A method for detecting axial deviation of a fan main shaft

Abstract

The application discloses a kind of fan main shaft axial deviation detection methods, when fan main shaft occurs axial deviation in rotation process, detection shaft sleeve rotates along with fan main shaft and occurs axial deviation in rotation process, the detection shaft sleeve that occurs axial deviation exerts force on detection bearing, detection bearing is stressed and makes the end of connecting rod with hinged axle as fulcrum relative bracket along the direction of axial deviation of fan main shaft a certain displacement, and makes the other end of connecting rod with hinged axle as fulcrum relative bracket along the direction opposite to the direction of axial deviation of fan main shaft a certain displacement, linear displacement sensor detects the displacement generated by the other end of connecting rod, to detect the axial deviation distance of fan main shaft.The application can carry out dynamic real-time detection to the axial movement of fan main shaft, i.e.the axial deviation condition, and then can make timely judgment to the use condition of fan main shaft, bearing matched with fan main shaft and fan whole.

Description

Technical Field

[0001] This invention belongs to the technical field of detection methods, specifically relating to a method for detecting axial offset of a fan main shaft. Background Technology

[0002] In the tobacco industry, cigarette production workshops require constant temperature and humidity during production to meet the needs of the production process. Currently, combined air conditioning units are mainly used to ensure the different temperature and humidity requirements of each production workshop. These combined air conditioning units are equipped with centrifugal fans. While this type of fan has a simple structure and is easy to maintain, the operating environment in tobacco factories is relatively harsh. Soot and acidic / alkaline substances accumulate on the surface of the fan impeller and main shaft. Over time, this accumulation corrodes the fan impeller and main shaft, disrupting the dynamic and static balance, severely affecting the rotation of the fan impeller, increasing the load on the bearings, and causing the main shaft to shift or deviate. After long-term operation, the safety hazards of combined air conditioning units increase. At best, this causes increased fan vibration, leading to a significant reduction in bearing life and increased maintenance pressure. At worst, it can cause sparks from friction between the fan impeller and the fan casing, seizing of the fan casing and impeller, slippage and friction of the belt wound on the main shaft producing odors, significantly increased bearing stress leading to damage, and wear and tear on the main shaft, among other problems.

[0003] Since it is impossible to enter the air conditioning unit for inspection during the operation of the fan, the current practice is to conduct a visual inspection of the fan surface during the weekly shutdown. In addition, according to the maintenance manual, the bearing housing of the fan in each combined air conditioning unit is to be cleaned, lubricated, tightened or replaced every six months, with preventive maintenance as the main focus.

[0004] The problems with the above-mentioned treatment methods are as follows: (1) Due to the characteristics of the fan bearing housing and the unique fixing method of the fan main shaft, the bearing housing shell needs to be completely removed in order to check the actual condition of the bearing, bushing and other components. In daily shutdown inspections, the actual axial movement of the fan main shaft cannot be checked from the appearance alone; (2) Since the failure caused by the axial movement of the fan main shaft is often sudden, it is necessary to take the method of regularly checking and replacing the bearings. However, in the process of replacing the fan bearings in daily life, it was found that 90% of the fan bearings had no wear marks on the appearance, no noise when rotating, and were completely sealed and could still be used. This shows that the fixed-cycle preventive maintenance has the problem of over-maintenance, which leads to increased maintenance costs and waste of maintenance resources. Summary of the Invention

[0005] In view of the above-mentioned deficiencies of the prior art, the present invention provides a method for detecting axial offset of a fan main shaft, which can dynamically detect the axial movement, i.e., axial offset, of the fan main shaft in real time, and thus make timely judgments on the usage of the fan main shaft, the bearings matched with the fan main shaft, and the fan as a whole.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] A method for detecting axial offset of a fan main shaft is disclosed, which employs a fan main shaft axial offset detection device. The fan main shaft axial offset detection device includes a bracket fixed to a fan base frame. A connecting rod is provided above the bracket, and the bracket and the connecting rod are hinged in the middle. A detection bearing is rotatably connected to one end of the connecting rod. The detection bearing is engaged in a groove around the outer circumference of a detection sleeve fixed at one end of the fan main shaft. The other end of the connecting rod is connected to the bracket via a spring. A linear displacement sensor is also fixed on the bracket, located on the same side of the connecting rod as the fan main shaft. The measuring rod end of the linear displacement sensor is engaged on the outer surface of the corresponding side of the connecting rod near the spring.

[0008] The detection method is as follows: When the fan main shaft undergoes axial displacement during rotation, the detection sleeve rotates with the fan main shaft and undergoes axial displacement during rotation. The axially displaced detection sleeve applies a force to the detection bearing. The detection bearing is subjected to force, causing one end of the connecting rod to displace relative to the bracket with the hinge shaft as the fulcrum in the direction of axial displacement of the fan main shaft. The other end of the connecting rod is also displaced relative to the bracket with the hinge shaft as the fulcrum in the opposite direction to the axial displacement of the fan main shaft. The linear displacement sensor detects the displacement generated by the other end of the connecting rod to detect the axial displacement distance of the fan main shaft.

[0009] Furthermore, the linear displacement sensor also includes an elastic sensitive element, a resistance strain gauge, a compensation resistor, and a housing. The linear displacement sensor detects the displacement generated at the other end of the connecting rod to detect the axial offset distance of the fan main shaft. Specifically, when the measuring rod moves with the connecting rod, the elastic sensitive element deforms upon sensing the displacement of the measuring rod, causing the resistance strain gauge attached to the elastic sensitive element to deform as well. The resistance value of the deformed resistance strain gauge changes accordingly, and the change in resistance of the resistance strain gauge is linearly related to the displacement of the measuring rod. The measurement circuit of the linear displacement sensor converts the resistance change value into a voltage change value or a current change value, thereby converting the axial offset distance of the fan main shaft into a standard electrical signal to realize the detection of the axial offset distance of the fan main shaft.

[0010] Furthermore, the linear displacement sensor converts the signal into a standard electrical signal and transmits it to a display. The display shows the axial offset distance of the fan main shaft in real time, as well as the position of the fan main shaft in real time, and is used to analyze the axial offset trend of the fan main shaft.

[0011] Furthermore, the display transmits the stored real-time axial offset distance data of the fan spindle to the industrial control host computer of the combined air conditioning unit, and realizes the operation detection, monitoring and alarm of the fan spindle through the industrial control host computer.

[0012] Furthermore, the connecting rod is horizontal and perpendicular to the main shaft of the fan when there is no axial displacement of the fan shaft, and the measuring rod of the linear displacement sensor is parallel to the main shaft of the fan.

[0013] Furthermore, the detection bearing is connected to one end of the connecting rod via a bearing bracket. The bearing bracket includes a horizontal bracket base plate fixed to one side of the top surface of the connecting rod. Two vertical and parallel bracket side plates are integrally provided at one end of the top surface of the bracket base plate. A horizontal fixed shaft is fixed between the tops of the two bracket side plates. The fixed shaft is parallel to the main shaft of the fan when the main shaft of the fan does not shift axially. The inner ring of the detection bearing is sleeved and fixed on the fixed shaft, and the outer ring of the detection bearing is engaged in a groove around the outer circumference of the detection shaft sleeve.

[0014] Furthermore, the bracket base plate is provided with an elongated mounting hole, the extension direction of which is parallel to the extension direction of the connecting rod. The bracket base plate and the connecting rod are fixedly connected by fasteners that pass through the elongated mounting hole and the connecting rod in sequence. The mounting position of the bracket base plate on the connecting rod is adjusted through the elongated mounting hole to adjust the mounting distance between the detection bearing and the connecting rod, and to adjust the mounting distance between the detection bearing and the fan main shaft. There are multiple fasteners, each of which includes a fastening bolt and a fastening nut.

[0015] Furthermore, a mounting base is fixed on the top surface of the bracket. Multiple mounting sliders are provided on both sides of the outer shell on the top surface of the mounting base. Each mounting slider includes a slider body and a bolt screwed onto the slider body. Horizontal grooves are provided on the bottom of both sides of the outer shell. The slider body of each mounting slider on each side is slidably connected to the groove on the corresponding side. By adjusting the arrangement position of the slider body of each mounting slider on each side in the groove on the corresponding side, the arrangement position of the outer shell on the mounting base is adjusted. And by tightening the bolts of each mounting slider, the outer shell is fixed to the mounting base.

[0016] Furthermore, an inwardly concave arc-shaped surface is formed on the outer side of the corresponding side of the connecting rod near the spring. A blind hole is provided on the arc-shaped surface, and the measuring rod end of the linear displacement sensor is locked in the blind hole. The blind hole is located at the middle of the arc-shaped surface.

[0017] Furthermore, the bracket and the middle of the connecting rod are hinged by a vertical hinge shaft; a vertical first fixing rod is fixed at the other end of the connecting rod, the spring is horizontal and one end of the spring is fixed to the first fixing rod, and the other end is fixedly connected to a second fixing rod fixed to the bracket.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] In this invention, when the fan main shaft experiences axial movement (axial offset) during rotation, the detection sleeve rotates along with the fan main shaft and also experiences axial offset during rotation. The axially offset detection sleeve applies a force to the detection bearing, causing one end of the connecting rod to displace relative to the bracket along the direction of the fan main shaft's axial offset, with the hinge shaft as the fulcrum. The other end of the connecting rod, also with the hinge shaft as the fulcrum, displaces relative to the bracket in the opposite direction to the axial offset of the fan main shaft. A linear displacement sensor detects the displacement at the other end of the connecting rod to determine the axial offset distance of the fan main shaft. Therefore, this fan main shaft axial offset detection method can dynamically and in real-time detect the axial movement (axial offset) of the fan main shaft. Based on the axial offset, it can promptly assess the condition of the fan main shaft, its associated bearings, and the overall fan. If the axial offset is severe, timely repairs can be performed, preventing the fault from escalating and the fan from being damaged, thereby eliminating safety hazards, saving repair time and costs, and ensuring the safe operation of the combined air conditioning unit.

[0020] In this invention, the linear displacement sensor converts the signal into a standard electrical signal and transmits it to a display. This allows the display to show the axial offset distance of the fan shaft in real time, as well as its position, and to analyze the axial offset trend of the fan shaft.

[0021] In this invention, the display transmits the stored real-time axial offset distance data of the fan spindle to the industrial control host computer of the combined air conditioning unit. This allows the industrial control host computer to perform operational detection, monitoring, and alarm functions for the fan spindle.

[0022] In this invention, the detection bearing is connected to one end of the connecting rod via a bearing bracket. The bearing bracket includes a horizontal bracket base plate fixed to one side of the top surface of the connecting rod. Two vertical and parallel bracket side plates are integrally formed at one end of the top surface of the bracket base plate. A horizontal fixed shaft is fixed between the tops of the two bracket side plates. The fixed shaft is parallel to the main shaft of the fan when there is no axial displacement. The inner ring of the detection bearing is sleeved and fixed on the fixed shaft, and the outer ring of the detection bearing is engaged in a groove around the outer circumference of the detection shaft sleeve. The bracket base plate has an elongated mounting hole, the extension direction of which is parallel to the extension direction of the connecting rod. The bracket base plate and the connecting rod are fixedly connected by fasteners that pass through the elongated mounting hole and the connecting rod in sequence. In this way, the mounting position of the bracket base plate on the connecting rod can be adjusted by adjusting the mounting hole, thereby adjusting the mounting distance between the detection bearing and the connecting rod, and also adjusting the mounting distance between the detection bearing and the main shaft of the fan, so that this fan shaft axial displacement detection device can be adapted to different models of fan shafts.

[0023] In this invention, a mounting base is fixed to the top surface of the bracket. Multiple mounting sliders are provided on both sides of the outer casing on the top surface of the mounting base. Each mounting slider includes a slider body and a bolt screwed onto the slider body. Horizontal grooves are provided on the bottom of both sides of the outer casing. The slider bodies of each mounting slider on each side are slidably connected to the corresponding groove. By adjusting the arrangement of the slider bodies of each mounting slider on each side within the corresponding groove, the arrangement position of the outer casing on the mounting base is adjusted. Finally, by tightening the bolts of each mounting slider, the outer casing is fixed to the mounting base. This arrangement of multiple mounting sliders facilitates the replacement of linear displacement sensors with different ranges according to measurement requirements, making this fan main shaft axial offset detection device versatile. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the wind turbine main shaft axial offset detection device of the present invention, after concealing the detection bushing, linear displacement sensor and mounting base.

[0025] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure from another direction;

[0026] Figure 3 This is a top view of the wind turbine main shaft axial offset detection device of the present invention, after concealing the linear displacement sensor and the mounting base.

[0027] Figure 4 This is a schematic diagram showing the connection between a linear displacement sensor, a display, and an industrial control host computer.

[0028] Explanation of reference numerals in the figure: 101, bracket; 102, connecting rod; 1021, arc-shaped surface; 103, inspection bearing; 104, spring; 105, bearing bracket; 1051, bracket base plate; 10511, mounting elongated hole; 1052, bracket side plate; 106, fixed shaft; 107, fastening bolt; 108, fastening nut; 109, hinge shaft; 1010, first fixed rod; 1011, second fixed rod; 201, fan main shaft; 202, inspection bushing; 2021, groove. Detailed Implementation

[0029] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0030] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0033] like Figures 1-3As shown, a method for detecting axial offset of a wind turbine main shaft is employed using a wind turbine main shaft axial offset detection device. The device includes a bracket 101 fixed to a wind turbine base frame. A connecting rod 102 is positioned above the bracket 101, and the bracket 101 and the connecting rod 102 are hinged at their midpoints via a vertical hinge shaft 109. A detection bearing 103 is rotatably connected to one end of the connecting rod 102. The detection bearing 103 is engaged with a detection sleeve 2 fixed at one end of the wind turbine main shaft 201. Within the groove 2021 around the outer circumference of 02, the other end of the connecting rod 102 is connected to the bracket 101 via a spring 104. A linear displacement sensor, located on the same side of the fan main shaft 201 as the connecting rod 102, is also fixed on the bracket 101. The measuring rod end of the linear displacement sensor is engaged on the outer surface of the corresponding side of the connecting rod 102 near the spring 104. This fan main shaft axial offset detection device is used to convert the axial offset of the fan main shaft 201 during rotation into a detectable linear displacement.

[0034] The detection method is as follows: When the fan main shaft 201 rotates axially, the detection sleeve 202 rotates with the fan main shaft 201 and undergoes axial displacement during rotation. The axially displaced detection sleeve 202 applies a force to the detection bearing 103. The detection bearing 103 is subjected to force, causing one end of the connecting rod 102 to move relative to the bracket 101 with the hinge shaft 109 as the fulcrum in the direction of axial displacement of the fan main shaft 201. The other end of the connecting rod 102 is also moved relative to the bracket 101 with the hinge shaft 109 as the fulcrum in the opposite direction to the axial displacement of the fan main shaft 201. The linear displacement sensor detects the displacement generated by the other end of the connecting rod 102 to detect the axial displacement distance of the fan main shaft 201.

[0035] Therefore, this fan main shaft axial offset detection method can dynamically detect the axial movement, i.e., axial offset, of the fan main shaft 201 in real time. Based on the axial offset of the fan main shaft 201, the usage status of the fan main shaft 201, the bearings matched with the fan main shaft 201, and the fan as a whole can be judged in a timely manner. If the axial offset of the fan main shaft 201 is serious, it can be repaired in time to prevent the fault from expanding and the fan from being damaged, thereby eliminating safety hazards, saving maintenance time and maintenance costs, and ensuring the safe use of the combined air conditioning unit.

[0036] The detection sleeve 202 rotates with the fan main shaft 201 during operation and also vibrates to a certain extent with the fan main shaft 201. The detection bearing 103, which is a transmission component, is required to be more wear-resistant than the detection sleeve 202. The assembly gap between the detection bearing 103 and the detection sleeve 202 is controlled at 0.4-0.5mm. This can prevent the detection sleeve 202 from immediately rubbing against the detection bearing 103 during operation. At the same time, when the detection sleeve 202 is axially offset with the fan main shaft 201, it will not affect the transmission effect.

[0037] The linear displacement sensor includes an elastic sensitive element, a resistance strain gauge, a compensation resistor, and a housing. The linear displacement sensor detects the displacement at the other end of the connecting rod 102 to detect the axial offset distance of the fan main shaft 201. Specifically, when the measuring rod moves with the connecting rod 102, the elastic sensitive element deforms upon sensing the displacement, causing the resistance strain gauge attached to the elastic sensitive element to deform as well. The resistance value of the deformed resistance strain gauge changes accordingly, and the change in resistance is linearly related to the displacement of the measuring rod. The linear displacement sensor's measurement circuit converts the resistance change into a voltage change or a current change, thus converting the axial offset distance of the fan main shaft 201 into a standard electrical signal, thereby detecting the axial offset distance of the fan main shaft 201. Preferably, the linear displacement sensor has a range of 30mm, a detection accuracy of 0.1mm, and a detection range of -15mm ≤ ΔS ≤ 15mm. The center value of the linear displacement sensor is taken as zero, allowing for the detection of the left and right offset of the fan main shaft 201.

[0038] In one embodiment, such as Figure 4 As shown, the linear displacement sensor converts the signal into a standard electrical signal and transmits it to the display. The display shows the axial offset distance of the fan main shaft 201 in real time, as well as the position of the fan main shaft 201, and is used to analyze the axial offset trend of the fan main shaft 201. The display is an intelligent display instrument, powered by DC 24V, with a display accuracy of 0.1mm.

[0039] In one embodiment, such as Figure 4 As shown, the display transmits the real-time axial offset distance data of the fan spindle 201 stored in the display to the industrial control host computer of the combined air conditioning unit. Using the existing network platform, the operation detection and monitoring alarm of the fan spindle 201 are realized through the industrial control host computer.

[0040] In one embodiment, the connecting rod 102 is horizontal and perpendicular to the main shaft 201 of the fan when there is no axial displacement of the fan shaft 201, and the measuring rod of the linear displacement sensor is parallel to the main shaft 201 of the fan.

[0041] In one embodiment, the detection bearing 103 is connected to one end of the connecting rod 102 via a bearing bracket 105. The bearing bracket 105 includes a bracket base plate 1051 that is horizontal and fixed to one side of the top surface of the connecting rod 102. Two vertical and parallel bracket side plates 1052 are integrally provided at one end of the top surface of the bracket base plate 1051. A horizontal fixed shaft 106 is fixed between the tops of the two bracket side plates 1052. The fixed shaft 106 is parallel to the main shaft 201 of the fan when the fan main shaft 201 does not axially deviate. The inner ring of the detection bearing 103 is sleeved and fixed on the fixed shaft 106, and the outer ring of the detection bearing 103 is engaged in a groove 2021 around the outer circumference of the detection bushing 202.

[0042] Since the detection bearing 103 is rotatably connected to the bearing bracket 105, and the bearing bracket 105 is fixedly connected to the connecting rod 102, the detection bearing 103 can rotate relative to the connecting rod 102. Thus, when the detection bearing 103 is subjected to the force applied by the detection bushing 202, it can rotate relative to the connecting rod 102, thereby reducing the wear of the detection bearing 103.

[0043] Preferably, the bracket base plate 1051 is provided with an elongated mounting hole 10511, the extension direction of the elongated mounting hole 10511 is parallel to the extension direction of the connecting rod 102, and the bracket base plate 1051 and the connecting rod 102 are fixedly connected by fasteners that pass through the elongated mounting hole 10511 and the connecting rod 102 in sequence.

[0044] In this invention, considering that there are various models and specifications of the fan main shaft 201 in the combined air conditioning unit, detection bushings 202 of different sizes are designed to adapt to different models of fan main shafts 201. The mounting position of the bracket base plate 1051 on the connecting rod 102 is adjusted by adjusting the mounting elongated hole 10511, so as to adjust the mounting distance between the detection bearing 103 and the connecting rod 102, and the mounting distance between the detection bearing 103 and the fan main shaft 201, so that the fan main shaft axial offset detection device can adapt to different models of fan main shafts 201.

[0045] Preferably, there are two fasteners, each of which includes a fastening bolt 107 and a fastening nut 108.

[0046] In one embodiment, a mounting base is fixed on the top surface of the bracket 101. Multiple mounting sliders are provided on both sides of the housing on the top surface of the mounting base. Each mounting slider includes a slider body and a bolt screwed onto the slider body. Horizontal grooves are provided on the bottom of both sides of the housing. The slider body of each mounting slider on each side is slidably connected to the groove on the corresponding side. By adjusting the arrangement position of the slider body of each mounting slider on each side in the groove on the corresponding side, the arrangement position of the housing on the mounting base is adjusted. The housing is fixed to the mounting base by tightening the bolts of each mounting slider.

[0047] This arrangement of multiple mounting sliders allows for easy replacement of linear displacement sensors with different ranges according to measurement requirements, making the fan main shaft axial offset detection device versatile.

[0048] In one embodiment, an inwardly recessed arc-shaped surface 1021 is formed on the outer side of the corresponding side of the connecting rod 102 near the spring 104. A locking blind hole is provided on the arc-shaped surface 1021, and the measuring rod end of the linear displacement sensor is locked within the locking blind hole. Preferably, the locking blind hole is located at the middle of the arc-shaped surface 1021.

[0049] The use of the arc-shaped surface 1021 and the blind hole facilitates the secure connection of the measuring rod end of the linear displacement sensor to the connecting rod 102.

[0050] In one embodiment, a vertical first fixed rod 1010 is fixed to the other end of the connecting rod 102, and a horizontal spring 104 is fixed at one end to the first fixed rod 1010 and at the other end to a second fixed rod 1011 fixed to the bracket 101. Because the connecting rod 102 is relatively long, it may be subject to vibration from the fan main shaft 201 during rotation, resulting in a large oscillation amplitude at the other end of the connecting rod 102. The spring 104 stabilizes the oscillation at the other end of the connecting rod 102, making the displacement data detected by the linear displacement sensor more stable and with less fluctuation.

[0051] In one embodiment, a fastening screw is installed on the detection sleeve 202, and the fastening screw is disposed in the keyway of the fan main shaft 201. This ensures that the detection sleeve 202 cannot move axially on the fan main shaft 201.

[0052] In this invention, a belt is installed on one side of the fan main shaft 201 for transmission, while the fan main shaft axial offset detection device is installed on the other side of the fan main shaft 201.

[0053] This invention firstly enables dynamic detection of the axial movement of the fan main shaft 201, thus digitizing the operating status of the fan in the combined air conditioning unit. Secondly, it enables precise maintenance, improving maintenance efficiency and reducing maintenance costs.

[0054] According to the method of the present invention, the axial movement of the fan main shaft 201 was detected to be around ±0.2mm during actual operation of the combined air conditioning unit. The detection was stable, and the axial offset distance of the fan main shaft 201 could be detected online, and timely countermeasures could be taken.

[0055] The method of this invention pertains to a contact-based detection method for the axial displacement of the fan main shaft 201 in rotational motion. It is particularly suitable for specific environments such as high humidity, dust, and high air velocity, and the measurement accuracy of this method is unaffected by these environmental factors. Currently, for detecting the positional offset of rotating components, indirect measurement methods, i.e., non-contact measurement methods, are conventionally used. However, applying non-contact measurement methods to the high humidity, dust, and high air velocity environment inside a combined air conditioning unit can interfere with the measurement accuracy of the non-contact method.

[0056] In the actual use of one factory, there are 184 fan main shaft bearings in the existing combined air conditioning units. At an average cost of 800 yuan per bearing, the cost of replacing the fan main shaft bearings annually during preventive maintenance was 147,200 yuan. Now, with precise maintenance based on actual usage, and the fan main shaft bearings calculated based on a theoretical lifespan of 25,000 hours, or about 3 years, the annual maintenance cost is expected to decrease by 67%.

[0057] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A method for detecting axial offset of a fan main shaft, comprising using a fan main shaft axial offset detection device, characterized in that: The fan main shaft axial offset detection device includes a bracket (101) fixed on the fan base frame. A connecting rod (102) is provided above the bracket (101), and the bracket (101) and the connecting rod (102) are hinged in the middle. A detection bearing (103) is rotatably connected to one end of the connecting rod (102). The detection bearing (103) is locked in a groove (2021) around the outer circumference of the detection bushing (202) fixed at one end of the fan main shaft (201). The other end of the connecting rod (102) is connected to the bracket (101) through a spring (104). A linear displacement sensor is also fixed on the bracket (101) on the same side of the fan main shaft (201) and the connecting rod (102). The measuring rod end of the linear displacement sensor is locked on the outer side of the corresponding side of the connecting rod (102) near the spring (104). The detection method is as follows: When the fan main shaft (201) undergoes axial displacement during rotation, the detection sleeve (202) rotates along with the fan main shaft (201) and undergoes axial displacement during rotation. The axially displaced detection sleeve (202) applies a force to the detection bearing (103). The detection bearing (103) is subjected to force, causing one end of the connecting rod (102) to generate a certain displacement relative to the bracket (101) with the hinge shaft (109) as the fulcrum in the direction of axial displacement of the fan main shaft (201). The other end of the connecting rod (102) is also caused to generate a certain displacement relative to the bracket (101) with the hinge shaft (109) as the fulcrum in the direction opposite to the direction of axial displacement of the fan main shaft (201). The linear displacement sensor detects the displacement generated by the other end of the connecting rod (102) to detect the axial displacement distance of the fan main shaft (201).

2. The method for detecting axial offset of a wind turbine main shaft according to claim 1, characterized in that: The linear displacement sensor also includes an elastic sensitive element, a resistance strain gauge, a compensation resistor, and a housing. The linear displacement sensor detects the displacement generated at the other end of the connecting rod (102) to detect the axial offset distance of the fan main shaft (201). Specifically, when the measuring rod moves with the connecting rod (102), the elastic sensitive element deforms upon sensing the displacement of the measuring rod, causing the resistance strain gauge attached to the elastic sensitive element to deform as well. The resistance value of the deformed resistance strain gauge changes accordingly, and the resistance change value of the resistance strain gauge is linearly related to the displacement of the measuring rod. The resistance change value is converted into a voltage change value or a current change value through the measurement circuit of the linear displacement sensor, so as to convert the axial offset distance of the fan main shaft (201) into a standard electrical signal and realize the detection of the axial offset distance of the fan main shaft (201).

3. The method for detecting axial offset of a wind turbine main shaft according to claim 2, characterized in that: The linear displacement sensor converts the signal into a standard electrical signal and transmits it to the display. The display shows the axial offset distance of the fan main shaft (201) in real time, and also shows the position of the fan main shaft (201) in real time. The display is used to analyze the axial offset trend of the fan main shaft (201).

4. The method for detecting axial offset of a wind turbine main shaft according to claim 3, characterized in that: The display transmits the real-time axial offset distance data of the fan spindle (201) to the industrial control host computer of the combined air conditioning unit, and realizes the operation detection and monitoring alarm of the fan spindle (201) through the industrial control host computer.

5. The method for detecting axial offset of a wind turbine main shaft according to claim 2, characterized in that: The connecting rod (102) is horizontal and perpendicular to the main shaft (201) of the fan when there is no axial displacement of the fan main shaft (201), and the measuring rod of the linear displacement sensor is parallel to the main shaft (201) of the fan.

6. The method for detecting axial offset of a wind turbine main shaft according to claim 2, characterized in that: The detection bearing (103) is connected to one end of the connecting rod (102) via a bearing bracket (105). The bearing bracket (105) includes a bracket base plate (1051) that is horizontal and fixed to one side of the top surface of the connecting rod (102). Two vertical and parallel bracket side plates (1052) are integrally provided at one end of the top surface of the bracket base plate (1051). A horizontal fixed shaft (106) is fixed between the tops of the two bracket side plates (1052). The fixed shaft (106) is parallel to the fan main shaft (201) when the fan main shaft (201) does not shift axially. The inner ring of the detection bearing (103) is sleeved and fixed on the fixed shaft (106). The outer ring of the detection bearing (103) is engaged in a groove (2021) around the outer circumference of the detection bushing (202).

7. The method for detecting axial offset of a wind turbine main shaft according to claim 6, characterized in that: The bracket base plate (1051) is provided with an elongated mounting hole (10511), the extension direction of which is parallel to the extension direction of the connecting rod (102). The bracket base plate (1051) and the connecting rod (102) are fixedly connected by fasteners that pass through the elongated mounting hole (10511) and the connecting rod (102) in sequence. The mounting position of the bracket base plate (1051) on the connecting rod (102) is adjusted through the elongated mounting hole (10511) to adjust the installation distance between the detection bearing (103) and the connecting rod (102), and to adjust the installation distance between the detection bearing (103) and the fan main shaft (201). There are multiple fasteners, each of which includes a fastening bolt (107) and a fastening nut (108).

8. The method for detecting axial offset of a wind turbine main shaft according to claim 2, characterized in that: A mounting base is fixed on the top surface of the bracket (101). Multiple mounting sliders are provided on both sides of the outer shell on the top surface of the mounting base. Each mounting slider includes a slider body and a bolt screwed onto the slider body. Horizontal grooves are provided on the bottom of both sides of the outer shell. The slider body of each mounting slider on each side is slidably connected to the groove on the corresponding side. The arrangement position of the slider body of each mounting slider on each side in the groove on the corresponding side is adjusted to adjust the arrangement position of the outer shell on the mounting base. The outer shell is fixed to the mounting base by tightening the bolts of each mounting slider.

9. The method for detecting axial offset of a wind turbine main shaft according to claim 2, characterized in that: On the outer side of the corresponding side of the connecting rod (102), an inwardly concave arc-shaped surface (1021) is formed near the spring (104). A locking blind hole is provided on the arc-shaped surface (1021), and the end of the measuring rod of the linear displacement sensor is locked in the locking blind hole. The locking blind hole is located at the middle position of the arc-shaped surface (1021).

10. The method for detecting axial offset of a wind turbine main shaft according to claim 2, characterized in that: The bracket (101) and the connecting rod (102) are hinged at the middle by a vertical hinge shaft (109); a vertical first fixing rod (1010) is fixed at the other end of the connecting rod (102), the spring (104) is horizontal and one end of the spring (104) is fixed to the first fixing rod (1010), and the other end is fixedly connected to the second fixing rod (1011) fixed to the bracket (101).

Images