JPS6348631Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hydraulically driven winch in which winch operation can be switched between two modes.

A schematic diagram of a hydraulically driven winch is shown in FIG. The winch drum D has a wire rope with a hook wrapped around it, and is connected to a hydraulic motor M via a transmission shaft (not shown) and a clutch C. The hydraulic motor M rotates forward, reverse, and stops by operating the hydraulic motor operation valve MV, and when the clutch C is in the connected state, the winch drum D rotates in the hoisting and hoisting directions and stops again. ing. This clutch C is expanded, contracted and closed by a clutch cylinder CC, and is connected and disconnected. Also, this winch drum D has a brake band B.
The brake cylinder is equipped with
When the brake spring BS is compressed by BC, the tension is released. The clutch cylinder CC and brake cylinder BC are controlled to supply and discharge pressurized oil by a winch operating valve WV and a brake operating valve BV. Winch operation valve WV
For example, is a 4-port, 3-position oil passage switching valve, in which the right position supplies the accumulated oil from pressure accumulator A to the clutch cylinder CC, the intermediate position discharges the pressure oil in the clutch cylinder CC and brake cylinder BC, and the left position The pressure oil in the clutch cylinder CC is discharged and the accumulated pressure oil is supplied to the brake cylinder BC. The brake operating valve BV is a 3-port, 2-position solenoid valve that discharges the pressure oil in the brake cylinder BC in the right position when not energized, and switches to the left position when energized through the limit switch to operate the hydraulic pump P. The discharge oil is supplied to the brake cylinder BC. The limit switch includes a limit switch S1 that is closed when the hydraulic motor operating valve MV is switched to the forward/reverse rotation position, and a limit switch S2 that is closed when the winch operating valve WV is switched to the left position. Therefore, when the hydraulic motor operation valve MV is placed in the forward rotation position or the reverse rotation position and the winch operation valve WV is placed in the right position, the winch drum D is moved up and down by power, and when the winch operation valve WV is placed in the intermediate position, the winch drum D is moved up and down. D is stopped and the winch operation valve
When WV is in the left position, winch drum D
It is in a state where it can rotate freely and can be lowered freely by its own weight such as a hook. In this way, move the winch operation valve WV to 3 positions.
By switching between the three modes, the winch drum D can be operated in three modes: power operation, stopped holding, and free descent operation.

Furthermore, there is a system in which the winch drum D is operated in two modes, power operation and free-fall operation, by using an oil passage switching valve having only the right and left positions of the winch operation valve WV described above. This example has the advantage that the brake B is not operated while the load is hoisted and then the hook is freely lowered, so that the power hoisting and free lowering operations can be repeated quickly.

In any case, in conventional hydraulically driven winches, the winch operating valve WV was only equipped with either a 3-position switching type or a 2-position switching type, so a 3-position switching type winch operating valve WV was used. In the case of a hydraulically driven winch equipped with a 2-position winch operating valve, there is a problem in that the brake B works between the power hoisting and free-fall operations, resulting in a lack of speed when repeating the two operations. For hydraulically driven winches equipped with WV, the hydraulic motor operating valve is used to stop and hold the winch.
The inconvenience of having to use the operation to return the MV to neutrality could not be resolved.

In view of the above-mentioned circumstances, the present invention is designed to allow a single hydraulically driven winch to have both the advantages of having a 3-position winch operating valve WV and the advantages of having a 2-position winch operating valve WV. The present invention provides a hydraulically driven winch constructed according to the present invention.

The configuration of the present invention will be explained based on the embodiment shown in the drawings. FIG. 2 shows the hydraulic circuit of the hydraulically driven winch according to the embodiment of the present invention, and as shown in the figure, the winch operating valve WV can be operated in three positions among the right position, intermediate position, and left position, and the winch operation valve WV can be operated in three positions among right position, intermediate position, and left position. It is designed to allow two-position switching operation between the left position. The rest of the structure is the same as that of the conventional example shown in FIG.

Details of the winch operating valve WV will be explained next. FIG. 3 shows a sectional view of the winch operating valve WV. 1, 2, 3, and 4 are built-in check valves, which are housed opposite valve seats 6, 7, 8, and 9 bored in the valve body 5. Each check valve 1, 2, 3, 4 and each port C, B, A, T provided on the valve body 5 are connected by an internal passage as shown in the circuit symbol shown in FIG. 10 is a spool, on one side of which is formed a cam profile is formed with a cam profile Y for pushing and opening each check valve into two positions: right position and left position. When the spool 10 is rotated 180 degrees around the axis, the X plane or the Y plane faces the check valve side. 1
1, 12, 13, 14 are balls interposed between the spool 10 and the check valves 1, 2, 3, 4; 15, 16 are interposed between the check valves 2, 3 and the balls 12, 13. This is a spacer. When the spool 10 is slid in the axial direction, the upward slope of the cam profile (X, Y) lifts and pushes open the check valves 1, 2, 3, 4, and on the downward slope, the valve seats 6, 7 are lowered by spring action. , 8 and 9 and act to close them.

Next, the opening/closing operation of the winch operating valve WV will be explained based on FIGS. 5 and 6. Fig. 5 is a valve opening diagram when the valve is operated with cam profile Shows area. When the spool 10 is pushed to the left in FIG.
is raised and connected to the AC port. When the spool 10 is pulled back slightly to the right, the check valve 4 first moves up, and then the check valve 2 moves down. At the intermediate position, check valve 4 and check valve 1 rise to connect the BT port and
Connected to CT port. When the spool 10 is pulled to the right in FIG. 3, it is in the left position, and in this position, the check valve 3 and the check valve 1 are raised, and the AB port and CT port are in communication. Note that the triangular depression at the top of the valve opening diagram means the detent location. FIG. 6 is a valve opening diagram when the valve is opened with cam profile Y, and the spool 10
When pushed in to the right position, check valve 2 rises and connects to the AC port, and spool 1
When the valve 0 is pulled back to the left position, the check valves 1 and 3 are raised and the CT port and the AB port are in communication. Note that the check valve 1 begins to rise from the middle of the spool 10, and communication with the CT port is performed before the AB port. Switching of the cam profile X plane and Y plane of the spool 10 described above can be performed by inserting a handle into the corner part 10a at the end of the spool 10 and rotating it, and pushing and pulling back the spool 10 can be performed by using the other end part 10b.
This can be done by levers connected to or by cables. Note that the levers or cables are preferably connected using a rotation joint or the like that absorbs the rotation of the spool 10.

Since the hydraulically driven winch of the present invention is equipped with the winch operation valve WV described in detail above, by simply rotating the spool 10, winch operation can be performed using the 3-position switching type winch operation valve WV. Winch operation can also be performed using a switching type winch operation valve. Therefore, it is possible to select the cam profile X or Y as appropriate depending on the type of winch work to enable smoother and faster winch work.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of a conventional hydraulically driven winch.
Fig. 2 is a configuration diagram of a hydraulically driven winch according to the present invention, and Fig. 3 is a winch operation valve WV of an embodiment of the present invention.
4 is a circuit symbol diagram of the winch operating valve WV shown in FIG. 3, FIG. 5 is a valve opening diagram when the winch operating valve WV is operated on the cam profile The figure is a valve opening diagram when the winch operation valve WV is operated on the Y surface of the cam profile. 1, 2, 3, 4: Check valve, 10: Spool,
X, Y: Cam profile, WV: Winch operation valve, CC: Clutch cylinder, BC: Brake cylinder.

Claims (1)

[Scope of utility model registration request] A winch drum driven by a hydraulic motor connected via a clutch, a clutch cylinder that connects and disconnects the clutch, a brake that biases the winch drum in the braking direction with a spring, and releases the brake against the biasing force of the spring. In a hydraulically driven winch equipped with a brake cylinder that acts in a direction, a clutch cylinder, and a winch operation valve that controls pressure oil supply and discharge between the brake cylinder, the winch operation valve is a check valve, and a cam that pushes open the check valve is provided. A cam profile is formed on one side of the spool to switch the pressure oil supply and discharge to the clutch cylinder and the brake cylinder in three modes, and a cam profile is formed on the other side of the spool to switch the pressure oil supply and discharge to the clutch cylinder and the brake cylinder. A hydraulic winch characterized in that a cam profile that can be switched between two types is formed, and a winch operating valve is operated by appropriately selecting one of the two cam profiles.