CN2347309Y

CN2347309Y - Electrical control device of motor point action

Info

Publication number: CN2347309Y
Application number: CN 98246666
Authority: CN
Inventors: 纪胜春
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-11-16
Filing date: 1998-11-16
Publication date: 1999-11-03
Anticipated expiration: 2008-11-16

Abstract

The utility model relates to an electrical control device for point action of a motor. The utility model is characterized in that a button AN is connected with a programmable controller PLC, the programmable controller PLC is connected with a controlled silicon AC switch SCRK and positive and reverse contactors C [1], C [2],... C [n-1] and C [n] of at least one group of motors, and the reverse contactors C [1], C [2],... C [n-1] and C [n] of the motors are respectively and correspondingly connected with one motor D [1], D [2],... D[n-1] and D [n]. The utility model is low in cost and can ensure that the contactor C has no any burning loss, besides, the utility model can ensure that the motor works normally to fully accord with the requirements of well head conditions; the process form power-down to another connection needs at least two seconds, the continuous point actions of an operator are limited, so the protective action on the motor is performed.

Description

The electric control gear of motor crawl work

The utility model belongs to electric control gear, particularly relates to the electric control gear of a kind of motor crawl work.

The known matching used electric control gear of well head car puller that is used for, it mainly is to be connected with forward and reverse contactor C of motor by button AN, forward and reverse contactor C of motor be connected with motor D again constitute.Because forward and reverse contactor C of motor wants often forward and reverse continuous crawl in the work of car puller, therefore cause the starting current stack, forward and reverse contactor C of motor is surpassing under the big electric current of motor rated current more than 3～4 times, frequent movement, the contact burning of its contactor C is serious.So deficiency that known electric control gear in use exists contactor C very easily to damage.For solving its deficiency, contactor C can be replaced with SCR AC switch SCRK, but every contactor C to replace two SCR AC switch SCRK, it is a lot of that this makes its cost increase again.

The purpose of this utility model is to overcome the deficiency in the known technology and provides a kind of both costs the low electric control gear by the motor crawl work that is used for the operation of multiple motors separate unit of programmable controller PLC control that does not make contactor C that any scaling loss is arranged.

The purpose of this utility model is to realize like this;

Button AN in the utility model housing connects programmable controller PLC, and programmable controller PLC connects forward and reverse contactor C of SCR AC switch SCRK and at least one group of motor ₁, C ₂... C _N-1, C _n, forward and reverse contactor C of motor ₁, C ₂... C _N-1, C _nMotor D of each corresponding connection ₁, D ₂... D _N-1, D _n

The utility model has following accompanying drawing:

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

Fig. 2 is the specific embodiment block diagram of car utility model.

Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail:

Referring to Fig. 1, in the housing (not shown), programmable controller PLC also connects forward and reverse contactor C of SCR AC switch SCRK and one group or one group above motor with when button AN is connected ₁, C ₂... C _N-1, C _n, forward and reverse contactor C of every group of motor therein ₁, C ₂... C _N-1, C _nOn all correspondence be connected with a motor D ₁, D ₂... D _N-1, D _n

Referring to Fig. 2, it is the specific embodiment that provides in the car utility model, and button AN connects programmable controller PLC, and it connects forward and reverse contactor C of SCR AC switch SCRK and two groups of motor ₁, C ₂, forward and reverse contactor C of two groups of motor ₁, C ₂Also connect motor D respectively ₁, D ₂Forward and reverse contactor C of programmable controller PLC control SCR AC switch SCRK and motor in the control loop ₁, C ₂Concrete grammar be to make forward and reverse contactor C of motor ₁, C ₂Connect prior to SCR AC switch SCRK, the back can make forward and reverse contactor C of motor like this in SCR AC switch SCRK disjunction ₁, C ₂During action, not electric current existence in the major loop.Under the initial condition, forward and reverse contactor C of SCR AC switch SCRK and motor ₁All be in open position.When the go-cart of well head car puller forward, connect the forward contactor C of programmable controller PLC control motor by button AN ₁Adhesive, this moment, may command alternating-current switch SCRK still was the disjunction state, and no current in the major loop, motor D ₁Do not change.The forward contactor C of motor ₁After 1 second of adhesive, by programmable controller PLC control SCR AC switch SCRK adhesive, there is electric current to pass through in the major loop, motor D again ₁Just change.Therefore drive the go-cart of well head car puller forward.When needing to stop, disconnect by programmable controller PLC control SCR AC switch SCRK earlier, make current interruptions in the major loop, after 1 second, the forward contactor C of motor ₁Disconnect, do not have electric current in the major loop this moment yet again.When the well head car puller was oppositely pulled a cart, button AN connected, the reverse contactor C of programmable controller PLC control motor ₁Adhesive after 1 second of adhesive, by programmable controller PLC control SCR AC switch SCRK adhesive, has electric current to pass through, motor D again in the major loop ₁Counter-rotating.Therefore driving the well head car puller oppositely pulls a cart.In like manner, motor D ₂, motor forward and reverse contactor C ₂Action all identical therewith, all course of action are controlled by programmable controller PLC.

Advantage and the good effect that the utlity model has are to use by programmable controller P LC control mixes the SCR AC switch SCRK of use and forward and reverse contactor C of motor The utility model that forms not only can guarantee that contactor C does not have any scaling loss, and can make The motor operation situation is normally moved, and meets the well head working condition requirement fully. Simultaneously because motor From outage to connecting process, minimum needs prolonged for 2 seconds again, so on certain procedures, restriction Operator's continuous inching button, played the protective effect to motor. In addition this practicality Novel cost is also lower.

Claims

1. the electric control gear of motor crawl work, mainly be by the forward and reverse contactor C that in housing, connects motor by button AN, forward and reverse contactor C of motor connects motor D again and forms, it is characterized in that: button AN connects programmable controller PLC, and programmable controller PLC connects forward and reverse contactor C of SCR AC switch SCRK and at least one group of motor ₁, C ₂... C _N-1, C _n, forward and reverse contactor C of motor ₁, C ₂... C _N-1, C _nMotor D of each corresponding connection ₁, D ₂... D _N-1, D _n