Device capable of automatically adjusting laser focal length according to height of belt coal seam

Abstract

The utility model provides a device capable of automatically adjusting the laser focal length according to the height of a belt coal seam. The device capable of automatically adjusting the laser focal length according to the belt coal seam height comprises a belt conveyor, a coal seam height sensor is arranged at the top of the belt conveyor and connected with a PLC, an electric sliding table module is arranged on one side of the coal seam height sensor, a laser probe is arranged on the electric sliding table module, and the laser probe is connected with the PLC. The electric sliding table module and the laser probe are both connected with the PLC; the coal seam height sensor is used for measuring a coal seam surface contour line of a coal seam conveyed by the belt conveyor; the electric sliding table module is located on the side, away from the conveying inlet of the belt conveyor, of the coal seam height sensor. The device capable of automatically adjusting the laser focal length according to the height of the belt coal seam has the advantages that laser focusing can be automatically adjusted according to the height of coal flow, and the efficiency of exciting a plasma spectrum can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal preparation, in particular to a device which can automatically adjust the laser focal length according to the height of a belt coal seam. Background Art

[0002] In the intelligent construction of coal preparation plants, in order to master the production process and the quality of the final product, it is necessary to test the coal ash content at multiple stages. Among the emerging technologies for online ash content measurement, a full-component measurement technology based on laser-induced plasma uses laser to irradiate the surface of coal and focus on the surface of coal to form a high-heat and high-energy point domain, thereby exciting a plasma spectrum, and measuring the spectrum to obtain the required coal quality data.

[0003] In the prior art, when the laser-induced plasma full-component measurement technology is used to measure the ash content of coal online, the laser probe is usually installed on the clean coal belt conveyor with a support structure, and the laser is directly projected onto the surface of the coal. However, due to the complexity of the coal washing process, the coal flow transported by the belt conveyor is often unstable, and the height of the coal flow changes randomly over time. The laser focal length is often fixed and unchanged. When the laser probe is fixed, it cannot be guaranteed that the laser focus is focused on the surface of the coal, and the plasma spectrum on the coal surface cannot be effectively excited. The effective spectrum in this case is generally less than 5%. In this case, a device is needed to achieve real-time focusing on the coal flow surface.

[0004] Therefore, it is necessary to provide a new device that can automatically adjust the laser focal length according to the belt coal seam height to solve the above technical problems. Utility Model Content

[0005] The technical problem solved by the utility model is to provide a device which can automatically adjust the laser focus according to the height of the coal flow, can improve the efficiency of exciting the plasma spectrum and can automatically adjust the laser focal length according to the height of the belt coal seam.

[0006] In order to solve the above technical problems, the utility model provides a device that can automatically adjust the laser focal length according to the belt coal seam height, including: a belt conveyor, a coal seam height sensor is provided on the top of the belt conveyor, the coal seam height sensor is connected to a PLC controller, an electric slide module is provided on one side of the coal seam height sensor, a laser probe is provided on the electric slide module, and the electric slide module and the laser probe are both connected to the PLC controller.

[0007] Preferably, the coal seam height sensor is used to measure the surface contour of the coal seam transmitted by the belt conveyor.

[0008] Preferably, the electric slide module is located on the side of the coal seam height sensor away from the conveying inlet of the belt conveyor.

[0009] Compared with the related art, the device provided by the utility model which can automatically adjust the laser focal length according to the belt coal seam height has the following beneficial effects:

[0010] The utility model provides a device which can automatically adjust the laser focal length according to the height of the coal seam on the belt, which can solve the problem that the laser focal length cannot be focused when the coal flow is unstable; provides a method for automatically adjusting the laser focal length when the coal flow is unstable; provides a method for obtaining the coal flow height online on the belt; provides a method for protecting the laser when there is no coal; provides a relationship function between the laser probe height and the coal seam height; and can improve the efficiency of exciting the plasma spectrum. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The utility model is a schematic structural diagram of a preferred embodiment of the device capable of automatically adjusting the laser focal length according to the belt coal seam height.

[0012] Numbers in the figure: 1. Belt conveyor, 2. Coal seam surface contour line, 3. Coal seam height sensor, 4. PLC controller, 5. Electric slide module, 6. Laser probe. DETAILED DESCRIPTION

[0013] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0014] Please refer to Figure 1 ,in, Figure 1 A schematic diagram of a preferred embodiment of a device for automatically adjusting the laser focal length according to the belt coal seam height provided by the utility model. The device for automatically adjusting the laser focal length according to the belt coal seam height comprises: a belt conveyor 1, the belt conveyor 1 is used to transport coal, a coal seam height sensor 3 is provided on the top of the belt conveyor 1, the coal seam height sensor is connected to a PLC controller 4, the PLC controller 4 can remotely obtain the signal of the coal seam height sensor 3, and can control the electric slide module 5 to adjust the slider height, an electric slide module 5 is provided on one side of the coal seam height sensor 3, the electric slide module 5 is used to control the up and down movement of the laser probe 6, and may include a motor, a linear module, a slide base, and a slider, the slider can move up and down according to the control signal, the electric slide module 5 is provided with a laser probe 6, the laser probe 6 is fixedly mounted on the slider, so that the laser probe 6 can be moved up and down according to the movement of the slider, so as to achieve the focusing of the laser probe 6, and the electric slide module 5 and the laser probe 6 are both connected to the PLC controller 4.

[0015] The coal seam height sensor 3 is used to measure the coal seam surface contour line 2 transmitted by the belt conveyor 1 .

[0016] The electric slide module 5 is located on a side of the coal seam height sensor 3 away from the conveying inlet of the belt conveyor 1 .

[0017] The working principle of the device provided by the utility model that can automatically adjust the laser focal length according to the belt coal seam height is as follows:

[0018] When the belt conveyor 1 is in an empty coal state, the coal seam height sensor 3 obtains the belt distance L0. When coal passes under the coal seam height sensor 3, the distance L1 between the sensor and the coal seam surface is obtained, and the coal seam height is h=L0-L1.

[0019] After the start, the upper belt of the belt conveyor (1) carries the coal flow from left to right, with a moving speed of v. At time t, point A on the coal flow passes directly below the coal seam height sensor 3. The coal seam height sensor 3 obtains the coal seam height data h of point A and transmits the height data to the PLC controller 4. It is known that the horizontal distance between the coal seam height sensor 3 and the laser probe 6 is S. The coal flow continues to move to the right. After a period of time, the PLC controller 4 controls the electric slide module 5 to raise the laser probe 6 to H. At this time, point A moves to directly below the laser probe 6. Assume that the focal length of the laser probe 6 is f. Since the coal flow height is a function of time, we have.

[0020] In the absence of coal, the PLC controller 4 can take automatic protection measures according to the received height signal, lift the laser probe 6 to the highest point, and resume tracking and automatically adjust the laser focal length when coal flows through.

[0021] Compared with the related art, the device provided by the utility model which can automatically adjust the laser focal length according to the belt coal seam height has the following beneficial effects:

[0022] The utility model provides a device which can automatically adjust the laser focal length according to the height of the coal seam on the belt, which can solve the problem that the laser focal length cannot be focused when the coal flow is unstable; provides a method for automatically adjusting the laser focal length when the coal flow is unstable; provides a method for obtaining the coal flow height online on the belt; provides a method for protecting the laser when there is no coal; provides a relationship function between the laser probe height and the coal seam height; and can improve the efficiency of exciting the plasma spectrum.

[0023] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A device that can automatically adjust the laser focal length according to the belt coal seam height, characterized in that: include: A belt conveyor, wherein a coal seam height sensor is provided on the top of the belt conveyor, wherein the coal seam height sensor is connected to a PLC controller, wherein an electric slide module is provided on one side of the coal seam height sensor, wherein a laser probe is provided on the electric slide module, and both the electric slide module and the laser probe are connected to the PLC controller.

2. The device for automatically adjusting the laser focal length according to the belt coal seam height according to claim 1 is characterized in that: The coal seam height sensor is used to measure the surface contour line of the coal seam transmitted by the belt conveyor.

3. The device capable of automatically adjusting the laser focal length according to the belt coal seam height according to claim 1 is characterized in that: The electric slide module is located on the side of the coal seam height sensor away from the conveying inlet of the belt conveyor.

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