Control circuit of flameout electromagnetic valve for micro excavation

Abstract

The utility model relates to the field of engineering machinery, in particular to a control circuit of a flameout electromagnetic valve for micro excavation, which comprises a key switch, a power supply and a flameout electromagnetic valve, a pull-in coil and a holding coil are arranged on the flameout electromagnetic valve, the pull-in coil is connected with the power supply to form a power supply loop, and the holding coil is also connected with the power supply to form a power supply loop. The key switch is mounted on a power supply loop of the pull-in coil and a power supply loop of the holding coil, a flameout electromagnetic valve relay for controlling the circuit access of the pull-in coil during starting is mounted on the power supply loop of the pull-in coil, and a normally open contact of the flameout electromagnetic valve relay is connected to the power supply loop of the pull-in coil. According to the control circuit of the flameout electromagnetic valve for micro excavation, the working condition that the pull-in coil of the flameout electromagnetic valve is only electrified for a short time can be achieved under the condition that a timing relay is not used, and therefore the service life of the flameout electromagnetic valve is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the field of engineering machinery, in particular to a control circuit of a flameout solenoid valve for a micro excavator. Background Art

[0002] An excavator is a type of engineering machinery widely used in earthwork construction. A bucket is provided on the front side of the excavator, and the bucket is connected to the excavator through a boom and an arm. A boom cylinder for controlling the movement of the arm is installed on the upper part of the boom. In addition, a boom cylinder for controlling the movement of the boom is also installed on the excavator. The boom cylinder is supplied with oil through the boom lifting oil circuit, and the boom lifting and falling are controlled by the boom cylinder; the movement of the bucket is controlled by the rocker arm cylinder, which is supplied with oil through the bucket retracting oil circuit, and the rocker arm rotation is controlled by the rocker arm cylinder, driving the bucket to complete the retracting and digging actions.

[0003] At present, the engine shutdown solenoid valve without ECU is divided into a pull-in coil and a holding coil. The pull-in coil has a working current of more than 30A, and long-term operation will cause the coil to burn out. In order to avoid the above problem, the traditional solution is to use a timing relay to control the power supply of the coil at a fixed time (1-5s), but it still cannot completely eliminate the problem and needs to be improved. Utility Model Content

[0004] The utility model aims to provide a control circuit of a flameout solenoid valve for a micro excavator, which can effectively prevent the flameout solenoid valve's separate suction and pull coil from burning, in view of the above problems.

[0005] To achieve the above-mentioned purpose, the utility model discloses a control circuit of a flameout solenoid valve for a micro excavator, comprising a key switch, a power supply and a flameout solenoid valve, and its structural features are: a pull-in coil and a holding coil are provided on the flameout solenoid valve, the pull-in coil is connected to the power supply to form a power supply circuit, the holding coil is also connected to the power supply to form a power supply circuit, the key switch is installed on the power supply circuit of the holding coil, and a flameout solenoid valve relay is installed on the power supply circuit of the pull-in coil to control its line path at startup.

[0006] After adopting the above structure, after the key switch is turned on, the holding coil is energized, but the valve core of the flameout solenoid valve cannot be pulled by the holding coil alone. When the key switch is changed to the starting gear, the flameout solenoid valve relay is energized, the circuit of the suction and pull coil is energized, and the valve core of the flameout solenoid valve is pulled. After the starting is completed, the suction and pull coil is de-energized, and the holding coil can hold the valve core of the flameout solenoid valve. The holding coil will not be de-energized until the key switch is turned off. The valve core of the flameout solenoid valve returns to its original position, blocking the oil channel. Without the supply of diesel, the engine is turned off. In this way, the flameout solenoid valve can be energized for only a short time without using a timing relay, thereby effectively extending the service life of the flameout solenoid valve.

[0007] Regarding the contact connection structure of the flameout solenoid valve relay, the normally open contact of the flameout solenoid valve relay is connected to the power supply circuit of the pull coil.

[0008] Regarding the circuit connection structure of the power supply, the negative pole of the power supply is connected to the vehicle body, and the positive pole of the power supply is connected to the key switch.

[0009] Regarding the connection structure between the coil of the flameout solenoid valve and the power supply, one end of the coil of the flameout solenoid valve is connected to the key switch, and the other end of the coil of the flameout solenoid valve is connected to the vehicle body.

[0010] Preferably, the coil of the flameout solenoid valve relay is connected to the start position of the key switch.

[0011] Preferably, one end of the holding coil is connected to the key switch, and the other end of the holding coil is connected to the vehicle body.

[0012] Preferably, the holding coil is connected to the ACC position of the key switch.

[0013] Preferably, one end of the pull-in coil is connected to a power source, and the other end of the pull-in coil is connected to a vehicle body.

[0014] To sum up, the beneficial effect of the utility model is that after the key switch is turned on, the holding coil is energized, but the valve core of the flameout solenoid valve cannot be pulled by relying solely on the holding coil. When the key switch is changed to the starting gear, the flameout solenoid valve relay is energized, the circuit of the suction and pull coil is energized, and the valve core of the flameout solenoid valve is pulled. After the starting is completed, the suction and pull coil is de-energized, and the holding coil can hold the valve core of the flameout solenoid valve. The holding coil will not be de-energized until the key switch is turned off, and the valve core of the flameout solenoid valve returns to its original position, blocking the oil channel. Without the supply of diesel, the engine is turned off. In this way, the flameout solenoid valve can be energized for only a short time without using a timing relay, thereby effectively extending the service life of the flameout solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the circuit structure of the utility model.

[0016] In the figure: key switch 1, power supply 2, flameout solenoid valve relay 3, flameout solenoid valve 4, suction and pull coil 5, holding coil 6. DETAILED DESCRIPTION

[0017] 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.

[0018] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0019] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0020] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0021] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0022] A control circuit of a flameout solenoid valve 4 for a micro excavator includes a key switch 1, a power supply 2 and a flameout solenoid valve 4, and its structural features are: a pull-in coil 5 and a holding coil 6 are provided on the flameout solenoid valve 4, the pull-in coil 5 is connected to the power supply 2 to form a power supply circuit, and the holding coil 6 is also connected to the power supply 2 to form a power supply circuit, the key switch 1 is installed on the power supply circuit of the holding coil 6, and a flameout solenoid valve relay 3 for controlling its circuit path at startup is installed on the power supply circuit of the pull-in coil 5. Figure 1After adopting the above structure, after the key switch 1 is turned on, the holding coil 6 is energized, but the valve core of the flameout solenoid valve 4 cannot be pulled by relying solely on the holding coil 6. When the key switch 1 is changed to the starting gear, the flameout solenoid valve relay 3 is energized, the circuit of the suction and pull coil 5 is energized, and the valve core of the flameout solenoid valve 4 is pulled. After the start is completed, the suction and pull coil 5 is de-energized, and the holding coil 6 can hold the valve core of the flameout solenoid valve 4. The holding coil 6 will not be de-energized until the key switch 1 is turned off, and the valve core of the flameout solenoid valve 4 returns to its original position, blocking the oil channel. Without the supply of diesel, the engine is turned off. In this way, the flameout solenoid valve 4 can be energized for only a short time without using a timing relay, thereby effectively extending the service life of the flameout solenoid valve 4.

[0023] See attached Figure 1 Regarding the contact connection structure of the flameout solenoid valve relay 3, the normally open contact of the flameout solenoid valve relay 3 is connected to the power supply circuit of the pull-in coil 5. Regarding the circuit connection structure of the power supply 2, the negative pole of the power supply 2 is connected to the vehicle body, and the positive pole of the power supply 2 is connected to the key switch 1. Regarding the connection structure between the coil of the flameout solenoid valve 4 and the power supply 2, one end of the coil of the flameout solenoid valve 4 is connected to the key switch 1, and the other end of the coil of the flameout solenoid valve 4 is connected to the vehicle body.

[0024] See attached Figure 1 , the coil of the flameout solenoid valve relay 3 is connected to the start position of the key switch 1. One end of the holding coil 6 is connected to the key switch 1, and the other end of the holding coil 6 is connected to the vehicle body. The holding coil 6 is connected to the start position of the key switch 1. One end of the pull coil 5 is connected to the power supply 2, and the other end of the pull coil 5 is connected to the vehicle body.

[0025] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A control circuit for a flameout solenoid valve for a micro excavator, comprising a key switch (1), a power supply (2) and a flameout solenoid valve (4), characterized in that: The flameout solenoid valve (4) is provided with a pull-in coil (5) and a holding coil (6); the pull-in coil (5) is connected to a power supply (2) to form a power supply circuit; the holding coil (6) is also connected to the power supply (2) to form a power supply circuit; the key switch (1) is mounted on the power supply circuit of the holding coil (6); and a flameout solenoid valve relay (3) is mounted on the power supply circuit of the pull-in coil (5) to control its circuit path when starting.

2. The control circuit of the flameout solenoid valve for micro excavation according to claim 1, characterized in that: The normally open contact of the flameout solenoid valve relay (3) is connected to the power supply circuit of the pull-in coil (5).

3. The control circuit of the flameout solenoid valve for micro excavation according to claim 1, characterized in that: The negative electrode of the power source (2) is connected to the vehicle body, and the positive electrode of the power source (2) is connected to the key switch (1).

4. The control circuit of the flameout solenoid valve for micro excavation according to claim 3, characterized in that: One end of the coil of the flameout solenoid valve (4) is connected to the key switch (1), and the other end of the coil of the flameout solenoid valve (4) is connected to the vehicle body.

5. The control circuit of the flameout solenoid valve for micro excavation according to claim 4, characterized in that: The coil of the flameout solenoid valve relay (3) is connected to the start position of the key switch (1).

6. The control circuit of the flameout solenoid valve for micro excavation according to claim 3, characterized in that: One end of the holding coil (6) is connected to the ACC position of the key switch (1), and the other end of the holding coil (6) is connected to the vehicle body.

7. The control circuit of the flameout solenoid valve for micro excavation according to claim 3, characterized in that: One end of the pull-in coil (5) is connected to the normally open contact of the flameout solenoid valve relay (3), and the other end of the pull-in coil (5) is connected to the vehicle body.

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