Coal seam thickness detection device of coal mill

Abstract

The utility model discloses a coal seam thickness detection device of a coal mill, and relates to the technical field of coal seam thickness detection of the coal mill, the coal seam thickness detection device of the coal mill comprises a loading pressure frame, the bottom end of the loading pressure frame is provided with three pull rod loading devices, the bottom end of each pull rod loading device is fixedly provided with a loading oil cylinder matched with the pull rod loading device; according to the coal seam thickness detection device of the coal mill, the ultrasonic detection mechanism and the measuring scale are distributed on the two sides of the customized pull rod loading device, and the thickness of a coal seam in the coal mill can be measured by detecting the movement displacement of the pull rod loading device, so that the coal seam thickness detection device can be conveniently mastered by a watch keeper; and meanwhile, a proximity switch easy to fail is not adopted, but the ultrasonic distance measuring sensor with long service life is adopted, so that the subsequent maintenance cost can be effectively reduced, and the coal mill can operate better, more safely and stably.

Description

Technical Field

[0001] The utility model relates to the technical field of coal seam thickness detection of coal mills, and particularly relates to a coal seam thickness detection device for coal mills. Background Technique

[0002] The medium-speed roller coal mill is a common coal powder preparation device, mainly used in fields such as coal-fired power plants. It improves the fineness and uniformity of coal powder by grinding coal powder for better combustion.

[0003] Most traditional medium-speed roller coal mill position measurements use proximity switches to collect two signals of the grinding roller descending in place and ascending in place, and cannot detect the real-time position of the grinding roller (the operator on duty cannot understand the coal seam thickness of each coal mill, and thus cannot allocate coal volume and air volume more scientifically, nor can they avoid the phenomenon of coal mill blockage by understanding the coal seam thickness). At the same time, due to the congenital problems of proximity switches, proximity switches are often damaged during use, which not only generates relatively high maintenance costs, but also poses a threat to the safe and stable operation of coal mills. Content of the Utility Model

[0004] The utility model provides a coal seam thickness detection device for a coal mill, which has the advantage of detecting the coal seam thickness to solve the problems put forward in the background technique.

[0005] To solve the defect that the existing coal mill is not convenient for detecting the coal seam thickness, the utility model provides the following technical solution: a coal seam thickness detection device for a coal mill, including a loading pressure frame, three tie-rod loading devices are installed at the bottom end of the loading pressure frame, and a loading oil cylinder matching with each tie-rod loading device is fixedly installed at the bottom end of each tie-rod loading device. Three pairs of hinge shaft devices are fixedly installed at the bottom end of the loading pressure frame, and a grinding roller device matching with each pair of hinge shaft devices is installed at the bottom end of each pair of hinge shaft devices. A measuring scale and an ultrasonic ranging mechanism are respectively arranged on both sides of one of the tie-rod loading devices.

[0006] As a preferred technical solution of the utility model, the tie-rod loading device includes an upper tie-rod, a lower tie-rod is integrally connected to the bottom end of the upper tie-rod, and an indicating plate matching with the lower tie-rod is sleeved on the lower tie-rod.

[0007] As a preferred technical solution of the utility model, the indicating plate is fixedly connected to the lower tie-rod by screws, the upper end of the upper tie-rod is rotationally connected to the loading pressure frame through a thrust spherical bearing, and the bottom end of the lower tie-rod is fixedly connected to the output end of the loading oil cylinder by screws.

[0008] As a preferred technical solution of the utility model, the measuring scale includes a measuring scale body, and a pair of first mounting brackets are welded to the side end of the measuring scale body.

[0009] As a preferred technical solution of the present utility model, after the coal mill clears the coal seam, the zero scale line on the measuring scale body is aligned with the indicating plate, and the distance between the indicating plate and the measuring scale body is 10 mm.

[0010] As a preferred technical solution of the present utility model, the ultrasonic ranging mechanism includes a second mounting bracket, a rubber gasket is fixedly connected to the side wall of the second mounting bracket by glue, and an ultrasonic ranging sensor is installed on the side wall of the rubber gasket by screws.

[0011] As a preferred technical solution of the present utility model, the ultrasonic ranging sensor uses a 15 cm range, and the maximum displacement of the roller device is 10 cm.

[0012] Compared with the prior art, the present utility model provides a coal seam thickness detection device for a coal mill, which has the following beneficial effects:

[0013] 1. For this coal seam thickness detection device of the coal mill, since the up and down displacements of the tie rod loading device are exactly the same as those of the roller device, the position of the tie rod loading device can indirectly measure the position of the roller device. The ultrasonic detection mechanism and the measuring scale are distributed on both sides of the customized tie rod loading device. By detecting the moving displacement of the tie rod loading device (such as the moving displacement of the indicating plate), the thickness of the coal seam in the coal mill can be measured. The 4-20 ma current signal generated by the ultrasonic ranging sensor can be converted into a digital signal through a 4-20 ma analog input card and sent to the DCS. This signal represents the thickness of the coal bed on the coal mill grinding table and can be monitored by the operator on duty.

[0014] 2. For this coal seam thickness detection device of the coal mill, since the thickness of the coal seam can be detected in real time, it is convenient for the operator on duty to scientifically allocate the coal quantity and air volume, and can also avoid the occurrence of grinding blockage. At the same time, since a proximity switch prone to failure is not used, but an ultrasonic ranging sensor with a high service life is used, the subsequent maintenance cost can be effectively reduced, and the coal mill can operate more stably and safely. Description of the Drawings

[0015] Figure 1 It is a simple principle structure diagram of the roller device loading of the present utility model;

[0016] Figure 2 It is a structure diagram of the tie rod loading device in the present utility model;

[0017] Figure 3 It is an installation distribution diagram of the measuring scale and the ultrasonic ranging mechanism of the present utility model.

[0018] In the figure: 10, loading pressure frame; 20, tie rod loading device; 21, upper tie rod; 22, lower tie rod; 23, indicator plate; 30, loading oil cylinder; 40, hinge shaft device; 50, grinding roller device; 60, measuring scale; 61, measuring scale body; 62, first mounting bracket; 70, ultrasonic ranging mechanism; 71, second mounting bracket; 72, rubber gasket; 73, ultrasonic ranging sensor. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figures 1 - 3 , the present invention discloses a coal seam thickness detection device for a coal mill, including a loading pressure frame 10. Three tie rod loading devices 20 are installed at the bottom end of the loading pressure frame 10. The bottom end of each tie rod loading device 20 is fixedly installed with a loading oil cylinder 30 matching it. Three pairs of hinge shaft devices 40 are fixedly installed at the bottom end of the loading pressure frame 10. The bottom end of each pair of hinge shaft devices 40 is installed with a grinding roller device 50 matching it. A measuring scale 60 and an ultrasonic ranging mechanism 70 are respectively arranged on both sides of one of the tie rod loading devices 20.

[0021] Specifically, the tie rod loading device 20 includes an upper tie rod 21. The bottom end of the upper tie rod 21 is integrally connected with a lower tie rod 22. The lower tie rod 22 is sleeved with an indicator plate 23 matching it. The indicator plate 23 is fixedly connected with the lower tie rod 22 by screws. The indicator plate 23 is of a disc structure and is provided with a chamfer. The upper end of the upper tie rod 21 is rotationally connected with the loading pressure frame 10 through a thrust joint bearing. The bottom end of the lower tie rod 22 is fixedly connected with the output end of the loading oil cylinder 30 by screws.

[0022] In this implementation manner, since the grinding roller device 50 is installed below the loading pressure frame 10 through the hinge shaft device 40, and the entire tie rod loading device 20 is installed below the loading pressure frame 10, at this time, the up and down displacements of the tie rod loading device 20 and the up and down displacements of the grinding roller device 50 are exactly the same. And the up and down displacement of the tie rod loading device 20 is the thickness of the ash layer. By detecting the displacement of the tie rod loading device 20, the thickness of the coal seam can be detected.

[0023] Specifically, the measuring scale 60 includes a measuring scale body 61. A pair of first mounting brackets 62 are welded to the side ends of the measuring scale body 61. After the coal bed of the coal mill is cleaned, the zero scale line on the measuring scale body 61 is aligned with the indicator plate 23, and the distance between the indicator plate 23 and the measuring scale body 61 is 10 mm.

[0024] In this embodiment, the first mounting bracket 62 can be mounted on the outer wall of the housing of the coal mill. When the thickness of the coal bed is zero, the zero scale line on the measuring scale body 61 is aligned with the indicator plate 23. Since the indicator plate 23 is fixedly mounted on the lower pull rod 22, as the lower pull rod 22 moves upward, the indicator plate 23 moves upward accordingly. By observing the position of the indicator plate 23 on the measuring scale body 61, it is convenient for relevant staff to approach the coal mill to directly determine the thickness of the coal bed (which can be used in special cases, such as when the ultrasonic distance measuring sensor 73 fails or the ultrasonic distance measuring sensor 73 has not been installed yet).

[0025] Specifically, the ultrasonic distance measuring mechanism 70 includes a second mounting bracket 71. A rubber gasket 72 is fixedly connected to the side wall of the second mounting bracket 71 by glue. An ultrasonic distance measuring sensor 73 is installed on the side wall of the rubber gasket 72 by screws. The ultrasonic distance measuring sensor 73 has a measurement range of 15 cm, and the maximum displacement of the grinding roller device 50 is 10 cm.

[0026] In this embodiment, the second mounting bracket 71 can be mounted on the outer wall of the housing of the coal mill. The setting of the rubber gasket 72 can improve the buffering performance after the installation of the ultrasonic distance measuring sensor 73 and enhance the safety of the ultrasonic distance measuring sensor 73. The ultrasonic distance measuring sensor 73 is an industrial ultrasonic displacement sensor with the model HC - SR04HC - SR04. When in use, the ultrasonic distance measuring sensor 73 can be connected to a 4 - 20 mA analog input card. The displacement of the pull rod loading device 20 is converted into a 4 - 20 mA current signal by the ultrasonic distance measuring sensor 73. The 4 - 20 mA current signal generated by the ultrasonic distance measuring sensor 73 is converted into a digital signal through the 4 - 20 mA analog input card and sent to the DCS. This signal represents the thickness of the coal bed in the coal mill and can be monitored by the operator on duty.

[0027] It should be noted that in this article, terms such as "including", "comprising" or any other variants thereof are intended to cover non - exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. Without further limitations, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0028] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A coal seam thickness detection device for a coal mill, characterized in that: It includes a loading pressure frame (10). Three pull-rod loading devices (20) are installed at the bottom end of the loading pressure frame (10). A loading oil cylinder (30) matching each pull-rod loading device (20) is fixedly installed at the bottom end of each pull-rod loading device (20). Three pairs of hinge shaft devices (40) are fixedly installed at the bottom end of the loading pressure frame (10). A grinding roller device (50) matching each pair of hinge shaft devices (40) is installed at the bottom end of each pair of hinge shaft devices (40). A measuring scale (60) and an ultrasonic ranging mechanism (70) are respectively arranged on both sides of one of the pull-rod loading devices (20).

2. The coal seam thickness detection device of the coal mill according to claim 1, characterized in that: The pull-rod loading device (20) includes an upper pull-rod (21). A lower pull-rod (22) is integrally connected to the bottom end of the upper pull-rod (21). An indicating plate (23) matching the lower pull-rod (22) is sleeved on the lower pull-rod (22).

3. The coal seam thickness detection device for a coal mill according to claim 2, characterized in that: The indicating plate (23) is fixedly connected to the lower pull-rod (22) by screws. The upper end of the upper pull-rod (21) is rotatably connected to the loading pressure frame (10) through a thrust spherical bearing. The bottom end of the lower pull-rod (22) is fixedly connected to the output end of the loading oil cylinder (30) by screws.

4. The coal seam thickness detection device for the coal mill according to claim 3, characterized in that: The measuring scale (60) includes a measuring scale body (61). A pair of first mounting brackets (62) are welded to the side end of the measuring scale body (61).

5. The coal seam thickness detection device of the coal mill according to claim 4, characterized in that: After the coal mill clears the coal seam, the zero scale line on the measuring scale body (61) is aligned with the indicating plate (23), and the distance between the indicating plate (23) and the measuring scale body (61) is 10 mm.

6. The coal seam thickness detection device of the coal mill according to claim 1, characterized in that: The ultrasonic ranging mechanism (70) includes a second mounting bracket (71). A rubber gasket (72) is fixedly connected to the side wall of the second mounting bracket (71) by glue. An ultrasonic ranging sensor (73) is installed on the side wall of the rubber gasket (72) by screws.

7. The coal seam thickness detection device for a coal mill according to claim 6, characterized in that: The ultrasonic ranging sensor (73) uses a 15-cm measuring range, and the maximum displacement of the grinding roller device (50) is 10 cm.

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