Method for solving the problem of floatation machine unable to stop normally

Abstract

The present application relates to the technical field of flotation machine, and particularly relates to a method for solving the problem that a flotation machine cannot stop normally, which comprises the following steps: stop button SB2 setting, 3DI built-in point setting and stop operation; the stop button SB2 is changed from a normally open point to a normally closed point, and the 3DI built-in point is changed from the original normally open setting to normally closed; by setting the 3DI built-in point as normally closed, if the equipment needs to be started, the 3DI needs to be powered or there is no electric signal on the 3DI or the signal voltage is insufficient, and under the premise, the equipment does not have the starting condition, therefore, when the equipment starts, the equipment can be normally powered, and it can be ensured that during the power supply process, the problem that the equipment cannot be closed due to insufficient signal does not occur; when the equipment is closed, only the 3DI is powered off, the 3DI built-in point is returned to the closed state, the contactor KM coil is powered off and disconnected, the motor stops running, and the problem that the existing flotation machine cannot be normally stopped due to the fact that the signal is attenuated because of the long cable length and long-distance control is prevented.

Description

Technical Field

[0001] This invention relates to the field of flotation machine technology, and in particular to a method for solving the problem of flotation machines being unable to stop normally. Background Technology

[0002] The mineral processing technology adopts a semi-autogenous grinding, ball mill continuous grinding-weak magnetic separation-strong magnetic separation-regrinding-reverse flotation process. The reverse flotation process consists of one roughing, one cleaning, and three scavenging stages, totaling three series. The aerated flotation machine is the core equipment in the flotation process, playing a decisive role in reducing the grade of iron concentrate powder and tailings and improving the metal recovery rate.

[0003] The flotation machine motor control module uses the ST500 Wanlong intelligent motor controller and protector, which allows for editing and modification of signal input, output, and protection functions via the display screen and buttons. The operating power supply is AC220V, and the intelligent motor control signal voltage is DC24V.

[0004] Its working principle: such as Figure 1 As shown, when the 660V main circuit breaker QF1 in the control cabinet is closed and the 220V working power circuit breaker QF2 is powered on, the changeover switch SA is set to "local" (1-2 are on). Pressing the start button SB1 connects the DC 24V line #2 through terminals SA1-2 and the normally open contact of the start button SB1 to the start terminal 4DI. 4DI is energized, its built-in normally open contact closes, the contactor KM coil is energized and engages, and the KM auxiliary normally open contact simultaneously closes and holds, connecting the AC 660V main circuit power supply to the flotation machine motor, and the motor begins to run. When the stop button SB2 is pressed, the DC 24V line #2 through terminals SA1-2 and the normally open contact of the stop button SB2 to the stop terminal 3DI. 3DI is energized, its built-in normally open contact closes, the contactor KM coil is de-energized and disconnects, the KM auxiliary self-holding normally open contact opens, the AC 660V main circuit power supply to the flotation machine motor is cut off, and the motor stops running.

[0005] However, there are problems with stopping the existing flotation machine: the flotation machine often fails to stop when SB2 is pressed or the SA switch is set to the "0" position. There are usually two reasons for this.

[0006] First, the original design did not consider long-distance control: the distance between the controller and the field operation box is 300-500 meters, and the signal will attenuate. Although the 3DI is powered, the signal voltage is weak and insufficient to make the built-in switch operate.

[0007] Secondly, regardless of the state of the SA changeover switch, 3DI is not powered on and cannot de-energize KM, so the flotation machine cannot be stopped according to the instructions.

[0008] Therefore, it is necessary to provide a method to solve the above-mentioned technical problem of the flotation machine being unable to stop normally. Summary of the Invention

[0009] To solve the above-mentioned technical problems, the present invention provides a method for solving the problem of flotation machines being unable to stop normally.

[0010] This invention provides a method for resolving the inability of a flotation machine to stop normally, including setting the stop button SB2, setting the 3DI built-in position, and performing a shutdown operation:

[0011] S1, Stop button SB2 setting: Change the stop button SB2 from normally open to normally closed. Line #2 DC24V passes through terminal SA1-2, through the normally closed stop button SB2, and reaches the stop terminal 3DI.

[0012] S2, 3DI built-in point setting: Change the 3DI built-in point from "normally open" to "normally closed";

[0013] S3. Shutdown Operation: By setting the SA1-2 selector switch to "0" or "remote", the 3DI is de-energized, the 3DI built-in contact is closed, which in turn de-energizes the KM contactor coil and opens the KM auxiliary self-holding normally open contact, at which point the motor stops running.

[0014] Preferably, the S4 shutdown operation can also be performed by pressing the stop button SB2, switching SB2 from the closed state to the open state, causing 3DI to lose power, and thus stopping the motor.

[0015] Preferably, it also includes controller modification, which involves installing a Л-type filter inside the control cabinet and using a special cable with a metal shielding mesh for the signal cable connected to the control cabinet.

[0016] Preferably, the grounding of the dedicated cable with metal shielding mesh is changed from grounding at both ends to grounding at one end.

[0017] Preferably, when a dedicated cable is used for signal transmission in the control cabinet, the operating signal is a DC digital level signal.

[0018] By using a DC digital level signal as the transmission signal, the output impedance of the transmitting instrument is very high, which is equivalent to a constant current source. Therefore, it is suitable for long-distance transmission and improves the stability of long-distance signal transmission.

[0019] Compared with related technologies, the method for solving the problem of flotation machines failing to stop normally provided by the present invention has the following beneficial effects:

[0020] 1. This invention sets the built-in point of the 3DI to normally closed. If the device needs to be started, it requires power to the 3DI. If there is no electrical signal on the 3DI or the signal voltage is insufficient, the device will not meet the conditions for starting. Therefore, when the device is started, it can be powered normally, which can ensure that there will be no problem of being unable to shut down due to insufficient signal during the power supply process. Moreover, when shutting down, it is only necessary to de-energize the 3DI and return the built-in point of the 3DI to the closed state, which will de-energize the contactor KM coil and disconnect the motor. By controlling the 3DI to de-energize, the motor can be stopped, which prevents the existing flotation machine from stopping due to excessive cable length and signal attenuation during long-distance control, which would prevent the flotation machine from being stopped normally.

[0021] 2. By setting the stop button SB2 to stop the motor, this invention ensures that when the signal is weak during use, the power supply to 3DI can be stopped to ensure normal operation during shutdown.

[0022] 3. This invention uses a π-type filter to suppress high-frequency signals, thereby achieving signal filtering. It can be used to filter out noise in the circuit, improve signal quality, increase signal stability, and thus improve circuit performance. Furthermore, the π-type filter can also be used to filter out oscillations in the circuit, thereby improving circuit stability. Attached Figure Description

[0023] Figure 1 A schematic diagram of the circuit structure for normal operation of the flotation machine provided by the present invention;

[0024] Figure 2 for Figure 1 The diagram shows a schematic of the circuit structure for the flotation machine operation provided by the present invention.

[0025] Figure 3 for Figure 1 The diagram shows a method for resolving the inability of a flotation machine to stop normally. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of the embodiments of the present invention, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, if terms such as "first," "second," or "third" appear, they are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0032] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0033] refer to Figures 1 to 3 The present invention provides a method for solving the problem of flotation machine failing to stop normally, including: setting the stop button SB2, setting the 3DI built-in position, and the shutdown operation.

[0034] S1, Stop button SB2 setting: Change the stop button SB2 from normally open to normally closed. Line #2 DC24V passes through terminal SA1-2, through the normally closed stop button SB2, and reaches the stop terminal 3DI.

[0035] S2, 3DI built-in point setting: Change the 3DI built-in point from "normally open" to "normally closed";

[0036] S3. Shutdown Operation: By setting the SA1-2 selector switch to "0" or "remote", the 3DI is de-energized, the 3DI built-in contact is closed, which in turn de-energizes the KM contactor coil and opens the KM auxiliary self-holding normally open contact, at which point the motor stops running.

[0037] It should be noted that in this invention, the device needs to start, which requires 1) the KM contactor coil to be energized; and 2) the 3DI built-in switch to be open, without affecting the KM contactor coil. However, if the 3DI built-in switch is set to normally closed, the device cannot start if it requires power to the 3DI, or if there is no electrical signal on the 3DI, or the signal voltage is insufficient. Therefore, when the device starts, it can be powered normally, ensuring that there will be no problem of failure to shut down due to insufficient signal during power supply. Furthermore, to shut down, simply de-energize the 3DI and return the 3DI built-in switch to the closed state to de-energize the KM contactor coil, stopping the motor. By controlling the 3DI to de-energize, the motor can be stopped, preventing the inability to properly shut down the flotation machine due to excessively long cables and signal attenuation during long-distance control.

[0038] In an embodiment of the present invention, the S4 shutdown operation can also be performed by pressing the stop button SB2, switching SB2 from the closed state to the open state, causing 3DI to lose power, thereby stopping the motor.

[0039] It should be noted that by setting the stop button SB2 to stop the motor, it is ensured that when the signal is weak during use, the power supply to 3DI can be stopped to ensure normal operation during shutdown.

[0040] In an embodiment of the present invention, the controller is also modified: a Л-type filter is installed in the control cabinet, and a special cable with a metal shielding mesh is used for the signal cable connected to the control cabinet.

[0041] It should be noted that π-type filters can be installed in all control cabinets. These filters suppress high-frequency signals, thus achieving signal filtering. They can be used to filter out noise in the circuit, improve signal quality, increase signal stability, and thereby improve circuit performance. Furthermore, π-type filters can also be used to filter out oscillations in the circuit, thereby improving circuit stability.

[0042] In an embodiment of the present invention, the grounding of the dedicated cable with metal shielding mesh is changed from grounding at both ends to grounding at one end.

[0043] It should be noted that when the shielding layer is grounded at one end, no potential circulating current flows through the shielding layer. The purpose of single-end grounding is to eliminate electromagnetic interference by suppressing the potential difference, thereby ensuring signal stability.

[0044] In an embodiment of the present invention, when a dedicated cable is used for signal transmission in the control cabinet, the operating signal is selected as a DC digital level signal.

[0045] It should be noted that by using a DC digital level signal as the transmission signal, the output impedance of the transmitting instrument is very high, which is equivalent to a constant current source. Therefore, it is suitable for long-distance transmission and improves the stability of long-distance signal transmission.

[0046] The working principle of the method for solving the problem of flotation machine failing to stop normally provided by the present invention is as follows:

[0047] In this invention, the device needs to be started, which requires the following two conditions to be met.

[0048] 1. The KM contactor coil is energized;

[0049] 2. The 3DI built-in contact point is disconnected, which does not affect the KM contactor coil.

[0050] When the 3DI built-in points are set to normally closed, if the device needs to be started, such as... Figure 2 As shown, when the 660V main circuit breaker QF1 in the control cabinet is closed and the 220V working power circuit breaker QF2 is energized, the changeover switch SA is set to "local" (1-2 are on). Pressing the start button SB1, the DC 24V of line #2 passes through terminals SA1-2, via the normally open contact of start button SB1, to start terminal 4DI. 4DI is energized, and its built-in normally open contact closes. However, because 3DI is already set to normally closed mode and SB2 is pressed to set it to normally closed mode, the contactor KM coil cannot be energized and engage. At this point, power needs to be supplied to 3DI. When 3DI is energized, its built-in normally closed contact opens, the contactor KM coil is energized and engages, the KM auxiliary normally open contact closes and simultaneously engages its self-holding mechanism, the AC 660V main circuit power supply to the flotation machine motor is connected, and the motor starts running.

[0051] When shutdown is required, simply de-energize the 3DI and return its built-in contacts to the closed state. This will de-energize the contactor KM coil, stopping the motor. On one hand, the motor can be stopped by controlling the 3DI to de-energize it via the control cabinet. On the other hand, pressing the stop button SB2 will stop the power supply to the 3DI, thus stopping the motor. This ensures that even with a weak signal, stopping the 3DI will guarantee normal shutdown operation. Furthermore, these methods prevent the failure to properly shut down existing flotation machines due to excessively long cables and signal attenuation during long-distance control.

[0052] The circuits and controls involved in this invention are all existing technologies and will not be described in detail here.

[0053] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for solving the problem of a flotation machine failing to stop normally, characterized in that, include: Stop button SB2 settings, 3DI built-in point settings and shutdown operation: S1, Stop button SB2 setting: Change the stop button SB2 from normally open to normally closed. Line #2 DC24V passes through terminal SA1-2, through the normally closed stop button SB2, and reaches the stop terminal 3DI. S2, 3DI built-in point setting: Change the 3DI built-in point from "normally open" to "normally closed"; S3. Shutdown Operation: By setting the SA1-2 selector switch to "0" or "remote", the 3DI is de-energized, the 3DI built-in contact is closed, which in turn de-energizes the KM contactor coil and opens the KM auxiliary self-holding normally open contact, at which point the motor stops running.

2. The method for solving the problem of flotation machine failing to stop normally according to claim 1, characterized in that, The shutdown operation can also be performed by pressing the stop button SB2, switching SB2 from the closed state to the open state, causing 3DI to lose power, and thus stopping the motor.

3. The method for solving the problem of flotation machine failing to stop normally according to claim 1, characterized in that, This also includes controller modification, such as installing a first-stage L-type filter inside the control cabinet and using a special cable with a metal shielding mesh for the signal cable connected to the control cabinet.

4. The method for solving the problem of flotation machine failing to stop normally according to claim 3, characterized in that, The grounding of the dedicated cable with metal shielding mesh will be changed from grounding at both ends to grounding at one end.

5. The method for solving the problem of flotation machine failing to stop normally according to claim 3, characterized in that, When using dedicated cables for signal transmission in the control cabinet, DC digital level signals are selected for the operation signals.

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