JPH026061Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Industrial Application Field) The present invention relates to a swing operation device for a large hydraulic crane. (Prior Art) A large hydraulic crane equipped with a slewing device cannot be transported by road in an assembled state, so the base machine is divided into three main parts: a lower frame equipped with a traveling device as shown in Figure 3; The base machine is divided into three parts: A, an upper frame B that is equipped with an engine and various working devices such as a swing and a winch, and a driver's cab C that is equipped with operating devices such as remote control valves for each of the above devices. Then, these parts are disassembled and transported to the work site, where they are assembled and the specified work is carried out, and after the work is completed, they are disassembled into the three parts mentioned above again and transported to the next work site or to the specified storage. We are trying to transport it to other locations. In such a large hydraulic crane, the conventional swing operation device includes a main pump 1, a swing control valve 2, a swing motor 3, a negative brake 4, and a negative brake control solenoid valve on an upper frame B as shown in FIG. 5, pilot pumps 6 and 7, a tank 8, and an engine (not shown), and a remote control valve 9 for turning is provided in the driver's cab C. Then, the driver's cab C is placed in the upper frame B.
and the primary side pipe 9a of the remote control valve 9.
The tank pipe line 9b is connected to the pipe line 7a leading to the pilot pump 7 and the pipe line 8a leading to the tank 8 at parts a and b, and the secondary side pipes 9c and 9d of the remote control valve 9 are connected to the part c, By connecting the pilot pipes 13a and 13d of the swing control valve 2 at the part d, the swing control valve 2 can be operated by the remote control valve 9.
switching control, that is, drive control of the swing motor 3. However, in the above conventional device, the upper frame B
Although a swing device consisting of a swing motor 3, a swing control valve 2, etc. is provided in the vehicle, a remote control valve 9 for operating the swing control valve 2 is provided only in the driver's cab C. The upper frame B cannot be rotated until after the driver's cab C is connected to the upper frame B as described above and the respective pipes are connected at the sections a to d. For example, when assembling and disassembling upper frame B to lower frame A,
Due to the work procedure, there are cases where the operator's cab C is not connected to the upper frame B. In such cases, the conventional device described above cannot freely rotate the upper frame B, making it difficult to assemble and disassemble it. Bad sex. In addition, since the upper frame B must be hoisted by a separate crane and assembled while adjusting the swivel bearing and the orientation of the upper frame B, fine adjustments are difficult and dangerous. It was hot. (Purpose of the invention) In view of these points, the present invention is designed to enable the upper frame equipped with a swivel device to be swiveled at will by an independent auxiliary operation, in addition to the operation by a remote control valve in the driver's cab. The present invention provides a swing operation device that can improve the workability and safety of assembling and disassembling a large hydraulic crane, especially when transporting a large hydraulic crane. (Structure of the invention) The device of the invention is constructed by removably assembling a lower frame equipped with a traveling device, an upper frame equipped with a turning device and a working device, and a driver's cab equipped with operating devices for each of the above devices. A large hydraulic crane is equipped with a remote control valve for main swing operation that outputs pilot pressure in response to lever operation in the operator's cab, and a remote control valve for main swing operation that outputs pilot pressure according to lever operation, and a main pump that supplies pressure oil from the main pump to the swing motor and tank of the swing device. A swing control valve for controlling the supply and discharge of the main operation valve, a pilot pump, and an auxiliary operation solenoid valve that can be remotely operated separately from the main operation remote control valve are provided. and tank lines to the pilot pump and tank, and the secondary side line to the pilot line for switching the swing control valve, respectively, and the primary side line and tank line of the auxiliary operation solenoid valve. The pilot pump and the tank are characterized in that the secondary side pipes are respectively connected to the pilot pipes for switching the swing control valve. With this configuration, even if the operator's cab is not connected to the upper frame, the swing control valve can be easily switched and controlled by operating the auxiliary operation solenoid valve provided on the upper frame. The workability and safety of assembling and disassembling the driver's cab can be improved. Additionally, when the driver's cab is connected to the upper frame, the swing control valve can be switched and controlled at will using a remote control valve inside the driver's cab, and delicate control of the swing is possible, improving the controllability of the swing. . (Example) Fig. 1 shows an embodiment of the present invention. In the figure, parts that are the same as those of the conventional device (see Fig. 4) are given the same reference numerals, and will be explained below as necessary. . The upper frame B has a main pump 1, a swing control valve 2, a swing motor 3, a negative brake 4, a solenoid valve for negative brake control 5, a pilot pump 6 and 7, a tank 8, and an engine (not shown), as in the conventional case. In addition to providing the first,
An auxiliary operating circuit with second solenoid valves 10, 11 is provided. On the other hand, in the operator's cab C, there is a remote control valve 9 for the main operation of turning, which is equipped with a pair of variable pressure reducing valves that output pilot pressure according to the operation of the lever 9e, and a remote control valve 9 for the main operation of turning. A switch is provided for the solenoid. The swing control valve 2 includes four check valves 2a to 2.
Each check valve 2 is
Switching pilot conduit 13a on the back side of a to 2d
~13d are connected. The solenoid valve 5 can be switched to the 2nd position by a solenoid 5a, the solenoid valve 10 can be switched to the 2nd position by the solenoid 10a, and the solenoid valve 11 can be switched to the 3rd position by the solenoids 11a and 11b, and the secondary side of the solenoid valve 5 can be switched to a negative brake. 4, and the primary side and tank side of this solenoid valve 5, and the solenoid valve 1
The primary side pipe line 14a and tank line 14b of 1 are connected in parallel to a pipe line 6a leading to the pilot pump 6 and a pipe line 8a leading to the tank 8, respectively. Further, the pilot conduits 13c and 13d are switchably connected to the pilot conduits 13a and 13b by the solenoid valve 10, and the secondary conduits 14c and 14d of the solenoid valve 11 are connected to the upstream side of the solenoid valve 10. are connected. Each solenoid 5 of each electromagnetic valve 5, 10, 11
a, 10a, 11a, 11b are operation switch connectors 12 provided on the side surface of the upper frame B, etc.
electrically connected to. In the above configuration, the upper frame B and the driver's cab C are configured independently from each other, and the upper frame B
A hydraulic circuit (swing drive circuit) provided in the driver's cab C (swing drive circuit) and a hydraulic circuit (main operation circuit) provided in the driver's cab C are removably connected. That is, the primary side pipe line 9a and the tank pipe line 9b of the remote control valve 9 are connected to parts a and b.
a pipe line 7a leading to the pilot pump 7;
It is detachably connected to a conduit 8a leading to the tank 8, and secondary conduits 9c, 9d of the remote control valve 9 are detachably connected to pilot conduits 13a, 13b at portions c and d. In addition, to the connector 12,
An operation switch provided in the driver's cab C and a remote control device configured separately from the driver's cab C are selectively connected. Next, the operation will be explained. When there is a driver's cab When performing swing work with the driver's cab C connected to the upper frame B and the hydraulic circuits connected to each other at sections a to d, the driver's cab C is connected to the upper frame B.
The rotation is controlled by operating a remote control valve 9 for main operation provided in the main control valve 9. In this case, solenoid 1
0a, 11a, 11b are not operated, and the solenoid valves 10, 11 remain in the illustrated positions. Then, by operating a switch provided in the driver's cab C, the solenoid 5a is energized, the solenoid valve 5 is switched to the right position in the drawing, pressure oil from the pilot pump 6 is guided to the negative brake 4, and the negative brake 4 is turned off. After that, pilot pump 7
When the lever 9e is tilted to the left while the pressure oil is guided to the primary side of the remote control valve 9, the pilot pipes 13b and 13c connected to the secondary side are opened.
A secondary pressure is introduced to, and this secondary pressure closes the second and third check valves 2b and 2c, and also connects to the back of the first and fourth check valves 2a and 2d. The pilot pipes 13a, 13d are connected to the tank 8 via a remote control valve 9, and the check valves 2a, 2d are free only by being biased by a spring. As a result, the oil discharged from the main pump 1 is
While opening the check valve 2a, the oil is supplied to the swing motor 3 via the left pipe 3a, and the return oil from the swing motor 3 is returned to the tank 8 via the fourth check valve 2d, and the swing motor 3 rotates in the normal direction. The upper frame B is driven and rotated to the left. At this time, the remote control valve 9
The secondary pressure led to the pilot pipes 9d, 13b, 13c is controlled, and the closing force of the second and third check valves 2b, 2c is controlled. As a result, the supply pressure to the swing motor 3 is controlled, the rotational driving force of the swing motor 3 is controlled, and torque control is performed. In addition, when rotating the upper frame B to the right, the lever 9e of the remote control valve 9 may be tilted to the right. When stopping the turning, return the lever 9e to neutral and then operate the reverse lever to stop the turning motor 3 during the turning.
The secondary pressure is introduced to the back surface of the check valve 2d or 2c corresponding to the discharge side of the rotary motor 3, and a hydraulic brake is applied to the swing motor 3 to decelerate and stop the motor 3. After that, the lever 9e is returned to neutral, the solenoid 5a is demagnetized, and the solenoid valve 5 is returned to the position shown, thereby turning on the negative brake.
and its stopped state is maintained. When there is no operator's cab C When assembling or disassembling the machine without the operator's cab C, for example, when assembling or disassembling the upper frame B to the lower frame A (see Figure 3), attach the upper frame B to the upper frame B. A remote control device (not shown) is electrically connected to the provided connector 12 via a lead wire or the like, and the solenoid valves 10 and 11 of the auxiliary control circuit and the negative brake are controlled by the control switch provided on the remote control device. Each solenoid 10a, 11a, 11 of the control solenoid valve 5
Control ON/OFF of b and 5a by remote control. At this time, portions corresponding to portions a to d of each piping of the hydraulic circuit provided in the upper frame B are blocked by appropriate means such as plugs. In addition, if we show an example of controlling each solenoid valve using a remote control device,
It is as shown in Table 1.

[Table] Next, an example of control for turning and stopping will be explained based on Table 1. When there is no operator's cab or remote control device According to Table 1, the solenoids of each solenoid valve 5, 10, and 11 are all turned off, so all solenoid valves are held at the positions shown, and the negative brake 4 is turned on. , the swing motor 3 is stopped. On the other hand, the pilot pipes 13a to 13d for the swing control valve 2 are blocked at portions c and d and at the neutral position of the solenoid valve 11.
No pilot pressure is introduced to check valves 2a to 13d, and each of the check valves 2a to 2d is only biased by a spring. Therefore, in this state, main pump 1
Even if the valves 2a to 2 are driven, the discharged oil is
d and is returned to the tank 8 as it is, and the swing motor 3 is not driven and remains stopped by the negative brake 4. The following control is performed by operating a switch on a remote control device connected to the connector 12. Turn left Turn the solenoid valve 5 to the right position in the drawing and turn off the negative brake 4 by operating the switch in Table 1.
After that, the solenoid valve 11 is switched to the right position in the figure while the solenoid valve 10 is held at the position shown. As a result, the pressure oil from the pilot pump 6 is guided to the pipes 6a, 14b, 13b, 13c, the second and third check valves 2c, 2d are closed, and the pilot pipes 13a, 13d are connected to the tank. 8, and the first and fourth check valves 2a, 2d
becomes free. Then, in the same way as when turning to the left using the remote control valve 9, the oil discharged from the main pump 1 is supplied to the swing motor 3 from the conduit 3a side, and the motor 3 is driven to rotate in the normal direction, thereby performing a turn to the left. Turn to the right Turn the solenoid valve 5 to the right position in the drawing and turn off the negative brake 4 by operating the switch in Table 1.
After that, the solenoid valve 11 is switched to the left position in the figure while the solenoid valve 10 is held at the illustrated position. As a result, the pressure oil from the pilot pump 6 is guided to the pipes 6a, 14a, 13a, 13d, the first and fourth check valves 2a, 2d are closed, and the pilot pipes 13b, 13c are connected to the tank. 8, and the second and third check valves 2b, 2c
becomes free. Then, the oil discharged from the main pump 1 is supplied to the swing motor 3 from the conduit 3b side, contrary to the case of the left turn, the motor 3 is driven in the reverse direction, and the right turn is performed. In addition, when turning left and turning right above,
pilot lines 13b, 13c and 13a,
13d, pressure oil may be supplied from the pilot pump (for high pressure) 7 for the primary pressure of the remote control valve 9, but when turning without this operator's cab C, the turning torque may be small. In the illustrated example, pressure oil is led from a pilot pump (for low pressure) 6 for negative brakes, thereby reducing the size of the piping and electromagnetic valve 11 of the auxiliary operation circuit and reducing costs. Before stopping the swing, operate the switch in Table 1 to hold the solenoid valve 5 in the position shown and turn off the negative brake 4.
Then, the solenoid valve 10 is switched to the right position in the drawing while the solenoid valve 11 is held at the selected position during the turning. This allows the check valve 2d or 2c corresponding to the discharge side of the swing motor 3 to operate, similarly to when the remote control valve 9 operates the reverse lever during swing.
Pressure oil from the pilot pump 6 is guided to the back of the swivel motor 3, and a hydraulic brake is applied to the swing motor 3.
The motor 3 is decelerated and stopped. After the rotation has stopped, by operating the switch in Table 1, the solenoid valve 10
While switching to the right position in the figure, that is, with the hydraulic brake still operating, the solenoid valve 11 is returned to the illustrated position, and the solenoid valve 5 is returned to the illustrated position. As a result, the negative brake 4 is turned on, and the swing motor 3 is kept in a stopped state. As mentioned above, even if there is no operator's cab C, by connecting a remote control device to the connector 12 of the upper frame B and controlling each solenoid valve,
The upper frame B can be easily controlled to rotate. Also,
The remote control device controls each solenoid of the solenoid valves 5, 10, and 11 on and off, and only requires an electrical switch, so it can be made smaller and lighter, and can be carried freely as a handy type, and can be connected easily. Rotation can be controlled while checking the working position. FIG. 2 shows another embodiment, in which a spool type flow control valve is used as the swing control valve 2'. Therefore, the swing control valve 2'
Only two pilot pipes 13a' and 13b' are required for the remote control valve 9, and the primary pressure for the remote control valve 9 may be low pressure. There is. Note that the other circuit configurations and control methods are substantially the same as in the embodiment shown in FIG.
The swing control valve 2' is controlled by the remote control valve 9 to control the swing, and if there is no operator's cab C, the connector 1
2 to connect a remote control device to each solenoid valve 5, 10,
11, the swing control valve 2'
Turning can be controlled by switching the (Effects of the invention) As explained above, the invention enables the rotation device provided on the upper frame to be connected to the remote control valve for main operation provided in the driver's cab and the solenoid valve for auxiliary operation provided on the upper frame. Therefore, it can be operated selectively, and therefore, even when there is no operator's cab, it can be easily turned by operating the auxiliary operation solenoid valve, especially when assembling or disassembling a large hydraulic crane. It can be controlled, and during the control, the rotation can be controlled at will while observing the working position, and the workability and safety during the assembly and disassembly can be greatly improved. In addition, the solenoid valve for auxiliary operation is used for auxiliary turning work during assembly, disassembly, etc., so the solenoid valve is smaller and lower pressure than the remote control valve for main operation. Therefore, it can be constructed relatively inexpensively. In addition, during normal turning work, delicate turning control can be performed by operating a remote control valve provided in the operator's cab, and controllability can be improved.

[Brief explanation of the drawing]

Fig. 1 is a hydraulic electrical circuit diagram showing an embodiment of the device of the present invention when a pressure control valve is used as the swing control valve, and Fig. 2 is an implementation of the device of the invention when a flow control valve is used as the swing control valve. FIG. 3 is a side view showing an example of a hydraulic crane to which the device of the present invention is applied, and FIG. 4 is a hydraulic circuit diagram showing a conventional example. 1... Main pump, 2, 2'... Swing control valve,
3... Swing motor, 4... Negative brake, 5...
Solenoid valve for negative brake control, 6, 7... Pilot pump, 8... Tank, 9... Remote control valve for main operation, 10, 11... Solenoid valve for auxiliary operation, 12...
...Connector for connecting remote control device, 13a, 13
b, 13c, 13d, 13a', 13b'...Pilot conduit.

Claims (1)

[Scope of utility model registration request] A large hydraulic crane is constructed by removably assembling a lower frame equipped with a traveling device, an upper frame equipped with a swivel device and a working device, and a driver's cab equipped with operating devices for each of the above devices. A remote control valve for main operation of the swing is provided to output pilot pressure in response to lever operation, and a swing control valve is provided on the upper frame to control the supply and discharge of pressure oil from the main pump to the swing motor and tank of the swing device. A pilot pump and an auxiliary operation solenoid valve that can be remotely operated separately from the main operation remote control valve are provided, and the primary side pipe line and tank line of the main operation remote control valve are connected to the pilot pump and the tank. The secondary side pipes are removably connected to the switching pilot pipes of the swing control valve, and
Swinging of a large hydraulic crane characterized in that the primary side pipe and tank pipe of the auxiliary operation solenoid valve are connected to a pilot pump and a tank, and the secondary side pipe is connected to a pilot pipe for switching the swing control valve. Operating device.