JPS603215B2 - Automatic weight balance device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a vehicle quantity balancing device.

Generally, when attached devices of different weights are attached to a vertically moving part of a measuring instrument, etc., the balance device, which has a constant equilibrium tensile force, will no longer be able to maintain balance, and the vertically moving body will fall.

In view of the above points, the present invention seeks to provide an automatic weight balance device that can automatically maintain weight balance even when attached devices of different weights are attached to a vertically moving body. It is.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. In the figure, 1' is a vertically moving body, 2 is an additional weight body attached to this, 3 is a balance body, and 4 is a connecting member. They are connected to each other by a continuous member 4 while maintaining balance on both sides of 5. Note that 6 is a pulley support fixed to the balance device main body A;
Reference numeral 6a denotes a first pulley supported by the support base 6 via a support shaft 7, and the fulcrum 5 is constituted by the support shaft 7 of the first pulley 6a. Further, a first gear 9a is attached to the machine shaft 7 so as to be rotatable integrally with the base end of the guide arm 8. A second gear 9b is meshed with this first gear 9a, and the second gear 9b is connected to a known angle detector 10 (
For example, it is attached to the tip of the rotating shaft 10a of a photoelectric rotary encoder. Further, a common weight detector 12 (for example, a strain gauge load cell) for detecting a change in the weight of the additional weight body 2 added to the vertically moving body 1 is provided between the vertically moving body 1 and the second pulley 19. It is interposed between the connecting members 4 of. Further, a connecting member fixing device 11 that fixes the connecting member 4 when attaching the additional weight body 2 and detecting an increase in its weight,
A second pulley support 20 fixed to the balance device main body A is interposed between the first pulley support 6 and the second pulley support 20 . As shown in FIG. 3, this connecting member fixing device 11 includes a fluid pressure cylinder 11a operated by air or oil pressure, and a balance device main body A.
a cylinder support base 11b fixed to the cylinder; a cording piece 11d fixed to the tip of the piston rod 11c of the cylinder;
It is equipped with a switching valve 21 for controlling the fluid pressure of the cylinder 11a, and is configured so that the connecting member 4 interposed between the cylinder body 11e and the vertical piece 11d can be fixed or opened by the expansion and contraction movement of the cylinder 11a. There is. An angle adjustment device is provided for adjusting the angle Q between the guide arm 8 and the vertical plane in accordance with the output change detected by the weight detector 12. That is, this angle adjustment device includes a nut 14 having a protrusion 13 that matches a hole 8a bored at the tip of the guide arm 8, and a screw shaft 1 screwed into the nut.
5, a drive motor 6 for rotationally driving the screw koji, and a motor support stand 18 for supporting the motor rotatably around the ball 17. and the angle detector 1
0 is the angle Q formed between the guide plate 8 and the vertical plane by the gear 9a.
, 9b, and when the angle changes to the equilibrium angle Q', a drive stop signal is sent to the drive motor 16. In this way, the vehicle quantity balancing device automatically drives the drive motor 16 until the angle Q formed by the guide arm 8 and the vertical plane becomes Q', and when the angle Q' is reached, the drive motor 16 is automatically turned off. The drive is configured to stop. Next, the operation of this device will be explained.

Now, assuming that the weight W of the vertically moving body 1, the weight W2 of the additional weight body 2, and the weight Wc of the balance body 3 are kept in equilibrium by the tensile force T, in this case, the following equilibrium condition is satisfied. I am satisfied. W, 10W2=T ■ T=WCC0SQ Now, the weight W2 of the additional weight body 2 changes (W20△W2
), the above conditional expression (2) will no longer hold, and the vertically moving body 1 and the additional weight body 2 will no longer be able to maintain their equilibrium, and will rise or fall.

In this embodiment, in this case, the switching valve 21 is switched, the connecting member fixing device 11 is activated to fix the connecting member 4 in the shortened position of the cylinder 11a, and the weight detector 12 detects the weight change ΔW2 of the additional weight body 2. is detected as an output change.

Then, the drive motor 6 is automatically driven to rotate the screw shaft 15 as shown by the chain line in FIG. 1 until the angle Q between the guide arm 8 and the vertical plane corresponding to the output becomes Q'. 14 is moved along the screw ball 15.

At the same time, the angle between the guide arm 8 and the vertical plane is detected by the angle detector 10 via the first gear 9a and second gear gb fixed to the base end of the guide arm 8. When the value changes to ', the drive of the drive motor 16 is automatically stopped.

The equilibrium condition in this case is established by the following equation. Incidentally, the relationship between the weight detector 12 and the angle detector 10 is expressed by the following equation (2).

As is clear from the above description, in the present invention, a moving body of weight WI and a balance body of weight Wc are connected to each other by a connecting member while maintaining balance on both sides of a fulcrum, and the balance body can freely move on a war platform. a weight detector for detecting a weight change ΔW2 of the weight W2 added to the moving body; An angle detector detects the angle formed by the guide arm with the vertical plane and outputs the equilibrium angle Q' based on the following formula, and the angle Q formed by the guide arm with the vertical plane is determined as the equilibrium angle by the output signal from the angle detector. An angle adjustment device for adjusting the angle Q' is provided.

Therefore, according to the present invention, when the moving body is manually moved, even if the added weight changes, the balance is automatically controlled, which prevents damage to the equipment due to the falling of the moving body, and further increases the , the operating force for lowering is equalized, which can improve workability.

Further, according to the present invention, when the movement of the moving body is automatically performed by motor drive, the same load force is applied both in raising and lowering, so position control accuracy is improved, and falling due to power outage is prevented. You can expect effects such as being able to.

[Brief explanation of the drawing]

1 is a schematic side view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line X--X in FIG. 1, and FIG. 3 is a sectional view taken along Y-Y in FIG. 1. 1...Vertical movement body, 2...Additional weight body, 3
... Balance body, 4 ... Connecting member, 5 ...
・Fulcrum, 61... Pulley support base, 6a...
First pulley, 7... Support shaft, 8... Guide arm, 9a... First gear, 9b... Second gear,
10... Angle detector, 1 1... Connecting material fixing device, 11a... Cylinder, 11b... Cylinder support base, 11c... Piston rod, 11d... Vertical piece, 1
1e...Cylinder body, 12...Weight detector, 13...Protrusion, 14...Nut, 15...・Screw shaft, 16... Drive motor, 17... Shaft, 18... Motor support stand, 1
9... Second pulley, 20... Pulley support base, 21...
・Kirifusuma valve. Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. A moving body of weight W1 and a balance body of weight Wc are connected to each other by a connecting member while maintaining balance on both sides of a fulcrum, and a guide arm on which the balance body is slidably mounted is provided. An angle formed by a vertical plane of the guide arm and a weight detector that is rotatably supported on the fulcrum around a horizontal axis and detects a weight change ΔW2 of the weight W2 added to the moving body. an angle detector that detects and outputs an equilibrium angle a' based on the following formula; and an angle that adjusts the angle a formed between the guide arm and the vertical plane to the equilibrium angle a' by the output signal from the angle detector. An automatic weight balance device, characterized in that it is provided with an adjustment device. cosα′=K+(ΔW2)/(Wc) K=(W1+W2)/(Wc) (constant)