Liquid level alarm device for hydraulic system of carry-scraper

Abstract

The utility model discloses a liquid level alarm device for a hydraulic system of a carry-scraper. The liquid level alarm device comprises a liquid level sensor S1, a liquid level sensor S2 and a liquid level sensor S3 which are arranged in an oil tank of the hydraulic system from top to bottom, the system further comprises a control circuit, the control circuit comprises a relay KA1, a relay KA2, a relay KA3 and a time relay KT, and the control circuit is further connected with a primary alarm unit ALM1, a secondary alarm unit ALM2 and an emergency execution device. According to the utility model, a plurality of groups of liquid level sensors are adopted for real-time detection, and different alarm units are triggered according to different liquid level heights, so that the problem of untimely alarm is solved, and meanwhile, the device also has the functions of detecting whether the liquid level drops too fast and stopping oil supply in time.

Description

Technical Field

[0001] The utility model relates to a liquid level alarm device, in particular to a liquid level alarm device of a hydraulic system. Background Art

[0002] Hydraulic oil is the hydraulic medium used in hydraulic systems that utilize liquid pressure energy. It plays the roles of energy transmission, anti-wear, system lubrication, corrosion prevention, rust prevention, and cooling in hydraulic systems.

[0003] At present, Jiaojia Gold Mine is using more than 70 ST-2D scrapers. In the complex environment underground, the wear and damage rate of the oil pipes in the hydraulic system is increasing, and the consumption of hydraulic oil is increasing. When the hydraulic oil circuit leaks, it is difficult for the operator to find it in time, and when it is found, it usually causes the equipment to lose oil, which may damage the pump and valve spare parts at the least, or even cause damage to the pump and valve spare parts at the worst. Utility Model Content

[0004] The utility model provides a liquid level alarm device for a hydraulic system of a scraper, the purpose of which is to solve the problem of delayed discovery of hydraulic oil leakage.

[0005] The technical solution of this utility model is as follows:

[0006] A liquid level alarm device for a hydraulic system of a scraper, comprising a liquid level sensor, wherein the liquid level sensor comprises a liquid level sensor S1, a liquid level sensor S2 and a liquid level sensor S3 arranged from top to bottom and installed in a hydraulic system oil tank;

[0007] The hydraulic system liquid level alarm device of the scraper also includes a control circuit, which includes a relay KA1, a relay KA2, a relay KA3 and a time relay KT. The control circuit is also connected to a primary alarm unit ALM1, a secondary alarm unit ALM2 and an emergency execution device;

[0008] The normally open contact of the liquid level sensor S1 and the coil of the relay KA1 are connected in series between the positive and negative electrodes of the power supply, and the coil of the time relay KT is connected in parallel with the coil of the relay KA1;

[0009] The first normally open contact of the relay KA1 and the normally closed contact of the time relay KT are connected in series and then connected in parallel with the first normally open contact of the relay KA2, and then connected in series with the normally open contact of the liquid level sensor S2 and the coil of the relay KA2 between the positive and negative electrodes of the power supply;

[0010] The second normally open contact of the relay KA1 and the first-level alarm unit ALM1 are connected in series between the positive and negative electrodes of the power supply, and the relay KA1 is used to trigger the first-level alarm unit ALM1 to alarm;

[0011] The second normally open contact of the relay KA2 and the secondary alarm unit ALM2 are connected in series between the positive and negative poles of the power supply. The relay KA2 is used to trigger the alarm of the secondary alarm unit ALM2;

[0012] The normally open contact of the liquid level sensor S3 and the coil of the relay KA3 are connected in series between the positive and negative poles of the power supply; the relay KA3 is used to trigger the emergency execution device to close the fuel supply pipeline of the scraper.

[0013] As a further improvement of the liquid level alarm device for the hydraulic system of the scraper: the primary alarm unit ALM1 is an alarm lamp.

[0014] As a further improvement of the liquid level alarm device for the hydraulic system of the scraper: the secondary alarm unit ALM2 is an alarm horn.

[0015] As a further improvement of the liquid level alarm device for the hydraulic system of the scraper: the emergency execution device is a solenoid valve installed on the fuel supply pipeline of the scraper, and the electromagnet YA of the solenoid valve is connected in series with the normally open contact of the relay KA3 between the positive and negative poles of the power supply.

[0016] As a further improvement of the liquid level alarm device for the hydraulic system of the scraper: the liquid level sensor S1 is installed at 40% of the full liquid level of the fuel tank, the liquid level sensor S2 is installed at 30% of the full liquid level of the fuel tank, and the liquid level sensor S3 is installed at 10% of the full liquid level of the fuel tank.

[0017] Compared with the prior art, the present utility model has the following positive effects:

[0018] 1. The present utility model uses multiple groups of liquid level sensors for real-time detection, and triggers different alarm units according to different liquid level heights, thereby solving the problem of untimely alarm.

[0019] 2. The present utility model realizes the detection of too fast leakage through the adjacent liquid level sensors S1, S2 and the time relay. When the liquid level drops to S1 and immediately reaches S2 within a short time, a sound alarm will be issued, thereby playing a stronger reminder role.

[0020] 3. The liquid level sensor S3 of the present utility model cooperates with the solenoid valve. When the liquid level is too low, the fuel supply is directly closed, avoiding accidents caused by the uncertain working state of components such as the oil cylinder due to unstable oil pressure. Description of the Drawings

[0021] Figure 1 is the electrical schematic diagram of the present utility model;

[0022] Figure 2 is the installation schematic diagram of three groups of liquid level sensors in the fuel tank. Detailed Description of the Invention

[0023] The technical solution of the present utility model will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0024] A hydraulic system liquid level alarm device for a scraper, comprising a liquid level sensor S1, a liquid level sensor S2, and a liquid level sensor S3 which are arranged and installed in a hydraulic system fuel tank from top to bottom.

[0025] As Figure 2 , in this embodiment, the liquid level sensor S1 is installed at 40% of the full liquid level of the fuel tank, the liquid level sensor S2 is installed at 30% of the full liquid level of the fuel tank, and the liquid level sensor S3 is installed at 10% of the full liquid level of the fuel tank.

[0026] As Figure 1 , the hydraulic system liquid level alarm device for the scraper further comprises a control circuit, the control circuit includes a relay KA1, a relay KA2, a relay KA3, and a time relay KT, and the control circuit is further connected with a first-level alarm unit ALM1, a second-level alarm unit ALM2, and an emergency execution device.

[0027] The normally open contact of the liquid level sensor S1 and the coil of the relay KA1 are connected in series between the positive pole and the negative pole of the power supply, and the coil of the time relay KT is connected in parallel with the coil of the relay KA1. The action time of the time relay KT is from half an hour to 2 hours, and it is set to 1 hour in this embodiment.

[0028] The first normally open contact of the relay KA1 and the normally closed contact of the time relay KT are connected in series and then in parallel with the first normally open contact of the relay KA2, and then are connected in series with the normally open contact of the liquid level sensor S2 and the coil of the relay KA2 between the positive pole and the negative pole of the power supply.

[0029] The second normally open contact of the relay KA1 and the first-level alarm unit ALM1 are connected in series between the positive pole and the negative pole of the power supply, and the relay KA1 is used to trigger the first-level alarm unit ALM1 to alarm. In this embodiment, the first-level alarm unit ALM1 is an alarm lamp.

[0030] The second normally open contact of the relay KA2 and the second-level alarm unit ALM2 are connected in series between the positive pole and the negative pole of the power supply, and the relay KA2 is used to trigger the second-level alarm unit ALM2 to alarm. In this embodiment, the second-level alarm unit ALM2 is an alarm horn.

[0031] The normally open contact of the liquid level sensor S3 and the coil of the relay KA3 are connected in series between the positive and negative poles of the power supply. The relay KA3 is used to trigger the emergency execution device to close the fuel supply pipeline of the scraper. In this embodiment, the emergency execution device is a solenoid valve installed on the fuel supply pipeline of the scraper, and the electromagnet YA of the solenoid valve is connected in series with the normally open contact of the relay KA3 between the positive and negative poles of the power supply.

[0032] During operation, if there is a leak in the fuel tank, the liquid level will drop significantly: when the liquid level drops to the liquid level sensor S1, the normally open contact of the liquid level sensor S1 closes, the relay KA1 is energized, and the time relay KT starts timing. At this time, the alarm light is triggered to light up, prompting the staff that there may be a leak and they should check it in time. If the liquid level continues to drop to the liquid level sensor S2 and the timing of the time relay KT has not ended when it reaches S2, it means that the liquid level drops relatively fast. At this time, the normally open contact of the liquid level sensor S2 closes, and the first normally open contact of the relay KA1 must have closed, so the relay KA2 is energized, and the alarm horn will be triggered to start sounding an audible alarm, prompting the staff to take relevant measures immediately. If the timing time of the time relay KT has passed when the liquid level drops to the liquid level sensor S2, the normally closed contact of the time relay KT will be in the open state, and the alarm horn will not work, and the alarm is still given through the alarm light. When the liquid level drops to the liquid level sensor S3, the relay KA3 is energized, directly triggering the solenoid valve to act and closing the fuel supply pipeline of the hydraulic system (in the cut-off state), stopping the pressure fuel supply of other components before the hydraulic oil in the fuel tank is exhausted, and avoiding accidents caused by the unstable oil pressure leading to uncertain working states of components such as cylinders.

[0033] It should be noted that for those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. The scope of the present utility model is defined by the claims rather than the above description.

Claims

1. A liquid level alarm device for a hydraulic system of a scraper, comprising a liquid level sensor, characterized in that: The liquid level sensor comprises a liquid level sensor S1, a liquid level sensor S2 and a liquid level sensor S3 which are arranged from top to bottom and installed in the hydraulic system oil tank; The hydraulic system liquid level alarm device of the scraper also includes a control circuit, which includes a relay KA1, a relay KA2, a relay KA3 and a time relay KT. The control circuit is also connected to a primary alarm unit ALM1, a secondary alarm unit ALM2 and an emergency execution device; The normally open contact of the liquid level sensor S1 and the coil of the relay KA1 are connected in series between the positive and negative electrodes of the power supply, and the coil of the time relay KT is connected in parallel with the coil of the relay KA1; The first normally open contact of the relay KA1 and the normally closed contact of the time relay KT are connected in series and then connected in parallel with the first normally open contact of the relay KA2, and then connected in series with the normally open contact of the liquid level sensor S2 and the coil of the relay KA2 between the positive and negative electrodes of the power supply; The second normally open contact of the relay KA1 and the first-level alarm unit ALM1 are connected in series between the positive and negative electrodes of the power supply, and the relay KA1 is used to trigger the first-level alarm unit ALM1 to alarm; The second normally open contact of the relay KA2 and the secondary alarm unit ALM2 are connected in series between the positive and negative electrodes of the power supply, and the relay KA2 is used to trigger the secondary alarm unit ALM2 to alarm; The normally open contact of the liquid level sensor S3 and the coil of the relay KA3 are connected in series between the positive and negative electrodes of the power supply; the relay KA3 is used to trigger the emergency actuator to close the oil supply pipeline of the scraper.

2. The hydraulic system liquid level alarm device for a scraper according to claim 1, characterized in that: The first-level alarm unit ALM1 is an alarm light.

3. The hydraulic system liquid level alarm device for a scraper according to claim 1, characterized in that: The secondary alarm unit ALM2 is an alarm horn.

4. The hydraulic system liquid level alarm device for a scraper according to claim 1, characterized in that: The emergency execution device is a solenoid valve installed on the oil supply pipeline of the scraper, and the electromagnet YA of the solenoid valve and the normally open contact of the relay KA3 are connected in series between the positive and negative electrodes of the power supply.

5. The hydraulic system liquid level alarm device for a scraper according to any one of claims 1 to 4, characterized in that: The liquid level sensor S1 is installed at 40% of the full liquid level of the oil tank, the liquid level sensor S2 is installed at 30% of the full liquid level of the oil tank, and the liquid level sensor S3 is installed at 10% of the full liquid level of the oil tank.

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