CN202001165U

CN202001165U - Protection system for preventing starting engine by mistake

Info

Publication number: CN202001165U
Application number: CN 201020158374
Authority: CN
Inventors: 李月丽; 曹建峰
Original assignee: Tianjin Construction Machinery Factory
Current assignee: Tianjin Construction Machinery Factory
Priority date: 2010-04-14
Filing date: 2010-04-14
Publication date: 2011-10-05
Anticipated expiration: 2020-04-14

Abstract

The utility model belongs to a protection system for preventing starting an engine by mistake, which is specially used for engineering machinery. The protection system for preventing starting the engine by mistake comprises a starter and a generator of the engine, a starting relay, a safety relay, a starting switch and a limit switch. The beneficial effect of the utility model is that when the engine is in a normal running process, even though a shift control lever is in neutral gear and the starting switch is pulled to a starting shift, a starting coil of the starter is not working, a starting gear is not engaged again with a flywheel of the engine and collision of the starting gear is avoided. Therefore, the engine is protected for normal working and accidents are prevented.

Description

Prevent to start the chance error opposed-voltage protective system

Technical field

The utility model belongs to engineering machinery field, relates in particular to the protective system of mistake starting in the engine operation process.

Background technique

The motor of engineering machinery is in normal operation at present, the engineering machinery shift is under neutral state, when the driver pulls start gear to switch starter, the starter coil of motor can get electric adhesive, the shift fork of starter motor drives clutch and moves behind armature shaft, the flywheel of starting gear and motor is meshed once more, thereby the starter motor starting gear can be beaten tooth and causes the motor can't proper functioning like this.

Summary of the invention

The purpose of this utility model is to overcome the deficiency of above-mentioned technology, and mistake opposed-voltage protective system in a kind of engineering machinery special engine running is provided, and it can effectively solve the problem that the starter motor starting gear can be beaten tooth.

The utility model for achieving the above object; by the following technical solutions: the protective system of mistake starting in a kind of engineering machinery special engine running; comprise the starter motor of motor and generator, starter relay, safety relay, switch starter, position limit switch, it is characterized in that: described engine-mounted starter motor and generator are connected successively with starter relay, safety relay, switch starter, position limit switch in the bulldozer control circuit.

The beneficial effects of the utility model: this system realizes that motor is in the normal operation process, even shift is also under neutral state, after switch starter is pulled start gear, the actuating coil of starter motor can not be worked, the flywheel of starting gear and motor can not mesh once more, and starting gear can not beaten the function of tooth.Thereby the protection motor can proper functioning, prevents that contingency from taking place.

Description of drawings

Fig. 1 is circuit theory diagrams of the present utility model;

Fig. 2 is the system architecture connection diagram;

Fig. 3 is the switch starter circuit connection diagram;

Embodiment

Content to the technical program is described in detail in conjunction with the accompanying drawings.

As shown in Figure 2; the protective system of mistake starting in a kind of engineering machinery special engine running; the starter motor 2 and generator 1, starter relay 3, safety relay 5, switch starter 4, position limit switch 6 that comprise motor; it is characterized in that: the start gear contact of described switch starter 4 links to each other with starter relay 3 coils one end; the starter relay 3 coil the other ends (ground terminal) link to each other with the contact of safety relay 5, and the contact of safety relay 5 links to each other with position limit switch 6 contacts again.Safety relay 5 coils link to each other with generator output end R.

Be illustrated in figure 1 as the circuit theory diagrams that start the chance error opposed-voltage protective system.The start gear contact of switch starter 4 links to each other with starter relay 3 coils one end among Fig. 1, and the starter relay 3 coil the other ends (ground terminal) link to each other with the contact of safety relay 5, and the contact of safety relay 5 links to each other with position limit switch 6 contacts again.Safety relay 5 coils link to each other with generator output end R.Generator output end R on the motor is the voltage of the inner neutral point of generator, is that half of generator output voltage is 12V.Safety relay 5 coils are the normally closed and relay in contact of voltage rating 12V.Engineering machinery prestart motor is not worked, and promptly generator is also worked, and output terminal R does not have 12V voltage output, and safety relay 5 is not worked, the contact normally closed and.When speed change lever during at neutral position, closed and the ground connection of position limit switch 6 inner contact, the grounding end of starter relay 3 coils is connected and reliable ground successively with the contact of safety relay 5, position limit switch 6, when switch starter 4 is pulled start gear, starter relay 3 coils get electric from starting key R2 through position limit switch, make the starter relay coil have the loop to connect the combination of starter relay contact, it is electric that the actuating coil of starter motor is got, the motor normal starting.When motor in the normal operation process, generator output end R has the power supply of 12V to export to safety relay 5 coils, safety relay 5 proper functioning, the contact disconnects, the grounding end and position limit switch 6 contacts of starter relay 3 coils are disconnected, even shift is also under neutral state like this, stroke position limit switch 6 contact ground connection, the grounding end of starter relay 3 coils can ground connection yet.After switch starter was pulled start gear, the actuating coil of starter motor promptly made the work loop that does not also have behind the electricity.The actuating coil that is starter motor is not worked, thereby avoids the flywheel of starting gear and motor can not mesh once more, and starting gear can not beaten tooth, thereby the protection motor can proper functioning, prevents that contingency from taking place.

The above only is preferred embodiment of the present utility model, is not structure of the present utility model is done any pro forma restriction.Every foundation technical spirit of the present utility model all still belongs in the scope of the technical solution of the utility model any simple modification, equivalent variations and modification that above embodiment did.

Claims

1. an engineering machinery special use prevents to start the chance error opposed-voltage protective system; comprise the starter motor of motor and generator, starter relay, safety relay, switch starter, position limit switch; it is characterized in that: the start gear contact of described switch starter links to each other with starter relay coil one end; the starter relay coil the other end links to each other with the contact of safety relay; the contact of safety relay links to each other with the position limit switch contact again, and the safety relay coil links to each other with generator output end R.