JPH0246516B2 - SHU * HOMAKIUINCHINODOCHOSOCHI - Google Patents

Description

Detailed Description of the Invention The present invention provides a main and auxiliary winch that is ideal for carrying out hoisting work by cooperating both winches in a hoisting machine such as a crane that has a main winch and an auxiliary winch. The invention relates to a tuning device.

FIG. 1 shows a side view of a crawler crane having a main winch and an auxiliary winch. 1 is the crane body, 2 and 3 are the crane body 1
The main and auxiliary winches 4 and 5 attached to the main and auxiliary winches 2 and 3 are the main and auxiliary ropes fed out from the main and auxiliary winches 2 and 3.
8 and are respectively locked to the upper end of the excavation bucket 9.

As mentioned above, the crawler crane is equipped with the main and auxiliary winches 2 and 3, and normally the hoisting work is carried out by suspending hooks, etc. from each separately. In addition, it is required that the main and auxiliary ropes 4 and 5 work together to suspend the excavation bucket 9 and perform excavation work.
In this case, as shown in FIG. 2, if an eccentricity e occurs between the center of the bucket 9 and the center of gravity of the excavated earth and sand 10, the relationship will be such that the tension F of the main rope 4<the tension F' of the auxiliary rope 5. The load on the auxiliary winch 3 becomes greater than the load on the main winch 2. Therefore, based on the principle of constant horsepower, the relationship is that the hoisting speed v' of the auxiliary hoisting rope 5<the hoisting speed v of the main hoisting rope 4, which causes the bucket 9 to tilt as shown in FIG. There was a drawback that caused serious problems in the required deep digging and continuous wall work. This work also had the disadvantage that the control levers for each winch had to be operated simultaneously with both hands, making the operation complicated.

The present invention has been made to solve the above-mentioned drawbacks, and its purpose is to solve the difference in the loads acting on the main and auxiliary ropes when hoisting the ropes in cooperation with each other. The object of the present invention is to provide a synchronization device for main and auxiliary winches that can hoist both ropes at the same speed regardless of the relationship between the two ropes.

To achieve this objective, the present invention provides a first hydraulic motor having a regulator that supplies pressure oil to the main winding hydraulic motor and controls the discharge flow rate according to the load pressure.
A variable displacement hydraulic pump and a second variable displacement hydraulic pump having a regulator that supplies pressurized oil to an auxiliary winding hydraulic motor and controls a discharge flow rate according to load pressure, and a control room for each of the regulators. In addition to connecting through a pressure valve,
The main winding operating lever and the auxiliary winding operating lever are connected so as to be interlocked, and the pressure valve is configured to be operated by an operating signal from the operating lever, so that the discharge flow rate of both hydraulic pumps is the same regardless of the load pressure. It is characterized by the fact that it is made to be.

Hereinafter, one embodiment of the present invention will be described in more detail with reference to FIG. FIG. 4 is a hydraulic control circuit diagram configured to synchronize the main and auxiliary winches 2 and 3. Reference numeral 11 denotes a first variable displacement hydraulic pump (hereinafter referred to as the first hydraulic pump) that supplies pressure oil to the main volume hydraulic motor 13, and the first hydraulic pump has a regulator 15 that controls the discharge flow rate according to the load pressure. is provided. Similarly, 12 is a second variable displacement hydraulic pump (hereinafter referred to as second hydraulic pump) that supplies pressure oil to the auxiliary volume hydraulic motor 14, and the second hydraulic pump has a discharge flow rate controlled according to the load pressure. A regulator 16 is provided. 17,
Reference numeral 18 denotes a pressure oil pipe for controlling the regulators 15 and 16, which supplies a portion of the pressure oil in the pump discharge side circuit to each regulator via throttle valves 19 and 20, thereby changing the tilt angle of the pump tilt axis, etc. It is configured to allow Reference numeral 21 denotes a connecting line connecting the pressure oil lines 17 and 18, and a pressure valve 22 is interposed in the connecting line 21, which is switched to a communicating state by pilot oil pressure. 23 and 24 are pilot hydraulic directional control valves that switch and control the flow direction of the pressure oil of the first and second hydraulic pumps 11 and 12;
They are switched by the pilot oil pressure generated in the secondary side pipes of the pilot valves 25 and 26, respectively. In addition, these pilot oil pressures are controlled by the shuttle valves 27 and 2.
8, the regulators 15, 16 and the pressure valve 22 are controlled. The operating levers 25a and 26a of the pilot valves 25 and 26 as main and auxiliary winding operating levers are connected via a connecting member 29 so as to be interlocked. 3
0 is an operating hydraulic pump that supplies pilot pressure oil.

Next, the operation of the present invention will be explained. Now, when the main winding operating lever 25a is operated in the direction of the arrow, the auxiliary winding operating lever 26a is also operated in the same direction. Therefore, the directional control valves 23 and 24 are switched to the A position, the main and auxiliary hoisting hydraulic motors 13 and 14 rotate forward in the direction of the arrow, and the main and auxiliary hoisting ropes 4 are unwound from both winches 2 and 3. , 5 excavated by bucket 9
is rolled up. At the same time, the shuttle valve 27
The pressure valve 22 is switched to the A position by the pilot pressure oil supplied via the pilot pressure oil, and the control chambers of the regulators 15 and 16 are communicated through the connecting pipe 21. Therefore, the oil pressures of the pressure oil pipes 17 and 18 are the same, and the regulators 15 and 16 operate in the same manner, so that the tilting angles of the oblique shafts of the first hydraulic pump 11 and the second hydraulic pump 12 are the same. hand,
The rotational speeds of the main and auxiliary winches 2 and 3 are the same regardless of the load pressure. As a result, even if the center of gravity of the excavation bucket 9 is shifted as shown in FIG.
The winding speeds of the main and auxiliary winding ropes 4 and 5 are the same.
Note that even if the main hoisting operation lever 25a is operated in the direction opposite to the arrow, the lowering speeds of the main and auxiliary hoisting ropes 4 and 5 will be the same.

As described above, according to the present invention, the main and auxiliary winding winches are configured in an interlocking manner, and by operating either one of the levers, the main and auxiliary winding winches can be operated simultaneously and in the same direction. Further, the flow rates of the hydraulic pumps do not differ due to differences in the loads of the main and auxiliary winches, and the rotational speeds of the main and auxiliary winches are always the same. Therefore, when the main and auxiliary hoisting winches work together to perform hoisting work, the operation becomes easy and the excavating bucket can be hoisted vertically regardless of the center of gravity.

[Brief explanation of drawings]

Fig. 1 is a side view of the crawler crane according to the present invention, Fig. 2 is a view in the direction of arrow A in Fig. 1, Fig. 3 is an action view showing the tilted state when hoisting a bucket, and Fig. 4 is a side view of the crawler crane according to the present invention. FIG. 2 is a hydraulic control circuit diagram showing one embodiment. 11...first variable displacement hydraulic pump, 12...second
Variable displacement hydraulic pump, 13... Hydraulic motor for main winding, 14... Hydraulic motor for auxiliary winding, 15, 16... Regulator, 17, 18... Pressure oil pipe line, 21... Connection pipe line, 22... Pressure valve, 23, 24... Pilot hydraulic directional switching valve, 25, 26... Pilot valve, 25a... Main winding operating lever, 26a... Auxiliary winding operating lever, 29... Connection member.

Claims (1)

[Claims] 1 Supplying pressure oil to the main winding hydraulic motor,
a first variable displacement hydraulic pump having a regulator that controls the discharge flow rate according to the load pressure; and a second variable displacement hydraulic pump having a regulator that supplies pressure oil to the auxiliary volume hydraulic motor and controls the discharge flow rate according to the load pressure.
A variable displacement hydraulic pump is provided, the control chambers of each of the regulators are connected via a pressure valve, and a main winding operating lever and an auxiliary winding operating lever are interlockably connected, and the pressure valve is connected to one of the operating levers. A synchronization device for a main winch and an auxiliary winch, characterized in that it is configured to be activated by an operation signal so that the discharge flow rates of both hydraulic pumps are the same regardless of load pressure.