JPS6130962B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a measuring and filling method for measuring a fixed amount of powder, granule pellets, lumps, liquids, etc. and filling them into containers, and an apparatus therefor. An example of a conventional method of this kind is to first supply less than the fixed amount of powder or granular material, such as detergent, into the space to be measured, and then to replenish the small amount by dispensing the insufficient amount. It had been. To carry out this method, an apparatus as shown in FIG. 1 was used. This device includes a filling material 100 conveyed by a supply belt conveyor 50.
is dropped into the supply hopper 51 and stored therein, and the opening/closing shutter 5
2, install a measuring bucket 53 below the supply hopper 51, attach a discharge gate 54 to the lower end opening of this measuring bucket 53,
A filling chute 55 is installed below the filling chute 55, and the empty containers 200 are sequentially conveyed below the filling chute 55.
6 is installed. When filling the container 200 with, for example, 2,650 g of the filling material 100 (e.g., detergent) stored in the supply hopper 51, first open the opening/closing shutter 52 to position A in the figure to fill approximately 84% of the amount, that is, 2,230 g. to be discharged. To discharge 2230g, open/close shutter 52 is opened for about 1.8 seconds (opening area 110cm ² ). This process is the bulk dispensing process, and then moves on to the small dispensing process to make up for the shortfall.
Add a small amount of 420g. In order to carry out this dispensing process, the opening/closing shutter 52 is squeezed to the position B in the figure, and the dispenser is discharged little by little until a fixed amount is reached. The opening area of the opening/closing shutter 52 during this dispensing step was 29.0 cm ² , and it took 2.4 seconds to discharge the shortfall of 420 g. The scale-type weighing machine 56 has one end of a rod 58 pivotally attached to a hanging member 57 for hanging a weighing bucket 53, and a weight 59 attached to the other end of the rod 58. Reference numeral 60 in the figure is a fulcrum. The opening/closing shutter 52 is structured to open/close as the cam 63 rotates in the direction of the arrow in the figure. That is, the bell crank 64 is rotated around its rotation center 0 by the cam 63, and the link 65 and the lever 67 are advanced to the left in the figure, and the pawl 66 is pushed.
The opening/closing shutter 52, which is concentric with the rotation of 6, is turned clockwise to supply the filling 100 in the supply hopper 51 to the measuring bucket 53 (position A in the figure). Then, over time, the cam 63 rotates to move the link 65 backward, and the bell crank 64
is pulled by a spring 68, and the pawl 66 and the opening/closing shutter 52 are lowered in the closing direction by their own weight. Since the radius of rotation of the cam 63 is the same for a certain period of time while the opening/closing shutter 52 is moving downward in the closing direction, the opening/closing shutter 52 remains at position B in the figure and dispenses the dispenser. Measuring bucket 5 by dispensing
When the amount of filling 100 in 3 reaches a certain amount, the measuring bucket 53 is lowered and the screw 61 attached to the hanging member is lowered.
The tip of the lever 67 pushes down the tip of the lever 67.
7 is pushed down, the pawl 66 comes off the stepped portion of the lever 67, and the opening/closing shutter 52 is fully closed. At this time, the balance type weighing machine 56 is in an equilibrium position, and the detection device 62 detects this equilibrium position.
2 opens the discharge gate 54 of the measuring bucket 53. The operations of this conventional device include: fully opening the opening/closing shutter 52 (large dispensing process), setting the opening/closing shutter 52 to the dispensing position and controlling time (dispensing process), fully closing the opening/closing shutter 52 after a certain period of time has elapsed, and setting the scale-type weighing machine 56 to the dispensing position. When the equilibrium position is reached, the detection device 62 detects the equilibrium position of the balance-type weighing device 56, and when the equilibrium position is detected, the discharge gate 54 is released, and the filling 100 weighed to a certain amount is transferred to the filling chute 55. discharge, fill the empty container 200 with the filling material 100 from the filling chute 55, fully close the discharge gate 54, move the container 200 filled with the filling material 100, and move the empty container 200 below the filling chute 55. Send to. The above-mentioned is one cycle, and by repeating this cycle, it is possible to sequentially measure and fill the liquid. This one cycle consists of filling 100
To fill 2650g, as mentioned earlier, a certain amount of the weighed filling material 100 is passed through the filling chute 55 from the weighing bucket 53 and filled into the container 200 in 1.8 seconds for the bulk dispensing process and 2.4 seconds for the small dispensing process. The process took 0.8 seconds, the process from moving the filled container 200 to resetting the empty container 200 took 0.5 seconds, and the time required to complete one cycle was 5.5 seconds. The dispensing process takes 2.4 seconds out of 5.5 seconds per cycle, or about 44% of the required time, and the ratio of the time required for weighing (large dispensing process and small dispensing process) is 4.2 seconds out of the total weighing time. It took 2.4 seconds, or about 57% of the time. We spent 57% of the time weighing to ensure accuracy, and the overall filling accuracy is ±0.7% to 1.0.
% results have been confirmed. In order to improve weighing accuracy, it is necessary to take more time for the dispensing process, but if you take more time for the dispensing process, you are faced with a dilemma: the speed will become even slower. Further, according to the conventional method and apparatus, the inertia caused by the falling of the filling material 100 during the dispensing process and the inability to control the filling material 100 while it is moving in the air,
There were limits to measurement accuracy. Furthermore, in the case of high-speed filling in the conventional method, the metering time is regulated based on the operating speed of the entire filling machine, and when the set amount of time is exceeded when the large amount is insufficient, the bulk specific gravity of the filling is reduced, or the fluidity is deteriorated. As a result, there was a risk that items with insufficient quantities would be shipped without being weighed. As another conventional example, the one described in Japanese Patent Publication No. 36-3095 is known. This is equipped with a sub-discharge device that discharges excess material from the measuring tank prior to the operation of the main discharge port, and when the material is supplied in excess of the scheduled amount, the impeller installed in the measuring tank is rotated. Due to this rotation, a small amount of material in the compartment formed between the blades is discharged from the gutter to the outside of the measuring tank. In this conventional example, vibrations caused by the rotation of the impeller are transmitted to the weighing tank, causing the scale to vibrate, which tends to cause errors at the end of weighing. Further, since the excess material is scraped out by the blade wheel, the excess material is discharged from the metering tank to the gutter intermittently or pulsatingly in small amounts in the compartments between the blades, which tends to cause variations in shutoff accuracy. Furthermore, if the material is powder or granule, depending on the type (for example, detergent), the impeller may destroy or stick to the powder, making it impossible to reuse the destroyed material. Sometimes it becomes impossible to do it. Furthermore, if a block of powder or granular material is accommodated and discharged into the compartment between the blades, the measurement accuracy is likely to be disturbed. Furthermore, it is difficult to reuse (weigh again) the excess material discharged from the measuring tank with conventional equipment, and in order to reuse it, a special device must be installed to collect the material discharged from the gutter. It had to be moved upwards. The present invention was invented in view of the above circumstances, and an object of the present invention is to provide a weighing and filling method and an apparatus therefor, which can speed up one cycle and improve weighing accuracy at the same time. Preferred embodiments of the present invention will be described below with reference to FIG. 2 and the following drawings. FIG. 2 shows the basic principle of the present invention.
A step of supplying 0 to the measuring bucket 2 is performed,
Next, the amount of filling supplied into the measuring bucket 2 is weighed by the measuring device 3, and the suction nozzle 4 is activated. The filling 100 is aspirated. Furthermore, the suction nozzle 4 weighs the filling 100 in the measuring bucket 2 while it is in operation, and when the amount has decreased to a fixed amount, the operation of the suction nozzle 4 is stopped by the control device 5, and finally the measured filling in the bucket 2 is measured. The product 100 is discharged and filled into the container 200. The filled container 200 is moved, and an empty container 200 is introduced below the measuring bucket 2. A characteristic feature of such one cycle is that first, an amount of filling material 100 exceeding the fixed amount is supplied from the supply hopper 1 to the measuring bucket 2, and then the excess amount is sucked up by the suction nozzle 4 to be transferred to the measuring bucket. 2
The method is to quantitatively measure the filling 100 in the container. FIG. 3 shows an apparatus for carrying out such a method, in which a filling 100 is transferred by a feed belt conveyor 6 and fed to a feed hopper 1, in which it is stored. At this time, the amount of supply from the supply belt conveyor 6 to the supply hopper 1 is
It is measured by level gauge 7 and kept at a constant level. An opening/closing shutter 8 is attached to the lower end opening of the supply hopper 1. The opening/closing shutter 8 is opened/closed when an opening or closing command is input from the control device 5 to the shutter drive solenoid 9. The opening/closing shutter 8 of the supply hopper opens, and the falling filling 100 is stored in a measuring bucket 2 provided below the supply hopper 1. A weighing device 3 is attached to this weighing bucket 2. As the weighing device 3, a load cell is used in the illustrated embodiment. A suction nozzle 4 is inserted into the measuring bucket 2, and a discharge pipe 10 is connected to the suction nozzle 4.
A return device 11 is connected to the return device 11.
A suction device 12 is attached to. In addition, the discharge pipe 1
A valve 13 is installed in the middle of 0. This valve 13 has a hole 10a bored in the discharge pipe 10.
When the hole 10a and the window 13a of the valve 13 match, the air flows out to the outside, the suction nozzle 4 does not operate, and the hole 10a matches the window 13a of the valve 13.
When a is closed, the suction nozzle 4 is activated. The opening and closing of the hole 10a by the valve 13 is performed by the control device 5. The suction nozzle 4 has a double pipe structure, and outside air is introduced from the surrounding gap, and the introduced outside air and the filling material 10 are mixed.
0 is sucked into the discharge pipe 10 from the central gap and discharged to the return device 11. This return device 11
is equipped with a back filter 14, by which only air is sucked into the suction device 12, and the filling 100 is passed through the chamber 15 in the return device 11.
is stored in The return filling 100a stored in this chamber 15 is discharged from the rotary valve 16 to the supply hopper 1 again. A discharge gate 17 is located at the bottom opening of the measuring bucket 2.
A gate drive solenoid 18 is attached to the discharge gate 17, and this solenoid 18 is operated in response to a command from the control device 5 to open and close the discharge gate 17. The opening/closing of the discharge gate 17 is based on the filling 10 of the suction nozzle 4.
The filling in the measuring bucket 2 is 100 by suction of 0.
When the amount reaches the fixed amount, the control device 5 reads the information from the metering device 3 and operates the valve 13 to stop the suction operation, and then operates the gate drive solenoid 18 to open the discharge gate 17 so that the filling 100 is discharged. The control device 5 reads the information from the weighing device 3 and determines whether or not all has been discharged.
operates the gate drive solenoid 18 again to close the discharge gate 17. The filling 100 discharged from the measuring bucket 2 is transferred to the filling chute 1.
9 and is filled into an empty container 200. In this way, one cycle of measuring the filling material 100 and filling it into the container 200 is summarized as follows. The opening/closing shutter 8 is fully opened, e.g. fixed at 2650
Weighing device 3 attached to measuring bucket 2, which outputs 2850g at g point,
That is, the control device 5 fully closes the opening/closing shutter 8 based on a signal from the load cell, and the control device 5 operates the valve 13 to close the hole 10a of the discharge pipe 10 and operate the suction nozzle 4, and the measuring bucket is closed. 2
The load cell (measuring device 3) detects the set weight, and the control device 5 operates the valve 13 based on the signal from the load cell to align the window 13a and the hole 10a to release bleed air. Suction (suction nozzle 4 stops operating), the control device 5 fully opens the discharge gate 17 based on a signal from the load cell when the load cell detects the set weight, or detects that the suction nozzle 4 stops operating. The filled material 100 is discharged from the measuring bucket 2 and filled into the container 200. When the filled material 100 is discharged, the measuring bucket 2
becomes empty, and the controller 5 fully closes the discharge gate 17 in response to a signal from the load cell that weighs the empty measuring bucket 2. The filled container 200 moves and the empty container 2
00 is sent into position. The suction nozzle 4 has an inner diameter of 3.3 cm ² in the gap for sucking the filling material 100, is inserted into the measuring bucket 2, and the suction force is set to -80 mmHg.
We compared the time required for weighing and filling with the conventional device shown in Figure 1. The quantitative amount at this time is 2650 g of granular synthetic detergent.

[Table] In addition, the opening area of the opening/closing shutter during conventional dispensing and the cross-sectional area of the suction nozzle 4 are made the same area.
When suctioning at 80mmHg, the time to aspirate 200g is 0.42 seconds, compared to the conventional time of 2.4 seconds to dispense 420g.
It was possible to reduce the time by about 2 seconds. Furthermore, while the linear velocity of fall during conventional dispensing of granular synthetic washed material was 21 cm/sec., the linear velocity of suction in the present invention was 67 cm/sec., which is about 3.2 times faster. . As described above, since high-speed suction and discharge is possible in the present invention, the weighing device 3 can be combined with an electrical weight detection sensor such as a wire strain gauge having a fast response speed. If a wire strain gauge with a response speed of about 0.01 seconds is used, it is faster than the suction and discharge speed of 0.42 seconds, so it can be followed sufficiently. As a result of the above-mentioned weighing and filling of 2650 g of granular synthetic detergent, the overall filling accuracy in the present invention was ±0.3 to 0.5% (compared to ±0.7 to 1.0% in the conventional method). FIG. 4 shows the device according to the invention for liquids, with a supply pipe 6' instead of the supply belt conveyor 6, a supply valve 8' instead of the opening/closing shutter 8, a suction valve 13' instead of the valve 13, and A return pipe 10' is connected from the return device 11 to the supply hopper 1, and the container 200 also serves as the measuring bucket 2. Also,
The suction nozzle 4 also serves as a supply nozzle from the supply valve 8'. As explained above, the weighing and filling method according to the present invention includes the steps of supplying a filling amount exceeding the fixed amount to be filled from the supply hopper to the measuring bucket, and supplying the filling amount exceeding the fixed amount supplied into the measuring bucket into the measuring bucket. The suction nozzle inserted into the bucket sucks up the amount of filling that exceeds the fixed amount, and the suction nozzle is in operation, and the filling in the bucket is weighed, and when the amount has decreased to the fixed amount, the suction nozzle stops operating. The method is characterized in that it consists of a step of filling the container with the material in the measuring bucket. Therefore, the filling is dropped into the air only once, and at that time, more than a fixed amount is supplied from the supply hopper to the measuring bucket, so the time required for large-scale dispensing at this time is slightly longer than in the conventional method. but,
There is no need for a dispensing process for accurate weighing as in the past, and there is no inertia due to falling during dispensing and the inability to control the filling while it is moving in the air, which prevents errors in measuring accuracy. Then, instead of this conventional dispensing process, the excess amount of filling is sucked upward using a suction nozzle, so even if the amount of suction per unit time is increased, it will not be affected by the inertia of falling as in the conventional method. do not have. The result is increased weighing speed and accuracy. According to the above-mentioned experimental example, when filling 2650g of granular synthetic washed into a container, it took 5.5 seconds for one cycle in the conventional example, but
According to the present invention, the time is 3.8 seconds or less, making it possible to increase the speed by about 31% or more. In addition, the overall filling accuracy was ±0.7 to 1.0%, but now it is ±0.3 to 0.5%.
This can be improved. In addition, in the present invention, the
Like the one described in Publication No. 3095, the weighing tank and the sub-discharge device for discharging surplus material do not contact each other, that is, the weighing bucket and the suction nozzle are not in contact with each other, so the operation of the suction nozzle does not affect the weighing section. Moreover, since the suction nozzle sucks fine particles one by one upward (without having to make coarse adjustments due to suctioning in blocks), when shutting off the suction at the end signal, Compared to general shutoff of powder fluid only, the flow velocity is constant even with the same variation in cutoff speed for blocking powder fluid floating in the suction airflow, and the flow is low density and uniform, so the cutoff accuracy is high and the powder and granular material is There is no risk of it breaking or sticking. Furthermore, recycling of surplus material is facilitated due to upward suction by the suction nozzle. As mentioned above, the weighing and filling device according to the present invention has the following features:
A supply hopper that receives and stores the filling material that is sequentially transferred, and an opening/closing mechanism that is attached to the lower end opening of the supply hopper and opens the lower end opening for a predetermined time at regular intervals to supply more than the fixed amount to be filled into the container. A shutter, a measuring bucket provided below the opening at the lower end of the supply hopper, which stores and weighs the amount of filling that is supplied when the opening/closing shutter opens, and a metering bucket that is inserted from above into the filling stored in this measuring bucket. A suction nozzle is connected to the measuring device, and when the amount of filling in the measuring bucket exceeds a set value, the suction nozzle is activated, and the suction nozzle is connected to the metering device. A control device that stops the operation of the suction nozzle when the filling reaches a set value, and a container that is attached to the lower end opening of the measuring bucket, opens the lower end opening in conjunction with the stoppage of the suction nozzle, and waits below. The device is characterized by being equipped with a discharge gate for discharging a measured amount of the filling material. Therefore, with this device, it is possible to speed up the weighing time and improve the weighing accuracy at the same time.
Furthermore, since high-speed suction is possible using the suction nozzle, an electrical weight detection sensor with a fast response speed can be combined with the weighing device, thereby further improving the weighing accuracy. Furthermore, since the suction nozzle is inserted from above,
It is easy to reuse surplus materials, and there is no need to suck up powder blocks and make rough adjustments.
There is no fear that the operation of the suction nozzle will affect the weighing section.

[Brief explanation of the drawing]

Fig. 1 is an overall schematic diagram showing a conventional device, Fig. 2 is an explanatory diagram showing the basic principle of the method of the present invention, Fig. 3 is an overall schematic diagram showing an example of the inventive device, and Fig. 4 is a measuring and filling of liquid. FIG. 2 is a schematic diagram showing the device. 1... Supply hopper, 2... Measuring bucket, 3
...Measuring device, 4...Suction nozzle, 5...Control device, 8...Opening/closing shutter, 17...Discharge gate, 100...Filling material, 200...Container.

Claims (1)

[Scope of Claims] 1. A step of supplying a quantity of filling to be filled into a container from a supply hopper to a measuring bucket, and a suction step of inserting a quantity of filling supplied into a measuring bucket into a measuring bucket. A process in which the amount of filling exceeding the fixed amount is sucked upward by the nozzle, a step in which the filling in the measuring bucket is weighed while the suction nozzle is in operation, and the operation of the suction nozzle is stopped when the amount has decreased to the fixed amount, and weighing. A weighing and filling method consisting of a process of filling the contents in a bucket into a container; 2. The metering and filling method according to claim 1, wherein in the suction step using the suction nozzle, an excess quantity suctioned by the suction nozzle is returned to the supply hopper. 3. A supply hopper that receives and stores the filling material that is sequentially transferred, and a supply hopper that is attached to the lower end opening of this supply hopper and opens the lower end opening for a predetermined time at regular intervals to supply more than the fixed amount to be filled into the container. a measuring bucket that is installed below the lower end opening of the supply hopper and stores and weighs more than a certain amount of filling that is supplied when the opening and closing shutter opens; A suction nozzle to be inserted, a measuring device that measures the filling in the measuring bucket, and a measuring device that operates the suction nozzle when the filling in the measuring bucket exceeds a set value. A control device that stops the operation of the suction nozzle when the filling reaches the set value due to suction, and a control device that is attached to the lower end opening of the measuring bucket, opens the lower end opening in conjunction with the stoppage of the suction nozzle, and waits below. A measuring and filling device comprising: a discharge gate for discharging a measured amount of filling into a container.