JPS58130893A - 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 an operating device for a hoisting winch in a crane.

There is a device described in Japanese Patent Publication No. 17500/1983 (1988) as a device that can simplify the operations of hoisting up, hoisting down, stopping, and free-falling using the hoisting winch C2.

This known operating device will be explained with reference to FIGS. 1 and 2. This device includes a brake IC of a hoisting drum: a brake release mechanism 4 is provided between the connected link 2 and the foot pedal 9, and the brake release device 114 is connected via a front g pilling 2≦two rods 3. It consists of a cylinder 5, a piston 6 housed in the cylinder 5 and connected to the foot pedal 9 via a rod 8, and a spring 7. The cylinder 5 is connected to a clap lever 10 (two-way connected). Further, the elastic force of the spring 7 is such that when the foot pedal 9 is operated, the piston 6 and the cylinder 5 are integrally moved by 12l1lJ, and when hydraulic pressure or pneumatic pressure is applied via the pipe 14, the elastic force is The force is set to contract the spring 7. 21 is a pedal lock device. 1
Figure 82 shows the operating circuit of the hoisting winch, and 15
17 is a main circuit switching valve that rotates the hydraulic motor 16 in forward and reverse directions; 18 and 19 are a hydraulic pump and an Akiou-mulator that constitute operating hydraulic power sources, respectively; , 20 are automatically switched from the illustrated state when the main circuit switching valve 17 is in the left or right position, that is, when the hydraulic motor 16 is operating.
This is a switching valve that guides operating pressure oil to the primary side of the distribution switching valve 11.

In this known hoisting winch operating device, when the main circuit switching valve 17 is operated in the hoisting or hoisting direction -2, the switching valve 20 is automatically switched to the side where the operating hydraulic source and the switching valve 11 are communicated. By switching the pedal locking device 21 to the locked state and operating the clap lever lO to guide operating pressure oil to the clutch cylinder 12 and cylinder 5,
The clutch can be engaged and the brake released, and one hoisting operation can be performed. In addition, during free descent, by removing the pedal lock device 21 and depressing the foot pedal 9 without operating the clap lever 10, the cylinder 5 and the piston 6 are moved integrally in the 2X direction, and the hoisting winch is moved. You can apply the necessary braking.

However, this known device has the following drawbacks.

(1) If the clutch lever 10 is turned off, the hoisting lever 22 for operating the main circuit switching valve 17 cannot be hoisted or lowered even if the hoisting lever 22 is operated. Always use the two levers 1 for the upper and power lowering time controls.
0.22 is required.

(2) Even if the clap lever 10 is turned on.

When the hoisting lever 22 is in the neutral position, the clutch is off, so the foot pedal 9 must be depressed. If the timing of depressing the foot pedal 9 is delayed, the suspended load will fall. Put it away.

(3) Even if the clap lever lO is turned on,
If the hoisting lever 22 is in the neutral position, it will be turned off, so even if the clutch lever 1O is off, the hoisting lever 22 is turned on and the brake is turned off. This may cause the suspended load to fall.

(4) Hydraulic pump 15 during hoisting with the brake off.
When the prime mover No. 18 stops, the clutch automatically turns off and the suspended load falls.

In view of the above points, the present invention simplifies operation and (
Second, it is an object of the present invention to provide an operating device for a hoisting winch that is free from the possibility of lowering of a suspended load due to operation errors.

In order to achieve this object, the present invention includes a hydraulic motor that drives a hoisting winch, 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 coolatte, and a pressure oil supply. A clutch mechanism that has a ring (hereinafter referred to as a clutch cylinder) that operates on the side that connects the clutch.

A foot brake that brakes the hoisting winch, and a spring and pressure oil supply C that applies force to the side that brakes the hoisting winch.
2. A hoisting winch operating device (-) equipped with a manual brake mechanism having a cylinder that operates on the side that releases the brake (hereinafter referred to as the brake cylinder) and a hydraulic pressure source for operating the clap cylinder and the brake cylinder. Two primary boats are each connected to the operating hydraulic power source and oil tank, and two primary boats are connected to each of the two secondary boats.
a first switching valve capable of switching and connecting each of two primary boats, and two primary boats each connected to one secondary boat of the first switching valve and the operating oil field source C2,
The secondary boat is connected to the clutch cylinder, and when the hydraulic motor is stopped (: indicates that the secondary boat is connected to the secondary boat of the first switching valve in the Iil period (2 is connected, and when the hydraulic motor is in operation, the secondary boat is connected to the hydraulic motor). The operating hydraulic power source≦2 A second switching valve communicating with the two primary side boats is connected in front of lR1, respectively.
The other secondary side boat of the switching valve and the separate operating hydraulic source a;
When the hydraulic motor is stopped, the secondary boat is connected to the bushing brake cylinder 6, and when the hydraulic motor is stopped, the secondary boat is connected to the first switching valve. Sometimes the secondary boat is characterized in that it is equipped with a third switching valve that communicates with the hydraulic pressure source for operation.

The details of the present invention will be explained below with reference to Embodiment C2 shown in FIG.
One end of the link 32 is connected to the link 32, which is rotatable about 7-), and the other end of the rod 33, which has one end connected to the pedal 9, is connected to the other end of the link 32.
: Provided long hole 33a and link 32 (bin 4 with two numbers)
5, and when the foot pedal 9 is inserted, the hoisting drum 47 is also braked (46 is an adjustable brake mechanism, and this mechanism is
A rod 34 whose elongated hole 34 & at one end of the link 32 section is engaged by a pin 48 , and the rod 344 and the piston 36
A is connected to the brake cylinder 36 and 1 spring 3
The rod 34 moves to the left in the figure against the force of the spring 35 to release the brake, and the force of the spring 35 is also applied to the pressure bending force. At this point, the rod 34 moves to the right in the figure to apply the brake.

50 is a clutch mechanism between the hydraulic motor 16 and the hoisting winch, and this mechanism includes a clutch 52 that rotates together with a shaft 51 rotated by the hydraulic motor 16, and a spring 53.
It consists of a built-in clutch cylinder 54, and when pressure oil is supplied to the clutch cylinder 54, the clutch cylinder 54 extends and the clutch 52 is connected to the hoisting drum 47 (2), and when the pressure oil is discharged, the clutch is closed by the force of the spring 53. The cylinder 54 is in the C2 position so that the cylinder 54 contracts and the clutch is released from the hoisting drum 47.

37 is a main circuit switching valve inserted in a conduit between the hydraulic pump 15 and the hydraulic motor 16;
The main circuit switching valve 37 is a hydraulically operated switching valve, and the pipes 55 and 56c between the left and right operating chambers and the hydraulic pump 18, which is the operating hydraulic pressure source, are connected to the operating valve 3 having the operating lever 38a.
8 is inserted and the operating lever 38a is tilted to the right in the figure, the main circuit switching valve 37 is switched to the right position, and the hydraulic motor is rotated in the downward direction, and when the cage is tilted to the left in the figure, the main circuit The switching valve 37 is switched to the left position ≦2 so that the hydraulic motor is rotated in the lowering direction and stopped at the neutral position shown in the figure.

40, 41, and 42 are the first, second, and third switching valves provided according to the present invention 6, respectively, and the first switching valve 40 has a four-bottom, two-position, 1. IJ! I
I valve, and its two primary boats are connected to pipe 5, respectively.
Hydraulic pump 18 for operation and oil tank 59 via 7, 58
and the two secondary boats each have a conduit 60
．． 61 to one of the primary boats of the second and third switching valves 41 and 42. Second and third switching valves 4
1.42 is a hydraulically operated three-bottom, two-position switching valve, and when the RIJ operating lever 381L is in the non-neutral position, C2 is a shuttle valve 39 that controls the pressure in either of the pipes 55, 56. When the side pressure curve is selected, hydraulic pressure is applied to each operating chamber 41a, 42& via the pipe lines 62, 63, and the state shown in the figure is switched. The other primary side port of the second switching valve 41 is connected to the operating hydraulic pump 1 via the 1' passage 64.
8, and the secondary boat is connected to the clutch cylinder 54 via a conduit 65. The other primary port of the third switching valve 42 is connected to the operating hydraulic pump 18g via a pipe 66, and the secondary port is connected to the brake cylinder 36 via a pipe 67.

Next, the operation of this device will be explained. First switching valve 4
0 is in the illustrated left position, the clutch cylinder 54 is connected to the conduit 57. First switching valve 40, pipeline 60
, the operating pressure oil is sent through the second switching valve 41.1° path 65, and the clap is in the on state. On the other hand, the brake cylinder 36' communicates with the oil tank 59 via the pipe line 67, the third switching valve 42, the pipe line 611, the first switching valve 40, and the pipe line 58, so that the hydraulic pressure inside the brake cylinder 36 is is the tank pressure, and the brake is applied by the force of the spring 35, and the brake is maintained in the on state even when the foot pedal 9 is turned off.

In this state, when operating the hydraulic motor 16 in the hoisting or hoisting direction by tilting the operating lever 38m to the right or left, the high-pressure side pressure oil selected by the shuttle valve 39 is transferred to the twenty-first third switching valve 41. 42 operation chambers 41a and 42a (2), these valves are switched to the left position C2. The clutch remains on because it communicates with the hydraulic pump 18. On the other hand, the brake cylinder 36 is connected to the pipe 671, the third switching valve 42, the pipe 6
The brake cylinder 36 is connected to the hydraulic pump 18 via the brake cylinder 36, so the hydraulic oil is guided to the brake cylinder 36, and the force of the spring 35 (against the force of the spring 35, the rod 34 moves to the left, so the automatic brake is turned off and the hoisting winch The machine can be hoisted up or hoisted down (powered down).

Next, a case will be described in which the first switching valve 40 is switched to the right position. In this state, if the operating lever 38m is in the neutral position, the second and third switching valves 41142 do not operate, so the clutch cylinder 54 is connected to the pipe 65, the second switching valve 4L, the pipe 60, the first Since the JJ exchange valve 40 and the oil tank 59 are connected to each other via the pipe 58, the clutch is off.

For the brake cylinder 36, operating pressure oil is supplied to the pipe line 66,
The signal is sent through the third switching valve 42 and the conduit 67 to automatically turn off the brake. Therefore, without being affected by automatic braking, the brake is turned on by pressing the foot pedal 9, and the brake is turned off by releasing the foot pedal.
The hanging load can be lowered in a state C2 where a is a raw bean C2.

In a state where the first switching valve 40 is switched to the right position, when the operating lever 38a is operated in the right or left position C: For example, when the hydraulic motor 16 is operated, the second and third Since the switching valves 41 and 42 are switched to the left position,
Operation pressure oil from the hydraulic pump 18 is supplied to the clutch cylinder 54 through the pipe line 64, the second switching valve 41, and the pipe line 65.
, the clutch is turned off, and the brake cylinders 36 (for the two brake cylinders, the pipe 66, the third switching valve 42, and the pipe 67 do not pass through the first switching valve 40).
Since the °C pressure oil is continuously sent through the machine, automatic braking is not applied, so hoisting or power lowering can be performed.

The states of each component in relation to the operating position of the operation valve 38 in this embodiment are summarized as follows (2).

(When operating the hoisting winch No. 11 with the foot pedal 9 (positive brake) (at this time, the first switching valve 40 is the right position) (when operating the hoisting winch No. 21 with the manual brake (this time) (At this time, the switching valve 40 of *i is in the left position.) As is clear from the above explanation, in this device IC,
Position 1 of first switching valve 40: Regardless of operation lever 38
By operating m, hoisting or power lowering can be performed without fail, and lowering of a suspended load is possible by switching the first switching valve 40.

If the prime mover (not shown) of the hydraulic pump 15 or 18 stops for some reason during hoisting or lowering the power, secondly, the action of the spring 35 will keep the brake on and prevent the suspended load from falling. be done. In addition, in the case of a hydraulic brake system that uses a hydraulic brake consisting of a hydraulic motor and a counterbalance valve, the suspended load may fall due to oil leakage inside the hydraulic motor, but the structure 12 shown in Fig. 3 is
Since the hoisting drum 47 is braked by the brake 1 during automatic braking operation when the first switching valve 4.0 is set to the left side V, it is possible to reliably prevent the shipment from falling.

In addition, when the first switching valve 40'a is set to the left position, winch operation using the manual brake mechanism 46 is possible, and when the right position is set to the normal foot pedal 9 (
It is possible to operate the winch using positive brakes, and when selecting either operation method, press the operating lever 3.
Wiener operation is possible with a single operation of 8a.

FIG. 4 shows another embodiment of the present invention, and this embodiment uses a manual switching valve 17 having a single hoisting lever 22 as the main circuit switching valve, similar to the known example shown in FIG. Co-viewer: 1
As a switching valve for operating pressure oil, a switching valve 20 is used that operates only when hoisting or lowering, and only when the main circuit switching valve 17 is in the left or right position. Operation chamber 4 of the 21st and 3rd switching valves 41 and 42 arranged on the secondary side
1m and 42m are connected. This embodiment also has the same effect as the eleventh embodiment.

Fig. 5 shows an embodiment in which the present invention is applied to a machine having a plurality of hoisting winches. In this example, the same number of switching valves 40 may be provided, but as in this embodiment, the first switching valve 40 is shared by each hoisting winch, and the secondary side circuit of the first switching valve 40 is connected to each By connecting the winch-compatible second switching valve 41 and third switching valve 42 in parallel, the operating device can be simplified.

In addition, in the above embodiment C, a manual type is shown as the first switching valve 40, but it may be a type that can perform arbitrary two-way switching, and a solenoid type or hydraulic type may be used. May be used. Also, the second. The switching valves 41 and 42 of the ff13 may be electromagnetically operated, and these switching valves may be operated by a switch that opens and closes by moving the hoisting lever 22 or the like.

As described above, according to the present invention, by selecting the operation position of the first switching valve, the normal positive brake 6
It is possible to switch between two-way winch operation and two-way brake (two-way winch operation), so whether you are familiar with hydraulic cranes or mechanical cranes, the operator can operate according to his/her preference. You can choose the method.

Also, even when performing positive brake operation,
When operating the l-brake, it is possible to change the direction of rotation of the hydraulic motor and operate the clutch simply by operating the operating means for the hydraulic motor, and there is no need to operate the gangway lever, making the operation easier. This prevents the suspended load from falling due to operational errors.

Also, if the original @ machine stops during hoisting or lowering C;
Since the automatic brake is turned on, the hanging load can be prevented from falling.

In addition, in the conventional device, when braking is performed using a hydraulic brake using a hydraulic motor and a counterbalance valve 52, the suspended load sometimes falls due to oil leakage inside the hydraulic motor.
In C2 when the brake is operated according to the present invention, the hoisting drum is directly braked, so that the hanging load can be prevented from falling.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a known hoisting winch operating device;
The figure is a hydraulic circuit diagram, Figure m3 is a hydraulic circuit diagram showing one embodiment of the hoisting winch operating device according to the present invention, Figure 4 is a hydraulic circuit diagram showing another embodiment of the present invention, and Figure 5 is a hydraulic circuit diagram showing an embodiment of the hoisting winch operating device according to the present invention. FIG. 2 is a hydraulic circuit diagram showing an embodiment in which the present invention is applied to a machine having a plurality of 9-inch hoists. 1...Brake, 15.18...Oil field pump, 16
...Hydraulic pressure ←, 17.37...Main circuit switching valve, 35
153... Spring, 36... Brake cylinder, 40... First switching valve % 41... Second switching valve %
42...Third switching valve %54...Clutch cylinder patent applicant Hitachi Construction Machinery Co., Ltd. Agent Patent attorney Tadashi Akimoto Actual agent Patent attorney Masaru Wakade −

Claims (1)

[Claims] 1. The clutch is connected by a hydraulic motor that drives the hoisting winch, 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, and an oil supply. A clutch mechanism having a clutch cylinder that operates to the side, a foot brake that brakes the hoisting winch, and 1
A spring that applies force to the side that brakes the hoisting winch and a pressure oil supply; a variable brake mechanism that has a brake cylinder that operates to the side that releases the brake; and a hydraulic pressure source for operating the clap cylinder, brake cylinder, etc. In the hoisting winch operating device, the two primary boats are each connected to the operating hydraulic power source and the oil tank, and each of the two primary boats is connected to each of the two secondary boats. Switchable valve @1 that can be connected to switch, and 2
The two primary boats are each connected to one secondary boat of the switching valve of 1IIIl Encyclopedia 1 and the operating oil E1:#A, and the secondary boat is connected to the clutch cylinder,
When the hydraulic motor is stopped, the secondary boat communicates with the secondary boat of the first switching valve, and when the hydraulic motor slows down, the secondary boat communicates with the operating hydraulic power source C: WL2 switching. the other secondary boat of the first switching valve and the operating hydraulic source I.
: Connected, the secondary boat is connected to the brake cylinder, and the hydraulic motor stops: The secondary boat is connected to the brake cylinder.
l The first switching valve is connected to the other secondary boat,
A hoisting winch operating device characterized in that when the hydraulic motor is in operation (= is a third switching valve through which the secondary boat communicates with the operating hydraulic power source. 2. Having a plurality of hoisting winches. Machine C2, 1st
A patent characterized in that a switching valve is shared by each hoisting switch, and two 24th and 3rd switching valves corresponding to each hoisting switch are connected in parallel on the secondary side of the first switching valve. An operating device for a winding window according to claim m1.