JPH0328063A - 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 means which generates oil pressure in the energized condition 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 energized condition for operating a friction braking part 10 is installed on an oil path 9 tying it to a reverse 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 aid 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 can be avoided, and the safety be 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 Industrial Application) 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. 1, a track 2.
An overhead crane 5 is provided on one side of the girder 3, and is provided with a hoisting device 4 that moves the girder 3 back and forth in the direction of the page or in the direction opposite to the page, and reciprocates in the left-right direction along the girder 3. The system is operated from the driver's seat 6 and stops the girder 3 and the hoisting device 4 appropriately at a predetermined position! IIJI!
! The operation is performed by depressing a foot pedal (not shown in FIG. 1) provided on the driver's seat 6. (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 above-mentioned work as an auxiliary worker. Therefore, there is a waste of having to recruit workers from elsewhere. Originally, the reciprocating movement of the girder 3 and the reciprocating movement of the hoisting device 4 were possible by remote control from the floor, so it is possible to eliminate such waste by systemizing the braking to be controlled remotely. Can be done. An electromagnetic brake is generally known as a braking device operated by remote control, and it is conceivable to use this type of electromagnetic brake, but 1! With magnetic brakes, it is difficult to adjust the braking force, and moreover, it acts suddenly and stops suddenly, so the hoisted object is
Because it oscillates with a large amplitude at the digit 3 stop position,
There are problems that make it feel dangerous. The present invention was developed in view of these circumstances, and even if the driver is involved in floor work as an auxiliary worker,
Braking can be performed by remote control from the floor, which saves labor, avoids sudden stops, and limits the swinging amplitude of the hoisted object at the stop position to a small level, increasing safety. The purpose of this invention is to provide a braking system for self-propelled cranes that makes it easy to stop them in a suitable position. (Means for Solving the Problems) A braking system for a self-propelled crane according to the present invention generates hydraulic pressure in an excited state in an oil passage connecting a friction braking unit that brakes a traveling drive shaft and a reserve tank. Ma N! An electromagnetic boosting means for operating the braking section is provided, and a remote control means is provided for controlling the ON/OFF state of the electromagnetic coil of the electromagnetic boosting means. (Function) In the present invention, when the electromagnetic coil is excited by the ON ii operation of the remote control means, hydraulic pressure is generated in the oil passage by the electromagnetic pressure boosting means to operate the friction braking section. Further, when the electromagnetic coil is placed in the non-excited 6i1 (deactivated 1ii1) state by turning off the remote control means, the hydraulic pressure in the oil passage disappears and the friction braking section is returned 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, 8 is a reserve tank, and 9 is an oil passage %1.
0 indicates a friction brake, and l1 indicates an electromagnetic boosting means.

The manual pressure boosting means 7 is an oil passage 3 that connects a reserve tank 8 storing brake oil and a friction braking unit IO.
The foot pedal 7^ and the master cylinder 711 are interposed in the
The oil passage 9 is opened by pressing the foot pedal 7^.
The brake oil pressure is generated to operate the friction brake 10, and the brake #ifl! , is a well-known device that applies frictional braking force to the IJ driver 10, and is installed in the driver's seat 6 (see Figure 1). The friction braking unit 10 includes, for example, a first
This is for braking the traveling drive shaft 12 (see Figure 2) of the drive source (driving motor) that reciprocates the figure 3 on the paper surface, and the disk 13 that is fixed integrally is applied with friction pads on both sides. (not shown) is a well-known disc brake that applies pressure and brakes.

The electromagnetic pressure increasing means 11 is interposed between the manual pressure increasing means 7 and the friction iJ IJJ section 10 in the oil passage 9. That is, the electromagnetic field pressure means 11 is arranged near the manual pressure increase means 7 in the driver's seat 6. Then, as shown in FIG. 3, the brake oil population 14a and the outlet 14b
a mask cylinder l4 having a
4 and an electromagnetic drive section l5 integrally coupled via a spacer l6.

The electromagnetic drive unit 15 has a case 15[1 whose opening at one end is closed by a cover 15A, and a 'Fit magnetic coil 15D is wound around the outer periphery of a coil spool 15C housed in the case 15B. Then, there is an annular armature 15E fixed to the inner surface of the other end of the case 15B and fitted into the inner end of the coil spool 15G, and a coil spool 15G opposite to this armature 15E having a circular shape.
A cylindrical shape that is freely movable inserted into the! ! IJ iron core 15F
, three stoppers 15G are fixed to the outer surface of the cover 158, and a cylindrical movable iron core 1 is attached to the stoppers 15G.
The spring seat 15J attached to one end of 5F interferes. Also,
A rod member 1511 is inserted into the annular armature 15E and the cylindrical movable iron core 15F, and further forms a collar 15h that restricts the retreat of the movable iron core 15F.
The other end of this rod member 1511 is connected to a piston rond l4^ that moves forward and backward within the mask cylinder l4. However, it is also possible to have a structure in which the rond member 15H and the piston l4^ are integrally molded. Furthermore, the spring seat 1
A compression coil spring 15K is interposed between the rod member 5J and the flange 15h of the rod member 1 5 +1. In this FIG. 3, O
Poisoner-1 = Jkc electromagnetic coil 150 by FF signal
is demagnetized, and therefore, the cylindrical movable iron core 15F is separated from the keychain-shaped armature 15E by the spring force of the compression coil spring 15K, that is, the piston 14A opens the population 14a of the mask cylinder 14, and the electromagnetic boosting occurs in 1,000 stages. 11 (Thus, this shows a state in which no 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 adjusting the spring constant of the compression coil spring 15K. This is done by moving the adjusting bolt l7 screwed through the spring seat 15J back and forth to move the moving member 151 of the spring seat 15J back and forth.In FIG.
It consists of a button switch or a wireless signal transmitter that outputs a control signal for ON/OFF control of the first electromagnetic coil 15D. 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.
, first turn off the power of the drive source (not shown).
After L/, depress the foot pedal island of the manual pressure increase means 7 shown in Fig. 2. Since the electromagnetic boosting means 11 is maintained in the excited state shown in FIG. 3, the foot pedal 7^
By stepping on the manual pressure increasing means 7 and the friction MA ft. in the oil passage 9. In the brake oil in the IJNt section 1O, extraction pressure of a magnitude corresponding to the depression strength of the foot pedal 7^ is generated, and the friction pads of the friction braking section 10 clamp the disc 13 from both sides and brake it. Traveling drive shaft 1
By stopping the rotation of 2, it is possible to stop the C-jita 3 at a predetermined position.

On the other hand, when the driver is away from the driver's seat 6 and is moving the digit 3 along the track 2 in the direction of the page or away from the page by remote control from the floor, for example, the remote control from the floor Then, after turning on the power of the drive source, a signal is manually applied from the remote control means 18 to the electric 6/1 coil 150 of the electromagnetic boosting means 11 to excite the Ti magnetic coil 150. As a result, the cylindrical movable iron core 15F in FIG. 3 is attracted to the armature 15E while compressing the compression coil spring 15κ, and the restoring spring force of the coil spring 15K advances the rod member 1511 to the right in the drawing, and the fourth Reach the front end position of the stroke shown in the figure.
That is, the piston l4 in the mask cylinder l4 is at the inlet 1.
4a and an electromagnetic boosting means 4j that is connected to the oil passage 9.
1 and the brake oil in the friction braking part 10, more specifically, the brake oil existing between the tip 11 crystal plane of the piston l4^ and the friction braking part lO, approximately the spring constant of the compression coil spring 15κ and the cylindrical shape. A hydraulic pressure of a magnitude determined by the movable iron core 15F and the stroke amount of the rod member 1511 is generated, and the friction pads of the friction braking unit 10 clamp and brake the disk 13 from both sides, and the drive II
By slowing down the rotation of iIll2, it is possible to stop the digit 3 at a predetermined position. This braking state is controlled by the electromagnetic boosting means 1 from the remote control means l8.
The signal manually applied to the electromagnetic coil 150 of No. 1 is turned off.
F and demagnetizing the inductor coil 1511, 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 can be restored by releasing the foot pedal 78 by the spring force of a spring (not shown). It is canceled by 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! Full
12 has been described, the present invention is not limited to the above-mentioned embodiment, and the present invention is not limited to the above-mentioned embodiment.
It goes without saying that this method can be applied to other devices (not shown).

Moreover, it is naturally applicable not only to the overhead crane 5 but also to other self-propelled cranes.

Furthermore, in the above embodiment, the electric pressure boosting means 11 is connected to the manual pressure boosting means 7 in the oil passage 9 and the friction braking unit lO.
However, even if the electromagnetic pressure boosting means 11 is inserted between the reserve tank 8 and the manual pressure boosting stage 7 in the oil passage 9, the same operation as in the above embodiment can be achieved. Obtainable. (Effects of the Invention) According to the present invention, an electromagnetic boosting means for generating hydraulic pressure in an excited state to operate the friction braking section is provided in the oil passage connecting the friction braking section and the reserve tank. Since the self-propelled crane is equipped with a remote control means for ON/OFF control of the electromagnetic coil, the self-propelled crane can be braked by remote control, so it is possible to have the operator participate as an auxiliary worker in the work on the floor. This makes it possible to save labor by eliminating the waste of hiring workers from elsewhere.

Moreover, since brake oil is present as a transmission medium for braking force, it is possible to avoid sudden stops unlike well-known braking systems using electromagnetic brakes, and the swinging amplitude of the hoisted object at the stopping position is limited to a small level for safety. It has advantages such as being able to improve 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 sectional view of the non-excited (demagnetized) state. 5... Self-propelled crane (overhead crane) 7... Manual boosting means 7^... Foot pedal 8... Reserve tank 9... Oil passage lO... Friction braking unit 11... Electromagnetic Boosting means l2...travel drive shaft 150...electromagnetic coil l8...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 booster that generates hydraulic pressure in brake oil to operate the braking section, an electromagnetic booster that generates hydraulic pressure in the oil passage in an excited state to operate the friction braking section. A braking system for a self-propelled crane, characterized in that a remote control means is provided to control ON/OFF of an electromagnetic coil of the electromagnetic boosting means.