Four-wheel-drive and two-wheel-drive switching control circuit of backhoe loader

Abstract

The utility model relates to the field of backhoe loader brake control, and discloses a backhoe loader four-wheel-drive and two-wheel-drive switching control circuit which comprises a frequently-used electric power source, a four-wheel-drive control circuit and a brake control circuit are connected to the frequently-used electric power source in parallel, and the four-wheel-drive control circuit and the brake control circuit are electrically connected to a gearbox controller. The gearbox controller is electrically connected with a normally-closed relay, the normally-closed relay is electrically connected with a four-wheel-drive electromagnetic valve and a detection circuit matched with the four-wheel-drive control circuit and the brake control circuit, and the four-wheel-drive control circuit is provided with a mode control switch, a diode n1 and a first normally-open relay. The brake control circuit is provided with a brake control switch, a diode n2 and a second normally open relay. According to the utility model, the operation is simple and convenient, the safety is good, the applicability and the flexibility of the equipment are enhanced, and the reliability of the equipment is improved.

Description

Technical Field

[0001] The utility model relates to the field of four-wheel brake control for an excavator loader, in particular to a four-wheel drive to two-wheel drive conversion control circuit for an excavator loader. Background Art

[0002] At present, backhoe loaders are multifunctional engineering machinery equipment widely used in the fields of construction, municipal administration, highway, railway, etc. In actual operation, backhoe loaders usually need to switch between four-wheel drive mode and two-wheel drive mode according to different working environments and operating requirements.

[0003] Existing backhoe loaders have some limitations in the switching control of the four-wheel drive and two-wheel drive functions. First, the existing switching control system can usually only be manually controlled through a rocker switch. This control method is relatively simple and is not conducive to the operator's flexible adjustment according to actual needs. Secondly, the existing switching control system cannot provide early warning protection when a fault occurs, which may cause the operator to continue to use it without knowing it, thereby causing safety accidents or equipment damage. Finally, during the braking process, if the backhoe loader is in the two-wheel drive mode, the existing braking system may not be able to provide sufficient braking force, resulting in poor braking effect and affecting operational safety. Therefore, in view of the shortcomings of the existing backhoe loader's four-wheel drive and two-wheel drive function switching control, it is necessary to propose a new control method and system to solve the problems existing in the prior art. Utility Model Content

[0004] The utility model aims to provide a control circuit for converting a backhoe loader into a four-wheel drive or two-wheel drive in view of the above problems.

[0005] To achieve the above-mentioned purpose, the utility model discloses a four-wheel drive to two-wheel drive conversion control circuit for an excavator loader, comprising a common power supply, a four-wheel drive control circuit and a brake control circuit are connected in parallel to the common power supply, the four-wheel drive control circuit and the brake control circuit are electrically connected to a transmission controller, the transmission controller is electrically connected to a normally closed relay, the normally closed relay is electrically connected to a four-wheel drive solenoid valve and a detection circuit coordinated with the four-wheel drive control circuit and the brake control circuit, the four-wheel drive control circuit is provided with a mode control switch and a diode n1 and a first normally open relay electrically connected to the circuit between the mode control switch and the diode n1, the brake control circuit is provided with a brake control switch and a diode n2 and a second normally open relay electrically connected to the circuit between the brake control switch and the diode n2.

[0006] After adopting the above structure, the four-wheel drive control and two-wheel drive conversion control in two modes are realized through the structure of the four-wheel drive control circuit and the brake control circuit. By setting the mode control switch and the brake control switch, the operator can select the brake and control mode according to the actual working environment requirements, thereby enhancing the applicability and flexibility of the equipment. By setting the detection circuit and the instrument alarm light, the working status of the circuit can be monitored in real time, and the operator can be reminded in time when a fault occurs, thereby reducing safety hazards and improving the reliability of the equipment.

[0007] Preferably, the first normally open relay includes a first relay normally open contact power-on circuit and a first relay coil power-on circuit, the input end circuit of the first relay normally open contact power-on circuit and the input end circuit of the first relay coil power-on circuit are electrically connected to the four-wheel drive control circuit between the mode control switch and the diode n1, and the output end circuit of the first relay normally open contact power-on circuit is electrically connected to the first display instrument.

[0008] Preferably, the second normally open relay includes a second relay normally open contact power-on circuit and a second relay coil power-on circuit, the input end circuit of the second relay normally open contact power-on circuit and the input end circuit of the second relay coil power-on circuit are electrically connected to the brake control circuit between the brake control switch and the diode n2, and the output end circuit of the second relay normally open contact power-on circuit is electrically connected to a second display instrument.

[0009] Preferably, the electrical signal directions of the diode n1 and the diode n2 are both output from a common electrical power source to the transmission controller.

[0010] Preferably, one end of the detection circuit is connected in series to the four-wheel drive control circuit and the brake control circuit and is located in the circuit between the diode n1 and the diode n2 and the transmission controller, and the other end of the detection circuit is electrically connected to the normally closed relay. The detection circuit is provided with a normally open pressure switch that cooperates with the transmission detection oil circuit, and the circuit at the rear end of the normally open pressure switch is electrically connected to an instrument warning light.

[0011] Preferably, the normally closed relay includes a relay normally closed contact power-on circuit and a third relay coil power-on circuit, the input end of the third relay coil power-on circuit is electrically connected to the detection circuit, the input end circuit of the relay normally closed contact power-on circuit is electrically connected to the electrical signal output end of the transmission controller, and the output end circuit of the relay normally closed contact power-on circuit is electrically connected to the four-wheel drive solenoid valve.

[0012] To sum up, the beneficial effects of the utility model are: the utility model is easy to operate and has good safety. Through the structure of the four-wheel drive control circuit and the brake control circuit, the four-wheel drive and two-wheel drive conversion control in two modes is realized. By setting the mode control switch and the brake control switch, the operator can select the braking and control mode according to the actual working environment requirements, thereby enhancing the applicability and flexibility of the equipment. By setting the detection circuit and the instrument alarm light, the working status of the circuit can be monitored in real time, and the operator can be reminded in time when a fault occurs, thereby reducing safety hazards and improving the reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the electrical schematic diagram of the utility model as a whole.

[0014] In the figure: 1. Common power supply; 2. Four-wheel drive control circuit; 3. Braking control circuit; 4. Transmission controller; 5. Normally closed relay; 6. Four-wheel drive solenoid valve; 7. Detection circuit; 8. Mode control switch; 9. Diode n1; 10. First normally open relay; 11. Braking control switch; 12. Diode n2; 13. Second normally open relay; 14. First relay normally open contact power circuit; 15. First relay coil power circuit; 16. First display instrument; 17. Second relay normally open contact power circuit; 18. Second relay coil power circuit; 19. Second display instrument; 20. Normally open pressure switch; 21. Instrument warning light; 22. Relay normally closed contact power circuit; 23. Third relay coil power circuit; 24. Electrical signal output terminal. DETAILED DESCRIPTION

[0015] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0016] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0017] like Figure 1As shown, the utility model includes a common power supply 1, a four-wheel drive control circuit 2 and a brake control circuit 3 are connected in parallel to the common power supply 1, the four-wheel drive control circuit 2 and the brake control circuit 3 are electrically connected to the signal input end of the transmission controller 4, a mode control switch 8 and a diode n19 and a first normally open relay 10 electrically connected to the circuit between the mode control switch 8 and the diode n19 are arranged on the four-wheel drive control circuit 2, and a brake control switch 11 and a diode n212 and a second normally open relay 13 electrically connected to the circuit between the brake control switch 11 and the diode n212 are arranged on the brake control circuit 3. When designed, the first normally open relay 10 includes a first relay normally open contact power-on circuit 14 and a first relay coil power-on circuit 15, and the input end circuit of the first relay normally open contact power-on circuit 14 is connected to the first The input circuit of the relay coil power-on circuit 15 is electrically connected to the four-wheel drive control circuit 2 between the mode control switch 8 and the diode n19, and the output circuit of the first relay normally open contact power-on circuit 14 is electrically connected to the first display instrument 16. The above-mentioned second normally open relay 13 includes a second relay normally open contact power-on circuit 17 and a second relay coil power-on circuit 18. The input circuit of the second relay normally open contact power-on circuit 17 and the input circuit of the second relay coil power-on circuit 18 are electrically connected to the brake control circuit 3 between the brake control switch 11 and the diode n212, and the output circuit of the second relay normally open contact power-on circuit 17 is electrically connected to the second display instrument 19. During manufacturing, the electrical signal directions of the diode n19 and the diode n212 are both output from the common power supply 1 to the transmission controller 4.

[0018] A normally closed relay 5 is electrically connected to the transmission controller 4, and a four-wheel drive solenoid valve 6 and a detection circuit 7 coordinated with the four-wheel drive control circuit 2 and the brake control circuit 3 are electrically connected to the normally closed relay 5. During design, one end of the detection circuit 7 is connected in series with the four-wheel drive control circuit 2 and the brake control circuit 3 and is located in the circuit between the diode n19 and the diode n212 and the transmission controller 4, and the other end of the detection circuit 7 is electrically connected to the normally closed relay 5. A normally open pressure switch 20 coordinated with the transmission detection oil circuit is provided on the detection circuit 7, and an instrument warning light 21 is electrically connected to the circuit at the rear end of the normally open pressure switch 20, and the above-mentioned normally closed relay 5 includes a relay normally closed contact power-on circuit 22 and a third relay coil power-on circuit 23, wherein the input end of the third relay coil power-on circuit 23 is electrically connected to the detection circuit 7, and the input end circuit of the relay normally closed contact power-on circuit 22 is electrically connected to the electrical signal output end 24 of the transmission controller 4, and the output end circuit of the relay normally closed contact power-on circuit 22 is electrically connected to the four-wheel drive solenoid valve 6.

[0019] During use, when the working condition of the whole vehicle is complicated and it is necessary to switch from two-wheel drive to four-wheel drive, press the mode control switch 8, at this time, the first relay coil power circuit 15 is energized, so that the switch on the first relay normally open contact power circuit 14 is attracted and the first display instrument 16 displays the four-wheel drive state. At the same time, the electrical signal of the four-wheel drive control circuit 2 enters the gearbox controller 4, and the electrical signal of the gearbox controller 4 controls the four-wheel drive solenoid valve 6 along the relay normally closed contact power circuit 22; when the whole vehicle brakes, due to the special working conditions, the two-wheel drive braking force is insufficient. At this time, it is necessary to step on the brake pedal, and the brake control switch 11 on the brake control circuit 3 is closed, so that the switch on the second relay normally open contact power circuit 17 is attracted and the second display instrument Table 19 shows the braking control state, in which the electrical signal of the braking control circuit 3 enters the transmission controller 4 and the electrical signal output terminal 24 of the transmission controller 4 controls the four-wheel drive solenoid valve 6 for braking. Through this control, the vehicle changes from two-wheel drive to four-wheel drive during braking, increasing the braking force, and the two diodes are unidirectionally conducted, and the states of the instrument indicator lights do not affect each other; when in the above two states, if the pressure is too high due to a fault, the transmission detection oil circuit will control the normally open pressure switch 20 to close, thereby energizing the detection circuit 7 and the instrument warning light 21 flashing, and at the same time, the third relay coil energizing circuit 23 is energized, so that the switch of the relay normally closed contact energizing circuit 22 is disconnected, and the four-wheel drive solenoid valve 6 stops working.

[0020] The above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A four-wheel drive to two-wheel drive conversion control circuit for an excavator loader, comprising a common power supply (1), characterized in that: The common power supply (1) is connected in parallel with a four-wheel drive control circuit (2) and a brake control circuit (3); the four-wheel drive control circuit (2) and the brake control circuit (3) are electrically connected to a transmission controller (4); the transmission controller (4) is electrically connected with a normally closed relay (5); the normally closed relay (5) is electrically connected with a four-wheel drive solenoid valve (6) and a detection circuit (7) coordinated with the four-wheel drive control circuit (2) and the brake control circuit (3); the four-wheel drive control circuit (2) is provided with a mode control switch (8) and a diode n1 (9) and a first normally open relay (10) electrically connected to the circuit between the mode control switch (8) and the diode n1 (9); the brake control circuit (3) is provided with a brake control switch (11) and a diode n2 (12) and a second normally open relay (13) electrically connected to the circuit between the brake control switch (11) and the diode n2 (12).

2. The four-wheel drive to two-wheel drive conversion control circuit of the backhoe loader according to claim 1, characterized in that: The first normally open relay (10) comprises a first relay normally open contact power-on circuit (14) and a first relay coil power-on circuit (15); an input end circuit of the first relay normally open contact power-on circuit (14) and an input end circuit of the first relay coil power-on circuit (15) are electrically connected to the four-wheel drive control circuit (2) between the mode control switch (8) and the diode n1 (9); and an output end circuit of the first relay normally open contact power-on circuit (14) is electrically connected to a first display instrument (16).

3. The four-wheel drive to two-wheel drive conversion control circuit of the backhoe loader according to claim 1, characterized in that: The second normally open relay (13) comprises a second relay normally open contact power-on circuit (17) and a second relay coil power-on circuit (18); an input end circuit of the second relay normally open contact power-on circuit (17) and an input end circuit of the second relay coil power-on circuit (18) are electrically connected to a brake control circuit (3) between a brake control switch (11) and a diode n2 (12); and an output end circuit of the second relay normally open contact power-on circuit (17) is electrically connected to a second display instrument (19).

4. The four-wheel drive to two-wheel drive conversion control circuit of the backhoe loader according to claim 1, characterized in that: The electrical signal directions of the diode n1 (9) and the diode n2 (12) are both output from the common electrical power source (1) to the gearbox controller (4).

5. The four-wheel drive to two-wheel drive conversion control circuit of the backhoe loader according to claim 1, characterized in that: One end of the detection circuit (7) is connected in series to the four-wheel drive control circuit (2) and the brake control circuit (3) and is located in the circuit between the diode n1 (9) and the diode n2 (12) and the gearbox controller (4); the other end of the detection circuit (7) is electrically connected to the normally closed relay (5); a normally open pressure switch (20) matched with the gearbox detection oil circuit is provided on the detection circuit (7); and an instrument warning light (21) is electrically connected to the circuit at the rear end of the normally open pressure switch (20).

6. The four-wheel drive to two-wheel drive conversion control circuit of the backhoe loader according to claim 1, characterized in that: The normally closed relay (5) comprises a relay normally closed contact power-on circuit (22) and a third relay coil power-on circuit (23); an input end of the third relay coil power-on circuit (23) is electrically connected to a detection circuit (7); an input end circuit of the relay normally closed contact power-on circuit (22) is electrically connected to an electrical signal output end (24) of a transmission controller (4); and an output end circuit of the relay normally closed contact power-on circuit (22) is electrically connected to a four-wheel drive solenoid valve (6).

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