JPH0127956B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operating mechanism for a hydraulically driven winch.

Generally, a hydraulic winch is equipped with a clutch that transmits the driving force of the winch drive motor to the winch drum, and a brake that stops the winch drum from idling.The clutch is turned on and off by lever operation, and the pedal The brake is turned on and off by operation, and the winch is driven, stopped, and switched to freefall.

In this way, in the past, the clutch operating lever and the brake operating pedal had to be operated separately, which made the operation very troublesome, and
If the combination of the two operations is incorrect, a predetermined work cannot be performed, and there is also a risk that the hanging tool, the suspended load, etc. may fall due to the incorrect operation.

In view of these circumstances, the present invention has been developed to enable simultaneous on/off control of the clutch and brake in a predetermined combination with a simple operation using a single lever, and to switch between drive, stop, and free fall of the winch. It can be easily performed, and it can increase safety by enabling neutral automatic braking, and further,
If necessary, it can be temporarily fixed in a freefall state.
The operating mechanism of the hydraulically driven winch reduces operator fatigue, and improves safety by immediately returning to the neutral automatic braking state and stopping the suspended load when the operating lever is even slightly touched in the free-fall state. This is what we provide.

The present invention provides a clutch device that transmits the rotation of a winch drive motor of a hydraulically driven winch to a winch drum, a negative brake device that is biased in a direction to apply the brake to the winch drum and deactivates the brake due to the inflow of pressure oil, and It has a work switching valve that guides pressure oil from an oil source to the clutch device and the negative brake device, and the work switching valve guides the hydraulic oil in the clutch device and the hydraulic oil in the negative brake device to a tank and switches off the clutch. and a neutral position for stopping the winch drum where the brake is turned on; a winch drum drive position where the pressure oil from the pressure oil source is guided to the clutch device and the negative brake device to turn the clutch on and the brake off; and a winch drum drive position where the hydraulic oil in the clutch device is transferred to the tank. The lever support tube can be freely switched between a free fall position where the pressure oil from the pressure oil source is guided to the negative brake device and the brake is turned off, and a lever support tube is rotatable via a pivot on the fixed frame. The support cylinder and the work changeover valve are connected so that the work changeover valve can be switched to the three positions by the rotation of the support cylinder, and the operating lever is slidable in the axial direction on the support cylinder. A pin that is supported and biased in the extension direction by a spring and protrudes from the operating lever is engaged with a guide hole provided in the fixed frame, and this guide hole allows the lever to extend and retract at the lever neutral position. a guide portion that allows rotation from the upper end of the drafting interior and the middle drafting interior to the drum driving operation position;
By means of a guide part that allows rotation from the lower end of the center planning interior to the freefall operating position, and a temporary fixing engagement part that engages and temporarily fixes the pin at the freefall operating position. The invention is characterized in that a neutral return spring is provided that biases the lever in a direction to return the lever from the free fall operating position to the neutral position.

With this configuration, the work switching valve can be operated by a single operating lever into a neutral position for stopping the winch, which turns the clutch off and the brake on, a drum drive position, which turns the clutch off and the brake off, during winch operation, and a free fall position, which turns the clutch off and the brake off. As a result, the clutch and brake are turned on and off in a predetermined combination, and winching, stopping, and freefall operations are performed smoothly. Moreover,
When switching the lever from the neutral position to the free fall position, it is necessary to perform a two-step operation in which the lever is once pushed against the spring and then rotated against the neutral return spring. A resistance force is applied by each spring, so that the operator can sense the free fall state via the lever and operate the lever safely. Furthermore, when you take your hand off the lever, i.e. when no operation is performed, the lever automatically returns to the neutral position and the brake is turned on, and the lever is held in the neutral and brake-on state to ensure that suspended loads, etc., do not fall. is prevented. In addition, when extending or retracting the jib, the winch drum can be set free to let out the wire, inspect the winch drum, adjust the brake band, or as necessary. By engaging the pin with the temporary fixing engaging portion and temporarily fixing, the operability and workability of other operations are improved. Also, in this freefall temporary state,
With just a light touch of the lever, the vehicle automatically returns to the neutral position and turns on the brakes, making it possible to stop in an emergency and improving safety.

The description will be given below based on the drawings.

FIG. 1 shows an example of a hydraulic circuit to which the operating mechanism of the present invention is applied. In the same figure, P ₁ is a first pump, and a first relief valve 11 is connected to its discharge circuit 10.
A pilot valve 12 for merging surplus oil from other actuator circuits such as boom elevation of a hydraulic crane, and a winding direction switching valve 1 for switching the rotational direction of the winch drive motor M, that is, the winding direction.
3 to the two-sided circuit 14, 15 of the motor M and the discharge circuit 1 to the tank T via a first control valve V ₁ with
6 are switchably connected. Winding direction switching valve 1
3 can be freely switched from a neutral position 13a to a hoisting position 13b and a hoisting down position 13c, and is equipped with an operating lever 13d for switching, and automatic return springs 13e and 13f for holding the neutral position 13a. There is. 17 is a counter balance valve, 18,1
9 indicates a pilot circuit.

P ₂ is a second pump, and its discharge circuit 20 includes:
A check valve 21, a second relief valve 22, a main winding work switching valve 23, an auxiliary winding work switching valve 23',
a second control valve V ₂ equipped with a pilot switching valve 24;
Clutch circuits 31, 3 of clutch devices 30, 30' transmit the driving force of the motor M to the winch drums 50, 50' for main winding and auxiliary winding through
1', brake circuits 41, 41' of negative brake devices 40, 40' which brake the idling of the respective drums 50, 50', and a discharge circuit 25 to the tank T are switchably connected.

Each work switching valve 23, 23' controls each clutch device 30, 30' for main winding and auxiliary winding and each negative brake device 40, 40' on and off to drive each winch drum 50, 50'. , stop, and freefall, and includes winch stop neutral positions 23a, 23'a, winch working positions 23b, 23'b, and freefall position 23.
c, 23'c, and is switched by an operating mechanism such as operating levers 80, 80', which will be described later, and automatic return springs 23e, 23'e.
The vehicle is automatically returned from the freefall position to the neutral position and held at the neutral position. 26 is an auxiliary circuit, and 27 is an accumulator.

In addition, 60 is a positive brake device for the main winding,
Reference numeral 60' denotes a positive brake device for auxiliary winding, which is composed of an independent hydraulic circuit separate from the clutch circuits 31, 31' and negative brake circuits 41, 41', and is connected to the brake pedals 61, 6, respectively.
1' of pedal force is transmitted to the brake cylinder via master cylinders 62, 62'.
63, 63' are positive brake pressure oil sources, 6
4 indicates a supply tank. This pressure oil source 63,6
3' may be led from the drain circuit, in which case the supply tank 64 can be omitted.

Next, the operating mechanisms of the main winding work switching valve 23 and the auxiliary winding work switching valve 23' will be explained based on FIGS. 2 to 4. However, the operating mechanisms of the main winding system and the auxiliary winding system have the same structure, so the main winding system will be explained here, and the parts of the auxiliary winding system that are the same as the main winding system will be denoted with the same reference numerals followed by "'". It is shown in the drawings and will be explained below as necessary.

2 to 4, a fixed frame 70 provided on one side of the cockpit (not shown) is provided with a horizontal pivot 72 extending in the left-right direction via a bearing member 71. The cylinder shaft 81 is externally supported so as to be rotatable in the front-rear direction, and a connecting shaft 83 extends along the front-rear direction on a connecting part 82 protruding from the cylinder shaft 81.
A lever support tube 84 is connected to the lever support tube 84 so as to be rotatable in the left-right direction.

The operation lever 80 is slidably inserted into the lever support tube 84 in the axial direction while protruding upward from a window hole 73 provided in the fixed frame 70, and is extendable and retractable. hole 73
It is freely rotatable in the front and back direction along the neutral position 80a.
The winch operation position 80b can be changed from the rear to a winch operation position 80b and a freefall operation position 80c to the front. Further, the lever 80 can be tilted to one side, for example, to the left, about the connecting shaft 83 at a free fall operating position 80c, and the lever 80 is placed in a free fall position on one side of the front end of the window hole 73. Engagement part 7 for holding at operating position 80c
4 is provided.

A pin 85 is provided protruding from the lever 80, and the pin 85 is engaged with a long hole 86 provided in the support tube 84 and a guide hole 75 provided in the bearing member 71, thereby preventing the lever 80 from sliding. The range of movement (expansion/contraction) and the range of rotation are restricted, and the lever 80 is biased in the protrusion (extension) direction by a spring 87 provided within the support tube 84 . The guide hole 75 has a vertically elongated centrally extending interior 75a along the radial direction of the pivot shaft 72 at the lever neutral position 80a, and a guide portion 75b extending in an arc shape from the upper end of the guide portion 75a toward the rear winch operation operation position 80b. and a free fall operation position 80c in front of the lower end of the guide portion 75a.
The guide portion 75c extends in an arc shape toward the guide portion 75c, and is formed into a substantially Z-shape or a substantially S-shape. Note that the pin 8 provided on the auxiliary winding operation lever 80'
The guide hole 5' has the same shape as the guide hole 75, and is provided in the partition wall 71' provided between the bearing members 71, 71.

On the other hand, an arm 88 is provided protruding from the cylindrical shaft 81, and a spool of the work switching valve 23 is connected to the arm 88 via a control cable 89. 76 is a control cable support bracket.

Reference numeral 91 denotes an intermediate cylinder shaft, which is rotatably supported externally on the pivot shaft 72, and one of the pair of intermediate arms 92 and 93 fixed and protruded from the intermediate cylinder shaft 91.
3 and a spring hanging member 77 protruding from the bearing member 71
A spring 94 is tensioned between the intermediate arms 92 and 93, and the intermediate arms 92, 93 are urged to rotate clockwise in FIG. Further, a horizontal rod 95 is fixedly and protrudingly provided perpendicular to the back surface of the intermediate arm 93, and this horizontal rod 95 comes into contact with the back surface of the arm 88 connected to the lever 80, so that when the lever 80 is tilted forward, Then, the rotational force is transmitted from the arm 88 to the horizontal rod 95 and the intermediate arm 93, and the spring 94
It has come to be subject to resistance from Also,
The intermediate arm 92 is in the neutral position, and its back surface is in contact with the stopper bolt 79 provided on the bearing member 71 via the fixing bar 78 by the force of the spring 94, and the intermediate arms 92 and 93 are rotated rearward from the neutral position. The lever 80 is prevented from moving by the spring 94.
prevents the body from falling naturally backwards due to the force of the
Further, when the lever 80 is pushed backward, the intermediate arms 92 and 93 are kept stationary so that the lever 80 can be freely operated without being affected by the spring 94.

Numerals 96a and 96b are lock pins for locking the lever 80 in the neutral position, and are supported by cylindrical brackets 97a and 97b provided on the fixed frame 70 so as to be freely forward and backward and rotatable.
The lock pin 9 is locked by the engagement of the photographing tools 98a, 98b protruding from the cylindrical bracket 96b with the U-shaped engagement holes 99a, 99b provided in the cylindrical brackets 97a, 97b.
6a, 96b can be changed between a lever lock position and a lock release position. Note that the lock pins 96a and 96b may be omitted.

Next, the effect will be explained.

First, when no operation is performed, the winding direction switching valve 13 is held in the neutral position by springs 13e and 13f as shown in FIG. 1, and the oil discharged from the first pump _P1 is directed in the direction of arrow _A1. He was led back to Tank T,
Motor M is stopped. At this time, since no pressure is introduced into the pilot circuits 18, 19, the pilot switching valve 24 is held at the neutral position 24a.

On the other hand, the main winding and auxiliary winding operation switching operation levers 80, 80' are each urged upward by a spring 87 (one not shown), as shown by solid lines in FIGS. 2 to 4. Pins 85, 85' are located at the upper end of the centering inner part 75a of each guide hole 75 (one not shown), and the levers 80, 80' are located at the upper end of the inner part 75a of each guide hole 75 (one not shown), and the levers 80, 80' are located in the lock pins 96a, 96b, 96'a, 96'b. Neutral position 8 without falling forward or backward.
It is held at 0a, 80'a. Along with this, each work switching valve 23, 23' is also placed in the neutral position 23a, 2
3'a, so that each clutch device 3
0, 30' and the hydraulic oil in each negative brake device 40, 40' are guided in the direction of arrows A ₂ , A ₂ ' and in the direction of A ₃ , A ₃ ' and returned to tank T. The devices 30, 30' are clutched off, the negative brake devices 40, 40' are automatically braked on by their own spring force, and each winch drum 50, 50' is prevented from idling, and the lifting equipment and the suspended load are etc. is maintained in a stopped state.

Note that when the winch drums 50, 50' are stopped, the oil discharged from the second pump _P2 is guided in the direction of arrow _A4 , flows into the accumulator 27 and is accumulated in pressure, and after a predetermined pressure is accumulated in the accumulator 27, , the discharged oil is returned to the tank T via the second relief valve 22.

Next, when winding the main winder, first press the lock pin 96 at the rear of the lever using the camera tool 98b.
b, and pull down the work switching operation lever 80 backward to switch to the winch work operating position 80b, thereby switching the work switching valve 23 to the winch working position 23b. At this time, the lever 80 is in an extended state at the neutral position 80a, and the pin 85 is at the upper end of the centrally extending interior 75a of the guide hole 75, so if the lock pin 96b is retreated, the lever 80
Simply tilt the pin backward while it is extended, and the pin 85
can be smoothly moved into the rear guide portion 75b and the lever 80 can be easily switched to the position 80b, and the work switching valve 23 can be moved to the winch work position 23b.
can be easily switched to.

As a result, the oil discharged from the second pump _{P2 is}
direction, flows into the clutch device 30 and is clutched. However, since the winding direction switching valve 13 is initially at the neutral position 13a at this time, pressure oil is not supplied to the motor M, and since the pressure on the inflow side of the motor M is low pressure, the pilot switching valve 2
4 is in the neutral position, and therefore, the hydraulic oil in the negative brake device 40 is guided in the _two directions of arrow B and released into the tank T, and the brake device 40 is in the brake-on state by its own spring force. , and the winch drum 50 is held in a stopped state.

After that, the winding direction switching valve 13 is turned on by lever 13d.
When switched to the winding position 13b, the first pump
The oil discharged from _P1 is guided in the direction of arrow _B3 and flows into the motor M, and the pressure on the inflow side of the motor M gradually rises. When the pressure exceeds a predetermined pressure, the pressure is transferred from the circuit 14 to the pilot circuit 18. arrow through
_B , the pilot switching valve 24 is switched to the right position 24b, and along with this, the second
The oil discharged from the pump _P2 is guided in the direction of arrow _B1 and the direction of arrow _B5 , flows into the clutch device 30 and engages the clutch, and flows into the negative brake device 40 to turn off the brake, causing the motor M to move in the winding direction. The rotating force is transmitted to the winch drum 50 via the power transmission mechanism 51 and the clutch device 30, and the drum 50 rotates in the winding direction.
Winding work of the main volume is performed. At this time, the inching operation is performed by adjusting the stroke of the lever 13d. Note that the oil discharged from the motor M is guided in the direction of arrow _B6 and returned to the tank T.

When temporarily stopping the main winding work mentioned above,
What is necessary is to return the winding direction switching valve 13 to the neutral position 13a. As a result, the supply of pressure oil to the motor M is stopped, the motor M is stopped, and the pressure on its inflow side becomes low pressure, so the pilot switching valve 24 is returned to the neutral position 24a, and the clutch device 30 is thereby returned to the neutral position 24a. Subsequently, pressurized oil is introduced to turn the clutch on, but the hydraulic oil in the negative brake device 40 is guided in the _two directions of arrow B and the brake is immediately turned on, thereby stopping the winch drum 50. .

When lowering the main hoist, the work switching valve 23 is held at the winch working position 23b, and the winding direction switching valve 13 is moved to the lowering position 13c.
All you have to do is switch to .

In addition, after the winch work is completed, after returning the winding direction switching valve 13 to the neutral position 13a, the work switching valve 2
3 to the neutral position 23a. In this case, the operation lever 80 of the work switching valve 23 is returned to the neutral position 80a while remaining in the extended state.
At this point, the pin 85 hits the upper end of the inner part 75a of the guide hole 75, and the lever 80 locks the lock pin 96a.
Therefore, the lever 80 does not move too far forward to the freefall side and remains at the neutral position 80.
The winch drum 50 is reliably stopped once at the point a, the work switching valve 23 is also reliably stopped once at the neutral position 23a, and the stopped state of the winch drum 50 is reliably maintained.

Next, when performing a free fall of the main winding, the winding direction switching valve 13 is held at the neutral position 13a and the motor M is stopped, the lock pin 96a is moved back using the camera 98a, and the lever 80 is moved. At the neutral position 80a, push down against the spring 87 to shorten it, and then push it forward to move to the free fall operating position 8.
By switching to 0c, the work switching valve 23 is switched from the neutral position 23a to the free fall position 23c. As a result, the oil discharged from the second pump _P2 is guided in the direction of arrow _C1 , flows into the negative brake device 40 and turns off the brake, and the hydraulic oil in the clutch device 30 is guided in the direction of arrow _C2 . It is returned to the tank T, the clutch is off, and the hanging tools, hanging loads, etc. freely descend while causing the winch drum 50 to idle due to their own weight.

When switching to this freefall, lever 80
At the neutral position 80a, the lever 80 must be pushed down once against the spring 87 to shorten it, and then pushed forward to switch, and when pushed forward, the arm 88 connected to this lever 80 hits the horizontal rod 95 , this horizontal rod 9
5, the intermediate arm 93 is rotated counterclockwise against the spring 94. Therefore, when switching this freefall, the operator must maintain the shortened state of the lever 80 and the springs 87 and 94.
You can sense the resistance force through your hands, and for this reason, you will inevitably have to switch carefully.
There is no risk of incorrect operation. Further, during normal freefall work, the lever 80 is simply pushed forward, but the lever 80 is not tilted to one side after that. Therefore, in order to continue this freefall, It is necessary to hold the lever 80 in the freefall operation position 80c against the spring 94, and if the operator releases the lever 80 at this switching position 80c, the springs 94, 87 The lever 80 and the work switching valve 23 are automatically returned to the neutral position by the spring 23e, the negative brake device 40 is automatically turned on, and the winch drum 5 is automatically turned on.
0 is stopped and there is no risk of suspended loads etc. falling unexpectedly. In this case, the spring 94 is omitted and the work switching valve 2
By the spring 23e attached to the work selector valve 2
3 and the lever 80 may be returned to the neutral position.

By the way, in a hydraulic crane, when the boom is extended or the jib is extended, the hook is hoisted up, so it is necessary to free the winch drums 50, 50' to let out the wire and lower the hook. Furthermore, when inspecting the winch drums 50, 50', adjusting the brake band, etc., it is necessary to free the winch drums 50, 50'. In such a case, the main volume above (same for the supplementary volume)
, after pushing the lever 80 forward to switch to the free fall operating position 80c, push the lever 80 to the left side to engage the temporary fixing engagement portion 74 on one side of the front end of the window hole 73. All you have to do is engage and temporarily fix it. In this way, even if the lever 80 is released, the lever 80 remains engaged with the engaging portion 74 and is not returned to the neutral position 80a by the spring 94, but instead returns to the freefall operation position 80c.
is held in the left position. This allows you to perform a total of three tasks at the same time by operating the other two operating levers with both hands while freefalling the main hoist, leaving the winch drum free to extend the boom, extend the jib, and extend the drum. This greatly improves work efficiency when performing brake band inspection, brake band adjustment, and other maintenance. In addition, if an emergency situation occurs during this work, simply pushing the lever 80 to the right causes the lever 80 to disengage from the engaging portion 74 and immediately return to the neutral position 80a by the spring 94, and the brake is automatically applied. Can be applied.

In addition, when stopping the freefall in the middle of the above-mentioned freefall work, the brake pedal 61 of the positive brake device 60
Stop the suspended load by stepping on the brake and turning on the brake. Note that by returning the work switching valve 23 to the neutral position using the lever 80, the brake of the negative brake device 40 may be turned on and stopped. After the free fall operation is completed, the stopped state can be completely maintained by holding the lever 80 at the neutral position 80a.

When driving, stopping, and freefalling the auxiliary winding, operate the lever 80' and the lever 13'd to switch the auxiliary winding work switching valve 23' and the winding direction switching valve 1.
3d may be switched in the same manner as in the main winding.

5 to 7 show another embodiment of the invention. In FIGS. 5 to 7, parts that are the same as those shown in FIGS. 2 to 4 are denoted by the same reference numerals, and the explanation thereof will be omitted, and only the differences will be explained below. Also, in this embodiment, the operating mechanisms of the main winding system and the auxiliary winding system have the same structure, so only the main winding system will be explained here. Illustrated below,
Explain if necessary.

That is, in this embodiment, the fixed frame 70
At the front end of the window hole 73 provided in the bearing member 71, the engaging portion 74 shown in FIG. Guide to Foor 7
A temporary locking engagement portion 75d for temporarily locking the lever 80 at the free fall operating position 80c is provided on the upper surface of the front end portion of the lever 5c. In addition, in this embodiment, since it is not necessary to tilt the lever 80 in the left-right direction, the lever support tube 84 is fixed to the tube shaft 81.

In this embodiment, during normal free fall work, after the lever 80 is pushed in at the neutral position 80a, the lever 80 is pushed forward against the spring 94, and the lever 80 is moved toward the window. The lever 8 is stopped at a position before it hits the front end of the hole 73 and before the pin 85 reaches the front end of the guide portion 75c.
By holding the 0 in the hand and performing the freefall, the operator can carefully perform the freefall work while holding it in the hand while intuitively being aware of the freefall state, as in the above embodiment, and If you let go of the lever 80 at this position, the lever 80
0 is automatically returned to neutral by the spring 94 and the brake can be turned on.

In addition, when performing free fall and other work at the same time, push down the lever 80 to the front end of the window hole 73, move the pin 85 to the front end of the guide portion 75c, and then release the lever 80. , the lever 80 is extended by the spring 87, the pin 85 engages with the engaging portion 75d, and the lever 80 is stopped and held at the freefall operating position 80c, thereby maintaining the freefall state. However, you can freely operate other control levers with both hands.

Incidentally, in the above embodiment, the winch drums 50, 50' for the main winding and the auxiliary winding are configured to be driven by the same motor M, but they may be driven by separate motors, and the winch drums 50, 50' for the auxiliary winding May be omitted.

As explained above, according to the present invention, both the clutch and brake of the winch can be easily controlled on and off in a predetermined combination by operating the lever of one work switching valve, and the winch can be driven, stopped, and Free fall control can be easily performed. In particular, when operating the lever, a resistance force is applied when switching to freefall, so the operator can intuitively be aware of the freefall state by holding it in his/her hand, and can switch carefully. There is no risk of switching to full, and when you let go of the lever, it will automatically return to neutral and turn on the brake, and the winch drum can be automatically stopped, so there is no risk of suspended loads falling, and safety is maintained. You can improve.

Furthermore, the lever can be stopped and held in the free fall operating position if necessary.
This retention allows you to freely operate other control levers with both hands, and while performing free fall, you can also perform two other operations at the same time, improving operability and workability during operations such as extending the boom and extending the jib. In addition to greatly improving performance, maintenance such as drum inspection and brake band adjustment can be easily performed. In addition, in this free-fall temporarily fixed state, simply touching the lever will immediately release the temporary stop, automatically return to the neutral position, and turn on the brake, making it possible to stop in an emergency, thereby increasing safety. You can improve.

[Brief explanation of drawings]

FIG. 1 is a hydraulic circuit diagram showing an example of a hydraulically driven winch to which the operating mechanism of the present invention is applied, and FIG. 2 is a partially cutaway side view showing an embodiment of the operating mechanism of the present invention.
3 is a plan view thereof, FIG. 4 is a partially sectional rear view thereof, FIG. 5 is a partially cutaway side view showing another embodiment of the present invention, FIG. 6 is a plan view thereof, and FIG. The figure is a partially sectional rear view. P ₁ ...First pump, _P2 ...Second pump, M...
...Winch drive motor, T...Tank, 13...
Winding direction switching valve, 23... Main winding work switching valve, 2
3'...Auxiliary winding work switching valve, 23a, 23'a...
Neutral position, 23b, 23'b...Winch working position, 23c, 23'c...Free fall position,
30... Clutch device for main winding, 30'... Clutch device for auxiliary winding, 40... Negative brake device for main winding, 40'... Negative brake device for auxiliary winding, 50... Winch drum for main winding, 50 ′...
Winch drum for auxiliary hoisting, 70...Fixed frame,
71...Bearing member, 72...Pivot, 73, 73'
... Window hole, 74, 74' ... Engagement part, 75 ... Guide hole, 75a, 75b, 75c ... Guide part, 75
d...Engaging portion, 80...Operating lever for switching main winding work, 80'...Operating lever for switching auxiliary winding work, 80
a, 80'a...neutral position, 80b, 80'b...
Operation position for winch work, 80c, 80'c...
Freefall operation position, 81, 81'...Cylinder shaft, 82, 82'...Connection part, 83, 83'...Connection shaft, 84, 84'...Lever support cylinder, 85, 8
5'...Pin, 88, 88'...Arm, 89,8
9'...Control cable, 94...Spring.

Claims (1)

[Claims] 1. A clutch device that transmits the rotation of a winch drive motor of a hydraulically driven winch to a winch drum;
It has a negative brake device that is biased in the direction of applying the brake to the winch drum and turns off the brake due to the inflow of pressure oil, and a work switching valve that guides the pressure oil from the pressure oil source to the clutch device and the negative brake device. , the work switching valve has a neutral position for stopping the winch drum, which guides the hydraulic oil in the clutch device and the hydraulic oil in the negative brake device to the tank to turn off the clutch and turn on the brake, and a neutral position for stopping the winch drum, which directs the hydraulic oil in the clutch device and the hydraulic oil in the negative brake device to the tank, and a neutral position for stopping the winch drum, which directs the hydraulic oil in the clutch device and the hydraulic oil in the negative brake device to the tank, and a neutral position for stopping the winch drum. and a winch drum drive position where the clutch is turned on and the brake is turned off by guiding it to the negative brake device, and a free position where the hydraulic oil in the clutch device is led to the tank and the clutch is turned off, and pressure oil from the pressure oil source is led to the negative brake device and the brake is turned off. The lever support tube is rotatably supported on the fixed frame via a pivot shaft,
The support cylinder and the work changeover valve are connected so that the work changeover valve can be switched to the above three positions by rotation of the support cylinder, and the operating lever is supported by the support cylinder so as to be slidable in the axial direction. a pin protruding from the operating lever is engaged with a guide hole provided in the fixed frame, and the guide hole allows the lever to extend and retract at the lever neutral position; A guide part that allows rotation from the upper end of the inside of the middle planning to the operating position for driving the drum, a guide part that allows rotation from the lower end of the inside of the middle planning to the operating position for freefall, and a guide part that allows rotation of the inside of the middle planning to the operating position for freefall, and the operation for freefall. and a temporary fixing engagement part that engages and temporarily fixes the pin at the position, and a neutral return spring that biases the lever in the direction of returning the lever from the freefall operating position to the neutral position. An operating mechanism for a hydraulically driven winch, characterized in that: