Coal chute full detection device

Abstract

The present application relates to a kind of coal chute full coal detection device, including limit switch assembly, magnetic induction plate, spring, placement plate and PLC controller;Limit switch assembly includes the rotary limit switch being installed on placement plate and the mechanical swing arm being arranged in the rotary limit switch pivot;Magnetic induction plate is fixed at the first end of mechanical swing arm;The upper end of spring is fixed at the second end of mechanical swing arm, and the lower end of spring is fixed on placement plate;It further includes electromagnet and cleaning equipment;Electromagnet is located below magnetic induction plate, and electromagnet is powered to attract magnetic induction plate;Cleaning equipment includes electric push rod, electric motor being arranged at the free end of electric push rod and wiping cloth being arranged on the pivot of electric motor;When magnetic induction plate is attracted on electromagnet, and after electric push rod is elongated, the wiping cloth of the cleaning equipment can just be vertically abutted on the surface of magnetic induction plate, and above-mentioned each electronic equipment is cooperatively connected.The present application can automatically clean the coal adhered on magnetic induction plate, and it is convenient to use.

Description

Technical Field

[0001] This invention relates to the field of coal conveying equipment technology, and in particular to a coal hopper full detection device. Background Technology

[0002] In the process of coal production and transportation, the coal hopper is one of the important pieces of equipment for coal loading and unloading. When the coal hopper is full of coal, it is necessary to stop feeding coal into the hopper in time. Based on this, the applicant designed a coal hopper full detection device and filed a patent application on July 23, 2023, with patent application number CN202321994110.5. The device includes a belt conveyor, a coal hopper, a limit switch assembly, a sensing plate, a spring, a placement plate, and a PLC controller. The limit switch assembly includes a rotary limit switch mounted on the placement plate and a mechanical swing arm set on the rotating shaft of the rotary limit switch. The sensing plate is fixed to the first end of the mechanical swing arm. The upper end of the spring is fixed to the second end of the mechanical swing arm, and the lower end of the spring is fixed to the placement plate. The end of the belt conveyor in the direction of movement is located directly above the coal hopper. A notch is provided on the upper side of the coal hopper, and the notch is located directly above the sensing plate. The rotary limit switch and the belt conveyor are electrically connected to the PLC controller. This coal hopper full detection device can promptly determine whether the coal hopper is full and can automatically adjust the start and stop of the belt conveyor to prevent coal overflow from occurring.

[0003] In practical use, it was found that coal (especially damp coal) would adhere to the surface of the sensing plate, preventing it from returning to a horizontal position. This caused the rotary limit switch to continuously output an electrical signal to the PLC controller, making it impossible for the PLC controller to accurately determine whether the coal hopper was full. Therefore, operators needed to periodically clean the coal adhering to the sensing plate, which was quite troublesome.

[0004] Based on this, this solution makes further improvements to the above-mentioned coal hopper full coal detection device technology. Summary of the Invention

[0005] Therefore, in order to address the above problems, this invention proposes a coal hopper full coal detection device that can automatically clean the coal adhering to the magnetic induction plate and is easy to use.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A coal hopper full detection device includes a limit switch assembly, a magnetic induction plate, a spring, a placement plate, and a PLC controller. The limit switch assembly includes a rotary limit switch mounted on the placement plate and a mechanical swing arm disposed on the rotating shaft of the rotary limit switch. The magnetic induction plate is fixed to the first end of the mechanical swing arm. The upper end of the spring is fixed to the second end of the mechanical swing arm, and the lower end of the spring is fixed to the placement plate, so that the mechanical swing arm is in a horizontal state. The rotary limit switch is electrically connected to the PLC controller.

[0008] It also includes electromagnets and cleaning equipment;

[0009] The electromagnet is positioned below the magnetic induction plate. When the mechanical arm swings and the angle between the magnetic induction plate and the horizontal plane reaches θ°, the electromagnet is energized and attracts the magnetic induction plate. The value of θ° is in the range of [10°, 90°].

[0010] The cleaning device includes an electric push rod, an electric motor mounted on the free end of the electric push rod, and a wiping cloth mounted on the shaft of the electric motor. When the electric push rod is retracted, the magnetic induction plate will not touch the cleaning device when it swings. When the magnetic induction plate is attracted to the electromagnet and the electric push rod is extended, the wiping cloth of the cleaning device can just be perpendicularly pressed against the surface of the magnetic induction plate.

[0011] The electromagnet, electric actuator, and electric motor are electrically connected to the PLC controller.

[0012] Furthermore, this also includes cameras and industrial control screens;

[0013] The camera is mounted above the magnetic induction plate, and when the magnetic induction plate is attracted to the electromagnet, the lens of the camera can capture images of the surface of the magnetic induction plate.

[0014] The camera and industrial control screen are electrically connected to the PLC controller.

[0015] Furthermore, this also includes audible and visual alarms;

[0016] The audible and visual alarm is electrically connected to the PLC controller.

[0017] By adopting the aforementioned technical solution, the beneficial effects of the present invention are:

[0018] When this coal hopper full detection device is in use, if the rotary limit switch sends an electrical signal to the PLC controller for an extended period (e.g., continuously for 1 minute), the PLC controller determines that coal is adhering to the magnetic induction plate, preventing it from returning to a horizontal state and requiring immediate cleaning. At this time, the PLC controller energizes the electromagnet to attract and fix the magnetic induction plate, then the cleaning equipment starts to clean the coal adhering to the magnetic induction plate. Specifically, the PLC controller starts the electric motor to rotate the wiping cloth, and the electric push rod extends towards the surface of the magnetic induction plate to clean the coal adhering to it. After cleaning, the electric motor stops rotating, the electric push rod retracts, and finally the electromagnet is de-energized. The magnetic induction plate returns to a horizontal state under the action of the spring. This coal hopper full detection device can automatically clean coal adhering to the magnetic induction plate and is easy to use.

[0019] Furthermore, if the cleaning equipment is still unable to effectively clean the coal adhering to the magnetic induction plate, the PLC controller will activate the audible and visual alarm to notify staff to come to the site for cleaning and maintenance; and the camera will capture images of the magnetic induction plate surface and display them on the industrial control screen for easy viewing by staff. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the coal hopper full coal detection device with the magnetic induction plate in a horizontal state;

[0021] Figure 2 This is a schematic diagram of the structure of the coal hopper full coal detection device, in which the magnetic induction plate is attracted to the electromagnet.

[0022] Figure 3 This is a schematic diagram of the structure of the coal hopper full coal detection device with the electric push rod extended to the point where the wiping cloth rests against the magnetic induction plate;

[0023] Figure 4 This is the circuit connection block diagram of the coal hopper full coal detection device. Detailed Implementation

[0024] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0025] refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 This embodiment provides a coal hopper full coal detection device, including a cleaning device 1, an electromagnet 2, a limit switch assembly 3, a magnetic induction plate 4, a spring 5, a placement plate 6, a camera 7, a PLC controller 8, an audible and visual alarm 9, and an industrial control panel 10.

[0026] The limit switch assembly 3 includes a rotary limit switch 32 mounted on the placement plate 6 and a mechanical swing arm 31 disposed on the rotating shaft of the rotary limit switch 32. When the mechanical swing arm 31 rotates, it drives the rotating shaft of the rotary limit switch 32 (the shaft is not marked in the figure, but those skilled in the art should understand the position of the shaft on the rotary limit switch 32) to rotate synchronously. The magnetic induction plate 4 is fixed to the first end of the mechanical swing arm 31; the upper end of the spring 5 is fixed to the second end of the mechanical swing arm 31, and the lower end of the spring 5 is fixed to the placement plate 6, so that when the magnetic induction plate 4 does not receive coal, the mechanical swing arm 31 is in a horizontal state. The structure of the limit switch assembly 3 mounted on the placement plate 6 is specifically disclosed in a coal hopper full coal detection device disclosed in patent application number CN202321994110.5, and will not be described in detail here. The difference is that in this solution, the magnetic induction plate 4 is magnetic and can be magnetically attracted.

[0027] The electromagnet 2 is positioned below the magnetic induction plate 4. When the mechanical swing arm 31 swings to make the angle between the magnetic induction plate 4 and the horizontal plane reach θ°, the electromagnet 2 is energized and attracts the magnetic induction plate 4. The value of θ° is in the range of [10°, 90°]. In this specific embodiment, preferably, the value of θ° is 30°.

[0028] The cleaning device 1 includes an electric push rod 11, an electric motor 12 disposed at the free end of the electric push rod 11, and a wiping cloth 13 disposed on the rotating shaft of the electric motor 12; the wiping cloth 13 is used to clean the coal off the surface of the magnetic induction plate 4. The wiping cloth 13 is rotated by the rotation of the rotating shaft of the electric motor 12 to achieve the cleaning effect.

[0029] It should be noted that the cleaning device 1 should be positioned so as not to obstruct the coal from falling onto the surface of the magnetic induction plate 4.

[0030] When the electric push rod 11 retracts, the magnetic induction plate 4 will not touch the cleaning device 1 when it swings; when the magnetic induction plate 4 is attracted to the electromagnet 2 and the electric push rod 11 extends, the wiping cloth 13 of the cleaning device 1 can just be perpendicular to the surface of the magnetic induction plate 4 as the electric push rod 11 extends.

[0031] The camera 7 is installed above the magnetic induction plate 4. When the magnetic induction plate 4 is attracted to the electromagnet 2, the lens of the camera 7 can capture the surface image of the magnetic induction plate 4 and transmit it to the PLC controller 8, and display the surface image of the magnetic induction plate 4 on the industrial control screen 10.

[0032] The installation locations of the PLC controller 8, the audible and visual alarm 9, and the industrial control panel 10 are not limited, but should conform to the principle of convenient installation and use.

[0033] The electromagnet 2, camera 7, sound and light alarm 9, industrial control panel 10, electric push rod 11, electric motor 12, and rotary limit switch 32 are electrically connected to the PLC controller 8.

[0034] The electromagnet 2, camera 7, PLC controller 8, audible and visual alarm 9, industrial control panel 10, electric actuator 11, electric motor 12, and rotary limit switch 32 mentioned above are all existing electronic devices. Those skilled in the art can reproduce this coal hopper full coal detection device and achieve the same technical effect after a limited number of circuit connection experiments.

[0035] The working principle of this coal hopper full coal detection device is as follows:

[0036] If the rotary limit switch 32 sends an electrical signal to the PLC controller 8 for an extended period of time (e.g., 1 minute), the PLC controller 8 will determine that coal is adhering to the magnetic induction plate 4 and needs to be cleaned off promptly.

[0037] At this time, the PLC controller 8 controls the electric motor 12 to start and drive the wiping cloth 13 to rotate, and the electric push rod 11 extends to approach the surface of the magnetic induction plate 4 to clean the coal adhering to the surface of the magnetic induction plate 4; when the cleaning is completed, the electric motor 12 stops rotating, the electric push rod 11 retracts, and finally the electromagnet 2 is de-energized, and the magnetic induction plate 4 returns to a horizontal state under the action of the spring 5.

[0038] If the cleaning equipment 1 is still unable to effectively clean the coal adhering to the magnetic induction plate 4, the PLC controller 8 will control the sound and light alarm 9 to start, notifying the staff to come to the site for cleaning and maintenance; and the camera 7 will capture the image of the surface of the magnetic induction plate 4 and display it on the industrial control screen 10 for the staff to view.

[0039] This coal hopper full coal detection device can automatically clean the coal adhering to the magnetic induction plate and is easy to use.

[0040] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art will understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A coal hopper full detection device, comprising a limit switch assembly, a magnetic induction plate, a spring, a placement plate, and a PLC controller; the limit switch assembly includes a rotary limit switch mounted on the placement plate and a mechanical swing arm disposed on the rotating shaft of the rotary limit switch; the magnetic induction plate is fixed to the first end of the mechanical swing arm; the upper end of the spring is fixed to the second end of the mechanical swing arm, and the lower end of the spring is fixed to the placement plate, so that the mechanical swing arm is in a horizontal state; the rotary limit switch is electrically connected to the PLC controller. Its features are: It also includes electromagnets and cleaning equipment; The electromagnet is positioned below the magnetic induction plate. When the mechanical arm swings and the angle between the magnetic induction plate and the horizontal plane reaches θ°, the electromagnet is energized and attracts the magnetic induction plate. The value of θ° is in the range of [10°, 90°]. The cleaning device includes an electric push rod, an electric motor mounted on the free end of the electric push rod, and a wiping cloth mounted on the shaft of the electric motor. When the electric push rod is retracted, the magnetic induction plate will not touch the cleaning device when it swings. When the magnetic induction plate is attracted to the electromagnet and the electric push rod is extended, the wiping cloth of the cleaning device can just be perpendicularly pressed against the surface of the magnetic induction plate. The electromagnet, electric push rod, and electric motor are electrically connected to the PLC controller. When in use, if the rotary limit switch continuously sends an electrical signal to the PLC controller, the PLC controller will determine that coal is adhering to the magnetic induction plate and needs to be cleaned off in time. At this time, the PLC controller controls the electric motor to start and drive the wiping cloth to rotate, and the electric push rod extends to approach the surface of the magnetic induction plate to clean the coal adhering to the surface of the magnetic induction plate. Once cleaning is complete, the electric motor stops rotating, the electric push rod retracts, the electromagnet is de-energized, and the magnetic induction plate returns to a horizontal state under the action of the spring.

2. The coal hopper full detection device according to claim 1, characterized in that: It also includes cameras and industrial control screens; The camera is mounted above the magnetic induction plate, and when the magnetic induction plate is attracted to the electromagnet, the lens of the camera can capture images of the surface of the magnetic induction plate. The camera and industrial control screen are electrically connected to the PLC controller.

3. The coal hopper full detection device according to claim 2, characterized in that: It also includes audible and visual alarms; The audible and visual alarm is electrically connected to the PLC controller.

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