Image recognition equipment capable of automatically adjusting according to object posture

Abstract

The invention relates to the technical field of logistics transmission image recognition, and provides image recognition equipment capable of automatically adjusting according to object postures, which comprises a conveying belt, an adjusting assembly is arranged on the conveying belt, a sorting channel opening is formed in one side of the conveying belt, and a detection assembly is arranged on one side, away from the conveying belt, of the sorting channel opening; according to the invention, the motor drives the turntable and the cylinder to rotate to drive the positive U-shaped rod and the inverted U-shaped rod to swing, so that the connecting rod and the sliding block are pulled to slide and rotate in the arc-shaped groove, the angle of the camera is automatically adjusted, and the position of a bar code or a label is determined; when the sliding block reaches the middle, the camera makes contact with the limiting block and then rotates through the coil spring, the top of goods is detected through the image recognition technology, automatic adjustment of the angle of the camera is achieved through the design, manual intervention is not needed, accurate capture of goods bar codes or labels is ensured, logistics efficiency is effectively improved, human errors are reduced, and the logistics efficiency is improved. And the automation and the accuracy of the whole operation are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of logistics transmission image recognition, and more specifically, to an image recognition device that automatically adjusts according to the posture of an object. Background Art

[0002] In the fields of modern logistics, production line automation, and intelligent warehousing, image recognition technology plays a crucial role. It realizes the automatic tracking, classification, and management of goods by quickly and accurately identifying barcodes, QR codes, or specific tags on the goods.

[0003] Traditional image recognition devices usually use cameras with fixed angles to scan goods. This design performs well when the posture of the goods is fixed and the shape is regular. However, when the posture of the goods changes or the shape is irregular, the recognition effect of the camera will be greatly reduced. In order to capture the barcode or tag of the goods, workers may need to manually adjust the angle of the camera or ensure successful recognition through multiple scans. This not only reduces work efficiency but also increases the risk of human error. The prior art mainly realizes the angle change of the camera through manual adjustment of the mechanical structure, but this method is cumbersome to operate and cannot respond to the dynamic changes of the goods in real time. Summary of the Invention

[0004] The present invention provides an image recognition device that automatically adjusts according to the posture of an object. By automatically adjusting the angle of the camera, it accurately captures the barcode or tag of the goods, improving the logistics efficiency and accuracy; through flexible adjustment of the structural cooperation and spring mechanism, it enhances the adaptability of the device to the size of the goods, simplifies the operation process, and improves the flexibility and efficiency of logistics operations; the arc-shaped push rod design guides the goods to pass smoothly, and the camera monitors in real time. When the barcode or tag is not detected, the automatic flip adjustment process is automatically started to realize the automatic flipping and re-monitoring of the goods, adapting to different packaged goods without manual intervention, further improving the efficiency and accuracy of logistics processing, and meeting the processing requirements of diverse goods, so as to solve the problems raised in the background art.

[0005] The technical solution of the present invention is as follows:

[0006] An image recognition device that automatically adjusts according to the posture of an object, comprising: a conveyor belt, on which an adjustment component is arranged. There are two groups of the adjustment components in total. A sorting channel is arranged on one side of the conveyor belt, and a detection component is arranged on the side of the sorting channel away from the conveyor belt. The adjustment component and the detection component are in a horizontal position;

[0007] The detection component includes a bottom plate fixedly connected to one side of the sorting channel. A second limiting rod is fixedly connected to the top of the bottom plate. A first limiting block is fixedly connected to the top of the second limiting rod. An arc-shaped groove is formed in the first limiting block. A slider is slidably connected in the arc-shaped groove. A camera is arranged on the top of the slider. The camera is connected to the slider through a torsion spring. A second limiting block is fixedly connected to the middle of the first limiting block. The top of the second limiting block is arc-shaped.

[0008] Furthermore, the adjustment component includes a first motor fixedly connected to one side of the conveyor belt. A first connecting rod is fixedly connected to the output end of the first motor. A push rod is fixedly connected to the end of the first connecting rod away from the first motor. The push rod is semicircular, so that when the goods come into contact with the push rod, they can naturally slide along the arc surface of the push rod and are gradually pushed to the other side of the conveyor belt. A first limiting rod is fixedly connected to the end of the push rod away from the first motor. A telescopic rod is rotatably connected to the first limiting rod. The first limiting rods in two groups of the adjustment components are connected by a belt.

[0009] Furthermore, a number of first clamping blocks are equally and fixedly connected to the middle of the first limiting rod. A number of first clamping grooves equal to the first clamping blocks are formed in the part of the telescopic rod connected to the first limiting rod. Through the cooperation of the first clamping blocks and the first clamping grooves, the telescopic rod can be accurately positioned and fixed on the first limiting rod. A baffle is arranged at the end of the telescopic rod away from the first motor. By adjusting the telescopic rod, the position of the baffle can be accurately controlled to ensure stable support for the goods during the turning process. The telescopic rod is rotatably connected to the baffle through a rotating shaft. A micro motor is arranged at the end of the rotating shaft away from the baffle. One end of the rotating shaft is fixedly connected to the output end of the micro motor. The baffle is as long as the push rod and is both on the top of the conveyor belt, but the baffle is perpendicular to the conveyor belt. The surface of the baffle close to the push rod is arc-shaped.

[0010] Furthermore, a second motor is fixedly connected inside the second limiting rod. A turntable is fixedly connected to the output end of the second motor. A first circular groove is formed on one side of the second limiting rod close to the sorting channel. A number of the first circular grooves are provided. The turntable is above the first circular groove. A first cylinder is slidably connected in the first circular groove. A fixed block is fixedly connected to the end of the first cylinder away from the first circular groove.

[0011] Furthermore, a second cylinder is fixedly connected to the side of the turntable away from the second limiting rod;

[0012] Clamping grooves are formed on both sides of the first circular groove. Second clamping blocks are fixedly connected to both sides of the first cylinder.

[0013] Further, a positive U-shaped rod is rotatably connected to one side of the fixed block away from the first cylinder. An inverted U-shaped rod is slidably connected inside the positive U-shaped rod. The second cylinder is slidably connected inside the positive U-shaped rod and the inverted U-shaped rod. One end of the inverted U-shaped rod away from the positive U-shaped rod is rotatably connected to a second connecting rod, and the other end of the second connecting rod away from the inverted U-shaped rod is rotatably connected to the slider.

[0014] Further, a through groove is provided on one side of the positive U-shaped rod;

[0015] One end of the inverted U-shaped rod slidably connected inside the positive U-shaped rod is provided with a second circular groove. A third cylinder with the same diameter as the through groove is slidably connected inside the second circular groove. A spring is fixedly connected between the third cylinder and the second circular groove. One end of the third cylinder away from the second circular groove is semi-circular.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention drives the turntable and the cylinder to rotate through the motor, drives the positive U-shaped rod and the inverted U-shaped rod to swing, and then pulls the connecting rod and the slider to slide and rotate in the arc-shaped groove, thereby automatically adjusting the angle of the camera. When the slider slides to the side of the arc-shaped groove, the camera rotates to monitor the side of the goods to determine the position of the barcode or label; when the slider reaches the middle, after the camera contacts the limit block, it rotates through the torsion spring, and uses image recognition technology to detect the top of the goods. This design realizes the automatic adjustment of the camera angle without manual intervention, ensures the accurate capture of the barcode or label of the goods, effectively improves the logistics efficiency, reduces human errors, and improves the automation and accuracy of the overall operation.

[0018] 2. By flexibly adjusting the cooperation between the cylinder and the circular groove, and using the spring mechanism to control the length between the positive U-shaped rod and the inverted U-shaped rod, the present invention can adapt to goods of different shapes and sizes, significantly improving the flexibility of the logistics and production line. At the same time, the staff can easily pull and rotate the telescopic rod according to the width of the goods, and after adjusting to the appropriate length, fix it through the second clamping block and the second clamping groove to ensure the stable position of the telescopic rod. This design not only simplifies the operation process, but also enhances the adaptability of the equipment to the size of the goods, making the logistics processing more efficient and convenient, meeting the processing needs of diversified goods, and further improving the flexibility and efficiency of the logistics operation.

[0019] 3. The push rod with an arc design in the present invention guides the goods to pass smoothly. Meanwhile, the camera monitors the barcodes or labels of the goods in real time. If the monitoring is successful, the baffle automatically adjusts to be parallel to the conveyor belt, and the goods pass directly. If not detected, the flipping adjustment process is started. The motor drives the connecting rod to rotate, and the push rod and the baffle work together to achieve a 90° flip of the goods, exposing the other side to the camera for re-monitoring. If flipping is still required, the second set of adjustment components takes over to complete it. The first limiting rod is linked through the belt to ensure smooth flipping. This design is suitable for different packaged goods, automatically completes the monitoring of barcodes or labels and the flipping of goods without manual intervention, improving the efficiency and accuracy of logistics processing. Description of the Drawings

[0020] Figure 1 is a three-dimensional view of the device of the present invention;

[0021] Figure 2 is a structural diagram of the adjustment component of the device of the present invention;

[0022] Figure 3 is a structural diagram of the detection component of the device of the present invention;

[0023] Figure 4 is a structural diagram of the turntable of the device of the present invention;

[0024] Figure 5 is a cross-sectional view of the inverted U-shaped rod of the device of the present invention;

[0025] Figure 6 is the present invention Figure 1 enlarged view at A in;

[0026] Figure 7 is the present invention Figure 4 enlarged view at B in.

[0027] In the figure:

[0028] 1. Conveyor belt; 2. Adjustment component; 21. First motor; 22. First connecting rod; 23. Push rod; 24. First limiting rod; 241. First block; 25. Telescopic rod; 251. First slot; 252. Baffle; 26. Belt; 3. Sorting channel; 4. Detection component; 41. Bottom plate; 42. Second limiting rod; 421. Second motor; 422. Turntable; 4221. Second cylinder; 423. First circular groove; 4231. Second slot; 4232. Second block; 424. First cylinder; 425. Fixed block; 4251. Positive U-shaped rod; 42511. Through slot; 4252. Inverted U-shaped rod; 42521. Second circular groove; 42522. Third cylinder; 42523. Spring; 4253. Second connecting rod; 43. First limiting block; 44. Arc-shaped groove; 45. Slide block; 46. Camera; 47. Second limiting block. Detailed Implementation Manner

[0029] The following further describes in detail the embodiments of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0030] As Figures 1 - 7 shown, the present invention provides an image recognition device automatically adjusted according to the object posture, including: a conveyor belt 1, an adjustment component 2 is arranged on the conveyor belt 1, two groups of the adjustment components 2 are provided, a sorting channel 3 is arranged on one side of the conveyor belt 1, a detection component 4 is arranged on the side of the sorting channel 3 away from the conveyor belt 1, and the adjustment component 2 and the detection component 4 are in a horizontal position;

[0031] The detection component 4 includes a bottom plate 41 fixedly connected to one side of the sorting channel 3, a second limiting rod 42 fixedly connected to the top of the bottom plate 41, a first limiting block 43 fixedly connected to the top of the second limiting rod 42, an arc-shaped groove 44 is opened on the first limiting block 43, a slider 45 is slidably connected in the arc-shaped groove 44, a camera 46 is arranged on the top of the slider 45, the camera 46 and the slider 45 are connected by a torsion spring, a second limiting block 47 is fixedly connected to the middle of the first limiting block 43, and the top of the second limiting block 47 is arc-shaped.

[0032] As a technical solution of the present invention, the adjustment component 2 includes a first motor 21 fixedly connected to one side of the conveyor belt 1, a first connecting rod 22 is fixedly connected to the output end of the first motor 21, a push rod 23 is fixedly connected to the end of the first connecting rod 22 away from the first motor 21, the push rod 23 is semicircular, so that when the goods come into contact with the push rod 23, they can naturally slide along the arc surface of the push rod 23 and are gradually pushed to the other side of the conveyor belt 1, a first limiting rod 24 is fixedly connected to the end of the push rod 23 away from the first motor 21, a telescopic rod 25 is rotatably connected to the first limiting rod 24, and the first limiting rods 24 in the two groups of adjustment components 2 are connected by a belt 26, realizing the linkage of the two groups of adjustment components 2.

[0033] As a technical solution of the present invention, a plurality of first clamping blocks 241 are equally and fixedly connected to the middle part of the first limiting rod 24. The part of the telescopic rod 25 connected to the first limiting rod 24 is provided with the same number of first clamping grooves 251 as the first clamping blocks 241. Through the cooperation of the first clamping blocks 241 and the first clamping grooves 251, the telescopic rod 25 can achieve precise positioning and fixation on the first limiting rod 24, and flexibly change the initial position of the baffle 252 to adapt to goods of different sizes or shapes. One end of the telescopic rod 25 away from the first motor 21 is provided with a baffle 252. Through the adjustment of the telescopic rod 25, the position of the baffle 252 can be precisely controlled to ensure stable support for the goods during the turning process. The telescopic rod 25 is rotatably connected to the baffle 252 through a rotating shaft. One end of the rotating shaft away from the baffle 252 is provided with a micro motor, and one end of the rotating shaft is fixedly connected to the output end of the micro motor. The baffle 252 is the same length as the push rod 23 and is both on the top of the conveyor belt 1, but the baffle 252 is perpendicular to the conveyor belt 1. The side of the baffle 252 close to the push rod 23 is arc-shaped.

[0034] As a technical solution of the present invention, a second motor 421 is fixedly connected inside the second limiting rod 42. The output end of the second motor 421 is fixedly connected with a turntable 422. A plurality of first circular grooves 423 are opened on one side of the second limiting rod 42 close to the sorting channel 3. The turntable 422 is above the first circular grooves 423. A first cylinder 424 is slidably connected inside the first circular grooves 423. One end of the first cylinder 424 away from the first circular grooves 423 is fixedly connected with a fixed block 425.

[0035] As a technical solution of the present invention, a second cylinder 4221 is fixedly connected to the side of the turntable 422 away from the second limiting rod 42;

[0036] Second clamping grooves 4231 are opened on both sides of the first circular grooves 423. Second clamping blocks 4232 are fixedly connected to both sides of the first cylinder 424.

[0037] As a technical solution of the present invention, a positive U-shaped rod 4251 is rotatably connected to the side of the fixed block 425 away from the first cylinder 424. An inverted U-shaped rod 4252 is slidably connected inside the positive U-shaped rod 4251. The second cylinder 4221 is slidably connected inside the positive U-shaped rod 4251 and the inverted U-shaped rod 4252. One end of the inverted U-shaped rod 4252 away from the positive U-shaped rod 4251 is rotatably connected with a second connecting rod 4253. One end of the second connecting rod 4253 away from the inverted U-shaped rod 4252 is rotatably connected to the slider 45.

[0038] As a technical solution of the present invention, a through groove 42511 is opened on one side of the positive U-shaped rod 4251;

[0039] One end of the inverted U-shaped rod 4252 that is slidably connected inside the positive U-shaped rod 4251 is provided with a second circular groove 42521. A third cylinder 42522 having the same diameter as the through groove 42511 is slidably connected inside the second circular groove 42521. A spring 42523 is fixedly connected between the third cylinder 42522 and the second circular groove 42521. One end of the third cylinder 42522 away from the second circular groove 42521 is semi-circular.

[0040] Working principle:

[0041] As Figures 3 - 6 and Figure 7 shown, when the conveyor belt 1 carries goods, the staff starts the second motor 421. The second motor 421 drives the turntable 422 to rotate. The turntable 422 drives the second cylinder 4221 to rotate. The second cylinder 4221 slides along the inner grooves of the positive U-shaped rod 4251 and the inverted U-shaped rod 4252, driving the positive U-shaped rod 4251 and the inverted U-shaped rod 4252 to perform a pendulum motion. The inverted U-shaped rod 4252 pulls the second connecting rod 4253 to move. The second connecting rod 4253 pulls the slider 45 to slide in the arc-shaped groove 44. When the slider 45 slides to the side of the arc-shaped groove 44, the slider 45 rotates towards the inner side of the arc-shaped groove 44 according to the arc surface of the arc-shaped groove 44, thereby driving the camera 46 to rotate synchronously, so that the camera 46 can monitor the sides of the goods on the conveyor belt 1, and then determine whether there are barcodes or labels on both sides of the goods. When the slider 45 slides to the middle of the arc-shaped groove 44, since one side of the second limiting block 47 close to the camera 46 is an arc-shaped guiding surface, when the camera 46 contacts the second limiting block 47, the second limiting block 47 pushes the camera 46 to rotate towards the turntable 422 through the coil spring. Through image recognition technology, the camera 46 can detect whether there are barcodes or labels on both sides of the goods. When the camera 46 separates from the second limiting block 47, the coil spring makes the camera 46 automatically reset after the restraint is released. The device can automatically adjust the angle of the camera 46 without manual intervention. This device can ensure the accurate capture of barcodes or labels on goods, improve logistics efficiency, and reduce human errors.

[0042] As Figures 1 - 7As shown in the figure, it should be noted that: according to the height of the goods, the staff inserts the cylinder 424 into the corresponding circular groove 423, and inserts the second clamping block 4232 into the second clamping groove 4231 to prevent the positive U-shaped rod 4251 from driving the fixed block 425 to swing when rotating. At the same time, when adjusting the gap between the fixed block 425 and the turntable 422, the staff presses the cylinder 42522 into the circular groove 42521 and compresses the spring 42523, so that the cylinder 42522 is separated from the through groove 42511, and then the inverted U-shaped rod 4252 can slide without resistance on the positive U-shaped rod 4251 until it slides to the next through groove 42511. The spring 42523 loses its restrictive force and pushes the cylinder 42522 out of the circular groove 42521 and into the through groove 42511, so that the length between the positive U-shaped rod 4251 and the inverted U-shaped rod 4252 is fixed. This device can handle goods of different shapes and sizes, improving the flexibility of logistics and production lines;

[0043] First, the staff pulls the telescopic rod 25 in the direction where the first limiting rod 24 does not have the first clamping block 241 according to the width of the goods, then rotates the telescopic rod 25 until the length reaches about two-thirds of the length of the goods, and then pushes the telescopic rod 25 in the direction where the first limiting rod 24 has the first clamping block 241, so that the first clamping block 241 is inserted into the first clamping groove 251.

[0044] As Figures 2 - 3 and Figure 6As shown in the figure, when the goods are conveyed to the push rod 23, due to the arc-shaped design of the top of the push rod 23, the side of the goods will naturally slide along the arc at the top of the push rod 23 to the top of the push rod 23. At this time, the camera 46 starts to work to monitor the barcode or label of the goods. If the camera 46 successfully monitors the barcode or label of the goods, the device will immediately start the micro-motor to drive the rotation of the rotating shaft, making the baffle 252 parallel to the conveyor belt 1. At the same time, the telescopic rod 25 starts to pull the baffle 252 towards the conveyor belt 1 to ensure that the baffle 252 is in close contact with the conveyor belt 1. At this time, the conveyor belt 1 drives the goods to directly pass through the arc on the side of the baffle 252 and continue to be conveyed forward without the need for flipping adjustment; if the camera 46 fails to monitor the barcode or label of the goods, the device will enter the next flipping adjustment process. When the goods reach the top of the push rod 23, as the goods gradually move towards the baffle 252 and come into contact with the baffle 252, the first motor 21 is started to drive the first connecting rod 22 to rotate counterclockwise. The first connecting rod 22 drives the push rod 23 and the first limiting rod 24 to rotate synchronously. The push rod 23 pushes one side of the goods, while the baffle 252 holds the other side of the goods, driving the goods to achieve a 90° flip. After the flip, the rear side of the goods is exposed to the lens of the camera 46, and the camera 46 monitors the barcode or label again. If there is still no barcode or label on this side, then the goods will be flipped by the second set of adjustment components 2. When the first set of adjustment components 2 flips the goods, the rotation of the first limiting rod 24 of the first set drives the rotation of the first limiting rod 24 of the second set through the belt 26. If the goods are in bags, only one side needs to be flipped.

[0045] The embodiments of the present invention are given for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. An image recognition device automatically adjusted according to the object posture, comprising: Conveyor belt (1), characterized in that: an adjustment assembly (2) is provided on the conveyor belt (1), two groups of the adjustment assemblies (2) are provided in total, a sorting channel (3) is provided on one side of the conveyor belt (1), a detection assembly (4) is provided on the side of the sorting channel (3) away from the conveyor belt (1), and the adjustment assembly (2) and the detection assembly (4) are in a horizontal position; The detection assembly (4) includes a bottom plate (41) fixedly connected to one side of the sorting channel (3), a second limiting rod (42) fixedly connected to the top of the bottom plate (41), a first limiting block (43) fixedly connected to the top of the second limiting rod (42), an arc-shaped groove (44) is formed in the first limiting block (43), a slider (45) is slidably connected in the arc-shaped groove (44), a camera (46) is provided on the top of the slider (45), and the camera (46) is connected to the slider (45) through a coil spring. A second limiting block (47) is fixedly connected to the middle of the first limiting block (43), and the top of the second limiting block (47) is arc-shaped.

2. The image recognition device automatically adjusted according to the object posture as described in claim 1, characterized in that: The adjustment assembly (2) includes a first motor (21) fixedly connected to one side of the conveyor belt (1), a first connecting rod (22) is fixedly connected to the output end of the first motor (21), a push rod (23) is fixedly connected to the end of the first connecting rod (22) away from the first motor (21), the push rod (23) is semi-circular, a first limiting rod (24) is fixedly connected to the end of the push rod (23) away from the first motor (21), a telescopic rod (25) is rotatably connected to the first limiting rod (24), and the first limiting rods (24) in the two adjustment assemblies (2) are connected by a belt (26).

3. The image recognition device automatically adjusted according to the object posture as claimed in claim 2, wherein: A number of first clamping blocks (241) are equally divided and fixedly connected to the middle of the first limiting rod (24), a number of first clamping grooves (251) equal to the first clamping blocks (241) are formed in the part of the telescopic rod (25) connected to the first limiting rod (24), a baffle (252) is provided at the end of the telescopic rod (25) away from the first motor (21), the telescopic rod (25) is rotatably connected to the baffle (252) through a rotating shaft, a micro motor is provided at the end of the rotating shaft away from the baffle (252), one end of the rotating shaft is fixedly connected to the output end of the micro motor, the baffle (252) is as long as the push rod (23) and is both on the top of the conveyor belt (1), but the baffle (252) is perpendicular to the conveyor belt (1), and the surface of the baffle (252) close to the push rod (23) is arc-shaped.

4. The image recognition device automatically adjusted according to the object posture as described in claim 1, characterized in that: A second limiting rod (42) is fixedly connected with a second motor (421) inside. The output end of the second motor (421) is fixedly connected with a turntable (422). A first circular groove (423) is formed on one side of the second limiting rod (42) close to the sorting channel (3). There are several first circular grooves (423). The turntable (422) is above the first circular groove (423). A first cylinder (424) is slidably connected in the first circular groove (423). One end of the first cylinder (424) away from the first circular groove (423) is fixedly connected with a fixed block (425).

5. The image recognition device automatically adjusted according to the object posture as claimed in claim 4, wherein: One side of the turntable (422) away from the second limiting rod (42) is fixedly connected with a second cylinder (4221); Second clamping grooves (4231) are formed on both sides of the first circular groove (423). Second clamping blocks (4232) are fixedly connected to both sides of the first cylinder (424).

6. The image recognition device automatically adjusted according to the object posture as claimed in claim 5, characterized in that: One side of the fixed block (425) away from the first cylinder (424) is rotatably connected with a positive U-shaped rod (4251). An inverted U-shaped rod (4252) is slidably connected in the positive U-shaped rod (4251). The second cylinder (4221) is slidably connected in the positive U-shaped rod (4251) and the inverted U-shaped rod (4252). One end of the inverted U-shaped rod (4252) away from the positive U-shaped rod (4251) is rotatably connected with a second connecting rod (4253). One end of the second connecting rod (4253) away from the inverted U-shaped rod (4252) is rotatably connected to the slider (45).

7. The image recognition device automatically adjusted according to the object posture as described in claim 6, characterized in that: A through groove (42511) is formed on one side of the positive U-shaped rod (4251); One end of the inverted U-shaped rod (4252) slidably connected in the positive U-shaped rod (4251) is provided with a second circular groove (42521). A third cylinder (42522) with the same diameter as the through groove (42511) is slidably connected in the second circular groove (42521). A spring (42523) is fixedly connected between the third cylinder (42522) and the second circular groove (42521). One end of the third cylinder (42522) away from the second circular groove (42521) is semicircular.

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