A coal gas blower rotating speed measurement early warning device
By installing three sets of speed probes on the gas blower and linking them with the safety barrier of the shielding layer and transmitter, the problem of poor anti-interference of the gas blower speed measuring device in a strong electric environment is solved, achieving accurate measurement and timely shutdown protection, ensuring production safety and economy.
Patent Information
- Application Number
- CN202522303967.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-30
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-10-30
AI Technical Summary
Existing gas blower speed measuring devices have poor anti-interference capabilities in high-voltage circuit and equipment environments, resulting in inaccurate measurements and a lack of early warning measures, which affects production safety and economy.
A safety barrier is used, which connects three sets of speed probes to a shielding layer and a transmitter. Through a PLC controller, it is linked with a flashing alarm and an electric bell to achieve accurate measurement of speed signals and alarm for abnormalities, enabling timely shutdown protection.
It improves the anti-interference and accuracy of speed measurement, ensures production safety, reduces downtime accidents, and reduces economic losses.
Smart Images
Figure CN224682252U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of equipment monitoring technology, specifically to a gas blower speed measurement and early warning device. Background Technology
[0002] Coke oven gas blowers are specialized power equipment used in the coke oven gas purification process for conveying and pressurizing the gas. By drawing gas, the blower creates suction in the gas pipeline upstream of the blower, maintaining the pressure in the coke oven gas collecting pipe between 80 and 120 Pa, preventing smoke from the coke oven or the intake of air that could burn the gas. The raw gas escaping from the coke oven carbonization chamber must pass through long gas pipelines and a series of gas purification devices. The blower, as the power source, overcomes the resistance of these pipelines and equipment, maintaining sufficient residual gas pressure and ensuring stable gas network pressure. In summary, coke oven gas blowers play a crucial role in coking plants, ensuring effective gas delivery, stable pressure, and the correct and normal operation of the system. Currently, most domestic coking plants install single-set speed measuring instruments to monitor the operating speed of gas blowers. Speed monitoring equipment is installed on the production site and various motors, mostly in harsh electromagnetic environments created by high-voltage circuits and equipment. Lacking shielding against external interference, it cannot achieve accurate measurement. Furthermore, there are no safety measures in place to warn of abnormal speeds or control the gas blower to stop rotating, seriously affecting the economic efficiency and safe production of large units. A shutdown accident would paralyze the entire production system. Utility Model Content
[0003] This utility model provides a gas blower speed measurement and early warning device to solve the problems of poor anti-interference of speed measurement and early warning devices, which leads to inaccurate measurement and lack of early warning and gas blower shutdown measures.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: A gas blower speed measurement and early warning device includes a protection device box and a blower support. A first speed probe, a second speed probe, and a third speed probe are spaced apart on the blower support, all facing a gear. The first speed probe is connected to a first transmitter inside the protection device box via a first cable, and the first transmitter is connected to a first safety barrier. The second speed probe is connected to a second transmitter inside the protection device box via a second cable, and the second transmitter is connected to a second safety barrier. The third speed probe is connected to a third transmitter inside the protection device box via a third cable, and the third transmitter is connected to a third safety barrier. The first, second, and third safety barriers are all connected to a PLC controller, and the PLC controller is also connected to a flashing alarm.
[0005] Furthermore, the flashing alarm is connected to an electric bell, a test button, and a confirmation button.
[0006] Furthermore, the first, second, and third safety barriers use NPEXA-CA type current detection safety barriers with one input and three outputs, and each outputs one 4-20mA current signal to the PLC controller, and then outputs two relay contact signals to the input of the flashing alarm.
[0007] Furthermore, the first, second, and third transmitters are RS9511 speed signal conditioners.
[0008] Furthermore, the first, second, and third shielding layers are protective layers against external electromagnetic interference for the first, second, and third cables, and are made of copper wire mesh.
[0009] This utility model has the following beneficial effects: This device converts the gear's rotational speed into an electrical signal using three speed probes. It utilizes a shielding layer and a protective enclosure to reduce environmental signal interference and improve the detection equipment's anti-interference capability. The shielding layer is connected to the transmitter and safety barriers within the protective enclosure via cables. Multiple safety barriers are connected to a PLC controller, a flashing alarm, and an electric bell. When an abnormal rotational speed is detected, the flashing alarm will light up and the electric bell will sound. When the PLC controller receives at least two over-limit signals from the probes for 1-3 seconds, it will issue a chain stop signal, controlling the gas blower to stop operating. This meets the requirements for accurate and safe monitoring and reduces economic losses. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0011] The meanings of the reference numerals in the attached figures are as follows: 1. First speed probe; 2. Second speed probe; 3. Third speed probe; 4. First cable; 5. Second cable; 6. Third cable; 7. First transmitter; 8. Second transmitter; 9. Third transmitter; 10. First shielding layer; 11. Second shielding layer; 12. Third shielding layer; 13. First safety barrier; 14. Second safety barrier; 15. Third safety barrier; 16. Flashing alarm; 17. PLC controller; 18. Electric bell; 19. Test button; 20. Confirmation button; 21. Protection device box; 22. Gear; 23. Blower support. Detailed Implementation
[0012] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0013] like Figure 1As shown, a gas blower speed measurement and early warning device includes a protection device box 21 and a blower support 23. A first speed probe 1, a second speed probe 2, and a third speed probe 3 are spaced apart on the blower support 23, and are all positioned directly opposite a gear 22. The first speed probe 1 is connected to a first transmitter 7 inside the protection device box 21 via a first cable 4. The first transmitter 7 is connected to a first safety barrier 13. The second speed probe 2 is connected to a second transmitter 8 inside the protection device box 21 via a second cable 5. The second transmitter 8 is connected to a second safety barrier 14. The third speed probe 3 is connected to a third transmitter 9 inside the protection device box 21 via a third cable 6. The third transmitter 9 is connected to a third safety barrier 15. The first safety barrier 13, the second safety barrier 14, and the third safety barrier 15 are all connected to a PLC controller 17, and the PLC controller 17 is also connected to a flashing alarm 16.
[0014] The flashing alarm 16 is connected to an electric bell 18, a test button 19, and a confirmation button 20.
[0015] In practical use, the operator fixes the first speed probe 1, the second speed probe 2, and the third speed probe 3 onto the mounting bracket, ensuring that they are positioned directly opposite the tooth surface of the gear 22, with a 1mm gap between the probes and the tooth surface. The mounting axis of the first speed probe 1 should be within a 30° range clockwise from the X-axis, the mounting axis of the second speed probe 2 should be within a 52.5° range clockwise from the mounting axis of the first speed probe 1, and the mounting axis of the third speed probe 3 should be within a 75° range clockwise from the mounting axis of the second speed probe 2. Then, the first speed probe 1, the second speed probe 2, and the third speed probe 3 are sequentially connected to the first shielding layer 10, the second shielding layer 11, and the third shielding layer 12. The shielding layer 12 is connected and connected to the first transmitter 7, the second transmitter 8, and the third transmitter 9 in the protection device box 21 via the first cable 4, the second cable 5, and the third cable 6. The first transmitter 7, the second transmitter 8, and the third transmitter 9 in the protection device box 21 are connected to the first safety barrier 13, the second safety barrier 14, and the third safety barrier 15 respectively via signal lines. The safety barriers output a 4-20mA current signal to the PLC controller. The safety barriers then output two relay contact signals to the input terminal of the flashing alarm 16. The input channel of the flashing alarm 16 is connected to the alarm output channel of the safety barriers 13, 14, and 15 respectively, and the other end is connected to the electric bell 18, the test button 19, and the confirmation button 20 respectively. When the flashing alarm 16 is turned on, the electric bell 18 is also turned on.
[0016] After installation, press the test button 19 to confirm that the flashing alarm 16 illuminates and the electric bell 18 sounds. After verifying that the alarm equipment is normal, press the confirmation button 20 to turn off the test button 19. The gear 22 rotates with the blower, converting the rotation speed into an electrical signal. This signal is detected by the first speed probe 1, the second speed probe 2, and the third speed probe 3, and transmitted through the first cable 4, the second cable 5, and the third cable 6 to the first transmitter 7, the second transmitter 8, and the third transmitter 9. The transmitters then transmit the signal to the first safety barrier 13, the second safety barrier 14, and the third safety barrier 15, and finally output the electrical signal to the PLC controller 17.
[0017] When the rotation speed is abnormal, the PLC controller 17 will control the flashing alarm 16 to light up and the electric bell 18 to sound, realizing an audible and visual alarm. When the PLC controller 17 receives signals from at least two probes that exceed the trip limit for 1-3 seconds, the PLC controller 17 will issue a chain stop signal, ultimately controlling the gas blower to stop running, which can avoid serious equipment accidents, reduce the number of downtimes, and reduce economic losses.
Claims
1. A gas blower speed measurement and early warning device, comprising a protection device box (21) and a blower support (23), wherein a first speed probe (1), a second speed probe (2) and a third speed probe (3) are spaced apart on the blower support (23), and all are arranged opposite to the gear (22), characterized in that: The first speed probe (1) is connected to the first transmitter (7) in the protection device box (21) via the first cable (4). The first transmitter (7) is connected to the first safety barrier (13). The second speed probe (2) is connected to the second transmitter (8) in the protection device box (21) via the second cable (5). The second transmitter (8) is connected to the second safety barrier (14). The third speed probe (3) is connected to the third transmitter (9) in the protection device box (21) via the third cable (6). The third transmitter (9) is connected to the third safety barrier (15). The first safety barrier (13), the second safety barrier (14) and the third safety barrier (15) are all connected to the PLC controller (17). The PLC controller (17) is also connected to a flashing alarm (16).
2. The gas blower speed measurement and early warning device according to claim 1, characterized in that: The flashing alarm (16) is connected to an electric bell (18), a test button (19), and a confirmation button (20).