JPH10310210A - Granule passage open/close valve and granule weighing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weighing device using a passage open/close valve, capable of correctly weighing granules without causing variations, allowing very little amount of granules to be powdered, and allowing easy maintenance and control. SOLUTION: A granule weighing device includes a material supply part 20, a granule passage open/close valve 30, a weighing part 40, a releasing part 50 regulating the release of the weighed granules, and a control part 9 involving the function of controlling a pair of rollers so that the interval between them is changed according to sensor outputs. The granule passage open/close valve 30 includes a granule passing cylinder 3 made of air-permeable cloth woven from fibers, a pair of rollers 36a, 36b being parallel to each other with the granular passing cylinder 3 between them and driven by external forces, with their surfaces covered with a flexible material, and a drive mechanism opening and closing the gap between the rollers 36a, 36b. The weighing part 40 includes a weighing container 41 and sensors 42a-42d for detecting the weight of granules in the weighing container 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a granule passage opening / closing valve and a granule weighing device which are used by being inserted into a passageway of a granule material in a material adjustment process at a factory or a construction site.

[0002]

2. Description of the Related Art For example, pigments mixed with concrete are:
Since powder is easily sucked into the lungs, it must be made into a granule state as much as possible, and must not be transported, transported, or weighed to determine the mixing amount with other substances. In addition, in order to accurately measure the mixing amount, a granular material that is difficult to adhere to the equipment is suitable.

[0003] The method of transferring the granular material is, for example, a method in which a screw conveyor is charged in a transfer duct. The screw conveyor is used for feeding the granular material into a measuring container and shutting off the material at the time of measuring. Had been stopped.
In addition, the transfer of the granular material is dropped by the weight of the material, and the partition is a plate in contact with the hole through which the granular material passes.
A slide valve that slides in parallel to close the hole, or
A ball valve that closed the hole with a ball was used.

FIG. 5 is a diagram showing a conventional ready-mixed concrete coloring system including a granule measuring device. In the system shown in FIG. 5, granule pigments of two colors for coloring concrete are dropped from the flexible container bags 51a and 51b by their own weights, and are respectively stored in a storage silo 52a, a slide valve (or ball valve) in a duct 53a, or a storage valve. The weight is measured by the measuring device 54 via the silo 52b and the slide valve (or ball valve) in the duct 53b, and the concrete mixer 58 is passed through the slide valve (or ball valve) in the duct 55, the transfer tank 56, and the air transport device 57. Mixed in ready-mixed concrete.

[0005] Then, the measuring device 54 includes load cells S ₁ to S ₁ .
Is supported by a sensor, such as S _4, the container for weighing by the sensor S ₁ to S _4, detects that accumulated a predetermined amount, at which point, stop the transfer of the material (in this apparatus, the duct By closing the slide valve in 53a or 53b), the amount (weight) of the material in the measuring container is determined. A control unit 59 built in the control panel controls each unit in the concrete mixer 58 and also controls the sensors S _{1 to} S
Input the detection output of ₄ and inside the pipe duct, duct 53b
The operation of the slide valve in the inside and the duct 55 is controlled.

[0006]

However, in the above-described measuring device of the conventional apparatus, when a screw conveyor is used for transferring the granular material, the granular material is easily powdered.
Adhesion to a transfer pipe or a screw conveyor of a transfer device slows down the movement, and in extreme cases, may cause a failure such as a stop of the movement of the material. For this reason, maintenance and inspection must be performed frequently, and there has been a problem that much labor is required for equipment management.

Further, at the time of weighing, even if the sensor detects that the amount of material in the weighing container has reached a predetermined amount, and immediately stops the operation, the outflow of material from the screw conveyor does not stop immediately, and There was a disadvantage that the determination of the amount (weight) was inaccurate.

Further, when the amount of material (weight) is determined by closing the valve in the duct when the amount of the material in the measuring container reaches the predetermined amount, the predetermined amount is determined in advance by the measurement result by the sensor. Even if the valve is started to be closed shortly before reaching and the valve is completely closed just in time, there are many variations, and it is difficult to determine the exact amount of the material in the container.

Also, in the process of closing the valve, the granules near the valve are crushed and pulverized in a large amount, which not only hinders accurate measurement, but also adheres to each part of the equipment after that. There has been a problem that much labor is required for equipment maintenance management.

As described above, when the measurement is not accurate, for example, when measuring and mixing two or more pigments,
There is a serious problem that the color of the mixed pigment is slightly changed and a predetermined color cannot be obtained.

[0011] The object of the present invention is to solve these problems, to enable accurate weighing without dispersion of granules, and
An object of the present invention is to provide a granule passage opening / closing valve and a granule weighing device in which the granules are extremely rarely powdered and maintenance and management of related devices is much easier than in the past.

[0012]

In order to solve the above-mentioned problems, a first aspect of the present invention is to form a flexible and cylindrical tube,
A granule passing tube (3) for passing the granules from the inlet to the outlet of the internal space, and the rotation axis is substantially perpendicular to the traveling direction of the granules in the granule passing tube, and the passage is prevented by pressing. A pair of rollers (36) disposed substantially parallel to each other with the granule passing tube (3) interposed therebetween.
a, 36b) and the pair of rollers (36a, 36b)
Drive mechanisms (31, 32) that drive to open and close the gap
a, 32b33a33b34a to 34f, 35a, 35
b) the granule passage opening / closing valve (30).

According to a second aspect of the present invention, in the granular material passage opening / closing valve (30) according to the first aspect, a material of the granular passage cylinder (3) is a woven fabric woven from fibers,
The roller (36a, 36b) is a roller whose surface is covered with a flexible body such as rubber or sponge-like synthetic resin, and is a roller driven by an external force.
0).

[0014] The invention of claim 3 is claim 1 or claim 2.
And the granule passage opening / closing valve (30) is coupled to an inlet of the granule passage cylinder (3) of the granule passage opening / closing valve (30), and the material to be weighed is connected to the granule passage opening / closing valve (30). A material supply unit (20) for feeding in, a measuring container (41) which is disposed at an outlet of the granule passing tube (3) and temporarily stores the material to be measured discharged from the outlet, and the measuring container (41) 41) sensors (42a to 42d) for detecting physical quantities corresponding to the weights of the granules in (4)
0), a discharge unit (50) coupled to the outlet of the measuring container (41), and opening and closing the passage of the measured granules to regulate the discharge of the granules; and at least the sensors (42a to 42a-4).
2d) according to the output of the driving mechanism (31, 32a, 32b
33a33b34a-34f, 35a, 35b, etc.)
And a controller (9) having a function of controlling the granule passage opening / closing valve (30) so as to change the gap between the pair of rollers (36a, 36b).

According to a fourth aspect of the present invention, in the granule weighing apparatus according to the third aspect, the size of the granule passage is adjusted near the outlet of the supply section (20) so as to reduce the passing speed of the granules. Path restrictor valves (26a, 26b) that can be regulated
The passage throttle valve (26a, 26b) has a pair of rollers (36a, 36b) of the granule passage opening / closing valve (30) in a longitudinal direction of a cross section of the granule passage passage in the throttled state.
The granule weighing device is characterized by being parallel to the direction of the rotation axis.

[0016]

Embodiments of the present invention will be described below in more detail with reference to the drawings. FIG.
1 is an explanatory diagram (front view) schematically illustrating an example of a granule weighing device according to the present invention. As shown in FIG. 1, the embodiment of the present invention includes a set of granule passage opening / closing valves 30, and includes a material supply unit 20, a granule passage opening / closing valve 30, and a granule discharge valve 50.
And a control panel 7 having a built-in control unit 9 is directly mounted on the frame 1. The measuring container 41 is attached to the frame 1 via the sensors 14a to 14d, and forms a measuring unit 40.

FIG. 2 is a front view showing a main part of the material supply section 20. The material supply unit 20 supplies the material to be measured to the measuring unit 40 via the granule passage opening / closing valve 30 and, at the optimum speed, according to the size and quality of the passing material. This is for passing the on-off valve 30 and ensuring the valve operation. In FIG. 2, reference numeral 12 denotes a mounting plate fixed to the frame 1. On the mounting plate 12,
The storage silo 2 and the motor 21 are fixed.

A rotating shaft 22 attached to a movable portion of a motor 21 has a worm 2 meshing with a worm gear 24a.
3a and a worm 23b meshing with the worm gear 24b
Has been fixed. Worm 23a and Worm 23b
When the rotating shaft 22 rotates in a fixed direction, the worm gear 24a
And the worm gear 24b rotate in opposite directions to each other.

The granule passing tube 3 is a cylindrical tube made of cloth attached to the lower outlet of the storage silo 2 and is a part of the granule passage opening / closing valve 30. The pair of sandwiching plates 26a and 26b act as a passage throttle valve for opening and closing the granule passage passage, and are arranged such that the lower ends thereof can be pressed with the granule passage tube 3 therebetween.

Each of the sandwiching plates 26a and 26b has its root at the shaft 25a of the worm gear 24a and the worm gear 24a.
b is fixed to the shaft 25b. Then, the rotating shaft 22 is rotated by rotating the rotating shaft 22 clockwise or counterclockwise by the motor 21, so that the interval between the sandwiching plates 26a and 26b can be opened or closed as shown by a two-dot chain line in the figure. Therefore, it is possible to change the granule passing speed by expanding or narrowing the granule passing path inside the granule passing tube. It can also be completely closed.

FIG. 3 is an explanatory perspective view showing a main part of the granule passage opening / closing valve 30 of FIG. The granule passage opening / closing valve 30 is
It is coupled to the outlet of the material supply 20 and operates in conjunction with the scale 40. The supporting portions for fixing the respective portions to the frame 1 are not shown except those necessary for the explanation of the operation. The granule passing tube 3 is connected to the outlet of the material supply unit 20 and is indicated by a two-dot chain line, and has appropriate softness and air permeability depending on the quality of the material passing therethrough (the fibers (Woven) fabric formed into a tubular shape.

The pair of rollers 36a and 36b are for opening and closing the passage in the granule passage cylinder 3, and the surfaces of which are covered with a soft material such as rubber or a sponge-like synthetic resin material. The passage cylinders 3 are arranged to face each other in parallel so as to sandwich the passage cylinder 3 therebetween. The rollers 36a and 36a
The axial direction of b is made to coincide with the rotational axis direction of the sandwiching plates 26a and 26b. This is because, in a state where the passage is narrowed, the longitudinal direction of the entrance cross section of the granule passage cylinder coincides with the longitudinal direction of the passage cross section immediately before the valve is closed by the granule passage opening / closing valve 30, and the granule passage cylinder is closed. This is because the complicated flow of the granules in 3 is eliminated, and the pulverization of the granules can be minimized.

The rollers 36a and 36b are rotatably supported by roller supports 35a and 35b, respectively. The roller supporting portions 35a and 35b are provided with a rod-shaped guide rail 37.
It can move freely along a and 37b. The guide rails 37a, 37b are connected to the guide support plates 38a, 38b.
Is fixed to the frame 1 so as to be parallel to the linear portions of the belts 34c and 34f.

The motor 31 is a driving source for the rollers 36a and 36b. The torque of the motor 31 is transmitted to the pulley 32c via the pulley 32a and the belt 32b. The rotational force of the pulley 32c is applied to the pulley 34 via the shaft 33a.
a and 34d. The torque of the pulley 34a is transmitted to the pulley 34c via the belt 34b. The rotational force of the pulley 34d is applied to the pulley 34f via the belt 34e.
Conveyed to. The pulleys 34c and 34f are
b. Therefore, pulley 34
a, 34c, 34d, 34f rotate in the same direction at the same speed. The belts 32b and 34e also rotate at the same speed in the same direction.

The roller support 35a is fixed to the lower linear portions of the belts 34b and 34e.
On the other hand, the roller support 35b is connected to the belts 34b and 34e.
Are fixed to the upper straight portions. Therefore, when the roller support 35a moves to the left, the roller support 35b moves to the right. When the roller support 35a moves to the right, the roller support 35b moves to the left. When the roller support portions 35a and 35b open left and right, the roller 36a
And 36b are increased, and move in a direction to open the passage in the granule passage cylinder 3. When the roller support portions 35a and 35b approach the center, the distance between the rollers 36a and 36b is reduced, and the rollers 36a and 36b move in a direction to close the passage in the granule passage cylinder 3.

FIG. 4 is an explanatory view (front view) showing the main parts of the measuring section and the discharging section in FIG. The measuring section 40 includes a measuring container 41 for receiving and measuring the material that has passed through the inside of the granule passing tube 3 and sensors 42a to 42d.
The sensors 42a to 42d are a plurality of load cells,
A support column 14a having an upper end fixed to a part of the measuring container 41 and a lower end fixed to the fixing plate 14 of the frame 1, respectively.
To 14d. Sensors 42a to 42
“d” supports the measuring container 41 and sends a distortion output proportional to the gravity applied between the measuring container 41 and the frame 1 from the measuring unit 40 to the control unit 9.

The discharge section 50 is composed of a pair of sandwiching plates 47a and 47b for opening and closing a passage in the granule passing tube 4, and a drive mechanism including a motor 43 for driving the same. The discharge unit 50 is attached to the fixed plate 14 of the frame 1. The granule passing tube 4 is provided with a measuring container 41.
Is formed in a tubular cloth attached to the outlet of the container, and the outlet is placed in the container 5 for storing the measured material.

The pair of sandwiching plates 47a and 47b are arranged such that the lower ends thereof can be pressed with the granule passing tube 4 therebetween. Each of the sandwiching plates 47a and 47b has a gear 4 at its base.
4b and the shaft 46b of the pulley 45b. On the other hand, the rotational force of the movable portion of the motor 43 is transmitted to the meshing gear 44b via the gear 44a.
It is transmitted to the pulley 45b via the pulley 45a and the belt 45c.

Then, the motor 43 rotates and the shaft 46a
When the shaft rotates right, the shaft 46b rotates left. When the shaft 46a rotates left, the shaft 46b rotates right. Therefore, by changing the rotation direction of the motor 43, the interval between the sandwiching plates 47a and 47b can be closed as shown by a solid line or opened as shown by a two-dot chain line.
For this reason, the granule passage inside the granule passage cylinder 4 can be opened or closed.

When weighing granules according to the embodiment of FIG. 1, the storage silo 2 should be weighed with the outlet of the storage silo 2 (the entrance of the granule passage cylinder 3) closed by the sandwiching plates 26a and 26b. Charge the granules. At this time, the granule passage opening / closing valve 30 is in the open state (the rollers 36a and 36b).
Is sufficiently open), the weighing container 41 is empty, and the discharge unit 50 is closed (the sandwiching plates 47a and 47).
7b is blocking the passage in the granule passage cylinder 4).

Next, under the control of the controller 9, the interval between the sandwiching plates 26a and 26b is increased until the falling speed of the granules in the storage silo 2 reaches a predetermined speed, and the position is maintained. The dropped granules pass through the granule passing tube 3 and accumulate in the measuring container 41. As the amount of granules in the measuring container 41 increases, the outputs of the sensors 42a to 42d change, and this information is transmitted to the control unit 9.

The controller 9 controls the granule passage opening / closing valve 30 based on the outputs of the sensors 42a to 42d and controls the granule passage opening / closing valve 30 to gradually control the rollers 36a and 36b. Is narrowed, and when the weight of the granules in the measuring container 41 reaches a target value, the passage in the granule passing tube 3 is completely closed. Finally, the sandwiching plates 47a and 47b of the discharge section 50 are opened, and the measured granules are discharged from the granule passage cylinder 4 into the material container 5. The granules in the material storage container 5 are sent to a target place such as the next step by hand or by an automatic transport device (not shown).

(Modifications) Various modifications and changes are possible without being limited to the above-described embodiment, and these are also within the equivalent scope of the present invention. In the embodiment of FIG. 1, the granule weighing device having one set has been described. However, although not particularly shown, a plurality of sets of granule weighing devices similar to those shown in FIG. 1 may be prepared, and these may be incorporated into one frame. In this case, each part in each set may be partially used.

For example, in order to mix pigments of many colors, in a granule weighing device that weighs granular pigments for each color, the granules are measured in the flow of the granules from the storage silo 2 to the material container 5. The material supply unit 20 and the granule passage opening / closing valve 30 are prepared for each color of the pigment, and the outlet of the granule passage cylinder 3 for each color is connected to the measuring container 4.
1 may be inserted and measured sequentially.

When the granule passage opening / closing valve 30 or lower is used in common for each color, the granule passage cylinder 3 is made of cloth, easy to replace, and inexpensive and disposable. The passage cylinder 3 may be replaced. Also, various modifications of the structure of each part are conceivable. For example,
Form and structure of the pair of sandwiching plates 26a and 26b of the material supply unit 20 and the driving mechanism thereof, form and structure of the driving mechanism of the rollers 36a and 36b, and structure and structure of the sandwiching plates 47a and 47b of the discharging unit 50 and the driving mechanism thereof However, the present invention is not limited to those shown in FIGS.

[0036]

As described above in detail, according to the first aspect of the present invention, the granule passage opening / closing valve is formed in a flexible and cylindrical shape, and the granules pass the granules from the inlet to the outlet. A passage cylinder and a pair of rotating shafts that are substantially perpendicular to the granule passage cylinder and that are arranged substantially parallel to each other with the granule passage cylinder interposed therebetween so that the passage of the granules can be prevented by pressing. Since it includes a roller and a drive mechanism that opens and closes the gap between the rollers, the granule passage pressed by the roller in the process of squeezing and closing the valve is surrounded by a flexible cylinder, and has a high degree of freedom and flexibility. Can be transformed. Therefore, there is an effect that the chance of giving a change to the outer shape of the granules passing through the inside and powdering the granules is extremely reduced.

According to the second aspect of the present invention, in the granule passage opening / closing valve according to the first aspect, since the material of the granule passing tube is an air-permeable cloth woven with fibers, the inside of the cylinder is the granular material. When passing through, there is an effect that the tube smoothly passes without adsorbing to the inner wall unlike a material having airtightness. In addition, since the surface of the roller is covered with a flexible body such as rubber or a sponge-like synthetic resin, the contact with the granule passage cylinder is soft, and since the roller is driven by an external force, the valve is squeezed and closed. In the process, the rollers do not apply unnecessary external force to the granule passing cylinder, and do not cause unnecessary deformation. Therefore, there is an effect that powdering of the granules is further reduced.

Since the granule passing tube is made of cloth, there is an advantage that it is inexpensive and easy to replace, and that the powdered material adhering to the inside can be easily removed by tapping lightly. In addition, it can be folded, and even if a large number of various kinds are prepared, the number of storage places is small and it can be easily replaced, which is advantageous in terms of maintenance.

According to the third aspect of the present invention, the granule passage opening / closing valve, the material supply section for feeding the material to be measured into the granule passage opening / closing valve, and the material to be measured discharged from the outlet of the granule passage cylinder A measuring unit comprising a measuring container for temporarily storing the granules and a sensor for detecting the weight of the granules in the measuring container, a discharging unit for regulating the release of the measured granules, and the granules at least according to the output of the sensor Since the control unit including the function of controlling the passage opening / closing valve is provided, the amount of powdered granules to be measured can be extremely small. Therefore, there is an effect that there is little failure of the device and extremely accurate measurement can be realized.

According to a fourth aspect of the present invention, in the apparatus, a passage throttle valve is provided near the outlet of the material supply unit, the passage restricting valve being capable of regulating the size of the granule passage and regulating the passing speed of the granules. Since the longitudinal direction of the granule passage path cross section in the throttle state of the passage throttle valve is parallel to the rotation axis direction of the rollers of the granule passage opening / closing valve, the complicated flow of the granules in the granule passage cylinder is eliminated, and the granules are eliminated. There is an effect that powdering of the body can be minimized.

[Brief description of the drawings]

FIG. 1 is an explanatory view (front view) schematically showing an embodiment according to the present invention.

FIG. 2 is an explanatory view (front view) showing a main part of a material supply unit in FIG. 1;

FIG. 3 is an explanatory view (perspective view) showing a main part of the granule passage opening / closing valve of FIG. 1;

FIG. 4 is an explanatory view (front view) showing a main part of the measuring section of FIG. 1;

FIG. 5 is an explanatory view (front view) showing a concrete coloring system with a general granule measuring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 2 Storage silo 3, 4 Granule passing cylinder 5 Measured granule storage container 7 Control panel 9 Control unit 20 Material supply unit 21, 31, 43 Motor 30 Granule passage opening / closing valve 40 Metering unit 50 Discharge unit

Claims (4)

[Claims] 1. A granule passing tube, which is formed in a flexible and cylindrical shape, and through which granules pass from an inlet to an outlet of an internal space, wherein a rotation axis is in a traveling direction of the granules in the granule passing tube. A pair of rollers disposed substantially parallel to each other with the granule passing tube interposed therebetween so as to be able to prevent the passage by pressing at a substantially right angle, and driving to open and close a gap between the pair of rollers. A granule passage opening / closing valve including a driving mechanism. 2. The granule passage opening / closing valve according to claim 1, wherein the material of the granule passage cylinder is a woven fabric woven from fibers, and the roller has a rubber surface and a sponge-like synthetic material. A granule passage opening / closing valve characterized by being a roller covered with a flexible body such as a resin and driven by an external force. 3. A granule passage opening / closing valve according to claim 1 or 2, which is coupled to an inlet of a granule passage cylinder of the granule passage opening / closing valve, and transfers the material to be measured to the granule passage opening / closing valve. A material supply unit for feeding in, a measuring container which is disposed at an outlet of the granule passage cylinder and temporarily stores the material to be measured discharged from the outlet, and a physical quantity corresponding to the weight of the granules in the measuring container. A measuring unit comprising a sensor for detecting, a discharge unit coupled to an outlet of the measuring container, for opening and closing a passage of the measured granules to regulate the release of the granules, and at least according to an output of the sensor A control unit having a function of controlling the granule passage opening / closing valve so as to change a gap between the pair of rollers. 4. The granule weighing device according to claim 3, wherein the size of the granule passage is adjusted in the vicinity of an outlet of the material supply unit so that the passage speed of the granules can be regulated. A granule characterized in that a longitudinal direction of a cross section of the granule passageway in the throttled state is substantially parallel to a rotation axis direction of a pair of rollers of the granule passage opening / closing valve. Weighing device.