JPH0943037A - Metering apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately meter an object to be metered such as rubber by detecting the physical change amount of a liquid due to dipping of the object in a container. SOLUTION: The cutout amount of a material rubber B and the kind thereof are inputted into a computing section and the top end of the rubber B is grasped by a holding part 2a of an elevating mechanism 2. At this time, the specific gravity corresponding to the kind of the rubber B is read out among the specific gravity data storing in the computing section in advance. Next, a cylinder 2b is driven to lower the rubber B and dip it partly in a fluid A of a container 1. At this time, the weight of the liquid A detected by a weight measuring device 3 and the stroke amount of a cylinder rod 2c detected by a liquid sensor 4 are respectively inputted in the computing section. That is, when the rubber B is partly dipped in the liquid A, the weight of the liquid A becomes equal to that at the time when the same amount of liquid A as the dipping amount of the rubber B is increased. Therefore, when the detection weight of the device 3 becomes a specific value, the part of the rubber B dipping in the liquid becomes a target cutout amount.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device used for cutting out a necessary amount from a lump of rubber which is a material for various industrial products.

[0002]

2. Description of the Related Art Generally, when kneading materials for various rubber products, a raw rubber consisting of a lump of a certain weight is added with a fraction cut out from one lump to make a necessary amount. . In this case, when cutting a fraction of the raw rubber block, the operator may judge the cutting position of the raw rubber based on the amount of division and manually cut the raw rubber. It also requires a lot of work.
Therefore, as disclosed in, for example, Japanese Patent Laid-Open No. 63-15706, there has been proposed one in which the cutting position is determined based on the length of the raw rubber and the positioning and cutting are performed mechanically. There is.

[0003]

However, although the cutting position can be accurately measured by mechanical work in the above-mentioned device, the raw material rubber is not always in a fixed shape due to its elasticity, and simply has a long length. When the amount to be cut out was determined only from the size, it was not possible to obtain a highly accurate weighing result.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a weighing device capable of always accurately weighing even an irregularly shaped object such as rubber. Especially.

[0005]

According to a first aspect of the present invention, a container containing a liquid, an elevating means for holding an object to be weighed and submerging at least a part thereof into the liquid in the container, and Since the change amount detecting means for detecting the physical change amount of the liquid in the container and the calculating means for converting the change amount of the liquid into the sinking amount of the measuring object are configured, The amount of the object that sinks into the liquid is measured as the amount of change in the liquid, and even if the object to be measured is of an irregular shape, no measurement error occurs.

According to a second aspect of the present invention, in the weighing device according to the first aspect, the change amount detecting means uses a weight detecting means for detecting an increase in the weight of the liquid.

According to a third aspect of the present invention, in the measuring apparatus according to the first aspect, the change amount detecting means uses liquid level detecting means for detecting the height of the liquid level in the container.

According to a fourth aspect of the present invention, in the weighing device according to the first, second or third aspect, since the liquid removing means for removing the liquid adhering to the object to be weighed is provided, the object to be weighed after weighing is measured. By removing the adhered liquid, it is possible to immediately shift to the next step.

[0009]

1 to 4 show an embodiment of the present invention. FIG. 1 is a perspective view of a weighing device, and FIG. 2 is a block diagram showing a control system.

This measuring device detects a weight of the liquid A, a container 1 containing a liquid A such as water, a lifting mechanism 2 for holding a raw material rubber B as an object to be measured and lowering it into the container 1. A weight measuring device 3, a liquid level sensor 4 for detecting the liquid level in the container 1, a stroke sensor 5 for detecting the amount of lowering of the raw material rubber B, and a blower 6 for blowing air to the raw material rubber B.
And a calculation unit 7 for calculating the cut length of the raw rubber B,
The control unit 8 controls the weighing operation by these configurations.

The container 1 is composed of a transparent container having an open upper surface, and its inner cross section in the horizontal direction is formed uniformly in the vertical direction.

The elevating mechanism 2 comprises a grip portion 2a having an opening / closing structure for gripping the raw material rubber B, and a cylinder 2b for elevating the grip portion 2a, and is installed above the container 1. The grip portion 2a is opened and closed by hydraulic power, power of a motor or the like, and the raw rubber B is sandwiched from both sides. Cylinder 2
b is a cylinder rod 2 that moves up and down by hydraulic pressure
c, and a grip portion 2a is attached to the lower end of the cylinder rod 2c.

The weight measuring device 3 constitutes a weight detecting means for detecting the physical change amount of the liquid A in the container 1, that is, the weight detecting means.
For example, it comprises a measuring device such as a load cell, and a container 1 containing the liquid A is placed on the upper surface thereof.

The liquid level sensor 4 constitutes a liquid level detecting means for detecting a physical change amount of the liquid A in the container 1, that is, a height of the liquid level, and an ultrasonic wave is directed toward the liquid level in the container 1, for example. It emits light, light, etc. to detect the height of the liquid surface.
It is arranged above.

The stroke sensor 5 is composed of a potentiometer or the like attached to the lifting mechanism 2, and the cylinder rod 2
The stroke amount of c is detected.

The blower 6 is composed of a duct 6a for blowing air such as warm air from a blower (not shown) and an outlet 6b attached to the tip of the duct 6a, and is provided above the container 1.

The calculation unit 7 is composed of an electronic calculator or the like and is connected to the weight measuring device 3, the liquid level sensor 4 and the stroke sensor 5. The calculation unit 7 includes an input unit 7a and an output unit 7b, and the specific gravities of various rubbers are input in advance to the input unit 7a. The kind of the raw rubber B to be weighed and the required cutting amount (mass) are arbitrary. It is designed to be input to. Also. The cutout length based on the calculation result is output from the output unit 7b.

The control unit 8 is composed of a microcomputer, and has a lifting mechanism 2, a weight measuring device 3, a liquid level sensor 4,
It is connected to the stroke sensor 5 and the blower 6.

With the weighing device configured as described above,
When determining the cutting position according to the desired cut amount of the raw material rubber B, the mass Q of the cut amount of the raw material rubber B and the type of the raw material rubber B are input, and the raw material rubber B is held by the grip portion 2a of the lifting mechanism 2. Hold the upper end of the. At that time, the material rubber B is selected from the specific gravity data stored in advance in the calculation unit 7.
The specific gravity corresponding to the type of is read. Next, as shown in FIG. 3 (a), the cylinder 2b of the lifting mechanism 2 is driven to lower the raw material rubber B, and as shown in FIG. Let it sink inside. At that time, the weight W of the liquid A detected by the weight measuring device 3, the liquid level height H detected by the liquid level sensor 4, and the stroke amount S of the cylinder rod 2c detected by the stroke sensor 5 are respectively determined. It is input to the calculation unit 7. That is, when a part of the raw material rubber B sinks into the liquid A, the weight of the liquid A becomes equal to the case where the amount of the liquid A increased by the same amount as the sinking amount of the raw material rubber B. Is ρ, and the weight before the raw material rubber B falls into the liquid A is W0, the increased weight of the liquid A is Q × ρ, so the detected weight W of the weight measuring device 3 is W = W0 + Q × ρ When (1) is reached, the sinking portion of the raw material rubber B becomes the target cutting amount.

Therefore, since the cutting position of the raw material rubber B to be obtained is the liquid level position when the detected weight W of the weight measuring device 3 becomes the formula (1), from the liquid surface to the lower end of the raw material rubber B. The length L may be calculated as the cut-out length. That is,
The liquid level height before the raw material rubber B sinks into the liquid A is H0,
The liquid level height when the weight W detected by the weight measuring device 3 becomes the formula (1) is H1, and the height position of the lower end of the raw material rubber B at that time is H1.
If the length is 2, the cutout length L is L = (H1−H0) + (H0−H2) (2). Here, the liquid level heights H0 and H1 are determined by the liquid level sensor 4
The liquid level height H2 is detected by the stroke sensor 5
It is obtained from the stroke amount S detected by. That is, the stroke amount when the lower end of the raw rubber B lowered by the lifting mechanism 2 reaches the liquid surface is S0, and the stroke amount when the detected weight W of the weight measuring device 3 becomes the formula (1) is S1.
Then, H0-H2 = S0-S1 (3) Therefore, from the equations (2) and (3), L = (H1−H0) + (S0−S1) (4) is obtained, and the cutout length L is obtained as the calculation result.
Output from

After the series of detection operations are completed,
The raw rubber B is lifted above the container 1 by the lifting mechanism 2, and the liquid A attached to the surface by the blower 6 blows air.
Is removed.

That is, the series of detection operations and the operations of the lifting mechanism 2 and the blower 6 are controlled by the controller 8. That is, as shown in the flowchart of FIG.
The weight W0 is detected by (S1), the liquid level sensor 4 detects the liquid level H0 (S2), and then the elevating mechanism 2 lowers the raw material rubber B (S3). Next, when the fluctuation (increase) of the detection value H of the liquid level sensor 4 is detected due to the lower end of the raw rubber B reaching the liquid level (S4), the stroke amount S0 is detected by the stroke sensor 5 (S).
5), the weight W detected by the weight measuring device 3 is the condition of the above formula (1),
That is, when W0 + Q × ρ or more (S6), the liquid level sensor 4 detects the liquid level height H1 (S6).
7), the stroke amount is S1 by the stroke sensor 5.
Is detected (S8). Then, the material rubber B is raised by the elevating mechanism 2 (S9), and the blower 6 is operated (S1).
0) If the predetermined time T has passed (S11), the blower 6 is stopped (S12).

As described above, according to the measuring apparatus of the present embodiment, a part of the raw material rubber B held by the elevating mechanism 2 is submerged in the liquid A contained in the container 1, and the submerged amount is the liquid A.
The length from the liquid surface to the lower end of the raw material rubber B when the desired cutout amount is calculated is calculated as the cutout length. Therefore, an unshaped material such as the raw material rubber B is calculated. Also in the above, it is possible to always determine an accurate cutting position for a desired cutting amount, and it is possible to remarkably improve the weighing accuracy. Further, after the metering operation is completed, the blower 6 blows air to remove the liquid A adhering to the surface of the raw rubber B, so that the cutting operation in the next step can be swiftly performed, and the production efficiency is improved. Can be achieved.

Although the sinking amount of the raw material rubber B is converted from the increased weight of the liquid A in the above embodiment, the weight measuring device 3 is omitted, and the liquid level sensor 4 raises the liquid level and the liquid level. It is also possible to convert the subsidence amount of the raw material rubber B from the area (constant). Further, each measuring device shown as the change amount detecting means in the above-described embodiment is a well-known device, and it goes without saying that it is possible to use a substitute having an equivalent function.

[0025]

As described above, according to the weighing devices of claims 1, 2 and 3, it is possible to always accurately measure even an irregularly shaped object to be measured, such as rubber. It can be greatly improved.

Further, according to the measuring device of claim 4, in addition to the effect of claim 1, 2 or 3, since the liquid adhering to the object air to be measured after the measurement can be removed, the next step can be promptly performed. And the production efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a weighing device showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a control system.

FIG. 3 is an operation explanatory diagram of the weighing device.

FIG. 4 is a flowchart showing the operation of the control unit.

[Explanation of symbols]

1 ... Container, 2 ... Elevating mechanism, 3 ... Weight measuring device, 4 ... Liquid level sensor, 6 ... Blower, A ... Liquid, B ... Raw material rubber.

Claims (4)

[Claims] 1. A container containing a liquid, an elevating means for holding an object to be weighed and submerging at least a part thereof into the liquid of the container, and a physical change of the liquid in the container due to the sinking of the object to be weighed. A measuring device comprising a change amount detecting means for detecting the amount and a calculating means for converting the change amount of the liquid into the sinking amount of the object to be weighed. 2. The weighing device according to claim 1, wherein the change amount detecting means is a weight detecting means for detecting an increase in the weight of the liquid. 3. The measuring device according to claim 1, wherein the change amount detecting means is a liquid level detecting means for detecting the height of the liquid level in the container. 4. The weighing device according to claim 1, further comprising a liquid removing unit that removes the liquid adhering to the object to be weighed.