CN201732017U

CN201732017U - Automatic controller for grain sampler

Info

Publication number: CN201732017U
Application number: CN2010201238724U
Authority: CN
Inventors: 邱广阔; 安西友; 陈国强; 苏树胜; 韩珏
Original assignee: STATE GRAIN RESERVES LIAOCHENG DEPOT
Current assignee: STATE GRAIN RESERVES LIAOCHENG DEPOT
Priority date: 2010-03-05
Filing date: 2010-03-05
Publication date: 2011-02-02
Anticipated expiration: 2020-03-05

Abstract

The utility model discloses an automatic controller for a grain sampler and relates to automatic control technology of the grain sampler. The automatic controller is used for controlling a motor connected with a sampling pipe to rotate positively and negatively and comprises a control circuit module electrically connected with the motor through a transfer switch, wherein the control circuit module is provided with a counter and a timer; the counter is connected with the timer, an analog-to-digital converter and an current transmitter; the other end of the current transmitter is connected with the phase line of the motor; and a limit switch capable of controlling the rising height of the sampling pipe is arranged between the transfer switch and the motor. The automatic controller has the advantages of realizing automatic downward insertion of the sampling pipe of the grain sampler and automatic stop and automatic return functions when meeting a hard object or the tank bottom of a vehicle or ship, enhancing the grain sampling representative of the sampler, lightening the labor intensity of workers and enhancing the automatic degree of the grain sampler.

Description

Grain sample machine self-actuated controller

Technical field

The utility model relates to a kind of automatic control technology of grain sample machine, specifically a kind of grain sample machine self-actuated controller.

Background technology

Grain sample machine is a kind ofly get grain and pile the take a sample equipment of selective examination grain heap grain quality of the mode of each layer grain by inserting, and progressively adopts electrical control in the practical application, and automaticity progressively improves, and is a kind of robotization electric tool of grain sample thief.

Existing electronic grain sample machine mechanical realization mainly comprises: be fixed on base on ground or the hull, be installed in column on the base, with the column activity can around the crossbeam of column rotation and be installed on the crossbeam can stretching motion piece-like tube.Insert and rise down by what the stretching motion of piece-like tube can be realized piece-like tube, finish the sampling work of grain being piled each layer grain.

Mainly contain two actions under the piece-like tube in the process of slotting skewer sample thief: the decline of piece-like tube, and the stopping and returning of piece-like tube at the bottom of touch hard object or the car and boat case time, mostly these are manually operated.In this course of work, be mostly that operating personnel rule of thumb control down the degree of depth of inserting, because slotting situation is invisible down, often causes owing to touch piece-like tube bending or the body frame that the bottom causes and rock, even danger, poor effect occur.For fear of the generation of above-mentioned phenomenon, operating personnel control piece-like tube and do not try one's best and be inserted into grain layer bottom during work, and the representativeness of skewer sample thief is had a greatly reduced quality.

The utility model content

The purpose of this utility model is to provide a kind of grain sample machine self-actuated controller, can realize automatically down inserting of grain sample machine piece-like tube, and stopping automatically and return automatically at the bottom of touch hard object or the car and boat case time.

The technical scheme in the invention for solving the technical problem is: this kind grain sample machine self-actuated controller, be used to control the rotating of the motor that is connected with piece-like tube, relate to piece-like tube and motor, it is characterized in that, comprise the control circuit module that is electrically connected with motor by change-over switch; Control circuit module is provided with counter and timer, and described counter is connection timer, A/D converter, current transducer successively, and the described current transducer other end connects the phase line of motor; Described current transducer is used for gathering the variation of motor phase line current values, and the alternating current in the circuit is measured in real time, and it is transformed to the DC current output of standard; The digital signal that the dc current signal of described standard obtains through A/D converter, timer are used for time-delay, judge whether to be once complete current break by delay time is set, and prevent the generation of misoperation; Described counter is used for adding up of digital signal, sends control circuit module to as a digital command after adding up by the signal with twice current break and carries out logic determines.Simultaneously control circuit module also is electrically connected with motor by change-over switch, makes that the command instruction of control circuit module can control its switch, and then controls the rotation direction of motor.

Set up the limit switch that to control the piece-like tube lifting height between described change-over switch and the motor.

Described limit switch is a Photoelectric infrared switch.

Described control circuit module is a single-chip microcomputer.

The beneficial effects of the utility model are: the utility model has been realized automatically down inserting of grain sample machine piece-like tube, and the function that stops automatically He return automatically at the bottom of touch hard object or the car and boat case time, has strengthened the representativeness that sample machine skewer is got grain samples.Alleviate working strength of workers, improved the automaticity of grain sample machine.

Description of drawings

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

Fig. 2 is a workflow diagram of the present utility model;

Embodiment

As shown in Figure 1 and Figure 2, this grain sample machine self-actuated controller is used to control the rotating of the motor of piece-like tube, comprises control circuit module, counter, timer, A/D converter and current transducer.This control circuit module preferentially adopts single-chip microcomputer; Counter has the function that signal adds up, and is totalizer again; Timer has the function of time-delay, is chronotron again; Current transducer is used for detecting the variation of motor phase line electric current, claims current sensor again, preferentially adopts Alternating Current Power Supply type AC current sensor.

Counter and timer are arranged on the control circuit module, and described counter is connection timer, A/D converter, current transducer successively.Current transducer also is connected with the phase line of motor simultaneously, is used for gathering the variation of motor phase line current values, and the alternating current in the circuit is measured in real time, and it is transformed to the DC current output of standard; The dc current signal of standard obtains digital signal through A/D converter, and timer is used for time-delay, judges whether to be once complete current break by delay time is set, and prevents the generation of misoperation; Counter is used for adding up of digital signal, sends control circuit module to as a digital command after adding up by the signal with twice current break and carries out logic determines.Simultaneously control circuit module also is electrically connected with motor by change-over switch, makes that the command instruction of control circuit module can control its switch, and then controls the rotation direction of motor; In control circuit module, also be provided with the hand switch button, be used for manual control.

The quick-witted energy of grain sample controller principle of work: sample machine piece-like tube can produce the primary current sudden change when starting in sampling process, runs into hard thing or lower position switch and can produce primary current sudden change, twice totally current break again.The utility model mainly with the second time current break be the action of control signal control piece-like tube motor.Gather the variation of current values in the motor phase line and be converted to the dc current signal of standard by current transducer, A/D converter, secondary current sudden change is converted to stopping of command instruction control piece-like tube and rises by counting, timing and control circuit, rise to correct position and stop automatically and automatically reset.

This circuit motor adopts three-phase alternating current, and operating process is: at first, press shift knob, produce current break for the first time, the motor that drives piece-like tube work just changes, and piece-like tube descends; At the bottom of piece-like tube runs into car and boat or during touch hard object, the motor of control piece-like tube operation is obstructed, and the electric current in the circuit produces telomutation, control circuit module identification and control its switch action.Change-over switch is the solenoid of the contactor of the normally closed node of the contactor that just changeing of the controlling and driving motor that is cascaded and the counter-rotating of controlling and driving motor, forms interlock; Control the A.C. contactor of motor counter-rotating this moment and connect, the motor counter-rotating, piece-like tube rises; When piece-like tube rises to predetermined height, when piece-like tube breaks away from the Photoelectric infrared switch monitored area constantly, the limit switch automatic shutoff circuit, machine operation stops, and each switching value of circuit resets.

Except that the described technical characterictic of instructions, be the known technology of those skilled in the art.

Claims

1. a grain sample machine self-actuated controller is characterized in that, comprises the control circuit module that is electrically connected with motor by change-over switch; Control circuit module is provided with counter and timer, and described counter is connection timer, A/D converter, current transducer successively, and the described current transducer other end connects the phase line of motor.

2. grain sample machine self-actuated controller according to claim 1 is characterized in that, sets up the limit switch that can control the piece-like tube lifting height between described change-over switch and the motor.

3. grain sample machine self-actuated controller according to claim 2 is characterized in that described limit switch is a Photoelectric infrared switch.

4. grain sample machine self-actuated controller according to claim 1 and 2 is characterized in that described control circuit module is a single-chip microcomputer.