JP5528913B2 - Transport amount calculation device and conveyor scale - Google Patents

Description

  The present invention relates to a transport amount calculation device that calculates the transport amount of products such as products and raw materials transported by a belt conveyor, and a conveyor scale using the same.

  Conventionally, a conveyor scale has been used as an apparatus for measuring the transport amount of transported materials such as various raw materials transported by a belt conveyor (see, for example, Patent Document 1).

  FIG. 2 is a schematic configuration diagram of an example of such a conveyor scale.

  The conveyor scale measures the transport amount of the transported object 51 transported by the belt conveyor 50 and is provided in the middle of the conveyor transport path to continuously detect the load of the transported object 51 passing through. 52, a speed detector 54 that detects the speed of the conveyor belt 53 and outputs a pulse signal corresponding to the speed, a calculator 55, and a display 56.

  The load detection unit 52 is arranged in the middle of the conveyor transport path, and the length of the load detection area where the load of the transport object 51 is detected on the conveyor belt 53, that is, the load of the transport object 5 in the working length (L). To detect. The load detection unit 52 receives the load of the transported object 51 passing over the working length (L) by the two working length carrier rollers 59 and 60, and the load cell via the rod 58 supported by the fulcrum 57. Detect at 61.

  The speed detector 54 is connected to the rotation system of the downstream head pulley 62 and outputs a pulse signal proportional to the speed of the conveyor belt 53.

  The calculator 55 calculates the transport amount based on the load signal from the load cell 61 of the load detector 52 and the pulse signal from the speed detector 54, and displays the calculated transport amount on the display 56.

JP 58-95220 A

  If such a conveyor scale is operated for a long time or for a long time, various failures such as damage to the conveyor belt 53 and failure of the speed detector 54 occur.

  If the speed detector 54 breaks down, the computing unit 55 cannot obtain a pulse signal necessary for calculating the speed of the conveyor belt 53 from the speed detector 54, so that the transport amount cannot be measured from the moment of the failure. As a result, it becomes impossible to secure an accurate transportation amount, and there are many cases where the operation of the conveyor scale must be stopped.

  As an emergency measure for preventing damage caused by the suspension of the operation of the conveyor scale, a pulse signal having a fixed frequency inside the computing unit 55 is used in place of the pulse signal from the speed detector 54, so that the speed of the conveyor belt 53 is increased. There is a case where a prospective driving is performed assuming that is constant.

  However, in such a prospective operation, the pulse signal of the fixed frequency inside the calculator 55 is different in frequency from the pulse signal from the speed detector 54, so that it is necessary to perform span adjustment again.

  Here, the span adjustment will be briefly described.

  In the span adjustment, first, the operation is performed in a state in which nothing is loaded on the conveyor belt 53, which is referred to as idling operation. The transport amount at this time is zero.

  Next, as shown in FIG. 3, the test chain 63, which is a calibration weight whose weight per unit length is known, is such that the center of the length is located at the approximate center of the working length (L). While being installed on the belt 53, the conveyor belt 53 is operated at a required speed. Since the speed and the load by the test chain 63 at this time are known, the transport amount is known.

  The span (coefficient) is adjusted so that the transport amount during the idling operation is zero and the transport amount during the operation by the test chain 63 is the known transport amount.

  Since the span adjustment is performed using the speed detector 54 before the failure, when a pulse signal having a fixed frequency inside the arithmetic unit 55 different from the speed detector 54 is used, it is necessary to perform the span adjustment again. is there.

  As described above, the span adjustment must be performed with the test chain 63 installed at a predetermined position on the conveyor belt 53, which is extremely troublesome and requires considerable time and effort to start the expected operation. There is a problem that it requires.

  The present invention has been made paying attention to such a situation, and enables a prospective operation to be started without having to perform the above-mentioned troublesome span adjustment when a speed detector fails. For the purpose.

  In order to achieve the above object, the present invention is configured as follows.

(1) The transport amount calculation device of the present invention includes a load signal from a load detection unit that detects a load of a transported object transported by a conveyor belt, and a pulse signal from a speed detection unit that detects the speed of the conveyor belt. Based on the above, a transport amount calculation device comprising a calculation unit for calculating the transport amount of the package, in place of a pulse oscillation unit that oscillates a pulse signal having a variable frequency, and a pulse signal from the speed detection unit A switching unit that switches and outputs the pulse signal of the pulse oscillation unit to the calculation unit, a speed average value calculation unit that calculates a speed average value of the conveyor belt based on the pulse signal from the speed detection unit, and the speed A storage unit that updates and stores a speed average value of the conveyor belt calculated by an average value calculation unit, a speed display unit that performs display corresponding to the detected speed of the conveyor belt, and A frequency setting unit for manually setting the oscillation frequency of the pulse signal of the pulse oscillation unit, the oscillation frequency of the pulse signal of the pulse oscillation unit is the speed average value of the conveyor belt updated and stored in the storage unit, Alternatively, it is varied based on the setting of the frequency setting unit .

  The pulse oscillating unit is preferably capable of changing the frequency of the pulse signal in a stepless manner.

  According to the transport amount calculation device of the present invention, the calculation unit that calculates the transport amount based on the load signal from the load detection unit and the pulse signal from the speed detection unit includes the pulse signal from the speed detection unit. Instead of this, a pulse signal from a pulse oscillating unit having a variable frequency can be input. Therefore, when the speed detection unit fails and the pulse signal of the speed detection unit cannot be used, the frequency of the pulse signal of the speed detection unit By outputting a pulse signal having a frequency corresponding to 1, for example, a pulse signal having the same frequency or an approximate frequency from the pulse oscillating unit and inputting the pulse signal to the calculating unit, the calculating unit can calculate the transport amount. As a result, when the speed detector breaks down, the expected operation can be started without performing troublesome span adjustment as in the prior art.

In the present invention, a speed average value calculation unit that calculates a speed average value of the conveyor belt based on a pulse signal from the speed detection unit, and a speed average value of the conveyor belt that is calculated by the speed average value calculation unit are updated. A storage unit is provided for storing, and the oscillation frequency of the pulse signal of the pulse oscillation unit can be varied based on the average speed value updated and stored in the storage unit .

  The speed information may be information related to the speed such as the speed based on the pulse signal from the speed detection unit, the average value of the speed, or the frequency of the pulse signal corresponding to the speed.

It is preferable that the storage unit stores a speed average value immediately before a pulse signal cannot be obtained due to a failure of the speed detection unit.

According to the present invention , since the average speed of the conveyor belt based on the pulse signal from the speed detection unit is updated and stored, when the speed detection unit fails and the pulse signal of the speed detection unit cannot be used, immediately before the failure occurs. On the basis of the speed average value updated and stored in the above , the pulse signal corresponding to the frequency of the pulse signal from the speed detection unit is output from the pulse oscillation unit and input to the calculation unit. It becomes possible to calculate the transport amount using the average speed value of the conveyor belt immediately before.

In the present invention , a frequency setting unit for manually setting the oscillation frequency of the pulse signal of the pulse oscillation unit is provided.

  The frequency setting unit may directly set the oscillation frequency, or may indirectly set the oscillation frequency corresponding to the speed by setting the speed.

According to the present invention , the frequency of the pulse signal of the speed detection unit during normal operation is grasped in advance, and when the speed detection unit fails, the grasped frequency is set from the frequency setting unit, The pulse oscillating unit outputs a pulse signal having a set frequency and inputs the pulse signal to the calculating unit, and the calculating unit can calculate the transport amount.

( 2 ) In another preferred embodiment of the transport amount calculation device of the present invention, an abnormality detection unit that detects an abnormality of the speed detection unit, and a notification unit that notifies the abnormality detection unit when an abnormality is detected. The switching unit switches and outputs the pulse signal according to the presence or absence of an abnormality detected by the abnormality detection unit.

  According to this embodiment, when the speed detection unit fails and an abnormality is detected, instead of the pulse signal from the speed detection unit, the pulse signal from the pulse oscillation unit is input to the calculation unit. The transport amount can be calculated.

( 3 ) A conveyor scale according to the present invention includes a transport amount calculation device according to the present invention, the load detection unit that detects a load of the transported object that passes through a load detection region in the middle of the transport path of the conveyor belt, And a speed detection unit that outputs the pulse signal corresponding to the speed of the conveyor belt.

  According to the conveyor scale of the present invention, when the speed detection unit fails and the pulse signal of the speed detection unit cannot be used, a pulse signal corresponding to the frequency of the pulse signal of the speed detection unit is output from the pulse oscillation unit. By inputting to the calculation unit, the calculation unit can calculate the transport amount, and the expected operation can be performed without performing the troublesome span adjustment as in the prior art.

  Thus, according to the present invention, instead of the pulse signal from the speed detection unit, the calculation unit that calculates the transport amount based on the load signal from the load detection unit and the pulse signal from the speed detection unit. Since the pulse signal from the pulse oscillation unit with variable frequency can be input, the pulse corresponding to the frequency of the pulse signal of the speed detection unit can be used when the speed detection unit fails and the pulse signal of the speed detection unit cannot be used. By outputting the signal from the pulse oscillating unit and inputting the signal to the calculating unit, the calculating unit can calculate the transport amount. As a result, when the speed detector for detecting the speed of the conveyor belt of the conveyor scale breaks down, it is possible to perform the expected operation without performing the troublesome span adjustment as in the conventional case.

FIG. 1 is a diagram showing a configuration of a conveyor scale according to an embodiment of the present invention. FIG. 2 is a diagram showing a configuration of a conventional conveyor scale. It is a figure for demonstrating span adjustment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram illustrating a schematic configuration of a conveyor scale including a transport amount calculation device 13 according to an embodiment of the present invention.

  The conveyor scale of this embodiment continuously measures the transport amount of a transported object 5 such as powder, granule, or lump from the storage tank 4 transported by the belt conveyor 1.

  The belt conveyor 1 includes an upstream tail pulley 6, a downstream head pulley 7, an endless conveyor belt 3 spanned between the pulleys 6 and 7, and a plurality of transport carriers that support the conveyor belt 3. A take-up device 10 having a roller 8, a weight 9 for maintaining the tension of the conveyor belt 3, and a drive motor 2 that rotationally drives the conveyor belt 3 are provided.

  The conveyor scale for continuously measuring the transport amount of the transported object 5 transported by the belt conveyor 1 is provided in the middle of the conveyor transport path, and continuously detects the load of the transported object 5 passing therethrough. 11, a speed detector 12 that detects the speed of the conveyor belt 3 and outputs a pulse signal corresponding to the speed, and a load signal from the load detector 11 and a pulse signal from the speed detector 12 And a transport amount calculation device 13 for calculating the amount.

  The load detection unit 11 is arranged in the middle of the conveyor transport path, and the length of the load detection area where the load of the transported object 5 is detected on the belt conveyor 3, that is, the load of the transported object 5 in the working length (L). To detect.

  The load detection unit 11 of this embodiment includes two working length carrier rollers (weighing carrier rollers) that support the load of the transported goods 5 passing over the working length (L) by suspending the load 5 on the heel 15 via the fulcrum 14. ) 16 and 17, and the load is detected by a load cell 18 as a load detector connected to the flange 15.

  The speed detector 12 is connected to the rotating system of the head pulley 7 and outputs a pulse signal proportional to the speed of the conveyor belt 3.

  The transport amount calculation device 13 calculates the transport amount based on the pulse signal from the speed detector 12 and the load signal from the load cell 18 of the load detector 11.

  In the transport amount calculation device 13, the load signal from the load cell 18 is input via the amplifier 19 and the A / D converter 20, and the pulse signal from the speed detector 12 is input via the pulse signal switching unit 24. Are inputted to the computing unit 21, the transportation amount display unit 25 for displaying the transportation amount computed by the computing unit 21 and the integrated value thereof, the integrated value display unit 26, and the speed detected by the speed detector 12. And a speed frequency display 30 for displaying the frequency of the corresponding pulse signal. Further, the calculator 21 is given a switch output of the operation unit 35, and the belt conveyor 1 can be operated when the switch is OFF. In an emergency, the operator 36 operates the switch of the operation unit 35. Then, the belt conveyor 1 is stopped.

  In this embodiment, when the speed detector 12 that detects the speed of the conveyor belt 3 breaks down, the expected operation can be performed without performing troublesome span adjustment using a test chain as in the prior art. It is configured as follows.

  That is, the transport amount calculation device 13 outputs to the calculator 21 a pulse oscillating unit 23 that outputs a pulse signal having a variable frequency, and a pulse signal from the pulse oscillating unit 23 or a pulse signal from the speed detector 12. A pulse signal switching unit 24 for switching output, and during normal operation, the pulse switching unit 24 outputs a pulse signal from the speed detector 12 to the computing unit 21, and when the speed detector 12 fails, an operator By the operation of 36, the pulse signal from the pulse oscillating unit 23 is switched and output to the computing unit 21 instead of the pulse signal from the speed detector 12.

  The pulse oscillating unit 23 corresponds to either the speed set by the manual speed setting unit 33 given through the speed switching unit 34 or the speed average value stored in the speed average value storage unit 32. Outputs a frequency pulse signal.

  The speed average value storage unit 32 stores the speed average value of the conveyor belt 3 during normal operation calculated by the speed average value calculation unit 31, that is, the speed average value of the conveyor belt 3 based on the pulse signal of the speed detector 12. Sequentially updated and stored. By providing the speed average value updated and stored in the speed average value storage unit 32 to the pulse oscillating unit 23 via the speed switching unit 34, the pulse oscillating unit 23 detects the speed average detected by the speed detector 12. A pulse signal having a frequency corresponding to the value is output.

  Accordingly, when the speed detector 12 fails and no pulse signal can be obtained, the pulse signal from the pulse oscillating unit 23 corresponding to the speed average value updated and stored in the speed average storage unit 32 immediately before the failure is By giving the signal to the calculator 21 via the signal switching unit 24, a pulse signal having a frequency corresponding to the average speed value detected by the speed detector 12 immediately before the speed detector 12 fails is input to the calculator 21. Will be.

  In the manual speed setting unit 33 as a frequency setting unit, the operator 36 manually sets the speed of the conveyor belt 3 during normal operation, which is grasped in advance. During normal operation, the frequency of the pulse signal corresponding to the speed detected by the speed detector 12 is displayed on the speed frequency indicator 30 described above. When a failure occurs, a speed corresponding to this frequency is set by the manual speed setting unit 33.

  In this embodiment, in order to detect a failure of the speed detector 12, a speed input zero detection unit 22 is provided as an abnormality detection unit to which a pulse signal from the speed detector 12 is input. When it is detected by the speed input zero detection unit 22 that the speed detector 12 has failed and no pulse signal has been input, the computing unit 21 detects the speed input based on the output of the speed input zero detection unit 22. The buzzer 27 and the lamp 28 are driven via the zero detection oscillation unit 29 to notify the operator 36.

  In the conveyor scale having the above-described configuration, during normal operation, the load of the transported article 5 on the conveyor belt 3 passes through the working length carrier rollers 16 and 17 and the flange 15 in the working length (L) that is the load detection region. Is detected by the load cell 18 and input to the calculator 21 via the amplifier 19 and the A / D converter 20 of the transport amount calculator 13.

  On the other hand, the pulse signal from the speed detector 12 that detects the speed of the belt conveyor 3 is input to the calculator 21 via the pulse signal switching unit 24. The calculator 21 calculates the transport amount and its integrated value based on the digital signal from the A / D converter 20 and the pulse signal from the speed detector 12, and displays the transport amount indicator 25 and the integrated value indicator 26. Display each.

  If the speed detector 12 fails for some reason and no pulse signal is output, the abnormality is detected by the speed input zero detector 22, and the calculator 21 receives the output of the speed input zero detector 22. Then, the buzzer 27 and the ramp 28 are driven via the speed input zero detection oscillating unit 29 to notify the operator 36 that the speed of the conveyor belt 3 has changed.

  Upon receiving the notification, the operator 36 confirms that the transport amount or the like is not displayed on the transport amount display 25 or the like, and temporarily stops the belt conveyor 1. The reason why the belt conveyor 1 is stopped in this way is that it is necessary to confirm the supply state of the preceding apparatus, for example, in relation to the front and rear devices of the belt conveyor 1.

  Next, during a prospective operation, the operator 36 performs a switching operation of the speed switching unit 34 and the pulse signal switching unit 24, for example, the speed average value stored in the speed average value storage unit 32 via the speed switching unit 34. 23. As a result, the pulse oscillating unit 23 outputs a pulse signal having a frequency corresponding to the speed average value detected by the speed detector 12 immediately before the speed detector 12 fails, and the pulse signal is converted into a pulse signal switching unit. 24 to the computing unit 21.

  Further, as in the normal operation, the load of the transported goods 5 on the conveyor belt 3 is applied to the computing unit 21 in the working length (L) through the working length carrier rollers 16 and 17 and the flange 15. And input via the amplifier 19 and the A / D converter 20.

  The computing unit 21 computes the transport amount and its integrated value based on the digital signal from the A / D converter 20 and the pulse signal from the pulse oscillating unit 23, and displays the transport amount display unit 25 and the integrated value display unit 26. Display each. That is, the expected operation is performed using a pulse signal having a frequency corresponding to the average speed value detected by the speed detector 12 immediately before the failure in the calculator 21.

  Thus, when the speed detector 12 fails, the computing unit 21 has a frequency corresponding to the speed average value detected by the speed detector 12 immediately before the speed detector 12 is broken by the operation of the operator 36. Therefore, it is possible to start the expected operation without performing troublesome span adjustment using a test chain as in the prior art.

  Instead of the speed average value from the speed average value storage unit 32, a pulse signal having a frequency corresponding to the speed set by the manual speed setting unit 33 is output by the pulse oscillating unit 23. You may input into the calculator 21 via the part 24. FIG.

  In the above-described embodiment, the operator 36 temporarily stops the belt conveyor 1 and confirms the relation between the front and rear devices and then shifts to the expected operation. However, as another embodiment of the present invention, the belt conveyor 1 is stopped. You may make it transfer to prospective driving | operation automatically, without making it.

  In the above embodiment, the frequency of the pulse signal of the pulse oscillating unit 23 can be set by either the manual speed setting unit 33 or the speed average value storage unit 32. However, as another embodiment of the present invention, One of them may be omitted, and the frequency of the pulse signal may be set only by the other.

  The present invention is useful for conveyor scales.

DESCRIPTION OF SYMBOLS 1,50 Belt conveyor 3,53 Conveyor belt 5,51 Transported goods 11,52 Load detection part 12,54 Speed detector 13 Transport amount calculation apparatus 18 Load cell 21,55 Calculator 23 Pulse oscillation part 24 Pulse signal switching part 32 Speed Average value storage unit 33 Manual speed setting unit 34 Speed switching unit

Claims (3)

Based on the load signal from the load detection unit that detects the load of the package transported by the conveyor belt and the pulse signal from the speed detection unit that detects the speed of the conveyor belt, the transport amount of the package is calculated. A transport amount calculation device including a calculation unit for calculating,
A pulse oscillation unit that oscillates a pulse signal having a variable frequency;
Instead of the pulse signal from the speed detection unit, the switching unit that outputs the pulse signal of the pulse oscillation unit to the calculation unit, and
A speed average value calculation unit that calculates a speed average value of the conveyor belt based on a pulse signal from the speed detection unit;
A storage unit that updates and stores a speed average value of the conveyor belt calculated by the speed average value calculation unit;
A speed display unit for performing display corresponding to the detected speed of the conveyor belt;
A frequency setting unit for manually setting the oscillation frequency of the pulse signal of the pulse oscillation unit,
The oscillation frequency of the pulse signal of the pulse oscillating unit is varied based on the speed average value of the conveyor belt updated and stored in the storage unit or the setting of the frequency setting unit.
A transport amount calculation device characterized by that. An abnormality detection unit for detecting an abnormality of the speed detection unit ;
When an abnormality is detected by the abnormality detection unit, a notification unit that notifies the abnormality is provided,
The switching unit switches and outputs the pulse signal according to the presence or absence of an abnormality detected by the abnormality detection unit.
The transport amount calculation device according to claim 1. The transport amount calculation device according to claim 1, the load detection unit that detects a load of the transport object that passes through a load detection region in the middle of the transport path of the conveyor belt, and the speed of the conveyor belt The speed detection unit outputting the corresponding pulse signal,
  Conveyor scale characterized by that.

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