JPH0437368B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention provides a combination weigher, in particular, a plurality of supply troughs are provided around a dispersion plate for conveying and dispersing objects to be weighed, each of the supply troughs is provided with a weighing hopper, and the objects to be weighed on the dispersion plate are weighed by the supply troughs. The present invention relates to an improvement in an operation inspection device for a combination weigher that selects a plurality of weighing hoppers that are transported to a hopper and reach a set weight or a weight close to the set weight. Conventionally, the operation inspection of the above-mentioned combination scale was carried out by driving all the driving parts of the entire combination scale at the same time.
The operator inspects each drive unit. In the above-mentioned operation inspection, it was difficult to perform inspection work because all the drive parts were driven at the same time, and each drive part affected each other, making it impossible to perform accurate operation inspections. . In addition, since all operation inspections were performed by the operator, there were problems such as the inspection status changing when the operator was replaced. The present invention has been made in view of the above-mentioned conventional circumstances, and its purpose is to enable easy and accurate inspection of each drive section of a combination weigher, and to allow for self-diagnosis as the inspection status remains constant even when the operator changes. An object of the present invention is to provide an operation inspection device for a combination weigher. In the operation inspection device of the present invention, in the combination weigher, each drive unit of the dispersion plate conveyor, the supply trough conveyor, the weighing device of the weighing hopper, and the bottom cover opening/closing mechanism can be independently driven. , and a mode switching unit that switches from a normal standard mode in which these drive units are driven in combination to a maintenance mode for inspecting the operation of each drive unit, and a mode switching unit that drives each drive unit independently and individually in the maintenance mode. In addition to providing drive unit designating means, each of the drive units is provided with a sensor that detects the operating state thereof, and when the drive unit is designated and driven by the drive unit designation unit, the output of the sensor is The present invention is characterized in that it is provided with a display section that determines whether or not the operation of the drive section is normal based on the signal and displays the determination result. An embodiment of the operation inspection device of the present invention will be described with reference to the block diagram of FIG. 1. The drive unit in the combination weigher includes a main motor 1a, a dispersion feeder 1b, a weight solenoid 1c, a warning buzzer 1d, a warning lamp 1e, and a switching gate 1f. , a timing gate 1g, a supply feeder 1h, a clutch 1i, a weighing hopper 1j, etc. The main motor 1a rotates a drive shaft (not shown) that opens and closes the bottom cover of the weighing hopper 1j or a pool hopper (not shown) for transporting objects to be weighed into the weighing hopper 1j, and rotates the drive shaft (not shown) that opens and closes the bottom cover of the weighing hopper 1j or a pool hopper (not shown) for carrying objects to be weighed into the weighing hopper 1j. 4a is connected. The sensor 4a checks the rotational direction, rotational speed, rotational unevenness, etc. of the main motor 1a and inputs the information to a central processing unit 8 (hereinafter referred to as CPU) which is the core of the control system. The dispersion feeder 1b is an electromagnetic vibration feeder that drives a dispersion plate (not shown) for dispersing and transporting objects to be weighed, and is connected to a drive circuit 10b and a sensor 4b. The sensor 4b detects the vibration frequency and amplitude, which are the driving conditions of the dispersion feeder 1b, and transmits this detection signal.
This is input to the CPU 8, and the CPU 8 checks whether the driving conditions are optimal conditions based on this detection signal. The weight solenoid 1c is a solenoid for loading a reference weight for span adjustment of the weighing hopper 1j, and is connected to the drive circuit 10c and the sensor 4.
By connecting c. The sensor 4c checks whether the reference weight is correctly loaded on each weighing hopper 1j and inputs the result to the CPU 8. A warning buzzer 1d and a warning lamp 1e are used to visually or audibly notify the operator of an abnormality or failure of the combination scale, and are connected to drive circuits 10a and 10e, respectively.
and sensors 4d and 4e are connected. The sensors 4d and 4e each check whether the warning buzzer 1d sounds normally and whether the warning lamp 1e lights up normally, and inputs the results to the CPU 8. The switching gate 1f and the timing gate 1g are
The switching gate 1f is a directional valve that is provided in a collection hopper that collects objects to be weighed selected as a combination, and determines which of a plurality of transport paths the collected objects to be weighed are to be carried out. It is installed at the roadside and opens to temporarily store objects to be weighed and to carry out the objects at a predetermined timing, and is connected to drive circuits 10f, 10g and sensors 4f, 4g. The sensor 4f checks whether the switching gate 1f switches as it has switched.
g is used to check whether the timing gate 1g opens at a predetermined timing, and any detection signal is input to the CPU 8. The supply feeder 1h is connected to the metering hopper 1 from the distribution plate.
This is an electromagnetic vibration feeder that drives a supply trough that transports objects to be weighed to j, and is connected to a sensor 4h. The sensor 4h detects the driving conditions of the supply feeder 1h, such as the frequency, amplitude, and vibration time, and inputs this detection signal to the CPU 8. Based on this detection signal, the CPU 8 determines whether the driving conditions are optimal. Check for presence. The clutch 1i connects and separates the drive shaft rotated by the main motor 1a and the bottom cover opening/closing mechanism of the weighing hopper 1j, and discharges the object to be weighed in the weighing hopper 1j of a set weight or a combination close to the set weight. , by connecting the sensor 4i. The sensor 4i checks whether the clutch 1i is reliably moving toward and away from the clutch 1i, or whether the weighing hopper 1j
This checks the opening/closing movement of the bottom cover and inputs it to the CPU 8. The weighing hopper 1j weighs the object to be weighed transferred into the weighing hopper 1j, and the CPU outputs the detection signal when there is no load and the detection signal when the reference weight is loaded.
8 and performs a zero point check and span check. In the weighing hopper 1j, the CPU 8 is the actual sensor, and it checks whether the detection signal when there is no load matches the set zero point, and also checks the difference between the detection signal when the reference weight is loaded and the detection signal when there is no load. Compare with the set span and check if they match. If they do not match, adjust automatically or manually. In the diagram, bucket conveyor 6k and stock trough 6
1 is a drive unit of a supply device that supplies the objects to be weighed to the combination scale; the stock trough 6l is for conveying the objects to be weighed to the bucket of the bucket conveyor 6k; The weighing device conveys the weighed object to the dispersion plate of the combination weigher, and is connected to drive circuits 11k and 11l and sensors 7k and 7l. Sensors 7k and 7l are connected to bucket conveyor 6 respectively.
Detecting the operating status of k and stock trough 6l,
This detection signal is input to CPU8.
8 checks whether the operating condition is the optimum condition based on this detection signal. The CPU 8 controls the drive units 1a to 1j and the supply device drive units 6k and 6l, and starts each of the drive circuits 10a to 10g, 11k and 11l, as well as each sensor 4a to 4i, 7k and 7l and the metering hopper 1j. It detects the signal of The CPU 8 includes a mode switching section 2, an operation section 3,
The display section 5 and storage section 9 are connected. The mode switching unit 2 is for individually driving the driving units 1a to 1j, etc., and is for switching to multiple stages such as standard mode, setting mode, and maintenance mode. It is used to input various data,
The function changes depending on the mode setting of the mode switching section 2. In the standard mode, normal combination work is performed, and the start and stop of the operation are instructed using keys 3a and 3b, and the discharge of all objects to be weighed at the end of the work is performed using the discharge key 3.
Instruct at h. Setting modes include number of combinations, combination weight, tolerance,
This is for setting the code, time, etc. Issue number key 3
c, weight key 3d, tolerance key 3e, code key 3f, time key 3j, etc., and then input each setting value. Maintenance mode is a mode for checking the operation of each part, and each drive part 1a to 1j, 6k, 6l
When the code key 3f is pressed after inputting a number on the numeric keypad (for example, main motor 1a is the main motor 1a, dispersion feeder 1b is the main motor 1b), the location to be driven is specified.
Next, when the test key 3i is pressed, the specified location is driven, and the process is ended when the end key 3g is pressed. The display section 5 displays actual values, set values, and detected values in each of the above modes, and the measurement frequency display section 5
a, a set weight display section 5b, a tolerance display section 5c, an error display section 5d, a code display section 5e, and a weighing hopper number display section 5f. The operation check of the above embodiment will be explained with reference to FIGS. 2 to 15. FIG. 2 is a flowchart showing the main program, and FIGS.
FIG. 7 is a flowchart of a subprogram showing steps 7 to 39; When starting the operation check 20, first the display section 5
It is checked whether each part 5a to 5f is operating normally (21), whether the check is stopped by pressing the stop key 3b (22), and after completion of the check (23), it is checked (24) whether each of the weighing hopper number display parts 5f lights up. Next, check whether the numeric keypad 3k, code key 3f, etc. can be input normally.
If there is a failure, wait 42 for the next key operation, and if there is no abnormality, proceed to the next check operation. Main motor check 27, distributed feeder check 28, weight solenoid check 29, warning buzzer check 30, warning lamp check 31, switching gate check 32, timing gate check 3
3. Bucket conveyor check 34, stock tray check 35, feeder check 36, clutch check 37, feeder clutch check 3
8. Perform weighing hopper punch 39 in sequence. Each of the above checks 27 to 39 performs the operations shown in FIGS. 3 to 15. For example, if the main motor check 27 is explained with reference to FIG. 3, if the main motor is not checked, the next check is performed. , drive the main motor and sensor 4
If there is no abnormality, the next check is performed, and if there is an abnormality, error 0 is displayed on the set weight display section 5b. Note that this display may be displayed on a dedicated error display unit provided. The other checks are also almost the same as shown in the figure, and their explanation will be omitted. An example of the key operations, check drive unit, and error display in the above-mentioned check steps 27 to 39 will be described below.

【table】 39

Claims (1)

[Claims] 1. A plurality of supply troughs are provided around the distribution plate that conveys and disperses the object to be weighed, each of the supply troughs is provided with a weighing hopper equipped with a bottom cover opening/closing mechanism, and the object to be weighed on the distribution plate is weighed by the supply trough. In a combination weigher that automatically performs a series of steps of conveying the object to a hopper, selecting a plurality of weighing hoppers that reach a set weight or a weight close to the set weight, and discharging the selected object to be weighed, the dispersion plate conveyor , the conveyor of the supply trough, and the bottom cover opening/closing mechanism of the weighing hopper, each drive unit can be driven independently, and the operation of each drive unit is inspected from the normal standard mode in which these drive units are driven in combination. a mode switching section for switching to a maintenance mode for the purpose of maintenance, and a drive section specifying means for independently and individually specifying the drive of each drive section in the maintenance mode;
Each of the drive sections is provided with a sensor that detects the operating state thereof, and when the drive section is designated and driven by the drive section specifying means, the operation of the drive section is determined to be normal based on the output signal of the sensor. 1. An operation inspection device characterized by comprising a display section for determining whether or not the above conditions are met and for displaying the determination result.