CN201038739Y

CN201038739Y - Motor overload protecting controller

Info

Publication number: CN201038739Y
Application number: CNU2007200796596U
Authority: CN
Inventors: 王云清; 万海平; 潘文建
Original assignee: SICHUAN QINGCHENG MACHINE CO Ltd
Current assignee: SICHUAN QINGCHENG MACHINE CO Ltd
Priority date: 2007-05-24
Filing date: 2007-05-24
Publication date: 2008-03-19
Anticipated expiration: 2017-05-24

Abstract

The utility model discloses a motor overload protection controller, belonging to the technical filed of overload protector. The utility model comprises a saw shaft motor and a material feeding motor. The material feeding motor is connected in series with a material feeding frequency converter, wherein, the material feeding frequency converter is respectively connected with a constant speed potentiometer and a slow speed potentiometer through a relay. The control signal input end of the material feeding frequency converter is respectively connected with a feedback voltage output loop which is provided with a digital current meter and a relay secondary loop. The relay 2 is connected with the two ends of a control power supply after being connected with a switch 2 in series, while the relay 1 is connected with the two ends of the control power supply after being connected with a switch 1 in series. The two ends of the power supply are also connected with the digital current meter in parallel. The utility model has the advantages of effectively providing the saw shaft motor with overload protection, and automatically adjusting the material feeding speed of the material feeding motor according to the current flow of the saw shaft motor when in material feeding, without influencing the normal operation of the tool. The utility model is in particular suitable to be used as overload protection of the saw shaft motor of automatic multi-saw blade longitudinal sawing machine.

Description

Motor overload protection controller

Technical field

The utility model relates to overload protection arrangement, especially a kind of overload protective controller of motor.

Background technology

Multiple blade saw is in operation, and when running into timber rhabdion or thickness of cutting suddenly and situation such as undergo mutation, saw material motor can serious overload, so that damages saw blade or main shaft even burn motor,, production caused have a strong impact on.

Summary of the invention

At deficiency of the prior art, the purpose of this utility model is: provide a kind of when excess load, can reduce feeding speed automatically, and the mandrel motor do not shut down, and after spindle motor load for sawing reduces, the motor overload protection controller that feeding speed increases automatically.

The technical solution of the utility model is: a kind of motor overload protection controller, comprise mandrel motor and feeding motor in parallel, on the feeding motor, be serially connected with the feeding frequency converter, wherein, the feeding frequency converter connects normal fast potentiometer and potentiometer at a slow speed respectively by relay one, and signal input end of feeding frequency converter is connected with the feedback voltage output loop and the relay secondary circuit of digital ammeter respectively; Relay two serial connection switches two and connection control both ends of power, relay one serial connection switch one back connects controls both ends of power, and this both ends of power also is parallel with digital ammeter.

The beneficial effects of the utility model are: overload protection is provided can be effectively for the mandrel motor, slow down automatically and do not shut down, do not influence the operate as normal of lathe simultaneously again.

The utility model is described in further detail below in conjunction with drawings and Examples.

Description of drawings

Fig. 1 is the utility model main circuit structure schematic diagram;

Fig. 2 is the structural representation of the utility model control section circuit.

Embodiment

Preferred embodiment

As shown in Figure 1 and Figure 2, a kind of motor overload protection controller, comprise mandrel motor M 1 and feeding motor M 2 in parallel, on feeding motor M 2, be serially connected with feeding frequency converter A TV, wherein, feeding frequency converter A TV connects normal fast potentiometer VR1 and potentiometer VR2 at a slow speed respectively by relay one KA1, and charging rate is given by potentiometer VR1, and the general adopted value of VR2 is about the 1/2VR1 value; Signal input end of feeding frequency converter A TV is connected with the feedback voltage output OUTPUT loop and the relay two KA2 loops of digital current Table A respectively; Relay two KA2 are connected in series switch two S2 and are connected in the 220V both ends of power, connect the 220V both ends of power behind switch one S1 serial connection relay one KA1, and this both ends of power also is parallel with the digital current Table A.What ammeter A adopted is little processing type alternating current ammeter, except that the electric current that shows mandrel motor M 1, operating current value that can also configuration switch one S1, the operating current value of switch two S2, and the mandrel electric current upper lower limit value of feedback voltage output OUTPUT value of feedback correspondence.

The operation principle of present embodiment is as follows:

During operate as normal, after startup mandrel motor M 1 and the feeding motor M 2, ammeter A monitoring mandrel motor M 1 electric current; When measured value reaches the mandrel lower current limit value of feedback voltage output OUTPUT feedback beginning, ammeter begins to occur feedback voltage, the voltage given with potentiometer VR1 subtracts each other, the given voltage of frequency converter is reduced, thereby the output frequency of frequency converter and output voltage are reduced, and feeding speed descends gradually, if the electric current of the mandrel motor that monitors is bigger, then feedback voltage accordingly also can be more greatly, and feeding speed will fall more.

After feeding speed descended gradually, if the mandrel electric current has also lowered, when being lower than the mandrel lower current limit value of OUTPUT feedback beginning, value of feedback was 0, thereby recovers original VR1 setting speed.

After feeding speed descended gradually, if the mandrel electric current still up increases, when being increased to S1 operating current value, relay K A1 started working, and the velocity setting with frequency converter switches to potentiometer VR2 by force, made the output of frequency converter be reduced to a half value of normal speed.

If the mandrel electric current has reached the operating current value of S2, mean that mandrel seriously transships, thereby cut off feeding, conscientiously protected machine owing to the action of S2 this moment.

Claims

1. a motor overload is protected controller, comprise mandrel motor (M1) and feeding motor (M2) in parallel, it is characterized in that: on feeding motor (M2), be serially connected with feeding frequency converter (ATV), wherein, feeding frequency converter (ATV) connects normal fast potentiometer (VR1) and potentiometer (VR2) at a slow speed respectively by relay one (KA1), and signal input end of feeding frequency converter (ATV) is connected with feedback voltage output (OUTPUT) loop and the relay secondary circuit of digital ammeter (A) respectively; Relay two (KA2) serial connection switch two (S2) and connection control both ends of power, relay one (KA1) serial connection switch one (S1) back connects controls both ends of power, and this both ends of power also is parallel with digital ammeter (A).