JPS6012362A - Automatic brake device for moving body - Google Patents

Abstract

PURPOSE:To retain the braking force constant and make stopping smooth, by installing a braking weight at the horizontal arm of bent lever and a deceleration weight at the vertical arm, and by setting the moment of rotation of this braking weight larger than that of the deceleration weight. CONSTITUTION:When a switch S of an electric magnet 18 is put off, a braking weight 15 is placed on a working shaft arm 17 of a control valve 1, to push the working shaft 9. Thus brakes are applied. When decelerative force is applied to a moving body, a deceleration weight 16 receives the force oriented in the direction of Arrow b, and then the said braking force will be reduced. Because the moment of rotation owing to the drive motive of the abovementioned braking weight 15 is set larger than that owing to deceleration of the deceleration weight 16, the moving body is braked and stopped by the braking weight 15. When the deceleration increases, the braking force is relieved by the force owing to deceleration of the deceleration weight 16 to provide restitution to the initial value, so that the braking force is held constant.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to automatic braking devices for mobile bodies such as cranes, transport vehicles, and various types of transportation.

(B) Prior art and its problems In conventional automatic braking systems for moving objects, in order to achieve a smooth stop, the speed and position of the moving object must be detected using guided radio or other position/speed detection mechanisms. Controls the servo motor, servo pulp, etc. based on the detection signal,
The brake force was applied smoothly.

Therefore, there is a problem that the device becomes complicated and expensive.

It is an object of the present invention to provide a brake device that has a simple configuration and is capable of smooth automatic stopping.

09 Means for Solving the Problems In order to solve the above problems, the present invention is composed of a braking force control pulp, an electromagnet, and a weight mechanism, and the above braking force control valve has a vertical operating axis directed upward. It consists of a bending lever that is biased and swingably supports the weight mechanism, a braking weight made of a magnetic material attached to its horizontal arm, and a deceleration weight attached to its vertical arm, The braking weight is arranged above the operating shaft, the electromagnet is arranged on the braking weight, and the rotational moment of the braking weight is set to be larger than the rotational moment of the deceleration weight. be.

According to the above configuration, the brake weight is attracted by energization of the electromagnet, and when braking, the energization is cut off and the brake weight is placed on the operating shaft of the control pulp, and the input shaft is pushed by its own weight, and the brake is activated. The accompanying deceleration (negative acceleration) of the moving body causes the weight to generate a force that weakens the braking force, and the balance between the two causes the input shaft to reach its maximum force while maintaining a constant braking force. This is what causes it to push in and stop.

2) Embodiment The drawing shows an embodiment of the present invention, in which the braking force control pulp 1 has a high-pressure side population 6 and a low-pressure side lower of a power source 5 consisting of a tank 2, a hydraulic pump 3, and an accumulator 4. , it also has an output port 8 for delivering brake fluid pressure to the brake.

Moreover, this control pulp 1 has an operating shaft 9 in the vertical direction. The actuating shaft 9 is always biased upward by a spring housed inside the control pulp 1, and when the actuating shaft 9 is pushed in by overcoming the biasing force, the braking fluid pressure is increased according to the amount of pushing. Occur.

A weight mechanism 10 is provided near the control pulp 1. This mechanism 10 has a bending lever 14 consisting of a horizontal arm 12 extending horizontally from a rotating shaft 11 and a vertical arm 13 extending vertically.A brake weight 15 is attached to the tip of the horizontal arm 12, and the vertical arm A deceleration weight 16 is attached to the tip of 13.

The brake weight 15 is arranged on an actuation shaft arm 17 extending horizontally from the actuation shaft 9. This weight 15 is made of a magnetic material, and an electromagnet 1 is placed above it.
By energizing 8, it is attracted. When the weight 15 is attracted by the electromagnet 18, the weight 15 and the operating shaft arm 1
The positional relationship between the weight 15 and the electromagnet 18 is set such that a slight gap g is created between the weights 15 and 7.

In addition, the mass of the brake weight 15 is the length of the M1 horizontal arm 12, and the mass of the deceleration weight 16 is the length of the M1 vertical arm 13.
The direction of movement of the moving object is indicated by arrow a.

Now, when the switch S of the electromagnet 18 is turned off during braking,
A brake weight 15 is placed on the actuating shaft arm 17 and applies a load F to the actuating shaft 9. This load F overcomes the biasing force of the actuating shaft 9 and pushes it, thereby exerting a braking force.

On the other hand, when the brake weight 15 is placed on the actuation shaft arm 17 and the actuation shaft 9 is pushed in, the deceleration weight 16 is lifted and a force is applied in a direction that offsets the load F. If the gap g is set small, then. can be completely ignored.

Furthermore, when a braking force is exerted by pushing in the actuating shaft 9 and deceleration is applied to the moving body, the deceleration weight 16 receives a force in the opposite direction to the moving direction (see the arrow), and the braking fluid pressure due to the load F is reduced. Acts in the direction of decreasing.

The force relationship in this case can be expressed as F=(MgL−mα store)/L. However, g is the acceleration of power.

Therefore, the rotational moment due to gravity of the brake weight 15)
If MgL is set to be larger than the rotational moment mα due to the deceleration of the deceleration weight 16, braking hydraulic pressure is applied by the action of the load F, bringing the moving body to a stop. During this period, if the deceleration increases, F becomes smaller according to the above equation, the braking force is relaxed, and the deceleration returns to the previous value, so the braking force remains constant. When the moving body stops, its deceleration α becomes zero, so the maximum load from the brake weight 15 acts on the actuating shaft 9, generating a large braking force.

(e) Effects As described above, the brake device of the present invention can maintain a constant braking force and achieve a smooth stop by applying a rotational moment in the opposite direction based on deceleration to the weight mechanism. After stopping, the effect of deceleration disappears, so a large braking force can be obtained.

[Brief explanation of the drawing]

The drawing is a schematic layout diagram of the embodiment. 1... Control valve, 9... Operating shaft, 10.
... Weight mechanism, 12 ... Horizontal arm, 13 ... Vertical arm, 14 ... Bending lever, 15 ... Braking weight, 16
...Deceleration weight, 18...Electromagnet Same agent sickle 1) Text 2

Claims (1)

[Claims] It consists of a braking force control valve, an electromagnet, and a weight mechanism, and the braking force control pulp is provided with a vertical operating shaft biased upward, and a bending lever that swingably supports the weight mechanism, and a bending lever on its side. Consisting of a brake weight made of a magnetic material attached to an arm and a deceleration weight attached to the vertical arm, the brake weight is placed above the actuating shaft, and the electromagnet is placed above the brake weight. An automatic braking device for a moving body, in which the rotational moment of a braking weight is set larger than the rotational moment of a deceleration weight.