JPH08245173A - Winch interlocking control circuit of lumber yarder - Google Patents

Abstract

PURPOSE: To make improvements in controllability and yarding efficiency by making the interlocking operation of plural units of winches so as to be simply transmitted by one operating lever. CONSTITUTION: When an interlocking switch 34 is turned to ON, a winding side pilot line 21a of a first main valve 11A of a first winch 51 and an unwinding side pilot line 22b of a second main valve 11B of a second winch 61 both are interconnected to each other, and in this state intact, if an operating lever 12a of the first winch 51 is operated, the first winch 51 is driven for winding, and the second winch 61 is driven for unwinding as synchronizing with the speed of the first winch 51.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winch interlocking control circuit used in a forestry work vehicle, a collecting machine or the like.

[0002]

2. Description of the Related Art A conventional method of interlocking two winches of a collecting machine will be described with reference to FIGS. First, a method for transferring the timber felled at one of the collecting bases to the other collecting base will be described with reference to FIG. The first winch 50 and the second winch 60 and the pulley 41 are provided at one of the collecting bases.
The gathering machine 40 having the above is stopped, and the pulley 42 is installed on the standing tree 43 of the other gathering base. The wire rope 4b extending from the second winch 60 of the gathering machine 40 passes through the pulleys 41 and 42 and is fixed to one end of a suspender 44 for suspending the wood 45. The wire rope 4a extending from the first winch 50 of the gathering machine 40 passes through the pulley 41 and is fixed to the other end of the suspender 44. By winding the wire rope 4a with the first winch 50 while unwinding the wire rope 4b from the second winch 60, the lumber 45 hung on the suspenders 44 is transferred from one collecting base to the other collecting base. I am doing so.

Next, two winch control circuits will be described with reference to FIGS. First winch 50 and second
The winch 60 mounts the hydraulic motors 1a and 1b on the pedestal 30, and outputs the output shafts 2a and 2b of the hydraulic motor devices 1a and 1b.
Attach the drums 3a and 3b to the hydraulic motors 5A and 5B
By the forward and reverse rotation of the wire rope 4 to the drum 3a, 3b
A and 4b are rolled in and rolled out.
The hydraulic motors 1A and 1b include hydraulic motors 5A and 5A,
B, counter balance valves 6a, 6b, brake valve 7a,
7b, brakes 8a and 8b, safety valves 9a and 9b, speed reducers 10a and 10b, etc. are integrally incorporated.

The hydraulic motor devices 1a and 1b are provided with a main valve 11
It is connected to A and 11B. The main valves 11A, 11B are switched by the pilot pressure output from the pilot valves 13A, 13B operated by the operating levers 12a, 12b. The main valves 11A and 11B are opened according to the operation amounts of the operation levers 12a and 12b, and the main pump 14
The pressure oil discharged from a and 14b is hydraulic motor device 1a, 1
Then, the counter balance valves 6a and 6b and the brake valves 7a and 7b are operated to release the brakes 8a and 8b, and the hydraulic motors 5A and 5B are rotated.

The pilot valves 13A and 13B generate pilot pressures corresponding to the operation amounts of the operating levers 12a and 12b, and the winding side pilot circuits 21a and 21a of the main valves 11A and 11B.
21b and the unwinding side pilot circuits 22a and 22b, and the pilot pump 31 outputs pressure oil to the pilot valve 13
a, 13b. 32 is a relief valve.

When the operation lever 12a of the first winch 50 is operated to the winding side in order to drive the first winch 50 to be wound, the pilot pressure output from the winding side pipe line 13a of the pilot valve 13A is wound into the main valve 11A. It acts on the side operation portion 11a, the main valve 11A is switched to the winding side, and the pressure oil is supplied to the hydraulic motor 5A to be rotationally driven and the first winch 50 is rotationally driven.

When the operation lever 12B of the second winch 60 is operated to the unwinding side in order to drive the second winch 60 to unwind, the pilot pressure output from the unwinding side conduit 13b of the pilot valve 13B becomes the main valve. It acts on the unwinding side operation portion 11d of 11B, the main valve 11B is switched to the unwinding side, the pressure oil is supplied to the hydraulic motor 5B and rotationally driven, and the second winch 60 is unwinding driven.

When the two winches 50 and 60 are interlocked with each other, two winches 50 and 60 are operated so that when one winches, the other winches. The operation levers 12a and 12b are operated simultaneously.

Further, there is also a method in which a synchronous drum is separately installed in the interlocking operation of the two winches 50 and 60 and the interlocking system is used.

[0010]

In the interlocking operation of the two winches, the winding diameter of the drum is constantly increasing because one winch is involved and the winding diameter of the drum is unwinding because the other winch is unwinding. Is getting smaller every moment. Since the line speed of the wire rope is the same for both winches, the two operating levers are skillfully operated to change the rotation speed of both drums momentarily to control the wire rope so that it does not become loose or too tight. There is a need. However, there is a problem that it is difficult to operate the two operation levers skillfully because it requires a high degree of skill.

Further, the method of separately installing the synchronous drum has a problem that many parts are required and the structure is complicated and expensive.

The present invention focuses on the above-mentioned conventional problems, and makes it possible to easily perform interlocking operation of a plurality of winches with a single operating lever, thereby improving operability and improving the efficiency of collecting materials. It is an object of the present invention to provide an interlocking control circuit.

[0013]

In order to achieve the above object, a winch interlocking control circuit of a first lumber logging machine according to the present invention stops a logging machine having a winch at one of the logging bases. , A pulley installed on the other base, and a wire rope was wound between the pulley and the winch, and the felled timber was transferred to the logging base via the wire rope. In the circuit, the winch has a first winch system and a second winch system, an interlocking switch 34 for issuing an interlocking command to the first winch system and the second winch system, and the first winch. And a first main valve 11A and a second main valve 11B for switching the direction of pressure oil of the second winch, and first pilot lines 21a and 22a connected to the first main valve 11A and the second main valve 11B.
In addition, the signals from the interlocking switch 34 and the second pilot conduits 21b and 22b are used to receive the first pilot conduit 2
1a, 22a and interlocking valves 25a, 25b that connect the second pilot conduits 21b, 22b are provided, and when either the first or the second winch system is driven to the winding side, the winch system on the opposite side is set. The configuration is composed of a first main valve 11A and a second main valve 11B that are switched so as to be driven to the unwinding side.

The winch interlocking control circuit of the second lumber shaving machine according to the present invention has at least first and second winch systems, and each winch system has hydraulic motors 5A and 5B mounted on the mounts. The hydraulic motors 5A, 5B
Drums 3a and 3b are attached to the output ends of the hydraulic motors 5A and 5B, and the discharge oils from the main pumps 14a and 14b are supplied to and discharged from the hydraulic motors 5A and 5B. Main valves 11A and 11B for winding or unwinding the wire rope on 3b, and the main valve 11
Pilot lines 21a, 22a, 21b on A and 11B,
A pilot valve 13A, 13B for guiding pressure oil from the pilot pump 31 connected by 22b is provided, a communication conduit for short-circuiting the inlet conduit and the outlet conduit of the hydraulic motors 5A, 5B, and a command of the interlock switch 34. The communication valves 27a and 27b for opening and closing the communication pipe and the pilot valves on the winding side of the main valves 11A and 11B of the first and second winch systems are operated by the first command of the interlock switch 34.
And hydraulic switches 29a and 29b for transmitting to the communication valves 27a and 27b of the second winch system.

Further, the winch interlocking control circuit of the third lumber shaving machine according to the present invention has at least first and second winch systems, and each winch system has hydraulic motors 5A and 5B mounted on the mounts. The hydraulic motors 5A, 5B
Drums 3a and 3b are attached to the output ends of the drums 3a and 3b, the oil discharged from the main pumps 14a and 4b is supplied to and discharged from the hydraulic motors 5A and 5B, and the drums 3a and 5b are rotated by forward and reverse rotations of the hydraulic motors 5A and 5B. Main valves 11A and 11B for winding or unwinding a wire rope on 3b, and main valves 11A and
11B includes pilot lines 21a, 22a, 21b, 22
The pilot valves 13A and 13B for guiding the pressure oil from the pilot pump 31 connected by b are provided, and the entrainment side pilot conduits 21a and 21b of the main valves 11A and 11B of the first and second winch systems and the first and second The interlocking pipeline that connects the unwinding-side pilot pipelines 22a and 22b of the main valves 11A and 11B of the second winch system via the shuttle valves 23a and 23b, and the interlocking pipeline is opened / closed by an instruction of the interlock switch 34. Interlocking valves 25a and 25b to perform,
The communication conduits that short-circuit the inlet conduits and the outlet conduits of the hydraulic motors 5A and 5B, the communication valves 27a and 27b that open and close the communication conduits in response to a command from the interlock switch 34, and the first and second winch systems. The main valves 11A and 11B are operated by the pilot pressure on the winding side, and the command of the interlocking switch 34 is transmitted to the communication valves 27a and 27b of the first and second winch systems.
And a hydraulic switch 29a, 29b for transmission to the.

Further, in the above structure, fixed or variable throttle valves 28a and 28b are provided in the communication conduit.

[0017]

According to the configuration of the first winch interlocking control circuit, when the interlocking switch is turned on to interlock the first and second winches, the interlocking valve operates and the first winch interlocking control circuit operates.
Alternatively, the winding side pilot circuit of the second winch main valve communicates with the unwinding side pilot circuit of the second or first winch main valve. When the operation lever of the first winch is operated to the winding side in this state, pilot pressure acts on the winding side of the main valve of the first winch and the unwinding side of the main valve of the second winch, and the first winch is driven to be wound. At the same time, the second winch is driven to be unwound. The above description is for the case of operating the operation lever of the first winch, but the same applies to the case of the operation lever of the second winch.

According to the configuration of the second winch interlocking control circuit, when the interlocking switch is turned on in order to interlock the first and second winches, the communication valve is energized after the hydraulic switch is actuated. become. First in this state
When the operation lever of the winch is operated to the winding side, pilot pressure acts on the winding side of the main valve of the first winch, and the first winch is driven to be wound. At the same time, this pilot pressure actuates the hydraulic switch of the first winch,
The communication valve of the second winch is energized. As a result, the inlet pipe line and the outlet pipe line of the hydraulic motor of the second winch communicate with each other, and the drive of the second winch becomes free. However, due to the action of the throttle valve, the first winch is pulled with a certain tension and is freely wound. Will be issued. The above description is for the case of operating the operation lever of the first winch, but the same applies to the case of the operation lever of the second winch.

According to the configuration of the third winch interlocking control circuit, when the interlocking switch is turned on to interlock the first and second winches, the interlocking valve operates,
The unwinding side pilot circuit of the first or second winch main valve and the unwinding side pilot circuit of the second or first winch main valve communicate with each other. At the same time, the hydraulic switch is activated to energize the communication valve. When the operating lever of the first winch is operated to the retracting side in this state, pilot pressure acts on the retracting side of the main valve of the first winch and the unwinding side of the main valve of the second winch, and the first winch is driven to retract. At the same time, the second winch is driven to be unwound. At the same time, this pilot pressure actuates the hydraulic switch of the first winch to energize the communication valve of the second winch. As a result, the inlet pipe line and the outlet pipe line of the hydraulic motor of the second winch communicate with each other, so that the second winch tends to be unrolled and driven at a lower rotation speed than the first winch. It is pulled out by the first winch and driven to unwind. The above description is for the case of operating the operation lever of the first winch, but the same applies to the case of the operation lever of the second winch.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of a winch interlocking control circuit according to the present invention will be described below with reference to the drawings. Figure 4 in this
The same parts as those in FIG. 6 are designated by the same reference numerals in the following description.

An embodiment of a first winch interlocking control circuit according to the present invention will be described with reference to FIGS. In the first and second winch systems 51 and 61, the hydraulic motor devices 1a and 1b are attached to the gantry 30, and the drums 3a and 3b are attached to the output shafts 2a and 2b of the hydraulic motor devices 1a and 1b. By rotating the motors 5A and 5B forward and backward, the drums 3a and 3b are rotated.
The wire ropes 4a and 4b are wound around and unwound. The hydraulic motor devices 1a, 1b include hydraulic motors 5A, 5B, counter balance valves 6a, 6b, brake valves 7a, 7b, brakes 8a, 8b, safety valves 9a,
9b, speed reducers 10a, 10b, etc. are integrally incorporated. The hydraulic motor devices 1a and 1b are connected to the first main valve 11A and the second main valve 11B. This first main valve 11A, second
The main valve 11B is switched by the pilot pressure output from the pilot valves 13A and 13B operated by the operation levers 12a and 12b, and the operation levers 12a and 12b are operated.
The main pumps 14a, 14b with the amount of pressure oil corresponding to the operation amount of
To the hydraulic motor devices 1a and 1b.

The pressure oil discharged from the main pumps 14a and 14b is counterbalance valves 6a and 6b and the brake valve 7.
a, 7b are operated to release the brakes 8a, 8b, and the hydraulic motors 5A, 5B are rotated.

The pilot pump 31 supplies pilot pressure to the pilot valves 13A and 13B. These pilot valves 13A and 13B act on the operating portion 11a of the first main valve 11A from the pipe line 13a through the pipe line 21a, and the pilot pressure corresponding to the operation amount of the operation levers 12a and 12b to the winding side is applied. The pilot pressure acts on the operating portion 11c of the second main valve 11B from the conduit 13c via the conduit 21b. The pilot pump 31 is connected to the pilot valves 13A and 13B, and the pilot valves 13A and 13B are connected to the operating lever 12
The pilot pressure corresponding to the operation amount of the a and 12b toward the unwinding side acts on the operating portion 11b of the first main valve 11A from the pipe line 13b through the pipe line 22a, and this pilot pressure is supplied from the pipe line 13d. It acts on the operating portion 11d of the second main valve 11B via 22b. 32 is a relief valve.

The shuttle valve 2 is provided in the unwinding side pilot pipelines 22a and 22b of the first main valve 11A and the second main valve 11B.
3A and 23B are provided. The shuttle valve 23A is connected to the pilot valve 13A via the pipe line 13b, is connected to the operating portion 11b of the first main valve 11A via the pipe line 22a, and is connected to the interlocking valve 25b via the pipe line 24b. Connected. The shuttle valve 23B is connected to the pilot valve 13B via the 13d, is connected to the operating portion 11d of the second main valve 11B via the pipe 22b, and is connected to the interlocking valve 25a via the pipe 24a. .

The interlocking valves 25a and 25b are electromagnetic two-position valves, and the interlocking conduits 24a and 24b are opened and closed by turning on and off the interlocking switch 34. The interlock switch 34 is connected to the battery 35.

Next, the operation will be described. When the interlocking switch 34 is turned on to operate the first and second winches 51 and 61 in an interlocking manner, the interlocking valves 25a and 25b.
Is operated, the interlocking pipelines 24a and 24b are in the open position, and the entrainment side pilot pipelines 21a and 21b of the first main valve 11A and the second main valve 11B and the first main valve 11A and the second main valve 11B.
The unwinding side pilot circuits 22a and 22b communicate with each other. In this state, when the operating lever 12a of the first winch 51 is operated to the winding side, the pilot pressure output from the winding side pipe line 13a of the pilot valve 13A becomes the first main valve 1
It acts on the winding side operation portion 11a of 1A, and the first main valve 11
A is switched to the position on the winding side. Therefore, the main pump 1
The pressure oil discharged from 4a is supplied to the hydraulic motor device 1a. As a result, the counter balance valve 6a and the brake valve 7a are operated, the brake 8a is released, the hydraulic motor 5A is rotationally driven, and the first winch 51 is entrained.

At the same time, the pilot pressure output from the entrainment-side conduit 13a of the pilot valve 13A is the interlock valve 2
It acts on the unwinding side operation portion 11d of the second main valve 11B from the interlocking pipeline 24a through the shuttle valve 23b via 5a, and the second main valve 11B is switched to the unwinding side position. Therefore, the pressure oil discharged from the main pump 14b is supplied to the hydraulic motor device 1b. As a result, the second winch 61 is unwound and driven. The above description is for the case where the operation lever 12a of the first winch 51 is operated, but the same drive is also possible for the operation lever 12b of the second winch 61.

By operating one operating lever in this way, one winch can be driven to wind and the other winch can be driven to wind.

An embodiment of the second winch interlocking control circuit according to the present invention will be described with reference to FIGS. The first and second winch systems 52, 62 have the hydraulic motor devices 1a, 1b attached to the pedestal 30, and the hydraulic motor devices 1a, 1b are attached.
The drums 3a and 3b are attached to the output shafts 2a and 2b. By rotating the hydraulic motors 5A and 5B forward and backward, the drum 3
The wire ropes 4a and 4b are wound around and unwound on a and 3b. The hydraulic motor devices 1a and 1b include hydraulic motors 5A and 5B and counter balance valves 6a and 6
b, brake valves 7a, 7b, brakes 8a, 8b, safety valves 9a, 9b, speed reducers 10a, 10b, etc. are integrally incorporated. The hydraulic motor devices 1a and 1b are the first main valve 1
1A, connected to the second main valve 11B. 1st main valve 11
The A and second main valves 11B are switched and operated by the pilot pressure output from the pilot valves 13A and 13B operated by the operation levers 12a and 12b.
The main pump 14 supplies the pressure oil of the amount of oil corresponding to the operation amount of a and 12b.
The hydraulic motor devices 1a and 1b are supplied from a and 14b.

The pressure oil discharged from the main pumps 14a and 14b is counterbalance valves 6a and 6b and the brake valve 7.
a, 7b are operated to release the brakes 8a, 8b, and the hydraulic motors 5A, 5B are rotated.

The pilot pump 31 is connected to the pilot valves 13A and 13B, and the pilot valves 13A and 13B are connected.
Indicates that the pilot pressure according to the operation amount of the operation levers 12a and 12b to the unwinding side acts on the operation portion 11b of the first main valve 11A from the conduit 13b through the conduit 22a, and this pilot pressure is applied to the conduit 13d. From the second main valve 11B via the conduit 22b
It acts on the operation unit 11d of. 32 is a relief valve.

Next, the hydraulic motors 5A and 5B are connected to the inlet pipe line 5
The outlet pipes 5b and 5d are connected to a and 5c. The inlet pipes 5a and 5c are connected to the communication pipes 26a and 26b that short-circuit the outlet pipes 5b and 5d. Communication valves 27a and 27b are interposed in the communication pipes 26a and 26b. The communication valves 27a and 27b are adapted to open and close the communication conduits 26a and 26b in response to a command from the interlock switch 34. Further, the communication valves 27a and 27b and the throttle valve 2 that gives flow resistance to the communication pipes 26a and 26b.
8a and 28b are interposed in the communication conduits 26a and 26b. The communication valves 27a and 27b are electromagnetic two-position valves, and are connected to the interlocking switch 34 via hydraulic switches 29a and 29b. The interlocking switch 34 is the battery 3
Connected to 5.

The hydraulic switches 29a and 29b are connected to the entrainment side pilot lines 21a and 21b of the first main valve 11A and the second main valve 11B, and the first main valve 11A and the second main valve 1 are connected.
It is designed to operate by the pilot pressure on the winding side of 1B.

Next, the operation will be described. When the interlocking switch 34 is turned on to operate the first and second winches 52 and 62 in an interlocking manner, the hydraulic switch 29a,
After the operation of 29b, the communication valves 27a and 27b are energized. When the operating lever 12a of the first winch 52 is operated to the winding side in this state, the pilot pressure output from the winding side conduit 13a of the pilot valve 13A acts on the winding side operating portion 11a of the first main valve 11A, 1 main valve 1
1A is switched to the winding side. Therefore, the main pump 14a
The pressure oil discharged from is supplied to the hydraulic motor device 1a. The pressure oil discharged from the main pump 14a operates the counter balance valve 6a and the brake valve 7a to release the brake 8a and rotationally drive the hydraulic motor 5A, thereby
The winch 52 is driven to be wound.

At the same time, the pilot pressure output from the line 13a on the winding side of the pilot valve 13A actuates the hydraulic switch 29a to energize the communication valve 27b. As a result, the communication valve 27b is switched to the open position and the communication line 26
Open b. Therefore, the inlet line 5c of the hydraulic motor 5B
And the outlet pipe line 5d communicate with each other via the throttle valve 28b. As a result, the drive of the second winch 62 becomes free, but tension is applied to the wire rope 4b by the throttle valve 28b, and the second winch 62 loosens the wire rope 4b in response to the winding drive of the first winch 52. You can freely unwind it. The tension is adjusted by changing the throttle of the throttle valve 28b. The throttle valve 28b can be appropriately selected from a fixed throttle and a variable throttle. Although the above description is for the case of operating the operation lever 12a of the first winch 52, the same operation is possible for the operation lever 12b of the second winch 62.

FIG. 3 shows a combination of the first winch interlocking control circuit described with reference to FIG. 1 and the second winch interlocking control circuit described with reference to FIG. Therefore, the description thereof is omitted here.

[0037]

As described above, according to the first winch interlocking control circuit, when the interlocking switch is turned on in order to operate the first and second winches in an interlocking manner, the operating lever of the first winch is activated. By operating, the first winch is driven to be wound, while the second winch is driven to be unwound, so that the operability is improved and the collecting efficiency can be increased.

Further, according to the second winch interlocking control circuit, when the interlocking switch is turned on in order to operate the first and second winches in an interlocking manner, the operating lever of the first winch is operated. While the first winch is driven to be wound, the second winch is free to be driven. However, since the first winch is pulled by the first winch with a certain tension and unwound, the operability is improved and the collecting efficiency can be increased.

Further, when the interlocking switch is turned on to operate the first and second winches in an interlocking manner, the first
By operating the operation lever of the winch, while the first winch is driven to be wound, the second winch is driven to be unwound in synchronism with the speed of the first winch, so that operability is improved and collection efficiency can be increased. it can.

[Brief description of drawings]

FIG. 1 is a diagram showing a first winch interlocking control circuit according to the present invention.

FIG. 2 is a diagram showing the second winch-interlocking control circuit.

FIG. 3 is a diagram showing a third winch interlocking control circuit.

FIG. 4 is a diagram showing a working situation of a collecting machine.

FIG. 5 shows a multi-winch device.

FIG. 6 is a diagram showing a conventional multiple winch control circuit.

[Explanation of symbols]

1a, 1b ... Hydraulic motor device, 3a, 3b ... Drum,
5A, 5B ... Hydraulic motor, 11A ... 1st main valve, 1
1B ... 2nd main valve, 12a, 12b ... Operation lever, 1
3A, 13B ... Pilot valve, 14a, 14b ... Main pump, 23a, 23b ... Shuttle valve, 25a, 25
b ... interlocking valve, 27a, 27b ... communicating valve, 28a, 2
8b ... throttle valve, 29a, 29b ... hydraulic switch, 3
1 ... Pilot pump, 34 ... Interlock switch, 40
… Gathering machine, 50, 51, 52, 53… 1st winch,
60, 61, 62, 63 ... Second winch.

Claims (4)

[Claims] 1. A lumber collector having a winch is stopped at one of the lumbering bases, a pulley is installed at the other base, and a wire rope is wound between the pulley and the winch to cut down the lumber. In a winch interlocking control circuit for a lumber logging machine, the winch includes a first winch system and a second winch system, and the winch system includes a first winch system and a second winch system. Interlock switch (34) for transmitting interlocking command to the winch system of No. 1, and the first main valve for switching the direction of pressure oil of the first winch and the second winch
(11A) and the second main valve (11B) and the first pilot line (21a, 2) connected to the first main valve (11A) and the second main valve (11B)
2a) and the second pilot line (21b, 22b), and the signal from the interlocking switch (34), the first pilot line (2
1a, 22a) and an interlocking valve (25a, 25b) that connects the second pilot conduits (21b, 22b) to each other, and when either the first or the second winch system is driven to the winding side, the opposite A winch interlocking control circuit for a lumber logging machine, which comprises a first main valve (11A) and a second main valve (11B) that are switched so as to drive the winch system on the feed side to the unwinding side. 2. A lumber collector having a winch is stopped at one of the lumbering bases, a pulley is installed at the other base, and a wire rope is wound between the pulley and the winch to cut down lumber from the wire rope. In a winch interlocking control circuit of a timber logging machine, the winch having at least a first winch system and a second winch system,
Each winch system has a hydraulic motor (5a, 5b) attached to the mount, and a drum (3a, 5b) is attached to the output shaft of this hydraulic motor (5a, 5b).
3b) and attach the main pump (14a) to the hydraulic motors (5a, 5b).
a, 14b) to supply and discharge the discharge oil from the hydraulic motor (5a, 5b)
The main valve (11A, 11B) that winds or unwinds the wire rope around the drum (3a, 3b) by the forward and reverse rotation of
Connect the pilot lines (21a, 22a, 21b, 22) to this main valve (11A, 11B).
b) A pilot line (13A, 13B) for guiding the pressure oil from the pilot pump (31) connected by, and a communication line that short-circuits the inlet line and the outlet line of the hydraulic motor (5a, 5b). And the communication valve (27a, 27b) that opens and closes the communication pipe according to the command of the interlock switch (34) and the pilot pressure on the winding side of the main valves (11A, 11B) of the first and second winch systems. , A hydraulic switch (29a, 2) that transmits the command of the interlock switch (34) to the communication valves (27a, 27b) of the first and second winch systems.
9b) is provided with a winch interlocking control circuit for a lumber logging machine. 3. A timber harvester having a winch parked at one of the lumbering bases, a pulley is installed at the other base, and a wire rope is wound between the pulley and the winch to cut down lumber. In a winch interlocking control circuit of a timber logging machine, the winch having at least a first winch system and a second winch system,
Each winch system has a hydraulic motor (5a, 5b) attached to the mount, and a drum (3a, 5b) is attached to the output shaft of this hydraulic motor (5a, 5b).
3b) and attach the main pump (14a) to the hydraulic motors (5a, 5b).
a, 14b) to supply and discharge the discharge oil from the hydraulic motor (5a, 5b)
The main valve (11A, 11B) that winds or unwinds the wire rope around the drum (3a, 3b) by the forward and reverse rotation of
Connect the pilot lines (21a, 22a, 21b, 22) to this main valve (11A, 11B).
b) A pilot valve (13A, 13B) for guiding pressure oil from the pilot pump (31) connected by is provided, and the entrainment side pilot conduit (1A, 11B) of the first and second winch system main valves (11A, 11B) 21a, 21b) and the unwinding side pilot pipes (232a, 22b) of the main valves (11A, 11B) of the first and second winch systems are connected to each other via the shuttle valves (23a, 23b). And the interlocking valve (25a, 25b) that opens and closes the interlocking conduit according to the command of the interlocking switch (34), the communication conduit that short-circuits the inlet port and the outlet port of the hydraulic motor (5a, 5b), and the interlocking switch. A communication valve that opens and closes the communication line according to the command of (34)
(27a, 27b) and the main valve of the first and second winch systems (11
A, 11B) is operated by the pilot pressure on the entrainment side, and hydraulic switches (29a, 29b) are provided for transmitting the command of the interlocking switch (34) to the communication valves (27a, 27b) of the first and second winch systems. A winch interlocking control circuit for a lumber logging machine. 4. The winch interlocking control circuit for a lumber logging machine according to claim 2, wherein a fixed or variable throttle valve (28a, 28b) is provided in the communication conduit.