A mechanical blade adjustment device

Abstract

This utility model relates to a mechanical blade adjustment device, including a transmission component, a connecting plate, a thrust assembly, a moving bearing assembly, a fixed bearing assembly, a housing assembly, a stroke limiting ring, a push rod assembly, and a connecting flange. Power is input through a power input shaft, and the transmission component drives the push rod assembly to move along the push rod axial direction. A reversing transmission mechanism set in the inner ring of the impeller hub converts the axial thrust into rotational power, driving the blades to rotate and achieving blade angle adjustment. The blade adjustment device adopts mechanical transmission and has the characteristics of simple structure, low maintenance cost, fast response speed, strong environmental adaptability, and high energy efficiency; it is also convenient to use and install.

Description

Technical Field

[0001] This utility model relates to the field of mining ventilation fan technology, and in particular to a mechanical blade adjustment device. Background Technology

[0002] Mining ventilation fans are industrial equipment used for ventilation in mines. During mining operations, the ventilation volume in the mine is adjusted according to changes in underground climate, concentration of harmful gases, working face extension, and personnel and equipment. Therefore, the main ventilation fan is required to have a certain function of regulating air volume and air pressure to ensure a safe and comfortable underground working environment while meeting energy-saving requirements.

[0003] Currently, the surface axial flow main exhaust fans used in Chinese mines are mainly divided into two types: one is the "adjustable blades + constant speed" type, and the other is the "blade adjustment once during shutdown + frequency conversion speed regulation" type. Both types of exhaust fans can meet users' needs for adjusting air volume and air pressure.

[0004] For adjustable blade exhaust fans, traditional blade adjustment methods mostly employ hydraulic adjustment, using hydraulic cylinders as the thrust adjustment mechanism. However, hydraulic systems require cylinders, pumps, valves, pipelines, and seals, resulting in a complex system composition, poor structural compactness, and susceptibility to leakage due to seal failure. This not only leads to high maintenance costs but also causes performance fluctuations due to oil contamination, oil temperature changes, or seal aging, requiring frequent shutdowns for maintenance and severely impacting downhole operations.

[0005] Therefore, there is an urgent need to develop a mechanical blade adjustment device to solve the problems existing when using a hydraulic system as the blade adjustment system. Summary of the Invention

[0006] This utility model provides a mechanical blade adjustment device that uses mechanical transmission and features simple structure, low maintenance cost, fast response speed, strong environmental adaptability, and high energy efficiency; it is also convenient to use and install.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A mechanical blade adjusting device includes a transmission component, a connecting plate, a thrust assembly, a movable bearing assembly, a fixed bearing assembly, a housing assembly, a stroke limiting ring, a push rod assembly, and a connecting flange. The push rod assembly includes a push rod and a split flange. The push rod is coaxially arranged with the power output shaft of the transmission component. A housing assembly is provided between the transmission component and the split flange, and the housing assembly consists of a housing cover, a first housing, and a second housing connected in sequence. The connecting plate is connected to the transmission component. The first housing is connected to the connecting plate through the housing cover. A movable bearing assembly is provided between the push rod near the transmission component and the first housing, and a fixed bearing assembly is provided between the push rod near the split flange and the second housing. A bushing is provided between the fixed bearing assembly and the push rod, and the bushing is connected to the connecting flange provided on the push rod. A stroke limiting ring is provided on the outer side of the connecting flange. A thrust assembly is provided between the transmission component and the push rod, and the transmission component drives the movable bearing assembly and the push rod assembly to move axially along the push rod through the thrust assembly.

[0009] The transmission component consists of a worm gear transmission mechanism, a power input shaft, a lead screw, a power output shaft, and a thrust plate. The worm has power input shafts at both ends, the lead screw is coaxial with the worm gear, and the lead screw is connected to the power output shaft. The power output shaft is connected to the movable bearing assembly through the thrust plate.

[0010] The thrust assembly consists of a thrust ring, a thrust cover, and a thrust housing; the thrust housing is located between the movable bearing assembly and the housing, the thrust cover is located between the thrust disk and the movable bearing assembly, one side of the thrust housing and the thrust cover are connected, the other side of the thrust cover is connected to the thrust ring, and the thrust disk is located in the space formed by the thrust cover and the thrust ring.

[0011] The movable bearing assembly consists of an angular contact bearing, an inner bearing cover, an outer bearing cover, and an intermediate ring. Two sets of angular contact bearings are arranged side by side on the push rod, separated by the intermediate ring. The inner bearing cover is located at the end of the push rod and is connected to the push rod. The outer bearing cover is located at the end of the movable bearing assembly away from the inner bearing cover and is connected to the thrust housing in the thrust assembly.

[0012] The fixed bearing assembly consists of two angular contact bearings, two inner bearing covers, two outer bearing covers, two intermediate rings, a bushing, and a sleeve. Two sets of two angular contact bearings are arranged side by side on the push rod, separated by two intermediate rings. Two outer bearing covers are respectively provided on the outer sides of the two angular contact bearings, and the outer bearing covers are connected to the outer shell. A bushing is provided between the two angular contact bearings and the push rod. One end of the bushing is connected to the connecting flange, and the other end of the bushing is connected to the inner bearing cover. Sleeves are provided between the two ends of the bushing and the push rod. Dynamic sealing rings are provided between the connecting flange and the push rod, and between the inner bearing cover and the push rod.

[0013] A mechanical blade adjustment device further includes a second stroke limiting ring; the second stroke limiting ring is located on the side of the fixed bearing assembly away from the connecting flange, and the second stroke limiting ring is connected to the inner cover of the bearing in the fixed bearing assembly.

[0014] A mechanical blade adjustment device further includes a self-aligning assembly; the self-aligning assembly consists of a support block, an adjusting screw, and a locking nut; the support block is detachably fixed to the outer ring of the impeller hub, the adjusting screw is arranged radially along the impeller hub, the head of the adjusting screw passes through the support block and rests on the connecting flange, and a locking nut is provided between the adjusting screw and the support block.

[0015] A mechanical blade adjustment device further includes an anti-torsion assembly; the anti-torsion assembly includes a fixed bracket, a support member, and a rubber buffer pad; the middle part of the fixed bracket is connected to the top of the connecting plate by a screw, and an anti-loosening washer is provided between the screw and the connecting plate; both ends of the fixed bracket are respectively connected to the fixed part of the fan by the support member, the fixed bracket and the support member are connected by bolts, an anti-loosening washer is provided between the bolt head and the fixed bracket, a liner and a rubber buffer pad are provided between the fixed bracket and the support member, and an anti-loosening washer is provided between the support member and the nut.

[0016] A mechanical blade adjustment device further includes a ranging assembly; the ranging assembly includes a ranging sensor, a slider, a ring magnet, a first bracket, a second bracket, an insulating sleeve, and an insulating bushing; the slider is connected to the thrust housing in the thrust assembly; the first bracket is connected to the first housing, and the second bracket is connected to the slider; the guide rod of the ranging sensor passes through the connecting plate and the second bracket in sequence and is then connected to the first bracket; an insulating sleeve is provided between the measuring head of the ranging sensor and the connecting plate, and the insulating sleeve is locked and fixed to the guide rod by a headless bolt; a ring magnet is provided on the side of the second bracket near the connecting plate; an insulating bushing is provided on the side of the first bracket near the second bracket.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1) Compared with the moving blade adjustment device using a hydraulic system, the mechanical moving blade adjustment device of this utility model does not require the setting of an oil station and supporting components to match the hydraulic cylinder, and the moving blade adjustment mechanism will not jam when it operates.

[0019] 2) The mechanical blade adjustment device of this utility model has a maximum thrust of up to 12 tons, which can adjust the blades without stopping at low speed, ensuring smooth adjustment without shaking; the blade adjustment angle can be precisely controlled through the ranging component.

[0020] 3) The mechanical blade adjustment device described in this utility model can be manually adjusted by handwheel or automatically adjusted by connecting an external drive device (such as an electric actuator). After adjustment, it has a locking function, which is safe and reliable.

[0021] 4) The mechanical blade adjustment device described in this utility model has the characteristics of simple structure, low maintenance cost, fast response speed, strong environmental adaptability and high energy efficiency; and it is convenient to use and install. Attached Figure Description

[0022] Figure 1 This is a front cross-sectional view of a mechanical blade adjustment device according to the present invention.

[0023] Figure 2 This is an external view of the mechanical blade adjustment device described in this utility model.

[0024] Figure 3 This is a three-dimensional structural diagram of the push rod assembly described in this utility model.

[0025] Figure 4 This is a top view of the self-aligning component described in this utility model.

[0026] Figure 5 This is a schematic diagram of the anti-torsion component described in this utility model.

[0027] Figure 6 This is a schematic diagram of the working state of the mechanical moving blade adjustment device described in this utility model.

[0028] In the diagram: 1-Transmission component; 101-Power input shaft; 102-Thrust disc; 2-Connecting plate; 3-Thrust assembly; 301-Thrust ring; 302-Thrust cover; 303-Thrust housing; 4-Moving bearing assembly; 401-Angular contact bearing one; 402-Bearing inner cover one; 403-Bearing outer cover one; 404-Intermediate ring one; 5-Fixed bearing assembly; 501-Angular contact bearing two; 502-Bearing inner cover two; 503-Bearing outer cover two; 504-Intermediate ring two; 505-Shaft sleeve; 506-Dynamic seal ring; 507-Sleeve; 6-Housing assembly; 601-Housing housing one; 602-Housing housing two; 603-Housing housing cover; 7-Stroke limiting ring one; 8-Stroke limiting ring two; 9-Thrust Rod assembly; 901-Split flange; 902-Push rod; 10-Connecting flange; 11-Anti-torsion assembly; 1101-Fixed bracket; 1102-Rinse plate; 1103-Anti-loosening washer; 1104-Rubber buffer pad; 12-Distance measuring assembly; 1201-Distance sensor; 1202-Slider; 1203-Bracket one; 1204-Bracket two; 1205-Ring magnet; 1206-Insulating sleeve; 1207-Insulating bushing; 13-Self-aligning assembly; 1301-Support block; 1302-Adjusting screw; 1303-Locking nut; 1401-Blade drive shaft; 1402-Crank mechanism; 1403-Impeller hub; 1404-Impeller hub inner ring; 1405-Impeller hub outer ring. Detailed Implementation

[0029] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0030] like Figure 1 , Figure 2 As shown, the mechanical blade adjusting device of this utility model includes a transmission component 1, a connecting plate 2, a thrust assembly 3, a moving bearing assembly 4, a fixed bearing assembly 5, a housing assembly 6, a stroke limiting ring 7, a push rod assembly 9, and a connecting flange 10; Figure 3 As shown, the push rod assembly 9 includes a push rod 902 and a split flange 901; the push rod 902 is coaxially arranged with the power output shaft of the transmission component 1; a housing assembly 6 is provided between the transmission component 1 and the split flange 901, the housing assembly 6 is composed of a housing cover 603, a first housing 601 and a second housing 602 connected in sequence; a connecting plate 2 is connected to the transmission component 1; the first housing 601 is connected to the connecting plate 2 through the housing cover 603; a connection is provided between the push rod 902 near one end of the transmission component 1 and the first housing 601. The movable bearing assembly 4 has a fixed bearing assembly 5 between the push rod 902 near the split flange 901 and the outer casing 602; a bushing 505 is provided between the fixed bearing assembly 5 and the push rod 902, and the bushing 505 is connected to the connecting flange 10 provided on the push rod 902, and a stroke limiting ring 7 is provided on the outer side of the connecting flange 10; a thrust assembly 3 is provided between the transmission component 1 and the push rod 902, and the transmission component 1 drives the movable bearing assembly 4 and the push rod assembly 9 to move axially along the push rod 902 through the thrust assembly 3.

[0031] The transmission component 1 consists of a worm gear transmission mechanism, a power input shaft 101, a lead screw, a power output shaft, and a thrust plate 102. The worm is provided with power input shafts 101 at both ends, the lead screw is coaxial with the worm gear, and the lead screw is connected to the power output shaft for transmission. The power output shaft is connected to the movable bearing assembly 4 through the thrust plate 102.

[0032] The thrust assembly 3 consists of a thrust ring 301, a thrust cover 302, and a thrust housing 303. The thrust housing 303 is located between the movable bearing assembly 4 and the housing 601. The thrust cover 302 is located between the thrust disk 102 and the movable bearing assembly 4. One side of the thrust housing 303 and the thrust cover 302 are connected, and the other side of the thrust cover 302 is connected to the thrust ring 301. The thrust disk 102 is located in the space formed by the thrust cover 302 and the thrust ring 301.

[0033] The movable bearing assembly 4 consists of an angular contact bearing 401, an inner bearing cover 402, an outer bearing cover 403, and an intermediate ring 404. Two sets of angular contact bearings 401 are arranged side by side on the push rod 902, separated by the intermediate ring 404. The inner bearing cover 402 is provided at the end of the push rod 902 and is connected to the push rod 902. The outer bearing cover 403 is provided at one end of the movable bearing assembly 4 away from the inner bearing cover 402 and is connected to the thrust housing 303 in the thrust assembly 3.

[0034] The fixed bearing assembly 5 consists of an angular contact bearing 501, an inner bearing cover 502, an outer bearing cover 503, an intermediate ring 504, a bushing 505, and a sleeve 507. Two sets of angular contact bearings 501 are arranged side by side on the push rod 902, separated by the intermediate ring 504. The outer bearing cover 503 is provided on the outer side of each of the two angular contact bearings 501, and the outer bearing cover 503 is connected to the outer shell 602. A bushing 505 is provided between the angular contact bearing 501 and the push rod 902. One end of the bushing 505 is connected to the connecting flange 10, and the other end of the bushing 505 is connected to the inner bearing cover 502. A sleeve 507 is provided between both ends of the bushing 505 and the push rod 902. Dynamic sealing rings 506 are provided between the connecting flange 10 and the push rod 902, and between the inner bearing cover 502 and the push rod 902.

[0035] The mechanical blade adjustment device of this utility model further includes a stroke limiting ring 2 8; the stroke limiting ring 2 8 is located on the side of the fixed bearing assembly 5 away from the connecting flange 10, and the stroke limiting ring 2 8 is connected to the bearing inner cover 2 502 in the fixed bearing assembly 5.

[0036] The mechanical blade adjustment device of this utility model further includes a self-aligning assembly 13; as shown in the figure. Figure 4 As shown, the self-aligning assembly 13 consists of a support block 1301, an adjusting screw 1302, and a locking nut 1303. The support block 1301 is detachably fixed to the outer ring 1405 of the impeller hub. The adjusting screw 1302 is arranged radially along the impeller hub 1403. The head of the adjusting screw 1302 passes through the support block 1301 and rests on the connecting flange 10. A locking nut 1303 is provided between the adjusting screw 1302 and the support block 1301.

[0037] The mechanical blade adjustment device of this utility model further includes an anti-torsion component 11; as... Figure 5As shown, the anti-torsion assembly 11 includes a fixed bracket 1101, a support member (not shown in the figure), and a rubber buffer pad 1104; the middle part of the fixed bracket 1101 is connected to the top of the connecting plate 2 by a screw, and an anti-loosening washer 1103 is provided between the screw and the connecting plate 2; the two ends of the fixed bracket 1101 are respectively connected to the fixed part of the fan (such as the rectifier ring housing) through the support member, the fixed bracket 1101 and the support member are connected by bolts, and an anti-loosening washer 1103 is provided between the bolt head and the fixed bracket 1101; a liner 1102 and a rubber buffer pad 1104 are provided between the fixed bracket 1101 and the support member, and an anti-loosening washer 1103 is provided between the support member and the nut.

[0038] like Figure 1 As shown, the mechanical blade adjustment device of this utility model further includes a ranging component 12; the ranging component 12 includes a ranging sensor 1201, a slider 1202, a ring magnet 1205, a first bracket 1203, a second bracket 1204, an insulating sleeve 1206, and an insulating bushing 1207; the slider 1202 is connected to the thrust housing 303 in the thrust component 3; the first bracket 1203 is connected to the first housing 601, and the second bracket 1204 is connected to the slider 1202; the guide rod of the ranging sensor 1201 passes through the connecting plate 2 and the second bracket 1204 in sequence and is connected to the first bracket 1203; an insulating sleeve 1206 is provided between the measuring head of the ranging sensor 1201 and the connecting plate 2, and the insulating sleeve 1206 is locked and fixed to the guide rod by a headless bolt; the ring magnet 1205 is provided on the side of the second bracket 1204 near the connecting plate 2; the insulating bushing 1207 is provided on the side of the first bracket 1203 near the second bracket 1204.

[0039] like Figure 6 As shown, the method of using the mechanical blade adjustment device of this utility model is as follows:

[0040] 1) Install the blade adjustment device; including connecting the split flange 901 in the push rod assembly 9 to the inner ring 1404 of the impeller hub of the fan, and connecting the connecting flange 10 to the outer ring 1405 of the impeller hub of the fan.

[0041] 2) Install the self-aligning assembly 13, and fine-tune the blade adjustment device by adjusting screw 1302 to ensure that its concentricity with the impeller hub 1403 meets the requirements; after adjustment, install the anti-torsion assembly 11.

[0042] 3) Install the ranging component 12;

[0043] 4) Power is input through the power input shaft, and the transmission component 1 drives the push rod assembly 9 to move axially along the push rod 902; the axial thrust is converted into rotational power through the reversing transmission mechanism set in the inner ring 1404 of the impeller hub, which drives the blade to rotate and realizes the adjustment of the blade angle.

[0044] 5) When the blade angle is adjusted while the impeller hub 1403 is stationary, only the moving bearing assembly 4 and the push rod assembly 9 move axially; when the blade angle is adjusted while the impeller hub 1403 is rotating, the moving bearing assembly 4 and the push rod assembly 9 move axially, and the push rod assembly 9 and the bushing 505 rotate with the impeller hub 1403, which in turn drives the bearing inner cover 502, the sleeve 507 and the intermediate ring 504 in the fixed bearing assembly 5 to rotate synchronously.

[0045] 6) The inner bearing cover 502 or the stroke limiting ring 8 in the fixed bearing assembly 5 is used to limit the stroke of the push rod assembly 9 when it moves toward the impeller hub 1403; the stroke limiting ring 7 is used to limit the stroke of the push rod assembly 9 when it moves away from the impeller hub 1403.

[0046] 7) The axial movement distance of the push rod assembly 9 is fed back in real time by the ranging sensor 1201 in the ranging assembly 12 to control the angle of the adjusted blade to meet the requirements.

[0047] In the mechanical blade adjustment device of this utility model, the transmission component 1 is connected to the connecting plate 2. The connecting plate 2 is connected to the housing assembly 6 and forms a space to accommodate the mechanical transmission structure. The transmission component 1 generates axial thrust under the drive of a handwheel or electric actuator. The axial thrust acts on the thrust assembly 3 and pushes the push rod assembly 9 and the moving bearing assembly 4 to move axially. The forward (near the impeller hub direction, the same below) stroke is limited by the bearing inner cover 502 or the stroke limiting ring 8 in the fixed bearing assembly 5, and the backward (away from the impeller hub direction, the same below) stroke is limited by the stroke limiting ring 7. The axial displacement of the push rod assembly 9 can be accurately measured by the distance measuring assembly 12. The fixed bearing assembly 5 is fixedly connected to the housing assembly 6 for self-alignment and to reduce additional axial force. The connecting flange 10 is used to connect to the stator of the impeller hub 1403 to ensure the overall stability of the device during operation. The push rod assembly 9 bears the axial thrust and transmits it to the rotor of the impeller hub 1403. Then, through a crank mechanism 1402 or a rack and pinion mechanism, the axial thrust is converted into rotational force (existing technology), enabling blade angle adjustment to improve the overall efficiency of the fan. The anti-torsion assembly 11 reduces vibration during operation and prevents radial torsion. The self-aligning assembly 13 is used for fine-tuning after installation to ensure concentricity with the impeller hub 1403.

[0048] The working principle of the mechanical blade adjustment device of this utility model is as follows: the transmission component 1 generates axial power through external drive, which in turn drives the thrust component 3 to move. Under the action of the thrust component 3, the push rod component 9 moves axially, and the blade transmission shaft 1401 is rotated through the crank mechanism 1402 or the gear and rack mechanism, thereby realizing the blade angle adjustment.

[0049] The following embodiments are implemented based on the technical solution of this utility model, providing detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the following embodiments. Unless otherwise specified, the methods used in the following embodiments are conventional methods.

[0050]

Example 1

[0051] In this embodiment, the mechanical blade adjustment device includes a transmission component 1, a connecting plate 2, a thrust assembly 3, a moving bearing assembly 4, a fixed bearing assembly 5, a housing assembly 6, a stroke limiting ring 1 7, a stroke limiting ring 2 8, a push rod assembly 9, and a connecting flange 10, etc.

[0052] In this embodiment, the main body of the transmission component 1 adopts a worm gear mechanism. The worm has power input shafts at both ends for mounting the adjustment handwheel and the electric actuator, facilitating switching between manual and electric drive modes. In manual mode, the position of the adjustment handwheel is locked after the blade angle adjustment is completed, making it safer and more reliable than hydraulic drive. In electric mode, intelligent control can be achieved through interlocking the electric actuator with the control system.

[0053] In this embodiment, the worm gear mechanism is fixed to the connecting plate 2 by flange bolts, and the connecting plate 2 is provided with threaded holes for mating with the flange bolts. The connecting plate 2 is connected to the housing assembly 6 by cylindrical screws, and the housing assemblies 6 are fixedly connected by bolts and locating pins.

[0054] The kinetic energy transmitted by the transmission component 1 is applied to the thrust assembly 3. In this embodiment, the thrust assembly 3 consists of a thrust ring 301, a thrust cover 302, and a thrust housing 303. During forward movement (towards the impeller hub 1403), the axial force generated by the transmission component 1 acts directly on the thrust cover 302; during backward movement (away from the impeller hub 1403), the axial force generated by the transmission component 1 acts directly on the thrust ring 301. The thrust ring 301 and the thrust cover 302 are connected by bolts, and a small gap is left between the transmission component 1 and the thrust ring 301 and the thrust cover 302 to avoid friction. The thrust cover 302 is connected to the thrust housing 303 by bolts. The entire thrust assembly 3 is located within the space formed by the housing assembly 6, and a small gap is left between the thrust assembly 3 and the housing assembly 6.

[0055] In this embodiment, the movable bearing assembly 4 consists of two sets of angular contact bearings 401, an inner bearing cover 402, an outer bearing cover 403, an intermediate ring 404, and laminated plates. Both sets of angular contact bearings 401 are located inside the thrust housing 303. The movable bearing assembly 4 and the thrust assembly 3 can move axially with the transmission component 1. Laminated plates are provided between the outer bearing cover 403 and the thrust housing 303, and between the inner bearing cover 402 and the push rod 902.

[0056] In this embodiment, the fixed bearing assembly 5 consists of two sets of angular contact bearings 501, an inner bearing cover 502, an outer bearing cover 503, an intermediate ring 504, a laminated plate, a bushing 505, a Y-type mechanical seal (dynamic seal 506), and a sleeve 507. The outer bearing cover 503 is bolted to the outer shell 602, and the inner bearing cover 502 is connected to the bushing 505 with cylindrical screws. A small gap is left between the inner bearing cover 502 and the outer bearing cover 503. When the push rod 902 moves axially, the outer bearing covers 503 on both sides of the fixed bearing assembly 5 can prevent other components besides the push rod 902 from moving axially. The Y-type mechanical seal is used to prevent dust from entering and reduce friction. Laminated plates are provided between the outer bearing cover 503 and the outer shell 602, and between the inner bearing cover 502 and the bushing 505. The bushing 505 is connected to the connecting flange 10 by bolts. The connecting flange 10 is fixed to the outer ring 1405 of the impeller hub, and the split flange 901 is fixed to the inner ring 1404 of the impeller hub.

[0057] The mechanical blade adjustment device of this utility model can adjust the blade angle during the rotation of the impeller hub 1403, and can also adjust the blade angle when the impeller hub 1403 is stationary. In this embodiment, a gap is left between the movable bearing assembly 4 and the outer casing 601 to achieve low-speed, non-stop blade angle adjustment when the impeller hub 1403 is rotating. When adjusting the blade angle when the impeller hub 1403 is stationary, only the movable bearing assembly 4 and the push rod assembly 9 move axially. When adjusting the blade angle during the rotation of the impeller hub 1403, while the movable bearing assembly 4 and the push rod assembly 9 move axially, the rotation of the impeller hub 1403 will drive the push rod assembly 9 and the bushing 505 to rotate, and further drive the inner bearing cover 502, the Y-type mechanical seal ring, the sleeve 507, and the intermediate ring 504 to rotate.

[0058] When the blade angle adjustment range is small, a travel limiting ring 8 can be installed between the movable bearing assembly 4 and the fixed bearing assembly 5 to limit the forward axial travel of the push rod 902. The travel limiting ring 8 is fixed to the bearing inner cover 502 of the fixed bearing assembly 5 by bolts. Normally, the bearing inner cover 502 of the fixed bearing assembly 5 can be used directly as the travel limiting structure, in which case the travel limiting ring 8 is not required. In this embodiment, the fixed bearing assembly 5 uses an aluminum Y-type mechanical seal ring to achieve dynamic sealing, which prevents dust from entering, avoids grease leakage and contamination inside the angular contact bearing 501, and effectively reduces friction.

[0059] In this embodiment, the connecting flange 10 is provided with threaded holes for installing the stroke limiting ring 7, threaded holes for installing the bushing 505 in the fixed bearing assembly 5, and through holes for connecting with the impeller hub 1403. The stroke limiting ring 7 is fixed to the connecting flange 10 by hexagonal head bolts and is used to limit the axial travel of the push rod assembly 9 when it moves backward.

[0060] Precise control of blade adjustment can be achieved by setting the travel limit of push rod assembly 9.

[0061] In this embodiment, the push rod assembly 9 includes a split flange 901 and a push rod 902. The end of the push rod 902 is provided with an annular groove for positioning the split flange 901. The split flange 901 is bolted to the impeller hub inner ring 1404. When the push rod assembly 9 is subjected to axial force transmitted from the transmission component 1, the axial force is converted into rotational force through the crank mechanism 1402 or gear and rack mechanism provided in the impeller hub inner ring 1404, and the rotational force is transmitted to the blade through the blade drive shaft 1401 to complete the adjustment of the blade angle. The process of converting the axial force of the push rod 902 into the blade rotational force is prior art (see the "Guide Blade Adjustment Mechanism of a Fan" disclosed in Chinese Utility Model Patent No. CN201963602U), and will not be described in detail here.

[0062] In this embodiment, the outer casing assembly 6 consists of outer casing one 601, outer casing two 602, and outer casing cover 603. Outer casing one 601 and outer casing two 602 are fixed together by bolts and locating pins. The connecting plate 2 has countersunk screw holes, and the outer casing cover 603 is connected to the connecting plate 2 by cylindrical screws. The outer casing cover 603 has countersunk holes, and outer casing one 601 is connected to the outer casing cover 603 by cylindrical screws. The bearing outer cover two 503 of the fixed bearing assembly 5 has countersunk holes, and outer casing two 602 is connected to the bearing outer cover two 503 by cylindrical screws.

[0063]

Example 2

[0064] This embodiment is an improvement on embodiment 1. Mesh ventilation holes are opened on the outer shell 601 of the outer shell assembly 6. The mesh ventilation holes are composed of multiple triangular holes to increase the heat dissipation area, improve the heat dissipation effect, and ensure the stable operation of the internal mechanical structure of the device.

[0065]

Example 3

[0066] This embodiment adds a ranging component 12 to the existing embodiment 1.

[0067] The ranging assembly 12 consists of a slider 1202, a first bracket 1203, a second bracket 1204, an insulating bushing 1207, a ranging sensor 1201 (including a measuring head and guide rod), an insulating sleeve 1206, and a ring magnet 1205. The first bracket 1203 is bolted to the outer casing 601. The slider 1202 has grooves and threaded holes for fixing the second bracket 1204, which is bolted to the slider 1202. The ring magnet 1205 has four threaded holes and is bolted to the second bracket 1204. The insulating bushing 1207 has four threaded holes and is bolted to the first bracket 1203. The insulating sleeve 1206 is bolted to the bottom of the connecting plate 2.

[0068] The guide rod of the ranging sensor 1201 passes through the insulating sleeve 1206, the connecting plate 2, the ring magnet 1205, the second bracket 1204, and the insulating bushing 1207 in sequence, and then connects to the first bracket 1203. The position is locked by the headless bolts set on both sides of the insulating sleeve 1206 to prevent axial movement.

[0069] The second bracket 1204 is located in the middle of the device. When the transmission component 1 is working, the thrust component 3 drives the sliding bearing component 4 to move axially, and at the same time drives the slider 1202 and the second bracket 1204 to move along the guide rod of the distance sensor 1201. After the distance sensor 1201 captures the magnetic induction signal of the ring magnet 1205, it displays and records the specific data of the displacement.

[0070] The slider 1202 is connected to the thrust housing 303 of the thrust assembly 3 by a cylindrical screw. The slider 1202 is provided with an oil injection hole, which is sealed by a screw plug.

[0071]

Example 4

[0072] This embodiment adds a self-aligning component 13 and an anti-torsion component 11 to the existing embodiments 1 to 3.

[0073] The support block 1301 of the self-aligning assembly 13 is fixed to the outer ring 1405 of the impeller hub and has a certain gap from the connecting flange 10. After the mechanical moving blade adjustment device is installed and initially aligned, it is finely adjusted by adjusting screw 1302 so that the concentricity of the device and the impeller hub 1403 meets the requirements.

[0074] The anti-torsion component 11 is fixedly connected to the connecting plate 2. After the mechanical blade adjustment device completes the concentricity adjustment through the self-aligning component 13, the anti-torsion component 11 is connected to the rectifier ring shell of the fan by the support component (on-site welding) to prevent the device from vibrating and torsion during mechanical operation.

[0075] In this embodiment, the anti-torsion assembly 11 consists of a fixed bracket 1101, a liner 1102, an anti-loosening washer 1103, a rubber buffer pad 1104, and a support member. The fixed bracket 1101 is horizontally placed on top of the connecting plate 2 and is fixedly connected using cylindrical head screws and anti-loosening washers 1103 through through holes provided on the fixed bracket 1101 and bolt holes on the connecting plate 2. Through holes are provided at both ends of the fixed bracket 1101, and the rubber buffer pad 1104 and the support member are connected by hexagonal head bolts and hexagonal head nuts. The rubber buffer pad 1104 is used for buffering and shock absorption. The liner 1102 is located between the fixed bracket 1101 and the rubber buffer pad 1104, and an anti-loosening washer 1103 is provided between the hexagonal nut and the support member.

[0076] By setting the anti-torsion component 11, it can be ensured that the adjustment process of the moving blade is smooth and without vibration.

[0077] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A mechanical blade adjustment device, characterized in that The system includes a transmission component, a connecting plate, a thrust assembly, a movable bearing assembly, a fixed bearing assembly, a housing assembly, a stroke limiting ring I, a push rod assembly, and a connecting flange. The push rod assembly includes a push rod and a split flange. The push rod is coaxially arranged with the power output shaft of the transmission component. A housing assembly is provided between the transmission component and the split flange, and the housing assembly consists of a housing cover, a housing first, and a housing second connected in sequence. The connecting plate is connected to the transmission component. The housing first is connected to the connecting plate through the housing cover. A movable bearing assembly is provided between the push rod near the transmission component and the housing first, and a fixed bearing assembly is provided between the push rod near the split flange and the housing second. A bushing is provided between the fixed bearing assembly and the push rod, and the bushing is connected to the connecting flange provided on the push rod. A stroke limiting ring I is provided on the outer side of the connecting flange. A thrust assembly is provided between the transmission component and the push rod, and the transmission component drives the movable bearing assembly and the push rod assembly to move along the push rod axially through the thrust assembly.

2. A mechanical blade adjustment device according to claim 1, characterized in that The transmission component consists of a worm gear transmission mechanism, a power input shaft, a lead screw, a power output shaft, and a thrust plate. The worm has power input shafts at both ends, the lead screw is coaxial with the worm gear, and the lead screw is connected to the power output shaft. The power output shaft is connected to the movable bearing assembly through the thrust plate.

3. The mechanical blade adjusting device according to claim 1, characterized in that, The thrust assembly consists of a thrust ring, a thrust cover, and a thrust housing; the thrust housing is located between the movable bearing assembly and the housing, the thrust cover is located between the thrust disk and the movable bearing assembly, one side of the thrust housing and the thrust cover are connected, the other side of the thrust cover is connected to the thrust ring, and the thrust disk is located in the space formed by the thrust cover and the thrust ring.

4. The mechanical blade adjusting device according to claim 1, characterized in that, The movable bearing assembly consists of an angular contact bearing, an inner bearing cover, an outer bearing cover, and an intermediate ring. Two sets of angular contact bearings are arranged side by side on the push rod, separated by the intermediate ring. The inner bearing cover is located at the end of the push rod and is connected to the push rod. The outer bearing cover is located at the end of the movable bearing assembly away from the inner bearing cover and is connected to the thrust housing in the thrust assembly.

5. A mechanical blade adjusting device according to claim 1, characterized in that, The fixed bearing assembly consists of two angular contact bearings, two inner bearing covers, two outer bearing covers, two intermediate rings, a bushing, and a sleeve. Two sets of two angular contact bearings are arranged side by side on the push rod, separated by two intermediate rings. Two outer bearing covers are respectively provided on the outer sides of the two angular contact bearings, and the outer bearing covers are connected to the outer shell. A bushing is provided between the two angular contact bearings and the push rod. One end of the bushing is connected to the connecting flange, and the other end of the bushing is connected to the inner bearing cover. Sleeves are provided between the two ends of the bushing and the push rod. Dynamic sealing rings are provided between the connecting flange and the push rod, and between the inner bearing cover and the push rod.

6. A mechanical blade adjusting device according to claim 1, characterized in that, It also includes a second travel limiting ring; the second travel limiting ring is located on the side of the fixed bearing assembly away from the connecting flange, and the second travel limiting ring is connected to the inner cover of the bearing in the fixed bearing assembly.

7. A mechanical blade adjusting device according to claim 1, characterized in that, It also includes a self-aligning assembly; the self-aligning assembly consists of a support block, an adjusting screw, and a locking nut; the support block is detachably fixed to the outer ring of the impeller hub, the adjusting screw is arranged radially along the impeller hub, the head of the adjusting screw passes through the support block and rests on the connecting flange, and a locking nut is provided between the adjusting screw and the support block.

8. A mechanical blade adjusting device according to claim 1, characterized in that, It also includes an anti-torsion component; the anti-torsion component includes a fixed bracket, a support member, and a rubber buffer pad; the middle part of the fixed bracket is connected to the top of the connecting plate by screws, and an anti-loosening washer is provided between the screws and the connecting plate; the two ends of the fixed bracket are respectively connected to the fixed part of the fan by the support member, the fixed bracket and the support member are connected by bolts, an anti-loosening washer is provided between the bolt head and the fixed bracket, a liner and a rubber buffer pad are provided between the fixed bracket and the support member, and an anti-loosening washer is provided between the support member and the nut.

9. A mechanical blade adjusting device according to claim 1, characterized in that, It also includes a ranging assembly; the ranging assembly includes a ranging sensor, a slider, a ring magnet, a first bracket, a second bracket, an insulating sleeve, and an insulating bushing; the slider is connected to the thrust housing in the thrust assembly; the first bracket is connected to the first housing, and the second bracket is connected to the slider; the guide rod of the ranging sensor passes through the connecting plate and the second bracket in sequence and is then connected to the first bracket; an insulating sleeve is provided between the measuring head of the ranging sensor and the connecting plate, and the insulating sleeve is locked and fixed to the guide rod by a headless bolt; a ring magnet is provided on the side of the second bracket near the connecting plate; an insulating bushing is provided on the side of the first bracket near the second bracket.

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