A line edge inspection tool for inspecting the symmetry of the bayonet of a bearing cover and an inspection method thereof

Abstract

The present invention discloses a line edge inspection tool for inspecting the symmetry of the bayonet of a bearing cover, comprising a fixing plate, an inspection mechanism and a pushing structure, wherein the inspection mechanism comprises a cross bar, a support rod, a first threaded sleeve, a support plate, an inspection seat, a dial indicator fixing rod, a dial indicator and a second motor, and a semicircular reference block is provided on the top surface of the fixing plate, and an arc piece is provided on the arc surface of the semicircular reference block. The present invention has a compact structure and a small footprint; the manufacturing cost is low, and the cost expenditure of the enterprise is reduced while ensuring that the inspection work can be carried out in an orderly manner; the structure of the inspection seat effectively prevents the operator from accidentally touching or hitting the inspection head, has the function of protecting the inspection tool, ensures the inspection accuracy, and prolongs the service life of the inspection tool components; the present invention has accurate positioning and precise inspection, and can adjust the positioning reference according to different types of bearing covers, is convenient for positioning, and improves the efficiency of the inspection work.

Description

[Technical field]

[0001] The invention belongs to the technical field of engine parts detection, and in particular relates to a line edge detection fixture for detecting the symmetry of a bearing cover bayonet and a detection method thereof. [Background technology]

[0002] The seventh gear bearing cover snap-in of the cylinder block of some engine models needs to be installed with the oil pump assembly (including the oil pump bracket, oil pump and other components). Therefore, the symmetry accuracy of the snap-in is extremely high. If it exceeds the tolerance, it will affect the assembly performance of the engine oil pump assembly.

[0003] At present, the detection method for the bearing cover bayonet is to use a three-coordinate measuring machine for detection. Since the equipment is large in size, expensive, and easily damaged by collision, it is usually deployed on the production line at a frequency of 1 unit / shift. Therefore, in the detection of the symmetry of the bearing cover, the benchmark must often be re-determined, and the detection efficiency is low; if the detection head is damaged during use, it will not only affect the work but also make maintenance relatively difficult; the three-coordinate measuring machine needs to be sent for inspection after a certain period of use. When sending it for inspection, the equipment needs to be cleaned, hoisted, and transported back and forth, which has a large workload. In addition, due to its high price, purchasing a three-coordinate measuring machine as a backup will obviously increase the company's costs. At present, there is no convenient and low-cost inspection fixture for detecting the symmetry of the bearing cover bayonet. Therefore, the present application proposes a line edge inspection fixture for detecting the symmetry of the bearing cover bayonet and a detection method thereof to solve the above-mentioned problems. [Summary of the invention]

[0004] The purpose of the present invention is to provide a line edge inspection fixture and an inspection method for inspecting the symmetry of the bearing cover bayonet, so as to solve the problems of the existing three-coordinate inspection machine, such as large size, high price, easy damage; low inspection efficiency, inconvenient maintenance; large inspection workload, etc.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A line edge inspection tool for detecting the symmetry of the bearing cover bayonet, comprising a fixing plate and a detection mechanism, wherein a rectangular cavity is provided at the bottom of the fixing plate, a coaxial through hole is provided at the left end face and the right end face of the fixing plate respectively, a first screw rod is provided in the two through holes, a first motor is provided at the left end of the fixing plate, a rotating shaft of the first motor is connected to the left end of the first screw rod, a baffle is provided at the right end face of the fixing plate, a baffle through hole is provided at the right end face of the baffle, the right end of the first screw rod is extended from the baffle through hole of the baffle plate The front end face and the rear end face of the baffle are respectively provided with a travel groove, and a detection mechanism is arranged in the travel groove, and the detection mechanism comprises a cross bar, a support rod, a first threaded sleeve, a support plate, a detection seat, a dial indicator fixing rod, a dial indicator and a second motor, a support rod is arranged on the top surface of the cross bar, a threaded through hole is arranged on the end surface of the cross bar, a first threaded sleeve is arranged at the threaded through hole on the left end surface of the cross bar, the cross bar is sleeved on the first screw rod through its own threaded through hole and the first threaded sleeve, and a The cam is provided with a plurality of connecting rods, each of which has a plurality of connecting rods, each of which has a plurality of connecting rods, each of which has a plurality of connecting rods, each of which has a plurality of connecting rods, each of which has a plurality of connecting rods.

[0007] Furthermore, the front end surface and the rear end surface of the cross bar are respectively provided with bosses, and the bosses are respectively placed in the travel grooves of the two short baffles.

[0008] Furthermore, the support rod and the support plate are connected by bolts, and a convex-shaped notch is provided on the left end face of the support plate, so that two opposite L-shaped ribs are formed on the left side of the support plate, and lifting grooves are respectively provided on the front end face and the rear end face of the detection seat, and the detection seat is mounted on the L-shaped rib of the support plate through its own two lifting grooves.

[0009] Furthermore, the front end surfaces of the two L-shaped ribs are respectively provided with a threaded through hole, and a detection seat fixing screw is arranged in the threaded through hole.

[0010] Furthermore, a dial indicator protection groove is provided on the left end face of the detection seat, a right-angle opening is provided on the top face of the detection seat, the sleeve is arranged at a right angle of the right-angle opening, the dial indicator protection groove divides the sleeve into two sections, the dial indicator fixing rod is composed of a fixing sleeve, a pin and a screw, two pins are symmetrically provided on the side face of the fixing sleeve, the two pins are correspondingly arranged in the two sections of the sleeve, a threaded through hole is provided on the top of the fixing sleeve, a screw is provided in the threaded through hole of the fixing sleeve, a dial indicator is provided in the fixing sleeve, and the second motor is fixed to the front end face or the rear end face of the detection seat and the rotating shaft of the second motor is connected to one end of the pin.

[0011] Furthermore, a third motor is provided on the front end surface or the rear end surface of the fixing plate, and a rotating shaft of the third motor is connected to one end of the second screw rod.

[0012] Furthermore, a switch and an operation display screen are provided on the top surface of the left middle part of the fixed plate, and a controller is provided at the bottom of the fixed plate, and the controller is connected to the first motor, the second motor, the third motor, the dial indicator, the switch and the operation display screen.

[0013] Furthermore, a semicircular long groove is provided on the arc surface of the semicircular reference block, a semicircular long side corresponding to the semicircular long groove is provided on the bottom surface of the arc piece, a semicircular long groove is also provided on the top surface of the arc piece, and one end of the semicircular long groove of the semicircular reference block and the arc piece is closed.

[0014] Furthermore, the dial indicator is a digital dial indicator.

[0015] A method for detecting the symmetry of a bearing cover bayonet by using a line edge inspection tool, characterized in that it comprises the following steps:

[0016] Step 1: Turn on the switch to start the controller, reset and clear the operations and parameters on the operation display, and then move the detection mechanism to the end point of the right end of the first screw rod;

[0017] Step 2: Fix the semicircular reference block, increase or decrease the installation of the arc piece according to the size of the bearing cover to be tested, and install the bearing cover on the top surface of the fixing plate on both sides of the semicircular reference block or the arc piece, so that the arc surface at the bottom of the bearing cover fits with the top arc surface of the semicircular reference block or the arc piece to form a limit;

[0018] Step 3: Drive the second motor to rotate clockwise, turn the pin of the dial gauge placed in the dial gauge protection groove from a vertical state to a horizontal state, and the first motor drives the first screw to rotate, so that the detection mechanism moves toward the right end surface of the bearing cover. When the detection head of the dial gauge touches the right end surface of the bearing cover, the controller receives a signal and issues a command to stop the detection mechanism from moving;

[0019] Step 4: operate the operation display screen to reset the reading of the dial indicator to zero, and then issue a command to the controller through the operation display screen. The controller starts the third motor to make the propulsion structure move longitudinally, and pushes the bearing cover to move longitudinally. The dial indicator detects the symmetry of the bayonet on the right end face of the bearing cover. The measured parameters are displayed in real time on the operation display screen. After the end face is detected, the bearing cover and the dial indicator are separated. After 5 seconds, the controller detects that the dial indicator parameter reading is continuously zero, and starts to calculate the maximum deviation value;

[0020] Step 5: After checking the symmetry of the bayonet on the right end face, rotate the bearing cover 180° and check the symmetry of the bayonet on the left end face of the bearing cover. The checking steps are the same as step 4. After checking the end face, separate the bearing cover and the dial indicator. After 5 seconds, the controller checks that the dial indicator parameter reading is continuously zero and starts to calculate the maximum deviation value.

[0021] Step 6: Evaluate the results. When the absolute value of the maximum deviation of the snap-in at both ends of the bearing cover meets the technical requirements, it is qualified, otherwise it is unqualified.

[0022] The beneficial effects achieved by the present invention are:

[0023] The inspection fixture has a compact structure, and multiple units can be set up beside the production line without occupying a large area; the parts of the inspection fixture are all mature product parts in the existing market, and the price is low, so it is suitable for assembling multiple units for backup, reducing the company's cost expenditure while ensuring that the inspection work can be carried out in an orderly manner; when the inspection fixture is not in use, the dial indicator can be rotated and stored in the dial indicator protection slot of the inspection seat to prevent the operator from accidentally touching or hitting the inspection head. It has the function of protecting the inspection tool, ensuring the inspection accuracy and extending the service life of the inspection fixture parts; the inspection fixture has accurate positioning and precise inspection, and the positioning reference can be adjusted according to different types of bearing covers, which is convenient for positioning and improves the efficiency of inspection work; it is easy to maintain, and the inspection fixture can be directly transferred to a place not far from the production line to replace and debug related parts, and the inspection load is small.

Brief Description of the Drawings

[0024] In the attached picture:

[0025] Figure 1 It is a first stereoscopic schematic diagram of the present invention;

[0026] Figure 2 is a second stereoscopic schematic diagram of the present invention;

[0027] Figure 3 It is a front view of the present invention;

[0028] Figure 4 A bottom view of the present invention;

[0029] Figure 5 An exploded view of the detection mechanism of the present invention;

[0030] Figure 6 is a top view of the support plate of the present invention;

[0031] Figure 7 It is a three-dimensional schematic diagram of the detection seat of the present invention;

[0032] Figure 8 It is a three-dimensional schematic diagram of the propulsion structure of the present invention;

[0033] Fig. 9 It is an explosion picture of the semicircular reference block and the arc piece of the present invention.

[0034] Figure numerals: 1, fixing plate; 2, switch; 3, operation display screen; 4, bearing cover; 5, second motor; 6, detection seat; 6-1, dial indicator protection groove; 6-2, shaft sleeve; 6-3, lifting groove; 7, dial indicator; 8, support plate; 8-1, L-shaped rib; 9, support rod; 10, long baffle; 11, short baffle; 12, semicircular reference block; 13, second screw rod; 14, nut; 15, arc piece; 15-1, Long side of the semicircle; 16, driving structure; 16-1, second shaft sleeve; 16-2, connecting arm; 16-3, slider; 16-4, slider fixing screw; 17, first motor; 18, cross bar; 18-1, bump; 18-2, first threaded sleeve; 19, second motor; 20, first screw rod; 21, controller; 22, pin shaft; 23, screw; 24, fixing sleeve; 25, detection seat fixing screw; 26, semicircular long groove. [Specific implementation method]

[0035] The following is a detailed description with reference to specific embodiments.

[0036] The present invention will be further described in detail below in conjunction with specific embodiments. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope of the present invention and its application.

[0037] like Figure 1-9As shown, a line edge inspection fixture for detecting the symmetry of the bearing cover bayonet includes a fixing plate 1 and a detection mechanism. A rectangular cavity is provided at the bottom of the fixing plate 1. A coaxial through hole is provided at the left end face and the right end face of the fixing plate 1 respectively. A first screw rod 20 is provided in the two through holes. A first motor 17 is provided at the left end of the fixing plate 1. The rotating shaft of the first motor 17 is connected to the left end of the first screw rod 20. A baffle is provided at the right end face of the fixing plate 1. The baffle consists of a long baffle 10 and a short baffle 11. They are connected by bolts. The left end face of the long baffle 10 is provided with two short baffles 11. The left end faces of the two short baffles 11 and the right end face of the fixing plate 1 The two surfaces are connected, and a baffle through hole is opened on the right end surface of the long baffle 10, wherein a travel through groove is opened on the front end surface of one short baffle 11 and the rear end surface of the other short baffle 11 respectively, and the right end of the first screw rod 20 passes through the baffle through hole of the baffle, and a nut 14 is arranged on the right end of the first screw rod 20, and a detection mechanism is arranged in the travel through groove, and the detection mechanism includes a cross bar 18, a support rod 9, a first threaded sleeve 18-2, a support plate 8, a detection seat 6, a dial indicator fixing rod, a dial indicator 7 and a second motor 5, and a boss 18-1 is respectively arranged on the front end surface and the rear end surface of the cross bar 18, and the boss 18-1 is respectively placed in the travel through grooves of the two short baffles 11;A support rod 9 is provided in the middle of the top surface of the cross bar 18, a threaded through hole is provided in the middle of the left end surface of the cross bar 18, a first threaded sleeve 18-2 is provided at the threaded through hole on the left end surface of the cross bar 18, the cross bar 18 is sleeved on the first screw rod 20 through its own threaded through hole and the first threaded sleeve 18-2, a support plate 8 is provided on the top of the support rod 9, a plurality of bolt countersunk holes are provided on the top surface of the support rod 9, a plurality of bolt through holes corresponding to the bolt countersunk holes are provided on the support plate 8, bolts are provided in the bolt countersunk holes and the bolt through holes, the support rod 9 and the support plate 8 are connected by bolts, and a convex-shaped opening is provided on the left end surface of the support plate 8 The left side of the support plate 8 is provided with two L-shaped ribs 8-1 facing each other front and back, and a detection seat 6 is provided on the support plate 8. The front end surface and the rear end surface of the detection seat 6 are respectively provided with lifting grooves 6-3. The detection seat 6 is sleeved on the L-shaped rib 8-1 of the support plate 8 through its two lifting grooves 6-3. The front end surfaces of the two L-shaped ribs 8-1 are respectively provided with a threaded through hole, and a detection seat fixing screw 25 is provided in the threaded through hole. When the height of the detection seat 6 needs to be adjusted, the detection seat fixing screw 25 is first loosened to adjust the height of the detection seat 6, and then the detection seat fixing screw 25 is tightened to complete the adjustment. The paired detection seats 6 are fixed, the left end face of the detection seat 6 is provided with a dial indicator protection groove 6-1, the detection seat 6 is provided with a second motor 5, the top of the detection seat 6 is provided with a shaft sleeve 6-2, the top face of the detection seat 6 is provided with a right angle opening to the right, the shaft sleeve 6-2 is arranged at a right angle to the right angle opening, the dial indicator protection groove 6-1 divides the shaft sleeve 6-2 into two sections, a dial indicator fixing rod is arranged in the shaft sleeve 6-2, and a dial indicator 7 is arranged on the dial indicator fixing rod, wherein the dial indicator fixing rod is composed of a fixing sleeve 23, a pin shaft 22 and a screw 24, two pin shafts 22 are symmetrically arranged on the side of the fixing sleeve 23, and the two pin shafts 24 are symmetrically arranged on the side of the fixing sleeve 23. The shaft 22 is correspondingly arranged in the two-section shaft sleeve 6-2, the top of the fixed sleeve 23 is provided with a threaded through hole, the threaded through hole of the fixed sleeve 23 is provided with a screw 24, and the fixed sleeve 23 is provided with a dial indicator 7. The second motor 19 is fixed to the front end face or the rear end face of the detection seat 6 and the rotating shaft of the second motor 19 is connected to one end of the pin shaft 22. A nut 14 is welded to the end of the other section of the pin shaft 22 on the fixed sleeve 23. When the inspection tool is not in use, the detection head of the dial indicator 7 can be placed in the dial indicator protection groove 6-1. The dial indicator 7 is a digital display dial indicator purchased on the market, such as a capacitive grid digital display dial indicator. ;

[0038] A coaxial through hole is respectively provided on the front end face and the rear end face of the fixing plate 1, and a second screw rod 13 is provided in the coaxial through hole of the front end face and the rear end face of the fixing plate 1. A third motor 19 is provided on the front end face or the rear end face of the fixing plate 1, and the rotating shaft of the third motor 19 is connected to one end of the second screw rod 13. A nut 14 is provided on the end of the second screw rod 13 away from the third motor 19. A pushing structure 16 is provided on the second screw rod 13, and the pushing structure consists of a second threaded sleeve 16-1, a connecting arm 16-2, a slider 16-3 and a slider fixing screw 16-4. Two connecting arms 16-2 are symmetrically provided on the side wall of the second threaded sleeve 16-1. Two symmetrical longitudinally distributed rectangular through grooves are provided on the top surface of the fixing plate 1. The ends of the two connecting arms 16-2 are bent upward and extend out from the two through grooves. A through hole is provided on the side wall at the end of the connecting arm 16-2, and a slider 16-3 is provided in the through hole. The top surface of the connecting arm 16-2 A threaded through hole is provided, and a slider fixing screw 16-4 is provided in the threaded through hole. The function of the slider 16-3 is that when the bearing cover 4 to be detected is small in size and the end face of the end of the connecting arm 16-2 is not sufficient to completely contact the end face of the bearing cover 4, the slider 16-4 can be adjusted left and right to make the slider 16-4 contact the end face of the bearing cover 4, thereby increasing the contact area, ensuring that the bearing cover 4 will not swing when the bearing cover 4 is pushed, and ensuring the correctness of the detection parameters. A semicircular reference block 12 is provided on the top surface between the two longitudinal rectangular through grooves of the fixed plate 1, and an arc piece 15 is provided on the arc surface at the top of the semicircular reference block 12. A semicircular long groove 26 is provided on the arc surface at the top of the semicircular reference block 12, and a semicircular long side 15-1 corresponding to the semicircular long groove 26 is provided on the bottom surface of the arc piece 15, and a semicircular long groove 26 is also provided on the top surface of the arc piece 15, and one end of the semicircular long groove 26 of the semicircular reference block 12 and the arc piece 15 is closed.

[0039] A switch 2 and an operation display screen 3 are provided on the top surface of the middle left side of the fixed plate 1, and a controller 21 is provided at the bottom of the fixed plate 1. The controller 21 is connected to the first motor 17, the second motor 5, the third motor 19, the dial indicator 7, the switch 2 and the operation display screen 3.

[0040] The present invention also provides a method for detecting a line edge inspection tool for detecting the symmetry of a bearing cover bayonet, comprising the following steps:

[0041] First, turn on the switch 2 of the inspection tool, start the controller 21 to wake up the operation display screen 3, reset and clear the operations and parameters on the operation display screen 3, and then control the first motor 17 to rotate to move the detection mechanism to the end of the right end of the first screw rod 20, and limit it by the baffle; fix the semicircular reference block 12, increase or decrease the installation of the arc piece 15 according to the size of the bearing cover 4 to be detected, and the arc piece 15 is stuck on the semicircular reference block 12 through the long side 15-1 of the arc, which can ensure that the arc piece 15 does not move; install the bearing cover 4 on the top of the fixed plate 1 on both sides of the semicircular reference block 12 or the arc piece 15 The first motor 17 drives the first screw rod 20 to rotate, so that the detection mechanism moves toward the right end face of the bearing cover 4. When the detection head of the dial indicator 7 touches the right end face of the bearing cover 4, the controller 21 receives a signal and issues a command to stop the detection mechanism from moving. The operation display screen 3 is controlled to turn the reading of the dial indicator 7 to the horizontal state. The number is reset to zero, and the controller 21 is given an instruction through the operation display screen 3. The controller 21 starts the third motor 19 to make the pushing structure 16 move longitudinally, pushing the bearing cover 4 to move longitudinally, and the dial indicator 7 detects the symmetry of the bayonet on the right end face of the bearing cover 4. The measured parameters are displayed in real time on the operation display screen 3. After the end face is detected, the bearing cover 4 and the dial indicator 7 are separated. The controller 21 detects that the parameter reading of the dial indicator 7 is continuously zero after the set number of seconds, such as 5 seconds, and then enters the calculation process and starts to calculate the maximum deviation value. The calculation of the maximum deviation value is the maximum positive value of the benchmark (the benchmark is set to 0 bit value) The negative maximum value of the value + the benchmark (the benchmark is set to the 0 value); after detecting the symmetry of the bayonet at the right end face of the bearing cover 4, the bearing cover 4 is rotated 180°, and the symmetry of the bayonet at the left end face of the bearing cover 4 is detected. The detection steps are the same as those mentioned above. After detecting the end face, the bearing cover 4 and the dial indicator 7 are separated. The controller detects that the parameter reading of the dial indicator 7 is continuously zero after the set number of seconds, such as 5 seconds, and starts to calculate the maximum deviation value; after the detection is completed, the results are evaluated. When the absolute value of the maximum deviation value of the bayonet at both ends of the bearing cover 4 is within the deviation range of the technical requirements, it is qualified, otherwise it is unqualified.

[0042] The present invention has a compact structure, and multiple units can be set up beside the production line without occupying a large area; and the components of the present invention are all mature product components in the existing market and are low in price, so it is suitable for assembling multiple units for backup, reducing the company's cost expenditure while ensuring that the detection work can be carried out in an orderly manner; when the present invention is not in use, the dial indicator can be electrically controlled and rotated to be stored in the dial indicator protection groove of the detection seat to prevent the operator from accidentally touching or hitting the detection head, and it has the function of protecting the detection tool, ensuring the detection accuracy and extending the service life of the inspection tool components; the present invention has accurate positioning and precise detection, and the positioning reference can be adjusted according to different types of bearing covers, which is convenient for positioning and improves the efficiency of the detection work; it is easy to maintain, and the present invention can be directly transferred to a location not far from the production line to replace and debug related components, and the inspection load is small.

Claims

1. A line edge inspection tool for detecting the symmetry of the bearing cover bayonet, characterized in that: The motor is equipped with a first threaded sleeve, and the second threaded sleeve has a first end portion which is provided with a threaded hole, and the second threaded sleeve has a first end portion which is provided with a second threaded hole. The plate is provided with a detection seat, the detection seat is provided with a second motor, the top of the detection seat is provided with a shaft sleeve, a dial indicator fixing rod is provided in the shaft sleeve, and a dial indicator is provided on the dial indicator fixing rod, the front end face and the rear end face of the fixing plate are respectively provided with a coaxial through hole, a second screw rod is provided in the coaxial through hole of the front end face and the rear end face of the fixing plate, a pushing structure is provided on the second screw rod, and the pushing structure consists of a second threaded sleeve, a connecting arm, a slider and a slider fixing screw, two connecting arms are symmetrically provided on the side wall of the second threaded sleeve, the top surface of the fixing plate is provided with two longitudinally distributed rectangular through grooves, the ends of the two connecting arms are bent upward and extend out from the two through grooves, a through hole is provided on the side wall of the end of the connecting arm, a slider is provided in the through hole, a threaded through hole is provided on the top surface of the connecting arm, a slider fixing screw is provided in the threaded through hole, a semicircular reference block is provided on the top surface between the two longitudinal rectangular through grooves of the fixing plate, and an arc piece is provided on the arc surface of the semicircular reference block.

2. A line edge inspection tool for detecting the symmetry of the bearing cover bayonet according to claim 1, characterized in that: The front end surface and the rear end surface of the cross bar are respectively provided with bosses, and the bosses are respectively placed in the travel through grooves of the two short baffles.

3. A line edge inspection tool for detecting the symmetry of the bearing cover bayonet according to claim 1, characterized in that: The support rod and the support plate are connected by bolts, and a convex-shaped notch is provided on the left end face of the support plate, so that two opposite L-shaped ribs are formed on the left side of the support plate, and lifting grooves are respectively provided on the front end face and the rear end face of the detection seat, and the detection seat is mounted on the L-shaped rib of the support plate through its own two lifting grooves.

4. A line edge inspection tool for detecting the symmetry of the bearing cover bayonet according to claim 3, characterized in that: A threaded through hole is respectively formed on the front end surface of the two L-shaped ribs, and a detection seat fixing screw is arranged in the threaded through hole.

5. A line edge inspection tool for detecting the symmetry of the bearing cover bayonet according to claim 1, characterized in that: A dial indicator protection groove is provided on the left end face of the detection seat, a right-angle opening is provided on the top face of the detection seat, the sleeve is arranged at a right angle of the right-angle opening, the dial indicator protection groove divides the sleeve into two sections, the dial indicator fixing rod is composed of a fixing sleeve, a pin and a screw, two pins are symmetrically provided on the side face of the fixing sleeve, the two pins are correspondingly arranged in the two sections of the sleeve, a threaded through hole is provided on the top of the fixing sleeve, a screw is provided in the threaded through hole of the fixing sleeve, a dial indicator is provided in the fixing sleeve, the second motor is fixed to the front end face or the rear end face of the detection seat and the rotating shaft of the second motor is connected to one end of the pin.

6. A line edge inspection tool for detecting the symmetry of the bearing cover bayonet according to claim 1, characterized in that: A third motor is disposed on the front end surface or the rear end surface of the fixing plate, and a rotating shaft of the third motor is connected to one end of the second screw rod.

7. A line edge inspection tool for detecting the symmetry of the bearing cover bayonet according to claim 6, characterized in that: A switch and an operation display screen are arranged on the top surface of the left middle part of the fixed plate, and a controller is arranged at the bottom of the fixed plate. The controller is connected to the first motor, the second motor, the third motor, the dial indicator, the switch and the operation display screen.

8. The line edge inspection tool for detecting the symmetry of the bearing cover bayonet according to claim 1, characterized in that: A semicircular long groove is provided on the arc surface of the semicircular reference block, a semicircular long side corresponding to the semicircular long groove is provided on the bottom surface of the arc piece, a semicircular long groove is also provided on the top surface of the arc piece, and one end of the semicircular long groove of the semicircular reference block and the arc piece is closed.

9. A line edge inspection tool for detecting the symmetry of the bearing cover bayonet according to claim 1, characterized in that: The dial indicator is a digital dial indicator.

10. A method for detecting a line edge inspection fixture for detecting the symmetry of a bearing cap bayonet according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Turn on the switch to start the controller, reset and clear the operations and parameters on the operation display, and then move the detection mechanism to the end point of the right end of the first screw rod; Step 2: Fix the semicircular reference block, increase or decrease the installation of the arc piece according to the size of the bearing cover to be tested, and install the bearing cover on the top surface of the fixing plate on both sides of the semicircular reference block or the arc piece, so that the arc surface at the bottom of the bearing cover fits with the top arc surface of the semicircular reference block or the arc piece to form a limit; Step 3: Drive the second motor to rotate clockwise, turn the pin of the dial gauge placed in the dial gauge protection groove from a vertical state to a horizontal state, and the first motor drives the first screw to rotate, so that the detection mechanism moves toward the right end surface of the bearing cover. When the detection head of the dial gauge touches the right end surface of the bearing cover, the controller receives a signal and issues a command to stop the detection mechanism from moving; Step 4: operate the operation display screen to reset the reading of the dial indicator to zero, and then issue a command to the controller through the operation display screen. The controller starts the third motor to make the propulsion structure move longitudinally, and pushes the bearing cover to move longitudinally. The dial indicator detects the symmetry of the bayonet on the right end face of the bearing cover. The measured parameters are displayed in real time on the operation display screen. After the end face is detected, the bearing cover and the dial indicator are separated. After 5 seconds, the controller detects that the dial indicator parameter reading is continuously zero, and starts to calculate the maximum deviation value; Step 5: After checking the symmetry of the bayonet on the right end face, rotate the bearing cover 180° and check the symmetry of the bayonet on the left end face of the bearing cover. The checking steps are the same as step 4. After checking the end face, separate the bearing cover and the dial indicator. After 5 seconds, the controller checks that the dial indicator parameter reading is continuously zero and starts to calculate the maximum deviation value. Step 6: Evaluate the results. When the absolute value of the maximum deviation of the snap-in at both ends of the bearing cover meets the technical requirements, it is qualified, otherwise it is unqualified.

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