JPH0328064A - Braking system of mobile crane - Google Patents

Abstract

PURPOSE:To save energy, enhance the safety, and stop in place easily by furnishing an electromagnetic pressure boosting which generates oil pressure in the condition out of energization and operates a friction braking part, and furnishing a remote control means to make on.off control of the solenoid of this pressure boosting means. CONSTITUTION:An electromagnetic pressure boosting means 11 to generate oil pressure in the condition out of energization and to operate a friction braking part 10 is installed on an oil path 9 tying it to a reserve tank 8, and a remote control means 18 is furnished to make on.off control of the solenoid of this pressure boosting means 11. This enables control of a mobile crane remotely, and the driver can work as an acid person for floor works, to contribute to accomplishment of saving the energy. Further there is brake oil as the braking force transmitting medium, so that abrupt stopping is avoided, and the safety enhanced through restricting of the swing amplitude of the object to be lifted in the stop position. Further the stopping can be made in place easily and in good performance.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a braking system for a self-propelled crane, such as an overhead crane.

(Prior art) Utilizing the space under the ceiling of the factory building l shown in FIG.
An overhead crane 5 is installed on one side of the girder 3. The braking operation to properly stop the girder 3 and the hoisting device 4 at a predetermined position is performed by pressing a foot pedal (not shown in FIG. 1) provided on the driver's seat 6. Ru.

(Problem to be solved by the invention) In this way, by only the braking operation in the driver's seat 6,
In a system in which the overhead crane 5 is stopped, for example, when performing various operations such as attaching and detaching wires and hooks to objects to be hoisted on the floor of a factory, positioning and posture control, etc. Even if there is a request to hire one more worker in addition to the full-time worker, the driver cannot participate in the front-end work as an auxiliary worker. Therefore, if workers are not replaced from elsewhere, there will be a huge loss. This kind of waste can be solved by systemizing the braking to be controlled remotely, since the reciprocating movement of the digits 3 and the movement of the hoisting device 4 could originally be done by remote control from the floor. It can be omitted. Electromagnetic brakes are generally known as braking devices that are operated by remote control, and although it is possible to use this type of electromagnetic brake, it is difficult to adjust the braking force with electromagnetic brakes, and Due to the sudden action and sudden stop, the hoisted object swings with a large amplitude at the digit 3 stop position, creating a problem that creates a sense of danger. The present invention was developed in view of these circumstances, and even if the operator is involved in floor work as an auxiliary worker,
Braking can be done by remote control from the floor, which saves labor. It also avoids sudden stops and limits the swinging amplitude of the hoisted object to a small level at the stop position, increasing safety. - The purpose of the present invention is to provide a braking system for a self-propelled crane that can be easily stopped in a suitable manner.

(Means for Solving the Problems) The braking system for a self-propelled crane according to the present invention has a self-propelled crane system that is equipped with a self-propelled crane. An electromagnetic boosting means that generates hydraulic pressure in a non-excited state to operate the friction braking section is interposed in the oil passage connecting the friction braking section that brakes the II axis and the reserve tank, and the electromagnetic coil of the electromagnetic boosting means is turned on. - Equipped with remote control means for OFF control.

(Function) In the present invention, when the electromagnetic coil is brought into a non-excited (demagnetized) state by turning off the remote control means, hydraulic pressure is generated in the oil passage by the electromagnetic pressure boosting means and the IIJ friction braking section is actuated. Further, when the electromagnetic coil is excited by turning on the remote control means, the oil pressure in the oil passage disappears, and the friction braking section returns to its normal state.

(Embodiment) Fig. 2 is a system diagram showing an embodiment of the braking system for a self-propelled crane according to the present invention, in which 7 is a manual pressure boosting means, a is a reserve tank, 9 is an oil passage, and l
0 indicates a friction braking unit, and 11 indicates an electromagnetic boosting means.

The manual pressure increase means 7 is an oil passage 9 that connects a reserve tank 8 storing brake oil and a friction braking unit IO.
It has a foot pedal 7A and a master cylinder 7B, and the depression force of the foot pedal 7A generates hydraulic pressure in the brake oil in the oil passage 9 to operate the friction braking part 10, and the friction braking part 10 is This is a well-known device that applies braking force, and is installed in the driver's seat 6 (see Figure 1).

The friction braking unit IO operates, for example, as a running drive aIduz(
This is a well-known disc brake that applies pressure to an integrally fixed disc l3 from both sides with friction butts (not shown). The electromagnetic pressure boosting means 1l is interposed between the manual pressure boosting stage 7 and the friction braking unit 10 in the oil passage 9. That is, the electromagnetic boosting means 11 is arranged near the manual boosting means 7 in the driver's seat 6. As shown in FIG. 3, it is comprised of a mask cylinder l4 having a brake oil intake 14a and an outlet i4b, and an electromagnetic drive part l5 integrally connected to this mask cylinder 14 via a base plate l6.

'win drive unit l5 has a case 15B whose opening at one end is closed with a cover 158, and an electromagnetic coil 15 is attached to the outer periphery of a coil spool 15G housed in this case 15B.
0 is wrapped. Then, there is an annular armature 15E fixed to the inner surface of the other end of the case 15B and fitted to the inner end of the coil spool 15G, and a ring-shaped armature 15E that is slidably inserted into the coil spool 15G opposite to the annular armature 15E. A stopper 15G is fixed to the outer surface of the other end of the case 15B. The stopper 15G holds the other end of a rod member l51 inserted into the annular armature 15E and the cylindrical flexible core 15F, and the other end of the rod member l51 is formed at one end of the cylinder. A compression coil spring 15K is interposed between a regulating collar 15h that restricts the forward movement of the movable core 15F and a spring seat 15J on the inner surface of the connecting member 151 fixed to one end of the movable core 15F. Further, a piston 48 that moves back and forth within the mask cylinder l4 is connected to one end of the connecting member 151. However, the connecting member 151 and the piston l48 may be integrally molded. In FIG. 3, an electromagnetic coil 150 is excited by a signal output from a remote control means, which will be described later, so that the cylindrical movable iron core 15F moves against the spring force of the compression coil spring 15K to form an annular armature. 15
In the state where it is adsorbed to H, that is, the histone l48 opens the population 14a of the master cylinder l4, and the electromagnetic booster 1,000 stages 1
1 indicates a state in which no hydraulic pressure is generated in the oil passage 9. The stroke amount of the cylindrical movable iron core 15F and the spring constant of the compression coil spring 15K can be adjusted by moving the adjustment bolt l-17, which is screwed through the stopper 15G, back and forth to move the rod member 15+1.
This is done by advancing and retreating. 45 in FIG. 2, l8 indicates remote control means, and electric power 6J
1 consists of a button switch or a wireless signal transmitter that outputs a control signal for ON/OFF control of the electromagnetic coil 150 of the boosting means 11.

Next, the operation of the above configuration will be explained. From the driver's seat 6 in Figure 1, move the digit 3 of the overhead crane 5 to the track 2.
When moving in the direction of the plane of the paper or the direction opposite to the plane of the paper along the
After FF, depress the foot pedal 78 of the manual boosting means 7 shown in FIG. The TL magnetic boosting means 11 is the third
Since it is maintained in the excited state shown in the figure, by stepping on the foot pedal 78, the manual pressure boosting means 7 that goes into the oil passage 9 and the brake oil in the friction braking unit 10 are
A pressure corresponding to the strength with which the foot pedal 78 is depressed is generated, and the friction pads of the friction braking unit 10 clamp and brake the disc 13 from both sides, stopping the rotation of the travel drive shaft l2. Girder 3 can be stopped at a predetermined position. On the other hand, when the driver leaves the driver's seat 6 and moves the digit 3 along the trajectory iJi2 in the direction of the page or in the direction away from the page, for example by remote control from the floor, 4j
, Remote control from the floor (2. Turn off the power to the C drive source)
F After that, from the remote control means l8 to the electromagnetic boosting means l1
The signal input to the electromagnetic coil 150 is turned off to demagnetize the electromagnetic coil 150. As a result, the cylindrical movable iron core 15 formed by the pier-like armature lsIi in FIG.
The adsorption action of F is released, and the movable core 15F moves forward in the left direction in the drawing by the spring force of the compression coil spring 15K.
The front end of the stroke shown in FIG. 4 is reached. That is, the piston 14^ in the mask cylinder 14 closes the IJ14a, and the electric fin that flows into the oil passage 9! The brake oil in the I-pressure stage 1l and the friction braking unit 10, more specifically,
In the brake oil existing between the tip surface of the piston 14^ and the friction braking part lO, there is a droplet of a size approximately determined by the spring constant of the compression coil spring 15κ and the stroke amount of the cylindrical movable iron core 15F. By generating pressure, the friction pads of the friction braking unit lO clamp and brake the disc 13 from both sides thereof, stopping the rotation of the drive shaft l2 and stopping the girder 3 at a predetermined position.

This braking state is controlled by the remote control means 18 from the electromagnetic boosting means 1.
1? By manually applying a power to the E611 coil 150 to excite the electromagnetic coil 150, the above-mentioned reverse operation is obtained and released. Naturally, the braking state obtained by depressing the foot pedal 7^ of the manual boosting means 7 described above is achieved by releasing the foot pedal 78 and causing the foot pedal 7A to return to its original state by the spring force of a spring (not shown). It will be canceled.

In the above embodiment, the overhead crane 5 is driven to move the girder 3 in the direction of the page or in the direction away from the page! lIIb
12 has been described, the present invention is not limited to the above-mentioned embodiment. Needless to say, it can be applied to Moreover, it is naturally applicable not only to the overhead crane 5 but also to other self-propelled cranes.

Further, in the embodiment described above, the electric TN booster 11 is interposed between the manual booster 7 in the oil passage 9 and the friction braking unit 10, but the electromagnetic booster 1l is installed in the oil passage 9. Even if it is interposed between the reserve tank 8 and the manual boosting stage 7, the same operation as in the embodiment described above can be obtained.

(Effects of the Invention) According to the present invention, in the oil passage connecting the friction braking part and the reserve tank,
The system is equipped with a 71Ifin pressure boosting means that generates pressure in a non-excited state to operate the friction braking section, and is equipped with a remote control means that turns on and off the electromagnetic coil of this electromagnetic boosting means. Since the self-propelled crane can be braked by operation, it is possible to have the driver participate as an auxiliary worker for work on the floor, and it is possible to save labor by eliminating the need to replenish workers from elsewhere. can be realized.

Furthermore, since brake oil is present as a transmission medium for braking force, it is possible to avoid a sudden stop unlike the well-known braking system using an electromagnetic brake, and the swinging amplitude of the hoisted object at the stopping position can be limited to a small value for safety. It has advantages such as being able to improve the performance and being easy to stop at a predetermined position.

[Brief explanation of drawings]

Fig. 1 is a schematic front view showing an example of a self-propelled crane to which the present invention is applied, Fig. 2 is a system diagram showing an embodiment of the invention, and Fig. 3 is excitation in an embodiment of the electromagnetic boosting means. FIG. 4 is a cross-sectional view of the non-excited (de-energized) state. 5... Self-propelled crane (overhead crane) 7... Manual boosting means 78... Foot bed nozzle 8... Reserve tank 9... Oil passage 1G... Friction braking part 1l... Electric ill Boosting means 12...travel drive shaft +50...electromagnetic coil 18...remote control means

Claims (1)

[Claims] (1) It has a friction braking part that brakes the travel drive shaft of the self-propelled crane, and an oil passage connecting this braking part and a reserve tank, and is inserted in the oil passage and is inserted into the oil passage by the pressing force of the foot pedal. In a braking system for a self-propelled crane equipped with a manual pressure increasing means that generates hydraulic pressure in brake oil to operate the braking section, an electromagnetic crane that generates hydraulic pressure in the oil passage in a non-excited state and operates the friction braking section. A braking system for a self-propelled crane, characterized in that a pressure boosting means is provided and a remote control means for controlling ON/OFF of an electromagnetic coil of the electromagnetic boosting means.