Oil liquid high-temperature protection circuit for small engineering machinery

Abstract

The utility model relates to an oil liquid high-temperature protection circuit for small engineering machinery, and belongs to the technical field of circuit control. Comprising a male plug used for being connected with an engine key switch and three main lines connected with the male plug, the other end of the first main line is provided with an insertion spring terminal used for being connected with an engine motor relay, the other end of the second main line is provided with a bullet male insertion terminal A, and the second main line is further connected with a fuse seat and a diode in series. The second main line between the fuse holder and the diode is connected with a first auxiliary line, and the other end of the first auxiliary line is provided with a wiring terminal A; and the other end of the third main line is provided with a wiring terminal B. The automatic flameout device has the advantages that the automatic flameout function of an engine when the oil temperature is too high can be achieved, the flameout function is divided into a manual flameout function and a temperature protection flameout function, the problem that the oil temperature of equipment is too high and cannot be detected is solved, control over normal operation of the equipment is enhanced, the reliability of operation of the equipment is guaranteed, and the service life of the equipment is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of oil liquid high temperature protection circuit for small engineering machinery, belong to circuit control technical field. BACKGROUND

[0002] Select the gasoline engine 1 of model GX390 as an example: see Figure 1 、 Figure 2 As the motive power source of small engineering machinery equipment, small engineering machinery equipment is also integrated with hydraulic oil tank 2, temperature sensor 3, buzzer 4, engine key switch 5, power-off switch 6 and battery 7.

[0003] Current technology is not comprehensive, with the following disadvantages: the circuit used by existing small engineering machinery usually does not contain detection and feedback of oil temperature (such as wear-resistant hydraulic oil, fuel, etc.), when small engineering machinery equipment runs for a long time, part of the equipment will appear hydraulic oil temperature rise, cannot find and cool down in time, and further lead to its equipment power shortage, serious will cause fire or damage hydraulic motor and gear pump in equipment, so as to not reach the effect required by engineering, greatly delay the progress of engineering.

[0004] To solve one of the above problems, an oil liquid high temperature protection circuit for small engineering machinery is urgently needed. CONTENT OF UTILITY MODEL

[0005] According to the above deficiencies in prior art, the technical problem to be solved by the utility model is: how to realize the function of automatic engine shutdown when oil temperature is too high, and also realize the normal manual engine shutdown function, divide the shutdown function into manual and temperature protection shutdown, and further solve the problem of no detection when equipment oil temperature is too high, enhance the control of equipment normal operation, and provide an oil liquid high temperature protection circuit for small engineering machinery.

[0006] The oil high-temperature protection circuit for small-scale engineering machinery described in the utility model includes a male plug for connecting to an engine key switch and three main lines connected to the male plug, and is characterized in that: the other end of the first main line is equipped with a spring terminal for connecting to an engine motor relay, the other end of the second main line is equipped with a bullet male plug terminal A, and the second main line is also connected in series with a fuse holder and a diode, the second main line between the fuse holder and the diode is connected to a first sub-line, and the other end of the first sub-line is provided with a wiring terminal A; the other end of the third main line is equipped with a wiring terminal B, and the third main line is also connected in series with a buzzer connection terminal, a normally closed / normally open relay, and a temperature sensor connection terminal, the third main line between the buzzer connection terminal and the male plug is connected to a fourth main line, the other end of the fourth main line is connected to the wiring terminal B, and the fourth main line is also connected in series with a normally open relay, the normally closed / normally open relay is connected to the normally open relay through the second sub-line, and the normally closed / normally open relay is connected to the bullet male plug terminal B through the third sub-line.

[0007] Preferably, the fuse holder is a 20A medium-sized fuse holder.

[0008] Preferably, the connection terminal B is an OT2.5-8 cold-pressed terminal.

[0009] Preferably, the buzzer connection terminal is a fork-type UT1-3 terminal with an insulating sleeve, which is used to connect the buzzer in the device.

[0010] Preferably, pins 86 and 85 of the normally open relay are connected in series, and contact 30 of the normally open relay is connected to contact 87a of the normally closed / normally open relay through a second secondary line.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The oil high-temperature protection circuit for small-scale engineering machinery described in the utility model can realize the function of automatic engine shutdown when the oil temperature is too high through various connectors, normally open / normally closed relays, normally open relays, temperature sensors, and buzzers. At the same time, it can also realize the normal manual shutdown function of the engine. The shutdown function is divided into manual and temperature protection shutdown, thereby solving the problem of unawareness of excessively high oil temperature in the equipment, enhancing the control of the normal operation of the equipment, ensuring the reliability of the equipment operation, and increasing the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0014] Figure 1 This is a schematic diagram of the assembly of the main power source of existing small-scale engineering machinery;

[0015] Figure 2 This is a schematic diagram of the decomposition of the main power source of existing small-scale engineering machinery;

[0016] Figure 3 It is a structural diagram of a specific embodiment of the utility model;

[0017] In the figure: 1. Engine 2. Hydraulic oil tank 3. Temperature sensor 4. Buzzer 5. Engine key switch 6. Power cutoff switch 7. Battery 8. Male plug 9. Spring terminal 10. Fuse holder 11. Terminal A 12. Diode 13. Bullet-head male terminal A 14. Buzzer connection terminal 15. Bullet-head female terminal 16. Normally closed / normally open relay 17. Bullet-head male terminal B 18. Temperature sensor connection terminal 19. Terminal B 20. Normally open relay. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings: The present invention will be further illustrated below through specific embodiments, but it is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0019] Example 1, as Figure 3 As shown, the oil high temperature protection circuit for small engineering machinery uses a gasoline engine 1 of model GX390 as an example. Figure 1 、 Figure 2 , as the main power source of small engineering machinery equipment, including a male plug 8 for connecting to the engine key switch; a spring terminal 9 for connecting to the engine motor relay; a terminal A11 for connecting the positive pole of the engine motor relay and a 20A medium-sized fuse holder 10; a bullet-shaped male plug terminal A13 with an insulating sleeve and a diode 12 for connecting the charging coil; a buzzer connection terminal 14 with an insulating sleeve for connecting the buzzer and a temperature sensor connection terminal 18 with an insulating sleeve for connecting the temperature sensor 3, as well as a terminal B19 for grounding and a normally open / normally closed relay 16 and a normally open relay 20 for controlling the shutdown. Finally, it includes a bullet-shaped female plug terminal 15 with an insulating sleeve and a bullet-shaped male plug terminal B17 for connecting the engine high-voltage package shutdown. When the small engineering machinery is operating normally, if the two engine high-voltage package shutdown lines are disconnected, the engine will be shut down at this time.

[0020] Example 2, as Figure 3As shown, the oil liquid high temperature protection circuit for small engineering machinery is selected as a gasoline engine 1 of GX390 type as an example, see Figure 1 、 Figure 2 As the main power source of small engineering machinery, it comprises a male plug 8 for connecting the engine key switch, a spring terminal 9 for connecting the engine motor relay, a terminal A11 for connecting the positive electrode of the engine motor relay and a 20A middle fuse holder 10, a bullet male plug terminal A13 with an insulating sleeve for connecting the charging coil and a diode 12, a buzzer connection terminal 14 with an insulating sleeve for connecting the buzzer and a temperature sensor connection terminal 18 with an insulating sleeve for connecting the temperature sensor, and a terminal B19 for grounding and a normally open / normally closed relay 16 for controlling the engine and a normally open relay 20, and finally a bullet female plug terminal 15 with an insulating sleeve for connecting the engine high-pressure package and a bullet male plug terminal B17 for engine high-pressure package, when the small engineering machinery is running normally, if the two engine high-pressure package lines are disconnected, the engine will be turned off.

[0021] The male plug 8 is a 6.3-6P nylon male plug, the spring terminal 9 is a 6.3 spring terminal with an insulating sleeve, the fuse holder 10 is a 20A middle fuse holder, the terminal A11 is an OT2.5-6 terminal, the bullet male plug terminal A13 and the bullet male plug terminal B17 are bullet terminal male plug with an insulating sleeve, the buzzer connection terminal 14 is a fork type UT1-3 terminal, the bullet female plug terminal 15 is a bullet terminal female plug with an insulating sleeve, the temperature sensor connection terminal 18 is a 6.3 spring terminal with an insulating sleeve, and the terminal B19 is an OT2.5-8 terminal.

[0022] The 6.3-6P nylon male plug, the 6.3 spring terminal with an insulating sleeve, the OT2.5-6 terminal, the 20A middle fuse holder, the bullet terminal male plug with an insulating sleeve, the diode, the 6.3 spring terminal, the OT2.5-8 terminal, the fork type UT1-3 terminal, the normally open / normally closed relay, the normally open relay, and the bullet terminal female plug with an insulating sleeve are all common electrical components on the market. The electrical components mentioned above are connected by wires of different specifications and types, and then transmit electrical signals to realize the control function of the equipment.

[0023] Further, the male plug 8 as the head of the wire harness is used to connect the engine key switch 5 of the equipment, and the other end is connected to each control and sensing electrical component by each connector, thereby realizing the control of the small engineering machinery and the monitoring of the oil liquid temperature, etc.

[0024] Further, the spring terminal 9 is connected to the male plug 8 by a 1.5 mm2 white wire, which is used to connect the motor relay of the GX390 engine 1 to control the on-off of the engine motor relay.

[0025] To ensure the normal operation of the GX390 engine, the terminal A11 is connected to the motor relay of the GX390 engine 1 by a 2.5 mm2 green wire and a fuse holder 10 with a fuse inside, which provides power to the engine and connects a bullet-shaped male terminal A13 with an insulating sleeve in parallel by a 1.5 mm2 red wire and a diode 12 in series, which is used to reverse charge the battery 7 required by the small engineering machinery, to ensure that the battery 7 has sufficient power to meet the normal start-up of the equipment next time.

[0026] After the GX390 engine 1 is started, the terminal B19 is connected to the power-off switch 6 of the equipment to control the on-off of the total power supply, and then connected to the male plug 8 by a 1 mm2 blue wire, one way is connected to the 86 and 85 pins of the normally open relay 20 in series and then connected to the male plug 8, while the 87 contact of the normally open relay 20 is connected to the bullet-shaped female terminal 15 with an insulating sleeve by a 1 mm2 gray wire, and the 30 contact is connected to the 87a contact of the normally closed / open relay 16, while the 30 contact of the normally closed / open relay 16 is connected to the bullet-shaped male terminal B17 with an insulating sleeve by a 1 mm2 brown wire, thereby realizing the control of the engine start-stop through the engine key switch 5. The other way is connected to the temperature sensor connection terminal 18 in series, which is used to connect the temperature sensor 3 for detecting the temperature of the hydraulic oil in the hydraulic oil tank 2 of the equipment, and is connected to the 85 and 86 contacts of the normally closed / open relay 16 and the buzzer connection terminal 14 with an insulating sleeve, while the buzzer connection terminal 14 with an insulating sleeve is used to connect the buzzer 4 in the equipment, and then connected to the male plug 8. This way is through the high temperature of the oil in the engineering machinery, when the temperature sensor is heated to the internal set temperature, the internal contact is closed, and this circuit is formed, so the buzzer and the relay are powered on, at this time the buzzer buzzes, and the 30 and 87a contacts controlled by the normally open / closed relay are disconnected, at this time the engine is turned off, realizing the function of not being able to continue to operate due to high oil temperature, thereby prolonging the service life of the small engineering machinery.

[0027] The basic principle, main features and advantages of the utility model are shown and described above. The skilled in the art should understand that the utility model is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principle of the utility model, and the utility model can have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The scope of protection of the utility model is defined by the appended claims and their equivalents.

[0028] The parts not described in the utility model are well-known to the skilled in the art.

Claims

1. An oil-temperature-protection circuit for small construction machines, comprising a male plug (8) for connecting to an engine key switch and three main lines connected to the male plug (8), characterized in that: The other end of the first main wire is installed with a spring terminal (9) for connecting the engine motor relay, the other end of the second main wire is installed with a bullet male plug terminal A (13), and the second main wire is also connected in series with a fuse holder (10) and a diode (12), the second main wire between the fuse holder (10) and the diode (12) is connected with a first secondary wire, the other end of the first secondary wire is provided with a wiring terminal A (11); the other end of the third main wire is installed with a wiring terminal B (19), and the third main wire is also connected in series with a buzzer connection terminal (14), a normally closed / normally open relay (16) and a temperature sensor connection terminal (18), the third main wire between the buzzer connection terminal (14) and the male plug (8) is connected with a fourth main wire, the other end of the fourth main wire is connected to the wiring terminal B (19), and the fourth main wire is also connected in series with a normally open relay (20), the normally closed / normally open relay (16) is connected with the normally open relay (20) through a second secondary wire, and the normally closed / normally open relay (16) is connected with a bullet male plug terminal B (17) through a third secondary wire.

2. The oil-temperature protection circuit for a small construction machine according to claim 1, characterized by The fuse holder (10) adopts a 20A middle size fuse holder.

3. The oil-temperature protection circuit for a small construction machine according to claim 1, characterized by The wiring terminal B (19) is an OT2.5-8 cold pressure terminal.

4. The oil-temperature protection circuit for a small construction machine according to claim 1, characterized by The buzzer connection terminal (14) is a fork type UT1-3 terminal with an insulating sleeve, which is used for connecting the buzzer (4) in the device.

5. The oil-temperature protection circuit for a small construction machine according to claim 1, wherein The 86 and 85 pins of the normally open relay (20) are connected in series, and the 30 contact of the normally open relay (20) is connected with the 87a contact of the normally closed / normally open relay (16) through the second secondary wire.

Images