CN-117516375-B - Device for detecting axial deflection of bicycle sprocket and control method

CN117516375BCN 117516375 BCN117516375 BCN 117516375BCN-117516375-B

Abstract

The invention discloses a bicycle sprocket axial deflection detection device and a control method, wherein the detection device comprises a detection module and an expanding automatic telescopic locking clamp, wherein the detection module is arranged on a rack, the expanding automatic telescopic locking clamp is used for fixing a sprocket, the detection module comprises a laser displacement sensor and a guide rod piece which can reciprocate along a laser beam path and is used as a laser receiving end, the detection module is arranged at the moving end of a single-shaft driver, the single-shaft driver can drive the guide rod piece to elastically lean against an outer ring gear tooth, and the expanding automatic telescopic locking clamp can drive autorotation through a stepping motor. The invention aims to provide a device and a method for detecting axial deflection of a bicycle sprocket, which can convert the axial deflection of adjacent gear teeth into the axial deflection of a detection plane by utilizing the sliding of a guide rod piece, and further detect the axial deflection of the sprocket by detecting the axial deflection of the detection plane through a laser displacement sensor.

Inventors

HE HAIDONG
DU WEIDONG
SONG ZEYU
LIU XINYI
WANG CHUNJU
CHEN LIGUO
SUN LINING

Assignees

苏州大学

Dates

Publication Date: 20260508
Application Date: 20231110

Claims (7)

1. The bicycle chain wheel axial deflection detection device is characterized by comprising a detection module arranged on a frame (1) and an expanding automatic telescopic locking clamp used for fixing a chain wheel (3), wherein the detection module comprises a laser displacement sensor (2) and a guide rod piece which can reciprocate along a laser beam path and is used as a laser receiving end; The detection module is arranged at the moving end of the single-shaft driver (4), and the single-shaft driver (4) can drive the guide rod piece to elastically lean against the outer ring gear teeth (301); The expanding automatic telescopic locking clamp can be driven to rotate through a stepping motor (14), and comprises an expanding expansion mechanism, an automatic telescopic locking mechanism and a combined sealing cover (15) which is covered on the peripheries of the expanding expansion mechanism and the automatic telescopic locking mechanism; The expanding and expanding mechanism comprises a positioning sleeve (16) arranged at the end part of the combined sealing cover (15), an expanding driving rod (17) with one end being slidably embedded in the positioning sleeve (16), and a plurality of expanding press blocks (18) which are respectively slidably sleeved on the expanding driving rod (17) and are slidably embedded on the positioning sleeve (16), wherein a chute structure is arranged between the expanding driving rod (17) and the expanding press blocks (18); The periphery of the diameter-expanding driving rod (17) is sleeved with a first sleeve (19) which is in sliding connection with the inside of the combined sealing cover (15), a second spring (20) which is sleeved on the periphery of the diameter-expanding driving rod (17) is arranged between the first sleeve (19) and the diameter-expanding driving rod (17), and two ends of the second spring (20) are respectively abutted against the bottom side of an inner cavity of the first sleeve (19) and a nail-shaped column head on the diameter-expanding driving rod (17); The automatic telescopic locking mechanism comprises an electric cylinder (21) capable of pushing the first sleeve (19) to move, and further comprises a second sleeve (22) which is arranged in the combined sealing cover (15) and opposite to the first sleeve (19) and can move synchronously, a third spring (23) is arranged between the second sleeve (22) and the inner cavity side wall of the combined sealing cover (15), and the third spring (23) is sleeved on the periphery of a limit column (24) arranged on the inner cavity side wall of the combined sealing cover (15); when the electric cylinder (21) pushes the first sleeve (19) to move, the third spring (23) is compressed to provide power for resetting the second sleeve (22), a closed-loop chute (2201) is arranged on the second sleeve (22), and a driven rod (25) is arranged at the other end of the combined sealing cover (15); the driven rod (25) is L-shaped, one section of the driven rod (25) is rotationally connected with the combined sealing cover (15) and can move up and down along the axis on which the section is positioned, and the end part of the other section of the driven rod can slide along the closed-loop chute (2201); The closed loop chute (2201) comprises an AB section, a BC section, a CD section and a DA section; The AB section is divided into a first section, a second section and a third section, the second section is an ascending gentle slope, the depth of a groove where the first section is located is higher than that of a groove where the third section is located, the depth of a groove where the third section is located is equal to that of a groove where the BC section is located, the depth of a groove where the DA section is located between the depth of the BC section and that of the groove where the first section is located, a step surface is arranged at a joint, and a stop block (26) is formed by encircling the closed-loop chute (2201) on the second sleeve (22).
2. The device for detecting the axial deflection of the bicycle sprocket wheel according to claim 1, wherein the guide rod part comprises a fixed seat (5) connected with the moving end of the single-shaft driver (4) and a detection guide rod (6) connected with the fixed seat (5) in a sliding manner, a laser receiving plate (7) is arranged at one end of the detection guide rod (6) facing the laser beam, the laser receiving plate (7) is sleeved on the periphery of a limit rod (8) which is arranged on the fixed seat (5) and parallel to the detection guide rod (6) in a sliding manner, and a first spring (9) arranged between the laser receiving plate (7) and the fixed seat (5) is sleeved on the periphery of the limit rod (8); One end of the detection guide rod (6) which can be abutted against the outer ring gear teeth (301) is provided with a touch plate (10), and the length of the touch plate (10) is larger than the distance between two adjacent outer ring gear teeth (301) on the chain wheel (3).
3. The bicycle sprocket axial runout detecting device according to claim 2, wherein a reset button (11) in signal connection with the single-shaft driver (4) and the stepping motor (14) is arranged on the frame (1).
4. The device for detecting axial deflection of a bicycle sprocket wheel according to claim 3, wherein a section of the driven rod (25) rotatably connected with the combined sealing cover (15) passes through the combined sealing cover (15), and a fourth spring (27) is sleeved on the periphery of the driven rod, and two ends of the fourth spring (27) are respectively abutted against the periphery of the combined sealing cover (15) and a nail-shaped column head of the section on the driven rod (25).
5. The method for controlling a bicycle sprocket axial runout detecting apparatus according to claim 4, comprising the steps of: pressing the reset button (11), wherein the single-shaft driver (4) drives the detection module to move to an initial position, and the stepping motor (14) drives the expanding type automatic telescopic locking clamp to rotate to an initial position; The sprocket (3) is sleeved on the periphery of the positioning sleeve (16) manually, and the electric cylinder (21) drives the expanding automatic telescopic locking clamp to reset after the first corresponding control operation is carried out, so that the position of the sprocket (3) is positioned and fixed; The single-shaft driver (4) drives the detection module to move towards the direction of the chain wheel (3) until the laser displacement sensor (2) detects that the distance changes, and the single-shaft driver (4) stops pushing; Step four, the laser displacement sensor (2) sets the plane at the moment as a detection reference plane, the stepping motor (14) is started to drive the expanding automatic telescopic locking clamp and the chain wheel (3) to rotate, detection starts, the stepping motor (14) stops after rotating for a preset number of turns, and the laser displacement sensor (2) collects data and uploads the data for analysis; And fifthly, after the stepping motor (14) stops driving, the single-shaft driver (4) resets, the electric cylinder (21) drives the expanding type automatic telescopic locking clamp to reset after performing a second corresponding control operation, and the chain wheel (3) is released and taken down to finish one-time detection.
6. The apparatus and method for detecting axial runout of a sprocket wheel according to claim 5, wherein the specific step of resetting the expanded-diameter automatic telescopic locking jig driven by the electric cylinder (21) after performing the first corresponding control operation comprises: The electric cylinder (21) pushes the first sleeve (19) and the second sleeve (22) to synchronously move towards a direction away from the positioning sleeve (16), the bottom side of an inner cavity of the first sleeve (19) is propped against and compresses the second spring (20), the second sleeve (22) is propped against and compresses the third spring (23), one end of the driven rod (25) slides along the AB section, then the first sleeve (19) pulls the expanding driving rod (17) to move in the same direction through the third spring (23), the expanding pressing block (18) gradually butts against the inner wall of a square hole on the chain wheel (3), and the position of the chain wheel (3) is positioned and fixed; step B, the electric cylinder (21) stops pushing the first sleeve (19) and the second sleeve (22) to move and reset; And C, rebounding the third spring (23), reversely moving the first sleeve (19) and the second sleeve (22), and moving one end of the driven rod (25) along the BC section until the driven rod falls into the C point to finish self-locking.
7. The control method of the bicycle sprocket axial runout detecting apparatus according to claim 5, wherein the specific step of resetting after the electric cylinder (21) drives the expanding automatic telescopic locking jig to perform the second corresponding control operation comprises: Step D, the electric cylinder (21) pushes the first sleeve (19) and the second sleeve (22) to synchronously move towards a direction away from the positioning sleeve (16), the bottom side of the inner cavity of the first sleeve (19) is propped against and compresses the second spring (20), the second sleeve (22) is propped against and compresses the third spring (23), and one end of the driven rod (25) slides along the CD section and falls into the DA section; E, stopping pushing the first sleeve (19) and the second sleeve (22) by the electric cylinder (21) to move and resetting, and returning one end of the driven rod (25) to the point A along the DA section under the elastic supporting action of the second spring (20) and the third spring (23), wherein the diameter-expanding press block (18) is re-embedded into the positioning sleeve (16).

Description

Device for detecting axial deflection of bicycle sprocket and control method Technical Field The invention relates to the technical field of detection of axial deflection of a bicycle sprocket, in particular to a device for detecting axial deflection of a bicycle sprocket and a control method. Background At present, a common speed-changing bicycle in life changes the speed of the bicycle by changing the gear ratio of a chain wheel and a flywheel. Because the sprockets with different sizes on the toothed disc are positioned on two different planes, if the sprockets are excessively deflected axially, the chain can be dropped off when being switched between the two sprockets, and the reliability of a speed changing system is affected. Therefore, during the production of the sprocket, the axial runout of the sprocket needs to be detected. In the prior art, manual operation is required in the axial deflection detection process of the whole chain wheel, the chain wheel is pressed by manpower, and the chain wheel is fixed by interference fit between shaft holes. During detection, the handle is manually shaken to drive the chain wheel to rotate, so that different gear teeth can be contacted with the dial indicator. In the whole process, workers are required to rotate the handle and judge the axial deflection of the gear teeth according to the readings of the dial indicator. The method has the following defects that firstly, eyes are easy to fatigue when reading for a long time, so that the standard of judging deflection by the same person at different time is different, secondly, the cost is high due to the fact that the visual inspection mode is too dependent on the working experience of an operator, thirdly, the visual inspection reading by the eyes is inevitably error, the standard is different, and fourthly, the clamping mode of the chain wheel is low in efficiency and easy to scratch the surface of a part. Therefore, how to provide a bicycle sprocket axial runout detecting device with strong universality, high efficiency and high measurement accuracy is a problem to be solved by those skilled in the art. Disclosure of Invention The invention aims to provide a device and a method for detecting axial deflection of a bicycle sprocket, which can convert the axial deflection of adjacent gear teeth into the axial deflection of a detection plane by utilizing the sliding of a guide rod piece, and further detect the axial deflection of the sprocket by detecting the axial deflection of the detection plane through a laser displacement sensor. The technical scheme includes that the bicycle sprocket axial deflection detection device comprises a detection module and an expanding automatic telescopic locking clamp, wherein the detection module is arranged on a frame and used for fixing a sprocket, and the detection module comprises a laser displacement sensor and a guide rod piece which can reciprocate along a laser beam path and is used as a laser receiving end; the detection module is arranged at the moving end of the single-shaft driver, and the single-shaft driver can drive the guide rod piece to elastically lean against the outer ring gear teeth; the expanding type automatic telescopic locking clamp can be driven to rotate through a stepping motor. In a preferred embodiment of the present invention, the guide rod part includes a fixed seat connected to the moving end of the single-axis driver, and a detection guide rod slidably connected to the fixed seat, wherein a laser receiving plate is disposed at one end of the detection guide rod facing the laser beam, the laser receiving plate is slidably sleeved on the periphery of a limit rod disposed on the fixed seat and parallel to the detection guide rod, and a first spring disposed between the laser receiving plate and the fixed seat is further sleeved on the periphery of the limit rod; And a touch plate is arranged at one end of the detection guide rod, which can be abutted against the outer ring gear teeth, and the length of the touch plate is larger than the distance between two adjacent outer ring gear teeth on the chain wheel. In a preferred embodiment of the present invention, a reset button is disposed on the frame and is in signal connection with the single-axis driver and the stepping motor. An expanding type automatic telescopic locking clamp comprises an expanding and expanding mechanism, an automatic telescopic locking mechanism and a combined sealing cover which is covered on the peripheries of the expanding and expanding mechanism and the automatic telescopic locking mechanism; The expanding and expanding mechanism comprises a positioning sleeve arranged at the end part of the combined sealing cover, an expanding driving rod with one end being slidably embedded in the positioning sleeve, and a plurality of expanding press blocks which are respectively slidably sleeved on the expanding driving rod and are slidably embedded on the positioning sleeve, wherein a