Soft start control system of pulverizer
Through soft start control system and forward and reverse control, the problem of crusher start-up on the power grid is solved, the smooth start and efficient operation of the motor are achieved, and the motor life is extended.
Patent Information
- Application Number
- CN202421675562.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-16
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-07-16
AI Technical Summary
The starting method of existing crushers has a great impact on the power grid, resulting in motor damage and increased grid pressure, and is prone to interference with surrounding equipment.
The soft start control system is adopted, and the motor voltage and current are gradually increased through the soft starter, and the motor starts smoothly through forward and reverse control, reducing impact on the power grid.
The smooth start of the crusher is achieved, the impact on the power grid is reduced, and the service life and production efficiency of the motor are improved.
Smart Images
Figure CN223141813U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motor starting, and more specifically to a soft start control system for a crusher. Background Art
[0002] In the prior art, traditional starting methods for crushers, such as star-delta step-down starting and autotransformer step-down starting, although have relatively low investment, have a large impact on the power grid during starting. The following disadvantages exist during the starting process:
[0003] The starting current cannot be restricted, and the impact current: When the crusher originally changes from star to delta, the motor is disconnected from the power supply instantaneously, and when it is re-connected in delta, a large phase difference will be generated between the power supply and the motor rotor magnetic flux, resulting in a large impact current;
[0004] The damage of the starting impact current: The excessive starting current impacts the power grid capacity; the excessive starting current will cause excessive torque impact, resulting in impact damage to the mechanical and driving devices of the motor. The excessive starting current is also likely to cause the motor to heat up, especially when the on-site production tasks are intensive and the motor has frequent starting situations. In severe cases, the motor will be burned out; it is easy to cause the electric energy meter to over-measure and increase the line loss;
[0005] The impact current interferes with surrounding equipment: The starting impact current of the motor will increase the pressure on the power supply grid and at the same time affect the surrounding equipment.
[0006] Therefore, how to provide a soft start control system for a crusher that gradually increases the voltage and current of the motor, thereby reducing the impact on the power grid, making the crusher start more smoothly, and reducing the impact on the power grid is an urgent problem to be solved by those skilled in the art. Summary of the Utility Model
[0007] In view of this, the utility model provides a soft start control system for a crusher to solve the problems in the background art.
[0008] In order to achieve the above object, the utility model adopts the following technical scheme:
[0009] The utility model discloses a soft start control system for a crusher, including a crusher motor, and further including: a forward rotation branch, a reverse rotation branch, a circuit breaker, a first contactor, a second contactor, and a soft starter; The three-phase power passes through the circuit breaker and is respectively connected to the forward rotation branch and the reverse rotation branch; The first contactor is arranged on the forward rotation branch, and the second contactor is arranged on the reverse rotation branch; The common end of the forward rotation branch and the reverse rotation branch is connected to the input end of the soft start, and the output end of the soft starter is respectively connected to the crusher motor; The first contactor and the second contactor are controlled by a selection knob to cooperate to realize the forward rotation and reverse rotation of the crusher motor.
[0010] Preferably, in the above-mentioned soft start control system of a crusher, the selection knob includes a first selection knob, and the first selection knob includes at least: local / stop / remote three gears.
[0011] Preferably, in the above-mentioned soft start control system of a crusher, the selection knob includes a second selection knob; the second selection knob includes at least: forward / stop / reverse three gears.
[0012] Preferably, in the above-mentioned soft start control system of a crusher, it further includes a current detection module. When the current detection module detects that the current in the forward rotation branch is greater than the preset value, the current detection module controls the crusher motor to cut off the power.
[0013] Preferably, in the above-mentioned soft start control system of a crusher, the soft starter further includes: a fault signal switch; through the fault signal switch, the fault contact of the soft starter is closed, the AC220V between the secondary circuits is disconnected, the coils of KM1 and KM2 are not powered on, the primary line circuit is disconnected, and the motor stops running.
[0014] Preferably, in the above-mentioned soft start control system of a crusher, the soft starter adopts a 75KW soft starter.
[0015] Preferably, in the above-mentioned soft start control system of a crusher, the soft starter further includes: a programming signal switch, a bypass signal switch, and a short-circuit signal switch;
[0016] A programmable logic controller signal-connected to the programming signal switch, the bypass signal switch, and the short-circuit signal switch, and a forward rotation branch, a reverse rotation branch, and a braking branch signal-connected to the programmable logic controller, and the forward rotation branch, the reverse rotation branch, and the braking branch are respectively connected to the crusher motor.
[0017] It can be seen from the above technical solutions that compared with the prior art, the present invention discloses a soft start control system for a crusher. The soft starter can gradually increase the voltage and current of the motor during the start-up process, thereby reducing the impact on the power grid, making the crusher start more smoothly, and reducing the impact on the power grid. In order to make the two sides of the hammer wear evenly, it is necessary to control the motor to achieve forward and reverse rotation. At the same time, the rotation direction needs to match the direction of the crusher feed hopper. Through forward and reverse rotation control, it can be ensured that the crusher always maintains the best state during operation, improving production efficiency and service life.
[0018] In summary, the crusher adopts the method of soft start plus forward and reverse rotation control, which can ensure smooth start-up of the crusher, little impact on the power grid, reliable operation, and economy and practicality. This control method is applicable to crushers of various scales, especially in the grain processing industry that requires continuous and efficient operation, and can better play its advantages. Description of the Drawings
[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.
[0020] Figure 1 It is the control schematic diagram provided by the present invention;
[0021] Figure 2 It is the control schematic diagram of the selection knob provided by the present invention;
[0022] Figure 3 It is the control schematic diagram of the soft starter provided by the present invention. Specific embodiments
[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the 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 belong to the scope of protection of the present invention.
[0024] The embodiment of the present invention discloses a soft start control system for a crusher, as Figures 1-3 shown, which includes a crusher motor, and also includes: a forward rotation branch, a reverse rotation branch, a circuit breaker, a first contactor, a second contactor, and a soft starter; the three-phase power passes through the circuit breaker and is respectively connected to the forward rotation branch and the reverse rotation branch; the first contactor is arranged on the forward rotation branch, and the second contactor is arranged on the reverse rotation branch; the common end of the forward rotation branch and the reverse rotation branch is connected to the input end of the soft start, and the output end of the soft starter is respectively connected to the crusher motor; the first contactor and the second contactor are controlled by a selection knob to cooperate to realize the forward rotation and reverse rotation of the crusher motor.
[0025] Specifically, the control system consists of a molded case circuit breaker, two contactors, and a soft starter. Among them, the configuration of the soft starter is selected one grade larger, and a 75KW soft starter is adopted.
[0026] Ensure that the A101Q1 circuit breaker is in the closed state before starting the equipment.
[0027] The A101S1 local / stop / remote three - position is the first selection knob. When turned to the local state, the device can be started locally. The A101S2 forward / stop / reverse three - position is the second selection knob. When turned to the forward state and the motor starts normally, the coil of A101KQ is energized, its open contact closes, the coil of A101K2 is not energized, its closed contact is in the normal state, the coil of A101KM1 is energized, its normally - closed contact opens, the coil of A101KM2 is not energized, its closed contact is in the normal state, and it is connected to the 7th line (neutral line). At this time, the crusher starts to rotate forward. On the contrary, when the A101S2 forward / stop / reverse three - position selection knob is turned to the reverse state and the motor starts normally, the coil of A101KQ is energized, its open contact closes, the coil of A101K2 is not energized, its closed contact is in the normal state, the coil of A101KM2 is energized, its normally - closed contact opens, the coil of A101KM1 is not energized, its closed contact is in the normal state, and it is connected to the 7th line (neutral line). At this time, the crusher starts to rotate in reverse;
[0028] The first selection knob A101S1, when turned to the remote state, can start the device remotely. The relay coil of A101KRA is energized, and the open contact 5 / 9 of its conversion contact closes.
[0029] If the PLC output point drives the forward relay A101KR1 at this time, the coil of the relay A101KR1 is energized, and the open contact 5 / 9 of its conversion contact also closes. When the motor starts normally, the coil of A101KQ is energized, its open contact closes, the coil of A101K2 is not energized, its closed contact is in the normal state, the coil of A101KM1 is energized, its normally - closed contact opens, the coil of A101KM2 is not energized, its closed contact is in the normal state, and it is connected to the 7th line (neutral line). At this time, the crusher starts to rotate forward; If the PLC output point drives the reverse relay A101KR2 at this time, the coil of the relay A101KR2 is energized, and the open contact 5 / 9 of its conversion contact also closes. When the motor starts normally, the coil of A101KQ is energized, its open contact closes, the coil of A101K2 is not energized, its closed contact is in the normal state, the coil of A101KM2 is energized, its normally - closed contact opens, the coil of A101KM1 is not energized, its closed contact is in the normal state, and it is connected to the 7th line (neutral line). At this time, the crusher starts to rotate in reverse;
[0030] If a fault occurs during the motor startup process, such as overload, overheat, etc., the fault signal switch K3, that is, the fault contact of the soft starter closes. At this time, the relay coil of A101K2 is energized, its normally - closed contact opens, the secondary circuit between AC220V is also disconnected, the coils of KM1 and KM2 are not energized, the primary - line circuit is disconnected, and the motor will stop running. At this time, the normally - open contact of A101K2 closes, and the PLC detects the fault condition of the soft starter, and the system alarms to remind the operator to check the operating state of the equipment.
[0031] To further optimize the above technical solution, it further includes a current detection module. When the current detection module detects that the current in the forward rotation branch is greater than a preset value, the current detection module controls the crusher motor to cut off the power supply.
[0032] Specifically, the current detection module is an ammeter;
[0033] To further optimize the above technical solution, the soft starter further includes: a programming signal switch K2, a bypass signal switch K1, and a short - circuit signal switch K4;
[0034] A programmable logic controller that is signal - connected to the programming signal switch K2, the bypass signal switch K1, and the short - circuit signal switch K4, and the forward rotation branch, the reverse rotation branch, and the braking branch that are signal - connected to the programmable logic controller. The forward rotation branch, the reverse rotation branch, and the braking branch are respectively connected to the crusher motor.
[0035] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.
[0036] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A soft start control system for a crusher, including a crusher motor, characterized in that, It further includes: A forward rotation branch, a reverse rotation branch, a circuit breaker, a first contactor, a second contactor, and a soft starter; The three-phase power passes through the circuit breaker and is respectively connected to the forward rotation branch and the reverse rotation branch; a first contactor is provided on the forward rotation branch, and a second contactor is provided on the reverse rotation branch; the common end of the forward rotation branch and the reverse rotation branch is connected to the input end of the soft starter, and the output end of the soft starter is respectively connected to the grinder motor; the first contactor and the second contactor are controlled by a selection knob to cooperate to achieve the forward rotation and reverse rotation of the grinder motor.
2. The soft start control system of a crusher according to claim 1, characterized in that, The selection knob includes a first selection knob, and the first selection knob includes at least: local / stop / remote three gears.
3. The soft start control system of a crusher according to claim 1, characterized in that, The selection knob includes a second selection knob; The second selection knob includes at least: forward rotation / stop / reverse rotation three gears.
4. The soft start control system of a crusher according to claim 1, characterized in that It further includes a current detection module. When the current detection module detects that the current of the forward rotation branch is greater than a preset value, the current detection module controls the grinder motor to cut off the power.
5. The soft start control system of a crusher according to claim 1, characterized in that, The soft starter further includes: a fault signal switch; through the fault signal switch, the fault contact of the soft starter is closed, the secondary circuit AC220V is disconnected, the coils of KM1 and KM2 are not energized, the primary line circuit is disconnected, and the motor stops running.
6. The soft start control system of a crusher according to claim 1, characterized in that, The soft starter uses a 75KW soft starter.
7. The soft start control system of a crusher according to claim 1, characterized in that, The soft starter further includes: a programming signal switch, a bypass signal switch, and a short-circuit signal switch; A programmable logic controller signal-connected to the programming signal switch, the bypass signal switch, and the short-circuit signal switch, and a forward rotation branch, a reverse rotation branch, and a braking branch signal-connected to the programmable logic controller. The forward rotation branch, the reverse rotation branch, and the braking branch are respectively connected to the grinder motor.