JP4041564B2 - Quantitative powder feeder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a powder and substance quantitative supply device, and more particularly to a powder and particle quantitative supply device for supplying a certain amount of powder and powder such as a master batch to a plastic molding machine or the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an apparatus for supplying a certain amount of powder particles such as resin pellets to a molding machine has been widely used in the field of plastic molding. For example, a master batch quantitative supply device as described in JP-A-1-123707 is known as this type of powder particle supply device. This master batch quantitative supply device supplies a pellet-shaped master batch in which various additives are blended to a molding machine in synchronism with a main raw material at a certain ratio.
[0003]
[Problems to be solved by the invention]
However, since powder particles such as a masterbatch are usually blended at a ratio of several percent with respect to the main raw material, in order to blend such powder particles into the main raw material at a certain ratio, It is necessary to supply quantitative accurately and accurately. In order to accurately supply quantitatively, it is preferable to supply while measuring the weight per unit time of the supplied granular material.
[0004]
On the other hand, when a powder or the like is put into a fixed amount supply device or during a supply operation to a molding machine, vibration due to disturbance may occur in the constant amount supply device, and accurate measurement is not performed due to the vibration. Sometimes.
In order to eliminate measurement errors due to vibrations, it may be possible to attach anti-vibration rubber to the device or provide a smoothing circuit, but it is difficult to respond sufficiently to instantaneous vibrations. is there.
[0005]
An object of the present invention is made to solve the above-described problems, and is capable of quantitatively supplying a granular material that can be quantitatively supplied without impairing the supply accuracy even when vibration due to disturbance occurs. Is to provide.
[0006]
[Means for Solving the Problems]
  In order to achieve the above object, the invention according to claim 1 is an apparatus for quantitatively supplying powder particles, comprising quantitative supply means for quantitatively supplying powder particles, wherein the quantitative supply means comprises: The weight control means for controlling the supply amount of the granular material according to the weight of the supplied granular material, the time control means for controlling the supply amount of the granular material according to the supply time, and the quantitative supply means are the weight control means. Switching control means for switching to control by the time control means when a predetermined switching signal is input.The quantitative supply means is controlled every predetermined control cycle, the weight control means controls when the supply amount of the granular material reaches a predetermined weight as one control cycle, and the time control means When the predetermined time is reached, control is performed as one control cycle, and when the predetermined switching signal is input, the switching control unit is controlled by the weight control unit at the time of input. Is switched to control by the time control means, and in the sampling period in which one control period is divided into a plurality, the supply amount of the granular material in one sampling period is outside the first abnormal limit range. In some cases, automatic switching input means for inputting the switching signal to the switching control means is provided.
[0007]
According to such a configuration, during normal times, the quantitative supply means can be controlled by the weight control means to accurately supply the powder particles, while on the other hand, when the powder particles are put into the quantitative supply device or molded When vibration occurs in the quantitative supply device or the like during the supply operation to the machine, the switching control means can switch from the control by the weight control means to the control by the time control means by the input from a predetermined switching signal. Even if a measurement error occurs due to the above, it is possible to quantitatively supply powder particles regardless of the measurement.
[0009]
Also,According to such a configuration, in a normal time, the quantitative supply means can be controlled by the weight control means to accurately supply the powder particles, while when vibrations due to disturbance occur, the predetermined switching signal is used. The switching control means can switch one control cycle controlled by the weight control means at the time of the input to control by the time control means, that is, control when vibration or the like occurs. Since only the cycle can be switched from the control by the weight control means to the control by the time control means, accurate quantitative supply can be ensured even when powder particles are continuously supplied.
Furthermore, since the automatic switching input means is provided, a switching signal is automatically input when the supply amount of the granular material falls outside the first abnormal limit range within one control cycle. In this case, when an abnormality occurs in the change in the supply amount, the time control means is immediately switched, so that the supply accuracy can be further improved.
[0010]
  Claim2The invention described in claim1In the invention described in the paragraph, the quantitative supply means further includes supply correction means for correcting supply conditions for each control cycle, and the supply correction means is controlled by the switching means from the control by the weight control means to the time. The supply condition of the next control cycle of the control cycle switched to the control by the control means is not corrected.
[0011]
The supply correction means can correct the supply conditions every control cycle, so that the supply accuracy can be further improved, and the switching means switches from the control by the weight control means to the control by the time control means. The supply condition of the next control cycle is not corrected, so the supply condition of the next control cycle is not corrected based on the condition of the control cycle when vibration or the like occurs. Quantitative supply can be performed without impairing the supply accuracy.
[0013]
  Claim3The invention described in claim 1Or 2In the invention described in the paragraph, the quantitative supply means further includes a vibration avoidance switch and / or a vibration detection sensor, and the vibration avoidance switch and / or the vibration detection sensor inputs the switching signal to the switching control means. It is characterized by. By providing the vibration avoidance switch, for example, when a powder or the like is introduced into the fixed amount supply device, the operator operates the vibration avoidance switch to switch from the control by the weight control means to the control by the time control means in advance. Therefore, it is possible to prevent a decrease in the accuracy of quantitative supply due to artificial vibration such as charging, and by providing a vibration detection sensor, for example, the vibration detection sensor detects vibration during the supply operation to the molding machine. In such a case, by automatically switching from the control by the weight control means to the control by the time control means, it is possible to prevent the accuracy of the quantitative supply from being lowered.
[0014]
  Claim4The invention described in claim2In the invention described in the above, the supply amount correction means is configured so that, in the last sampling period in one control period,Less change in supply than the first abnormal limit rangeWhen it is outside the second abnormal limit range, the supply condition of the next control cycle is not corrected.
FirstBy setting the range in which the supply amount change is smaller than that in the first abnormal limit range as the second abnormal limit range, the supply amount change due to light vibration occurs when the second abnormal limit range is exceeded in the last sampling cycle. If it is in the last sampling cycle, the supply accuracy of the next control cycle is not corrected based on the supply amount detected at the end of the control cycle, thereby reducing the supply accuracy. Can be prevented.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic explanatory diagram for explaining one embodiment of the powder and substance quantitative supply device of the present invention. In FIG. 1, a fixed amount supply device 1 is a device for supplying a fixed amount of a master batch as a granular material. A masterbatch is a pellet-like granular material in which additives such as colorants, stabilizers, antistatic agents, and flame retardants are dispersed in a high concentration in a thermoplastic resin. Thus, it is dispersed in the main raw material simultaneously with molding. In the present embodiment, a master batch is put into the master batch tank 2, and this master batch is supplied to the fixed amount supply device 1 by the ejector 4 as an aerodynamic transportation means via the pipe 3.
[0016]
The fixed-quantity supply apparatus 1 has a master batch supply port 8 formed in the upper part thereof and a master batch discharge port 9 formed in the lower part thereof, and a substantially cylindrical main body 5 having a funnel-like lower side, A load cell 6 provided on the gantry as a measuring means for supporting and detecting the weight of the main body 5, a screw feeder 7 as a supply means for supplying a fixed amount of the master batch, and a gate 10 as an opening / closing mechanism provided at the discharge port 9. And. The screw feeder 7 includes a feeder motor 11 as a drive source and a screw 12 for cutting out the master batch. The feeder motor 11 is disposed outside the main body 5, and the screw 12 is disposed radially outside the main body 5. It arrange | positions so that it may insert in the cylindrical supply part 13 which protrudes toward.
[0017]
The master batch supplied to the quantitative supply device 1 is quantitatively supplied from the supply unit 13 by the screw feeder 7. On the other hand, when using different types of master batches such as color change, the gate 10 is opened and the master batch remaining in the main body 5 is discharged.
The master batch that is quantitatively supplied from the supply unit 13 is received by the receiving unit 18, and then sent by the ejector 22 to the filter 21 as gas-solid separation means disposed above the molding machine 20 via the pipe 19. After being separated from air, the air passes through the pipe 23 and falls into the mixing attachment 24 of the molding machine 20. On the other hand, the resin pellets as the main raw material are stored in advance in the hopper 25 of the molding machine 20 and supplied from the hopper 25 into the molding machine 20. In the mixing attachment 24, since the master batch is continuously supplied to the resin pellets being supplied into the molding machine 20, the master batch is substantially synchronized with the resin pellets. While being supplied to the molding machine 20. The sensor 29 is a vibration detection sensor described later.
[0018]
2 shows a block diagram of a master batch supply system, FIG. 3, FIG. 4, FIG. 5, FIG. 6, FIG. 7 and FIG. 8 show flow charts for quantitative supply, and FIG. It is a figure which shows the time chart for demonstrating fixed_quantity | quantitative_supply supply. Control for quantitatively supplying the master batch will be described with reference to FIGS.
In FIG. 2, the feeder motor 11 of the screw feeder 7 is driven by receiving an output from the CPU 30. The screw 12 is rotated by driving the feed motor 11, and the master batch is cut out. Further, the weight of the master batch from the load cell 6 is input to the CPU 30. The total weight of the master batch is measured in a state where a predetermined amount of the master batch is first supplied into the main body 5, and the remaining master batch cut by the screw feeder 7 from the measured value is used as a reference. Are sequentially measured, and the amount is subtracted from the reference measurement value, and is obtained in real time. Further, a switching signal described later is input from the vibration avoidance switch 32 and the vibration detection sensor 29 provided on the operation panel 31. These CPU 30, screw feeder 7, load cell 6, vibration avoidance switch 32, and vibration detection sensor 29 constitute a fixed supply means, and the CPU 30 performs a predetermined calculation based on each input, and performs weight control and time control described later. Further, an output for supply correction control is performed on the feeder motor 11. Although not shown in FIG. 2, a metering request signal to be described later for executing control to be described later is input from the molding machine 20 to the CPU 20.
[0019]
Next, the master batch cut-out process will be described with reference to FIGS. This cut-out process is applied, for example, when the molding machine 20 is an injection molding machine. Conceptually, FIG. 9 is appropriately referred to.
In the master batch cut-out process, first, cut-out conditions are set (S1). As the cutting conditions, a control cycle T (seconds), a weight W (g) of the molded product in one control cycle T, and an addition rate P (%) of the master batch are set. From these set values, the master batch supply rate Wm (g) in one control cycle T, the master batch supply rate V (g / sec), the first abnormal limit VH1, VL1 (g / sec) of the master batch supply rate The second abnormal limits VH2 and VL2 (g / sec) and the cutting rotation speed R of the screw 12 are calculated (S2 to S5), and the initial setup is completed.
[0020]
As shown in FIG. 9, the first abnormal limit VH1, VL1 and the second abnormal limit VH2, VL2 are determined from the supply speed V based on the master batch supply speed V calculated in the initial setup. Is defined as a range (gradient) of the ratio. For example, in step 4 of FIG. 3, the upper limit VH1 and the lower limit VL1 of the first abnormal limit k3 and k4 are 80, and the second upper limit VH2 and the lower limit VL2 of the abnormal coefficients k5 and k6 are respectively. Each is input with 40. Therefore, as shown in FIG. 9, the first abnormal limit VH1, VL1 becomes an abnormal limit range wider than the second abnormal limit VH2, VL2, and thereby the first abnormal limit VH1, VL1 becomes a so-called heavy vibration limit, 2 The abnormal limits VH2 and VL2 are so-called light vibration limits.
[0021]
From the next step, control for each control cycle T is started. When the molding machine 20 is an injection molding machine, one control cycle T can correspond to the injection time required for one shot. First, an initial measurement value D0 is input at a predetermined timing from a standby state (S6) where a measurement request signal from the molding machine 20 is input (S7). The initial weighing value D0 input here is the initial weighing value at that time, that is, the first weighing value in one control cycle T. With this value as a reference, the initial weighing value D0, the master batch supply amount Wm calculated in advance, and Thus, the target (final) measured value Dt in the control cycle T is calculated (S8).
[0022]
Then, after the total elapsed time Tt is reset (S9), the screw 12 is rotated at the cutting rotation speed R of the screw 12 calculated in the initial setup and the master batch is cut out (S10), and one control cycle T The master batch supply rate Vc is calculated for each sampling period Tc obtained by dividing (S11 to S14). As shown in FIG. 5, the master batch supply speed Vc for each sampling period Tc is obtained by measuring the weight D1 of the master batch at the beginning of one sampling period Tc (S11), and when one sampling period Tc has elapsed (S12). The weight D2 of the final master batch is weighed (S13), and the weight difference D1-D2 is divided by the period Tc (S14).
[0023]
Next, it is determined whether or not the master batch supply speed Vc for each sampling period Tc is within the range of the first abnormal limits VH1 and VL1 (S15). If it is within the first abnormal limits VH1 and VL1, it is determined whether or not the vibration detection sensor 29 detects vibration (S16). When the vibration detection sensor 29 does not detect vibration, it is determined whether or not the vibration avoidance switch 32 is on (S17). If it is not in the ON state, it is determined whether or not the master batch supply speed Vc for each sampling period Tc is within the range of the second abnormal limits VH2 and VL2 (S18). If it is within the range of the second abnormal limit VH2, VL2, the sampling period Tc is added to the total elapsed time Tt (S19), and the weight D2 of the master batch measured at the time when the sampling period Tc has elapsed. Is determined whether or not the target measured value Dt calculated at the beginning of the control period T is exceeded (S20). If not, the sampling period Tc is reset (S21) and the sampling is again performed. The process returns to the step (S11 to S14) for calculating the master batch supply speed Vc for each cycle Tc. If it has exceeded, one control cycle T is terminated, and the master batch is stopped (S22).
[0024]
Thus, in one control cycle T, the master batch supply speed Vc for each sampling cycle Tc is within the range of the first abnormal limit VH1, VL1 and the second abnormal limit VH2, VL2, and the vibration detection sensor. When 29 does not detect vibration and the vibration avoidance switch 32 is not in the ON state, that is, in the steady operation state of cutting out the master batch, the weight of the master batch measured at the elapse of a certain sampling period Tc. Control is performed by weight control so that one control cycle T is terminated when D2 reaches the target measurement value Dt calculated at the beginning of the control cycle T. This state is shown in the first period in FIG.
[0025]
When the master batch cutting is stopped (S22), the master batch supply condition for the next control cycle T is corrected (S23 to S26). The correction of the supply condition includes correction of the rotational speed R of the screw 12 (S23) and correction of the supply amount Wm of the master batch (S24 to S26). First, the correction of the rotational speed R of the screw 12 (S23) is performed. Made. This correction corrects the rotational speed R of the screw 12 in the control cycle T that has just ended, and determines the rotational speed R of the screw 12 used in the next control cycle T. The total elapsed time Tt at the time of reaching is corrected as a target for correcting the rotational speed R, for example, corrected so that the total elapsed time Tt converges to the control cycle T as shown in the equation shown in step 23 of FIG. . Next, the actual weight D of the master batch after the end of one control cycle T is weighed (S24), a difference De from the calculated target measured value Dt is obtained (S25), and the error amount De is controlled in the next control. It correct | amends with respect to the supply amount Wm of the masterbatch in the period T (S26). And it returns to the standby state (S6) where the measurement request signal from the molding machine 20 is inputted, and the control of the next control cycle T is executed.
[0026]
As described above, when the supply condition of the master batch for the next control cycle T is corrected, a master batch with an accurate and reliable supply amount can be supplied for each control cycle T, thereby improving the supply accuracy. be able to.
On the other hand, when the supply rate Vc of the master batch is outside the range of the first abnormal limits VH1 and VL1 in a certain sampling period Tc in the state of weight control described above, or when the vibration detection sensor 29 detects vibration, Alternatively, when the vibration avoidance switch 32 is in the ON state, the sampling cycle Tc is added to the total elapsed time Tt (S27), and the added total elapsed time Tt exceeds the control cycle T. (S28), if not, the sampling period Tc is reset (S29), and after the sampling period Tc has elapsed (S30), the sampling period Tc is again set to the total elapsed time Tt. It is added (S27). These steps are repeated until the added total elapsed time Tt exceeds the control cycle T. When the added total elapsed time Tt exceeds the control cycle T, one control cycle T is ended, and the master batch Is stopped (S31). Then, when the master batch cutting is stopped (S31), the master batch supply condition for the next control cycle T is not corrected, and the standby state in which the weighing request signal from the molding machine 20 is input (S6). ) And the control of the next control cycle T is executed.
[0027]
Thus, in a certain sampling period Tc in one control period T, when the supply rate Vc of the master batch is outside the range of the first abnormal limits VH1 and VL1, or when the vibration detection sensor 29 detects vibration, Alternatively, when the vibration avoidance switch 32 is in the ON state, one control cycle T is ended when the weight D2 of the master batch in a certain sampling cycle Tc reaches the target measurement value Dt. The weight control is not performed, and the control is performed by the time control such that one control cycle is completed when the total elapsed time Tt reaches the control cycle T. This state is shown in the second period in FIG.
[0028]
That is, according to such control, weight control is performed in the normal operation state of cutting out the master batch, but when it is outside the range of the first abnormal limit VH1, VL1, or the vibration detection sensor 29 has detected vibration. In this case, or when the vibration avoidance switch 32 is in the ON state, a switching signal is input and control is performed by time control. Therefore, in a normal time, the master batch can be accurately and quantitatively supplied by weight control, while the master batch or the like is supplied to the quantitative supply device 1 or the like when being fed into the quantitative supply device 1 or during the supply operation to the molding machine 20. When vibration occurs, switching from weight control to time control is performed by input from these switching signals. Therefore, even if a measurement error due to vibration or the like occurs, a master batch can be supplied quantitatively regardless of the measurement. Therefore, even when vibrations or the like due to disturbance occur, it is possible to supply quantitatively without impairing the supply accuracy.
[0029]
In the master batch cut-out process of the present embodiment, since control is performed at each control cycle T, only the control cycle T when vibration or the like occurs can be switched from weight control to time control. Even in the case of continuous supply, accurate quantitative supply can be ensured.
In addition, when it is outside the range of the first abnormal limit VH1, VL1, for example, FIG. 9 shows an example in which the upper limit VL1 of the first abnormal limit in a certain sampling period Tc is exceeded. Since a switching signal for automatically switching from weight control to time control is sent, when an abnormality occurs in the change in the supply amount of the master batch in a steady operation state under weight control, that is, when heavy vibration occurs As a result, the control is immediately switched to the time control, and the supply accuracy can be improved. Further, by providing the vibration avoidance switch 32, for example, when a master batch is put into the fixed amount supply device 1, the operator turns on the vibration avoidance switch 32 and switches from weight control to time control in advance. The accuracy of quantitative supply due to artificial vibrations can be prevented from being lowered, and by providing the vibration detection sensor 29, for example, the vibration detection sensor 29 detects vibration during the supply operation to the molding machine 20. Sometimes, the switching signal from the vibration detection sensor 29 is automatically sent to switch to time control with the occurrence of vibration, thereby preventing a reduction in the accuracy of quantitative supply.
[0030]
Further, when the cut-out of the master batch is stopped (S31), the master batch supply condition for the next control cycle T is not corrected, and the standby state in which the weighing request signal from the molding machine 20 is input ( In order to return to S6), that is, since the supply condition of the next control cycle T of the control cycle T switched from the weight control to the time control is not corrected, the control cycle T is based on the occurrence of vibrations. Thus, the supply amount W of the next control cycle T is not corrected, and the quantitative supply can be performed without impairing the supply accuracy.
[0031]
On the other hand, when the supply rate Vc of the master batch of a certain sampling period Tc is outside the range of the second abnormal limits VH2 and VL2, the sampling period Tc is added to the total elapsed time Tt (S32), and then added. It is determined whether or not the total elapsed time Tt exceeds the control cycle T (S33). If not, the sampling cycle Tc is reset (S34), and the master batch is cut out every sampling cycle Tc again. The process returns to the step of calculating the speed Vc (S11 to S14). If it has exceeded, one control cycle T is ended, and the master batch cut-out is stopped (S35). When the master batch cutting is stopped (S35), the master batch supply condition for the next control cycle T is not corrected, and the standby state in which the weighing request signal is input from the molding machine 20 (S6). ) To return to the next control cycle. In the second period of FIG. 9, an example is shown in which the lower limit VL2 of the second abnormal limit is exceeded, but the sampling period Tc at that time does not exceed the control period T.
[0032]
Thus, the total elapsed time Tt when the supply rate Vc of the master batch of a certain sampling period Tc is outside the range of the second abnormal limits VH2 and VL2 and the sampling period Tc at that time is added is controlled. When the period T is reached, in other words, when it is the last sampling period Tc in the time control in the control period T, one control period T is finished, the master batch cut-out is stopped, and the next control The supply condition of the master batch with respect to the period T is not corrected. That is, according to such control, when there is a change in the supply amount D2 due to light vibration in the last sampling cycle Tc, the supply condition of the next control cycle T is corrected based on the supply amount D2. Then, since accurate supply in the next control cycle T cannot be performed, at this time, the supply condition in the next control cycle T is not corrected, thereby effectively preventing a reduction in supply accuracy. In this way, accurate quantitative supply can be continuously performed.
[0033]
The control for quantitatively supplying the master batch described above is such that the molding machine 20 molds every shot, for example, is applied to an injection molding machine, etc. For example, it can be applied to an extrusion molding machine. When applied to an extrusion molding machine or the like, in the above-described control, there is no standby step (S6) and master batch cut-off stop step (S22, S31, S35), and the control cycle T is repeated continuously. .
[0034]
Further, in the present embodiment, the screw feeder 7 is used as the supply means for supplying the master batch in a fixed amount. However, for example, a spring feeder, a belt feeder, a table feeder, and a rotary feeder can be used as long as the above control is possible. A known feeder such as a vibration feeder can be used.
Further, the quantitative supply device 1 of the present embodiment may be equipped with an automatic color changing device, a blower may be adopted as a transportation means instead of the ejector 4, and a natural drop method may be adopted. Good.
[0035]
【The invention's effect】
  As described above, according to the first aspect of the invention, normally, the quantitative supply means can be controlled by the weight control means to accurately supply the powder particles, while a measurement error due to vibration or the like occurs. In such a case, the powder particles can be supplied in a fixed amount by the control by the time control means regardless of the measurement. Therefore, even when vibrations or the like due to disturbance occur, it is possible to supply quantitatively without impairing the supply accuracy.
In addition, since only the control cycle when vibration or the like occurs can be switched from the control by the weight control means to the control by the time control means, it is possible to ensure accurate quantitative supply even when powder particles are continuously supplied. be able to.
Further, in the control by the weight control means, when the supply amount of the granular material is out of the first abnormal limit range, that is, when an abnormality occurs in the change in the supply amount, it is immediately switched to the time control means. A fixed amount can be supplied.
[0036]
ContractClaim2According to the invention described in the above, since the supply condition can be corrected for each control cycle by the supply correction means, the supply accuracy can be further improved, and the control cycle when vibration or the like occurs is provided. Therefore, the supply condition of the next control cycle is not corrected, and therefore, the quantitative supply can be performed without impairing the supply accuracy.
[0037]
ContractClaim3According to the invention described in the above, by providing the vibration avoidance switch, it is possible to switch from the control by the weight control means to the control by the time control means before the vibration occurs, and the accuracy of the quantitative supply due to the vibration is reduced in advance. In addition, by providing a vibration detection sensor, when vibration occurs, the control by the weight control means is automatically switched to the control by the time control means, thereby preventing the accuracy of the quantitative supply from being lowered. be able to.
[0038]
  Claim4According to the invention described in the above, by setting a range in which the change in supply amount is smaller than the first abnormal limit range as the second abnormal limit range,The mostWhen the second abnormal limit range is exceeded in a later sampling cycle, based on the supply amount detected at the end of the control cycle, the supply amount of the next control cycle is not corrected, A decrease in supply accuracy can be effectively prevented, and therefore accurate quantitative supply can be performed continuously.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic explanatory diagram for explaining one embodiment of a powder and substance quantitative supply device of the present invention.
FIG. 2 is a block diagram of a supply system of the quantitative supply device shown in FIG.
FIG. 3 is a flow chart for quantitatively supplying powder particles in the quantitative supply device shown in FIG. 1;
4 is a flowchart for quantitatively supplying powder particles in the quantitative supply apparatus shown in FIG. 1;
FIG. 5 is a flow chart for quantitatively supplying powder particles in the quantitative supply device shown in FIG. 1;
6 is a flowchart for quantitatively supplying powder particles in the quantitative supply apparatus shown in FIG. 1; FIG.
FIG. 7 is a flowchart for quantitatively supplying powder particles in the quantitative supply device shown in FIG. 1;
FIG. 8 is a flowchart for quantitatively supplying powder particles in the quantitative supply device shown in FIG. 1;
FIG. 9 is a diagram showing a time chart for explaining the quantitative supply of powder particles.
[Explanation of symbols]
1 Metering device
6 Load cell
7 Screw feeder
11 Feeder motor
12 screw
29 Vibration detection sensor
30 CPU
32 Vibration avoidance switch

Claims (4)

An apparatus for quantitatively supplying powder particles,
Provided with a quantitative supply means for quantitatively supplying powder and granular materials,
The quantitative supply means is a weight control means for controlling the supply amount of the granular material according to the weight of the supplied granular material;
Time control means for controlling the supply amount of the granular material according to the supply time;
A switching control means for switching to the control by the time control means when the quantitative supply means is controlled by the weight control means and a predetermined switching signal is input ;
The quantitative supply means is controlled every predetermined control cycle,
The weight control means controls when the supply amount of the granular material reaches a predetermined weight as one control cycle,
The time control means controls when a predetermined time is reached as one control cycle,
When the predetermined switching signal is input, the switching control means switches one control cycle controlled by the weight control means at the time of input to control by the time control means,
In the sampling cycle in which one control cycle is divided into a plurality, the quantitative supply unit is configured to send the switching signal to the switching control unit when the supply amount of the granular material in one sampling cycle is outside the first abnormal limit range. A device for quantitatively supplying powder particles, comprising an automatic switching input means for inputting. The quantitative supply means further comprises a supply correction means for correcting the supply conditions for each control cycle,
The supply correction unit does not correct the supply condition of the next control cycle of the control cycle switched from the control by the weight control unit to the control by the time control unit by the switching unit, The fixed-quantity supply apparatus of the granular material of Claim 1 . The quantitative supply means further includes a vibration avoidance switch and / or a vibration detection sensor, and the vibration avoidance switch and / or the vibration detection sensor inputs the switching signal to the switching control means. Item 3. The quantitative supply apparatus for powder according to Item 1 or 2 . The supply amount correcting means supplies the next control cycle when the supply amount change is outside the second abnormal limit range where the change in supply amount is less than the first abnormal limit range in the last sampling cycle in one control cycle. 3. The apparatus for quantitatively supplying powder particles according to claim 2 , wherein correction of conditions is not performed.

Images