A material-ball ratio control system and control method thereof

Abstract

The present invention relates to a material-to-ball ratio control system and a control method thereof, wherein the control system comprises: a weighing sensor, a spherical tile for supporting a hollow shaft of a cylinder body is provided with a plurality of holes, each of the holes is correspondingly inlaid with a weighing sensor, and is used to measure the weight of the rotating part of a milling system; a PLC control cabinet, wherein the signal of the weighing sensor is transmitted to the PLC control cabinet after data processing by a converter, and the PLC control cabinet compares the material-to-ball ratio obtained in real time with the optimal material-to-ball ratio preset by the system, and sends an instruction to increase or decrease the feeding amount to a feeder in the milling system. Therefore, the present invention can measure the material-to-ball ratio in real time, thereby ensuring that the steel ball mill is always operating in the optimal material-to-ball ratio state, which is of great significance to improving the milling capacity of the steel ball mill and reducing the power consumption and steel consumption of the milling.

Description

Technical Field

[0001] The invention relates to the technical field of powder making and grinding, and more particularly to a material-to-ball ratio control system and a control method thereof. Background Art

[0002] See also Figure 1 The hollow shafts 11 at both ends of the existing steel ball mill cylinder 1 are installed on the support 2 through the spherical bearings 12. The transmission system drives the large gear 3 to drive the cylinder 1 to rotate. The steel balls 4 and the milled material W in the cylinder 1 are turned over in the cylinder 1 due to the rotation of the cylinder 1. The steel balls 4 squeeze and grind the milled material W, and the milled material W is ground into powder. High power consumption and high steel consumption are the biggest disadvantages of steel ball mills. This is because part of the power is consumed when the milled material is ground into fine powder by the steel balls. In addition, the collision between steel balls and the collision between steel balls and the liner will also consume considerable power. The collision between steel balls and the collision between steel balls and the liner not only consumes power, but also increases the wear of steel balls and liner, and increases steel consumption. The inventors have found through research that the powder making capacity of the steel ball mill gradually increases with the increase of the material-to-ball ratio. After reaching the critical point, the powder making capacity gradually decreases with the increase of the material-to-ball ratio. See. Figure 2 . When the material-ball ratio in the cylinder 1 reaches the critical point, the powder making capacity is the largest, so the range on both sides of the critical point is the optimal material-ball ratio range. After experimental research, the range on both sides is preferably ±10%. For example, the critical point material-ball ratio is 0.3, and the optimal material-ball ratio range is 0.27-0.33. The specific critical point material-ball ratio is related to the material, cylinder size, and steel ball size. Assuming that the amount of steel balls in the cylinder is constant, the amount of material increases as the material-ball ratio increases, that is, the amount of material between the steel balls increases, resulting in an increase in the distance between the steel balls. Therefore, the collision between the steel balls and the collision between the steel balls and the liner gradually decreases, and the power consumption and steel consumption of powder making will be significantly reduced.

[0003] However, there is currently no device to measure the material-ball ratio in real time, and the operator can only control it based on experience. Therefore, there is a lot of room for improvement in the powder making capacity of the ball mill, and there is also a lot of room for reduction in the power consumption and steel consumption of powder making.

[0004] Therefore, how to provide a material-to-ball ratio control system and a control method thereof is a problem that those skilled in the art need to solve urgently. Summary of the invention

[0005] To this end, an object of the present invention is to provide a material-ball ratio control system.

[0006] Another object of the present invention is to provide a method for controlling the material-ball ratio.

[0007] The present invention provides a material-to-ball ratio control system for controlling the material-to-ball ratio in a cylinder of a powder making system, comprising:

[0008] A weighing sensor is provided on the spherical bushing supporting the hollow shaft of the cylinder body. A weighing sensor is correspondingly embedded in each hole to measure the weight of the rotating part of the milling system;

[0009] PLC control cabinet, the signal of the weighing sensor is transmitted to the PLC control cabinet after data processing by the converter, and the PLC control cabinet compares the real-time obtained material-ball ratio with the optimal material-ball ratio preset by the system, and sends an instruction to increase or decrease the feed amount to the feeder in the milling system.

[0010] Furthermore, the center of the hole is located on the center plane of the spherical bushing.

[0011] Furthermore, the weighing sensor comprises:

[0012] A body, the body being columnar and being fitted into the hole;

[0013] A spherical pressure head, which is located at one end of the body and arranged toward the outside of the spherical bushing, and protrudes from the outer spherical surface of the spherical bushing;

[0014] A cable is connected to the side of the body away from the spherical pressure head, and the cable is connected to the PLC control cabinet.

[0015] It can be known from the above technical scheme that compared with the prior art, the present invention discloses a material-ball ratio control system, in which a weighing sensor is embedded in the hole of a spherical tile to measure the weight of the rotating part of the powder making system, and the rotating part of the powder making system includes a cylinder, a cylinder liner, steel balls and materials; the weight is transmitted to the weighing sensor through the spherical tile, and then the weighing sensor acts on two supports respectively, and the measuring signal of the weighing sensor is processed by the converter and transmitted to the PLC control cabinet, and the PLC control cabinet compares the real-time material-ball ratio with the optimal material-ball ratio preset by the system, and sends an instruction to increase or decrease the feeding amount to the feeder in the powder making system. Therefore, the present invention can measure the material-ball ratio in real time, thereby ensuring that the steel ball mill is always operating in the optimal material-ball ratio state, which is of great significance to improving the powder making capacity of the steel ball mill and reducing the power consumption and steel consumption of powder making.

[0016] The present invention provides a material-ball ratio control method, comprising the following steps:

[0017] S1. When the steel ball is not installed, the weight of the rotating part of the coal mill measured by the weighing sensor is t1. After the steel ball is installed, the weight of the coal mill is t2. When the coal is added, the weight of the rotating part of the coal mill is t3. Therefore, the weight of the steel ball in the cylinder is t 球 =t2-t1, raw coal weight t 煤=t3-t2, real-time material-ball ratio λ=t 煤 / t 球 ;

[0018] S2, the control program in the PLC dynamically corrects t1 and t2 to ensure accurate real-time material-to-ball ratio λ;

[0019] S3. Compare the measured real-time material-to-ball ratio λ with the optimal material-to-ball ratio. According to the comparison result, the PLC sends a control signal to the feeder to increase or decrease the feeding amount, so as to control the real-time material-to-ball ratio λ in the cylinder within the optimal material-to-ball ratio range.

[0020] It can be seen from the above technical scheme that compared with the prior art, the present invention discloses a ball-to-material ratio control method, by using a weighing sensor to measure the real-time ball-to-material ratio, and comparing the measured real-time ball-to-material ratio λ with the optimal ball-to-material ratio. The PLC sends a control signal to the feeder to increase or decrease the feeding amount according to the comparison result, and the real-time ball-to-material ratio λ in the cylinder is controlled within the optimal ball-to-material ratio range, thereby improving the powder making efficiency and reducing the power consumption and steel consumption of powder making. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0022] Figure 1 The accompanying drawing is a schematic diagram of the structure of an existing steel ball mill;

[0023] Figure 2 The attached figure is a graph of milling capacity-ball ratio;

[0024] Figure 3 The accompanying drawing is a structural schematic diagram of a material-to-ball ratio control system provided by the present invention;

[0025] Figure 4 The accompanying drawing shows a longitudinal cross-sectional view of a spherical tile;

[0026] Figure 5 The accompanying drawing shows a stereogram of a spherical tile;

[0027] Figure 6 The accompanying drawing shows a perspective view of a load cell. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] See attached Figure 3-5 The present invention provides a material-to-ball ratio control system for controlling the material-to-ball ratio in a powder making system cylinder 1, comprising:

[0032] The weighing sensor 5 is used to support the spherical bearing 12 of the hollow shaft 11 of the cylinder body. A plurality of holes are provided on the spherical bearing 12. The holes can be through holes or non-through mounting holes opened on the outer spherical surface of the spherical bearing 12. Each of the holes is correspondingly inlaid with a weighing sensor 5 for measuring the weight of the rotating part of the milling system.

[0033] PLC control cabinet 6, the signal of the weighing sensor 5 is transmitted to the PLC control cabinet 6 after data processing by the converter, and the PLC control cabinet 6 compares the real-time obtained material-ball ratio with the optimal material-ball ratio preset by the system, and sends an instruction to increase or decrease the feed amount to the feeder in the milling system.

[0034] The present invention embeds a weighing sensor in the hole of a spherical tile to measure the weight of the rotating part of the powder making system, which includes a cylinder, a cylinder lining, steel balls and materials; the weight is transmitted to the weighing sensor through the spherical tile, and then the weighing sensor acts on two supports respectively. The weighing sensor measurement signal is processed by a converter and transmitted to a PLC control cabinet. The PLC control cabinet compares the real-time material-to-ball ratio with the optimal material-to-ball ratio preset by the system, and sends an instruction to increase or decrease the feeding amount to the feeder in the powder making system. Therefore, the present invention can measure the material-to-ball ratio in real time, thereby ensuring that the steel ball mill is always operating in the optimal material-to-ball ratio state, which is of great significance to improving the powder making capacity of the steel ball mill and reducing the power consumption and steel consumption of powder making.

[0035] Advantageously, the center of the hole is located on the center plane L of the spherical tile 12, that is, the centerline of the hole is on the center plane L of the spherical tile 12. Thus, the weight transmitted from the spherical tile can be accurately transmitted to the support through the weighing sensor 5, which is conducive to reducing measurement errors and improving measurement accuracy.

[0036] In one embodiment of the present invention, see the attached Figure 6 , the weighing sensor 5 comprises:

[0037] A body 51, wherein the body 51 is columnar and is fitted into the hole;

[0038] A spherical pressure head 52, which is located at one end of the body 51 and arranged toward the outside of the spherical bushing 12, and the spherical pressure head 52 protrudes from the outer spherical surface of the spherical bushing 12, which is conducive to contact with the support;

[0039] A cable 53 is connected to a side of the body 51 away from the spherical pressure head 52 , and the cable 53 is connected to the PLC control cabinet 6 .

[0040] Thus, the data measured by the weighing sensor is finally fed back to the PLC control cabinet 6, and the PLC control cabinet 6 may include a display to facilitate display of the data information.

[0041] The present invention also provides a material-ball ratio control method, comprising the following steps: a weighing sensor is embedded in the spherical tile, the center positions of the plurality of weighing sensors are located at the center plane of the spherical tile, and the spherical surface of the weighing sensor protrudes from the spherical surface of the spherical tile, see Figure 4 The weight of the rotating part of the ball mill (including the cylinder, liner, steel balls, and raw coal in the cylinder) is transmitted to the weighing sensor through two spherical tiles, and then acts on the two supports through the weighing sensor. The measurement signal of the weighing sensor is processed by the converter and transmitted to the PLC control cabinet.

[0042] Without steel balls, the weighing sensor measured the weight of the rotating part of the coal mill as t1. After the steel balls were installed, the weight of the coal mill was t2. When the coal was added, the weight of the rotating part of the coal mill was t3. Therefore, the weight of the steel balls in the cylinder was t 球 =t2-t1, raw coal weight t 煤 =t3-t2, real-time material-ball ratio λ=t 煤 / t 球 ;

[0043] During the operation of the coal mill, the steel balls and liner are constantly worn out, and steel balls need to be added regularly. Therefore, the control program in the PLC needs to dynamically correct t1 and t2 to ensure that the accurate material-ball ratio is obtained in real time. The measured real-time material-ball ratio λ is compared with the optimal material-ball ratio. Based on the comparison result, the PLC sends a control signal to the feeder to increase or decrease the feed amount, and the real-time material-ball ratio λ in the cylinder is controlled within the optimal material-ball ratio range.

[0044] The present invention can realize real-time measurement of the material-ball ratio, thereby ensuring that the steel ball mill always operates under the optimal material-ball ratio state, which is of great significance for improving the powder making capacity of the steel ball mill and reducing the power consumption and steel consumption of powder making.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0046] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A material-ball ratio control system, characterized in that: Used to control the material-to-ball ratio in the barrel (1) of the milling system, including: A weighing sensor (5) is provided with a plurality of holes on the spherical bearing (12) supporting the hollow shaft (11) of the cylinder, and a weighing sensor (5) is correspondingly embedded in each of the holes to measure the weight of the rotating part of the milling system; A PLC control cabinet (6), wherein the signal of the weighing sensor (5) is transmitted to the PLC control cabinet (6) after data processing by a converter, and the PLC control cabinet (6) compares the material-ball ratio obtained in real time with the optimal material-ball ratio preset by the system, and sends an instruction to increase or decrease the feeding amount to the feeder in the milling system; wherein the center of the hole is located on the center plane (L) of the spherical bushing (12); The weighing sensor (5) comprises: A body (51), the body (51) is columnar and is fitted into the hole; A spherical pressure head (52), the spherical pressure head (52) is located at one end of the body (51) and is arranged toward the outside of the spherical bushing (12), and the spherical pressure head (52) protrudes from the outer spherical surface of the spherical bushing (12); A cable (53) is connected to a side of the body (51) away from the spherical pressure head (52), and the cable (53) is connected to the PLC control cabinet (6).

2. A material-to-ball ratio control method based on a material-to-ball ratio control system according to claim 1, characterized in that: The following steps are involved: S1. When the steel ball is not installed, the weight of the rotating part of the coal mill is measured by the weighing sensor as t1. After the steel ball is installed, the weight of the coal mill is measured as t2. When the coal is added, the weight of the rotating part of the coal mill is measured as t3. Therefore, the weight of the steel ball in the cylinder is obtained as t 球 =t2-t1, raw coal weight t 煤 =t3-t2, real-time material-ball ratio λ=t 煤 / t 球 ; S2, the control program in the PLC dynamically corrects t1 and t2 to ensure accurate real-time material-to-ball ratio λ; S3. Compare the measured real-time material-to-ball ratio λ with the optimal material-to-ball ratio. According to the comparison result, the PLC sends a control signal to the feeder to increase or decrease the feeding amount, so as to control the real-time material-to-ball ratio λ in the cylinder within the optimal material-to-ball ratio range.

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