Ball mill positioning shutdown control device

Abstract

The invention relates to the technical field of ball mill shutdown control, in particular to a ball mill positioning shutdown control device. The control device comprises a proximity switch arranged on one side of a ball mill barrel, the proximity switch can sense the distance between the proximity switch and the ball mill barrel, the proximity switch is electrically connected with a PLC, the PLC is electrically connected with a high-voltage frequency converter, and the high-voltage frequency converter is electrically connected with a motor. Through cooperative work of the proximity switch, the PLC, the high-voltage frequency converter and the motor, inertia of the ball mill during shutdown can be effectively reduced, accurate positioning of shutdown of the ball mill is achieved, the accuracy of the parking position is greatly improved, the vehicle returning situation caused by the inertia of the ball mill and the problem of post multiple shutdown caused by the vehicle returning situation are avoided, and the service life of the ball mill is prolonged. And the impact of frequent start and stop on high-voltage equipment is reduced, the continuity of a post process is guaranteed, the equipment fault occurrence rate is reduced, and good conditions are created for a subsequent process.

Description

Technical Field

[0001] The invention relates to the technical field of ball mill shutdown control, in particular to a ball mill positioning shutdown control device. Background Art

[0002] Ball mill is the key equipment for crushing materials after they are broken. It is widely used in cement, silicate products, new building materials, refractory materials, fertilizers, black and non-ferrous metal beneficiation, glass and ceramics and other production industries to dry or wet grind various ores and other grindable materials. As the main grinding equipment, ball mill is irreplaceable in the entire beneficiation process.

[0003] The ball mill currently in use has two inlets and outlets on the opposite sides of the middle of the cylinder. When shutting down, the feed inlet must be facing upward and the discharge inlet must be facing downward to facilitate material discharge and next feeding. When the ball mill is running, due to its own weight and the steel ball materials in the ball mill, it can generate a large load and inertia during operation. The current free stop method will cause the ball mill to continue to rotate due to inertia and produce a return situation. However, this distance will be uncertain due to the different weights of the steel balls and materials in the cylinder, which will cause multiple shutdowns at the station. Frequent starts and stops will cause multiple impacts on high-voltage equipment in a short period of time, resulting in inconsistency of the station process and a high incidence of equipment failures.

[0004] Therefore, it is necessary to provide a control device that can reduce the inertia generated by the ball mill when it is shut down and achieve shutdown positioning. Summary of the invention

[0005] The object of the present invention is to provide a ball mill positioning and stopping control device, which can solve the above-mentioned technical problems.

[0006] The present invention provides a ball mill positioning and shutdown control device, comprising a proximity switch arranged on one side of a ball mill cylinder, the proximity switch can sense the distance between the proximity switch and the ball mill cylinder, the proximity switch is electrically connected to a PLC controller, the PLC controller is electrically connected to a high-voltage frequency converter, and the high-voltage frequency converter is electrically connected to a motor.

[0007] Preferably, a sensing plate is provided on one side of the outer wall of the ball mill cylinder corresponding to the proximity switch. When the sensing plate is close to the proximity switch, the feed port of the ball mill faces upward and the discharge port faces downward.

[0008] Preferably, the PLC controller is connected to a stop button, and the stop button is used to control the ball mill to stop.

[0009] Preferably, the PLC controller transmits a frequency signal to the high-voltage frequency converter, and the high-voltage frequency converter controls the speed change of the motor.

[0010] Preferably, the PLC controller is electrically connected to a vibration sensor, the vibration sensor is located at the main shaft and bearings of the ball mill, and the vibration sensor is used to detect the vibration of the ball mill during shutdown.

[0011] Preferably, the PLC controller is electrically connected to an alarm, and the alarm may be an audible and visual alarm.

[0012] Preferably, the PLC controller is connected to a host computer, and the host computer and the PLC controller communicate with each other using industrial Ethernet.

[0013] Preferably, the host computer can be one of an industrial computer, a workstation, and a touch screen.

[0014] The present invention also provides a control method for a ball mill positioning and stopping control device, comprising the following steps:

[0015] Press the stop button, the stop command generated by the stop button is transmitted to the PLC controller, the PLC controller transmits a low-frequency signal to the high-voltage inverter, and the high-voltage inverter controls the motor to reduce the speed;

[0016] The proximity switch detects the passage of the sensing plate and transmits the detected position signal to the PLC controller;

[0017] When the motor speed is lower than the set value and the proximity switch detects that the induction plate is approaching, the PLC controller sends a shutdown signal again and the ball mill completes the shutdown.

[0018] Preferably, the vibration sensor transmits the detected vibration signal to the PLC controller. When the vibration signal is different from the vibration signal range set in the PLC controller, the PLC controller sends an alarm signal and turns on the alarm. The alarm is arranged to cooperate with the vibration sensor to facilitate timely detection of potential problems and take measures, thereby improving the safety and reliability of equipment operation.

[0019] Beneficial effects:

[0020] The present invention detects the position and rotation speed of the cylinder in real time through the proximity switch, and can transmit the frequency signal to the high-voltage frequency converter through the PLC controller, so as to control the motor speed; ensure the low-frequency operation of the ball mill from shutdown to reduce the return distance caused by free parking.

[0021] The present invention can effectively reduce the inertia of the ball mill when it stops, realize accurate positioning of the ball mill when it stops, greatly improve the accuracy of the parking position, avoid the situation of returning the ball mill due to the inertia of the ball mill and the problem of multiple shutdowns of the post caused by it, reduce the impact of frequent start and stop on high-voltage equipment, ensure the continuity of post process, reduce the occurrence rate of equipment failure, and create good conditions for subsequent processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 This is a schematic diagram of the positions of the proximity switch and the sensor plate according to an embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 1- cylinder, 2- induction plate, 3- proximity switch, 4- connection plate, 5- host computer, 6- alarm, 7- PLC controller, 8- high voltage inverter, 9- motor, 10- stop button, 11- vibration sensor. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Example 1

[0031] A ball mill positioning and stopping control device comprises a proximity switch 3 arranged on one side of a ball mill cylinder 1, and a sensing plate 2 is arranged on one side of an outer wall of the ball mill cylinder 1 corresponding to the proximity switch 3 and extending outward, and the sensing plate 2 is a concentric arc plate of the cylinder 1, such as Figure 1 As shown. When the induction plate 2 passes the proximity switch 3, the minimum distance between each point on the induction plate 2 and the proximity switch 3 is the same. The induction plate 2 can be welded or bolted to the outer wall of the cylinder 1 through the connecting plate 4, and the proximity switch 3 can be fixed on the outer support frame of the ball mill. The proximity switch 3 has a highly sensitive sensing ability and can accurately detect the distance change between it and the cylinder 1 of the ball mill, and then accurately confirm the specific position of the induction plate 2. The other end of the proximity switch 3 is connected to the power supply. When the cylinder 1 of the ball mill is in a rotating state, as the cylinder 1 continues to rotate, the induction plate 2 periodically passes through the position area where the proximity switch 3 is located.

[0032] When the induction plate 2 is close to the proximity switch 3 and the distance between them is the smallest, the feed port of the ball mill faces upward and the discharge port faces downward. The induction plate 2 and the proximity switch 3 adopt the above positional relationship, which can position the cylinder 1 when the machine is stopped, so that the feed port and the discharge port are at the target position after the machine is stopped, ensuring the smooth discharge of materials and the convenience of subsequent feeding.

[0033] like Figure 2 As shown, the proximity switch 3 is electrically connected to the PLC controller 7, the PLC controller 7 is electrically connected to the high-voltage inverter 8, and the high-voltage inverter 8 is electrically connected to the motor 9. The PLC controller 7 transmits a frequency signal to the high-voltage inverter 8, and the high-voltage inverter 8 controls the speed of the motor 9 according to the frequency signal. The PLC controller 7 realizes precise control of the operating state of the motor 9 through the high-voltage inverter 8.

[0034] The PLC controller 7 is connected to a stop button 10, which is used to control the ball mill to stop. After pressing the stop button 10, the PLC controller 7 receives the stop command and controls the motor 9 to slow down through the high-voltage frequency converter 8, thereby achieving a smooth transition of the ball mill shutdown process and avoiding an uncertain return distance after an extreme speed shutdown.

[0035] The PLC controller 7 is electrically connected to the vibration sensor 11. The main shaft and bearing of the ball mill are both provided with vibration sensors 11. The vibration sensor 11 is used to detect the vibration of the ball mill during shutdown. The PLC controller 7 is electrically connected to the alarm 6. The alarm 6 can be an audible and visual alarm. When the vibration signal is different from the vibration signal range set in the PLC controller 7, the PLC controller 7 sends an alarm signal and turns on the alarm 6, which can remind the staff immediately so that they can take corresponding countermeasures in time to avoid further deterioration of potential faults.

[0036] The PLC controller 7 is connected to the host computer 5, and the host computer 5 and the PLC controller 7 communicate with each other using industrial Ethernet. The host computer 5 can be an industrial computer, a workstation, or a touch screen. The staff can remotely monitor, record and analyze the operating status of the ball mill through the host computer 5, thereby improving the intelligent management level and overall operating efficiency of the ball mill.

[0037] Method Embodiment

[0038] A control method for a ball mill positioning and stopping control device comprises the following steps:

[0039] The shutdown duration is set on the host computer 5, and the shutdown button 10 is pressed. The shutdown command generated by the shutdown button 10 is transmitted to the PLC controller 7, and the PLC controller 7 transmits a low-frequency signal to the high-voltage frequency converter 8. The high-voltage frequency converter 8 controls the motor 9 to reduce the speed according to the low-frequency signal, and reduces it to the minimum frequency value within the set shutdown duration;

[0040] The proximity switch 3 detects the passage of the induction plate 2 and transmits the detected position signal to the PLC controller 7, so as to confirm and control the position of the cylinder 1 when the machine is stopped;

[0041] The PLC controller 7 sets the lower limit of the motor 9 speed, which is slightly greater than the minimum frequency value; when the motor 9 speed is lower than the set value and the proximity switch 3 detects the proximity of the induction plate 2, the PLC controller 7 sends a stop signal again, and the ball mill is shut down. Ensure that the feed port of the ball mill faces upward and the discharge port faces downward after the shutdown.

[0042] The vibration sensor 11 transmits the detected vibration signal to the PLC controller 7 . When the vibration signal is different from the vibration signal range set in the PLC controller 7 , the PLC controller 7 sends out an alarm signal and turns on the alarm 6 .

[0043] 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 ball mill positioning and stopping control device, characterized in that: It comprises a proximity switch arranged on one side of the ball mill cylinder, the proximity switch can sense the distance between the ball mill cylinder, the proximity switch is electrically connected to a PLC controller, the PLC controller is electrically connected to a high-voltage frequency converter, and the high-voltage frequency converter is electrically connected to a motor.

2. The ball mill positioning and stopping control device according to claim 1, characterized in that: A sensing plate is provided on one side of the outer wall of the ball mill cylinder corresponding to the proximity switch. When the sensing plate is close to the proximity switch, the feed port of the ball mill faces upward and the discharge port faces downward.

3. The ball mill positioning and stopping control device according to claim 1, characterized in that: The PLC controller is connected to a stop button, and the stop button is used to control the ball mill to stop.

4. The ball mill positioning and stopping control device according to claim 1, characterized in that: The PLC controller transmits a frequency signal to the high-voltage inverter, and the high-voltage inverter controls the speed change of the motor.

5. The ball mill positioning and stopping control device according to claim 1, characterized in that: The PLC controller is electrically connected to a vibration sensor, which is located at the main shaft and bearing of the ball mill. The vibration sensor is used to detect the vibration of the ball mill during shutdown.

6. The ball mill positioning and stopping control device according to claim 1, characterized in that: The PLC controller is electrically connected to an alarm, and the alarm can be an audible and visual alarm.

7. The ball mill positioning and stopping control device according to claim 1, characterized in that: The PLC controller is connected to a host computer, and the host computer and the PLC controller communicate with each other using industrial Ethernet.

8. The ball mill positioning and stopping control device according to claim 7, characterized in that: The host computer can be one of an industrial computer, a workstation, and a touch screen.

9. A control method for a ball mill positioning and stopping control device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Press the stop button, the stop command generated by the stop button is transmitted to the PLC controller, the PLC controller transmits a low-frequency signal to the high-voltage inverter, and the high-voltage inverter controls the motor to reduce the speed; The proximity switch detects the passage of the sensing plate and transmits the detected position signal to the PLC controller; When the motor speed is lower than the set value and the proximity switch detects that the induction plate is approaching, the PLC controller sends a shutdown signal again and the ball mill completes the shutdown.

10. The control method according to claim 9, characterized in that: The vibration sensor transmits the detected vibration signal to the PLC controller. When the vibration signal is different from the vibration signal range set in the PLC controller, the PLC controller sends an alarm signal and turns on the alarm.

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