A coal feeder speed measuring device

Abstract

The present invention discloses a coal feeder speed measuring device, which mainly relates to the field of thermal power generation. It comprises a transmission shaft, a dial plate is provided on the transmission shaft, a collar is provided on the transmission shaft, the dial plate is located inside the collar, a mounting groove is provided radially on one side of the collar and penetrates the collar, a spherical head component that can be pushed by the dial plate is provided at one end of the mounting groove close to the transmission shaft, a vibrating plate is provided at one end of the mounting groove away from the transmission shaft, a first spring is provided between the spherical head component and the vibrating plate, a vibration detector is provided on the outside of the vibrating plate, a limit ring is provided on one end of the transmission shaft away from the coal feeder motor, and a base is provided at the bottom of the limit ring. The beneficial effect of the present invention is that the device for measuring the speed is arranged outside the coal bunker, is not directly connected to the motor, and the speed data is obtained indirectly through the vibration frequency, thus avoiding the phenomenon of tripping of the traditional installation measurement method after being affected by the outside, and improving the accuracy of the measurement result.

Description

Technical Field

[0001] The invention relates to the field of thermal power generation, in particular to a coal feeder rotation speed measuring device. Background Art

[0002] The reliability of coal feeder operation directly affects the combustion stability of the entire unit and the overall operation safety of the unit. Therefore, it is particularly important to improve the safety of coal feeder operation and reduce the number of false tripping of coal feeder. As a maintenance professional, we must discover hidden dangers, conduct technical research, and improve the reliability of coal feeder operation to ultimately solve the problem.

[0003] Through on-site observation of the actual operation of the equipment, since the motor speed is an important parameter for calculating the coal feeding rate, the stability of this parameter directly affects the stability of the coal feeder operation. Therefore, a speed measuring device will be installed at the motor on site.

[0004] However, the existing magnetic resistance probe for measuring the rotational speed is installed on the fan cover of the coal feeder belt motor. Due to the usual motor maintenance, the installation accuracy of the rear cover, the strength of the motor cover itself, and the cross-operation of personnel during operation, the installation gap of the coal feeder speed probe changes, making the coal feeder speed measurement result inaccurate. In addition, the speed measuring probe is easily affected by external influences such as the vibration of the motor cap, the cross-operation of maintenance personnel, and the sanitation cleaning of equipment by on-site cleaning personnel, which greatly increases the risk of coal feeder tripping during operation. Summary of the invention

[0005] The purpose of the present invention is to provide a coal feeder speed measuring device, which arranges the speed measuring device outside the coal bin, is not directly connected to the motor, and obtains the speed data indirectly through the vibration frequency, thereby avoiding the phenomenon of tripping caused by external influences in the traditional installation measurement method, and improving the accuracy of the measurement results.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] A coal feeder speed measuring device comprises a transmission shaft that passes through a coal bin and is connected to a coal feeder motor, the transmission shaft is provided with a paddle plate, the transmission shaft is outerly provided with a collar, the paddle plate is located in the collar, a first support rod is provided at the bottom of the collar, a mounting groove that penetrates the collar is radially provided on one side of the collar, a spherical head component that can be pushed by the paddle plate is provided at one end of the mounting groove close to the transmission shaft and a vibrating plate is provided at one end of the mounting groove away from the transmission shaft, a first spring is provided between the spherical head component and the vibrating plate, a vibration detector is provided on the outside of the vibrating plate, the vibration detector is connected to the first support rod through a connecting component, a limiting ring is provided at one end of the transmission shaft away from the coal feeder motor, a second support rod is provided at the bottom of the limiting ring, and a base is provided at the bottom of the second support rod.

[0008] Furthermore, the spherical head component is hemispherical, the spherical head of the spherical head component faces the transmission shaft, and a vibration rod is provided on the side of the spherical head component away from the transmission shaft, and the end of the vibration rod can hit the vibration plate.

[0009] Furthermore, there are multiple limit rods in a circular array on the limit ring, and the multiple limit rods all penetrate the limit ring and are slidably connected to the limit ring. The multiple limit rods are provided with an arc plate at one end located in the limit ring. The multiple arc plates can be spliced ​​into a circular ring, and the transmission shaft is clamped by the multiple arc plates. The multiple limit rods are each covered with a second spring, and the second spring is located between the arc plate and the limit ring.

[0010] Furthermore, a support plate is provided between the base and the second support rod, a plurality of guide rods penetrating the support plate and slidably connected to the support plate are provided on the base, and a plurality of third springs are provided between the bottom of the support plate and the base.

[0011] Furthermore, the base is threadedly connected with a plurality of screw rods having the same number as the third springs, the screw rods penetrate through the surface of the base and a support plate is provided, and the bottom of the third spring is arranged on the corresponding support plate.

[0012] Furthermore, the surface of the support plate and the bottom of the support plate are both provided with limiting columns, and the end of the third spring is sleeved outside the limiting column.

[0013] Furthermore, the shift plate includes a fixed shell fixedly connected to the transmission shaft, a movable plate is slidably connected inside the fixed shell, and the side of the movable plate away from the transmission shaft passes through the fixed shell and can shift the spherical head component, and a fourth spring is provided between one side of the movable plate located inside the fixed shell and the bottom of the fixed shell.

[0014] Furthermore, the connecting component is a gooseneck.

[0015] Furthermore, the first support rod and the second support rod are both electric push rods.

[0016] Furthermore, the elastic force of the fourth spring is greater than that of the first spring.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] A transmission shaft is set to pass through the coal bunker and be connected with the coal feeder motor. The speed of the transmission shaft is the speed of the coal feeder motor. A collar is arranged outside the transmission shaft. A paddle is arranged on the transmission shaft inside the collar. The paddle pushes the spherical head component according to the rotation law of the transmission shaft, pushes the spherical head component into the installation groove and squeezes the first spring, so that the vibration of the spherical head component by the paddle is transmitted to the vibration plate through the first spring, and then the vibration of the vibration plate is detected by the vibration detector, and the speed of the coal feeder motor is converted according to the vibration frequency and the circumference of the transmission shaft. Compared with the traditional speed measuring probe installed on the motor cover, the present invention The speed measuring device is arranged outside the coal bunker, which will not affect the normal operation of the motor and does not require modification of the structure of the motor, thus avoiding tripping caused by external factors such as vibration of the motor cap, cross-operation of maintenance personnel, and cleaning of equipment by on-site cleaning personnel. The present invention indirectly obtains the motor speed by measuring the vibration frequency. Compared with traditional speed measuring probes, this overcomes the defect of measurement error of the speed probe caused by problems such as the installation accuracy of the rear cover, the strength of the motor cover itself, and cross-operation of personnel during operation, so that the measurement result is more accurate, thereby improving the safety and stability of the coal feeder operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attached Figure 1 It is an overall assembly diagram of the present invention.

[0020] Attached Figure 2 It is a structural schematic diagram of the present invention.

[0021] Attached Figure 3 It is a side structural sectional view of the sleeve ring of the present invention.

[0022] Attached Figure 4 It is a side structural sectional view of the limiting ring of the present invention.

[0023] Attached Figure 5 It is a side structural sectional view of the base of the present invention.

[0024] Attached Figure 6 This invention is attached Figure 3 Enlarged view of part A in the middle.

[0025] Attached Figure 7 This invention is attached Figure 3 Enlarged view of part B in the middle.

[0026] Numbers shown in the accompanying drawings:

[0027] 1. Transmission shaft; 2. Switch plate; 3. Ring; 4. First support rod; 5. Mounting groove; 6. Spherical head component; 7. Vibrating plate; 8. First spring; 9. Vibration detector; 10. Connecting component; 11. Limiting ring; 12. Second support rod; 13. Base; 14. Vibrating rod; 15. Limiting rod; 16. Arc plate; 17. Second spring; 18. Support plate; 19. Guide rod; 20. Third spring; 21. Screw; 22. Support plate; 23. Limiting column; 24. Fixed shell; 25. Movable plate; 26. Fourth spring; 27. Coal bunker. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the application equally.

[0029] The present invention discloses a coal feeder speed measuring device, the main structure of which includes a transmission shaft 1 that passes through a coal bunker 27 and is connected to a coal feeder motor, the transmission shaft 1 passes through the coal bunker 27 and is rotatably connected to the wall of the coal bunker 27 through a bearing, a paddle plate 2 is provided on the transmission shaft 1, the length direction of the paddle plate 2 is parallel to the axial direction of the transmission shaft 1, a collar 3 is provided on the outer sleeve of the transmission shaft 1, the paddle plate 2 is located in the collar 3, a first support rod 4 is provided at the bottom of the collar 3, a certain height of support is achieved by the first support rod 4, so that the collar 3 is sleeved outside the transmission shaft 1, a mounting groove 5 that passes through the collar 3 is radially provided on one side of the collar 3, a spherical head component 6 that can be pushed by the paddle plate 2 is provided at one end of the mounting groove 5 close to the transmission shaft 1, the spherical head component 6 can protrude a part of the mounting groove 5, so that the spherical head component 6 can be pushed into the mounting groove 5 when the paddle plate 2 passes, and the spherical shape also makes it easier for the paddle plate 2 to be pushed, and the mounting groove 5 is far away from the transmission shaft A vibration plate 7 is provided at one end of 1, a first spring 8 is provided between the spherical head component 6 and the vibration plate 7, a vibration detector 9 is provided on the outer side of the vibration plate 7, the spherical head component 6 is pushed and squeezed by the first spring 8, so that the vibration generated by the spherical head component 6 pushed by the paddle 2 is transmitted to the vibration plate 7 through the first spring 8, the vibration is received by the probe of the vibration detector 9 and the frequency of the vibration is measured, each time the spherical head component 6 is pushed, it will be reset under the action of the first spring 8 so that it can be pushed by the paddle 2 next time, the vibration detector 9 is connected to the first support rod 4 through the connecting component 10, the end of the transmission shaft 1 away from the coal feeder motor is sleeved with a limit ring 11, the bottom of the limit ring 11 is provided with a second support rod 12, the bottom of the second support rod 12 is provided with a base 13, the limit ring 11 plays a certain supporting and limiting role on the end of the transmission shaft 1, to prevent the large-scale vibration of the end of the transmission shaft 1 from affecting the measurement of the vibration detector 9,

[0030] After the transmission shaft 1, the collar 3, the limit ring 11 and other components are installed, the collar 3 and the limit ring 11 are adjusted to be concentric with the transmission shaft 1, and the coal feeder is started, so that the motor drives the transmission shaft 1 to rotate, and the transmission shaft 1 drives the paddle 2 to rotate, so that the paddle 2 pushes the spherical head component 6 at a certain frequency, and the spherical head component 6 is pushed and moves into the installation groove 5 and squeezes the first spring 8. At this time, the vibration generated by the paddle 2 pushing and hitting the spherical head component 6 is transmitted to the vibration plate 7 through the first spring 8, and the vibration frequency of the vibration plate 7 is measured by the probe of the vibration detector 9, and the number of vibrations of the vibration plate 7 per second is measured, and then the speed of the motor is indirectly measured according to the cross-sectional circumference of the transmission shaft 1. For example, the cross-sectional circumference of the transmission shaft 1 is 0.5m, and the measured vibration frequency is 1 time per second. Therefore, it is known that the speed of the motor is 0.5m / s, and there is no need to modify the structure of the motor, which effectively avoids tripping caused by external influences, overcomes the requirements of traditional speed measuring probes on installation clearance, and makes the measurement result more accurate.

[0031] Preferably, the spherical head component 6 is hemispherical, and the spherical head of the spherical head component 6 faces the transmission shaft 1 and protrudes a portion of the mounting groove 5, so that the paddle plate 2 can squeeze and push the spherical head component 6 along the spherical surface. A vibration rod 14 is provided on the side of the spherical head component 6 away from the transmission shaft 1, that is, on the hemispherical plane. The end of the vibration rod 14 can hit the vibration plate 7. The vibration intensity generated each time the spherical head component 6 is pushed is increased by hitting the vibration plate 7 with the vibration rod 14, so that the vibration can be more easily detected by the vibration detector 9, thereby further ensuring the accuracy of the measurement data.

[0032] Preferably, the limiting ring 11 has a plurality of limiting rods 15 in a circular array, and the plurality of limiting rods 15 all penetrate the limiting ring 11 and are slidably connected to the limiting ring 11. The plurality of limiting rods 15 are each provided with an arc plate 16 at one end located in the limiting ring 11. The plurality of arc plates 16 can be spliced ​​into a circular ring, and the transmission shaft 1 is clamped by the plurality of arc plates 16. The inner diameter of the circular ring spliced ​​by the plurality of arc plates 16 is smaller than the diameter of the transmission shaft 1, so as to ensure that the arc plate 16 clamps the transmission shaft 1 firmly. The plurality of limiting rods 15 are each covered with a second spring 17. The second spring 17 is located between the side of the arc plate 16 away from the transmission shaft 1 and the inner wall of the limiting ring 11. A stopper is provided at one end of the limiting rod 15 outside the limiting ring 11 to prevent the limiting rod 15 from falling off. After the transmission shaft 1 is inserted between multiple arc plates 16, the arc plate 16 firmly clamps the transmission shaft 1 through the elastic force of the second spring 17 to avoid large shaking of the end of the transmission shaft 1 and ensure the accuracy of vibration detection. At the same time, the elastic force of the second spring 17 can play a certain shock-absorbing role to prevent the vibration of the end of the transmission shaft 1 from affecting the normal operation of the motor.

[0033] Preferably, a support plate 18 is further provided between the base 13 and the second support rod 12, and guide rods 19 are respectively provided at the four corners of the base 13, which penetrate the support plate 18 and are slidably connected to the support plate 18. The guide rods 19 limit the support plate 18 to slide up and down but not horizontally. Third springs 20 are respectively provided between the four corners of the bottom of the support plate 18 and the base 13. The third spring 20 and the support plate 18 that can slide up and down play a vertical buffering and shock absorbing role for the transmission shaft 1, further preventing the end of the transmission shaft 1 from shaking significantly, ensuring the accuracy of vibration detection, and preventing the vibration at the end of the transmission shaft 1 from affecting the normal operation of the motor.

[0034] Preferably, the base 13 is threadedly connected with 4 screws 21, the number of which is the same as the third spring 20. The screw 21 passes through the surface of the base 13 and is provided with a support plate 22. The bottom of the third spring 20 is arranged on the corresponding support plate 22. According to the principle that the shorter the spring is compressed, the greater the rebound force is, the height of the support plate 22 is adjusted by rotating the screw 21 to adjust the distance between the support plate 22 and the support plate 18, so as to adjust the compression amplitude of the third spring 20 and thus adjust the magnitude of the rebound force of the third spring 20. When the end of the transmission shaft 1 shakes differently due to different motor speeds, the magnitude of the elastic force of the third spring 20 can be adjusted by changing the compression amplitude of the third spring 20, so as to more specifically play a role in buffering and shock absorbing the end of the transmission shaft 1, and under the action of the transmission shaft 1 and the spring elastic force, the change in the compression amplitude of the third spring 20 will not cause a change in the height of the support plate 18.

[0035] Preferably, a limit column 23 is provided on the surface of the support plate 22 and the bottom of the support plate 18, and the end of the third spring 20 is sleeved outside the limit column 23, which serves as a limit installation for the third spring 20, preventing the third spring 20 from popping out from between the support plate 22 and the bottom of the support plate 18 during the squeezing process, thereby ensuring the normal use of the equipment.

[0036] Preferably, the shift plate 2 includes a fixed shell 24 fixedly connected to the transmission shaft 1, and a movable plate 25 is slidably connected in the fixed shell 24. The movable plate 25 can shift the spherical head component 6 after the side away from the transmission shaft 1 penetrates the fixed shell 24, and a fourth spring 26 is provided between the side of the movable plate 25 located in the fixed shell 24 and the bottom of the fixed shell 24, so that the height of the shift plate 2 can be changed, and the coaxiality requirement between the collar 3 and the transmission shaft 1 can be reduced, even if the distances between various points in the collar 3 and the outer surface of the transmission shaft 1 are different. Under the action of the movable plate 25 and the fourth spring 26, that is, at a position with a small distance, the movable plate 25 is pushed into the fixed shell 24 and squeezes the fourth spring 26. When it is rotated to a position with a large distance, the fourth spring 26 can also pop the movable plate 25 out of the fixed shell 24, ensuring that the paddle 2 can always rotate in the collar 3 and push the spherical head component 6. The elastic force of the fourth spring 26 is greater than the first spring 8, so that the movable plate 25 can push the spherical head component 6 instead of being pushed by the spherical head component 6, reducing the installation requirements and making it more convenient to use.

[0037] Preferably, the connecting component 10 is a gooseneck tube, which is convenient for adjusting and fixing the position of the vibration detector 9.

[0038] Preferably, the first support rod 4 and the second support rod 12 are both electric push rods, which facilitate the adjustment of the height of the limit ring 11 and the sleeve ring 3, can be adapted to the installation requirements of motors at different heights, and are more flexible and convenient to use.

[0039] Compared with the traditional speed measuring probe installed on the motor cover, the present invention sets the speed measuring device outside the coal bunker, which will not affect the normal operation of the motor and does not need to modify the structure of the motor, thus avoiding tripping caused by external factors such as motor cap vibration, cross-operation of maintenance personnel and cleaning of equipment by on-site cleaning personnel. In addition, the present invention indirectly obtains the motor speed by measuring the vibration frequency. Compared with the traditional speed measuring probe, it overcomes the defect of measurement error of the speed probe caused by problems such as the installation accuracy of the rear cover, the strength of the motor cover itself and the cross-operation of personnel during operation, so that the measurement result is more accurate, thereby improving the safety and stability of the coal feeder operation.

Claims

1. A coal feeder speed measuring device, characterized in that: The invention comprises a transmission shaft (1) which passes through a coal bunker (27) and is connected to a coal feeder motor, wherein a shift plate (2) is provided on the transmission shaft (1), a collar (3) is provided on the outer cover of the transmission shaft (1), the shift plate (2) is located inside the collar (3), a first support rod (4) is provided at the bottom of the collar (3), a mounting groove (5) which passes through the collar (3) is provided radially on one side of the collar (3), a spherical head component (6) which can be pushed by the shift plate (2) is provided in the mounting groove (5) at one end close to the transmission shaft (1), and the mounting groove (5) A vibration plate (7) is provided at one end of the inner part away from the transmission shaft (1), a first spring (8) is provided between the spherical head component (6) and the vibration plate (7), a vibration detector (9) is provided on the outer side of the vibration plate (7), and the vibration detector (9) is connected to the first support rod (4) via a connecting component (10); a limit ring (11) is sleeved on one end of the transmission shaft (1) away from the coal feeder motor, a second support rod (12) is provided at the bottom of the limit ring (11), and a base (13) is provided at the bottom of the second support rod (12); A support plate (18) is further provided between the base (13) and the second support rod (12); a plurality of guide rods (19) are provided on the base (13) and penetrate the support plate (18) and are slidably connected to the support plate (18); and a plurality of third springs (20) are provided between the bottom of the support plate (18) and the base (13); The base (13) is threadedly connected with a plurality of screw rods (21) having the same number as the third springs (20); the screw rods (21) penetrate through the surface of the base (13); a support plate (22) is provided; and the bottom of the third spring (20) is arranged on the corresponding support plate (22); The spherical head component (6) is hemispherical, the spherical head of the spherical head component (6) faces the transmission shaft (1), and a vibration rod (14) is provided on a side of the spherical head component (6) away from the transmission shaft (1), and the end of the vibration rod (14) can hit the vibration plate (7); The shifting plate (2) comprises a fixed shell (24) fixedly connected to the transmission shaft (1), a movable plate (25) being slidably connected inside the fixed shell (24), and a side of the movable plate (25) away from the transmission shaft (1) passing through the fixed shell (24) to shift the spherical head component (6), and a fourth spring (26) is provided between a side of the movable plate (25) located inside the fixed shell (24) and the bottom of the fixed shell (24).

2. A coal feeder speed measuring device according to claim 1, characterized in that: The limiting ring (11) has a plurality of limiting rods (15) in a circular array, the plurality of limiting rods (15) all penetrate the limiting ring (11) and are slidably connected to the limiting ring (11), one end of the plurality of limiting rods (15) located inside the limiting ring (11) is provided with an arc plate (16), the plurality of arc plates (16) can be spliced ​​into a circular ring, and the transmission shaft (1) is clamped by the plurality of arc plates (16), and the plurality of limiting rods (15) are all covered with a second spring (17), and the second spring (17) is located between the arc plate (16) and the limiting ring (11).

3. The coal feeder speed measuring device according to claim 1, characterized in that: The surface of the support plate (22) and the bottom of the supporting plate (18) are both provided with limiting columns (23), and the end of the third spring (20) is sleeved outside the limiting column (23).

4. The coal feeder speed measuring device according to claim 1, characterized in that: The connecting component (10) is a gooseneck tube.

5. The coal feeder speed measuring device according to claim 1, characterized in that: The first support rod (4) and the second support rod (12) are both electric push rods.

6. The coal feeder speed measuring device according to claim 1, characterized in that: The elastic force of the fourth spring (26) is greater than that of the first spring (8).

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