JPS5841280B2 - Winchino Kafukaji Dou Brake Souchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a winch brake device.

Conventionally, when a winch for a crane or the like reaches an overload condition, a detector detects and displays the overload condition, and the brake is manually operated based on this display.

With such devices, brake operation is not quick or reliable when overload is reached, and combined with the fact that a single brake is usually used, there are safety problems. .

In view of these points, it is an object of the present invention to provide a brake device with excellent safety that can actuate the brake with a reliable and quick response.

The present invention includes a rope winding drum having two brakes, one of which is a ratchet type brake and the other of which is a friction type brake, an overload detector, and a control device for the brakes. When an overload is reached, the two brakes are actuated by the control device in response to a signal from the detector, and after the ratchet brake is released by the rope feeding operation, the other brake is released. It is composed of

Hereinafter, the present invention will be explained with reference to drawings of embodiments.

Figure 1 is an operational system diagram of the crane's brake system.
1 is a control device, 2 is a solenoid valve for a ratchet type brake,
3 is a ratchet type brake, 4 is a solenoid valve for a hoisting brake, and 5 is a hoisting brake.

Signals are sent to the control device 1 from detectors 11, 12, and 13, respectively, and the solenoid valve 2 is actuated when the signals are greater than a predetermined value.

The detector 11 detects the lifting load by detecting, for example, the pressure of a hydraulic cylinder on a gantry retention member of the crane, and sends it to the control device 1 along with a detection signal of the boom elevation angle from the detector 12. It compares and calculates the curve with respect to the rated allowable load stored in advance, and determines whether or not there is an overload condition.

Detector 13 detects overwinding.

FIG. 3 shows the configuration of the hoisting brake 5, in which a flange 65 is fixed to the rod 25 of the hydraulic cylinder 15, and a fixed base 40 is fixed to the rod 25 of the hydraulic cylinder 15.
A force in the direction of the arrow is applied to the rod 25 by a spring 26 supported by the rod 25 .

A ring 27 is connected to the tip of the rod 25, a link 56 is connected to the tip of the rod 55 of the mask cylinder 52, and a pin 57 provided at the tip of the link 56 is inserted into a long hole 58 formed in the link 27. movably inserted into the
Furthermore, the pin 5T is coupled to a protrusion 54 that is integral with the brake pedal 50 that rotates about a shaft 53.

28 and 59 are guide links, and the rod 25
and 55 in its axial direction.

When the braner for the hoisting drum 10 is not operated, pressure oil is supplied to the rod side of the hydraulic cylinder 15, and the rod 25 is retracted to the left in FIG. 3, as shown.

When the pressure oil on the rod side of the hydraulic cylinder 15 is released from this state, the rod 25 is moved forward in the direction of the arrow by the force of the spring 26, and the rod 55 is moved backward via the link 27.56, thereby actuating the brake of the drum 10. let

At this time, the brake pedal 5 is
0 also rotates.

Incidentally, even when the hydraulic cylinder 15 is not operated as described above, by stepping on the brake pedal 50, the protrusion 54,
The rod 55 can be moved backward through the pin 57 and the link 56 to operate the brake; in this case, the pin 5
7 moves in the elongated hole 58, so the link 27i and the rod 25 do not operate.

When an overload condition (including overwinding) is reached by signals from each detector, the solenoid valve 2 is activated.

Before this operation is performed, as shown in FIG. 1, the pressure oil line 20 for operating the tag line drum 21 is connected to the rod side of the ratchet hydraulic cylinder 14 via the solenoid valve 2, and the head of the hydraulic cylinder 14 is connected to the rod side of the ratchet hydraulic cylinder 14. Since the side is connected to the hydraulic oil tank 9 via the solenoid valve 2, the ratchet type brake 3
has been canceled.

Further, the hoisting brake 5 is also released because the pressure oil line 20 is connected to the rod side of the hydraulic cylinder 15 via the solenoid valve 4.

When the electromagnetic valve 2 is operated in this state, the rod side of the hydraulic cylinder 14 is connected to the hydraulic oil tank 9, and the pressure oil in the line 20 is sent to the head side, thereby operating the ratchet type brake 8.

At the same time, the pressure oil on the rod side of the hydraulic cylinder 15 is also returned to the hydraulic oil tank 9 through the solenoid valve 2, and the hoisting brake 5 is actuated by the force of the spring, and the brake drum 51 is fixed via the mask cylinder 52. 10
stop rotating.

FIG. 2 shows the ratchet type brake 3, where the virtual line shows the state before activation and the solid line shows the state after activation, and the actuation link 31 is rotated counterclockwise around the pivot 33 by the rod of the hydraulic cylinder 14. This causes the pawl 32 rotatably attached to the other end of the link by a shaft 34 to move upward.

The claw 32 has protrusions 35 and 36, and the protrusion 35 has a spring 39.
is attached, and a clockwise rotational force is always applied to the pawl 32, and when the brake is released, the protrusion 36 is attached to the fixed base 30.
By hitting a pin 38 fixed to the wire, the position of the temporary support line shown in the figure is maintained against the force of a spring 39.

When it moves upward from this position, it is no longer restrained by the pin 38, so it is rotated clockwise by the spring 39, and its tip engages with the ratchet wheel 6.

In addition to the first control device for operating the ratchet brake 3 and hoisting brake 5, the following second control device is provided.

That is, at the same time as the ratchet type brake 3 is activated, the limit switch 7 is activated by the protrusion 37 of the operating link 31.
．． 8 respectively operate, and these solenoid valves 4 and 1
6 respectively.

Solenoid valve 40 (when activated, pressure oil on the rod side of hydraulic cylinder 15 is returned to hydraulic oil tank 9 without going through solenoid valve 2.

In addition, before operation, the solenoid valve 16 is connected to the compressed air source 1 as shown in the figure.
9 to the clutch air chamber 1 through the solenoid valve 16.
When the solenoid valve 16 operates, the clutch air chamber 17 is opened to the atmosphere through the solenoid valve 16, and the air from the compressed air source 19 is supplied to the solenoid valve 1.
6, and the air is no longer sent to the clutch air chamber 17.

Therefore, by operating the solenoid valve 16, the supply of compressed air to the clutch air chamber 17 for the drive shaft of the hoisting drum 10 is stopped, and the air chamber 17
Release the air and release the clutch.

As a result, the hoisting drum 10 is separated from one drive shaft, and further hoisting is prevented.

In this state, the hoisting drum 10 is held by the hoisting brake 5 and the ratchet type brake 3 with the load suspended.

Next, it is necessary to lower the load from this state,
This is done using the operating lever 18 for winding up and lowering.

When the insertion lever 18 is operated in the lowering direction, the compressed air source 1
The compressed air from 9 is sent to the air chamber 28, and when this pressure reaches a certain value, the pressure switch 22 is activated.

The air chamber 23 is used for a planetary brake interposed between the drive shaft and the hoisting drum 10, and when compressed air is not sent to the air chamber 23, the planetary brake is used.
Since the brake gear rotates around the drive shaft, no rotational force is transmitted to the hoisting drum 10, but when compressed air is supplied, the planetary gear is fixed, so the hoisting drum 10 rotates in the opposite direction to the drive shaft, that is, the winding drum 10 rotates in the opposite direction to the drive shaft. It will rotate in the downward direction.

The actuation of the pressure switch 22 de-energizes the electromagnetic valve 2 via the control device 1, thereby causing the ratchet brake 3 to operate via the hydraulic cylinder 14 in the opposite direction.

That is, the actuation link 31 is activated by the iron of the hydraulic cylinder 14.
The lower end of is pulled to the left, and the operating link 31 is
When the claw 32 is moved downward by rotating clockwise around , the protrusion 36 is pushed by the pin 38, and as a result, the claw 32 is rotated counterclockwise against the force of the spring 39 and moves to the imaginary line. The position shown is reached and the engagement with the water wheel 6 is released.

At this time, the movement locus of the tip of the claw 32 is not simply a circular arc locus 60 centered on the shaft 34, but a locus in which it once retreats from the contact surface 61 and then moves outward.

Therefore, even when a pressing force is applied to the tip of the pawl 32 from the contact surface 61, smooth operation is performed without any resistance.

When the pawl 32 is disengaged from the water turbine 6, the hoisting brake 5 is in an activated state. 16 is returned to the state shown.

When the solenoid valve 4 returns, the hoisting brake 5 is released, so that lowering can be performed.

As explained above, the present invention enables reliable brake operation by using two brakes in combination, and also enables automatic and quick operation in response to an overload condition using a detector and a control device. It was designed so that

[Brief explanation of the drawing]

FIG. 1 is an operational system diagram showing an embodiment of the present invention applied to a crane, FIG. 2 is an explanatory diagram of the operation of the ratchet type brake, and FIG. 3 is an explanatory diagram of the operation of the hoisting brake. 1... Control device, 2, 4, 16... Solenoid valve, 3... Ratchet type brake, 5...
...Hoisting brake, 6...Water wheel, 7,8.
...Limit switch, 10...Hoisting drum, 11, 12, 13...Detector, 32.
·····nail.

Claims (1)

[Claims] 1. A rope winding drum having two brakes, one of which is a ratchet type brake that prevents rotation by engagement between a ratchet wheel and a pawl, and the other a friction type brake, an overload detector, and a third brake for the brake. When an overload is reached during rope winding, the first control device operates the two brakes based on a signal from the detector, and the ratchet type brake has a friction type brake. an overload automatic winch, characterized in that the second control device is configured to operate when the ratchet type brake releases the brake to release the friction type brake. Brake device.