CN201777844U

CN201777844U - Restarting-prevention protection circuit of forklift engine

Info

Publication number: CN201777844U
Application number: CN2010205167431U
Authority: CN
Inventors: 郑宝
Original assignee: Hunan Sunward Intelligent Machinery Co Ltd
Current assignee: Hunan Sunward Intelligent Machinery Co Ltd
Priority date: 2010-09-03
Filing date: 2010-09-03
Publication date: 2011-03-30
Anticipated expiration: 2020-09-03

Abstract

The utility model discloses a restarting-prevention protection circuit of a forklift engine. A first terminal of a coil of a first relay receives voltage signals output by a generator, a second terminal of the coil of the first relay and a normally-disconnected contact of the first relay are both grounded, and a power supply terminal of the first relay is connected with the second terminal of the coil of a second relay; the first terminal of the coil of the second relay is connected with a power supply, the power supply terminal of the second relay is connected with the power supply through a starting terminal of a key switch, and the normally-connected contact of the second relay is connected with the first terminal of the coil of a third relay; and the second terminal of the coil of the third relay is grounded, the power supply terminal of the third relay is connected with the power supply, and a normally-disconnected contact of the third relay is connected with the coil of a starter. The restarting-prevention protection circuit of the forklift engine can effectively prevent the repeated starting of the forklift engine so as to avoid the damage to the forklift starter.

Description

The anti-protective circuit of restarting of a kind of forklift engine

Technical field

The utility model technology relates to the anti-protective circuit of restarting of a kind of forklift engine.

Technical background

Forklift engine is when starting, the dependence starter motor drives the gear ring on the forklift engine flywheel, make forklift engine startup back and carry out normal operation, but after the forklift engine normal operation, do not allow starter motor to rotate again, if starter motor rotates in the time of the forklift engine normal operation, because the gear ring on the forklift engine flywheel is done initiatively rotation, starter motor is also done initiatively rotation, and they all have separately independently rotating speed, if at this moment they mesh running, more weak relatively starter motor is damaged, in order to prevent the appearance of this situation, general what adopt is to be provided with to prevent the mechanical mechanism restarted on starting switch, can not then restart after promptly starting once, if just can carry out after startup must be closed switch once more, this kind physical construction is not easy to control, complicated operation, wasting space.

The utility model content

The purpose of this utility model is to propose the anti-protective circuit of restarting of a kind of forklift engine, and this forklift engine prevents that restarting protective circuit can effectively prevent the forklift engine repeated priming, avoids the fork truck starter motor is caused damage.

Technical solution of the present utility model is as follows:

The anti-protective circuit of restarting of a kind of forklift engine, the first terminal sending and receiving motor output voltage signal of the coil of first relay, the equal ground connection of normally open contact of second terminal of the coil of first relay and first relay, second terminal of the coil of the terminals for power supplies of first relay and second relay joins;

The first terminal power connection of the coil of second relay, the terminals for power supplies of second relay joins by the startup terminal and the power supply of key switch, and the first terminal of the normal open contact of second relay and the coil of the 3rd relay joins;

The second terminal ground connection of the coil of the 3rd relay, the terminals for power supplies power connection of the 3rd relay, the normally open contact of the 3rd relay connects the starter motor coil.

Described first relay and second relay are the relay of JD1912 model, and the 3rd relay is the starting relay of JQ103A model.

Beneficial effect:

The utility model has only adopted cooperatively interacting of three relays and key switch to realize protection to starter motor, and is simple in structure, and is easy to realize stable performance, good reliability.

Description of drawings

Fig. 1 restarts the protective circuit schematic diagram for forklift engine.

JD1, JD2, JD3 are three relays, and JK is a key switch.

The specific embodiment

Below with reference to figure and specific implementation process the utility model is described in further details.

Embodiment 1:

As shown in Figure 1, the anti-protective circuit of restarting of a kind of forklift engine, the first terminal of the coil of the first relay J D1 (being the terminal 1 of JD1) sending and receiving motor output voltage signal, second terminal of the coil of the first relay J D1 (being the terminal 2 of JD1) and the equal ground connection of the normally open contact (being the terminal 4 of JD1) of the first relay J D1, the terminals for power supplies of the first relay J D1 (being the terminal 3 of JD1) joins with second terminal of the coil of the second relay J D2;

The first terminal power connection of the coil of the second relay J D2, the terminals for power supplies of the second relay J D2 joins by the startup terminal and the power supply of key switch, and the first terminal of the coil of the normal open contact of the second relay J D2 (being the terminal 5 of JD2) and the 3rd relay J D3 joins;

The second terminal ground connection of the coil of the 3rd relay J D3, the terminals for power supplies power connection of the 3rd relay J D3, the normally open contact of the 3rd relay J D3 connects the starter motor coil.

Principle of work is as follows:

Action when 1, forklift engine starts:

In the time of will starting key and be threaded to enable position, startup terminal C on the key and terminals for power supplies B connect, starting terminal C is communicated with by lead with the terminals for power supplies of the second relay J D2, electric current arrives first terminal of the control coil of the 3rd relay J D3 by the normal open contact of the second relay J D2 thus, second terminal ground connection of the control coil of the 3rd relay J D3, the coil electricity adhesive of the 3rd relay J D3 at this moment, the 3rd relay J D3 normally open contact and power connection then, because the 3rd relay J D3 normally open contact is wired on the starter motor silk covered wire circle, at this moment starter motor silk covered wire circle gets, promote miniature gears and the engagement of forklift engine flywheel crown gear in the starter motor, circuit is by big electric current, the starter motor rotation starts forklift engine.

2, the action after forklift engine starts:

Forklift engine relies on self power running after starting, the alternating current generator entry into service that drives by belt at this moment, and begin generating.The voltage signal of alternating current generator generation at this moment arrives the first relay J D1 control coil and constitutes the loop with grounding jumper by lead, and the first relay J D1 coil adhesive is connected and ground connection the terminals for power supplies of the first relay J D1 and normal off terminal.At this moment, second terminal of the coil of the second relay J D2 is connected with ground by the normally open contact of the first relay J D1, constitute loop and adhesive, thereby make the normal open contact open of the second relay J D2, at this moment the coil blackout of the 3rd relay J D3, thereby make the outage of the 3rd relay J D3 terminals for power supplies, the starter motor coil can't get electric by the 3rd relay J D3, and then starter motor quits work under the effect of electrical generator and locks out-of-run state.Even this mistiming goes to the startup P PARK Position P with ignition lock, the 3rd relay J D3 can not move yet, so the power circuit of starter motor just can not connect, thereby has prevented the bump of starter motor miniature gears and flywheel crown gear, and starter motor has been played automatic protective effect.

Claims

1. a forklift engine is prevented restarting protective circuit, it is characterized in that,

The first terminal sending and receiving motor output voltage signal of the coil of first relay, the equal ground connection of normally open contact of second terminal of the coil of first relay and first relay, second terminal of the coil of the terminals for power supplies of first relay and second relay joins;

2. forklift engine according to claim 1 is anti-restarts protective circuit, it is characterized in that described first relay and second relay are the relay of JD1912 model, and the 3rd relay is the starting relay of JQ103A model.