CN2269952Y

CN2269952Y - Plastic film heat sealing machine

Info

Publication number: CN2269952Y
Application number: CN 96215915
Authority: CN
Inventors: 廖裕强
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-07-19
Filing date: 1996-07-19
Publication date: 1997-12-10
Anticipated expiration: 2006-07-19

Abstract

The utility model discloses a plastic film heat sealing machine which is composed of a heat sealing machine body, and a control circuit, a bidirectional controlled silicon and a heating wire which are arranged in the heat sealing machine body, wherein, the control circuit comprises a delay switch circuit and a controlled silicon trigger circuit; the bidirectional controlled silicon and the heating wire are connected to an alternating-current power circuit in series, the voltage of an alternating-current power supply outputs and provides a direct-current power supply of the control circuit through a rectification bridge, the output end of a delay switch is connected with the control end of the controlled silicon trigger circuit, and the output end of the controlled silicon trigger circuit is connected with the triggering end of the bidirectional controlled silicon. The utility model has the advantages of power saving, extensive operating range and strong applicability.

Description

The plastic sheeting heat-sealing machine

The utility model belongs to electric type, relates in particular to a kind of plastic sheeting heat-sealing machine.

The present heat-sealing machine that uses on the market, major part is with the 220V AC power, by transformation or automatic coupling voltage regulator, reducing to 40V left and right sides low pressure compresses plastic foil by heating wire and comes heat seal, the heat-sealing machine shortcoming of this form is limited by transformer, power attenuation is big, fuel factor is slow, heat seal is insecure, does not have way processing for the big diaphragm of thickness.

The purpose of this utility model provides a kind of high efficiency, plastic sheeting heat-sealing machine that applicability is strong.

For achieving the above object, the utility model has adopted following technical scheme: a kind of plastic sheeting heat-sealing machine, form by heat-sealing machine body and built-in control circuit, bidirectional triode thyristor, heater strip, described control circuit comprises delay switch circuit and thyristor gating circuit, bidirectional triode thyristor and heater strip series connection are in AC power circuit, AC supply voltage provides the dc source of control circuit by rectifier bridge output, the output of delay switch connects the control end of thyristor gating circuit, and the output of thyristor gating circuit connects the The Trigger of Bidirectional Triode Thyristor end.

The utility model is described in further detail below in conjunction with accompanying drawing

Fig. 1 is the utility model circuit working principle schematic

As shown in Figure 1: bidirectional triode thyristor KZ ₁Be connected in series with heater strip JRS1 and be connected in the AC power circuit, AC power is by rectifier bridge, low tension switch K ₁Output provides the dc source of control circuit, and delay switch is by rc-delay circuit (resistance R ₁, R ₆, variable resistor R ₂, charging capacitor C ₁Form) and a transistor Q ₁Form the output (R of rc-delay circuit ₆An end) meet transistor Q ₁Base stage b ₁End, thyristor gating circuit is by rc-delay circuit (resistance R ₃. variable resistor R ₄, capacitor C ₂Form) and single-node transistor Q ₂Constitute the control utmost point b2 of the output order junction transistors of this rc-delay circuit, transistor Q ₁Colelctor electrode output through a backward dioded D ₁Order junction transistors Q ₂Control utmost point b ₂, the output of The whole control circuit (a, b end) connects the The Trigger of Bidirectional Triode Thyristor end.

Its operation principle is: after the energising of 220V power supply, start working, put by the plastic foil of heat seal, heated filament presses, low tension switch K ₁Connect, circuit working is because capacitor C ₁There is Q ₁Be in and end, Q ₂Produce sawtooth waveforms, the conducting controllable silicon because control controllable silicon phase shifting angle changes the output AC voltage virtual value, is added on the heating wire after the 220V voltage step-down, produces heat plastic film is heated, and works as capacitor C ₁After being full of electricity, Q ₁Base voltage rises, conducting state, Q ₂End, controllable silicon is in shutoff thereupon, and heated filament does not have electric current to pass through, and finishes heat seal work.Change variable resistor R ₂Resistance can be regulated working time of delay switch, sets delay time with the control degree of heat according to the length of the thin and thick of plastic sheeting, required heat time heating time.To thicker plastic foil, also can hotly get very firm like this.Change variable resistor R ₄Can regulate the phase shifting angle of thyristor gating circuit, thereby the size of control operating voltage virtual value can be regulated heating voltage 0-200V, thereby improved working range greatly.

The technical program is owing to adopt advanced electronic component, utilize controllable silicon buck functionality replacement transformer in the past, thereby can economize on electricity energy more than 40 percent, and pass through control adjustable settings working time, the heating intensity of control circuit, thereby working range is wide, applicability is strong.

Claims

1, a kind of plastic sheeting heat-sealing machine, form by heat-sealing machine body and built-in control circuit, bidirectional triode thyristor, heater strip, it is characterized in that: described control circuit comprises delay switch circuit and thyristor gating circuit, bidirectional triode thyristor and heater strip series connection are in AC power circuit, AC supply voltage provides the dc source of control circuit by rectifier bridge output, the output of delay switch connects the control end of thyristor gating circuit, and the output of thyristor gating circuit connects the The Trigger of Bidirectional Triode Thyristor end.

2, plastic sheeting heat-sealing machine according to claim 1 is characterized in that: described delay switch is made up of a rc-delay circuit and a transistor, and the output of rc-delay circuit connects transistorized base stage; Thyristor gating circuit is made of rc-delay circuit and single-node transistor, the control utmost point of the output order junction transistors of this rc-delay circuit; Transistorized colelctor electrode output is through the control utmost point of a backward dioded order junction transistors.