JPS6363054B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is configured such that each one of a pair of storage devices can be alternately and selectively linked to each one of a pair of members required to be weighed via one main weighing rod. At the same time, a mechanism for distributing objects to be weighed for both storage devices is linked to the tilting of the main rod, and when the main rod is tilted beyond a certain level on both sides of the main rod,
A drag force that restricts further tilting of the main rod is applied to temporarily keep the distribution ratio by the sorting mechanism constant, and as the weighing progresses in this state, the weight of the object to be weighed corresponds to the drag force. The present invention relates to a continuous measuring device that is provided with a predictive mechanism for allowing the main rod to tilt when the amount is increased.

The continuous weighing device with the above configuration was previously proposed by the present applicant, and even after the specified weighing and storage is completed in one storage device, the continuous weighing device continues to carry out the required weighing and storage in the other storage device. Storage and
During this time, the storage device that has finished weighing and storing is returned to its empty initial state, allowing for multiple weighing and storing operations to be carried out continuously or almost continuously without interrupting the flow of objects to be weighed, in an extremely efficient manner. It has the advantage of being able to be carried out.

At the beginning of development, a weight (predictive weight) was used as the aforementioned predictive mechanism. That is, predictive weights were connected to both sides of the main rod via flexible cables.
In this case, large flow state (maximum 100%; other is 0%)
Gradually from small flow state (e.g. 10%. In this case,
The other is 90%), and after maintaining this small flow rate state for a certain period of time due to the action of the predictive weight, that is, until the object to be weighed in an amount comparable to the weight of the predictive weight is loaded, Since it uses a step-by-step metering method that transitions to a fully closed state, the meter is fully open from beginning to end, and then fully closes all at once when a predetermined amount is detected. This has the advantage that the head error caused by the falling object to be measured can be kept small.

However, in the case of the product at the beginning of development as described above, as shown in the correlation graph of flow rate (q) versus time (t) in _FIG . ) was slow, and at the time of full closure, the support arm of the chevron-shaped distribution member and the main rod, etc. that are integrally interlocked with it, were affected by the stopper fixed at the end of its swing range. Combined with the hunting phenomenon (y′) in which the stopper repeatedly oscillates in a pulsating manner several times due to the repulsive force from the stopper when the vehicle collides with the stopper, sufficient results were still obtained in terms of suppressing the head error. It was a real situation because I couldn't do it.

As a solution to this inconvenience, the applicant has already proposed the following structure. As shown in FIG. 12, the distribution member 2 is accelerated between the support arm 5 of the distribution member 2 and the central fixed frame immediately after the main rod 3 starts swinging due to distribution supply in a small flow state. A magnet device D' is provided for rapidly tilting the valve to the fully closed state. Specifically, while permanent magnets 33, 33 are attached to the left and right sides of the central fixed frame, the magnets 33, 33 are
Adsorption plates 34, 34 made of magnetic material are attached to the support arm 5. Since the attractive magnetic force acting between the magnet 33 and the adsorption plate 34 is inversely proportional to the square of the distance between the two, it increases rapidly and at an accelerated rate as the two come closer. Therefore, by using the magnet 33 with an appropriate magnetization strength, the tilting from the large flow state (L ₂ ) to the small flow state (L ₄ ) (L ₃ ) is not affected, and Small flow state (L ₄ )
A substantial suction effect can be exerted only at a position tilted by a certain amount toward the fully closed side (S), and once the suction effect is exerted, it can be rapidly shifted to the fully closed state (S). See Figure 13.

However, it still cuts (X″)
The reality is that it was unavoidable that the curved line would cause a considerable head error corresponding to the shaded area. The reason for this is that at the beginning of the cutting operation (X''), the attractive magnetic force is small, resulting in slow movement due to weight balance.

Based on the above-mentioned technological developments, the present invention aims to rapidly perform the cutting operation from the initial stage and to make the head error much smaller than in the past, in other words, to dramatically improve the measurement accuracy. The purpose is to

The continuous weighing device according to the present invention is characterized in that, in the configuration described above, the prediction mechanism is configured such that the magnetic attraction force between the magnet and the magnetic body becomes the above-mentioned tilting restraining force.

The operation of the present invention will be explained based on FIGS. 1 and 2.

A(t) is the weight of the object to be weighed in the storage device at time t, w is the weight of the balance weight,
F ₀ is the magnetic drag force. Assuming that the flexible cord A is fully extended at time t ₁ , a・w=b・A(t ₁ ). After this, the main rod remains stationary until the time (t ₂ ) when a.w+c.F ₀ =b.A(t ₂ ) is satisfied. However, for convenience,
The weight of the magnet is omitted. The principle is the same even if the weight of the magnet is taken into account. A(t ₁ ) is 90% of the predetermined amount, A(t ₂ )
is 100% true. In the next very short time △t,
Suppose that the magnet starts moving away from the magnetic material. If the magnetic drag force at this time is F ₁ , then from the relationship F=km ² /r ² , F ₁ <<F ₀ . In addition, since A(t ₂ +Δt)>A(t ₂ ), a・w+c・F ₁ <<b・A(t ₂ +t).

In other words, the right side increases slightly and the left side decreases sharply,
As the difference increases all at once, the main rod suddenly (all at once) tilts toward the fully closed side (S). See (X) in Figure 3. It is like a tug-of-war in which one side suddenly lets go of the other side while they are at maximum tension.

As described above, according to the present invention, the cutting operation from the final point of the small flow state to the fully closed state is performed extremely rapidly from the initial stage, and the head error is made minute.
Weighing accuracy can be dramatically improved.

Hereinafter, the outline of the configuration and operation of the continuous measuring device to which the present invention is directed will be explained based on FIGS. 4A to 4D, and then specific embodiments of the present invention will be explained.

As mentioned at the beginning, this type of continuous weighing device uses one of the pair of storage devices B, B alternately to each one of the pair of weighing members C, C via one main weighing rod 3. The distribution member 2, which has a chevron shape for distributing objects to be weighed to both the storage devices B and B, is configured to be selectively linked and switchable, and is configured to have a left-right balanced state with a weight balance. 2 is supported by an upper knife edge 5a of an arm 5 integrally connected to the main rod 3, thereby forming a sorting mechanism A. 1 is a downstream port for the flow to be measured arranged above the distribution member 2; 4 is the fulcrum shaft of the main rod 3;
Reference numeral 6 denotes a tare bag received and supported by the storage device B, and 7 a support member extending downward from the storage device B, which is engaged and supported by the pivot shaft 8 of the main rod 3. Parts required for measurement C
The balance weight 9 is supported by a holder 10 attached to the main rod 3, the arm member 11 that separates the balance weight 9 from the holder 10 and lifts it, and the pair of left and right arm members 11, 11 are actuated simultaneously. The main parts include an operating lever 16 for switching between a state in which the other is inactive and the opposite state. Reference numeral 13 denotes a pivot shaft of the arm member 11, which is attached to the fixed base 12. A bar 15 pivoted on an axis directly above and parallel to the fulcrum shaft 4 of the main rod 3 is linked to the arm member 11 via a link 14, and a pair of contact members 1 are provided upright from the bar 15.
An eccentric cam 18 is arranged between 9 and 19, and this cam 1
8 and an operating lever 16 are integrally connected. 1
7 is a pivot shaft of the lever 16. Reference numeral 7a denotes a protruding pin of the support member 7, which is supported in the recess 15a of the bar 15. D is a prediction mechanism consisting of a permanent magnet 20 connected to the main rod 3 via a flexible cable 21 and a magnetic body 20A attached to the fixed part. 23
is a swing link that links the fixed frame 22 and the support member 7.

A continuous weighing device with the above-mentioned configuration is:
It operates in cycles like A to D in FIG. 4. However, Figure 4 A to D show half cycles.

FIG. 4A shows the initial state in which the object to be weighed is allowed to flow down into the tare bag 6 on the right side. In this case, by swinging the lever 16 to the right, the bar 15 is tilted via the eccentric cam 18 and the contact members 19, 19.
The pin 7a of the left side support member 7 is lifted up in the recess 15a on the left side of the bar 15 to lift up the entire left side storage device B, and at the same time, the engagement and contact between the left side support member 7 and the left side pivot shaft 8 is released, and the left side The left arm member 11 is swung downward via the link 14 to transfer and support the left balance weight 9 to the left holder 10, and at the same time the right arm member 1 is moved via the right link 14.
By swinging the right arm member 1 upward and supporting the right balance weight 9, the load on the right holder 10 is eliminated, and the main rod 3 is tilted to a lower left inclined position, and the right balance weight 9 is supported by the right arm member 11. axis 8
is brought into engagement contact with the right side support member 7, and the distribution member 2 is positioned at the leftmost end of its left-right movement range via the support arm 5.

In this state, the entire amount of the object to be weighed from the flow outlet 1 is flowing down to the right tare bag 6.

As the weight continues to flow down to the right tare 6 and its weight increases, the main rod 3 moves the right storage device B around the right pivot axis 8 so as to move downward while maintaining balance with the left balance weight 9. Gradually oscillates,
Along with this, the sorting member 2 gradually moves to the right, and the object to be weighed from the flow outlet 1 is also flowed down to the left tare 6, and the ratio of distribution to the left tare 6 and the right tare 6 is reduced. However, the right side gradually decreases and the left side increases. During this time, the left cable 21 is extended as the main rod 3 is tilted.

For example, the distribution ratio between the right side and the left side is 10%:90
%, the left cable 21 is set to be fully extended, and at this time, the attractive force between the left magnet 20 and the magnetic body 20A acts as a resistance against the tilting of the main rod 3. Therefore, until the object to be weighed flows down by a weight equivalent to the magnetic attraction force (more precisely, the weight of the magnet 20), this 10%:
The 90% distribution state shown in FIG. 4B continues for a while, and the object to be weighed flows down only a small amount to the right tare bag 6, and in a large amount to the left tare bag 6.

Then, before long, the weight of the measured object comparable to the magnetic attraction force has come down, and when it has flowed down a little further, the main rod 3, and therefore the distribution member 2, shift to the fully closed state all at once. It's like the string of a bowed bow being released from your fingers. See Figure 4c.

At this time, the left main axis 8 is attached to the left support member 7.
is in a state of engagement contact or close to it.

Next, after removing the right tare bag 6 which has reached the point where a predetermined amount of the object to be weighed has been stored and replacing it with a new empty tare bag 6, by swinging the lever 16 to the left side,
As shown in FIG. 4D, the eccentric cam 18 and the contact member 1
9, 19, the bar 15, and the links 14, 14 to swing the left arm member 11 upward, and the left holder 1
At the same time as removing the left balance weight 9 from 0, the right arm member 11 is swung downward to transfer the right balance weight 9 to the right holder 10. or,
Due to the right side recess 15a of the bar 15 and the pin 7a,
Lift up the entire right side storage device B. At this time, the attitude of the main rod 3 does not change or changes only slightly. Therefore, the sorting member 2 is in a position to allow the entire amount of the object to be weighed to flow down to the left tare bag 6. Thereafter, weighing is performed using the left storage device B and the right balance weight 9 using the left weight axis 8 as a fulcrum.

That is, the storing and weighing action for both the left and right tares 6, 6 is performed continuously without interrupting the flow of the objects to be weighed.

When weighing is being performed in the other storage device B, the object to be weighed is also flowed down to the one storage device B due to the distribution action of the distribution member 2. This state continues until the flow to the other storage device B is completely closed, and finally reaches 100%. The fully open (100%) state continues until the tare bag 6 of the other storage device B is replaced after the predetermined weighing and the lever 16 is switched and swung. When the target storage device B is moved to the metering state by switching the lever 16, the distribution member 2 gradually moves as the main rod 3 tilts, and the flow rate is changed.

Next, a specific embodiment of the magnetic attraction type prediction mechanism D according to the present invention will be described.

FIG. 5 is an enlarged version of FIG. 4.
The flexible cable 21 may be a chain, string, wire, or other suitable material.

In FIG. 6, a magnetic body 20A is connected to a flexible cable 21, and a permanent magnet 20 is attached to a fixed part.

In FIG. 7, an auxiliary weight 24 is connected to the cable 21, a permanent magnet 20 is embedded in the lower surface of the auxiliary weight 24, and a non-magnetic material 25 that supports the lower surface of the auxiliary weight 24 is provided in the fixed part, and the lower surface of the magnet 20 and the permanent magnet 20 are embedded. The retaining screw 26 of the magnetic body 20A is fastened with a nut 27 while leaving a gap 28 between them, and the vertical dimension of the gap 28 can be adjusted by operating the nut 27. Because of the air gap 28, the drag force (F ₀ ) is smaller than that of the contact type, but on the other hand,
The separation operation is easy to stabilize. Auxiliary weight 24
If the weight of is H, then c・F ₀ in the previous equation becomes c・(F ₀ +
H). Moreover, even when there is no auxiliary weight 24, the magnet 20 or the magnetic body 20
A. Since there is a weight of the cable 21, etc., if the weight, that is, the total weight acting on the main rod is I, then c・F ₀ in the previous equation should be c・(F ₀ +I), and the auxiliary weight When there is, it should be c・(F ₀ +I+H). However, the effect (sudden separation) should be affected only by the magnitude of F ₀ .

In FIG. 8, a non-magnetic material 29 is interposed between the magnetic material 20A and the magnet 20 as a liner instead of a gap, and an interfitting portion 30 is provided to prevent side slipping. F ₀ is adjusted by replacing the non-magnetic material 29 with one having different vertical dimensions.

FIG. 9 shows a type in which a gap 28 is provided, and an interfitting portion 30 is provided between a non-magnetic material 25 and a magnetic material 20A. As in FIG. 8, the existence of the interfitting portion 30 serves to keep the resistance force F ₀ constant or almost constant during repeated disconnection operations.

In FIG. 10, a rod 21A is used instead of the cable 21, and an insertion hole 31 for the rod 21A is formed in the magnetic body 20A, and a stopper 32 is attached to the tip of the rod 21A. When the stopper 32 comes into contact with the magnetic body 20A, the application of drag to the main rod 3 begins.

Of course, an appropriate combination of any of those shown in FIGS. 5 to 10 may be included, a magnet may be included as the magnetic body 20A, and an electromagnet may be considered as the magnet 20.

Incidentally, it is also effective to use a magnet device D' as represented in FIG. 12.

[Brief explanation of drawings]

The drawings illustrate embodiments of the continuous metering device according to the present invention, and FIG. 1 is a principle diagram, FIG. 2 is a graph showing changes in magnetic attraction force, FIG. 3 is a graph showing changes in flow rate, and FIG. Figures A, B, C, and D are explanatory diagrams showing the schematic structure and sequential operations; Figures 5 to 10 are side views and sectional views of main parts showing various aspects;
Figure 1 is a flow rate change graph at the time of development.
Fig. 12 is a block diagram of the improvement plan, and Fig. 13 is a flow rate change graph thereof. A... Sorting mechanism, B... Storage device, C... Parts required for measurement, D... Prediction mechanism, 3... Main rod, 20
... Magnet, 20A ... Magnetic material, 21 ... Flexible cable, 28 ... Air gap, 29 ... Non-magnetic material, 30 ...
Interlocking parts.

Claims (1)

[Scope of Claims] 1. Each one of the pair of storage devices B, B can be alternately and selectively connected to each one of the pair of members C, C that require measurement via one main rod 3 for measurement. In addition, the object-to-be-measured sorting mechanism A for both storage devices B and B is linked to the tilting of the main rod 3, and when the main rod 3 is tilted beyond a certain level on both sides of the main rod 3. , by applying a drag force that restricts further tilting of the main rod 3, the distribution ratio by the distribution mechanism A is temporarily kept constant, and as the weighing progresses in this state, the weight corresponding to the drag force is applied. In a continuous weighing device that is provided with a prediction mechanism D for allowing the main rod 3 to tilt when the amount of objects to be weighed increases, the prediction mechanism D is controlled by the magnetic attraction force between the magnet 20 and the magnetic body 20A. A continuous weighing device characterized in that it is configured such that the above-mentioned tilting regulating resistance is achieved. 2 The magnetic attraction type prediction mechanism D includes a permanent magnet 20 connected to the main rod 3 via a flexible cable 21.
The continuous measuring device according to claim 1, comprising: and a magnetic body 20A attached to the fixed part. 3 The magnetic attraction type prediction mechanism D includes a magnetic body 20A connected to the main rod 3 via a flexible cable 21.
The continuous weighing device according to claim 1, comprising: and a permanent magnet 20 attached to the fixed part. 4 Between the permanent magnet 20 and the magnetic body 20A,
The continuous measuring device according to claim 2 or 3, wherein a gap 28 or a non-magnetic material 29 is interposed in the suction/holding position. 5. The continuous measuring device according to claim 4, wherein the vertical dimensions of the air gap 28 or the non-magnetic material 29 are adjustable. 6 Between the permanent magnet 20 and the magnetic body 20A,
Claim 2: An interfitting portion 30 is provided to prevent side slipping of both the cables 20 and 20A when the cables 21 are in the suction and holding position and in the tensioned position of the cables 21.
The continuous measuring device according to any one of Items 1 to 5.