CN2473600Y

CN2473600Y - High speed high accuracy automatic packaging scale

Info

Publication number: CN2473600Y
Application number: CN 01237297
Authority: CN
Inventors: 顾立新
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-04-10
Filing date: 2001-04-10
Publication date: 2002-01-23
Anticipated expiration: 2011-04-10

Abstract

Provided is a high speed high accuracy automatic packaging scale comprising a scale rest, a material holding bucket, a weighing bucket and a support stage. A filling port rotary shaft which is fixedly connected with the filling port is connected with the servo motor. The servo motor is connected with the servo control part circuit. As the utility model utilizes the servo motor to replace the filling port cylinder of the material holding bucket, the time and pace for the filling port to work is ensured and the opening degree of the filling port is stable. Therefore, the problem of random distribution of weights of materials which continuously drop into the weighing bucket during the process of the cylinder closing the filling port after the small filling signals are over is solved. Thus, perfect match for the weighing speed and accuracy can be reached.

Description

The high-speed, high precision automatic packing balance

The utility model relates to automatic packing balance, is the equipment of a kind of continuous flow material weighing when flowing.

The air-cylinder type automatic packing balance generally all has storage bin hopper, scale hooper, switch board.Storage bin hopper is provided with gallery ports, and gallery ports promote the gallery ports folding by the gallery ports cylinder by the gallery ports linkage assembly; Scale hooper is provided with emptying door, and emptying door drives the emptying door folding by rotary cylinder by the emptying door linkage assembly; Scale hooper connects LOAD CELLS.Switch board comprises weighing instrument and programmable controller.Weighing instrument is connected with the LOAD CELLS circuit, and during work, programmable controller is according to monitoring that from weighing instrument and other signal of element constantly sends the action of instruction control packing scale.The air-cylinder type automatic packing balance exists long shortcoming of bigger and reinforced time of the deviation of weighing.This be because:

1, the air-cylinder type automatic packing balance utilizes the control piece of cylinder as the storage bin hopper gallery ports, and factors such as supply pressure fluctation, load variations, solenoid valve response time error, cylinder action delay all make cylinder uncertain actuation time; Because the cylinder bearing accuracy is poor, add the trueness error of gallery ports linkage assembly again, caused the variation of gallery ports apertures.The variation of the uncertain and gallery ports aperture of cylinder actuation time, after making little reinforced signal ended, cylinder closes the weight of material that continues to fall in the process of gallery ports in the scale hooper---is referred to as " free drop value " and is stochastic distribution, and free drop value just is the main factor that influences weighing precision; Though can take in actual applications to improve weighing precision by free drop value is done to revise, but modified value all is to be based upon on the preceding effective weighing results of several times, and the uncertain factor that influences free drop value is more, so have the problem of free drop value stochastic distribution, influence weighing precision.

2, in reinforced process with the opening degree of gallery ports be divided into big reinforced, in reinforced and little reinforced three stages, if the gallery ports aperture is excessive when reinforced greatly, produce overshoot, charging precision in the influence, too small as aperture, then influence charging rate.In same reinforced and little when reinforced the aperture of gallery ports all influence reinforced speed and precision.After in a single day the gallery ports linkage assembly of air-cylinder type automatic packing balance machines, its large, medium and small when reinforced the aperture of gallery ports also just determined, can only do small adjustment by adjusting the preceding nut of cylinder push-rod at the scene, differ and adapt to actual request for utilization surely, and the distribution of reinforced time can only be by changing the large, medium and small desired value change that weighing instrument is set, reinforced speed and precision do not reach optimum matching, influence weigh speed and precision.

The purpose of this utility model is to propose a kind of high speed, high-precision automatic packing balance.

The utlity model has scale frame, storage bin hopper, scale hooper, supporting station, storage bin hopper is fixed on the scale frame, storage bin hopper is provided with gallery ports, the gallery ports rotating shaft places between the diaxon bearing of fixedlying connected with the scale frame, scale hooper is connected with LOAD CELLS, the bearing of LOAD CELLS is fixed on the supporting station, scale hooper is provided with emptying door, emptying door has rotary cylinder and emptying door linkage assembly, the utility model is taked to be connected servomotor with the fixedly connected gallery ports rotating shaft of gallery ports, and servomotor is connected with servocontrol part circuit.

Can be between servomotor and gallery ports rotating shaft connection reducer.

Above-mentioned servocontrol part comprises servoamplifier and pulse producer, and servoamplifier is connected with servomotor, pulse producer circuit, and pulse producer is connected with the programmable controller circuit.

Above-mentioned servomotor adopts the HC of Mitsubishi-KFS43 type AC servo motor, servoamplifier adopts the MR-J2-40A of Mitsubishi type servoamplifier, pulse producer adopts the FX2n-1PG of Mitsubishi type pulse producer, and programmable controller adopts the FX2n-80MR of Mitsubishi type programmable controller.

The utility model substitutes the gallery ports cylinder by servomotor, there be not of the influence of the action delay of supply pressure fluctation, solenoid valve response time error, cylinder to weighing, the quick acting of servo-drive system (3000RPM), high-speed response (550HZ) and to insensitive characteristics of the variation of load can be guaranteed the time and the speed of gallery ports action.Because the accurate location (1 pulse of positioning error) of servo-drive system reaches and adopts the mode that the gallery ports door-hinge drives the gallery ports folding that directly drives, make the gallery ports aperture stable again.So free drop value only is subjected to the influence of material fluidity basically, has reduced the deviation of free drop value greatly.The utility model can be adjusted the aperture of gallery ports by adjusting the servocontrol parts at the scene according to the actual situation of weighing, and reaches the optimum matching of weighing precision and speed, not only guarantees weighing precision but also greatly improved charging rate.

Through test, the utility model is under the stable situation of material fluidity, and its free drop value is almost a steady state value, and average weighing precision improves greatly, and the packing of 25kg, error only be ± 25g, and finish once reinforced only need 3.8 seconds.

Fig. 1 is a structure schematic diagram of the present utility model;

Fig. 2 is the side view of Fig. 1;

Fig. 3 is control principle figure of the present utility model.

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 has scale frame 2, storage bin hopper 4, scale hooper 11, supporting station 21 to embodiment shown in Figure 3, and storage bin hopper 4 is fixed on the scale frame 2, and scale hooper 11 is connected with LOAD CELLS 23, and the bearing 22 of LOAD CELLS 23 is fixed on the supporting station 21; Storage bin hopper 4 is provided with gallery ports 1, and gallery ports 1 can be that welding or key are fixedlyed connected with 5 of gallery ports rotating shafts, and gallery ports rotating shaft 5 places between the diaxon bearing 3 of fixedlying connected with scale frame 2.Gallery ports rotating shaft 5 is connected with reductor 8 driven shafts by shaft coupling 6, and the main drive shaft of reductor 8 is connected with the output shaft of servomotor 9, and reductor 8 is fixedlyed connected with scale frame 2 by support 7 with servomotor 9.Servomotor 9 is connected with the servocontrol part.Scale hooper 11 is provided with emptying door 20, the structure of scale hooper emptying door and control folding thereof still adopts the structure on the present air-cylinder type automatic packing balance, be to open the door during emptying door is, respectively establish a rotary cylinder 19 and emptying door linkage assembly on the scale hooper 11 bottom biside plates 12, rotary cylinder 19 is by Pneumatic assembly control, and Pneumatic assembly is carried out the instruction of programmable controller 34.The emptying door linkage assembly has pivot arm 18, the hinged separately connecting rod 13 in pivot arm 18 two ends, the hinged separately swing arm 15 of two connecting rods 13, swing arm 15 is fixedlyed connected with each self-corresponding door-plate respectively, and pivot arm 18 is fixed on the central shaft 19-1 of rotary cylinder 19.When rotary cylinder central shaft 19-1 driven rotary arm 18 is done 90 ° rotation, two linkage assembly synchronization actions, hinged because of pivot arm 18 and connecting rod 13, and connecting rod 13 is hinged with swing arm 15, and swing arm 15 drives the door-plates action, and emptying door is opened.

The servocontrol part comprises servoamplifier 32, pulse producer 33, servoamplifier 32 is connected with servomotor 9, pulse producer 33 circuits, and pulse producer 33 is connected with programmable controller 34 circuits, weighing instrument 24 both was connected with LOAD CELLS 23 circuits, was connected with programmable controller 34 circuits again.Servo-control system is a kind of mature technology, on servomotor, servoamplifier, pulse producer and the programmable controller market supply is arranged all, can select as required, can adopt the HC of Mitsubishi-KFS43 type AC servo motor, the MR-J2-40A of Mitsubishi type servoamplifier, the FX2n-1PG of Mitsubishi type pulse producer and the FX2n-80MR of Mitsubishi type programmable controller.The program of programmable controller is worked out as requested.

When the utility model uses, detect the actual weight of material in the scale hooper by LOAD CELLS, pass the signal to the intelligent weighing instrument, instrument according to target value set and actual weight ratio, the reinforced signal of output is to the input end of programmable controller, programmable controller to reinforced signal Processing after, export corresponding servocontrol order to severo pulse generator, send signal by severo pulse generator, servoamplifier detects the absolute position of servomotor, and output control servomotor motor message is finished corresponding reinforced process.When big reinforced signal arrives, start servomotor and advance to big feed location, after the total amount in the scale hooper reaches big reinforced setting value, the validity of actual weight is differentiated in time-delay, prevent because material is on the low side to actual value of weighing that the impact of scale hooper causes, after confirming that actual weight effectively, start the servomotor opposite spin, drive gallery ports to middle feed location, reinforced process is same as above, and after little reinforced process finished, it is closed fully that motor will drive gallery ports, when the end of weighing, emptying door is opened.

Claims

1, a kind of high-speed, high precision automatic packing balance, has scale frame (2), storage bin hopper (4), scale hooper (11), supporting station (21) and switch board, storage bin hopper (4) is fixed on the scale frame (1), storage bin hopper (4) is provided with gallery ports (1), gallery ports rotating shaft (5) places between the diaxon bearing (3) of fixedlying connected with scale frame (2), scale hooper (11) is connected with LOAD CELLS (23), the bearing (22) of LOAD CELLS (23) is fixed on the supporting station (21), scale hooper (11) is provided with emptying door (20), emptying door (20) has rotary cylinder (19) and emptying door linkage assembly, it is characterized in that: the gallery ports rotating shaft (5) fixedly connected with gallery ports (1) is connected servomotor (9), and servomotor (9) is connected with servocontrol part circuit.

2, high-speed, high precision automatic packing balance according to claim 1 is characterized in that: connection reducer (8) between servomotor (9) and the gallery ports rotating shaft (5).

3, high-speed, high precision automatic packing balance according to claim 1 and 2, it is characterized in that: the servocontrol part comprises servoamplifier (32) and pulse producer (33), servoamplifier (32) is connected with servomotor (9), pulse producer (33) circuit, and pulse producer (33) is connected with programmable controller (34) circuit.

4, high-speed, high precision automatic packing balance according to claim 3, it is characterized in that: servomotor adopts the HC-KFS43 of Mitsubishi type AC servo motor, servoamplifier adopts the MR-J2-40A of Mitsubishi type servoamplifier, pulse producer adopts the FX2n-1PG of Mitsubishi type pulse producer, and programmable controller adopts the FX2n-80MR of Mitsubishi type programmable controller.