JPH05246694A - Controller for winch - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the undesired dropping of the suspended load while the winch drum is being hoisted and unwound. [Structure] A planetary reduction mechanism 2 for reducing the rotation of a hydraulic motor 3, and a first winch drum 1 integrated with a ring gear 2a (or carrier shaft 4) of the planetary reduction mechanism 2
Brake device 10 and a second brake device 20 for braking the brake drum 5 integrated with the carrier shaft 4 (or the ring gear 2a), and the first brake device 10 is released and the second brake device 20 is In a winch control device that performs hoisting and lowering in the first state of braking, the first braking device 10 performs braking and the second braking device 20 performs free fall in the second state of release, the brake drum 5
A lock device 30 that engages the lock claw 31 with the lock device 30 to prevent it from rotating in the unwinding direction. When a condition other than the first condition is set, the lock device 30 is activated and the second condition is Lock device 3 when set
0 is deactivated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winch control device suitable for being mounted on a hydraulic crawler crane used for crane work or clamshell work.

[0002]

2. Description of the Related Art As a conventional winch control device of this type, there is known one disclosed in, for example, Japanese Patent Laid-Open No. 63-8197. This will be described below with reference to FIGS. FIG. 3 shows an example of a winch to which the control device disclosed in Japanese Patent Laid-Open No. 63-8197 is applied. In this figure, 71 is a winch drum, 72 is a clutch drum integrated with the winch drum 71, and 73 is a winch. It is a hydraulic motor that rotationally drives the drum 71. The rotation of the hydraulic motor 73 rotates the sun gear 7 that constitutes the planetary speed reduction mechanism 74.
4a, planetary gear 74b, carrier shaft 74c, sun gear 7
4d, it is decelerated and transmitted to the carrier shaft 75 via the planetary gear 74e. Here, the planetary gears 74b and 74e
Is a ring gear 74f separate from the winch drum 71.
It meshes with (non-rotatable).

An internally expandable clutch band 76 is integrally attached to the carrier shaft 75 via a clutch release cylinder 77. When pressure oil is not supplied to the cylinder 77, the clutch band 7 is urged by a spring 78.
6 is pressed against the inner peripheral surface of the clutch drum 72, and the clutch-on state is maintained. Then, in this state, the hydraulic motor 7
When the carrier shaft 75 rotates by 3, the rotation is transmitted to the clutch drum 72 and the clutch drum 72 rotates, and the winch drum 71 integrally rotates accordingly. That is, the winch drum 71 is hoisted or lowered, whereby the suspended load is raised or lowered. Further, when pressure oil is supplied to the cylinder 77, the pressing of the clutch band 76 on the clutch drum 72 is released and the clutch is turned off.
Is not transmitted to the clutch drum 72, and the winch drum 71 does not rotate. Reference numeral 79 is a fluid rotary joint that is connected to the carrier shaft 75 and guides pressure oil to the cylinder 77.

On the other hand, an engaging groove 71a is formed on the outer peripheral surface of the flange portion 71A formed at one end of the winch drum 71 as shown in FIG. 4, and the locking device 80 is formed in this engaging groove 71a. The lock claw 81 is engaged. The lock claw 81 is constantly urged by the spring 82 in the direction in which the lock claw 81 is engaged with the engagement groove 71 a, and the engagement is released by the extension of the lock release cylinder 83. This unlock cylinder 83 is driven by the hydraulic control circuit shown in FIG. That is, when the clutch is on, the selection switch 9
Winch control lever (not shown) after switching 1 to automatic
Is switched to the winch drive position, the hydraulic motor 73 rotates to wind and lower the winch drum 71 as described above, and the pressure switch 92 is turned on.
The solenoid valve 93 switches from the "a" position to the "b" position. As a result, the oil discharged from the hydraulic power source 94 is released from the lock release cylinder 83.
Is supplied to the lock claw 81, the lock claw 81 is driven to the position shown by the broken line in the figure against the biasing force of the spring 82, and the engagement between the lock claw 81 and the engagement groove 71a is released (lock device 80). Will be unlocked). That is, when the operation lever is operated to wind up and wind down the winch drum 71, the lock device 80 is automatically unlocked.

When the operating lever is switched to the neutral position in this state, the hydraulic motor 3 stops and the pressure switch 9
2 is turned off, and the timer 95 is activated accordingly. The timer 95 cuts off the energization of the solenoid valve 93 after the predetermined time is counted, whereby the solenoid valve 93 returns to the "a" position. As a result, the pressure oil acting on the lock release cylinder 83 returns to the tank 97, and the lock claw 81 is locked in the engagement groove 71a by the urging force of the spring 82 (the lock device 80 is locked). Therefore, the suspended load does not undesirably drop due to its own weight when the operation lever is in the neutral position. The reason why the timer 95 is provided to delay the engagement of the lock pawl 81 is to prevent the lock pawl 81 from being engaged before the rotation of the winch drum 71 is completely stopped. On the other hand, when the selection switch 91 is switched to the manual position, the solenoid valve 9 is operated by operating the manual switch 96.
3 can be switched, that is, the lock device 30 can be locked / unlocked. Therefore, by unlocking the lock device 30 with the operation lever in the neutral position, a so-called free fall, in which the suspended load is lowered by its own weight, can be performed.

[0006]

By the way, the clutch band 76 and the clutch drum 7 are caused, for example, by oil leakage of the clutch release cylinder 77 at the time of winding or winding.
When the oil permeates between the inner peripheral surface of the carrier 2 and the inner peripheral surface of the carrier 2, the frictional force between the two lowers and the carrier shaft 75 idles, and the carrier shaft 75 is rotated to rotate the clutch drum 72, that is, the winch drum 7.
Can not be transmitted to 1. On the other hand, in the conventional device described above,
Since the lock pawl device 80 is always in the unlocked state at the time of winding and lowering, the winch drum 71 may undesirably rotate in the lowering direction when the carrier shaft 75 idles as described above. ..

It is an object of the present invention to provide a winch control device which prevents undesired rotation of the winch drum during winding and lowering of the winch drum.

[0008]

The invention of claim 1 will be described with reference to FIG. 1 showing an embodiment.
And a planetary speed reduction mechanism 2 connected to the output shaft 3a of the hydraulic motor 3 to reduce the rotation of the output shaft 3a, and a winch drum integrated with one of the ring gear 2a and the carrier shaft 4 of the planetary speed reduction mechanism 2. 1, a first braking device 10 for braking the input side of the planetary speed reduction mechanism 2, a brake drum 5 that is integrated with one of the ring gear 2a and the carrier shaft 4 separate from the winch drum 1, and The second brake device 20 for braking the brake drum 5 is provided, and the first brake device 10 is released, and the second brake device 20 is in the first state in which the hydraulic motor 73 winds or lowers the brake. The present invention is applied to a winch control device in which a free fall is performed in a second state where the first brake device 10 is braking and the second brake device 20 is released. Then, the lock device 30 that engages the lock claw 31 with the brake drum 5 to prevent the brake drum 5 from rotating in the lowering direction, and activates the lock device 30 when the first state is set, When the second state is set, the lock device 30 is provided with the control means 100 which is in the inoperative state, thereby solving the above problems. To explain in association with FIG. 2, the invention of claim 2 includes the hydraulic motor 3, the planetary speed reduction mechanism 2, the winch drum 1, and a first brake device 10 ′ for braking the winch drum 1. , Brake drum 5 and second
And a first braking device 1
In the first state where 0 ′ is released and the second brake device 20 ′ is in the braking state, hoisting and lowering are performed by the hydraulic motor.
Brake device 10 'and second brake device 20'
Is applied to a winch control device in which a free fall is performed in the third state of release. Then, the lock device 30 and the control means 100 'that activates the lock device 30 when the first state is set and deactivates the lock device 30 when the third state is set. To solve the above problems.

[0009]

[Action]

(1) Invention of Claim 1 When the first state is set, that is, when winding and winding are performed, the lock device 30 is held in the operating state, and rotation of the brake drum 5 in the winding direction is blocked. .. This prevents the winch drum 1 from undesirably rotating in the lowering direction even if the braking effect of the second brake device 20 is lowered during the winding and lowering.
Further, when the second state is set, the lock device 30 is deactivated accordingly, so that the free fall can be performed. (2) Invention of Claim 2 Since the lock device 30 is held in the operating state when the first state is set as described above, the rotation of the brake drum 5 in the lowering direction is prevented, and the winch drum 1
It is possible to prevent undesired rotation in the unwinding direction. Further, when the third state is set again, the lock device 30 is brought into the inoperative state, so that the free fall can be performed.

Incidentally, in the section of means and action for solving the above problems for explaining the constitution of the present invention, the drawings of the embodiments are used for the purpose of making the present invention easy to understand. It is not limited to.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. In FIG. 1, 1 is a winch drum that is rotatably supported, and 2 is a planetary reduction mechanism that is provided inside the winch drum 1 and that reduces the rotation of the output shaft 3 a of the hydraulic motor 3. The planetary reduction mechanism 2 includes a ring gear 2a integrally provided on the inner peripheral surface of the winch drum 1, a sun gear 2b connected to the output shaft 3a of the hydraulic motor 3, and a sun gear 2b.
And a planetary gear 2c that meshes with the ring gear 2a, and a sun gear 2e connected to the carrier shaft 2d of the planetary gear 2c.
And a planet gear 2f that meshes with the sun gear 2e and the ring gear 2a, and the planet gear 2f is connected to the carrier shaft 4. Reference numeral 5 denotes a brake drum that is connected to the carrier shaft 4 and is separate from the winch drum 1.
This brake drum 5 is rotated by the rotation of.

Reference numeral 10 denotes a negative type brake cylinder (first brake device) for braking the output shaft 3a of the hydraulic motor 3, that is, the input side of the planetary speed reduction mechanism 2. The brake cylinder 10 is provided with pressure oil. When it is not supplied, it is expanded by the urging force of the spring 11 to maintain a braking state (brake operating state), but when pressure oil is supplied, it contracts and becomes a releasing state (brake non-operating state).

Reference numeral 20 denotes a second brake device for braking the brake drum 5. The second brake device 20 includes a brake band 21 wound around the outer peripheral surface of the brake drum 5, and the brake band 21. Link 2 to 21
2 to 24 and a brake pedal 25 connected via a spring 28, and a negative type brake cylinder 26 connected to the link 23. When the brake pedal 25 is not depressed and pressure oil is being supplied to the brake cylinder 26, the brake band 21 is in a loosened state with respect to the outer peripheral surface of the brake drum 5, and the second brake device 20 is released. Although in the state, when the brake pedal 25 is operated, for example, the link 22 to
The brake band 21 is wound around the brake drum 5 via 24, and the second brake device 20 is brought into a braking state.
Even if the brake pedal 25 is not operated, if the supply of pressure oil to the brake cylinder 26 is cut off, the brake band 2 is urged by the urging force of the spring 27 via the links 23 and 22.
1 is wound around the brake drum 5, and the second brake device 20 is in a braking state.

Further, reference numeral 30 is a lock device for preventing the brake drum 5 from rotating in the lowering direction, and the lock device 30 has a tip end engageable with an engagement groove 5a formed on the outer peripheral surface of the brake drum 5. And a lock cylinder 32 that engages and disengages the lock claw 31 with the engagement groove 5a. Lock cylinder 32
Is contracted by the urging force of the spring 33 when pressure oil is not supplied, and at this time the lock claw 31 is engaged with the engagement groove 5a and the lock device 30 is in the locked state (operating state), but the lock cylinder 32 When the pressure oil is supplied to the cylinder 32, the cylinder 32 extends against the urging force of the spring 33, the lock claw 31 retracts from the engagement groove 5a, and the lock device 30 enters the unlocked state (inactive state). ..

Next, the hydraulic drive mechanism (control means) 100 for driving the hydraulic motor 3 and the cylinders 10, 26, 32 described above will be described. Operating hydraulic power source 4
The discharge oil No. 1 is guided to the pilot ports 44a and 44b of the hydraulic pilot type directional control valve (hereinafter simply referred to as switching valve) 44 via the pilot valve 43 operated by the operation lever 42 and the pipe line 51 or 52. As a result, the switching valve 44 is switched from the neutral position in the drawing to the left and right positions. Along with this, the discharge oil from a hydraulic source (not shown) is guided to the hydraulic motor 3 via the switching valve 44 and the conduit 53 or 54, and the hydraulic motor 3 rotates. On the other hand, the oil discharged from the hydraulic pressure source 41 for operation is also guided to the solenoid valve 45 via the conduit 55. The solenoid valve 45 switches between the A and B positions according to the ON / OFF state of the brake mode changeover switch 46, and blocks the pressure oil in the pipeline 55 at the A position and blocks the pressure oil in the pipeline 55 at the B position. It leads to the pipeline 56.

Further, the higher pressure of the pipe lines 51 and 52 is introduced to the brake cylinder 10 via the shuttle valve 47 and the pipe line 57 and also to the pilot port 48a of the switching valve 48. Is becoming
The switching valve 48 switches between the a position and the b position according to the pressure acting on the pilot port 48a. At the a position, the pressure oil in the pipe line 56 is guided to the brake cylinder 26 and the lock cylinder 32, and at the b position, the pipe. Block pressure oil in line 56.

Next, the operation of the embodiment will be described. Figure 1
The case where the brake mode changeover switch 46 is turned off, the first braking device 10 and the second braking device 20 are both in the braking state, and the locking device 30 is in the locking state is shown. When the operating lever 42 is operated to the winding side in this state, pressure is applied to the pipe line 51 via the pilot valve 43 and the switching valve 44 is switched to the left position, so that the discharge oil from the hydraulic source (not shown) switches to the switching valve 44 and the switching valve 44. It is guided to the hydraulic motor 3 via the pipe line 54. On the other hand, the pressure in the pipeline 51 is applied to the brake cylinder 1 via the shuttle valve 47 and the pipeline 57.
0 and the switching valve 48, whereby the brake cylinder (first braking device) 10 is released and the rotation of the hydraulic motor 3 is allowed, and the switching valve 48 switches from the a position to the b position. .. Here, the switching valve 48 is b
Even when switched to the position, both the brake cylinder 26 and the lock cylinder 32 are in communication with the tank 49.
The braking device 20 holds the braking state, and the locking device 30 holds the locking state. That is, at this point, the first brake device 10 is released and the second brake device 20 is set to the first braking state.

In this state, the hydraulic motor 3 is rotated by the pressure oil from the pipe 54, and the rotation is transmitted to the ring gear 2a via the sun gear 2b and the planet gear 2c which constitute the planetary speed reduction mechanism 2. .. At this time, the carrier shaft 4 is connected to the second brake device 2 via the brake drum 5.
Since the rotation is blocked by 0, the ring gear 2a is rotated by the rotation of the planet gear 2c, and the winch drum 1 is integrally rotated in the winding direction accordingly. At this time, the planet gear 2f is not revolved.

When the operating lever 42 is returned to the neutral position in this state, the switching valve 44 returns to the neutral position, pressure oil is not supplied to the hydraulic motor 3, and the pressure in the pipe line 51 is reduced, so that the brake cylinder 10 is reduced. Returns to the braking state, the rotation of the hydraulic motor 3 stops, and the winch drum 1 also stops. When the operation lever 42 is operated in the lowering direction from the neutral position, the winch drum 1 is rotated in the lowering direction and the lowering is performed in the same manner as described above. As described above, when the winch drum 1 is wound up or down, the brake mode changeover switch 46 is turned off and the operation lever 42 is operated. Further, in this embodiment, since the lock device 30 is in the locked state during the winding and the lowering, it is possible to obtain an effect that the undesired rotation of the winch drum 1 in the falling direction can be prevented.

That is, if the lock device 30 is in an unlocked state during the winding and lowering, the oil leaks from the brake cylinder 26 and the oil leaks between the brake band 21 and the outer peripheral surface of the brake drum 5. Therefore, when the braking by the second brake device 20 is effective, the carrier shaft 4 becomes rotatable, so that the hydraulic motor 3
Is not transmitted to the winch drum 1, and the winch drum 1 may undesirably rotate due to the weight of the suspended load. In the present embodiment, the lock device 30 is always in the locked state during winding and lowering. Therefore, even if the braking by the second brake device 20 is ineffective due to the oil leak of the brake cylinder 26, the lock device 30 is not effective. As a result, the rotation of the brake drum 5, that is, the carrier shaft 4 in the lowering direction is reliably prevented, so that the rotational torque of the hydraulic motor 3 can be reliably transmitted to the winch drum 1, and the winch drum 1 is loaded by its own weight. Does not rotate undesirably.

Next, the case of performing free fall will be described. When the brake pedal 25 is depressed in the state of FIG. 1 and the brake mode changeover switch 46 is turned on while the operation lever 42 is held at the neutral position, the solenoid valve 45 is operated.
Is switched to the B position, and the oil discharged from the hydraulic pressure source 41 is transferred to the pipe 55,
It is guided to the brake cylinder 26 and the lock cylinder 32 via the solenoid valve 45, the pipe line 56 and the switching valve 48.
As a result, the lock cylinder 32 extends against the urging force of the spring 33, and as a result, the lock claw 31 retracts from the engagement groove 5a of the brake drum 5, and the lock device 30 is unlocked. However, since the brake pedal 25 is still being operated at this time, the second brake device 20 maintains the braking state and the rotation of the brake drum 5 is still blocked. The brake cylinder (first braking device) 10 also holds the braking state.

When the brake pedal 25 is gradually released in this state, the second brake device 20 is released and the second state (first brake device 10 brakes, second brake device releases). State) is set, the brake drum 5, that is, the carrier shaft 4, is in a rotatable state, and the winch drum 1 rotates integrally with the brake drum 5 in the unwinding direction due to the weight of the suspended load to perform free fall. Be seen. At this time, since the output shaft 3a of the hydraulic motor 3 is prevented from rotating, the sun gear 2b does not rotate, and the planet gear 2c revolves around the sun gear 2b. To stop the free fall, the brake pedal 25 may be depressed to bring the second brake device 20 into a braking state, that is, a state in which the rotation of the brake drum 5 is blocked.

When the operation lever 42 is operated with the solenoid valve 56 switched to the B position, the pipe line 51 or 52
Since the switching valve 48 is switched to the b position via the shuttle valve 47 and the pipe 57 due to the accumulated pressure, the second brake device 20 is brought into the braking state and the lock device 30 is brought into the locked state, and the suspension is performed in the same manner as described above. It can be hoisted and unwound without dropping the load.

FIG. 2 shows another embodiment. In addition,
The same parts as those in FIG. 1 are designated by the same reference numerals, and the description will be focused on the differences. In this embodiment, the brake mode is switched by switching the manual switching valve 90. In addition, the first braking device 10 ′ includes a brake band 101 wound around the outer peripheral surface of the winch drum 1.
And links 102 to 104 to this brake band 101
And brake pedal 1 connected via spring 108
05 and a negative type brake cylinder 106 connected to the link 103. When the brake pedal 105 is not depressed and the pressure oil is supplied to the brake cylinder 106, the brake band 101 is in a loosened state with respect to the outer peripheral surface of the winch drum 1, and the first brake device 10 ′ is Although in the released state, when the brake pedal 105 is operated or the supply of pressure oil to the brake cylinder 106 is cut off, the brake band 101 is wound around the winch drum 1 and the first brake device 10 ′ is locked. Braking state.

Further, the second brake device 20 'comprises a negative type brake cylinder 201 and a brake band 202.
When the pressure oil is not supplied, No. 1 expands by the urging force of the spring 203 to maintain the braking state, but when the pressure oil is supplied, the No. 1 contracts and becomes the released state.

In this embodiment, switching valves 301 and 302 are provided instead of the solenoid valve 45 and the switching valve 48. The switching valve 301 switches according to the higher pressure (selected by the shuttle valve 47) of the pipelines 51 and 52,
Along with this, the operation / non-operation of the first brake device 10 'is controlled. The switching valve 302 switches according to the selected pressure of the shuttle valve 47 and the switching position of the switching valve 90,
Along with this, operation / non-operation of the second brake device 20 ′ and the lock device 30 is controlled.

As shown in the figure, when the switching valve 90 is in the ii position and the operating lever 42 is in the neutral position, the oil discharged from the operating hydraulic power source 41 is discharged from the switching valve 90 and the switching valve 302 in the "a" position. Through the brake cylinder 201 and the lock cylinder 32 respectively, whereby the second brake device 20 'is in the released state and the lock device 30 is in the unlocked state. Also at this time,
The discharge oil from the hydraulic pressure source 41 passes through the switching valve 90,
It is also guided to the brake cylinder 106 that constitutes the first brake device 10 ′ via the switching valve 301 in the “YES” position, so that the first brake device 10 ′ is also in the released state. That is, the first brake device 10 'and the second brake device 10'
The third state is set in which both of the braking devices 20 'are released, and the locking device 30 is unlocked. Therefore, free fall is possible in the same manner as described above. In order to stop the free fall, the brake pedal 105 may be operated to put the first brake device 10 'into a braking state. When the operation lever 42 is operated while the switching valve 90 is at the ii position, the switching valve 301 switches to the “3” position, but since the hydraulic pressure is also guided to the brake cylinder 106 at this time, the first brake device 10 is also operated. '
Holds the released state, and the switching valve 302 holds the "a" position, so that the second brake device 20 'holds the released state.
The lock device 30 maintains the unlocked state, and therefore, the winding and the lowering are not performed.

Further, when the manual switching valve 90 is switched to the i position by the lever 90a in the state shown in FIG. 2, the discharged oil of the hydraulic pressure source 41 also in this case passes through the switching valves 90 and 302 to the brake cylinder 201 and the lock cylinder 32. The second brake device 20 'holds the released state and the lock device 30 holds the unlocked state. Therefore, the free fall and its cancellation can be performed in the same manner as described above.

Here, when the switching valve 90 is in the i position, one pilot port 302a of the switching valve 302 is communicated with the tank 49 via the switching valve 90.
When the operating lever 42 is operated, the pressure acting on the other pilot port 302b (selective pressure of the shuttle valve 47)
Causes the switching valve 302 to switch to the “B” position. As a result, the brake cylinder 202 and the lock cylinder 32 communicate with the tank 49, the second brake device 20 ′ enters the braking state, and the lock device 30 enters the locked state. Further, by operating the operation lever 42, the pipe line 51 or 5
Since the pressure reaches 2, and the pressure acts on the pilot port 301a of the switching valve 301 via the shuttle valve 47, the switching valve 301 is switched to the “low” position. Since it is guided to the brake cylinder 106 via the switching valve 301, the first brake device 1
0'holds the released state. That is, the above-mentioned first state is established. Therefore, the winch 1 is rolled up and down by the rotation of the hydraulic motor 3.

At this time, since the lock device 30 is in the locked state, even if the braking by the second brake device 20 'is not effective due to the oil leakage of the brake cylinder 202, the lock device 30 causes the brake drum 5, that is, Since the rotation of the carrier shaft 4 in the lowering direction is reliably prevented, the rotational torque of the hydraulic motor 3 can be reliably transmitted to the winch drum 1, and the winch drum 1 undesirably rotates due to the weight of the suspended load. There is no such thing.

Further, when the switching valve 90 is switched to the iii position, the brake cylinder 201 and the lock cylinder 32.
Communicates with the tank 49 via the switching valves 302 and 90, so that the second brake device 20 ′ is in the braking state and the locking device 30 is in the locking state. Further, since the brake cylinder 106 also communicates with the tank 49 via the switching valves 301 and 90, the first switching valve 10 'is also in the braking state. When the operating lever 42 is operated in this state, the first lever is operated as described above.
The brake device 10 'is released and the first state is set, and the rotation of the hydraulic motor 3 causes the winch 1 to be hoisted and lowered. Since the locking device 30 is still in the locked state at this time as well, even if the braking by the second braking device 20 ′ is not effective as described above, the locking device 30 prevents undesired rotation of the winch drum 1 in the lowering direction. Certainly blocked.

In the above description, the winch drum 1 and the ring gear 2a are integrated with each other, and the brake drum 5 and the carrier shaft 4 are integrated with each other. On the contrary, the winch drum 1 and the carrier shaft 4 are integrated with each other. May be integrated, and the brake drum 5 and the ring gear 2a may be integrated.

[0033]

According to the present invention, a lock device for engaging the lock claws with the brake drum to prevent the brake drum from rotating in the lowering direction is provided, and the lock device is wound by the hydraulic motor.
Since I tried to activate the locking device when unwinding,
It is possible to prevent the winch from undesirably rotating due to the weight of the suspended load during hoisting and lowering by the hydraulic motor.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a winch control device according to the present invention.

FIG. 2 is a configuration diagram of a winch control device according to another embodiment.

FIG. 3 is a view showing a conventional winch drive mechanism.

FIG. 4 is a view showing a conventional lock device drive mechanism.

[Explanation of reference numerals] 1 winch drum 2 planetary reduction mechanism 3 hydraulic motor 4 carrier shaft 5 brake drum 5a engagement groove 10 brake cylinder (first brake device) 10 'first brake device 20, 20' second brake Device 21 Brake band 25 Brake pedal 26 Brake cylinder 30 Lock device 32 Lock cylinder 41 Operating hydraulic power source 42 Operating lever 43 Pilot valve 44 Directional switching valve 45 Electromagnetic valve 46 Brake mode switching switch 48 Switching valve 90 Manual switching valve 101 Brake band 105 brake pedal 106 brake cylinder 201 brake cylinder 301, 302 switching valve

Claims (2)

[Claims] 1. A hydraulic motor, a planetary speed reduction mechanism that is connected to an output shaft of the hydraulic motor to reduce the rotation of the output shaft, and a winch drum integrated with either a ring gear or a carrier shaft of the planetary speed reduction mechanism. A first braking device that brakes the input side of the planetary reduction mechanism; a brake drum that is integrated with one of the ring gear and the carrier shaft that is separate from the winch drum; and brakes the brake drum. A first brake device is released and the second brake device is in a first state of braking, hoisting and hoisting are performed by a hydraulic motor, and the first brake device is provided. In the control device of the winch, in which a brake is applied and a free fall is performed in the second state where the second brake device is released, the lock is applied to the brake drum. A lock device that engages with the lock drum to prevent the brake drum from rotating in the lowering direction; and when the first state is set, the lock device is activated, and when the second state is set, A control device for a winch, comprising: a control device that brings a lock device into an inoperative state. 2. A hydraulic motor, a planetary speed reduction mechanism connected to the output shaft of the hydraulic motor to reduce the rotation of the output shaft, and a winch drum integrated with either a ring gear or a carrier shaft of the planetary speed reduction mechanism. A first brake device for braking the winch drum, a brake drum that is integrated with one of the ring gear and the carrier shaft that is separate from the winch drum, and a second brake device that brakes the brake drum. A first braking device is released, and a second braking device is in a first state of braking, hoisting and lowering are performed by a hydraulic motor, and the first braking device and the second braking device are provided. In a winch control device in which a free fall is performed in a third state where both brake devices are released, a lock pawl is engaged with the brake drum. And a lock device for preventing the brake drum from rotating in the lowering direction, the lock device being activated when the first state is set, and the lock device being set when the third state is set. A control device for a winch, comprising: a control means for bringing the winch into a non-operating state.