.

[0010]

Embodiments of the present invention will be described below. FIG. 1 is an explanatory diagram of the outline of the present invention. FIG.
, 1 is a heavy object, 3 is a child pulley, 5 is a main pulley,
7 is a balance weight, 2 is a wire rope, and the wire rope 2 is hung on the child pulley 3 and the main pulley 5,
One end of the wire rope 2 suspends the heavy object 1 and the other end suspends the balance weight 7. The child pulley 3 is rotatably attached to a child pulley bearing 4 fixed to a part of a beam of a building (not shown). The main pulley 5 will be described with reference to FIG. FIG. 2 is a cross-sectional view of the main pulley 5 and other structures as viewed in the direction of arrow A in FIG. In FIG. 2, the main pulley 5 is mounted on an output shaft 21b of a rotary servo valve 21 mounted on a bracket 6a fixed on the upper part of the mounting member 20, and on a bracket 6b fixed on the upper part of the mounting member 20. Output shaft of hydraulic motor 23
And 23a via keys 21c and 23b, respectively. An operation pulley 13 is attached to an input shaft 21a of the rotary servo 21 via a key 21b, and an operation rope 12 for operating the rotary servo valve 21 is hung on the operation pulley 13. Hydraulic pressure source
The operating force pressurized at 31 is supplied to the rotary servo valve 21 by piping 32.
And the return hydraulic fluid from the rotary servo valve 21
33 returns to the hydraulic pressure source 31. As shown in FIG. 2, 34 and 35 are pipes for connecting the rotary servo valve 21 and the hydraulic motor 23.

FIG. 3 is a hydraulic circuit diagram of each of the above-mentioned hydraulic equipment. 3, the hydraulic pressure source 31 includes a hydraulic pump 31b driven by an electric motor 31a, a hydraulic fluid tank 31c, a strainer 31d, a relief valve 31e, and the like. The rotary servo valve 21 is a servo valve that can be switched to three positions of L, M, and N. The pipe 36 exiting from the hydraulic motor 23 is a pipe for returning the drain liquid exiting from the hydraulic motor to the working tank 31c. In FIG. 1, the operation rope 12 is formed in an annular shape and a tension pulley 15 is hung below the operation rope 12.
Are pulled by the operation pulley 13 and the operation rope 12
And to maintain the frictional force with the

The present invention is configured as described above, and its operation will be described below. Now heavy 1
When the operator 11 pulls the operation rope 12 in the direction of arrow B, the operation pulley 13
And the rotary servo valve 21 moves from the neutral position N to L
And therefore pressurized by the hydraulic pump 31b
The hydraulic fluid sent by the above passes through the L position of the rotary servo valve 21 and rotates the hydraulic motor 23 through the pipe 34 in the same direction as the operation pulley 13. Since the output shaft 23a of the hydraulic motor 23 is fixed to the main pulley 5 by the key 23b, the main pulley 5 rotates simultaneously with the hydraulic motor 23 in the same direction. The heavy object 1 is connected to the balance weight 7 by the wire rope 2, and the wire rope 2 is hung on the main pulley 5. Therefore, when the main pulley 5 rotates, the wire rope 2 is moved by an arrow D due to frictional force with the main pulley 5. , The weight 1 therefore descends.

The hydraulic fluid whose pressure has been reduced by rotating the hydraulic motor 23 passes through the pipe 35 and further returns to the hydraulic fluid tank 31c of the hydraulic pressure source 31 via the pipe 33 via the L position of the rotary servo valve 21.
The drain liquid generated by the hydraulic motor 23 returns to the working fluid tank 31c via the pipe 36. When the operator 11 stops pulling the operation rope 12 in the direction of arrow B, the hydraulic motor 23 stops because the rotary servo valve 21 returns to the N position, and the lowering of the heavy object 1 also stops. Since the pulling force of the operation rope 12 is a force required for switching the rotary servo valve 21 via the operation pulley 13, the operation is extremely light and easy.

Next, when the heavy object 1 is raised, the operation pulley 13 is rotated in the opposite direction by pulling the operation rope 12 in the direction of arrow C, so that the rotary servo valve 21 is moved from the neutral position N to the M position. The hydraulic fluid sent from the hydraulic pump 31b by the pipe 32 passes through the M position of the rotary servo valve 21 and is sent to the hydraulic motor 23 through the pipe 35.
When the hydraulic motor 23 rotates in the opposite direction to the above, the main pulley 5 rotates in the same direction as the hydraulic motor 23, so that the wire rope 2 moves in the direction of arrow E, and the heavy object 1 rises. As for stopping the lifting of the heavy object 1,
It is sufficient to stop pulling the operation rope 12 in the C direction as in stopping the descent.

FIG. 4 is an explanatory diagram of another embodiment.
In FIG. 4, the hydraulic motor 23 and the rotary servo valve 21 are arranged separately from the main pulley 5, and the main pulley 5 is driven indirectly. A heavy object 1 suspended at both ends of a wire rope 2 straddling the main pulley 5 and the child pulley 3;
The balance weight 7 is as described above. The driving method of the main pulley 5 is as follows: the driven pulley 43 coaxially fixed to the main pulley 5, the driving pulley 42 coaxially fixed to the hydraulic motor 23, and the rotary servo valve 21. Auxiliary pulley 44 coaxially fixed
An annular wire rope 45 is straddled over the three pulleys, and the rotary servo valve 21 is further provided with another operation pulley 13.
And the operation rope 12 is hung on the operation pulley 13, and the operator 11 operates the operation rope 12 to raise or lower a heavy object.
The hydraulic circuit in this case is the same as that shown in FIG. The operation rope 12 is annular, and a tension pulley 15 is hung below the operation rope 12. A weight 17 is suspended from the tension pulley 15 by the operation pulley 13.
And to maintain a frictional force between the operating rope 12 and the operating rope 12.

When the operator 11 pulls the operation rope 12 in the direction of arrow S, the operation pulley 13 rotates clockwise, so that the rotary servo valve 21 switches to the position L in FIG. 3, and the hydraulic motor 23 moves clockwise. Since it rotates, the annular wire rope 45 similarly rotates the driven pulley 43 fixed to the main pulley 5 clockwise, so that the main pulley 5 also rotates clockwise at the same time, and is attached to one end of the wire rope 2 hung. The suspended heavy object 1 descends. Worker 11 operates rope 12
Is pulled in the direction of arrow U, the operation pulley rotates counterclockwise, and the rotary servo valve switches to the position M in FIG. 3, so that the heavy object 1 rises as can be determined in the above description. To stop the downward movement or the upward movement, the operator 11 may stop pulling the operation rope 12 as described above. As for the force for operation, the operation can be performed very lightly as described above. This configuration is suitable for use when the length T shown in FIG. 2 is too long to fit in the space to be accommodated.

[0017]

According to the present invention, a heavy object is suspended at one end of a wire rope straddling both a main pulley and a child pulley, and a balance having substantially the same weight as the heavy object is mounted at the other end. In a device that lifts and lowers a heavy object by hanging a weight and rotating a main pulley, the main pulley is rotated directly or indirectly by a hydraulic motor, and the hydraulic motor is rotated by a rotary servo valve installed on the same axis or a separate axis. Rotary servo valve is a heavy lifting device that controls the rotation of the main pulley by operating an operation rope that is applied to an operation pulley installed on the same axis or a separate axis, and that lifts and lowers heavy objects. . Therefore, a worker can lift and lower a heavy object only by operating the rotary servo valve using the operating rope with a light force. It is expensive.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an outline of the present invention.

FIG. 2 is a sectional view as seen in the direction of arrow A in FIG.

FIG. 3 is a hydraulic circuit diagram of the present invention.

FIG. 4 is an explanatory view of another embodiment of the present invention.

FIG. 5 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 1 Heavy load 2 Wire rope 3 Child pulley 5 Main pulley 7 Balance weight 11 Worker 12 Operation rope 13 Operation pulley 15 Tension pulley 16 Spring 17 Weight 19 Floor surface 21 Rotary servo valve 23 Hydraulic motor 42 Drive pulley 43 Follower pulley 44 Auxiliary Pulley 45 annular wire rope

Claims (3)

[Claims] 1. A heavy object is hung at one end of a wire rope straddling both a main pulley and a child pulley, a balance weight having substantially the same weight as the heavy object is hung at the other end, and the weight is obtained by rotating the main pulley. In a device that lifts and lowers an object, the main pulley is rotated directly or indirectly by a hydraulic motor, and the hydraulic motor controls rotation by a rotary servo valve installed on a coaxial or another shaft, and the rotary servo valve is coaxial or A heavy load elevating device that controls the rotation of the main pulley by operating an operation rope attached to an operation pulley installed on a separate shaft, and lifts and lowers heavy loads. 2. A driven pulley is provided coaxially with the main pulley, a drive pulley is provided coaxially with a hydraulic motor provided on a separate shaft, and an auxiliary pulley is provided coaxially with a rotary servo valve provided on a separate shaft. And an operation pulley, wherein the driven pulley, the driving pulley, and the auxiliary pulley are linked to each other by straddling an annular wire rope, and the operation rope applied to the operation pulley is operated. . 3. An operation rope is looped around an operation pulley provided coaxially with the rotary servo valve, and a tension pulley is hung below the operation rope, and the tension pulley is interposed between the tension pulley and a floor surface via a spring. 3. The heavy lifting device according to claim 1, wherein the friction between the operation pulley and the operation rope is maintained by pulling or suspending a weight.