JPH1179684A - Hand operation unit for hoist - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hand operation unit for a hoist which dispenses with any drive source for operation, provides a subtle descending speed control by regulating the flow of fluid moving by the weight of a hoisted article, has a simple constitution, and dispenses with any maintenance. SOLUTION: A hand operation unit is regulated and operated by a pressure compensated flow control valve 8 which is provided in a first flow path 7 communicating with both chambers 3a, 3b partitioned liquid-tightly by a piston 5 and operated externally so that the flow of the fluid moving from the compressed chamber 3a to the chamber 3b in a negative pressure side is subtly restricted so as to provide an appropriate and subtle descending speed and, when the load is released, the piston 5 introduces the fluid in the chamber 3b in the negative pressure side from a second flow conduit 10 to the chamber 3a in the compression side by the operation of a compression spring 11 so as to be returned to its original position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hand operation unit for a hoist, and more particularly, to adjusting the speed to a low speed just before landing an article lifted by the hoist at a fixed position to adjust the speed to an appropriate minute speed. The present invention relates to a hand operation unit of a hoist that can perform the operation.

[0002]

2. Description of the Related Art An electric hoist such as an electric chain block is
With a push button switch suspended from the main body side,
In the case of hoisting or lowering operation, the switch that operates by pressing the upper or lower command button controls the electromagnetic contactor and controls the drive motor to control the rotation direction and rotation speed of the drive motor. ing.

A double-speed electric chain block capable of operating at two different speeds, low speed and high speed, is a so-called double-winding type pole number converter in which the driving motor is provided with two types of windings having different numbers of poles. A low-speed and high-speed switching electromagnetic contactor is controlled by a switch which is operated by a first-stage push operation and a second-stage push operation of a two-stage motion (two-stage push) push button switch as an electric motor. The rotation speed of the electric motor is switched to change the hoisting and lowering speeds.

Further, a multi-stage variable speed electric chain block capable of performing a multi-stage or stepless speed change from a low speed to a high speed is provided with a speed command operation unit having a variable resistor in a push button switch box, and the variable resistor By operating the controller, a speed command signal is sent to the voltage control unit built in the main body of the chain block, the rotation speed is controlled by changing the voltage applied to the drive motor, and the hoisting and lowering speed can be set arbitrarily. I have to.

[0005] Of the three types of conventional electric chain blocks described above, the first general electric chain block is the most widely used at present. When landing on a pedestal or the like, it is customary to perform several jogging operations in order to avoid damage due to mutual collision.

[0006] However, such an inching operation requires skill and reduces the work efficiency, and has the disadvantage that the wear of each part including the electric contacts of the push button switch and the electric contacts is accelerated. ing.

Further, the double-speed electric chain block has a problem that it is difficult to cope with a delicate operation speed requirement because it is fixed to one of a low speed and a high speed. Further, the multi-stage variable speed electric chain block can be set to an arbitrary operation speed that is best according to the application, but has a problem that the configuration is not suitable for use by changing the speed during operation. Had.

[0008] For this reason, a small-sized suspending device has been proposed as an operating unit capable of easily performing a fine adjustment operation.
No. 6396 has been proposed. In this hand-operated hanging tool, the vertical movement speed characteristic of the hanging tool with respect to the rotation operation of the operation knob is determined by the resistance value change characteristic of the variable resistor with respect to the rotation amount of the operation knob, and the variable resistor includes a plurality of leads. By being configured by the resistance value change characteristics of the switch and the fixed resistor, it is possible to arbitrarily set the resistance value of each fixed resistor depending on the selection method.

[0009]

However, such a hoist using the hand-operated method is such that the electric motor for driving the hoist is finely adjusted by manual operation, but a power source is used as a drive operation source. The operation cable connected to the motor for driving the hoist is pulled down to hand,
A hanging cord is added together with a separately provided push button switch, and there is a problem that it cannot be used in the event of a power failure.Moreover, since various electric components such as various switches and drive mechanisms are used, complicated Therefore, there is a problem that maintenance of these various electrical components and the like and the drive mechanism becomes difficult.

According to the present invention, a minute descending speed can be obtained by adjusting the flow of the moving fluid by the weight of the article to be lifted without requiring a driving source for the operation, and the maintenance can be performed with a simple configuration. It is an object of the present invention to provide an easy-to-use operation unit for a hoist.

[0011]

In order to achieve the above object, a hand operating unit in a hoist of the present invention is interposed between a chain which is lifted and lowered by the hoist and a hanging hook. A hand operating unit, wherein the hand operating unit is provided with a first locking member provided at one end of a block body having a fluid chamber therein, and the fluid chamber is on the same line of action as the first locking member. A second piston provided at the other end of the block body and connected to a piston slidably fitted to
A locking member, a first flow path communicating with chambers on both sides partitioned by the piston in a liquid-tight manner, an externally operable flow control valve provided in the first flow path, and communication with the chambers on both sides A second flow path provided with a check valve so as to form a flow opposite to the first flow path, and a compression spring housed in the other chamber to press and urge the piston in one chamber. It is characterized by being done. Since the present invention has such a characteristic, it is controlled by an externally operable flow control valve provided in the first flow path which is communicated with the chambers on both sides which are liquid-tightly partitioned by the piston. The flow of the fluid moving from the closed chamber to the negative pressure side chamber is delicately narrowed to obtain an appropriate minute descending speed, and when the load is released, the piston immediately returns to the original position by the action of the compression spring be able to.

[0012] In the hand operating unit of the hoist of the present invention, the flow rate adjusting valve may change a cross section of a narrow groove formed on an outer periphery of the spool by a rotation operation from the outside to change a flow rate of the first flow path. It is preferable to be configured to adjust. By doing so, the flow rate is adjusted by changing the cross section of the narrow groove formed on the outer periphery of the spool by the rotation operation, so that it is possible to adjust the flow rate within at least one rotation, thereby expanding the adjustment range. Can be done.

The hand operating unit of the hoist of the present invention is characterized in that the flow control valve changes the cross section of a narrow groove formed on the outer periphery of the spool by a linear pressing operation from the outside. It is preferable that the flow rate is adjusted. By doing so, since the cross section of the narrow groove formed on the outer periphery of the spool is changed by the pressing operation in the linear direction, a reliable operation can be performed without erroneous operation.

[0014] In the hand operating unit of the hoist of the present invention, it is preferable that the first and second flow paths are formed in the block body. By doing this,
Since the first and second flow paths are formed inside the block body regardless of the piping, the operability is facilitated since the first and second flow paths are formed compact.

[0015] The hand operating unit of the hoist of the present invention is preferably configured such that the first flow path is provided with a throttle valve that can be externally operated before the flow control valve. In this way, since the first flow path incorporates an externally operable throttle valve in front of the flow control valve, the flow of the fluid can be properly adjusted even if the viscosity changes due to a change in the temperature of the fluid or the like. Is set,
It is possible to obtain a highly accurate minute speed.

In the hand operating unit of the hoist of the present invention, it is preferable that the second flow path is incorporated in the piston so as to communicate with the chambers on both sides. By doing so, the second flow path is incorporated into the piston so as to communicate with the chambers on both sides, so that the shape of the block body is further reduced in size to reduce the weight and improve operability.

The hand operating unit in the hoist of the present invention is a hand operating unit interposed between the chain that is moved up and down by the hoist and the hanging hook,
The hand operation unit includes a first locking member provided at one end of a block body having a fluid chamber therein, and is slidably inserted into the fluid chamber on the same line of action as the first locking member. A second locking member connected to the other end of the block body connected to the piston, and an opening for releasing air in one chamber of the fluid chamber airtightly partitioned by the piston to the atmosphere, A suction port provided in the other chamber and provided with a check valve that allows only the inflow of air, and a flow control valve provided in the other chamber and externally operable to adjust the exhaust flow rate in the other chamber are provided. It is characterized by comprising an exhaust port and a compression spring provided in the other chamber to press and urge the piston into one chamber. Since the present invention has such features and uses air as a compression medium, it is suitable for transporting relatively light transport articles, and the circuit configuration is simplified, so that the structure can be downsized.

The hand operating unit of the hoist according to the present invention is characterized in that the flow control valve is a wireless receiver electrically connected to the block body, and the wireless receiver controls the operation section of the flow control valve. The operation unit of the flow rate control valve is remotely operated by a transmitter provided separately from the block body. With this configuration, the operation unit of the flow rate control valve is remotely controlled, so that when the lifted article lands or is lifted to a place where no one can approach, a remote control can be performed to adjust the speed to a very low speed. .

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments and the drawings. First, FIG. 1 is a longitudinal sectional view of a hand operation unit of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is an operation circuit diagram of the hand operation unit.

Reference numeral 1 denotes a hand operation unit as a first embodiment. The hand operation unit 1 is interposed between a chain which is moved up and down by a hoist (not shown) and a hanging hook. A first locking member 4 rotatably supported via a thrust bearing 12 at one end of a block body 3 provided with a fluid chamber 2 therein, and on the same line of action as the first locking member 4. A hook 6 is connected to a piston 5 slidably inserted into the fluid chamber 2 and is provided at the other end of the block body 3 as a second locking member, and an O-ring 13 is mounted on the outer periphery. An externally operable flow regulating valve 8 provided in a first flow path 7 which is communicated with chambers 3a and 3b on both sides which are liquid-tightly partitioned by a piston 5;
A second flow path 10 provided with a check valve 9 for communicating with the first flow path 7 and forming a flow opposite to the first flow path 7; and a second flow path 10 for pressing the piston 5 toward one chamber 3b. And a compression coil spring 11 housed therein.

More specifically, the hook 6 is connected to the lower end of the piston rod 14 of the piston 5, and the piston rod 14 is connected to the lid 1 attached to the lower end of the block 3.
5 is guided by a bush 17 made of a material having low sliding resistance, which is sealed in a liquid-tight manner via an O-ring 16 mounted on the cover 5 and fitted on the outside of the lid 15.

Next, the flow regulating valve 8 is configured to be rotatable, and the cross section of the narrow groove 19 having a V-shaped cross section formed on the outer periphery of the spool 18 is changed by an external turning operation by the handle H. Thus, the flow rate of the first flow path 7 is adjusted.

The narrow groove 19 of the spool 18 is spirally formed on the outer periphery of the spool 18 within a predetermined range with a predetermined lead. 19, and a throttle valve 20 that can be externally operated is incorporated in the first flow path 7 in front of the flow control valve 8.

It should be noted that the flow control valve 8 is connected to the spool 1 described above.
An example has been described in which a narrow groove 19 having a V-shaped cross section is formed on the outer periphery of 8 and the cross section is changed by turning or moving straight to adjust the flow rate of the first flow path 7. The type in which the flow angle is adjusted by adjusting the moving angle may be used, and the present invention is not limited to this configuration.

Next, the operation of the hand operation unit will be described. In the hand operation unit shown in FIG. 3, the lower end of the chain 21 of the hoisting machine main body H attached to the beam B or the like is suspended by the first stopper 4. By operating the push button switch 23 suspended from the main body of the hoist via the cable 22, for example, the article W on the floor surface or the surface plate P is suspended by the hook 6 and lifted to a predetermined height.

In order to prevent the piston 5 from being lowered against the compression spring 11 due to the load of the article W locked by the hook 6 during the lifting operation, the flow control valve 8 is set to a blocked state. deep. Therefore, in this state, since the piston 5 does not move, the oil as the fluid in the lower chamber 3a defined by the piston 5 is not flown.

Then, when the article W locked on the hook 6 is further wound up by the hoisting machine by the operation of the push button switch 23 and is carried to a predetermined position, the article W again moves down and descends to just before the platen P. Then, the handle H of the flow control valve 8 is rotated to gradually release the spool 19 from the blocking state. By this opening, the fluid in the lower chamber 3a on the compression side is compressed by the load of the article W and starts to flow, and the lowering speed of the article W is finely adjusted by adjusting the flow rate by the flow rate adjusting valve 8.

As described above, the flow rate is adjusted by changing the cross section of the narrow groove 19 formed on the outer periphery of the spool 18 by the turning operation, so that the flow rate can be adjusted within at least one rotation, so that the fine adjustment range can be obtained. Can be enlarged.

Here, by adjusting the throttle valve 20 in advance and setting an appropriate predetermined flow rate, even if the viscosity changes due to a change in the oil temperature or the like, the flow of the oil is appropriately set, and the accuracy is improved. A high minute flow rate can be obtained, and a minute downward moving speed of the article can be obtained. In this manner, the lifted article W is placed on the surface plate P at an appropriate decelerated minute descending speed, so that the article W and the surface plate P can be quietly and accurately placed without damaging the article W or the surface plate P. Can be placed.

Next, when the article W placed on the surface plate P is detached from the hook 6, the load of the piston 5 in the fluid chamber is released and the piston 5 in the fluid chamber moves upward by the return elastic force of the compression coil spring 11, The hydraulic pressure in the upper chamber 3b which has been on the negative pressure side flows down through the second flow path 10 via the check valve 9 and is introduced into the lower chamber 3a. As a result, the piston 5 in the fluid chamber is automatically returned to the original raised position. If an accumulator (not shown), for example, is connected to the port P of the second flow path 10, even if oil leakage occurs due to long-term use and the amount of oil decreases, the pressure is constantly replenished and the pressure in the fluid chamber is increased. Because it is guaranteed, reliability is improved and it is safe.

As described above, the first flow path 7 communicated with the chambers 3a and 3b on both sides which are partitioned by the piston 5 in a liquid-tight manner.
Is controlled by the flow control valve 8 which can be operated externally, so that the flow of the fluid moving from the compressed chamber into the chamber 3a on the negative pressure side can be finely restricted to obtain an appropriate minute speed, When the load is released, the piston can immediately return to the original position by the action of the compression spring 11.

Next, as a modified example of the flow control valve, the flow control valve changes the cross section of the narrow groove formed on the outer circumference of the spool by a linear pressing operation from the outside, thereby changing the first flow path 7.
It is preferable that the flow rate is adjusted. By doing so, since the cross section of the narrow groove formed on the outer periphery of the spool is changed by the pressing operation in the linear direction, a reliable operation can be performed without erroneous operation.

It is preferable that a check valve 9 is incorporated in the piston 5 so that the second flow path communicates with the chambers 3a and 3b on both sides. By doing so, the second flow path is incorporated into the piston 5 so as to communicate with the chambers 3a and 3b on both sides, so that the size of the block body 3 is further reduced, so that the weight is reduced and the operability is improved. Is improved.

Next, a second embodiment of the hand operation unit will be described. That is, the hand operation unit of the present embodiment uses a gas (air) instead of a fluid as the compression medium, and has almost the same configuration as that of the above embodiment, but has a partly different circuit configuration. Therefore, FIGS. 1 and 3
This embodiment will be described using the same reference numerals.

The hand operation unit 1 includes a first locking member 4 provided at one end of a block body having a fluid chamber therein, and a sliding member which is on the same line of action as the first locking member 4 and slides into the fluid chamber. A second locking member 6 connected to the movably inserted piston 5 and provided at the other end of the block body 3; and one of the fluid chambers 3 hermetically partitioned by the piston 5
b, an opening (to be described later) for opening the air in the chamber b to the atmosphere, an inlet (to be described later) provided with a check valve 9 provided in the other chamber 3a to allow only the inflow of the atmosphere, and the other chamber 3a
An exhaust port (to be described later) provided with a flow rate adjusting valve 8 which is provided in the other chamber 3 and which can be externally operated to adjust the exhaust flow rate in the other chamber 3a.
And a compression spring 11 provided in the other chamber 3a to press and urge the piston 5 against the one chamber 3b.

That is, the first embodiment of the first embodiment
The one chamber 3b of the flow path 7 is separated from the flow control valve 8 to form an open port communicating with the atmosphere in the one chamber 3b, and the outlet side of the flow control valve 8 is configured as an exhaust port. The chamber 3b of the two flow paths 10 is separated from the check valve 9 so that the air side of the check valve 9 is used as a suction port.

With this configuration, the hook 6
When the article W is locked and pulled up, the flow control valve 8 is kept in a block state. When the article W is transported to a predetermined position and then lowered to a predetermined height, the flow control valve 8 is stopped.
Is gradually released, the article W locked by the hook 6 is lowered at a slow speed of the descending layer, which is slowed down slowly, and is gently placed at a fixed position.

Next, when the article W is detached from the hook 6, the piston 5 is restored to the original position by the urging force of the compression spring 11. At this time, the air in one chamber 3b is exhausted to the atmosphere through the opening, and at the same time, the air is sucked into the other chamber 3a from the atmosphere via the check valve 9. With this configuration, since air is used as the compression medium, it is suitable for transporting a relatively lightweight conveyed article, and the circuit configuration is simplified, so that the structure can be downsized.

Further, in the hand operation unit according to the third embodiment, the flow control valve 8 includes a wireless receiver (not shown) electrically connected to the block body 3 and an operation unit of the flow control valve 8 by the wireless receiver. It is preferable that a rotation drive mechanism for controlling the rotation of the block body 3 is provided, and the operation unit of the flow rate control valve 8 is remotely controlled by a transmitter provided separately from the block body 3.

By doing so, the flow control valve 8
Is remotely controlled, so that the suspended article W
When landing or hoisting on a place where no one can approach, a remote operation can be used to adjust the speed to a very low speed.

[0041]

The present invention has the following effects.

(A) According to the first aspect of the present invention, the adjusting operation is performed by the externally operable flow control valve provided in the first flow path which is communicated with the chambers on both sides which are liquid-tightly partitioned by the piston. Therefore, the flow of the fluid moving from the compressed chamber to the negative pressure side chamber is finely restricted, and an appropriate minute descending speed can be obtained.When the load is released, the piston immediately returns to the original state by the action of the compression spring. Can return to position.

(B) According to the invention of claim 2, since the flow rate is adjusted by changing the cross section of the narrow groove formed on the outer periphery of the spool by the turning operation, the flow rate is adjusted within at least one rotation. Therefore, the fine adjustment range can be expanded.

(C) According to the third aspect of the present invention, the cross section of the narrow groove formed on the outer periphery of the spool is changed by the pressing operation in the linear direction, so that there is no erroneous operation in operation. Operations can be performed.

(D) According to the fourth aspect of the present invention, the first and second flow paths are formed inside the block body regardless of the piping, so that the structure is compact and the operability is facilitated.

(E) According to the invention of claim 5, since the first flow path incorporates an externally operable throttle valve in front of the flow control valve, the viscosity changes due to a change in the temperature of the fluid or the like. However, the flow of the fluid can be set appropriately.

(F) According to the sixth aspect of the present invention, since the second flow path is incorporated in the piston so as to communicate with the chambers on both sides, the shape of the block body is further reduced to reduce the weight. Operability is improved.

(G) According to the seventh aspect of the present invention, since air is used as the compression medium, it is suitable for transporting relatively light articles, and the circuit configuration is simplified, so that the structure can be downsized. .

(H) According to the eighth aspect of the present invention, since the operation section of the flow control valve is remotely controlled, when the lifted article lands or is lifted to a place where no one can approach, the remote control can be used to slightly reduce the height. Speed can be adjusted.

[0050]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a hand operation unit as one embodiment of a hand operation unit of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an operation circuit diagram of the hand operation unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hand operation unit 2 Fluid chamber 3 Block body 3a, 3b chamber 4 1st latching tool 5 Piston 6 Hook (2nd latching tool) 7 1st flow path 8 Flow control valve 9 Check valve 10 2nd flow path 11 Compression Coil spring 18 Spool 19 Narrow groove 20 Throttle valve W Article

Claims (8)

[Claims] 1. A hand operation unit interposed between a chain moved up and down by a hoist and a hanging hook, wherein the hand operation unit is provided at one end of a block body having a fluid chamber therein. A first locking member provided, and a piston provided on the other end of the block body connected to a piston which is on the same line of action as the first locking member and is slidably inserted into the fluid chamber. A second locking member, a first flow path communicating with both chambers liquid-tightly partitioned by the piston, an externally operable flow control valve provided in the first flow path, and the two chambers A second flow path provided with a check valve to form a flow opposite to the first flow path, and a compression spring housed in the other chamber for urging the piston toward one chamber. A hand operation unit in a hoist, comprising: 2. The flow rate control valve is configured to adjust a flow rate of the first flow path by changing a cross section of a narrow groove formed on an outer periphery of a spool by a rotation operation from the outside. 2. A hand operation unit in the hoist according to 1. 3. The flow control valve is configured to adjust a flow rate of the first flow path by changing a cross section of a narrow groove formed on an outer periphery of a spool by a linear pressing operation from outside. A hand operation unit in the hoist according to claim 1. 4. The hand-operated operation unit according to claim 1, wherein the first and second flow paths are formed in the block body. 5. The hand-operated operation unit of the hoist according to claim 1, wherein the first flow path has an externally operable throttle valve incorporated in front of the flow control valve. 6. The hand-operated operation unit in the hoist according to claim 1, wherein the second flow path is incorporated in a piston so as to communicate with the chambers on both sides. 7. A hand operation unit interposed between a chain moved up and down by a hoist and a hanging hook, wherein the hand operation unit is provided at one end of a block body having a fluid chamber therein. A first locking member provided, and a piston provided on the other end of the block body connected to a piston which is on the same line of action as the first locking member and is slidably inserted into the fluid chamber. A second locking member, an opening for releasing air in one chamber of the fluid chamber air-tightly partitioned by the piston to the atmosphere, and a check valve provided in the other chamber for allowing only the inflow of the atmosphere. A suction port provided in the other chamber, a discharge port provided with a flow control valve which can be externally operated to adjust the flow rate of exhaust gas in the other chamber, and the other port for pressing and biasing the piston to one chamber. And a compression spring installed inside the room. Hand operation unit in hoist, characterized in Rukoto. 8. The flow control valve, further comprising: a wireless receiver electrically connected to the block body, and a rotation drive mechanism that controls rotation of an operation unit of the flow control valve by the wireless receiver. The hand-operated operation unit of the hoist according to any one of claims 1 to 3, wherein an operation unit of the flow control valve is remotely operated by a transmitter provided separately from the block body.