A device and method for monitoring the internal shape of a vertical mill

Abstract

The present invention relates to the field of grinding technology, and in particular to a device and method for monitoring the internal morphology of a vertical mill, which aims to solve the problem of inaccurate measurement in existing monitoring methods. The device for monitoring the internal morphology of a vertical mill provided by the present invention comprises a mounting shell and a sensor, wherein the sensor is mounted on the mounting shell and arranged above the grinding disc, and is used to measure the distance to the material layer. The device for monitoring the internal morphology of a vertical mill provided by the present invention directly measures the thickness of the material layer by installing the sensor inside the vertical mill, which is more accurate and direct than the existing indirect measurement method, and avoids the inaccurate measurement caused by the shaking of the hydraulic cylinder, the wear of the roller sleeve, and the like.

Description

Technical Field

[0001] The invention relates to the technical field of grinding, and in particular to a device and method for monitoring the internal morphology of a vertical mill. Background Art

[0002] The existing vertical mill uses a hydraulic cylinder stroke sensor to monitor the thickness of the material in the mill. Inside the vertical mill, the grinding roller is fixed on the rocker arm, and a bearing is arranged inside the grinding roller so that the grinding roller can rotate around the axis. The hydraulic cylinder applies a pulling force obliquely downward to make the rocker arm rotate around the rocker arm axis, so that the rocker arm drives the grinding roller to swing to apply downward force.

[0003] At the same time, the material falls from the cone bucket onto the grinding disc. The motor at the bottom of the grinding disc drives the grinding disc to rotate through the reducer. The material spreads around under the action of centrifugal force, and finally spreads to the space between the grinding roller and the grinding disc, where it is ground into qualified products and taken out of the vertical mill by high-pressure gas.

[0004] The existing material thickness monitoring principle is to install a distance sensor at the hydraulic cylinder, and determine the height of the grinding roller by measuring the distance moved by the hydraulic cylinder rod end through algorithm conversion, and then calculate the thickness of the material between the grinding roller and the grinding disc.

[0005] Frequent shaking of the hydraulic cylinder during operation may cause the sensor to loosen and the outer roller sleeve of the grinding roller to wear, which may lead to inaccurate monitoring of the material thickness inside the mill and affect the operator's judgment. Summary of the invention

[0006] The object of the present invention is to provide a device and method for monitoring the internal shape of a vertical mill, so as to solve the problem of inaccurate measurement in existing monitoring methods.

[0007] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0008] A vertical mill internal morphology monitoring device comprises a mounting shell and a sensor. The sensor is mounted on the mounting shell and arranged above the grinding disc for measuring the distance to the material layer.

[0009] Furthermore, a monitoring hole is provided on the mounting shell, and the sensor is arranged above the monitoring hole;

[0010] Air is blown into the installation shell, and the gas flows out from the monitoring hole.

[0011] Furthermore, the vertical mill internal morphology monitoring device also includes a fan, which is connected to the installation shell and is used to blow air into the installation shell.

[0012] Furthermore, the fan is an air compressor or a sealed fan.

[0013] Furthermore, the vertical mill internal morphology monitoring device also includes a protective shell, and the protective shell is sleeved on the sensor.

[0014] Furthermore, the vertical mill internal morphology monitoring device further includes a protective mirror, which is connected to the protective shell and is arranged below the sensor;

[0015] One end of the protective shell is connected to the protective mirror, and the other end is connected to the protective shell, and together with the protective mirror and the mounting shell, a protective cavity is formed, and the sensor is mounted in the protective cavity.

[0016] Furthermore, a mounting plate is provided in the mounting shell, and the protective shell is mounted on the mounting plate.

[0017] Furthermore, the mounting plate divides the inner cavity of the mounting shell into a cooling pipe and a protection pipe, gas is blown into one end of the cooling pipe, and the other end is connected to the protection pipe;

[0018] The monitoring hole is communicated with the protection pipe, and the sensor is installed on the cooling pipe.

[0019] Furthermore, the vertical mill internal morphology monitoring device also includes a wear-resistant plate, and the wear-resistant plate is arranged on the outside of the mounting shell.

[0020] Another aspect of the present invention provides a method for monitoring the internal morphology of a vertical mill, which uses the above-mentioned vertical mill internal morphology monitoring device, wherein the vertical mill internal morphology monitoring device includes a plurality of the above-mentioned sensors, and draws a monitoring curve graph of the instantaneous morphology of the material in the mill according to the measurement data of the plurality of the above-mentioned sensors at the same time, and draws a monitoring surface graph of the instantaneous morphology of the material in the mill according to the measurement data of the plurality of the above-mentioned sensors at different times.

[0021] Based on the above technical solutions, the technical effects that can be achieved by the present invention are:

[0022] The internal morphology monitoring device of a vertical mill provided by the present invention comprises a mounting shell and a sensor. The sensor is mounted on the mounting shell and arranged above the grinding disc, and is used to measure the distance to the material layer.

[0023] The vertical mill internal morphology monitoring device provided by the present invention directly measures the material layer thickness by installing a sensor inside the vertical mill. Compared with the existing indirect measurement method, it is more accurate and direct, and avoids inaccurate measurement caused by hydraulic cylinder shaking, roller sleeve wear, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the structure of a vertical mill internal morphology monitoring device provided by an embodiment of the present invention;

[0026] Figure 2 A three-dimensional diagram of a vertical mill internal morphology monitoring device provided by an embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of the protection structure of the sensor;

[0028] Figure 4 This is a schematic diagram of the material layer thickness monitoring structure of the existing vertical mill;

[0029] Figure 5 This is a schematic diagram of the layout of the internal monitoring device of the vertical mill;

[0030] Figure 6 It is the monitoring curve of the instantaneous shape of the material in the mill;

[0031] Figure 7 This is a surface diagram for monitoring the instantaneous shape of materials in the mill.

[0032] Icons: 100, installation shell; 110, installation plate; 101, monitoring hole; 102, cooling pipe; 103, protection pipe; 200, sensor; 300, protection shell; 400, protection mirror; 500, wear-resistant plate;

[0033] 10. Grinding roller; 20. Rocker arm; 30. Rocker arm shaft; 40. Hydraulic cylinder; 50. Cone bucket; 60. Grinding disc; 70. Distance sensor. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0035] The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed but is merely representative of selected embodiments of the present invention.

[0037] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0038] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0039] In the absence of conflict, the following embodiments and features of the embodiments may be combined with each other.

[0040] The existing material thickness monitoring principle is to install a distance sensor at the hydraulic cylinder, and determine the height of the grinding roller by measuring the distance moved by the hydraulic cylinder rod end through algorithm conversion, and then calculate the thickness of the material between the grinding roller and the grinding disc.

[0041] Frequent shaking of the hydraulic cylinder during operation may cause the sensor to loosen and the outer roller sleeve of the grinding roller to wear, which may lead to inaccurate monitoring of the material thickness inside the mill and affect the operator's judgment.

[0042] In view of this, the present invention provides a device for monitoring the internal morphology of a vertical mill, including a mounting shell 100 and a sensor 200. The sensor 200 is mounted on the mounting shell 100 and disposed above the grinding disc 60 for measuring the distance to the material layer.

[0043] The vertical mill internal morphology monitoring device provided by the present invention directly measures the material layer thickness by installing the sensor 200 inside the vertical mill. Compared with the existing indirect measurement method, it is more accurate and direct, and avoids inaccurate measurement caused by shaking of the hydraulic cylinder 40, wear of the roller sleeve, etc.

[0044] The following combination Figure 1-Figure 7 The structure and shape of the vertical mill internal morphology monitoring device provided in this embodiment are described in detail:

[0045] Existing monitoring methods measure the thickness of the material layer indirectly, such as Figure 4As shown, during operation, the cone bucket 50 replenishes materials into the grinding disc 60, the grinding disc 60 is driven by the motor to rotate around its own axis, the grinding roller 10 is connected to the rocker arm 20 and can rotate around its own axis, the axis of the rocker arm shaft 30 is horizontal, the rocker arm 20 is hinged to the rocker arm shaft 30, and the extended end of the hydraulic cylinder 40 is hinged to the rocker arm 20. The contraction of the hydraulic cylinder 40 can drive the rocker arm 20 to swing and drive the grinding roller 10 to swing downward, so that the grinding roller 10 and the grinding disc 60 cooperate to grind the materials. Specifically, a distance sensor 70 is installed on the cylinder body of the hydraulic cylinder 40, and a sensing plate is provided at the extended end of the hydraulic cylinder 40 to cooperate with the distance sensor 70, so as to judge the extension distance of the hydraulic cylinder 40, and finally the height of the grinding roller 10 is calculated according to the angle and length to judge the thickness of the material layer between the grinding roller 10 and the grinding disc 60.

[0046] This indirect measurement method can only monitor the thickness of the material layer between the grinding roller 10 and the grinding disc 60, and cannot monitor the shape of the material layer at other positions on the grinding disc 60. The operator can only make fuzzy judgments based on the data fed back by the distance sensor 70, and there is little reference data.

[0047] Moreover, as the outer sleeve of the grinding roller 10 wears, the value of the material layer monitoring will be greatly different from the initial set value, which will also affect the operator's operational judgment.

[0048] In addition, the hydraulic cylinder 40 will shake frequently during operation, which may easily loosen the installed distance sensor 70, resulting in inaccurate monitoring of the thickness of the material in the mill. In subsequent production, the operator's judgment may be affected by erroneous data.

[0049] At the same time, the sensing plate corresponding to the distance sensor 70 is mostly in the form of on-site welding, and the accuracy is very low; if the sensing plate is not perpendicular to the sensor 200 during welding, the distance between the sensor 200 and the sensing plate may change nonlinearly during subsequent use, affecting the accuracy of the data.

[0050] The vertical mill internal morphology monitoring device provided in this embodiment includes a mounting housing 100, a sensor 200, a protective shell 300 and a protective mirror 400. Figure 1 , Figure 2 shown.

[0051] The installation housing 100 is provided with an installation plate 110, and the protective shell 300 is installed on the installation plate 110. The installation plate 110 divides the inner cavity of the installation housing 100 into a cooling pipe 102 and a protective pipe 103. Gas is blown into one end of the cooling pipe 102, and the other end is connected to the protective pipe 103. At the same time, a monitoring hole 101 is opened on the installation housing 100, and the monitoring hole 101 is arranged below the sensor 200 and is connected to the protective pipe 103.

[0052] The protective shell 300 is mounted on the sensor 200, and the protective mirror 400 is connected to the protective shell 300 and arranged below the sensor 200; one end of the protective shell 300 is connected to the protective mirror 400, and the other end is connected to the protective shell 300, and together with the protective mirror 400 and the mounting shell 100, a protective cavity is formed, and the sensor 200 is installed in the protective cavity. Figure 3 shown.

[0053] Specifically, the sensor 200 is installed in the cooling pipe 102 , one end of the protective shell 300 is connected to the inner wall of the cooling pipe 102 , and the other end is inserted into the mounting plate 110 ; the protective mirror 400 is inserted into the protective shell 300 and bonded to the protective shell 300 .

[0054] In this embodiment, the sensor 200 may be a laser distance measuring sensor, an ultrasonic distance measuring sensor, or the like.

[0055] In order to conduct comprehensive monitoring, multiple sensors can be set up as needed to monitor different locations and objects.

[0056] In this embodiment, the vertical mill internal morphology monitoring device also includes a fan, which is connected to the mounting shell 100 and is used to blow high-pressure air into the cooling pipe 102. The high-pressure air flows through the protective shell 300 to cool the sensor 200 to prevent the temperature of the sensor 200 from being too high and affecting the accuracy of monitoring.

[0057] The high-pressure air then enters the protection pipe 103 and is blown out from the monitoring hole 101 .

[0058] Specifically, the fan is an air compressor or a sealed fan.

[0059] In this embodiment, the vertical mill internal morphology monitoring device also includes a wear-resistant plate 500, which is arranged outside the mounting shell 100 to protect the mounting shell 100, prevent the mounting shell 100 from being eroded by high-speed materials in the mill, and improve the life of the mounting shell 100.

[0060] Specifically, the two wear-resistant plates 500 are respectively arranged on both sides along the length direction of the mounting shell 100, such as Figure 2 , Figure 3 shown.

[0061] Since the wind blowing upward from below is circumferential, that is, the wind rotates around the axis of the grinding disc 60, it mainly impacts the side of the mounting shell 100, so the position of the wear-resistant plate 500 is set.

[0062] For comprehensive protection, wear-resistant plates may be provided on all outer sides of the mounting housing 100 .

[0063] In an optional solution of this embodiment, the wear-resistant plate 500 may be made of nylon plate, high manganese steel, or silicon carbide ceramics, and a wear-resistant coating is provided on the surface of the wear-resistant plate 500.

[0064] The wear-resistant coating can be processed by electroplating, spraying, physical deposition, chemical deposition, etc., and the coating material can be selected from chromium nitride, silicon carbide, etc.

[0065] The internal temperature of the vertical mill is relatively high, generally around 60°C for cement mills. At the same time, the high-speed dust environment inside the mill is not conducive to the normal operation of electronic components.

[0066] The device for monitoring the internal morphology of a vertical mill provided in this embodiment fully considers these two points. A fan outside the mill is used to draw high-pressure air into the cooling pipe 102 to cool the ambient temperature around the sensor 200. The sensor 200 is protected by a protective shell 300 and a protective mirror 400. After passing through the sensor 200, the high-pressure air enters the protective pipe 103 and flows out from the monitoring hole 101 to perform air jets into the mill, thereby preventing high-speed dust in the mill from entering the mounting shell 100 to cause wear and affect monitoring.

[0067] At the same time, the signal of the sensor 200 can effectively pass through the protective mirror 400 and the monitoring hole 101 to perform measurement work.

[0068] The vertical mill internal morphology monitoring device provided in this embodiment is arranged inside the vertical mill, located directly above the grinding disc 60 and parallel to the lining plate of the grinding disc 60. The specific arrangement above the material layer is as follows: Figure 5 As shown, the sensor distance decreases in the direction away from the center of the grinding disc 60.

[0069] This device can also be placed in the area containing the grinding roller 10 to perform relevant monitoring of the grinding roller 10, including real-time monitoring of the thickness of the material layer under the roller and the wear of the roller sleeve.

[0070] When the sensor 200 is installed in the area without grinding rollers, the shape change of the material layer on the grinding disc 60 can be fed back in real time through the sensor 200. The central control computer of the mill can obtain the data of the sensor 200 and draw the shape curve of the material layer according to the data to intuitively express the shape change of the material layer, such as Figure 6 shown.

[0071] When the sensor 200 is installed in the grinding roller area, it can provide feedback on the shape of the material between the grinding roller 10 and the grinding disc 60, and can also monitor the wear of the roller sleeve. At this time, the central control computer can obtain the data of the sensor 200 and draw a curve to intuitively express the shape curve of the discharge layer or the changes in the grinding roller 10, thereby realizing multiple monitoring of the material in the mill and the grinding roller 10.

[0072] As time goes by, the morphological curve can be synthesized by software to form a continuous surface graph, which is convenient for operators to observe the operation of the mill more accurately, such as Figure 7 shown.

[0073] When multiple vertical mill internal morphology monitoring devices are jointly monitoring, the material layer surface diagram can monitor and display the morphology of all material layers and grinding rollers 10 on the entire grinding disc 60 in real time, and provide real-time feedback on the overall morphology of the internal working of the mill, making it convenient for operators to more accurately judge the internal operating conditions of the mill, thereby adjusting the mill parameters more timely to achieve better operating results.

[0074] In the optional solution provided in this embodiment, the sensors 200 are arranged in a straight line along the radial direction of the grinding disc 60, and the spacing between the sensors 200 is set as required.

[0075] Optionally, the sensors 200 may be arranged in a sector shape or a circle to cover a sector-shaped area or the entire grinding disc 60 area.

[0076] The vertical mill internal morphology monitoring device provided in this embodiment is fixed on the mill housing, that is, the mounting housing 100 is connected to the mill housing. Compared with the monitoring device fixed on the hydraulic cylinder 40, it is more stable and reliable, and the monitoring data is more stable.

[0077] Moreover, it can simultaneously monitor the shape of the material inside the entire mill and the grinding roller 10, rather than being limited to the material between the grinding roller 10 and the grinding disc 60. Compared with the original monitoring device that can only monitor the material between the grinding roller 10 and the grinding disc 60, the monitoring range is more comprehensive, and can provide real-time feedback on the shape of the material on the grinding disc 60 without causing data deviation due to the wear of the grinding roller 10, so the data generation is more accurate.

[0078] In addition, there is a 3D radar level scanner on the top of the cement warehouse or silo, which is suitable for high-concentration dust environments. It can generate 3D images and provide real-time feedback on the height shape of the materials inside the cement warehouse or silo. However, this equipment is not suitable for the inside of a vertical mill because there is high temperature and high-speed material flushing inside the vertical mill.

[0079] At the same time, this device is large in size and difficult to monitor if protective measures are installed.

[0080] Based on the vertical mill internal morphology monitoring device provided in this embodiment, a vertical mill internal morphology monitoring method is proposed, using the above-mentioned vertical mill internal morphology monitoring device, the vertical mill internal morphology monitoring device includes multiple sensors 200, and a monitoring curve graph of the instantaneous morphology of the material in the mill is drawn according to the measurement data of the multiple sensors 200 at the same time, and a monitoring surface graph of the instantaneous morphology of the material in the mill is drawn according to the measurement data of the multiple sensors 200 at different times.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for monitoring the internal shape of a vertical mill, characterized in that: It comprises a mounting housing (100) and a sensor (200), wherein the sensor (200) is mounted on the mounting housing (100) and arranged above the grinding disc (60) and is used to measure the distance to the material layer; The mounting housing (100) is provided with a monitoring hole (101), and the sensor (200) is arranged above the monitoring hole (101); Blowing air into the installation shell (100), so that the gas flows out from the monitoring hole (101) to perform air jetting into the mill; Also included is a fan, the fan being in communication with the installation housing (100) and being used for blowing air into the installation housing (100); The inner cavity of the installation shell (100) is divided into a cooling pipe (102) and a protective pipe (103); gas is blown into one end of the cooling pipe (102), and the other end is connected to the protective pipe (103); The monitoring hole (101) is in communication with the protection pipe (103), and the sensor (200) is installed on the cooling pipe (102).

2. The device for monitoring the internal shape of a vertical mill according to claim 1, characterized in that: The fan is an air compressor or a sealed fan.

3. The device for monitoring the internal shape of a vertical mill according to claim 1, characterized in that: It also includes a protective shell (300), wherein the protective shell (300) is sleeved on the sensor (200).

4. The device for monitoring the internal shape of a vertical mill according to claim 3, characterized in that: Also included is a protective mirror (400), the protective mirror (400) being connected to the protective shell (300) and arranged below the sensor (200); One end of the protective shell (300) is connected to the protective mirror (400), and the other end is connected to the protective shell (300), and together with the protective mirror (400) and the mounting shell (100) form a protective cavity, and the sensor (200) is mounted in the protective cavity.

5. The device for monitoring the internal shape of a vertical mill according to claim 4, characterized in that: A mounting plate (110) is provided in the mounting housing (100), and the protective shell (300) is mounted on the mounting plate (110); The mounting plate (110) divides the inner cavity of the mounting housing (100) into the cooling pipe (102) and the protection pipe (103).

6. The device for monitoring the internal shape of a vertical mill according to claim 5, characterized in that: It also includes a wear-resistant plate (500), wherein the wear-resistant plate (500) is arranged outside the mounting shell (100).

7. A method for monitoring the internal morphology of a vertical mill, using the device for monitoring the internal morphology of a vertical mill as claimed in any one of claims 1 to 6, characterized in that: The vertical mill internal morphology monitoring device comprises a plurality of the sensors (200), and draws a monitoring curve diagram of the instantaneous morphology of the material in the mill based on the measurement data of the plurality of sensors (200) at the same time, and draws a monitoring surface diagram of the instantaneous morphology of the material in the mill based on the measurement data of the plurality of sensors (200) at different times.

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