A device for detecting the speed difference of dust removal fan

Abstract

This application discloses a detection device for the speed difference of a dust collector fan, relating to the field of dust collector fan technology. The device includes: a first proximity switch located at the tail end of the motor; and a second proximity switch located on the side of the fan casing. A metal block is mounted circumferentially on the motor tail end shaft. The first proximity switch faces the metal block and its axis is parallel to the motor tail end shaft. The second proximity switch faces the fan blades and its axis is parallel to the fan main shaft. The first and second proximity switches detect the operating speeds of the motor and fan in real time. By calculating the actual speed difference between the two, the device determines whether there is belt slippage or loss of rotation between the motor and fan. This allows production personnel to promptly understand the actual operating status of the fan and make timely adjustments to ensure subsequent production.

Description

Technical Field

[0001] This application relates to the field of dust collector fan technology, specifically to a device for detecting the difference in operating speed of a dust collector fan. Background Technology

[0002] Dust collectors are essential equipment in the cigarette manufacturing process. They are crucial for ensuring a clean production environment, protecting the health of employees, and guaranteeing product quality. Their main functions are material conveying and removing dust and impurities generated during production. Slowing down the fan can have several negative impacts. First, for material conveying equipment, a slower fan speed and reduced airflow can cause material buildup in the conveying pipes, leading to blockages and disrupting production continuity. Second, a slower fan speed and reduced airflow can compromise the cleanliness of the work environment, resulting in excessively high dust concentrations and negatively affecting employee health.

[0003] Dust collector fans are driven by motors. In order to monitor the fan speed and make timely adjustments when the fan speed slows down to ensure continuous production, a sensor is usually installed at one end of the motor to detect the motor speed, thereby using the motor speed to characterize the fan speed.

[0004] However, when some dust collector fans and motors are driven by belts, the fans may experience a loss of rotation, resulting in a mismatch between the motor speed and the fan's operating speed. This makes it impossible for production personnel to know the actual operating status of the fans, leading to untimely fan adjustments that affect subsequent production. Utility Model Content

[0005] The main purpose of this application is to provide a detection device for the difference in operating speed of a dust collector fan, which aims to solve the technical problem that the mismatch between the motor speed and the fan speed makes it impossible for production personnel to know the actual operating status of the fan, thus causing the fan to be adjusted in a timely manner and affecting subsequent production.

[0006] To achieve the above objectives, this application provides the following technical solution: A device for detecting the speed difference of a dust collector fan, comprising a motor and a fan, and further comprising: A first proximity switch is located at the tail end of the motor; A second proximity switch is located on the side of the fan casing; The motor tail shaft is fitted with a metal block along its circumference. The first proximity switch is directly opposite the metal block and its axis is parallel to the motor tail shaft. The second proximity switch is directly opposite the fan blades and its axis is parallel to the fan main shaft.

[0007] Optionally, the first proximity switch and the second proximity switch are detachably mounted on the tail end of the motor and the side of the fan volute via mounting bases, respectively. The tail end of the motor and the side of the fan volute are respectively provided with mounting holes that fit into the mounting bases.

[0008] Optionally, the mounting base includes: The first connecting plate has several bolt holes near its outer periphery, and a through hole matching the first proximity switch and the second proximity switch is provided at the center of the first connecting plate. The inner wall of the through hole is provided with an internal thread that engages with the external threads of the first proximity switch and the second proximity switch.

[0009] Optionally, a boss is provided on one side of the first connecting plate, and a groove is provided in the boss. The probe ends of the first proximity switch and the second proximity switch are fixed in the groove by a first nut, and the wiring terminals of the first proximity switch and the second proximity switch are fixed to the side of the first connecting plate away from the boss by a second nut.

[0010] Optionally, the probe end faces of the first proximity switch and the second proximity switch are flush with the end face of the boss away from the first connecting plate.

[0011] Optionally, the boss is provided with a second connecting plate along its outer periphery. The second connecting plate has bolt holes corresponding to the first connecting plate. A rubber gasket is fitted between the first connecting plate and the second connecting plate, and the edge of the boss located between the first connecting plate and the second connecting plate has a first rounded corner.

[0012] Optionally, a rubber pad is embedded in the groove, and the rubber pad has an assembly hole in the middle that matches the first nut, and the first nut has a second rounded corner on the edge perpendicular to the bottom surface of the groove.

[0013] Optionally, the first nut and the second nut are provided with at least two limiting screw holes in their radial directions, and the limiting screw holes are internally threaded with limiting screws. The limiting screws have a pointed end at one axial end and a cross-grooved head at the other end.

[0014] The technical solution provided in this application may include the following beneficial effects: The first and second proximity switches are used to detect the operating speed of the motor and the fan in real time. By calculating the difference between their actual speeds, it can be determined whether there is a slippage or loss of rotation between the belts of the motor and the fan. This allows production personnel to know the actual operating status of the fan in a timely manner and make timely adjustments to ensure subsequent production. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional structural diagram of a device for detecting the speed difference of a dust collector fan. Figure 2 This is a first-person view of the mounting bracket; Figure 3 This is a second-view view of the mounting bracket; Figure 4 This is a structural schematic diagram of the second connecting plate; Figure 5 This is a schematic diagram of the fillet radius of the first nut; Figure 6 This is a schematic diagram of the rubber pad structure; Figure 7 This is a schematic diagram of the limit screw. Figure 8 This is a schematic diagram of the cross-shaped groove head.

[0017] Figure label: 1. Motor; 2. Fan; 3. First proximity switch; 4. Second proximity switch; 5. Mounting base; 6. First connecting plate; 7. Bolt hole; 8. Boss; 9. Groove; 10. First nut; 11. Second nut; 12. Second connecting plate; 13. First fillet; 14. Rubber pad; 15. Second fillet; 16. Limit screw hole; 17. Limit screw; 18. Tip; 19. Cross groove head. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are merely some, not all, of the embodiments of this application. Unless otherwise specified, the embodiments and features described in this application can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0019] Example 1: See Figure 1 A device for detecting the difference in operating speed of a dust collector fan, comprising a motor 1 and a fan 2, and further comprising: The first proximity switch 3 is located at the tail end of the motor 1; The second proximity switch 4 is located on the side of the volute of the fan 2; The motor 1 has a metal block mounted on its tail shaft along its circumference. The first proximity switch 3 is directly opposite the metal block and its axis is parallel to the tail shaft of the motor 1. The second proximity switch 4 is directly opposite the blades of the fan 2 and its axis is parallel to the main shaft of the fan 2.

[0020] Specifically, the first proximity switch 3 is installed at the tail end of the motor 1, with its probe extending into the motor 1 and facing the metal block on the tail shaft. The first proximity switch 3 has non-contact detection capability for the metal block: when the tail shaft of the motor 1 rotates, the metal block on the tail shaft rotates synchronously with the shaft. Each rotation passes the probe of the proximity switch once. At this time, the first proximity switch 3 will trigger a signal transition (such as from "open" to "closed", or from low to high / high to low) due to the proximity of the metal block, outputting a pulse signal. The terminals of the first proximity switch 3 are electrically connected to the controller, allowing the detection signal to be transmitted to the controller, thereby displaying the motor 1 speed, i.e., the running speed of the motor 1, in real time through the controller's display module. The axis of the first proximity switch 3 is parallel to the tail shaft of the motor 1, ensuring that when the metal block rotates to the front of the probe, the surface facing the probe is perpendicular to the sensing direction (axial direction) of the first proximity switch 3, maximizing the effective sensing area of ​​the metal block and reliably triggering the first proximity switch 3.

[0021] The second proximity switch 4 is installed on the side of the volute of the fan 2. Its probe extends into the fan 2 and faces the fan blades. The second proximity switch 4 has a non-contact detection capability for the blades: when the fan blades rotate, each blade passing the proximity switch probe will cause the second proximity switch 4 to output a signal jump (such as a change in level or a switching signal) due to the blade's obstruction or proximity, forming a pulse. The terminals of the second proximity switch 4 are electrically connected to the controller, so that the detection signal is transmitted to the controller, and the fan 2 speed, i.e., the operating speed of the fan 2, is displayed in real time through the controller's display module.

[0022] When some dust collector fans 2 and motors 1 are driven by a belt, fan 2 experiences slippage, causing a mismatch between the speed of motor 1 and the operating speed of fan 2. This makes it impossible for production personnel to know the actual operating status of fan 2, resulting in untimely adjustments to fan 2 and affecting subsequent production. In this embodiment, the display module displays the real-time speed of motor 1, the speed of fan 2, and the speed difference between the two. When the speed difference exceeds a set value, the controller automatically triggers an anti-slip alarm. The first proximity switch 3 can detect the actual operating speed of motor 1 and compare it with the theoretical set speed of the frequency converter to determine the operating status of motor 1. The second proximity switch 4 can detect the actual operating speed of fan 2 and compare it with the actual operating speed of motor 1 to calculate the actual speed difference, thereby determining whether there is a slippage problem between the belt of motor 1 and fan 2. The motor speed, fan speed, and the speed difference between the two can be displayed through the display module, allowing relevant personnel to remotely observe the equipment operation, which is convenient for use.

[0023] In this embodiment, the operating speeds of the motor 1 and the fan 2 are detected in real time by the first proximity switch 3 and the second proximity switch 4. By calculating the actual speed difference between the two, it can be determined whether there is a slippage or loss of rotation of the belt between the motor 1 and the fan 2. This allows production personnel to know the actual operating status of the fan 2 in a timely manner and make timely adjustments to ensure subsequent production.

[0024] Example 2: See Figures 2 to 3 Based on the above embodiments, optionally, the first proximity switch 3 and the second proximity switch 4 are detachably mounted on the tail end of the motor 1 and the side of the volute of the fan 2 via mounting base 5, respectively. The tail end of the motor 1 and the side of the volute of the fan 2 are respectively provided with mounting holes (not shown in the figure) that fit into the mounting base 5.

[0025] Specifically, the mounting base 5 facilitates the addition of anti-vibration measures later. The two mounting bases 5 are detachably mounted to the tail end of the motor 1 and the side of the volute of the fan 2 through mounting holes, respectively. The first proximity switch 3 and the second proximity switch 4 are threaded to the center of the two mounting bases 5, respectively. The double fixation enhances the fixing strength, reduces the positional displacement caused by vibration, and ensures that the probe is always within the effective detection range.

[0026] Optionally, the mounting base 5 includes: The first connecting plate 6 has several bolt holes 7 near its outer periphery. The first connecting plate 6 has a through hole (not shown in the figure) at its axial center that matches the first proximity switch 3 and the second proximity switch 4. The inner wall of the through hole has an internal thread that engages with the external threads of the first proximity switch 3 and the second proximity switch 4.

[0027] Specifically, the proximity switch is detachably connected to the equipment via bolt hole 7, facilitating the removal and replacement of mounting base 5. By screwing the proximity switch into the through hole, the internal and external threads engage, enabling the installation of the first proximity switch 3 and the second proximity switch 4. The tight engagement of the threads firmly secures the proximity switch to the first connecting plate 6, effectively resisting loosening or axial displacement caused by vibration and preventing the probe from deviating from the detection trajectory due to shaking. Simultaneously, the through hole size matches the proximity switch, and the internal thread is machined along the through hole's axis. When the proximity switch is screwed into the through hole, its axis is forcibly aligned with the through hole's axis, ensuring that the proximity switch's axis accurately points to the movement trajectory of the detection target, preventing signal loss due to axis misalignment.

[0028] Optionally, a boss 8 is provided on one side of the first connecting plate 6, and a groove 9 is provided in the boss 8. The probe ends of the first proximity switch 3 and the second proximity switch 4 are fixed in the groove 9 by the first nut 10, and the wiring terminals of the first proximity switch 3 and the second proximity switch 4 are fixed to the side of the first connecting plate 6 away from the boss 8 by the second nut 11.

[0029] Specifically, the proximity switch probe extends beyond the first nut 10 to form a non-embedded probe. This avoids the phenomenon that the metal casing in an embedded probe may absorb or reflect electromagnetic fields, which would reduce the range of the sensing field and thus improve the effective detection distance.

[0030] Furthermore, non-embedded probes are not encased in a metal housing, allowing heat to dissipate directly through the air, reducing probe overheating caused by heat conduction from the housing. If an embedded probe is embedded in a metal housing, slight deformation of the housing due to temperature changes (thermal expansion and contraction) or vibration may create compressive stress on the probe (leading to damage to internal components). Non-embedded probes avoid this compressive stress, extending their lifespan.

[0031] Optionally, the probe end faces of the first proximity switch 3 and the second proximity switch 4 are flush with the end face of the boss 8 away from the first connecting plate 6.

[0032] Specifically, the probe end face is flush with the end face of the protrusion 8 away from the first connecting plate 6, which can avoid mechanical damage caused by "protrusion" and strengthen protection. In addition, it can also avoid the detection performance degradation caused by probe concavity.

[0033] Example 3: See Figure 4Based on the above embodiments, optionally, the boss 8 is provided with a second connecting plate 12 along its outer periphery, the second connecting plate 12 is provided with bolt holes 7 corresponding to the first connecting plate 6, a rubber gasket (not shown in the figure) is sleeved between the first connecting plate 6 and the second connecting plate 12, and the edge of the boss 8 located between the first connecting plate 6 and the second connecting plate 12 is provided with a first rounded corner 13.

[0034] Specifically, the first connecting plate 6 is located on the outside of the equipment housing, and the second connecting plate 12 is located on the inside of the equipment housing. The distance between the first connecting plate 6 and the second connecting plate 12 matches the thickness of the equipment housing. The first connecting plate 6 and the second connecting plate 12 are bolted to both sides of the equipment housing through bolt holes. When the equipment is running (such as when the motor 1 rotates or the fan 2 blades rotate), it will generate continuous vibration. A rubber gasket is fitted between the first connecting plate 6 and the second connecting plate 12 to absorb the vibration, improve the stability of the mounting base 5, and thus improve the detection accuracy.

[0035] The boss 8 between the first connecting plate 6 and the second connecting plate 12 has a first rounded corner 13 on its edge, thereby increasing the fit between the rubber gasket and the boss 8, preventing the edge from cutting the rubber gasket, and extending its service life.

[0036] See Figure 5 and Figure 6 Optionally, a rubber pad 14 is embedded in the groove 9, and the rubber pad 14 has an assembly hole in the middle that matches the first nut 10, and the first nut 10 has a second rounded corner 15 on the edge perpendicular to the bottom surface of the groove 9.

[0037] Specifically, when the first nut 10 is tightened, the rubber pad 14 is radially compressed, generating a rebound expansion force to achieve radial elastic clamping, strengthen the positive pressure of the threaded pair, restrict the radial degree of freedom of the first nut 10, and at the same time, the vibration energy absorbed by the damping characteristics of the rubber (converted into heat energy) reduces the dynamic load transmitted to the threaded pair, thereby reducing the probability of the first nut 10 loosening and avoiding probe instability caused by loosening.

[0038] The first nut 10 has a second rounded corner 15 on its edge perpendicular to the bottom surface of the groove 9, which prevents the edge from cutting into and damaging the rubber pad 14. This protective effect is more significant in a vibration environment. In addition, the second rounded corner 15 increases the contact area between the first nut 10 and the rubber pad 14, so that the first nut 10 is well wrapped and restrained.

[0039] Example 4: See Figure 7 and Figure 8Based on the above embodiments, optionally, at least two limiting screw holes 16 are respectively provided in the radial direction of the first nut 10 and the second nut 11. The limiting screw holes 16 are internally threaded with limiting screws 17. One end of the limiting screw 17 is provided with a pointed part 18 and the other end is provided with a cross groove head 19.

[0040] Specifically, the external thread on the proximity switch is restricted by screwing in the limiting screw 17, preventing the proximity switch from shifting due to the loosening of the first nut 10 and the second nut 11 under vibration, thus ensuring the detection performance of the proximity switch. One axial end of the limiting screw 17 has a pointed portion 18, which facilitates engagement with the thread profile, upgrading the stopping force from surface friction to mechanical engagement. The cross-shaped head 19 facilitates screwing in and out of the limiting screw 17. To prevent the pointed portion 18 from damaging the proximity switch, a flexible protective sleeve can be fitted over the pointed portion 18, or a blunt head can be used.

[0041] It should be noted that in this application, the proximity switch is a general term for the first proximity switch 3 and the second proximity switch 4. Since the first proximity switch 3 and the second proximity switch 4 have the same structure, only the connection structure between the mounting base 5 and the first proximity switch 3 is shown in the attached drawings. The first nut 10 and the second nut 11 have the same structure, so only the connection structure between the limit screw 17 and the first nut 10 is shown in the attached drawings.

[0042] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A device for detecting the difference in operating speed of a dust collector fan, comprising a motor and a fan, characterized in that, Also includes: A first proximity switch is located at the tail end of the motor; A second proximity switch is located on the side of the fan casing; The motor tail shaft is fitted with a metal block along its circumference. The first proximity switch is directly opposite the metal block and its axis is parallel to the motor tail shaft. The second proximity switch is directly opposite the fan blades and its axis is parallel to the fan main shaft.

2. The detection device for the difference in operating speed of a dust collector fan according to claim 1, characterized in that, The first proximity switch and the second proximity switch are detachably mounted on the tail end of the motor and the side of the fan volute via mounting bases, respectively. The tail end of the motor and the side of the fan volute are respectively provided with mounting holes that fit into the mounting bases.

3. The detection device for the difference in operating speed of a dust collector fan according to claim 2, characterized in that, The mounting base includes: The first connecting plate has several bolt holes near its outer periphery, and a through hole matching the first proximity switch and the second proximity switch is provided at the center of the first connecting plate. The inner wall of the through hole is provided with an internal thread that engages with the external threads of the first proximity switch and the second proximity switch.

4. The detection device for the difference in operating speed of a dust collector fan according to claim 3, characterized in that, A boss is provided on one side of the first connecting plate, and a groove is provided in the boss. The probe ends of the first proximity switch and the second proximity switch are fixed in the groove by the first nut. The wiring terminals of the first proximity switch and the second proximity switch are fixed to the side of the first connecting plate away from the boss by the second nut.

5. The detection device for the difference in operating speed of a dust collector fan according to claim 4, characterized in that, The probe end faces of the first proximity switch and the second proximity switch are flush with the end face of the boss away from the first connecting plate.

6. The detection device for the difference in operating speed of a dust collector fan according to claim 4, characterized in that, The boss is provided with a second connecting plate along its outer periphery. The second connecting plate has bolt holes corresponding to the first connecting plate. A rubber gasket is fitted between the first connecting plate and the second connecting plate, and the edge of the boss located between the first connecting plate and the second connecting plate has a first rounded corner.

7. The detection device for the difference in operating speed of a dust collector fan according to claim 4, characterized in that, A rubber pad is embedded in the groove, and an assembly hole matching the first nut is opened in the middle of the rubber pad. The first nut has a second rounded corner on the edge perpendicular to the bottom surface of the groove.

8. The detection device for the difference in operating speed of a dust collector fan according to claim 4, characterized in that, The first nut and the second nut each have at least two limiting screw holes in their radial directions. The limiting screw holes are internally threaded with limiting screws. One end of the limiting screw has a pointed part, and the other end has a cross-shaped groove head.

Images