A powder explosion-proof ultrasonic material level detection system

Abstract

The invention relates to a powder explosion-proof ultrasonic material level detection system, comprising a large cyclone recovery device, the large cyclone recovery device comprising a powder collecting barrel, the top of the powder collecting barrel is provided with an inlet, and the bottom is connected to a powder conveying pipe; a plurality of ultrasonic detection components are arranged on the powder collecting barrel; a plurality of crushing components are arranged on the bottom of the powder collecting barrel; an alarm component is arranged outside the powder collecting barrel; a PLC control system is connected with the ultrasonic detection component, the crushing component and the alarm component, and a delay controller is further arranged between the PLC control system and the alarm component. The invention utilizes the principle that ultrasonic wave propagation speeds are inconsistent in different media to accurately detect the dust content in the powder collecting barrel, the ultrasonic detection component sends corresponding information to the PLC control system, and the PLC controls the crushing component, the humidity sensor and the alarm component to perform corresponding operations, thereby ensuring that too much dust will not accumulate at the bottom of the powder collecting barrel, the entire detection system has high accuracy, and the long-term stability of the large cyclone recovery device is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic dust level detection, and in particular relates to a powder explosion-proof ultrasonic level detection system. Background Art

[0002] According to the requirements of the "Safety Technical Specifications for Dust Removal Systems for Dust Explosion Hazardous Areas" (AQ4273-2016), the first-stage large cyclone recovery system for powder spraying must have a powder delivery pipeline in the barrel separated from the barrel structure, and a semi-enclosed structure with a double-layer pinch valve at the bottom to ensure system isolation at any time period and reduce the risk of fire and explosion.

[0003] In this case, if the amount of powder absorbed by the front process is too large, there will inevitably be some powder accumulation (storage) space at the bottom of the large cyclone equipment in the first-level recovery. Under certain specific conditions, it may cause excessive powder accumulation, posing a major explosion safety hazard, and even affecting the operation of the large cyclone, causing high-frequency vibration of the barrel and equipment failure. These possible reasons for powder accumulation are mainly the following:

[0004] (1) Failure of the powder conveying system at the bottom of the large cyclone;

[0005] (2) The powder quality is poor, with lumps and blocks, which clog the hopper;

[0006] (3) The weather is too humid, causing the powder to stick together and become clogged at the bottom;

[0007] (4) Absorbed tiny foreign matter and blocked the bottom powder conveying system;

[0008] (5) To this end, a material level measuring device needs to be installed at the bottom of the large cyclone to ensure that the powder accumulation at the bottom is controlled within a reasonable range.

[0009] At present, most of the dust removal equipment on the market does not detect the bottom of the large cyclone. The main reasons are: 1. Weak safety awareness, and the large cyclone system is not treated as an integral part of powder dust removal; 2. The existing detection methods have large errors in the detection and processing of plastic powder, and a large number of false alarms occur. Therefore, it is urgent to design a dust level detector that meets the requirements to meet the bottom dust detection needs of large cyclone recovery equipment and ensure its long-term stability. Summary of the invention

[0010] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a powder explosion-proof ultrasonic material level detection system that can automatically detect whether there is too much dust accumulation at the bottom of the powder collecting tube, and perform corresponding processing and alarm through a PLC control system, thereby ensuring the good stability of the large cyclone recovery equipment.

[0011] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a powder explosion-proof ultrasonic level detection system, including a large cyclone recovery device, the large cyclone recovery device includes a powder collecting barrel, an inlet is opened at the top of the powder collecting barrel, and a powder conveying pipe is connected to the bottom; it also includes an ultrasonic detection component, a crushing component, an alarm component, a PLC control system and a delay controller; the powder collecting barrel is provided with a plurality of ultrasonic detection components for detecting the dust height at the bottom of the powder collecting barrel and sending the corresponding information to the PLC control system; the bottom end of the powder collecting barrel is provided with a plurality of crushing components for crushing the block powder at the bottom of the powder collecting barrel; the alarm component is arranged on the outside of the powder collecting barrel; the PLC control system is connected to the large cyclone recovery device, the ultrasonic detection component, the crushing component and the alarm component, and a delay controller is also provided between the PLC control system and the alarm component.

[0012] Furthermore, at least two of the ultrasonic detection components are arranged on the top of the powder collecting barrel; the ultrasonic detection component is composed of an ultrasonic sensor and a waveguide rod that are connected to each other; the ultrasonic sensor is arranged at the upper end of the powder collecting barrel, the waveguide rod is inserted into the powder collecting barrel, and the waveguide rod and the ultrasonic sensor are rotatably connected.

[0013] Furthermore, the waveguide rod is a retractable structure.

[0014] Furthermore, multiple cleaning components are provided on both sides of the inner wall of the powder collecting barrel; the cleaning component includes a solenoid valve obliquely arranged on the inner wall of the powder collecting barrel, and the solenoid valve is connected to the PLC control system; a nozzle is provided at the front end of the solenoid valve; and the other end of the solenoid valve is communicated with an external air outlet device.

[0015] Furthermore, it includes at least two of the ultrasonic detection components; the ultrasonic detection component is an ultrasonic sensor module, in which an ultrasonic transmitting module and an ultrasonic receiving module are provided; a plurality of symmetrical transmitting holes are respectively provided at both ends of the powder collecting tube; a clamping piece is provided on the outside of the transmitting hole, an ultrasonic detection component is clamped on the clamping piece, and the front end of the ultrasonic detection component passes through the transmitting hole and points to the bottom of the powder collecting tube.

[0016] Furthermore, the crushing assembly includes a small motor and a rotating rod; the small motor is arranged at the bottom outside the powder collecting barrel, a plurality of rotating rods are connected to the rotating shaft of the small motor, and the rotating rods are arranged at the bottom inside the powder collecting barrel.

[0017] Furthermore, the alarm component includes an alarm and a flashing light; the alarm and the flashing light are connected to a PLC control system.

[0018] Furthermore, it also includes a humidity sensor; a humidity sensor is embedded on the inner wall of the powder collecting tube; the humidity sensor is connected to the PLC control system, the humidity sensor is used to sense the humidity in the powder collecting tube, and display real-time data on a display screen located on the PLC control system through the PLC control system.

[0019] Furthermore, the powder collecting tube is also provided with a transparent observation window.

[0020] Furthermore, the powder conveying pipe is threadedly connected to the powder collecting barrel, and a control valve is provided on the powder conveying pipe, and the control valve is connected to the PLC control system.

[0021] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0022] ①Use the ultrasonic detection component to detect the dust accumulation at the bottom of the powder collecting tube in real time to ensure that it is within the controllable range. If it is not within the controllable range, the alarm component will sound an alarm;

[0023] ② When the dust at the bottom of the powder collecting tube is out of the controllable range, the PLC control system automatically controls the crushing component to start, and the crushing component crushes the block powder in the powder collecting tube to avoid excessive dust accumulation at the bottom of the powder collecting tube;

[0024] ③ The humidity in the powder collecting tube is sensed in real time by the humidity sensor, and the real-time humidity data is displayed on the display screen for easy observation by the user; if the humidity exceeds the humidity range set in the PLC control system, the PLC control system automatically controls the large cyclone recovery device to stop working;

[0025] ④When the powder conveying pipe is blocked, the powder conveying pipe can be directly removed from the bottom of the powder collecting barrel for cleaning, which is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The technical solution of the present invention is further described below in conjunction with the accompanying drawings:

[0027] Attached Figure 1 It is a schematic diagram of the three-dimensional structure of the first embodiment of the present invention;

[0028] Attached Figure 2 This is a schematic diagram of the internal structure of the first embodiment of the present invention after omitting the PLC control system and the delay controller;

[0029] Attached Figure 3 For attachment Figure 2 A partial enlarged view of the

[0030] Attached Figure 4 This is a schematic diagram of the internal structure of the second embodiment of the present invention after omitting the PLC control system and the delay controller;

[0031] Attached Figure 5 For attachment Figure 4 A partial enlarged view of the

[0032] Among them: large cyclone recovery device 1, ultrasonic detection component 2, card connector 3, PLC control system 5, delay controller 6, powder collecting tube 10, inlet 11, powder conveying pipe 12, transparent observation window 13, ultrasonic sensor 20, waveguide rod 21, small motor 30, rotating rod 31, alarm 40, flashing light 41, display screen 70, humidity sensor 71, solenoid valve 100, nozzle 101. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] Please see attached Figure 1-3 , a powder explosion-proof ultrasonic level detection system described in the first embodiment of the present invention includes a large cyclone recovery device 1, which includes a powder collecting barrel 10, an inlet 11 is opened at the top of the powder collecting barrel 10, and a powder conveying pipe 12 is connected to the bottom; it also includes an ultrasonic detection component 2, a crushing component, an alarm component, a PLC control system 5 and a delay controller 6; the powder collecting barrel 10 is provided with a plurality of ultrasonic detection components 2, which are used to detect the dust height at the bottom of the powder collecting barrel 10 and send the corresponding information to the PLC control system 5; the bottom end of the powder collecting barrel 10 is provided with a plurality of crushing components, which are used to crush the block powder at the bottom of the powder collecting barrel 10; the alarm component 4 is arranged on the outside of the powder collecting barrel 10; the PLC control system 5 is connected to the large cyclone recovery device 1, the ultrasonic detection component 2, the crushing component and the alarm component, and a delay controller 6 is also provided between the PLC control system 5 and the alarm component.

[0035] Specifically, in this embodiment, two ultrasonic detection components 2 are arranged on the top of the powder collecting barrel 10, and the two ultrasonic detection components 2 are respectively located on both sides of the inlet 11; the ultrasonic detection component 2 is composed of an ultrasonic sensor 20 and a waveguide rod 21 that are connected to each other; the ultrasonic sensor 20 is arranged at the upper end of the powder collecting barrel 10, and the waveguide rod 21 is inserted into the powder collecting barrel 10, and the waveguide rod 21 and the ultrasonic sensor 20 are rotatably connected, so that the angle of the waveguide rod 21 can also be adjusted to meet the use requirements of different environments. In this embodiment, the waveguide rod 21 and the ultrasonic sensor 20 are vertically connected.

[0036] The waveguide rod 21 is a retractable structure, so that the length of the waveguide rod 21 can be adjusted to meet the use requirements of different lengths.

[0037] The crushing assembly includes a small motor 30 and a rotating rod 31; the small motor 30 is arranged at the bottom outside the powder collecting barrel 10, and multiple rotating rods 31 are connected to the rotating shaft of the small motor 30, and the rotating rods 31 are arranged at the bottom inside the powder collecting barrel 10. The outer surface of the rotating rod 31 is fish scale-shaped, which can effectively improve the crushing efficiency of block dust. In this embodiment, the number of crushing assemblies is four.

[0038] The alarm component includes an alarm 40 and a flashing light 41 ; the alarm 40 and the flashing light 41 are connected to the PLC control system 5 .

[0039] During specific operation, the ultrasonic detection component 2 detects the dust height in the powder collecting barrel 10, the ultrasonic sensor 20 emits ultrasonic waves, and transmits them vertically through the waveguide rod 21, so that the dust height in the powder collecting barrel 10 can be better detected. In this embodiment, two ultrasonic detection components are arranged, and the two ultrasonic detection components are located on both sides. This can avoid the situation where the accumulated dust is high on one side and low on the other side when there is only one ultrasonic component, thereby reducing the detection accuracy, thereby improving the detection accuracy of the ultrasonic detection component.

[0040] A dust height value is pre-set in the PLC control system. After the PLC control system receives the signal sent by the ultrasonic detection component after detection, if the detected dust height is higher than this value, the PLC control system will first control the crushing component to work. At this time, there may be block powder at the bottom of the powder collecting barrel, resulting in excessive dust accumulation. At this time, the small motor starts to work, and its shaft drives multiple rotating rods to rotate, thereby crushing the block powder at the bottom to ensure normal transmission between the powder collecting barrel and the powder conveying pipe; at the same time, the PLC control system sends an alarm signal to the alarm component through the delay controller. When the PLC control system receives the signal sent by the ultrasonic detection component during the delay time, it finds that the dust height has returned to the set range, then the PLC control system sends a signal to the delay controller again, so that the delay controller will no longer send the alarm signal to the alarm component, to ensure that the alarm will not be directly triggered when a problem occurs, and it has the ability to automatically adjust.

[0041] When the alarm 40 and the flashing light 41 receive the signal sent by the delay controller, the alarm 40 emits a sound alarm and the flashing light 41 flashes at the same time, ensuring that personnel can find it in time.

[0042] Among them, multiple cleaning components are also provided on both sides of the inner wall of the powder collecting barrel 10. In this embodiment, two cleaning components are respectively provided on both sides, which are respectively located at the upper and lower parts of the waveguide rod 21; the cleaning component includes a solenoid valve 100 obliquely arranged on the inner wall of the powder collecting barrel 10; a nozzle 101 is provided at the front end of the solenoid valve 100; the other end of the solenoid valve 100 is connected to an external air outlet device (not shown in the figure); in this way, after long-term use, there may be residual dust on the waveguide rod, which makes the data measured by the ultrasonic detection component inaccurate or causes false touches. At this time, the solenoid valve is opened through the PLC control system, so that the gas in the air outlet device is ejected from the nozzle to clean the outer surface of the waveguide rod.

[0043] As a further preferred embodiment, it also includes a humidity sensor 71; a humidity sensor 71 is embedded on the inner wall of the powder collecting barrel 10; the humidity sensor 71 is connected to the PLC control system 5, and the humidity sensor 71 is used to sense the humidity in the powder collecting barrel 10, and display the real-time data on the display screen 70 located on the PLC control system 5 through the PLC control system 5.

[0044] Specifically, in order to prevent dust from agglomerating and condensing in a humid environment, it is necessary to promptly understand the humidity status in the powder collecting barrel. Therefore, a humidity sensor 71 is set on the inner wall of the powder collecting barrel. The humidity sensor 71 is always in an on state to monitor the humidity in the powder collecting barrel in real time and reflect the humidity value on the display screen, so that the user can observe the humidity in the powder collecting barrel at any time; at the same time, a maximum humidity value is also set in the PLC control system. When the humidity range sent by the humidity sensor 71 exceeds the maximum humidity value, the PLC control system automatically controls the large cyclone recovery device to stop working, so as to prevent the internal dust from getting damp and agglomerated and clogging at the bottom of the powder collecting barrel, thereby causing the large rotating recovery device to fail to work.

[0045] As a further preferred embodiment, the powder collecting barrel 10 is further provided with a transparent observation window 13, specifically located in the lower half of the powder collecting barrel 10, so that it is possible to observe in real time whether there is too much dust accumulated at the bottom of the powder collecting barrel 10, so that preventive measures can be taken in advance.

[0046] As a further preferred embodiment, the powder conveying pipe 12 is threadedly connected to the powder collecting barrel 10, and a control valve 120 is provided on the powder conveying pipe 12. When the powder conveying pipe 12 is blocked, the control valve 120 is first closed using the PLC control system, and then the powder conveying tank and the powder collecting barrel are disassembled and both are cleared.

[0047] In addition, please see the attached Figure 4-5The present invention also discloses a second specific embodiment, comprising at least two ultrasonic detection components 2, and in this embodiment, two ultrasonic detection components 2 are also included; symmetrical transmitting holes are respectively provided at both ends of the upper part of the powder collecting tube 10; a clamping piece 3 is provided on the outside of the transmitting hole, and an ultrasonic detection component 2 is clamped on the clamping piece 3, and the front end of the ultrasonic detection component 2 passes through the transmitting hole and points to the bottom of the powder collecting tube 10; the ultrasonic detection component 2 is an ultrasonic sensor module, and an ultrasonic transmitting module and an ultrasonic receiving module are provided in the ultrasonic sensor module.

[0048] Here, the ultrasonic transmitting module in the ultrasonic detection component can directly transmit ultrasonic waves to the bottom of the powder collecting barrel, and then the ultrasonic receiving module receives relevant information and sends it to the PLC control system for corresponding control. The ultrasonic detection component here is closer to the bottom of the powder collecting barrel, and the distance between the ultrasonic detection component and the bottom of the powder collecting barrel is short, so there is no need for a waveguide rod, and the detection accuracy is also high.

[0049] The powder explosion-proof ultrasonic material level detection system of the present invention is applied in a large cyclone recovery device, and utilizes the principle that the propagation speed of ultrasound waves in different media is inconsistent to accurately detect the dust content in a powder collecting barrel. Specifically, the dust content is detected by an ultrasonic detection component, and the corresponding information is sent to a PLC control system, and the PLC control system automatically controls a crushing component, a humidity sensor and an alarm component to perform corresponding operations, thereby ensuring that too much dust does not accumulate at the bottom of the powder collecting barrel. The entire detection system has high accuracy, improves the use stability of the large cyclone recovery device, and has good promotion value.

[0050] The above are only specific application examples of the present invention and do not constitute any limitation on the protection scope of the present invention. Any technical solution formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the present invention.

Claims

1. A powder explosion-proof ultrasonic material level detection system, comprising a large cyclone recovery device, wherein the large cyclone recovery device comprises a powder collecting cylinder, an inlet is opened at the top of the powder collecting cylinder, and a powder conveying pipe is connected to the bottom; characterized in that: It also includes an ultrasonic detection component, a crushing component, an alarm component, a PLC control system and a delay controller; the powder collecting tube is provided with a plurality of ultrasonic detection components for detecting the dust height at the bottom of the powder collecting tube and sending the corresponding information to the PLC control system; the bottom end of the powder collecting tube is provided with a plurality of crushing components for crushing the block powder at the bottom of the powder collecting tube; the alarm component is arranged outside the powder collecting tube; the PLC control system is connected with the large cyclone recovery device, the ultrasonic detection component, the crushing component and the alarm component, and a delay controller is also arranged between the PLC control system and the alarm component; The crushing assembly includes a small motor and a rotating rod; the small motor is arranged at the bottom outside the powder collecting barrel, a plurality of rotating rods are connected to the rotating shaft of the small motor, and the rotating rods are arranged at the bottom inside the powder collecting barrel; A dust height value is pre-set in the PLC control system. After the PLC control system receives the signal sent by the ultrasonic detection component after detection, if the detected dust height is higher than this value, the PLC control system will first control the crushing component to work; at the same time, the PLC control system sends the alarm signal to the alarm component through the delay controller. When the PLC control system receives the signal sent by the ultrasonic detection component during the delay time, it is found that the dust height has returned to the set range, then the PLC control system sends a signal to the delay controller again, so that the delay controller will no longer send the alarm signal to the alarm component.

2. The powder explosion-proof ultrasonic material level detection system according to claim 1 is characterized in that: It comprises at least two ultrasonic detection components arranged on the top of the powder collecting barrel; the ultrasonic detection component is composed of an ultrasonic sensor and a waveguide rod which are connected to each other; the ultrasonic sensor is arranged at the upper end of the powder collecting barrel, the waveguide rod is inserted into the powder collecting barrel, and the waveguide rod and the ultrasonic sensor are rotatably connected.

3. The powder explosion-proof ultrasonic material level detection system according to claim 2 is characterized in that: The waveguide rod is a retractable structure.

4. The powder explosion-proof ultrasonic material level detection system according to claim 2 is characterized in that: A plurality of cleaning components are also provided on both sides of the inner wall of the powder collecting barrel; the cleaning component comprises a solenoid valve obliquely arranged on the inner wall of the powder collecting barrel, the solenoid valve is connected to the PLC control system; a nozzle is provided at the front end of the solenoid valve; the other end of the solenoid valve is communicated with an external air outlet device.

5. The powder explosion-proof ultrasonic material level detection system according to claim 1 is characterized in that: It comprises at least two ultrasonic detection components; the ultrasonic detection component is an ultrasonic sensor module, in which an ultrasonic transmitting module and an ultrasonic receiving module are provided; a plurality of symmetrical transmitting holes are respectively provided at both ends of the powder collecting tube; a clamping piece is provided on the outside of the transmitting hole, on which an ultrasonic detection component is clamped, and the front end of the ultrasonic detection component passes through the transmitting hole and points to the bottom of the powder collecting tube.

6. The powder explosion-proof ultrasonic material level detection system according to claim 1 is characterized in that: The alarm component comprises an alarm and a flashing light; the alarm and the flashing light are connected to a PLC control system.

7. The powder explosion-proof ultrasonic material level detection system according to claim 1, characterized in that; It also includes a humidity sensor; a humidity sensor is embedded on the inner wall of the powder collecting tube; the humidity sensor is connected to the PLC control system, the humidity sensor is used to sense the humidity in the powder collecting tube, and display real-time data on a display screen located on the PLC control system through the PLC control system.

8. The powder explosion-proof ultrasonic material level detection system according to claim 1 is characterized in that: The powder collecting cylinder is also provided with a transparent observation window.

9. The powder explosion-proof ultrasonic material level detection system according to claim 1, characterized in that; The powder conveying pipe is threadedly connected to the powder collecting barrel, and a control valve is arranged on the powder conveying pipe, and the control valve is connected to the PLC control system.

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