Battery box lower shell detection tool and use method thereof

Abstract

The invention discloses a battery box lower shell inspection tool and a use method thereof, and relates to the field of automobile part inspection jigs, and the key point of the technical scheme is that the battery box lower shell inspection tool comprises an operation table, an inspection pin, a thread gauge, a go-no go gauge, an aperture gauge, a long cross beam detachable inspection block, a short cross beam detachable inspection block, a plurality of movable blocks and a plurality of handheld inspection blocks. Light can be projected on the imaging plate through the light source, the light can penetrate through a hole formed in the upper side direction of the lower shell of the battery box, a light spot is projected on the imaging plate, the camera shooting assembly can shoot shadow images on the imaging plate at a proper position, the shadow images are compared with preset standard images through the computer, and the image quality is improved. The positions and the sizes of the light spots on the shadow imaging of the imaging plate can be compared through the computer, so that whether the hole laterally formed in the lower shell of the battery box is qualified or not is judged, and the detection work of the lower shell of the battery box can be greatly accelerated.

Description

Technical Field

[0001] The invention relates to the field of automobile parts inspection jigs, and more specifically, to a battery box lower shell inspection jig and a use method thereof. Background Art

[0002] With the rapid development of the electric vehicle industry, the safety of power battery packs, as core components of automobiles, is gradually becoming apparent and directly affecting the safety and stability of the entire vehicle. The automobile battery box is fixed on the vehicle body and is used to place multiple battery packs. The automobile battery box includes a lower shell and an upper shell. The lower shell is installed on the vehicle body through multiple sets of locking bolts, and the upper shell plays a protective role. Since automobiles belong to the precision manufacturing industry, the production accuracy of the automobile battery box determines the subsequent assembly and the service life of the automobile battery box. However, the detection of automobile battery boxes currently mainly relies on three-dimensional coordinates, but the installation holes of automobile battery boxes are difficult to detect using three-dimensional coordinates. In addition, three-dimensional coordinate detection is time-consuming and labor-intensive, and the detection efficiency is low.

[0003] A Chinese patent with publication number CN214276716U discloses an automobile battery box assembly and inspection jig, which includes an operating table, a lower box body positioning mechanism and an upper shell body positioning mechanism. The positioning column is used to preliminarily lock the lower box body, and multiple sets of positioning clamps can quickly position and lock the lower box body, and the pin of the detection pin assembly can quickly detect the detection hole of the lower box body, and then determine whether the reserved holes and detection holes of the lower box body meet the design requirements; the pre-positioning rod passes through the lower box body and the upper shell body, thereby realizing the preliminary positioning of the upper shell body, and then the lock is used to stably lock the upper shell body on the lower box body, thereby realizing the assembly and inspection of the automobile battery box.

[0004] The four sides of the lower shell of the battery box are provided with a large number of holes, and it is inefficient to detect the pins of the detection pin assembly one by one.

[0005] Therefore, a new solution needs to be proposed to solve this problem. Summary of the invention

[0006] In view of the deficiencies in the prior art, an object of the present invention is to provide a battery box lower shell inspection fixture and a method of using the same.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: a battery box lower shell inspection tool, including an operating table, an inspection pin, a thread gauge, a go / no-go gauge, an aperture gauge, a long crossbeam detachable inspection block, a short crossbeam detachable inspection block, a plurality of movable blocks and a plurality of handheld inspection blocks, the operating table is provided with a reference seat for sticking to the side of the product and a clamp for clamping the product, the inspection pin and the movable block are detachably connected, the movable block and the long crossbeam detachable inspection block or the short crossbeam detachable inspection block are detachably connected, the long crossbeam detachable inspection block or the short crossbeam detachable inspection block is detachably connected to the operating table and drives a plurality of The detection pins on the movable block detect the hole positions of the product, the thread gauge is used to check and determine whether the size of the thread on the product is qualified, the go / no-go gauge and the aperture gauge are used to check and determine whether the size of the hole on the product is qualified, the handheld detection block is provided with a number of plugs that are inserted into the holes on the product, the long beam detachable detection block and the short beam detachable detection block can be detachably connected with a light source and a camera assembly, the side of the operating table is detachably connected with a vertically arranged imaging board, the camera assembly is used to capture the projection on the imaging board and compare it with the standard imaging through a computer to check and determine whether the position and aperture of the hole on the product are qualified.

[0008] The present invention is further configured such that the position of the movable block on the long crossbeam detachable detection block or the short crossbeam detachable detection block is adjustable.

[0009] The present invention is further configured such that the positions of the light source and the camera assembly on the long beam detachable detection block or the short beam detachable detection block are adjustable.

[0010] The present invention is further configured as follows: a laser component is detachably connected to the detachable detection block of the long beam and the detachable detection block of the short beam, and the laser emitted by the laser component passes through the hole on the product and irradiates the imaging plate to assist computer image comparison.

[0011] The present invention is further configured such that the position of the laser assembly on the long beam detachable detection block or the short beam detachable detection block is adjustable.

[0012] The present invention is further configured as follows: the operating table includes a movable frame, the movable frame includes a pulley base and a separate table top, the reference seat and the pressure clamp are located on the separate table top, and the separate table top can rotate in the horizontal direction.

[0013] The present invention is further configured as follows: the operating table also includes a lifting and rotating member, the lifting and rotating member is arranged on the ground, a magnetic block is provided at the top of the lifting and rotating member, and a magnet for adsorbing the magnetic block is provided on the bottom surface of the separate table top, and the lifting and rotating member is used to drive the magnetic block to lift and rotate ninety degrees in the horizontal direction. When the magnetic block rises to the highest point, the magnetic block and the magnet adsorb and lift up the separate table top, and then the lifting and rotating member drives the magnetic block and the separate table top to rotate ninety degrees.

[0014] The present invention is further configured as follows: the operating table also includes a guide rail base, the lifting and rotating member is located in the center of the guide rail base, a plurality of wheels are provided on the bottom surface of the pulley base, and a plurality of slide rails for clamping the wheels are provided on the guide rail base.

[0015] The present invention is further configured as follows: the light source, the camera assembly and the laser assembly are all fixedly connected with a pan-tilt head, and the pan-tilt head and the long beam detachable detection block or the short beam detachable detection block are detachably connected.

[0016] A method for using a battery box lower shell inspection fixture comprises the following steps: S1: Place the lower shell of the battery box as a product on the operating table; S2: Use the reference seat to position the product and further fix the product with the clamp; S3: fix multiple detection pins on the movable block, fix multiple movable blocks to the long beam detachable detection block, fix multiple movable blocks to the short beam detachable detection block in the same steps, and also fix the light source and the camera assembly to the long beam detachable detection block and the short beam detachable detection block; S4: Fix the long beam detachable detection block and the short beam detachable detection block on the operating table from top to bottom. The long beam detachable detection block and the short beam detachable detection block are located above the product. The movable block drives multiple detection pins to detect the upward holes of the product. S5: Install a fixed imaging plate on the side of the operating table; S6: Start the light source to illuminate the holes on the side of the product and project a shadow image on the imaging board; S7: The camera assembly takes a picture of the shadow image projected on the imaging plate and transmits it to the computer; S8: Compare the shadow image on the imaging plate with the standard image through a computer and determine whether the position and diameter of the holes on the product are qualified. If the judgment result is qualified, there is no need to detect the position and diameter of these holes. If the judgment result is unqualified, manual re-inspection is performed using a go / no-go gauge, an aperture gauge, and a handheld inspection block to eliminate computer misjudgment; S9: dismantle the long beam detachable detection block and the short beam detachable detection block; S10: Manually inspect the remaining holes using thread gauges, go and no-go gauges, aperture gauges, and handheld inspection blocks.

[0017] In summary, the present invention has the following beneficial effects: the reference seat and the pressure clamp can be used to position the product, which is convenient for subsequent inspection. This process is extremely important and lays a good foundation for comparing the shadow imaging and the standard image on the subsequent imaging plate. The positions of the movable blocks and the inspection pins on the detachable inspection block with a long crossbeam and the detachable inspection block with a short crossbeam require accurate positioning of the product, which can greatly improve the inspection efficiency of the lower shell of the battery box. The inspection pins, thread gauges, go and no-go gauges, and aperture gauges can be used to perform all-round inspections on the holes on the product, and the inspection holes of the lower shell of the battery box can be quickly inspected, thereby determining whether the reserved holes and the inspection holes of the lower shell of the battery box meet the design requirements. Several plug posts are arranged on the handheld inspection block, which is equivalent to a constant distance between the several plug posts. The handheld inspection block can be used to simultaneously inspect the positions and apertures of several holes on the lower shell of the battery box, which can improve the inspection efficiency of the lower shell of the battery box. Multiple movable blocks can be installed on the detachable inspection block with a long crossbeam and the detachable inspection block with a short crossbeam. At the same time, several detection pins can be installed on multiple movable blocks, so that a long beam detachable detection block or a short beam detachable detection block can drive several detection pins to move, which is used to simultaneously detect multiple hole positions on the lower shell of the battery box, and the distance between the multiple detection pins on the movable block remains unchanged, so that the multiple detection pins can also detect the positions of the holes on the lower shell of the battery box; while the long beam detachable detection block or the short beam detachable detection block uses the detection pins to detect the holes on the lower shell of the battery box, the light source can use light to project on the imaging board, and the light can pass through the holes opened laterally on the lower shell of the battery box and project a light spot on the imaging board. The camera component can shoot the shadow imaging on the imaging board at the appropriate position, and compare it with the preset standard imaging through a computer. The position and size of the light spot on the shadow imaging of the imaging board can be compared by a computer, so as to determine whether the holes opened laterally on the lower shell of the battery box are qualified. This step can greatly speed up the inspection of the lower shell of the battery box. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the local structure of the first embodiment; Figure 2 for Figure 1 The enlarged schematic diagram of the middle A part; Figure 3 for Figure 1 The enlarged schematic diagram of the middle part B; Figure 4 for Figure 1 The enlarged schematic diagram of the middle C part; Figure 5 It is a structural schematic diagram of the handheld detection block in the first embodiment; Figure 6This is a schematic diagram of the structure of the detachable detection block, movable block and detection pin of the long crossbeam in the first embodiment; Figure 7 This is a schematic diagram of the structure of the detachable detection block of the long beam, the light source and the camera assembly in the first embodiment; Figure 8 It is a structural schematic diagram of the operating table and the imaging plate in the first embodiment; Fig. 9 This is a schematic diagram of the structure of the detachable detection block, light source, camera assembly and laser assembly of the long beam in the third embodiment; Fig.10 This is a schematic diagram of the structure of the detachable detection block of the long beam, the light source, the camera assembly, the laser assembly and the pan / tilt head in the fourth embodiment; Fig.11 It is a structural schematic diagram of the operating table in the fourth embodiment; Fig.12 It is a structural schematic diagram of the lifting and rotating part in the fourth embodiment.

[0019] In the figure: 1. operating table; 2. detection pin; 3. thread gauge; 4. go / no-go gauge; 5. aperture gauge; 6. detachable detection block with long crossbeam; 7. detachable detection block with short crossbeam; 8. movable block; 9. hand-held detection block; 10. plug-in column; 11. light source; 12. camera assembly; 13. imaging board; 14. laser assembly; 15. pulley base; 16. separate table top; 17. magnetic block; 18. platform; 19. cylinder; 20. motor; 21. magnet; 22. guide rail base; 23. wheels; 24. slide rail; 25. pan / tilt; 26. reference seat; 27. pressing clamp. DETAILED DESCRIPTION

[0020] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments. Embodiment 1

[0021] A battery box lower shell inspection fixture, such as Figure 1-5 As shown, it includes an operating table 1, an inspection pin 2, a thread gauge 3, a go / no-go gauge 4, a hole gauge 5, a long crossbeam detachable inspection block 6, a short crossbeam detachable inspection block 7, a number of movable blocks 8 and a number of handheld inspection blocks 9, wherein the size specifications of the inspection pin 2, the thread gauge 3, the go / no-go gauge 4 and the hole gauge 5 are selected according to the size of the inspection hole on the lower shell of the battery box to be inspected, and a fixed tooling for placing these tools is provided on the operating table 1 to facilitate standardized manual taking and placement, thereby making the product inspection process more standardized and reducing inspection errors.

[0022] like Figure 1 and Figure 2 As shown, the operating table 1 is provided with a reference seat 26 for sticking to the side of the product and a clamp 27 for clamping the product. The clamp 27 is a fixing tool commonly used in the mechanical field, so it is not described here in detail.

[0023] like Figure 6-8 As shown, the detection pin 2 and the movable block 8 are detachably connected, and the movable block 8 and the long beam detachable detection block 6 or the short beam detachable detection block 7 are detachably connected. The long beam detachable detection block 6 or the short beam detachable detection block 7 is detachably connected to the operating table 1 and drives the detection pins 2 on several movable blocks 8 to detect the hole positions of the product. The thread gauge 3 is used to check and determine whether the size of the thread on the product is qualified. The go / no-go gauge 4 and the aperture gauge 5 are used to check and determine whether the size of the hole on the product is qualified. The handheld detection block 9 is provided with several plug-in columns 10 that are inserted into the holes on the product. The long beam detachable detection block 6 and the short beam detachable detection block 7 are both detachably connected with a light source 11 and a camera assembly 12. The side of the operating table 1 is detachably connected with a vertically arranged imaging board 13. The disassembly and assembly method of the imaging board 13 can adopt a more efficient plug-in method. The camera assembly 12 is used to shoot the projection on the imaging board 13 and compare it with the standard imaging through a computer to check and determine whether the position and aperture of the hole on the product are qualified.

[0024] like Figure 1-5As shown, the reference seat 26 and the pressure clamp 27 can be used to position the product, which is convenient for subsequent inspection. This process is extremely important and lays a good foundation for comparing the shadow imaging and the standard image on the subsequent imaging plate 13. The positions of the movable block 8 and the detection pin 2 on the long beam detachable inspection block 6 and the short beam detachable inspection block 7 require accurate positioning of the product, which can greatly improve the inspection efficiency of the lower shell of the battery box; the detection pin 2, the thread gauge 3, the go / no-go gauge 4, and the aperture gauge 5 can be used to perform a full range of inspections on the holes on the product, and the inspection holes of the lower shell of the battery box can be quickly inspected, and then it can be determined whether the reserved holes and the inspection holes of the lower shell of the battery box meet the design requirements; several plug posts 10 are arranged on the handheld inspection block 9, which is equivalent to a constant distance between the several plug posts 10. The handheld inspection block 9 can be used to simultaneously detect the positions and apertures of several holes on the lower shell of the battery box, which can improve the inspection efficiency of the lower shell of the battery box; multiple movable blocks 8 can be installed on the long beam detachable inspection block 6 and the short beam detachable inspection block 7, and multiple movable blocks 8 can be installed on the long beam detachable inspection block 6 and the short beam detachable inspection block 7. 8 can be installed with several detection pins 2, so that a long beam detachable detection block 6 or a short beam detachable detection block 7 can drive several detection pins 2 to move, and is used to simultaneously detect multiple hole positions on the lower shell of the battery box, and the distance between multiple detection pins 2 on the movable block 8 remains unchanged, so that multiple detection pins 2 can also detect the position of the hole on the lower shell of the battery box; while the long beam detachable detection block 6 or the short beam detachable detection block 7 uses the detection pins 2 to detect the holes on the lower shell of the battery box, the light source 11 can use light to project on the imaging board 13, and the light can pass through the hole opened laterally on the lower shell of the battery box and project a light spot on the imaging board 13. The camera component 12 can shoot the shadow imaging on the imaging board 13 at an appropriate position, and compare it with the preset standard imaging through a computer. The position and size of the light spot on the shadow imaging of the imaging board 13 can be compared by a computer, so as to determine whether the hole opened laterally on the lower shell of the battery box is qualified. This step can greatly speed up the inspection work of the lower shell of the battery box. Embodiment 2

[0025] A method for using a battery box lower shell inspection tool, applicable to the battery box lower shell inspection tool of embodiment 1, comprises the following steps: S1: Place the lower shell of the battery box as a product on the operating table 1, which can be carried manually or by a robotic arm; S2: Use the reference seat 26 to position the product, and further fix the product by the clamp 27; S3: fix multiple detection pins 2 on the movable block 8, fix multiple movable blocks 8 on the long beam detachable detection block 6, fix multiple movable blocks 8 on the short beam detachable detection block 7 in the same steps, and also fix the light source 11 and the camera assembly 12 on the long beam detachable detection block 6 and the short beam detachable detection block 7; S4: Fix the long beam detachable detection block 6 and the short beam detachable detection block 7 to the operating table 1 from top to bottom, the long beam detachable detection block 6 and the short beam detachable detection block 7 are located above the product, and the movable block 8 drives multiple detection pins 2 to detect the upward holes of the product; S5: Installing and fixing the imaging plate 13 on the side of the operating table 1; S6: Start the light source 11 to illuminate the hole on the side of the product and project a shadow image on the imaging plate 13; S7: The camera assembly 12 captures the shadow image projected on the imaging plate 13 and transmits it to the computer; S8: Compare the shadow image on the imaging plate 13 with the standard image through a computer and determine whether the position and diameter of the holes on the product are qualified. If the judgment result is qualified, there is no need to detect the position and diameter of these holes. If the judgment result is unqualified, manual re-inspection is performed through the go / no-go gauge 4, the aperture gauge 5 and the handheld detection block 9 to eliminate the computer's misjudgment; S9: disassembling the long beam detachable detection block 6 and the short beam detachable detection block 7; S10: Manually inspect the remaining holes using the thread gauge 3, the go / no-go gauge 4, the aperture gauge 5 and the handheld inspection block 9.

[0026] In the operation process, the method of fixing multiple detection pins 2 with movable blocks 8 and fixing multiple movable blocks 8 with long crossbeam detachable detection blocks 6 or short crossbeam detachable detection blocks 7 greatly simplifies the detection process of the lower shell of the battery box and improves the detection efficiency. In the process of simultaneous detection of a large number of detection holes by the long crossbeam detachable detection block 6 and the short crossbeam detachable detection block 7, the light source 11, the imaging board 13, the camera assembly 12 and the computer are used for visual comparison, so as to quickly compare whether the size and position of the lateral holes of the lower shell of the battery box are qualified. This step can further improve the efficiency of product detection. Embodiment 3

[0027] A battery box lower shell inspection fixture, such as Fig. 9 As shown, what is different from the first embodiment is that a laser component 14 is detachably connected to the detachable detection block 6 of the long beam and the detachable detection block 7 of the short beam. The laser emitted by the laser component 14 passes through the hole on the product and shines on the imaging board 13 to assist computer image comparison. After the laser component 14 is set in position, the laser emitted by the laser component 14 can pass through the detection hole on the product or directly hit the imaging board 13, thereby forming a brighter point on the imaging board 13, so that the shadow imaging on the imaging board 13 has a reference system formed by the laser point position. When compared with the standard imaging by computer, the comparison result is more accurate and correct, which can improve the accuracy of detection.

[0028] Further, such as Fig. 9As shown, the position of the movable block 8 on the long beam detachable detection block 6 or the short beam detachable detection block 7 is adjustable, the position of the light source 11 and the camera assembly 12 on the long beam detachable detection block 6 or the short beam detachable detection block 7 is adjustable, and the position of the laser assembly 14 on the long beam detachable detection block 6 or the short beam detachable detection block 7 is adjustable. By adjusting the position of the movable block 8 on the long beam detachable detection block 6 and the short beam detachable detection block 7, the position of the detection pin 2 can be adjusted, and the long beam detachable detection block 6 and the short beam detachable detection block 7 can also be installed with different movable blocks 8, so that a long beam The position of the detection pin 2 on the detachable detection block 6 or the short crossbeam detachable detection block 7 is variable and can be adjusted according to the shape of the lower shell of the battery box to be detected. Similarly, the positions of the lateral holes of different battery box lower shells are different, and the sizes of the holes are also different. The positions of the light source 11 and the camera assembly 12 can be adjusted according to the different lower shells of the battery box, which can ensure the clarity of the projection on the imaging board 13. For standard imaging in the computer, it is only necessary to call up the image of the corresponding lower shell of the battery box. Similarly, the position of the laser assembly 14 is adjusted according to the model of the lower shell of the battery box to facilitate computer visual comparison and improve the accuracy of detection.

[0029] The specific adjustment method of the movable block 8, light source 11, camera assembly 12 and laser assembly 14 can be adjusted by adopting a multi-link support arm structure commonly used by technicians in this field, adjusting the pan-tilt head 25, or fixing with different brackets, etc. There are many structural methods that can be implemented, so they will not be repeated here.

[0030] In the method of using this embodiment, it is necessary to change the positions of the movable block 8, light source 11, camera assembly 12 and laser assembly 14 on the long beam detachable detection block 6, and change the positions of the movable block 8, light source 11, camera assembly 12 and laser assembly 14 on the short beam detachable detection block 7 according to the model of the lower shell of the battery box to be detected. Embodiment 4

[0031] A battery box lower shell inspection fixture, such as Figure 10-12 As shown, the difference from the first embodiment is that the operating table 1 includes a mobile frame, the mobile frame includes a pulley base 15 and a separate table top 16, the reference seat 26 and the pressure clamp 27 are located on the separate table top 16, the separate table top 16 can rotate in the horizontal direction, the pulley base 15 allows the mobile frame to be movable, and the movable inspection fixture can facilitate the lower shell of the battery box to enter the next process, wherein the separate table top 16 is designed to be horizontally rotated relative to the mobile frame, and the staff on both sides of the inspection fixture only need to rotate the separate table top 16 to detect the other two sides of the lower shell of the battery box, which can improve the inspection efficiency of the lower shell of the battery box.

[0032] Specifically, Figure 10-12As shown, the operating table 1 also includes a lifting and rotating member, which is arranged on the ground. A magnetic block 17 is provided at the top of the lifting and rotating member, and a magnet 21 for adsorbing the magnetic block 17 is provided on the bottom surface of the separate table 16. The lifting and rotating member is used to drive the magnetic block 17 to rise and fall and rotate ninety degrees in the horizontal direction. When the magnetic block 17 rises to a high point, the magnetic block 17 and the magnet 21 adsorb and lift the separate table 16, and then the lifting and rotating member drives the magnetic block 17 and the separate table 16 to rotate ninety degrees. The lifting and rotating member includes a platform 18 lifted by a cylinder 19 (it can also adopt a lifting structure commonly used in other mechanical fields), and a motor 20 is arranged on the platform 18. The magnetic block 17 is fixed at the end of the output shaft of the motor 20. The magnetic block 17 can be driven to rise and fall by the cylinder 19 for adsorption or separation with the magnet 21. The motor 20 can drive the magnetic block 17 to rotate, thereby driving the magnet 21 and the separate table 16 to rotate, and then the lower shell of the battery box can be rotated, so that the staff can replace the side of the lower shell of the battery box for detection.

[0033] like Figure 10-12 As shown, the operating table 1 also includes a guide rail base 22, the lifting and rotating part is located in the center of the guide rail base 22, a plurality of wheels 23 are provided on the bottom surface of the pulley base 15, and a plurality of slide rails 24 for clamping the wheels 23 are provided on the guide rail base 22. The wheels 23 slide into the guide rail base 22, so that the position of the magnet 21 under the separate table top 16 can be accurately located, so that when the lifting and rotating part is lifted, the magnetic block 17 can be adsorbed and fixed to the magnet 21, which is convenient for the subsequent rotation of the lower shell of the battery box.

[0034] like Figure 10-12 As shown, the light source 11, the camera assembly 12 and the laser assembly 14 are all fixedly connected with a pan-tilt head 25, and the pan-tilt head 25 and the long beam detachable detection block 6 or the short beam detachable detection block 7 are detachably connected. The setting of the pan-tilt head 25 can keep the positions of the light source 11, the camera assembly 12 and the laser assembly 14 unchanged. After the separate table 16 drives the lower shell of the battery box to rotate, the positions of the light source 11, the camera assembly 12 and the laser assembly 14 remain unchanged. For some lower shells of the battery box, there is no need to adjust the positions of the light source 11, the camera assembly 12 and the laser assembly 14 to perform visual comparison of other side holes on the lower shell of the battery box, thereby further improving the detection efficiency.

[0035] In this embodiment, the method for using the battery box lower shell inspection fixture can improve the inspection efficiency by rotating the separate table 16 .

[0036] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A battery box lower shell inspection fixture, characterized in that: The invention comprises an operating table (1), a detection pin (2), a thread gauge (3), a go / no-go gauge (4), a bore gauge (5), a long crossbeam detachable detection block (6), a short crossbeam detachable detection block (7), a plurality of movable blocks (8) and a plurality of handheld detection blocks (9); the operating table (1) is provided with a reference seat (26) for sticking to the side of a product and a pressing clamp (27) for clamping the product; the detection pin (2) and the movable block (8) are detachably connected; the movable block (8) and the long crossbeam detachable detection block (6) or the short crossbeam detachable detection block (7) are detachably connected to the operating table (1) and drive the detection pins (26) on the plurality of movable blocks (8) to move. ) is used to inspect the hole positions of the product, the thread gauge (3) is used to inspect and determine whether the size of the thread on the product is qualified, the go / no-go gauge (4) and the aperture gauge (5) are used to inspect and determine whether the size of the hole on the product is qualified, the handheld inspection block (9) is provided with a plurality of plug posts (10) that are inserted into the holes on the product, the long beam detachable inspection block (6) and the short beam detachable inspection block (7) are both detachably connected with a light source (11) and a camera assembly (12), the side of the operating table (1) is detachably connected with a vertically arranged imaging board (13), the camera assembly (12) is used to shoot the projection on the imaging board (13) and compare it with the standard imaging through a computer to inspect and determine whether the position and the aperture of the hole on the product are qualified.

2. The battery box lower shell inspection fixture according to claim 1, characterized in that: The position of the movable block (8) on the long crossbeam detachable detection block (6) or the short crossbeam detachable detection block (7) is adjustable.

3. The battery box lower shell inspection fixture according to claim 1, characterized in that: The positions of the light source (11) and the camera assembly (12) on the long crossbeam detachable detection block (6) or the short crossbeam detachable detection block (7) are adjustable.

4. The battery box lower shell inspection fixture according to claim 3, characterized in that: The long crossbeam detachable detection block (6) and the short crossbeam detachable detection block (7) are both detachably connected with a laser component (14), and the laser emitted by the laser component (14) passes through the holes on the product and irradiates the imaging plate (13) to assist computer image comparison.

5. The battery box lower shell inspection fixture according to claim 4, characterized in that: The position of the laser component (14) on the long crossbeam detachable detection block (6) or the short crossbeam detachable detection block (7) is adjustable.

6. The battery box lower shell inspection fixture according to claim 5, characterized in that: The operating table (1) comprises a movable frame, the movable frame comprises a pulley base (15) and a separate table top (16), the reference seat (26) and the pressure clamp (27) are located on the separate table top (16), and the separate table top (16) can rotate in a horizontal direction.

7. The battery box lower shell inspection fixture according to claim 6, characterized in that: The operating table (1) further comprises a lifting and rotating member, which is arranged on the ground. A magnetic block (17) is arranged on the top of the lifting and rotating member, and a magnet (21) for adsorbing the magnetic block (17) is arranged on the bottom of the separate table top (16). The lifting and rotating member is used to drive the magnetic block (17) to rise and fall and rotate ninety degrees in the horizontal direction. When the magnetic block (17) rises to a high point, the magnetic block (17) and the magnet (21) adsorb and lift up the separate table top (16), and then the lifting and rotating member drives the magnetic block (17) and the separate table top (16) to rotate ninety degrees.

8. The battery box lower shell inspection fixture according to claim 7, characterized in that: The operating platform (1) also includes a guide rail base (22), the lifting and rotating member is located at the center of the guide rail base (22), the bottom surface of the pulley base (15) is provided with a plurality of wheels (23), and the guide rail base (22) is provided with a plurality of slide rails (24) for clamping the wheels (23).

9. The battery box lower shell inspection fixture according to claim 6, characterized in that: The light source (11), the camera assembly (12) and the laser assembly (14) are all fixedly connected to a pan / tilt platform (25), and the pan / tilt platform (25) is detachably connected to a long crossbeam detachable detection block (6) or a short crossbeam detachable detection block (7).

10. A method for using a battery box lower shell inspection tool, applicable to a battery box lower shell inspection tool as claimed in any one of claims 1 to 9, characterized in that: The steps include: S1: placing the lower shell of the battery box as a product on the operating table (1); S2: using the reference seat (26) to position the product, and further fixing the product by the pressing clamp (27); S3: fix a plurality of detection pins (2) on the movable block (8), fix a plurality of movable blocks (8) on the long beam detachable detection block (6), fix a plurality of movable blocks (8) on the short beam detachable detection block (7) in the same manner, and also fix a light source (11) and a camera assembly (12) on the long beam detachable detection block (6) and the short beam detachable detection block (7); S4: The long beam detachable detection block (6) and the short beam detachable detection block (7) are fixed from top to bottom on the operating table (1), the long beam detachable detection block (6) and the short beam detachable detection block (7) are located above the product, and the movable block (8) drives the plurality of detection pins (2) to detect the upward holes of the product; S5: Installing a fixed imaging plate (13) on the side of the operating table (1); S6: Start the light source (11) to illuminate the hole on the side of the product and project a shadow image on the imaging plate (13); S7: the camera assembly (12) takes a picture of the shadow image projected on the imaging plate (13) and transmits the picture to a computer; S8: Comparing the shadow image on the imaging plate (13) with the standard image by a computer and determining whether the position and diameter of the holes on the product are qualified. If the judgment result is qualified, there is no need to detect the position and diameter of these holes. If the judgment result is unqualified, manual re-inspection is performed using a go / no-go gauge (4), an aperture gauge (5) and a handheld inspection block (9) to eliminate computer misjudgment. S9: disassembling the long beam detachable detection block (6) and the short beam detachable detection block (7); S10: Manually inspect the remaining holes using a thread gauge (3), a go / no-go gauge (4), a bore gauge (5) and a handheld inspection block (9).

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