JPS58130896A - Operating device for hoisting winch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hoisting winch operating device having a clutch and a brake.

First, the conventional hoisting quinch operating device is shown in Figures 1 to 4.
This will be explained using figures. As shown in FIG. 1, one end of the brake band 2 relative to the ζζ brake drum 1 is supported by a fulcrum part 3 through a pin, and the other end is connected to one end of a lever 5 supported by a fulcrum part 4 through a pin. There is. A tension spring 20 is connected to the end of the lever 5 on the brake band 2 side, and a tension spring 20 is connected to the end of the lever 5 on the brake band 2 side.
The long hole 6a of the push rod 17 is connected to the other end by a pin 27, and the long hole 17a of the push rod 17 is connected to the other end by a pin 28. The second rod 6 is provided with a variable pressure reducing valve 7.

The end of the second rod 6 on the side opposite to the elongated hole is fitted into a hole provided in the first rod 11, and the first rod 11 is connected to the fulcrum part 1.
The foot pedal 12 is connected to one end of the foot pedal 12 supported by the foot pedal 3 via a pin. A tension spring 21 is connected to the foot pedal 12 to pull the support toward the stand 14 side. A link 8 is supported by a pin 29 on the arm portion 11a provided on the first rod 11, a spring rod 9 is connected to one end of the link 8, and the other end of the link 8 is connected to the variable pressure reducing valve 7. , the middle part is connected to the middle part of the second rod 6 by a pin 30. A compression spring 10 is attached between the spring bearing portion of the spring rod 9 and the spring bearing portion provided on the first rod 11.

A compression spring 19 is attached between the spring receiver provided on the push rod 17 and the fixed spring receiver 18, and the end of the push rod 17 on the side opposite to the elongated hole is connected to the cylinder fulcrum s16.
(hereinafter referred to as the brake cylinder)
15. The brake cylinder 15 is connected to a pressure source (for example, a hydraulic pump) 22 and a tank 31 via piping and a variable pressure reducing valve 7, receives pressure by the operation of the variable pressure reducing valve 7, and expands in the direction in which the compression spring 19 can be assembled. do. The compression spring 19 acts in the direction of contracting the brake cylinder 15, that is, in the direction of tightening the brake band 2.

FIG. 1 shows a state in which the brake is released.

When the foot pedal 12 is depressed from this state, the second rod 6 and link 8 maintain the initial brake release state until the force exerted by the first rod 11 can counteract the initial force of the compression spring 10. , the lever 5 swings in the direction that tightens the brake band 2 (counterclockwise). At this time, as shown in FIG. 2, the variable pressure reducing valve 7 installed on the second rod 6 is pushed to the end of its stroke. Therefore, the pressure from the pressure source 22 acts on the brake cylinder 15, causing the compression spring 19 to contract, and the spring force of the compression spring 19 is not transmitted to the lever 5 by the long hole 17H of the push rod 17. Therefore, the spring force of the compression spring 19 is not transmitted to the lever 5. ,
Until this state continues, only the force due to the pedal force of the foot pedal 12 serves as the braking force. .

Furthermore, the foot pedal 12 is depressed, and the first rod 11
When the force increases from the initial spring force of the compression spring 10, the compression spring 10 is compressed via the link 8 and the spring rod 9 to a spring force equal to the force, and the first rod 11 is linked with the second rod 6. 8, the variable pressure reducing valve 7 extends, the cylinder 15 is connected to the tank 31, and the pressure in the brake cylinder 15 is increased to the balanced pressure. descend. This causes the compression spring 19 to expand, which increases the spring force and the brake cylinder 1.
5 is transmitted to the lever 5. Therefore, the braking force is the sum of the braking force commensurate with the pedal effort and the braking force commensurate with the spring force of the compression spring 19 at that time.

If the foot pedal 12 is further depressed to reduce the compression spring 10 and extend the variable pressure reducing valve 7, the variable pressure reducing valve 7 will finally open fully and the brake cylinder 15 will open as shown in FIG.
The pressure becomes zero. Therefore, all of the spring force of the compression spring 19 is transmitted to the lever 5, and the braking force reaches the maximum braking force.

That is, from the prekine operating point to the switching point of valve 7, a braking force commensurate with the depression force of the foot pedal 12 is obtained, and from the switching point of valve 7 to the maximum depression point, the braking force and compression due to the depression force are obtained. The sum of the braking force due to the spring force of 19 is obtained, and a large braking force is obtained. Since the foot pedal 12 and the brake band 2 are connected by a rod, a link, and a lever, the feel of the brake operation is also transmitted to the driver, allowing him to perform fine brake operations. Furthermore, even if a situation arises in which power cannot be transmitted due to a failure of the prime mover or the like during the first hoisting operation, the pressure in the hydraulic pump 22 also disappears and the brake cylinder 15 is contracted. A brake is applied by the spring force of the compression spring 19 to prevent the suspended load from falling. In addition, in the figure,
44a is a compression spring that applies force to the side that releases the clutch of the hoisting winch, and 44 is a cylinder (hereinafter referred to as clutch cylinder) that connects the clutch of the hoisting quinte by supplying pressure oil.
It is.

Such a compression spring 19, cylinder 15, variable melt pressure valve 7
A conventional hoisting quinte operating device that utilizes an automatic brake such as the above as a negative brake is constructed as shown in FIG. In FIG. 5, 36 is a hydraulic motor that drives the hoisting winch, 32 is a hydraulic pump that is the hydraulic source thereof, and 37 is a hydraulically operated type provided in the pressure oil supply/discharge path from the hydraulic pump 32 to the hydraulic motor 36. The main circuit switching valve 38 is a switching valve for operating the main circuit switching valve, and when the operating lever 388 is operated to the right or left in the rotation direction, the oil discharged from the operating hydraulic pump 22 is transferred to the operating circuit 33. or 33
' is supplied to the right or left operation boat of the main circuit switching valve 37 to switch the main circuit switching valve 37 and move the hydraulic motor 36 in the hoisting or hoisting (power lowering) direction. Aya.

40 is a switching valve for clutch operation, which is inserted between the clutch cylinder 44 and the discharge side pipe line 34 of the hydraulic pump 22. 42 indicates when the secondary pipe line 35 of the high pressure selection V-yattle valve 39 of the operating circuit 33, 33' is connected to the operating boat and the operating switching valve 38 is operated in the hoisting or hoisting direction, that is. It is an automatic switching valve that operates when the hydraulic motor 36 is operated, and its two primary ports are connected to the secondary side of the clutch operation switching valve 40 and the oil tank 31, respectively. 43 is the foot pedal 12 and the rod 6.1.
This is a positive/negative selection switching valve that selects between a positive brake consisting of a foot brake consisting of a brake pedal and a negative brake consisting of a compression spring 19 and a brake cylinder 15. , the automatic switching valve 4
2 and the respective secondary boats of the variable pressure reducing valve 7, and the secondary port is connected to the brake cylinder 15.

In this operating device, when the positive/negative selection switching valve 43 is used in the positive brake side, that is, in the right position in the figure, the secondary port of the variable pressure reducing valve 7 communicates with the brake cylinder 15, so that the aforementioned brake operation is possible. It is possible. A free haul can be performed by turning the clutch operation switching valve 40 to the left position as shown in the figure, turning off the clutch, and operating the foot pedal 12.

On the other hand, if the positive/negative selection switching valve 43 is used in the illustrated position, it can be used as a negative brake.

That is, if the clutch operation switching valve 40 is switched to the right position to turn the clutch on, and the operating lever 38a is operated in the hoisting or hoisting direction, the main circuit switching valve 37 is switched and the hydraulic motor 36 is driven. At the same time, the automatic switching valve 42
is switched to the left position and operating pressure oil is supplied to the brake cylinder 15, so the brake is turned off and hoisting or lowering can be performed.When the operating lever 38a is in the neutral position, the brake cylinder 15 is operated as a switching valve. 43, 42 and the oil tank 31 (the two communicate with each other through the pipe line 50), so the brake is turned on.

However, with this conventional operating device, when moving from a negative brake operation state to a free-haul control state,
Clutch operation switching valve 40 and positive/negative selection switching valve 4
3 and 3, it has the disadvantage that it is complicated to operate without it.

In view of the above-mentioned drawbacks, the present invention provides an operating device for a hoisting quinte that is configured to obtain a large braking force during positive brake operation and to easily switch from negative brake operation to free haul. With the goal.

In order to achieve this object, the present invention includes a hydraulic motor that moves the hoisting winch, a main circuit switching valve that rotates the hydraulic motor in forward and reverse directions, and a valve that applies force to the side that releases the clutch of the hoisting winch. and a clutch mechanism having a clutch cylinder that operates toward the side where the clutch is connected by supplying pressure oil;
An automatic brake mechanism having a foot brake for braking the hoisting winch, a compression spring that applies force to the hoisting quinte to the brake side, and a brake cylinder that operates to the side for releasing the brake by supplying pressure oil, and each of the above-mentioned cylinders, etc. A hoisting winch operating device comprising: a first switching valve that can be switched arbitrarily; and second and third switching valves that are switched in conjunction with operation and stop of the hydraulic motor. valve, and a variable pressure reducing valve that increases or decreases the secondary pressure according to the depression force (2) of the foot brake, and connects the two primary side boats of the first switching valve to the operating hydraulic source and the oil tank, respectively. Connect the two secondary boats of connection-7 to the primary ports of each of the second and third switching valves, respectively.
The other primary port of each of the switching valves is connected to an operating hydraulic power source, and each secondary port of the second and third switching valves is connected to the primary port of the first switching valve connection side when the hydraulic motor is stopped. It has a structure in which the two side boats 6 communicate with each other and the primary side boat on the side connected to the operating hydraulic power source when the hydraulic motor is operated, and the secondary side boat of the second switching valve is connected to the clutch cylinder, and the third side boat is connected to the clutch cylinder. A secondary side boat of the switching valve is connected to the brake cylinder via the variable pressure reducing valve.

The details of the present invention will be explained below with reference to an embodiment shown in FIG. In FIG. 6, 7.15 is a variable pressure reducing valve and a pressure reducing valve as shown in FIG. Hydraulic pump, which is the source, 3
6 is a hydraulic motor for driving the hoisting winch, 32 is a hydraulic pump as its hydraulic source, 37 is a main circuit switching valve, and 38 is a switching valve for operating the winch.

45, 46, and 47 are first, second, and third switching valves incorporated according to the present invention, the first switching valve 45 being manually operated, and the two primary boats thereof are respectively connected to the pipe line 50.
, 51 to the discharge side of the operating hydraulic pump 22 and the oil tank 31, and the two secondary boats are connected to one of the second and third switching valves 46, 47 via pipes 52, 53, respectively. connected to the primary port of the Second switching valve 46
is hydraulically operated, and the other primary port is connected to pipe 5.
4.55 to the discharge side of the hydraulic pump 22,
The secondary boat is connected to the clutch cylinder 44 via a line 56, and the operating boat is connected to the secondary side of the Schaer valve 39 via a line 57. Third
The switching valve 47 is also hydraulically operated, and the other primary side port is connected to the discharge side of the hydraulic pump 22 via pipes 5B and 55 like the second switching valve 46, and the secondary side boat is It is connected to one primary side port of the variable pressure reducing valve 7 via a conduit 59, and the operation boat is connected to the secondary side of the shuttle valve 39 via a conduit 60. Variable pressure reducing valve 7
The secondary side of the brake cylinder 15 is connected to the brake cylinder 15 via a conduit 61.
The other primary boat is connected to the oil tank 31 via a conduit 62.

In this embodiment, the first switching valve 45 is in the left position as shown in the figure.

In this case, the operating lever 38a is in the neutral position and the hydraulic motor 36
When in the stopped state, operating pressure oil is not supplied to the operating boats of the second and third switching valves 46, 47, so these valves are in the right position as shown in the figure, and therefore the switching valves 45, 46 and the pipe line are Operating pressure oil is supplied to the clutch cylinder 44 through the clutch cylinders 50, 52, and 56, and the clutch is turned on. Additionally, the brake cylinder 15 is connected to the oil tank 31 via a switching valve 45.47, a variable pressure reducing valve 7, and a pipe line 51.53.59.61.
The automatic brake is turned on by the action of the compression spring 19 shown in FIG. When operating the hydraulic motor 36 by operating the operating lever (-38a) in the hoisting or hoisting direction, the shuttle valve 39 and the pipe line 57.60 are connected to the operating boats of the second and third switching valves 46.47. Operating pressure oil is supplied through the lines 55, 58 . to switch these switching valves to the left position.
5゛ 9.61, operating pressure oil is supplied via the third switching valve 47 and the variable pressure reducing valve 7, and the brake is turned off.
On the other hand, the clutch cylinder 44ζ2 is connected to the conduit 55.54.
56 and the second switching valve 46 to maintain the clutch-on state, hoisting and lowering are possible.

When the first switching valve 45 is switched to the right position, the pipe line 52.5
3 communicate with an oil tank 31 and a hydraulic pump 22, respectively. Here, if the operating lever 38a is in the neutral position, the second and third switching valves 46, 47 are in the right position, so the clutch cylinder 44 is communicated with the oil tank 31, and the brake cylinder 15 is communicated with the operating hydraulic pressure source. Because of this, the clutch is turned off and the brakes are turned off automatically. Therefore, the foot pedal 12
When the pedal is depressed and the variable pressure reducing valve 7 is activated, the pressure of the pressure oil in the brake cylinder 15 is reduced, and the resultant force of the pedal force and the spring force of the spring 19 turns on the brake, and when it is released, the brake is turned off. This allows normal Bojite 4-brake operation (free haul).

If the foot pedal 12 is released when the f1%l switching valve 45 is in the right position and the operating lever 381 is operated in the hoisting or hoisting direction, the operating pressure oil is transferred to the second and third switching valves 46, 47
Since the clutch cylinder 4.4 is connected to the hydraulic pump 22 via the line 55, 54, 56 and the second switching valve 46, the clutch is turned on. Furthermore, since the hydraulic pump 22 is communicated with the variable pressure reducing valve 7 via the third switching valve 47 and the pipes 55, 58, and 59, hoisting and lowering can be performed by operating the lift brake.

As described above, according to the configuration shown in FIGS. 1 and 6, switching between the positive brake (foot brake) and the negative brake (automatic brake) can be performed simply by switching the switching valve 45 at @i. Furthermore, any brake operation can be performed with a single operating lever 38a, eliminating the need for conventional clutch lever operation. Furthermore, even if the prime mover (not shown) of the hydraulic pump 22 or 32 stops for some reason during hoisting or lowering, the spring force of the compression spring 19 will automatically apply the brake to prevent the suspended load from falling. .

In addition, as a conventional automatic brake device, a hydraulic motor 36
There is a system that applies a hydraulic brake using a kakunta balance valve 63, but such conventional devices have a problem in that the suspended load inevitably falls due to oil leakage inside the hydraulic motor 36 caused by the hydraulic brake. There is.

On the other hand, in the present invention, by employing a configuration in which the drum 1 is braked by the brake band 2 as shown in FIG. 1, the hanging load can also be prevented from falling. -Furthermore, by following the brake mechanism shown in Figure 1, the spring force of the automatic brake compression spring 19 can be added to the braking force during positive braking, so a large braking force can be achieved with a small pedal force. It goes without saying that you can get it.

FIG. 7 shows another embodiment of the present invention, in which a manual switching valve 64 is used as the main circuit switching valve, and when the main circuit switching valve 64 is in the left or right position, the operating pressure oil is A switching valve 6 that is guided to the operation boat of the second and third switching valves 46 and 47 and communicated with the oil tank 31 when in the neutral position.
5. This embodiment can also achieve the same effects as the previous embodiment.

FIG. 8 shows an embodiment in which the present invention is applied to a machine having a plurality of hoisting winches, and as shown in the figure, the first switching valve 45
is shared by each winch, and by connecting the second switching valve 46 and the third switching valve 47 corresponding to each winch in parallel to the secondary circuit thereof, the operating device can be simplified.

In addition, in each of the above examples! 1141 switching valve 4
Although a manual switching valve is used as No. 5, it may be of any type as long as it can be switched arbitrarily, and a solenoid type or hydraulic type may also be used.

As described above, according to the present invention, it is possible to easily switch between the winch operation using the front brake and the winch operation using the negative brake by operating one switching valve (first switching valve). As a result, it becomes extremely easy to switch from a winch operation using a negative brake to a free haul operation and vice versa.

Further, by switching the first switching valve, the operator can easily select the winch operation method preferred by the operator, whether he or she is familiar with hydraulic cranes or mechanical cranes. In addition, both the winch operation using the positive brake and the winch operation using the negative brake can be performed with a single operating lever for driving the hydraulic motor, eliminating the need for the conventional clutch lever operation.

Furthermore, even if the prime mover stops during hoisting or power hoisting, the automatic brake is applied to prevent the suspended load from falling.

Furthermore, since the drum is braked when the negative dip brake is operated, it is possible to prevent oil leakage and lowering of the suspended load when using a hydraulic brake.

Furthermore, when operating the positive brake, the spring force of the compression spring for the negative brake can be added to the braking force, so a large braking force can be obtained with a small pedal force.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram showing a conventional brake system in a pre-kine operating state, Figure 's2 is a hydraulic circuit diagram showing the position of the variable pressure reducing valve in the pre-kine operating state, and Figure 3 shows a conventional brake equipment in a brake operating state. A configuration diagram showing the state turtle;
The fourth factor is a hydraulic circuit diagram showing the position of the variable pressure reducing valve in the brake operation state, and Figure 5 is similar to Figures 1 to 1! Fig. 14 is a hydraulic circuit diagram of an operating device for a hoisting winch having a clutch incorporating an automatic brake circuit in a conventional braking device, and Fig. 6 shows an embodiment of an operating device for a hoisting winch according to the present invention. Hydraulic circuit diagram, Fig. 7 is a hydraulic circuit diagram showing another embodiment of the present invention in which the main circuit switching valve is manually operated.
This is a hydraulic circuit diagram showing an embodiment of the present invention in which a plurality of hoisting quintes are provided. 7... Variable pressure reducing valve, 12... Foot pedal, 15...
・Brake cylinder, 19,448'...compression spring,
22... Hydraulic pump for operation, 31... Oil tank. 3
6...Hydraulic motor, 37.64...Main circuit switching valve,
44...Clutch cylinder, 45...First switching valve-146...Second switching valve, 47...Third switching valve Patent applicant Hitachi Aki Co., Ltd.

Claims (1)

[Claims] 1. A hydraulic motor that drives the hoisting quinte, a main circuit switching valve that rotates the hydraulic motor in forward and reverse directions, a spring that applies force to the side that releases the clutch of the hoisting quinte, and a pressure oil supply. A clutch mechanism has a clutch cylinder that operates to the side that connects the clutch, a foot brake that brakes the hoisting winch, and a compression spring and pressure oil supply that applies force to the side that brakes the hoisting winch to release the brake. In the operating device for a hoisting winch, which includes an automatic brake mechanism having a brake cylinder that operates to the side, and a hydraulic pressure source for operating each of the cylinders, etc., optionally; The first switching valve is equipped with second and third switching valves that are switched in conjunction with operation and stop of the motor, and a variable pressure reducing boat that increases or decreases the secondary pressure according to the depression force of the foot brake. The two primary side ports are respectively connected to the operating hydraulic power source and the oil tank, and the two secondary side boats are respectively connected to one primary side boat of each of the second and third switching valves. 2. The other primary port of each of the third switching valves is connected to the operating hydraulic power source, and each secondary port of the second and third switching valves is connected to the first switching port when the hydraulic motor is stopped. It has a structure in which it communicates with the primary side port on the valve connection side and also communicates with the primary side port on the operating hydraulic source connection side when the hydraulic motor is operated, and connects the secondary side boat of the second switching valve to the clutch cylinder. An operating device for a hoisting quinch, characterized in that a secondary side port of the third switching valve is connected to the brake cylinder via the variable pressure reducing valve. 2. In a machine having multiple hoisting winches, the first switching valve is shared by each hoisting winch, and second and third switching valves corresponding to each hoisting winch are provided on the secondary side of the first switching valve. An operating device for a hoisting quinte according to claim IJI, characterized in that each of the hoisting quinte operating devices is connected and installed in parallel.