Feeding matching control system and control method for electric crushing workstation

Abstract

The invention relates to improvement of a crushing workstation feeding matching control technology, in particular to an electric crushing workstation feeding matching control system and a control method. Which comprises a crusher (1) and is characterized by further comprising a current value detection module (2), a PLC (programmable logic controller) (3) and a vibrating feeder (4), and the crusher (1), the current value detection module (2), the PLC (3) and the vibrating feeder (4) are sequentially connected. The control method can be effectively applied to a feeding matching control system of the electric crushing workstation, and by controlling the vibrating feeder, the situation that the electric crusher is overloaded and blocked is reduced, the downtime of equipment is shortened, the effective working time of the equipment is delayed, and the working efficiency of the equipment is indirectly improved.

Description

Technical Field

[0001] The invention relates to an improvement of a feed matching control technology for a crushing workstation, and in particular to a feed matching control system and a control method for an electric crushing workstation. Background Art

[0002] In the normal working process of the crushing workstation with existing technology, the vibrating feeder continuously feeds the stone in the hopper into the crusher, and the crusher motor drives the rotor and plate hammer to rotate and hit the stone, and the stone hits the impact plate to achieve the crushing of the stone. During normal operation, the vibrating feeder vibrates and evenly transports the stone into the crusher feed port, the crusher load fluctuates little, and the operation is stable. However, if too much material is fed at one time, or the stone contains a large number of large-sized stones, the load of the crusher will surge when crushing larger-sized stones. At the same time, a large amount of stone is still pouring into the feed port, which can easily cause the current of the crusher motor to surge, the motor to overload, and the motor overload protection device to be triggered, eventually causing the crusher to jam and stop. After the crusher is jammed and stopped, it takes a lot of time for on-site personnel to clear the accumulated stones inside the crusher, and the whole machine can only run again after the material is cleared. Each shutdown will cost a lot of manpower and time costs. Summary of the invention

[0003] In view of the problems mentioned in the background technology, the purpose of the present invention is to provide a feed matching control system and control method for an electric crushing workstation to solve the problems mentioned in the background technology.

[0004] The above technical purpose of the present invention is achieved through the following technical solutions: an electric crushing workstation feed matching control system, including a crusher, a current value detection module, a PLC controller and a vibrating feeder, wherein the crusher, the current value detection module, the PLC controller and the vibrating feeder are connected in sequence.

[0005] As a preferred embodiment, the PLC controller performs logic control and detects the working current of the motor of the crusher in real time. When the crusher is fed too much or crushes large-sized stones, the load of the crusher increases and the real-time working current surges;

[0006] When the real-time working current exceeds the high current threshold of the normal working range, the control condition is triggered, the PLC controller stops outputting, the vibrating feeder stops running, and the load no longer increases after the crusher feed is reduced. The motor avoids overload shutdown. After the stone part in the crusher is processed, the motor load continues to decrease. When the real-time working current of the crusher is lower than the low current threshold of the working range, the PLC controller restarts the vibrating feeder and the equipment continues to operate normally.

[0007] Preferably, the high current threshold and the low current threshold of the working interval need to be preset according to the operating status of the equipment.

[0008] Preferably, the high current threshold is set to the rated current value of the motor, and the low current threshold is set to a value slightly lower than the current value when the motor is running at normal load.

[0009] To sum up, the present invention mainly has the following beneficial effects: the present invention can be effectively applied to the feed matching control system of the electric crushing workstation, and through the control of the vibrating feeder, the overload and blockage of the electric crusher can be reduced, the equipment downtime can be reduced, the effective working time of the equipment can be delayed, and the working efficiency of the equipment can be indirectly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structural framework of the present invention;

[0011] Figure 2 It is a schematic diagram of the control principle of the present invention.

[0012] Figure numerals: 1. Crusher; 2. Current value detection module; 3. PLC controller; 4. Vibrating feeder. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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. 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.

[0014] During normal operation of the crusher workstation, the crusher rotor and plate hammer are driven to rotate by the motor to crush the stone. However, when there is too much crushed material and the load is too large, the vibrating feeder continues to feed, causing the crusher load to continue to increase. When the current of the crusher motor is too large for a long time, it is easy to trigger the overload protection of the equipment, and finally the crusher stops and blocks the material, and the equipment stops running. Before the crusher is shut down and restarted, the material in the crusher needs to be cleaned up. For example, when the material in the crusher is not cleaned, the residual material will be stuck between the crusher rotor and the impact plate, blocking the rotation of the crusher. In particular, the crusher itself is a device with heavy rotational inertia, which is easy to cause a crusher startup failure. Therefore, before the crusher is restarted, it is necessary to manually carry out the material removal process, move the large material in the crusher out of the crusher, and the small material falls into the main belt, which is time-consuming and labor-intensive, and seriously affects the production efficiency. The present invention is applied to the feed matching control system of the electric crushing workstation. By controlling the vibrating feeder, the overload and blockage of the electric crusher are reduced, the equipment downtime is reduced, the effective working time of the equipment is delayed, and the working efficiency of the equipment is indirectly improved.

[0015] Crusher: Equipment used to crush stones. Vibrating feeder: A device in a crushing station that uses a motor to drive a vibrator to feed block and granular materials from a silo to a crusher evenly and continuously. PLC: A programmable logic controller that stores instructions for performing logical operations, sequential control, timing, counting, and arithmetic operations, and controls various types of mechanical equipment or production processes through digital or analog input and output.

[0016] An electric crushing workstation feed matching control system comprises a crusher 1, a current detection module 2, a PLC controller 3 and a vibrating feeder 4, wherein the crusher 1, the current detection module 2, the PLC controller 3 and the vibrating feeder 4 are connected in sequence; the PLC controller 3 performs logic control and detects the working current of the motor of the crusher 1 in real time. When the crusher 1 feeds too much or crushes large-sized stones, the load of the crusher 1 increases and the real-time working current surges; when the real-time working current exceeds the high current threshold value of the normal working range, the control condition is triggered, and the PLC controller 3 stops Stop output, vibrating feeder 4 stops running, after the feed of crusher 1 is reduced, the load no longer increases, the motor avoids overload shutdown, and after the stone part in crusher 1 is processed, the motor load continues to decrease. When the real-time working current of crusher 1 is lower than the low current threshold of the working interval, PLC controller 3 restarts vibrating feeder 4, and the equipment continues to operate normally; the high current threshold and low current threshold of the working interval need to be preset according to the operating status of the equipment; the high current threshold is set to the rated current value of the motor, and the low current threshold setting value is slightly lower than the current value when the motor is running under normal load.

[0017] The equipment operates normally, and the vibrating feeder 4 continuously feeds the material into the crusher 1 for crushing. The current value is output through the current transformer or the soft starter of the crusher, and the real-time current value is transmitted to the corresponding PLC controller. The PLC controller controls the start and stop of the vibrating feeder according to the judgment logic; the judgment logic of the PLC is as follows: Figure 2As shown, the PLC controller 3 first reads the analog signal sent by the current value detection component through its analog input, and converts it into the corresponding current value internally. The converted current value is compared with the upper limit current threshold of the working interval. If the current current value exceeds the upper limit current for 0.5s, it is determined that the current crusher load is heavy and the feed amount needs to be reduced to avoid overloading the crusher. The signal needs to be kept for 0.5s for filtering to prevent the false triggering of the stop feeding function. After the judgment is determined, the PLC controller stops the feeder operation signal, stops the feeder operation, and stops the stone in the feeder from being fed into the crusher. After the feeder stops, continue to read the real-time current of the crusher and compare it with the lower limit current threshold of the working interval. If the current current value remains below the lower limit current for 5s, it is determined that the material in the current crusher has been cleaned up and the load has been reduced, and it is allowed to continue feeding for crushing. After the judgment is determined, the PLC controller starts the feeder operation signal, the feeder restarts, and resumes normal operation. The sensitivity of the system to control the start and stop of the feeder can be achieved by adjusting the upper and lower current thresholds in the working range. Adjusting the upper current threshold to a suitable value can reduce the number of restarts of the vibrating feeder, protect the vibrating feeder motor, and ensure the normal operation of the crusher. Adjusting the lower current threshold to a suitable value can reduce the start and stop interval of the feeder and avoid high-frequency start and stop of the feeder.

[0018] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A feed matching control system for an electric crushing workstation, comprising a crusher (1), characterized in that: It also comprises a current value detection module (2), a PLC controller (3) and a vibrating feeder (4); the crusher (1), the current value detection module (2), the PLC controller (3) and the vibrating feeder (4) are connected in sequence.

2. The feed matching control method of the electric crushing workstation according to claim 1 is characterized in that: The PLC controller (3) performs logic control and detects the working current of the motor of the crusher (1) in real time. When the crusher (1) is fed with too much material or crushes large-sized stones, the load of the crusher (1) increases and the real-time working current surges. When the real-time working current exceeds the high current threshold value of the normal working range, the control condition is triggered, the PLC controller (3) stops outputting, the vibrating feeder (4) stops running, and the load of the crusher (1) stops increasing after the feed is reduced, so the motor stops shutting down due to overload. After the stone material in the crusher (1) is partially processed, the motor load continues to decrease. When the real-time working current of the crusher (1) is lower than the low current threshold value of the working range, the PLC controller (3) restarts the vibrating feeder (4), and the equipment continues to operate normally.

3. The feed matching control method of the electric crushing workstation according to claim 1 is characterized in that: The high current threshold and the low current threshold of the working interval need to be preset according to the operating status of the equipment.

4. The feed matching control method of the electric crushing workstation according to claim 1 is characterized in that: The high current threshold is set to the rated current value of the motor, and the low current threshold is set to a value slightly lower than the current value when the motor is running under normal load.

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