A drive shaft quality inspection device and method thereof

Abstract

The present invention discloses a quality detection device and method for a drive shaft, belonging to the field of drive shaft detection. It includes a base. At a position near the center on the upper end surface of the base, two sets of conveying frames are symmetrically and fixedly connected left and right. At one end of the upper end surfaces of the two sets of conveying frames close to each other, support plates are fixedly connected. The two sets of conveying frames are fixedly connected by a bracket, and the lower end surface of the bracket is fixedly connected to the base through three legs evenly distributed at equal intervals; at a position between the two support plates on each set of conveying frames, a longitudinally movable clamping plate is suspended. On the left and right sides of the inner side of the clamping plate, two measuring plates are elastically connected by two support columns. On the side of the support columns away from each other, L-shaped sliding rods are fixedly connected. It can be realized that by arranging measuring plates on both sides of the drive shaft, and the measuring plates can longitudinally slide along the outer side surface of the drive shaft, thereby driving the sliding rods to leave a movement track in the sand groove. According to the movement track, it can be judged whether the drive shaft is straight, thereby improving the measurement accuracy.

Description

Technical Field

[0001] The present invention relates to the field of drive shaft detection, and more specifically, to a drive shaft quality detection device and method thereof. Background Art

[0002] An automotive drive shaft is a shaft that can transmit power in a universal drive device. It is a high-speed rotating body with few supports and is an important core component in the automotive drive system. During production and assembly, the outer diameter dimension of this component is very strict. If there is a slight carelessness, defective products are likely to flow into the market, resulting in failure to assemble or unqualified assembly. Therefore, the detection of the outer diameter of the drive shaft is an extremely important process in the drive shaft quality detection process.

[0003] The existing methods for detecting the outer diameter of drive shafts mostly involve manual measurement of the outer diameter or measurement using simple clamping measurement equipment. Most of them can only measure the outer diameter of one drive shaft product at a time, with low measurement efficiency.

[0004] Chinese Patent with the authorization announcement number CN 212747610 U discloses an automotive drive shaft detection device, providing a technical solution. The electric telescopic rod drives the lifting plate to move downward, thereby driving the measurement pressure plate to contact the upper end of the drive shaft in multiple arc-shaped placement grooves on the base, and then reading the outer diameter of the drive shaft through a micrometer.

[0005] Although the above patent can measure the outer diameters of multiple drive shafts at one time, the outer surface of the drive shaft may be uneven during the production process, and the above patent can only measure the outer diameter at a certain fixed position of the drive shaft and cannot measure the entire drive shaft, which is likely to cause measurement errors.

[0006] Therefore, a drive shaft quality detection device and method thereof are proposed. Summary of the Invention

[0007] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a drive shaft quality detection device and method thereof, which can achieve.

[0008] To solve the above problems, the present invention adopts the following technical solutions.

[0009] A drive shaft quality detection device includes a base. Two groups of conveying frames are symmetrically and fixedly connected to the left and right near the center position of the upper end surface of the base. One end of the upper end surfaces of the two groups of conveying frames close to each other is fixedly connected with a support plate. The two groups of conveying frames are fixedly connected by a bracket, and the lower end surface of the bracket is fixedly connected to the base through three legs evenly distributed.

[0010] A longitudinally movable clamp is suspended between the two support plates on each group of the conveying racks, two measuring plates are elastically connected to the left and right sides of the inner side of the clamp by two pillars, and a sliding rod of an L-shaped structure is fixedly connected to the side of the pillars away from each other, and a pressure plate is suspended above the clamp, and fixed plates are symmetrically fixedly connected to the lower ends of the vertical parts on the front and rear sides of the pressure plate, and a sand trough is fixedly connected between the two longitudinally distributed fixed plates.

[0011] Furthermore, a pointer is fixedly connected to one side of the rear side surfaces of the two measuring plates on the inner side of each clamp plate, and scale lines are horizontally engraved on the horizontal part of the rear side surface of the clamp plate.

[0012] Furthermore, the upper end surface of the bracket is fixedly connected to a U-shaped hanger at the outer side of the two longitudinally distributed support plates, and the lower end surface of the hanger is symmetrically fixedly connected to two electric push rods, and the telescopic ends of the electric push rods are fixedly connected to the upper end surface of the pressure plate.

[0013] Furthermore, a slide plate is provided between the two pressure plates, and a T-shaped slide groove is opened at the center position of the lower end surface of the pressure plate. The left and right ends of the upper end surface of the slide plate are fixedly connected with sliding blocks matching the slide groove, and the left and right ends of the lower end surface of the slide plate are fixedly connected with hydraulic push rods, and the telescopic ends of the hydraulic push rods are respectively fixedly connected to the upper end surfaces of the splints at corresponding positions.

[0014] Furthermore, the vertical plate parts of the two hangers are both provided with slots, and a frame is slidably connected between the two transversely distributed slots, and the left and right ends of the frame are respectively fixedly connected to the outer side surfaces of the vertical parts of the pressure plates at corresponding positions.

[0015] Furthermore, a servo motor is fixedly connected to the center position of the upper end surface of the rear frame, a rod rack is fixedly connected to the center position of the upper end surface of the front frame, a screw rod is fixedly connected to the end of the output shaft of the servo motor, the front end of the screw rod is rotatably connected to the rod rack, and the slide plate is spirally connected to the screw rod.

[0016] Furthermore, a pressure sensor is fixedly connected to the center position of the upper end surface inside the clamping plate, a display is fixedly connected to the upper end surface of the rear bracket, and the pressure sensor is electrically connected to the display.

[0017] Furthermore, a plurality of rollers are equidistantly and laterally connected to the inner side of each conveying frame, and the rollers are connected to each other through a conveyor belt transmission. A plurality of plate sleeves are symmetrically and equidistantly distributed on the outer side of the conveyor belt. The inner bottom surface of the plate sleeve is elastically connected to a frame plate with an arc structure through a spring.

[0018] The roller shafts of the rollers on the inner sides of the two conveying frames close to each other respectively penetrate to the front side of the conveying frame and are fixedly connected with gears through one-way bearings. Tooth plates are fixedly connected to the fixing plates corresponding to the gears on the front sides of the two sand grooves. A flow guide plate is fixedly connected to the center position of the upper end surface of the base, and baffle plates are fixedly connected to the left and right ends of the upper end surface of the base.

[0019] Further, sleeves are evenly distributed on the outer side surface of the vertical part of the clamping plate below the support column, and elastic blocks are elastically connected in the sleeves through springs. Convex blocks are evenly distributed on one side of the sand groove corresponding to the clamping plate.

[0020] A method for a transmission shaft quality detection device includes the following steps:

[0021] S1: First, place the transmission shafts to be detected on both of the two shelf plates longitudinally distributed above the conveyor belt.

[0022] S2: Subsequently, start the electric push rods in the two hanging frames to push the pressing plates downward. As the pressing plates continue to move downward, the two pressing plates respectively press the transmission shafts on the support plates to complete the fixation of the transmission shafts.

[0023] S3: Then start the two hydraulic push rods to drive the clamping plates to move downward, so that the two measuring plates inside the clamping plates clamp the transmission shaft. Finally, start the servo motor to drive the sliding plate to slide from front to back, so that the measuring plates move from front to back along the outer side surface of the transmission shaft, making the sliding rods leave movement tracks in the sand grooves. Observing the tracks can determine whether the transmission shaft is straight, and observing the pointer can read out the outer diameter of the transmission shaft.

[0024] S4: After the detection is completed, start the electric push rod to drive the tooth plate to rise. At this time, the one-way bearings between the gears and the roller shafts are in a locked state, so as to drive the two gears to rotate towards each other, and then drive the conveyor belt to convey towards each other, so that the detected rotating shafts are conveyed to the position of the flow guide plate, and the next transmission shaft to be detected is conveyed below the pressing plate.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. In this solution, measuring plates are arranged on both sides of the transmission shaft, and the measuring plates can slide longitudinally along the outer side surface of the transmission shaft, so as to drive the sliding rods to leave movement tracks in the sand grooves. According to the movement tracks, it can be determined whether the transmission shaft is straight, thereby improving the measurement accuracy.

[0027] 2. In this solution, the roller shafts of the rollers close to each other inside the conveying frame respectively penetrate to the front side of the conveying frame and are fixedly connected with gears through one-way bearings. When the toothed plate moves downward and contacts the gears, the one-way bearings between the gears and the roller shafts are in an active state, so that the conveyor belt remains stationary. After the detection is completed, when the toothed plate rises and resets, the one-way bearings between the gears and the roller shafts are in a locked state, driving the two gears to rotate towards each other, and then driving the conveyor belt to convey towards each other, so that the detected rotating shaft is conveyed to the position of the guide plate, and the next rotating shaft to be detected is conveyed under the pressing plate, facilitating the loading and unloading of the rotating shaft and improving the detection efficiency.

[0028] 3. After the detection of the rotating shaft is completed in this solution, the hydraulic push rod drives the clamping plate to rise. During the rising process of the clamping plate, the elastic block in the sleeve will intermittently contact the convex block on the sand groove. When the elastic block is squeezed by the cam, it will retract into the sleeve and compress the spring. After the elastic block leaves the convex block, the elastic block rebounds under the action of the spring, hitting the sand groove, causing the sand groove to vibrate, so that the fine sand in the sand groove is evenly vibrated, removing the previous traces, thus preparing for the next detection and ensuring that the fine sand in the sand groove can continuously play a role. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a front perspective schematic diagram of the overall structure of the present invention;

[0030] Figure 2 It is a rear perspective schematic diagram of the overall structure of the present invention;

[0031] Figure 3 For the present invention Figure 1 Semi-sectional schematic diagram of the middle slide plate position;

[0032] Figure 4 It is an exploded schematic diagram of the overall structure of the present invention;

[0033] Figure 5 For the present invention Figure 3 Enlarged schematic diagram at A in the present invention;

[0034] Figure 6 For the present invention Figure 3 Enlarged schematic diagram at B in the present invention;

[0035] Figure 7 For the present invention Figure 4 Enlarged schematic diagram at C in the present invention;

[0036] Figure 8 For the present invention Figure 4 Enlarged schematic diagram at D in the present invention;

[0037] Figure 9 For the present invention Figure 2 Enlarged schematic diagram at E in the present invention.

[0038] Description of reference numerals in the figure:

[0039] 1. Base; 11. Flow deflector; 12. Baffle; 13. Conveyor frame; 14. Conveyor belt; 15. Support plate; 16. Bracket; 17. Plate sleeve; 18. Frame plate; 2. Hanging bracket; 21. Notch; 22. Electric push rod; 23. Pressure plate; 24. Hydraulic push rod; 25. Clamping plate; 26. Pressure sensor; 27. Display; 28. Pointer; 29. Scale line; 3. Measuring plate; 31. Support pillar; 32. Slide bar; 33. Sleeve; 34. Elastic block; 4. Sand groove; 41. Fixed plate; 42. Toothed plate; 43. Gear; 44. Protrusion; 5. Slide plate; 51. Slide block; 52. Slide groove; 53. Frame; 54. Servo motor; 55. Lead screw; 56. Rod frame. Specific embodiments

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] Embodiment 1:

[0042] Please refer to Figures 1 to 9 , a quality inspection device for a drive shaft, including a base 1. Two groups of conveyor frames 13 are symmetrically and fixedly connected to the upper end surface of the base 1 near the center position on the left and right. At one end of the upper end surfaces of the two groups of conveyor frames 13 close to each other, support plates 15 are fixedly connected. The two groups of conveyor frames 13 are fixedly connected by a bracket 16, and the lower end surface of the bracket 16 is fixedly connected to the base 1 through three legs evenly distributed;

[0043] Clamping plates 25 that can move longitudinally are suspended at the positions between the two support plates 15 on each conveyor frame 13. Two measuring plates 3 are elastically connected to the left and right sides of the inner side of the clamping plate 25 through two support pillars 31. L-shaped slide bars 32 are fixedly connected to the sides of the support pillars 31 away from each other. A pressure plate 23 is suspended above the clamping plate 25. Fixed plates 41 are symmetrically and fixedly connected to the lower ends of the vertical parts on the front and rear sides of the pressure plate 23, and sand grooves 4 are fixedly connected between the two longitudinally distributed fixed plates 41;

[0044] Pointers 28 are fixedly connected to the sides of the rear sides of the two measuring plates 3 on the inner side of each clamping plate 25 close to each other, and scale lines 29 are transversely engraved on the horizontal part of the rear side of the clamping plate 25;

[0045] At the outer side positions of the two support plates 15 distributed longitudinally on the upper end surface of the bracket 16, a hanger 2 with a U-shaped structure is fixedly connected. At the front and rear symmetry positions on the lower end surface of the hanger 2, two electric push rods 22 are fixedly connected. The telescopic ends of the electric push rods 22 are fixedly connected to the upper end surface of the pressure plate 23. A sliding plate 5 is arranged between the two pressure plates 23. At the central positions on the lower end surfaces of the pressure plates 23, chutes 52 with a T-shaped structure are respectively opened. At the left and right ends of the upper end surface of the sliding plate 5, sliding blocks 51 matching the chutes 52 are fixedly connected. At the left and right ends of the lower end surface of the sliding plate 5, hydraulic push rods 24 are fixedly connected. The telescopic ends of the hydraulic push rods 24 are respectively fixedly connected to the upper end surfaces of the clamping plates 25 at the corresponding positions;

[0046] Notches 21 are respectively opened in the vertical plate parts of the two hangers 2, and a frame 53 is slidably connected between the two notches 21 distributed horizontally. The left and right ends of the frame 53 are respectively fixedly connected to the outer sides of the vertical parts of the pressure plates 23 at the corresponding positions. At the central position on the upper end surface of the rear frame 53, a servo motor 54 is fixedly connected. At the central position on the upper end surface of the front frame 53, a rod frame 56 is fixedly connected. The end of the output shaft of the servo motor 54 is fixedly connected to a lead screw 55. The front end of the lead screw 55 is rotatably connected to the rod frame 56. The sliding plate 5 is in screw drive connection with the lead screw 55;

[0047] A number of rollers are rotatably connected horizontally and equidistantly inside each conveying frame 13, and the rollers inside each conveying frame 13 are driven by a conveyor belt 14. A number of groups of plate sleeves 17 are symmetrically and equidistantly distributed on the front and rear sides of the outer surface of the conveyor belt 14. The inner bottom surface of the plate sleeve 17 is elastically connected with a frame plate 18 with an arc-shaped structure through a spring;

[0048] The roller shafts of the rollers on the inner sides of the two conveying frames 13 close to each other respectively penetrate to the front side of the conveying frame 13 and are fixedly connected with gears 43 through one-way bearings. Tooth plates 42 are respectively fixedly connected to the fixing plates 41 corresponding to the gears 43 on the front side surfaces of the two sand grooves 4. At the central position on the upper end surface of the base 1, a guide plate 11 is fixedly connected, and baffles 12 are fixedly connected to the left and right ends of the upper end surface of the base 1.

[0049] By adopting the above technical solution, first, the drive shafts to be detected are successively placed on two mounting plates 18 arranged longitudinally above two conveyor belts 14. The upper part of the mounting plate 18 is in an arc-shaped groove structure to adapt to drive shafts with different outer diameters. And the drive shaft near the deflector 11 above the conveyor belt 14 is located directly below the pressing plate 23. Initially, the sliding plate 5 is located above the front mounting plate 18, and the hydraulic push rod 24 is in a contracted state. After the drive shafts are arranged, the electric push rods 22 inside the two hanging frames 2 are started simultaneously to drive the two pressing plates 23 to descend. During the descent of the pressing plate 23, the toothed plate 42 on the fixing plate 41 will contact the corresponding gear 43. At this time, the one-way bearing between the gear 43 and the roller shaft is in an active state, so as to ensure that the conveyor belt 14 does not rotate, and further ensure that the drive shaft to be detected remains stationary. The vertical parts on the front and rear sides of the pressing plate 23 are aligned with the support plate 15. As the pressing plate 23 continues to descend, it can squeeze the upper end of the drive shaft. Since the lower part of the mounting plate 18 is elastically connected to the inner bottom surface of the plate sleeve 17 through a spring, the mounting plate 18 can move downward along the plate sleeve 17 until the lower end of the drive shaft contacts the upper end surface of the support plate 15. The upper end surface of the support plate 15 is provided with a groove in a circular arc structure to adapt to drive shafts with different outer diameters. The lower end surfaces of the vertical parts on the front and rear sides of the pressing plate 23 are also provided with grooves in a circular arc structure, so as to adapt to drive shafts with different outer diameters, improving the scope of application. Through the cooperation of the pressing plate 23 and the support plate 15, the drive shaft is stably clamped and fixed, preventing it from shifting during the detection process;

[0050] Subsequently, start the hydraulic push rod 24 to drive the clamping plate 25 to descend, causing the measuring plate 3 to descend together. Since the support column 31 is slidably connected to the central position of the vertical part of the clamping plate 25, and a spring is sleeved on the annular outer side of the position between the support column 31 and the measuring plate 3, an elastic connection is formed between the measuring plate 3 and the vertical part of the clamping plate 25. Moreover, the lower ends of the corresponding sides of the two measuring plates 3 on the inner side of each clamping plate 25 are arc-shaped, enabling the lower end of the measuring plate 3 to smoothly slide down along the annular outer side of the transmission shaft when contacting the upper end of the transmission shaft, thereby clamping the transmission shaft between the two measuring plates 3. The vertical part of the slide rod 32 on the support column 31 is inserted into the fine sand in the sand groove 4. At this time, the pointer 28 on the measuring plate 3 points to the scale line 29 on the rear side of the horizontal part of the clamping plate 25. By reading the scale value, the outer diameter of the transmission shaft can be obtained. Subsequently, start the servo motor 54 to drive the lead screw 55 to rotate. Since the slide plate 5 is in screw transmission connection with the lead screw 55, and the left and right ends of the upper end surface of the slide plate 5 are slidably connected to the chute 52 on the lower end surface of the horizontal part of the pressing plate 23 through the T-shaped sliders 51, the slide plate 5 is driven to slide backward along the chute 52, and then the measuring plate 3 is driven to slide backward along the outer side of the transmission shaft, causing the slide rod 32 to leave a movement track on the fine sand in the sand groove 4. Since the measuring plate 3 is elastically connected to the clamping plate 25, when the outer side of the transmission shaft is not straight, the measuring plate 3 will expand outward or contract inward, thereby changing the movement track of the slide rod 32. Then, it can be judged whether the transmission shaft is straight by observing the track formed on the fine sand in the sand groove 4. If the track is straight, it indicates that the transmission shaft is straight and the outer diameter measured by the measuring plate 3 is accurate. If the track is not straight, it means that the transmission shaft does not meet the production requirements. In this way, the positions longitudinally distributed on the outer side of the transmission shaft are all measured, increasing the measurement range, reducing the measurement error, and improving the detection accuracy;

[0051] After the detection is completed, start the hydraulic push rod 24 again to drive the clamping plate 25 to rise and reset. Subsequently, start the electric push rod 22 to drive the pressing plate 23 to rise and reset, causing the support plate 18 to drive the transmission shaft to leave the support plate 15 under the action of the spring after losing the extrusion of the pressing plate 23. During the rising process of the pressing plate 23, the one-way bearing between the gear 43 and the roller shaft is in a locked state, so that the two toothed plates 42 drive the two gears 43 to rotate towards each other simultaneously, and then drive the two conveyor belts 14 to rotate towards each other, causing the detected transmission shaft to be conveyed below the conveying frame 13. The two transmission shafts fall off the support plate 18 under the action of gravity and respectively drop onto the arc-shaped inclined surfaces of the diversion plates 11, and roll along the arc-shaped inclined surfaces of the diversion plates 11 to the baffles 12 at the corresponding positions, facilitating the collection of the transmission shafts. After driving the pressing plate 23 to reset, the next transmission shaft to be detected happens to be conveyed directly below the pressing plate 23 waiting for detection, facilitating the loading and unloading of the transmission shafts and improving the detection efficiency.

[0052] As Figure 2 and Figure 7As shown in the figure, pressure sensors 26 are fixedly connected to the center positions of the upper end faces inside the clamping plates 25. A display 27 is fixedly connected to the upper end face of the rear support bracket 16, and the pressure sensors 26 are electrically connected to the display 27.

[0053] By adopting the above technical solution, when it is necessary to detect the compressive strength of the transmission shaft, the lead screw 55 is rotated by the servo motor 54 to adjust the sliding plate 5 to the center position between the two pressing plates 23. Subsequently, the electric push rod 22 is started to drive the pressing plate 23 to press the transmission shaft against the support plate 15. Then, the hydraulic push rod 24 is driven to drive the clamping plate 25 to continuously descend, so that the pressure sensor 26 at the center position of the upper end face inside the clamping plate 25 contacts the center position of the upper end of the transmission shaft until the transmission shaft is bent and deformed. The compressive strength curve of the transmission shaft is observed and recorded through the display 27 on the rear support bracket 16, thus broadening the detection range.

[0054] As Figure 1 、 Figure 4 and Figure 8 shown in the figure, sleeves 33 are evenly distributed on the outer side surface of the vertical part of the clamping plate 25 below the support columns 31, and elastic blocks 34 are elastically connected to the sleeves 33 through springs. Convex blocks 44 are evenly distributed on one side of the sand groove 4 corresponding to the clamping plate 25.

[0055] By adopting the above technical solution, after the detection is completed, first, the hydraulic push rod 24 is started to drive the clamping plate 25 to rise and reset. During the rising process of the clamping plate 25, the elastic block 34 will intermittently contact the convex block 44 at the corresponding position on the sand groove 4. The contacting parts of the elastic block 34 and the convex block 44 are both in a hemispherical structure, thereby reducing the frictional resistance between the elastic block 34 and the convex block 44 and facilitating the elastic block 34 to retract into the sleeve 33 under the extrusion of the convex block 44. When the elastic block 34 passes by the convex block 44, the elastic block 34 rebounds under the action of the spring, thereby generating a vibration force on the sand groove 4. As the pressing plate 23 continuously rises, the sand groove 4 receives a continuous vibration force, so that the fine sand inside the sand groove 4 vibrates. The fine sand is vibrated flat under the action of the continuous vibration force, thereby eliminating the trajectory left by the sliding rod 32. And when the pressing plate 23 descends again for detection, it will also generate a vibration force on the sand groove 4 again, making the fine sand vibrate further, improving the elimination effect of the trajectory, ensuring that the trajectory formed by the sliding rod 32 during the subsequent measurement process will not be interfered by the previous trajectory, and ensuring that the fine sand can continuously play its role.

[0056] A method for a transmission shaft quality detection device includes the following steps:

[0057] S1: First, place the transmission shafts to be detected on both of the two support plates 18 longitudinally distributed above the conveyor belt 14;

[0058] S2: Subsequently, start the electric push rods 22 in the two hanging brackets 2 to push the pressing plates 23 downward. As the pressing plates 23 continue to move downward, the two pressing plates 23 press the transmission shaft against the support plates 15 respectively, completing the fixation of the transmission shaft.

[0059] S3: Then start the two hydraulic push rods 24 to drive the clamping plates 25 to move downward, so that the two measuring plates 3 on the inner sides of the clamping plates 25 clamp the transmission shaft. Finally, start the servo motor 54 to drive the slide plate 5 to slide from front to back, so that the measuring plates 3 move from front to back along the outer side of the transmission shaft, making the slide rods 32 leave movement tracks in the sand grooves 4. By observing the tracks, it can be judged whether the transmission shaft is straight, and by observing the pointer 28, the outer diameter of the transmission shaft can be read.

[0060] S4: After the detection is completed, start the electric push rod 22 to drive the toothed plate 42 to rise. At this time, the one-way bearing between the gear 43 and the roller shaft is in a locked state, so as to drive the two gears 43 to rotate towards each other, and then drive the conveyor belt 14 to convey towards each other, so that the detected rotating shaft is conveyed to the position of the guide plate 11, and the next transmission shaft to be detected is conveyed below the pressing plate 23.

[0061] As described above, it is only the preferred specific implementation manner of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

Claims

1. A drive shaft quality inspection device, comprising a base (1), characterized in that: On the upper end surface of the base (1), two sets of conveying frames (13) are symmetrically and fixedly connected on the left and right near the center position. At one end of the upper end surfaces of the two sets of conveying frames (13) close to each other, support plates (15) are fixedly connected. The two sets of conveying frames (13) are fixedly connected by a bracket (16), and the lower end surface of the bracket (16) is fixedly connected to the base (1) through three legs evenly distributed at equal intervals; At the position between the two support plates (15) on each set of conveying frames (13), a longitudinally movable clamping plate (25) is suspended. On the left and right sides of the inner side of the clamping plate (25), two measuring plates (3) are elastically connected by two support columns (31). On the side of the support columns (31) away from each other, L-shaped sliding rods (32) are fixedly connected. Above the clamping plate (25), a pressing plate (23) is suspended. At the lower end positions of the vertical parts on the front and rear sides of the pressing plate (23), fixing plates (41) are symmetrically and fixedly connected on the left and right, and a sand groove (4) is fixedly connected between the two longitudinally distributed fixing plates (41); On the inner side of each set of conveying frames (13), a number of rollers are rotatably connected horizontally at equal intervals, and the rollers on the inner side of each set of conveying frames (13) are driven by a conveyor belt (14). On the outer front surface of the conveyor belt (14), several groups of plate sleeves (17) are symmetrically and evenly distributed in the front and rear. The inner bottom surface of the plate sleeve (17) is elastically connected to an arc-shaped frame plate (18) by a spring; The roller shafts of the rollers on the inner sides of the two conveying frames (13) close to each other respectively penetrate to the front side of the conveying frame (13) and are fixedly connected with gears (43) through one-way bearings. On the fixing plates (41) corresponding to the gears (43) on the front side surfaces of the two sand grooves (4), toothed plates (42) are fixedly connected. At the center position of the upper end surface of the base (1), a diversion plate (11) is fixedly connected, and baffles (12) are fixedly connected to the left and right ends of the upper end surface of the base (1).

2. The quality inspection device for a drive shaft according to claim 1, wherein: On the rear side surfaces of the two measuring plates (3) on the inner side of each clamping plate (25), pointers (28) are fixedly connected to the side close to each other. On the horizontal part of the rear side surface of the clamping plate (25), scale lines (29) are engraved horizontally.

3. The quality inspection device for a drive shaft according to claim 2, wherein: On the upper end surface of the bracket (16) at the position outside the two longitudinally distributed support plates (15), a U-shaped hanger (2) is fixedly connected. At the front and rear of the lower end surface of the hanger (2), two electric push rods (22) are symmetrically and fixedly connected. The telescopic ends of the electric push rods (22) are fixedly connected to the upper end surface of the pressing plate (23).

4. A quality inspection device for a drive shaft according to claim 3, characterized in that: A sliding plate (5) is arranged between the two pressing plates (23). At the center position of the lower end surface of the pressing plate (23), T-shaped chutes (52) are opened. On the left and right ends of the upper end surface of the sliding plate (5), sliding blocks (51) matching the chutes (52) are fixedly connected. The left and right ends of the lower end surface of the sliding plate (5) are fixedly connected with hydraulic push rods (24) respectively, and the telescopic ends of the hydraulic push rods (24) are fixedly connected to the upper end surfaces of the corresponding clamping plates (25).

5. The quality inspection device for a drive shaft according to claim 4, wherein: Notches (21) are formed in the vertical plate portions of the two hanging brackets (2), and a frame (53) is slidably connected between the two horizontally distributed notches (21). The left and right ends of the frame (53) are respectively fixedly connected to the outer sides of the vertical portions of the pressure plates (23) at corresponding positions.

6. The quality inspection device for a drive shaft according to claim 5, wherein: A servo motor (54) is fixedly connected to the center of the upper end surface of the rear frame (53), and a rod frame (56) is fixedly connected to the center of the upper end surface of the front frame (53). The end of the output shaft of the servo motor (54) is fixedly connected to a lead screw (55). The front end of the lead screw (55) is rotatably connected to the rod frame (56). The slide plate (5) is in screw drive connection with the lead screw (55).

7. An axle shaft quality inspection device according to claim 6, characterized in that: Pressure sensors (26) are fixedly connected to the centers of the upper end surfaces inside the clamping plates (25). A display (27) is fixedly connected to the upper end surface of the rear bracket (16), and the pressure sensors (26) are electrically connected to the display (27).

8. An in-line shaft quality inspection device according to claim 7, wherein: Sleeves (33) are evenly distributed on the outer sides of the vertical portions of the clamping plates (25) below the support columns (31). Elastic blocks (34) are elastically connected in the sleeves (33) through springs. Convex blocks (44) are evenly distributed on one side of the sand groove (4) corresponding to the clamping plate (25).

9. A method applicable to a quality inspection device for a drive shaft as described in any one of claims 1-8, characterized in that: Including the following steps: S1: First, place the transmission shafts to be detected on the two longitudinal distribution rack plates (18) above the conveyor belt (14). S2: Subsequently, start the electric push rods (22) in the two hanging brackets (2) to push the pressure plates (23) downward. As the pressure plates (23) continue to move downward, the two pressure plates (23) respectively press the transmission shafts on the support plates (15) to complete the fixation of the transmission shafts. S3: Then start the two hydraulic push rods (24) to drive the clamping plates (25) downward, so that the two measuring plates (3) inside the clamping plates (25) clamp the transmission shaft. Finally, start the servo motor (54) to drive the slide plate (5) to slide from front to back, so that the measuring plates (3) move from front to back along the outer side of the transmission shaft, so that the slide rods (32) leave a movement track in the sand groove (4). Observing the track can judge whether the transmission shaft is straight, and observing the pointer (28) can read the outer diameter of the transmission shaft. S4: After the detection is completed, start the electric push rod (22) to drive the toothed plate (42) to rise. At this time, the one-way bearing between the gear (43) and the roller shaft is in a stuck state, so as to drive the two gears (43) to rotate towards each other, and then drive the conveyor belt (14) to convey towards each other, so that the detected rotating shaft is conveyed to the position of the guide plate 11, and the next transmission shaft to be detected is conveyed below the pressure plate (23).

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