Crankshaft assembly surface defect automatic detection device

Abstract

In order to solve the problems of high labor intensity, low detection efficiency, easy missing detection and false detection and the like of a crankshaft assembly surface defect detection method in the prior art, the invention provides a crankshaft assembly surface defect automatic detection device which comprises a base plate, a conveying mechanism, a blocking mechanism, a lifting mechanism, a rotating mechanism, a detection mechanism and a controller, the conveying mechanism is arranged in the middle of the base plate. The two blocking mechanisms are fixed to the left side and the right side of the tail end of the conveying mechanism correspondingly. The two lifting mechanisms are fixed to the two outer sides of the blocking mechanism correspondingly. The two rotating mechanisms are transversely arranged on the two outer sides of the lifting mechanism in a mirror symmetry mode. The detection mechanism comprises a door-shaped support, an illuminating lamp and a camera. The beneficial effects of the invention are that an automatic detection mode is adopted, the labor intensity is effectively reduced, the detection efficiency is improved, and the occurrence of missed detection, false detection and the like is avoided.

Description

Technical Field

[0001] The invention relates to an automatic detection technology for surface defects of a crankshaft assembly, and in particular to an automatic detection device for surface defects of a crankshaft assembly. Background Art

[0002] The engine crankshaft contains four main components, namely the left crank, the right crank, the crank shaft and the connecting rod. The shapes of the left crank and the right crank are roughly the same, both including a crank disk and a crank rod; the crank rod is arranged at the center of the crank disk, and a crank shaft through hole is arranged at an eccentric position of the crank disk. The left crank and the right crank are connected as a whole through the crank shaft, and the connecting rod is mounted on the crank shaft, thereby forming the engine crankshaft. Usually, the left crank, the right crank and the crank shaft are fixedly connected as a whole by the interference fit of the crank shaft through holes on the left crank and the right crank and the crank shaft, and the connecting rod is mounted on the middle section of the crank shaft to form a sliding or rotatable fit. After the engine crankshaft is assembled, the bearings, gears, oil slingers and other components must be pressed onto the crank rod by interference fit in several times to complete the assembly of the engine crankshaft assembly (see attached Figure 1 , in the figure, a is the left crank, b is the right crank, c is the crankshaft, d is the connecting rod, e is the bearing, f is the gear, and g is the oil slinger). Since the crankshaft assembly of the engine needs to be pressed, inspected and transported many times during assembly, it is easy to cause defects on the surface of the crankshaft assembly. Such as scratches, cracks, rust and dirt. In addition, in the process of pressing and assembly of various parts, some production defects are also easy to cause, such as missing assembly, over-assembly, missing processing and reverse installation of gears. In order to prevent products with the above-mentioned surface defects from leaving the factory, a factory inspection must be carried out before storage, that is, surface defect detection is carried out on each crankshaft assembly to be stored. The prior art method for detecting surface defects of crankshaft assemblies uses manual surface defect detection on crankshaft assemblies to be stored piece by piece, that is, the crankshaft assembly is placed under the irradiation of a UV lamp or other lighting source for manual observation; or, a simple clamp is equipped to clamp the crankshaft assembly between two ejector pins, and with the assistance of a UV lamp or other lighting source, the connecting rod is manually shaken to make the crankshaft assembly rotate between the two ejector pins for manual observation.

[0003] Obviously, the existing crankshaft assembly surface defect detection method has the problems of high labor intensity, low detection efficiency and easy missed detection and false detection. Summary of the invention

[0004] In order to solve the problems of high labor intensity, low detection efficiency and easy missed detection and false detection in the prior art crankshaft assembly surface defect detection method, the present invention proposes an automatic crankshaft assembly surface defect detection device.

[0005] The automatic detection device for the surface defects of the crankshaft assembly of the present invention comprises a base plate, a transmission mechanism, a blocking mechanism, a lifting mechanism, a rotating mechanism, a detection mechanism and a controller; the base plate is a T-shaped plate, and the transmission mechanism, the blocking mechanism, the lifting mechanism, the rotating mechanism and the detection mechanism are arranged on the base plate; the transmission mechanism is arranged in the middle of the base plate, and comprises a conveyor belt support, a sprocket, a conveyor belt, a motor I, a motor seat, a slide slot support, a slide slot, an end support and an inclined slide slot; there are two conveyor belt supports, one in front and one in the back, which are fixed on the central axis of the base plate, and a rotating shaft is arranged at the upper end of the conveyor belt support; there are four sprockets, which are respectively fixed on the two ends of the rotating shaft; there are two conveyor belts, which are respectively wound on two sprockets on the same surface, and comprise a conveyor chain and V-shaped seat; the V-shaped seat is fixed on the upper surface of the transmission chain; the motor I is fixed on the side of the front sprocket through the motor seat, and the rotating shaft of the motor I is connected to the rotating shaft of the front sprocket; there are several slide groove supports, which are fixed on the central axis of the base plate at intervals from front to back; the cross-sectional shape of the slide groove is concave, fixedly mounted on the upper surface of the slide groove support and is located in the middle of the two conveyor belts; wherein the size of the concave shape of the slide groove matches the radial cross-section of the crankshaft assembly, that is, when the crank of the crankshaft assembly is placed in the middle cavity of the concave shape, the size of the middle cavity is the same as the outer contour of the crank of the crankshaft assembly, and the left bearing of the crankshaft assembly is just placed on the left step of the middle cavity, and the root of the right crank crank of the crankshaft assembly is just placed in the middle on the right step of the intermediate cavity; the shape and height of the V-shaped seat are based on the crank of the crankshaft assembly being placed in the concave middle cavity, and the crank rods on both sides are just placed in the V-shaped seat; the end support is fixed to the end of the central axis of the base plate; one end of the inclined slide is fixed to the end of the slide, and the other end is fixed to the end support; there are two blocking mechanisms, which are respectively fixed on the left and right sides of the end of the transmission mechanism; including base I, cylinder I, guide column I, slider I and blocking arm; the base I is a rectangular parallelepiped, which is vertically fixed on the base plate; the piston of the cylinder I is upwardly fixed to the middle part of the surface of the base I; there are two guide columns I, which are vertically fixed on the bases on both sides of the cylinder I; the slider I is slidably installed on the guide column I; the blocking arm is a long strip, fixed The lifting mechanism is fixed in the middle of the upper surface of the slider I, and an L-shaped notch is provided at the upper end of the blocking arm; there are two lifting mechanisms, which are respectively fixed on the two outer sides of the blocking mechanism; including a base II, a cylinder II, a guide column II, a slider II and a lifting arm; the structure and composition of the lifting mechanism are the same as those of the blocking mechanism, the only difference is that the blocking arm is replaced by a lifting arm, and a V-shaped notch is provided at the upper end of the lifting arm; there are two rotating mechanisms, which are arranged on the two outer sides of the lifting mechanism in a transverse mirror symmetric manner; wherein the rotating mechanism on one side is provided with a motor II, and the rotating mechanism on the other side is not provided with a motor II; including a base III, a slider III, a pin, a gear I, a motor II, a gear II, a cylinder III, and a cylinder seat; the base III has a cubic structure, and a trapezoidal slide is provided on the upper surface of the base III;The slider is a cubic structure, slidably mounted in the trapezoidal slideway of the base, a circular through hole is provided on the front side of the slider, and a rectangular notch is provided on the rear side of the slider; the ejector pin is rotatably mounted in the circular through hole of the slider; the gear I is fixed to the end of the ejector pin; the motor II is installed in the rectangular notch of the slider; the gear II is fixed on the rotating shaft of the motor II and meshes with the gear I; the cylinder III is fixed on the base plate through the cylinder seat, and the piston of the cylinder III is fixedly connected to the rear end of the slider; wherein, the ejector pin shaft of the left and right rotating mechanism The line is coaxial with the axis of the crankshaft assembly supported by the V-shaped notch of the lifting arm when the lifting arm of the lifting mechanism is in a high position; the detection mechanism is fixed on the rear side of the rotating mechanism, including a door-type bracket, a lighting lamp and a camera; the two legs of the door-type bracket are respectively fixed on the rear side of the rotating mechanism; the lighting lamp and the camera are both several and fixed on the crossbeam of the door-type bracket; wherein the power switches of the motors I and II, the control valves of the cylinders I, II and III, as well as the lighting lamp and the camera are all electrically connected to the controller. ;

[0006] Furthermore, the conveying chain is a chain plate and chain shaft structure, wherein the chain plate includes a flat chain plate and an L-shaped chain plate; one side of the L-shaped chain plate is provided with a connecting hole, and the other side is provided with a through hole for installing a V-shaped seat; when assembled, the flat chain plate and the L-shaped chain plate are alternately connected to the chain shaft in pairs.

[0007] The beneficial technical effect of the automatic detection device for the surface defects of the crankshaft assembly of the present invention is that it adopts an automated detection mode, effectively reduces labor intensity, improves detection efficiency, and avoids the occurrence of missed detections, false detections, and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Attached Figure 1 It is a three-dimensional schematic diagram of the crankshaft assembly;

[0009] Attached Figure 2 It is a three-dimensional schematic diagram of the automatic detection device for the surface defects of the crankshaft assembly of the present invention;

[0010] Attached Figure 3 It is a three-dimensional schematic diagram of another angle of the automatic detection device for surface defects of a crankshaft assembly of the present invention;

[0011] Attached Figure 4 It is a partial three-dimensional schematic diagram of the automatic detection device for the surface defects of the crankshaft assembly of the present invention;

[0012] Attached Figure 5 It is a three-dimensional schematic diagram of the transmission mechanism of the automatic detection device of the present invention;

[0013] Attached Figure 6 It is a three-dimensional schematic diagram of the conveying chain of the automatic detection device of the present invention;

[0014] Attached Figure 7It is a three-dimensional schematic diagram of the blocking mechanism of the automatic detection device of the present invention;

[0015] Attached Figure 8 It is a three-dimensional schematic diagram of the lifting mechanism of the automatic detection device of the present invention;

[0016] Attached Fig. 9 It is a three-dimensional schematic diagram of the rotating mechanism of the automatic detection device of the present invention;

[0017] Attached Fig.10 It is a three-dimensional schematic diagram of the detection mechanism of the automatic detection device of the present invention;

[0018] Attached Fig.11 It is a three-dimensional schematic diagram of the blocking state of the automatic detection device of the present invention;

[0019] Attached Fig.12 It is a three-dimensional schematic diagram of the lifting state of the automatic detection device of the present invention;

[0020] Attached Fig.13 It is a three-dimensional schematic diagram of the rotation state of the automatic detection device of the present invention.

[0021] In the figure, 1 is a base plate; 2 is a transmission mechanism, 2-1 is a conveyor belt support, 2-2 is a sprocket, 2-3 is a conveyor belt, 2-3-1 is a transmission chain, 2-3-2 is a V-shaped seat, 2-4 is a motor Ⅰ, 2-5 is a motor seat, 2-6 is a slide support, 2-7 is a slide, 2-8 is an end support, and 2-9 is an inclined slide; 3 is a blocking mechanism, 3-1 is a base Ⅰ, 3-2 is a cylinder Ⅰ, 3-3 is a guide column Ⅰ, 3-4 is a slider Ⅰ, and 3-5 is a blocking arm; 4 is a lifting mechanism, 4-1 is a base Ⅱ, 4 -2 is cylinder II, 4-3 is guide column II, 4-4 is slider II, 4-5 is lifting arm; 5 is rotating mechanism, 5-1 is base III, 5-2 is slider III, 5-3 is ejector pin, 5-4 is gear I, 5-5 is motor II, 5-6 is gear II, 5-7 is cylinder III, 5-8 is cylinder seat; 6 is rotating mechanism, 6-1 is door-type bracket, 6-2 is lighting lamp, 6-3 is camera; a is left crank, b is right crank, c is crank shaft, d is connecting rod, e is bearing, f is gear, g is oil-slinging tray.

[0022] The automatic detection device for surface defects of a crankshaft assembly of the present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. DETAILED DESCRIPTION

[0023] Referring to the accompanying drawings, the automatic detection device for the surface defects of the crankshaft assembly of the present invention comprises a base plate 1, a transmission mechanism 2, a blocking mechanism 3, a lifting mechanism 4, a rotating mechanism 5, a detection mechanism 6 and a controller; the base plate is a T-shaped plate, and the transmission mechanism, the blocking mechanism, the lifting mechanism, the rotating mechanism and the detection mechanism are arranged on the base plate; the transmission mechanism is arranged in the middle of the base plate, and comprises a conveyor belt support 2-1, a sprocket 2-2, a conveyor belt 2-3, a motor I 2-4, a motor seat 2-5, a slide slot support 2-6, a slide slot 2-7, an end support 2-8 and an inclined slide slot 2-9; there are two conveyor belt supports, one front and one rear, which are fixed on the central axis of the base plate, and a rotating shaft is arranged at the upper end of the conveyor belt support; there are four sprockets, which are respectively fixed at the two ends of the rotating shaft head; the conveyor belts are two, respectively wound on two sprockets on the same surface, including a conveyor chain 2-3-1 and a V-shaped seat 2-3-2; the V-shaped seat is fixed on the upper surface of the conveyor chain; the motor I is fixed to the side of the front sprocket through the motor seat, and the rotating shaft of the motor I is connected to the rotating shaft of the front sprocket; the slide groove supports are several, fixed on the central axis of the base plate at intervals from front to back; the cross-sectional shape of the slide groove is a concave shape, fixedly mounted on the upper surface of the slide groove support and located in the middle of the two conveyor belts; wherein the size of the concave shape of the slide groove matches the radial cross-section of the crankshaft assembly, that is, when the crank of the crankshaft assembly is placed in the middle cavity of the concave shape, the size of the middle cavity is the same as the outer contour of the crank of the crankshaft assembly, and the crankshaft assembly The left bearing is just placed on the left step of the middle cavity, and the root of the right crank crankshaft assembly is just placed on the right step of the middle cavity; the shape and height of the V-shaped seat are based on the crankshaft assembly being placed in the concave middle cavity, and the cranks on both sides are just placed in the V-shaped seat; the end support is fixed to the end of the central axis of the base plate; one end of the inclined slide is fixed to the end of the slide, and the other end is fixed to the end support; there are two blocking mechanisms, which are respectively fixed on the left and right sides of the end of the transmission mechanism; including base I3-1, cylinder I3-2, guide column I3-3, slider I3-4 and blocking arm 3-5; the base I is a rectangular parallelepiped, which is vertically fixed on the base plate; the piston of the cylinder I is upwardly fixed to the middle of the surface of the base I; There are two guide pillars I, which are vertically fixed on the bases on both sides of the cylinder I; the slider I is slidably installed on the guide pillar I; the blocking arm is long and fixed on the middle of the upper surface of the slider I, and an L-shaped notch is arranged at the upper end of the blocking arm; there are two lifting mechanisms, which are respectively fixed on the two outer sides of the blocking mechanism; including a base II 4-1, a cylinder II 4-2, a guide pillar II 4-3, a slider II 4-4 and a lifting arm 4-5; the structure and composition of the lifting mechanism are the same as those of the blocking mechanism, the only difference is that the blocking arm is replaced by a lifting arm, and a V-shaped notch is arranged at the upper end of the lifting arm; there are two rotating mechanisms, which are arranged on the two outer sides of the lifting mechanism in a transverse mirror symmetric manner; wherein the rotating mechanism on one side is provided with a motor II, and the rotating mechanism on the other side is not provided with a motor II;It includes a base III 5-1, a slider III 5-2, an ejector pin 5-3, a gear I 5-4, a motor II 5-5, a gear II 5-6, a cylinder III 5-7, and a cylinder seat 5-8; the base III is a cubic structure, and a trapezoidal slide is arranged on the upper surface of the base III; the slider is a cubic structure, slidably installed in the trapezoidal slide of the base, a circular through hole is arranged on the front side of the slider, and a rectangular notch is arranged on the rear side of the slider; the ejector pin is rotatably installed in the circular through hole of the slider; the gear I is fixed to the end of the ejector pin; the motor II is installed in the rectangular notch of the slider; the gear II is fixed on the rotating shaft of the motor II and meshes with the gear I; the cylinder III is connected to the cylinder seat It is fixed on the base plate, and the piston of cylinder III is fixedly connected to the rear end of the slider; wherein, the axis of the ejector pin of the left and right rotating mechanisms is coaxial with the axis of the crankshaft assembly supported by the V-shaped notch of the lifting arm when the lifting arm of the lifting mechanism is in a high position; the detection mechanism is fixed on the rear side of the rotating mechanism, including a door-type bracket 6-1, a lighting lamp 6-2 and a camera 6-3; the two legs of the door-type bracket are respectively fixed on the rear side of the rotating mechanism; the lighting lamp and the camera are both several and fixed on the crossbeam of the door-type bracket; wherein, the power switches of the motors I and II, the control valves of the cylinders I, II and III, as well as the lighting lamp and the camera are electrically connected to the controller. During the specific inspection, turn on the power of the lighting and camera; use manual or mechanical hands to place the crankshaft assembly to be inspected on the conveyor belt, pay attention to putting the crank of the crankshaft assembly into the slide, put the bearing of the crankshaft assembly on the step on the left side of the slide, and put the crank rods on both sides of the crankshaft assembly into the V-shaped seat of the transmission belt; turn on the motor I, and the conveyor belt drives the crankshaft assembly to move forward; at the same time, turn on the cylinder I, and the cylinder I pushes the blocking arm to rise to the high position; when the crankshaft assembly moves to the end of the conveyor belt, the crankshaft assembly will escape from the V-shaped seat, slide to the upper end of the inclined slide, and be blocked by the blocking arm (see the attached; Fig.11 ); turn off motor I, the conveyor belt stops running; turn on cylinder II, cylinder II pushes the lifting arm up to the high position, and the V-shaped notch at the upper end of the lifting arm lifts the crankshaft assembly to the high position (see attached Fig.12 ); Close cylinder I, and the blocking arm returns to the low position; open cylinder III, and cylinder III pushes the ejector pins from the left and right sides to enter the center hole of the crankshaft assembly crankshaft end to form a clamping fixation (see attached Fig.13); close cylinder II, and the lifting arm returns to the low position; start motor II, and motor II drives the ejector pin to rotate, thereby driving the crankshaft assembly to rotate; the camera of the detection mechanism takes a picture of the crankshaft assembly, and the controller performs image recognition; if a defect is found, an alarm is issued, and the defective crankshaft assembly is taken out manually or by a robot; if no defect is found, open cylinder II, and the lifting arm rises to a high position; close and open cylinder III, and the ejector pin returns to its original position; open cylinder I, and the blocking arm rises to a high position; close cylinder II, and the lifting arm returns to a low position; the crankshaft assembly is blocked at the upper end of the inclined slot by the blocking arm; close cylinder I, and the blocking arm returns to a low position, and the crankshaft assembly rolls along the inclined slot to the end of the inclined slot, and a qualified crankshaft assembly is taken out manually or by a robot. The automatic detection device for the surface defects of the crankshaft assembly of the present invention adopts the organic cooperation of the conveyor belt, the chute and the inclined chute to transmit to the detection area of ​​the detection mechanism; the blocking arm, the lifting arm and the ejector are organically coordinated to lift, rotate and then put down the crankshaft assembly, and finally transmit it to the end of the inclined chute; the whole process completely avoids the occurrence of falling or collision, and effectively avoids the damage to the crankshaft assembly caused by the automatic detection process. At the same time, the whole detection process is carried out automatically, which effectively reduces the labor intensity, improves the detection efficiency, and avoids the occurrence of missed detection and false detection.

[0024] See attached Figure 6 As one of the preferred technical solutions, the transmission chain is a chain plate and chain shaft structure, wherein the chain plate includes a flat chain plate and an L-shaped chain plate; one side of the L-shaped chain plate is provided with a link hole, and the other side is provided with a through hole for installing a V-shaped seat; during assembly, the flat chain plate and the L-shaped chain plate are alternately linked to the chain shaft in pairs. Setting some of the chain plates in the transmission chain of the chain plate and chain shaft structure as L-shaped chain plates not only ensures the effective operation of the transmission chain, but also facilitates the installation of the V-shaped seat; and the structure is simple and easy to manufacture.

[0025] Obviously, the beneficial technical effect of the automatic detection device for crankshaft assembly surface defects of the present invention is that it adopts an automated detection mode, effectively reduces labor intensity, improves detection efficiency, and avoids the occurrence of missed detections, false detections, and the like.

Claims

1. An automatic detection device for surface defects of a crankshaft assembly, characterized in that: The detection device includes a substrate, a transmission mechanism, a blocking mechanism, a lifting mechanism, a rotating mechanism, a detection mechanism and a controller; the substrate is a T-shaped plate, and the transmission mechanism, the blocking mechanism, the lifting mechanism, the rotating mechanism and the detection mechanism are arranged on the substrate; the transmission mechanism is arranged in the middle of the substrate, and includes a conveyor belt support, a sprocket, a conveyor belt, a motor I, a motor seat, a slide slot support, a slide slot, an end support and an inclined slide slot; there are two conveyor belt supports, one in front and one in the back, which are fixed on the central axis of the substrate, and a rotating shaft is arranged at the upper end of the conveyor belt support; there are four sprockets, which are respectively fixed on the two ends of the rotating shaft; there are two conveyor belts, which are respectively wound on two sprockets on the same surface, including a transmission chain and a V-shaped seat; the V-shaped seat is fixed fixed on the upper surface of the transmission chain; the motor I is fixed on the side of the front sprocket through the motor seat, and the rotating shaft of the motor I is connected to the rotating shaft of the front sprocket; there are several slide groove supports, which are fixed on the central axis of the base plate at intervals from front to back; the cross-sectional shape of the slide groove is a concave shape, which is fixed on the upper surface of the slide groove support and is located in the middle of the two conveyor belts; wherein the size of the concave shape of the slide groove matches the radial cross-section of the crankshaft assembly, that is, when the crank of the crankshaft assembly is placed in the middle cavity of the concave shape, the size of the middle cavity is the same as the outer contour of the crank of the crankshaft assembly, and the left bearing of the crankshaft assembly is just placed on the left step of the middle cavity, and the root of the right crank crank of the crankshaft assembly is just placed on the right side of the middle cavity. on the step; the shape and height of the V-shaped seat are based on the fact that after the crank of the crankshaft assembly is placed in the concave middle cavity, the crank rods on both sides are just placed in the V-shaped seat; the end support is fixed to the end of the central axis of the base plate; one end of the inclined slide is fixed to the end of the slide, and the other end is fixed to the end support; there are two blocking mechanisms, which are respectively fixed on the left and right sides of the end of the transmission mechanism; including base I, cylinder I, guide column I, slider I and blocking arm; the base I is a rectangular parallelepiped, which is vertically fixed on the base plate; the piston of the cylinder I is upwardly fixed to the middle part of the surface of the base I; there are two guide columns I, which are vertically fixed on the bases on both sides of the cylinder I; the slider I is slidably installed on the guide column I; the blocking arm is a long strip, fixed on the slider In the middle of the upper surface of block I, an L-shaped notch is provided at the upper end of the blocking arm; there are two lifting mechanisms, which are respectively fixed on the two outer sides of the blocking mechanism; including base II, cylinder II, guide column II, slider II and lifting arm; the structure and composition of the lifting mechanism are the same as those of the blocking mechanism, the only difference is that the blocking arm is replaced by a lifting arm, and a V-shaped notch is provided at the upper end of the lifting arm; there are two rotating mechanisms, which are arranged on the two outer sides of the lifting mechanism in a transverse mirror symmetric manner; wherein the rotating mechanism on one side is provided with motor II, and the rotating mechanism on the other side is not provided with motor II; including base III, slider III, ejector pin, gear I, motor II, gear II, cylinder III, cylinder seat; the base III is a cubic structure, and a trapezoidal slide is provided on the upper surface of the base III;The slider is a cubic structure, slidably mounted in the trapezoidal slideway of the base, a circular through hole is provided on the front side of the slider, and a rectangular notch is provided on the rear side of the slider; the ejector pin is rotatably mounted in the circular through hole of the slider; the gear I is fixed to the end of the ejector pin; the motor II is installed in the rectangular notch of the slider; the gear II is fixed on the rotating shaft of the motor II and meshes with the gear I; the cylinder III is fixed on the base plate through the cylinder seat, and the piston of the cylinder III is fixedly connected to the rear end of the slider; wherein, the ejector pin shaft of the left and right rotating mechanism The line is coaxial with the axis of the crankshaft assembly supported by the V-shaped notch of the lifting arm when the lifting arm of the lifting mechanism is in a high position; the detection mechanism is fixed on the rear side of the rotating mechanism, including a door-type bracket, a lighting lamp and a camera; the two legs of the door-type bracket are respectively fixed on the rear side of the rotating mechanism; the lighting lamp and the camera are both several and fixed on the crossbeam of the door-type bracket; wherein the power switches of the motors I and II, the control valves of the cylinders I, II and III, as well as the lighting lamp and the camera are all electrically connected to the controller. ; 2. The automatic detection device for crankshaft surface defects according to claim 1 is characterized in that: The conveying chain is a chain plate and chain shaft structure, wherein the chain plate includes a flat chain plate and an L-shaped chain plate; one side of the L-shaped chain plate is provided with a linking hole, and the other side is provided with a through hole for installing a V-shaped seat; during assembly, the flat chain plate and the L-shaped chain plate are alternately linked to the chain shaft in pairs.

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