JP3400866B2 - Conveyor weighing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveyor weighing device for smoothly carrying general loose materials such as sand, crushed stone, coal and cement, and grains such as wheat, soybean and rice.

[0002]

2. Description of the Related Art Conventionally, in a roller type conveyor for moving an endless belt on a plurality of roller rows to convey the goods on the belt, a load cell is interposed in a part of a supporting mechanism for axially supporting the rollers. Using a conveyor scale
The total amount of transportation is measured by measuring the change over time of the weight transported by the belt.

On the other hand, a rollerless conveyor that does not use a conveyor roller train has been recently developed. For example, there is JP-A-4-317911, which employs a double pipe structure composed of an inner pipe and an outer pipe, and runs a flexible conveyor belt along the lower inner wall of the inner pipe and the outer pipe. It is a method. Further, if necessary, air pressure may be supplied between the conveyor belt and the inner tube and the outer tube to levitate the conveyor belt to reduce friction. The rollerless method has a feature that the conveyor belt is supported by the inner wall of the pipe, so that the structure is simple and high-speed conveyance is possible with low noise and low vibration.

[0004]

In such a rollerless conveyor, when the conveyor belt running on the inner pipe is used as the forward path and the conveyor belt running on the outer pipe is used as the return path, the transport amount of the forward transport is measured. Is difficult. That is, since the double pipe structure including the inner pipe and the outer pipe is adopted, the space inside the pipe is occupied by the transported object, and it is difficult to mount the measuring device on the inner pipe and the vicinity thereof. Therefore, in the conventional rollerless conveyor, the technique for measuring the transportation amount has not been developed yet.

An object of the present invention is to provide a conveyor weighing device capable of accurately measuring the transportation amount of a rollerless conveyor with a simple structure.

[0006]

SUMMARY OF THE INVENTION The present invention is a flexible conveyor that runs in an inner gutter, an outer gutter disposed around the inner gutter, and a curved shape along the lower inner wall of the inner gutter and the outer gutter. To support the inner gutter from the outer gutter, in a conveyor weighing device comprising a belt and a gas supply means for supplying pressurized gas between the conveyor belt and the inner gutter and the outer gutter to float the conveyor belt And a load measuring unit for measuring a load applied to the supporting unit.

Further, according to the present invention, the transportation amount is calculated based on the speed measuring means for measuring the traveling speed of the conveyor belt, and the load signal from the load measuring means and the speed signal from the speed measuring means. And a calculation means of.

Further, the present invention connects the inner gutter and the outer gutter,
It is characterized in that it is provided with a connecting means for restricting lateral runout of the inner gutter.

Further, the present invention is characterized in that the outer gutter is formed of a plurality of members which are vertically separable into at least two parts and which are detachable from each other.

Further, the present invention is provided on the outer gutter and the upper part of the inner gutter,
It is characterized in that an opening is formed.

[0011]

According to the present invention, the support means for supporting the inner gutter from the outer gutter is provided, and the load measuring means such as a load cell for measuring the load applied to the support means is provided. It becomes possible to measure the load and the change over time of the object conveyed by the gutter conveyor belt with a simple structure and with high accuracy.

Further, a speed measuring means such as a touch roller for measuring the traveling speed of the conveyor belt is provided, and the transportation amount is calculated based on the load signal from the load measuring means and the speed signal from the speed measuring means. As a result, it is possible to accurately measure the conveyor transportation amount.

Further, by providing a connecting means for connecting the inner gutter and the outer gutter to restrict the lateral runout of the inner gutter, it is possible to eliminate a load measurement error caused by the lateral runout of the inner gutter, and to stabilize the load. Measurement becomes possible.

Further, since the outer gutter is formed of a plurality of members which are vertically separable at least into two parts and which are detachable from each other, the lower member is detached and the inner member is detached when the load measurement is verified. It becomes possible to suspend the verification weight on the gutter. Therefore, the verification work of load measurement is simplified and the workability is improved.

Further, since the openings are formed in the upper part of the outer gutter and the inner gutter, the verification weight can be mounted on the conveyor belt of the inner gutter from the outside when the verification of the load measurement is carried out. It will be possible. Therefore, the verification work of load measurement is simplified and the workability is improved.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall schematic view showing the principle structure of a conveyor according to the present invention, and FIG. 2 is a partially cutaway perspective view thereof. This conveyor has a structure in which an inner gutter 10 and an outer gutter 20 are arranged in a coaxial double tubular shape, and has a flexible conveyor belt 1
Runs in a curved shape along the lower inner walls of the inner gutter 10 and the outer gutter 20. The conveyor belt 1 is stretched around a head pulley 3 and a tail pulley 2 installed on both sides of the inner gutter 10 and the outer gutter 20, and the outward belt 1a passes from the tail pulley 2 through the inner gutter 10 toward the head pulley 3. After traveling, the return belt 1b moves from the head pulley 3 to the outer gutter 20.
Drive through the inside toward the tail pulley 2. The tail pulley 2 is a driven cylindrical member, the head pulley 3 is a driven rotating cylindrical member, and the conveyor belt 1 is wound around the outer peripheral surface of each cylindrical member. Therefore, the cross-sectional shape of the conveyor belt 1 is converted from a linear shape to an arc shape between the head pulley 3 and the tail pulley 2 and the inner gutter 10 and the outer gutter 20.

An input port 4 is provided near the end of the outer gutter 20 on the side of the tail pulley 2. The input port 4 is used to load the conveyed product M. The introduced conveyed product M passes through the inner gutter 10 and the outward belt 1a.
On board. When the transported article M is conveyed by the outward belt 1a and reaches the head pulley 3, the conveyor belt 1 is inverted to drop downward and be collected.

On the upstream side of the head pulley 3 in the carrying direction,
A touch roller 70 that rotates in contact with the back surface of the outward belt 1a is installed. The touch roller 70 converts the transport speed of the outward belt 1a into a rotational speed, and the belt transport speed is electrically measured by a speed measuring device 71 connected to the touch roller 70 and input to the next arithmetic device 72. To be done.

In order to reduce the running friction of the conveyor belt 1, a gas supply device 5 for supplying compressed gas such as compressed air between the conveyor belt 1 and the inner gutter 10 and the outer gutter 20.
0 is set. The gas supply device 50 includes the dustproof filter 5
For example, a blower 52 that takes in air from 1 to supply air pressure to the pipelines 53 and 54, and dampers 55 and 57 that adjust the air pressures of the pipelines 53 and 54, respectively, are provided.

A duct 21 extending along the longitudinal direction of the outer gutter 20 is installed in the lower part of the outer wall of the outer gutter 20 to connect the inner space of the duct 21 and the inner space of the outer gutter 20 as shown in FIG. A large number of communication holes 22 are formed at predetermined intervals. The duct 21 is connected to the pipeline 53 of the gas supply device 50 by the flange 56, and the air pressure adjusted by the damper 55 is supplied. The air in the duct 21 has a large number of communication holes 22.
From the back of the return belt 1b and the gutter 2
An air layer is formed between the inner wall of No. 0 and the return belt 1b. In addition, the air leaked from the air layer is the outer gutter 2
Used to increase the internal pressure of zero. Further, a plurality of flanges 56 may be installed depending on the length of the outer gutter 20, which makes it possible to make the entire air pressure distribution uniform.

On the other hand, a flange 58 for connecting to the conduit 54 of the gas supply device 50 is attached to the side wall of the outer gutter 20, and the air pressure adjusted by the damper 57 is directly supplied to the inside of the outer gutter 20. . Further, as shown in FIG. 2, a large number of communication holes 12 that communicate the inner space of the outer gutter 20 and the inner space of the inner gutter 10 are formed in the lower portion of the outer wall of the inner gutter 10 at predetermined intervals. The air in the outer gutter 20 is blown out vigorously from the large number of communication holes 12 to form an air layer between the back surface of the outward path belt 1a and the inner wall of the inner path gutter 10 to float the outward path belt 1a. A plurality of flanges 58 may be installed depending on the length of the outer gutter 20. By this, the entire air pressure distribution can be made uniform. Further, in order to prevent air pressure from leaking from the openings at both ends of the outer gutter 20, a seal member 5 is attached to a gap portion between the inner gutter 10 and the outer gutter 20 except for a passage point of the return path belt 1b.

In this way, the conveyor belt 1 is allowed to travel along the inner walls of the inner gutter 10 and the outer gutter 20 while being floated by air, so that smooth conveyance is realized.

3 and 4 are various sectional views showing an embodiment of the present invention. FIG. 3 (a) is a partial cutout of the outer gutter 20 taken along the line A1-A1 of FIG. 4 (a). 3 is a cross-sectional view, FIG.
4B is a vertical cross-sectional view in which the outer gutter 20 is partially cut out along the line A2-A2 in FIG. 4A. In addition, FIG.
4 is a sectional view taken along line A3-A3 of FIG.
3B is a sectional view taken along line A4-A4 of FIG. Compared to FIGS. 1 and 2, this conveyor has an inner gutter 1
A duct 11 for supplying air pressure to the communication hole 12 of 0 is installed, the duct 54 of FIG. 1 is connected to this duct 11, and a flange 58 for supplying air pressure to the inside of the outer gutter 20 is omitted. However, the principle of floating the conveyor belt 1 by air is the same.

An inner gutter 10a for measurement is installed separately from other inner gutters 10, and ducts 11 are connected to each other by a flexible hose 13. The inner gutter 10a is supported by three support rods 14 at three points so as to be suspended from the outer gutter 20. Three mounting seats 23 are formed on the outer gutter 20 corresponding to the positions of the support rods 14, and a disk-shaped load cell 24 having a through hole at the center is installed on each mounting seat 23. It is fixed by a nut 25 screwed with. Therefore, the load applied to the inner gutter 10 is distributed to the three support rods 14 and individually measured by each load cell 24.

In the horizontal plane passing through the center of the inner gutter 10, the inner gutter 1
Tie rods 30 that connect the 0 and the outer gutter 20 are attached at four positions by pin coupling. The tie rod 30 is a stretchable connecting member such as a turnbuckle,
By pulling and fixing, the horizontal relative position of the inner gutter 10 and the outer gutter 20 is fixed. In this way, the lateral shake of the inner gutter 10 can be stopped without obstructing the load measurement, and the load measurement error due to the lateral shake can be eliminated.

Such a measuring device is installed after the inlet 4 of the conveyor shown in FIG. When the transported article M enters the inner gutter 10a of FIG. 3 while being fed from the loading port 4 and conveyed by the outward belt 1a, the load applied to each support rod 14 changes according to the traveling position of the transported article M. , Each load cell 24 outputs a load change according to the weight of the transported object M. The measurement error can be reduced as much as possible by evaluating the average value of the measured values of each load cell 24. When the transported article M comes off the inner gutter 10a, the inner gutter 10
The load of a returns to the state before the approach.

Similarly, when the transported article M is a so-called bulk article and is continuously transported, the time change of the measured value of each load cell 24 is similarly monitored, and the load value is integrated within a predetermined measured time. The total load carried in time can be calculated.

Further, since the convey speed of the conveyor belt 1 is measured by the touch roller 70 of FIG. 1, the arithmetic unit 72 multiplies the convey speed by the load value measured by the load cell 24 to calculate the convey amount of the conveyer. That is, the transport load amount per unit time can be calculated in real time.

FIG. 5 is a cross-sectional view showing an example of the test method for the load cell 24. The outer gutter 20 is vertically separable into two parts, and is formed of a plurality of members that are detachable from each other.
In FIG. 5, the lower member is removed by a predetermined length, and the verification weight 31 having a predetermined weight is attached to the inner gutter 10. When the lower member of the outer gutter 20 is removed, the return path belt 1b extends from the front and rear outer gutters 20 and floats in the hollow, but a bifurcated holding member 32 is used so as not to contact the return path belt 1b. .

When certifying the load cell 24, first, with the proof weight 31 not attached, the load cell 24
The measured value of is stored in the arithmetic unit 72, and this is used as a reference value. Next, with the verification weight 31 attached,
The measured value of the load cell 24 is taken into the arithmetic unit 72, and this is used as a test value. Therefore, the value obtained by subtracting the reference value from the test value corresponds to the weight of the test weight 31. After that, by proportionally distributing this relationship, it becomes possible to accurately measure the weight of the transported article M.

FIG. 6A is a plan view showing another example of the test method for the load cell 24, and FIG. 6B is a vertical sectional view taken along the line A5-A5. Outer gutter 2 compared to the one in FIG.
0 and the inner gutter 10 are different in that a rectangular opening 33 along the longitudinal direction is formed in the upper part of the outer wall.

When verifying the load cell 24, first, the measured value of the load cell 24 is stored in the arithmetic unit 72 while the verification weight 31 is not placed on the outward belt 1a, and this is used as a reference value. . Next, the test weight 31
Is loaded from the opening 33 and placed on the outward belt 1a. In this state, the measured value of the load cell 24 is taken into the arithmetic unit 72, and this is used as a verification value. Therefore, the value obtained by subtracting the reference value from the test value corresponds to the weight of the test weight 31. After that, by proportionally distributing this relationship, it becomes possible to accurately measure the weight of the transported article M. In this example, the verification weight 31 can be run while being placed on the outward path belt 1a.
It is also possible to verify the variation in the measured value depending on the traveling position of the verification weight 31.

In the above description, an example in which the inner gutter 10 and the outer gutter 20 are closed tubular is shown, but at least one of the inner gutter 10 and the outer gutter 20 has an original gutter shape with an open upper part. However, the present invention can be similarly applied.

[0034]

As described above in detail, according to the present invention, it is possible to measure the load and the change over time of the object conveyed by the conveyor belt of the inner gutter with a simple structure and with high accuracy.
In addition, by measuring the traveling speed of the conveyor belt, it is possible to accurately measure the conveyor transportation amount.

Also, by preventing lateral runout of the inner gutter, stable load measurement becomes possible.

Also, the verification work of load measurement is simplified,
Workability is improved.

[Brief description of drawings]

FIG. 1 is an overall schematic diagram showing a principle configuration of a conveyor according to the present invention.

2 is a partially cutaway perspective view of the conveyor shown in FIG. 1. FIG.

3 (a) is a cross-sectional view of the outer gutter 20 shown in FIG. 4 (a) taken along a line A1-A1 with a part thereof cut away.
FIG. 4 is a vertical cross-sectional view in which the outer gutter 20 is partially cut out along the line A2-A2 in FIG.

4 (a) is a cross-sectional view taken along line A3-A3 of FIG. 3 (a), and FIG. 4 (b) is A4-A4 of FIG. 3 (a).
It is sectional drawing which followed the line.

FIG. 5 is a cross-sectional view showing an example of a test method for the load cell 24.

6 (a) is a plan view showing another example of the test method for the load cell 24, and FIG. 6 (b) is a vertical cross-sectional view taken along the line A5-A5.

[Explanation of symbols]

1 conveyor belt 1a Forward belt 1b Return belt 2 tail pulley 3 head pulley 4 slot 5 Seal member 10 Uchihi 11, 21 duct 12, 22 communication holes 14 Support rod 24 load cell 30 tie rod 31 Test weight 33 opening 20 outer gutter 50 gas supply device 70 Touch roller

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Publication 7-64405 (JP, B2) Japanese Patent Publication 6-92926 (JP, B2) Patent 3333822 (JP, B2) Patent 2517840 (JP, B2) Patent 3356555 (JP, B2) Patent 2634784 (JP, B2) Patent 2634785 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01G 11/00 B65G 15/08 B65G 15/62

Claims (5)

(57) [Claims] 1. An inner gutter, an outer gutter arranged around the inner gutter, a flexible conveyor belt that travels in a curved shape along a lower inner wall of the inner gutter and the outer gutter, and a conveyor belt and an inner gutter. And a gas supply means for supplying a pressure gas between the outer gutter and the gutter, and a supporting means for supporting the inner gutter from the outer gutter, and the supporting means. And a load measuring device for measuring a load applied to the conveyor. 2. A speed measuring means for measuring a traveling speed of a conveyor belt, and a calculating means for calculating a transportation amount based on a load signal from the load measuring means and a speed signal from the speed measuring means. The conveyor weighing apparatus according to claim 1, further comprising: 3. The conveyor weighing device according to claim 1, further comprising a connecting means for connecting the inner gutter and the outer gutter so as to restrict lateral runout of the inner gutter. 4. The conveyor weighing device according to claim 1, wherein the outer gutter is formed of a plurality of members that are vertically separable into at least two parts and are detachable from each other. 5. The conveyor weighing device according to claim 1, wherein an opening is formed in an upper portion of the outer gutter and the inner gutter.