Tire pattern detection device

Abstract

The invention discloses a tread pattern detection device, and belongs to the technical field of tread pattern detection.The tread pattern detection device comprises a supporting mechanism for supporting a vehicle, and wheel rolling mechanisms for driving wheels to rotate are arranged at the tops of the two ends in the supporting mechanism; tire pattern scanning mechanisms used for tire pattern detection are arranged at the bottoms of the two ends in the supporting mechanism, cleaning mechanisms matched with the tire pattern scanning mechanisms are arranged in the middles of the two ends in the supporting mechanism, and a driving mechanism is arranged in the middle of the interior of the supporting mechanism. Front wheels or rear wheels of a vehicle are moved to the two pairs of rotating rollers on the detection bin, then the two pairs of rotating rollers are driven by the driving mechanism to synchronously rotate in the same direction, then the wheels are driven to rotate, tread patterns on the outer ring of a tire are detected in the process, and therefore tread pattern detection can be rapidly conducted on different positions of the surface of the tire, and the detection efficiency is improved. And the tire tread detection accuracy of the tire tread detection device is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of tire tread detection, and in particular relates to a tire tread detection device. Background Art

[0002] Tires are the load-bearing parts of a car. The integrity of the tires, especially the degree of tread wear, directly affects the performance, safety and fuel consumption of the entire vehicle. Generally, the integrity of the tire is judged by the size of the tread and the wear of the pattern. Therefore, a device for accurately detecting tread wear is needed.

[0003] Current tread detection devices usually directly detect the tread at a specified position on the tire surface, and it is necessary to manually move the tread detection device to realize tread detection at different positions on the tire surface; and when detecting the tread on the tire surface, it is also necessary to manually move the detection device longitudinally, so that the detection device moves from one side of the tire surface to the other side, so as to achieve longitudinal detection of the tire surface; at the same time, during the long-term use of the tread detection device, a large amount of dust is attached to the surface of the detection component of the tread detection device, and the attached dust will greatly affect the accuracy of the detection component in detecting the tire tread. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a tire tread detection device.

[0005] The technical solution adopted to solve the above technical problems is: a tire tread detection device, including a supporting mechanism for supporting a vehicle, a wheel rolling mechanism for driving the wheel to rotate is arranged at the top of both ends of the supporting mechanism, a tire tread scanning mechanism for tire tread detection is arranged at the bottom of both ends of the supporting mechanism, a cleaning mechanism cooperating with the tire tread scanning mechanism is arranged at the middle position of both ends of the supporting mechanism, a driving mechanism providing driving force for the wheel rolling mechanism, the tire tread scanning mechanism and the cleaning mechanism is arranged at the middle position inside the supporting mechanism, the supporting mechanism includes a connecting bin, detection bins are symmetrically installed at both ends of the connecting bin, and a square through groove is opened on the top of the detection bin, auxiliary slopes are symmetrically installed on both sides of the detection bin, a display screen is installed at the middle position of the top of the connecting bin, and a control panel is installed on the top of the connecting bin.

[0006] Furthermore, the wheel rolling mechanism includes a first bearing, and the first bearings are symmetrically installed on the tops of both ends of the detection chamber, and the inner rings of the two groups of first bearings on the same side are jointly installed with a rotating roller, and the rotating roller extends from one end close to the connecting chamber to the interior of the connecting chamber and is installed with a connecting head.

[0007] Through the above technical solution, the driving mechanism can drive the rotating roller to rotate stably and uniformly through the connecting head, and the two pairs of rotating rollers can also drive the front wheels or rear wheels of the vehicle to rotate stably and uniformly during the rotation, so that the tread scanning mechanism can perform comprehensive tread detection on the tire tread.

[0008] Furthermore, the tread scanning mechanism includes a first screw located at a middle position inside a detection chamber, a movable platform is provided on an outer thread of the first screw, sliding rods passing through both sides of the movable platform are symmetrically installed on both sides inside the detection chamber, and a laser ranging sensor is installed at a middle position on the top of the sliding rod, one end of the first screw away from the connecting chamber is transmission-connected to one end of an adjacent group of rotating rollers through a first linkage assembly, a protective chamber covering the first linkage assembly is installed at one end of the detection chamber away from the connecting chamber, a partition plate is installed at a middle position inside the detection chamber, the movable platform is located below the partition plate, and the rotating rollers are located on both sides of the top of the partition plate, and a protective lens is installed at a middle position on the top of the partition plate.

[0009] Through the above technical solution, during the rotation of the rotating roller, the rotating roller drives the first screw to rotate through the first linkage assembly, and the thread action forces the moving platform to slide on the two sets of sliding rods, allowing the laser ranging sensor on the moving platform to follow the horizontal movement, and then allowing the laser ranging sensor to detect the tread of the wheels on the two sets of rotating rollers through the protective lens, and the protective chamber can completely cover the first linkage assembly for protection.

[0010] Furthermore, the cleaning mechanism includes two groups of second screw rods located at the top of the detection chamber, and the outer sides of the two groups of second screw rods are commonly threaded with a movable plate, and a cleaning brush for cleaning the surface of the protective lens is installed at the bottom of the movable plate. The end of the second screw rod close to the connecting chamber is transmission connected to one end of an adjacent group of rotating rollers through a second linkage assembly.

[0011] Through the above technical solution, while the driving mechanism drives the rotating roller to rotate through the connecting head, the rotating roller drives the two sets of second screw rods to rotate synchronously in the same direction through the second linkage assembly, and the thread action forces the movable plate to move horizontally above the protective lens, and then the cleaning brush at the bottom of the movable plate cleans the dust on the surface of the protective lens, ensuring the cleanliness of the surface of the protective lens, thereby ensuring the accuracy of the tire tread detection device in detecting the tire tread.

[0012] Furthermore, the driving mechanism includes a servo motor located at one end of the bottom of the connecting bin, driving shafts are symmetrically arranged on both sides of the connecting bin, and two groups of bearing seats fixedly connected to the inner wall of the connecting bin are installed at the middle position of the outer side of the driving shaft. The output end of the servo motor drives the two groups of driving shafts to rotate synchronously through a third linkage assembly, and the two ends of the driving shaft are transmission-connected to one end of two adjacent groups of rotating rollers through a connecting head.

[0013] Through the above technical solution, the control panel controls the servo motor to cooperate with the third linkage component to drive the two sets of drive shafts to rotate synchronously, and the rotating drive shafts drive the rotating rollers to follow the synchronous rotation through the connecting head, driving the wheels to roll on the two pairs of rotating rollers.

[0014] Furthermore, the first linkage assembly includes a first pulley installed on a rotating shaft at one end of the rotating roller, one end of the first screw rod extends to the interior of the protection bin and is also installed with a first pulley, and the two sets of first pulleys are connected by a first transmission belt.

[0015] Through the above technical solution, during the rotation of the rotating roller, the rotating roller drives the first screw to rotate stably and uniformly through the first pulley and the first transmission belt, thereby forcing the mobile platform to slide horizontally on the two sets of sliding rods, which helps the laser ranging sensor on the mobile platform to detect the tire tread more comprehensively.

[0016] Furthermore, the second linkage assembly includes a second pulley, and the two groups of the second screw rods extend to the interior of the connecting warehouse near one end of the connecting warehouse and are installed with a second pulley, and the two groups of the rotating rollers are installed with a third pulley on the rotating shaft near one end of the connecting warehouse, and the third pulley is connected to the adjacent group of second pulleys through a second transmission belt.

[0017] Through the above technical solution, when the driving mechanism drives the two pairs of rotating rollers to rotate, the third pulley at one end of the rotating roller drives a group of second screw rods connected to it to rotate through the second pulley and the second transmission belt, and then uses the thread action to force the movable plate to move horizontally above the protective lens.

[0018] Furthermore, the third linkage assembly includes a first synchronous pulley installed at the output end of the servo motor, and second synchronous pulleys are symmetrically installed on the outer side of the two groups of driving shafts close to the servo motor, and a synchronous belt is commonly provided on the outer side of the two groups of second synchronous pulleys and the first synchronous pulley.

[0019] Through the above technical solution, the servo motor is controlled by the control panel to drive the first synchronous pulley to rotate, and the first synchronous pulley drives the two sets of driving shafts to rotate synchronously in the same direction through the synchronous belt and the second synchronous pulley.

[0020] Furthermore, the longitudinal section of the middle portion of the partition plate is an isosceles trapezoidal structure, and drainage holes are provided on the outer sides of the protection chamber and the detection chamber.

[0021] The above technical solution helps to bring the laser ranging sensor closer to the top of the detection chamber, improves the accuracy of the laser ranging sensor in detecting tire tread, and also leaves space for the two sets of rotating rollers. After rainwater enters the detection chamber through the square groove, it will enter the protection chamber through the drainage hole and then be discharged from the protection chamber to the external environment.

[0022] Furthermore, two groups of second bearings are symmetrically installed at the middle positions of the two ends in the detection chamber, and the two ends of the outer side of the second screw rod are respectively fixedly connected to the inner rings of the two adjacent groups of second bearings.

[0023] Through the above technical solution, when the driving shaft drives the two sets of second screw rods to rotate through the second linkage assembly, the second bearing helps to improve the stability of the rotation of the second screw rods.

[0024] The beneficial effects of the present invention are as follows: 1. The present invention moves the front wheel or the rear wheel of the vehicle to the two pairs of rotating rollers on the detection chamber, and then drives the two pairs of rotating rollers to rotate synchronously in the same direction through the driving mechanism, thereby driving the wheel to rotate. During the process, the tread of the outer ring of the tire is detected, so that the tread can be quickly detected at different positions on the tire surface, thereby improving the accuracy of the tread detection device for the tire tread; 2. The present invention can perform longitudinal detection of the tread on the surface of the tire through the tread scanning mechanism to ensure the accuracy of the tire tread detection, and in combination with the above-mentioned structure for driving the wheel to rotate, the tread can be detected on the surface of the entire tire, so that the tread detection device can perform comprehensive tread detection on the tire, thereby improving the detection effect of the entire tread detection device; 3. In the process of the tread scanning mechanism of the present invention performing tread detection on the tire, the driving force of the driving mechanism is used to drive the cleaning brush to clean the surface of the protective lens above the laser ranging sensor, so that the laser ranging sensor can detect the tread of the tire more accurately, reduce the influence of dust on the detection data of the entire tread detection device, thereby further improving the accuracy of the tread detection device for the tread detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0026] Figure 2 is a top view of the present invention;

[0027] Figure 3 is a top cross-sectional view of the present invention;

[0028] Figure 4 It is a three-dimensional schematic diagram of the detection chamber of the present invention;

[0029] Figure 5 is a first side sectional view of the connection bin of the present invention;

[0030] Figure 6 is a second side sectional view of the connecting bin of the present invention;

[0031] Figure 7 is a side sectional view of the detection chamber of the present invention;

[0032] Figure 8 is a three-dimensional schematic diagram of a partition plate of the present invention;

[0033] Fig. 9 It is a three-dimensional schematic diagram of the movable plate of the present invention;

[0034] Fig.10 The present invention Figure 3 The enlarged schematic diagram of point A in the middle;

[0035] Fig.11 The present invention Figure 7 A magnified schematic diagram of point B in the middle.

[0036] Reference numerals: 1. support mechanism; 101. connection chamber; 102. detection chamber; 103. square through groove; 104. auxiliary slope; 105. display screen; 106. control panel; 107. drainage hole; 2. wheel rolling mechanism; 201. rotating roller; 202. first bearing; 203. connector; 3. tread scanning mechanism; 301. first screw rod; 302. moving platform; 303. sliding rod; 304. laser ranging sensor; 305. first linkage assembly; 3051. first pulley; 3052. first transmission belt; 306 , protection bin; 307, partition plate; 308, protection lens; 4, cleaning mechanism; 401, second screw rod; 402, moving plate; 403, cleaning brush; 404, second linkage assembly; 4041, second pulley; 4042, third pulley; 4043, second transmission belt; 405, second bearing; 5, driving mechanism; 501, bearing seat; 502, driving shaft; 503, servo motor; 504, third linkage assembly; 5041, first synchronous pulley; 5042, second synchronous pulley; 5043, synchronous belt. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] like Figure 3-Figure 5 and Figure 7-Figure 11As shown, a tread scanning mechanism 3 for tread detection is arranged at the bottom of both ends of the support mechanism 1, and the tread scanning mechanism 3 includes a first screw rod 301 located at the middle position inside the detection chamber 102, and a moving platform 302 is arranged on the outer thread of the first screw rod 301, and sliding rods 303 passing through the two sides of the moving platform 302 are symmetrically installed on both sides of the detection chamber 102, and a laser ranging sensor 304 is installed at the middle position of the top of the sliding rod 303, and the end of the first screw rod 301 away from the connection chamber 101 is transmission-connected to one end of an adjacent group of rotating rollers 201 through a first linkage assembly 305, and the first The linkage assembly 305 includes a first pulley 3051 installed on the rotating shaft at one end of the rotating roller 201, and one end of the first screw rod 301 extends to the inside of the protection chamber 306 and is also installed with a first pulley 3051, and the two sets of first pulleys 3051 are connected by a first transmission belt 3052. The rotating roller 201 drives the first screw rod 301 to rotate stably and uniformly through the first pulley 3051 and the first transmission belt 3052, thereby forcing the moving platform 302 to slide horizontally on the two sets of sliding rods 303. The end of the detection chamber 102 away from the connection chamber 101 is installed with a first linkage assembly 305 cover The protective chamber 306 is formed in a raised position, and a partition plate 307 is installed in the middle position of the detection chamber 102. The longitudinal section of the middle part of the partition plate 307 is an isosceles trapezoidal structure. The outer sides of the protective chamber 306 and the detection chamber 102 are provided with drainage holes 107, which can leave space for the two sets of rotating rollers 201. After the rainwater enters the detection chamber 102 through the square groove 103, it will enter the protective chamber 306 through the drainage holes 107, and then be discharged from the protective chamber 306 to the external environment. The mobile platform 302 is located below the partition plate 307, and the rotating roller 201 is located below the partition plate 307. On both sides of the top, protective lenses 308 are installed in the middle position of the top of the partition plate 307. During the rotation of the rotating roller 201, the rotating roller 201 drives the first screw 301 to rotate through the first linkage component 305, and uses the thread action to force the moving platform 302 to slide on the two sets of sliding rods 303, allowing the laser ranging sensor 304 on the moving platform 302 to follow the horizontal movement, and then allowing the laser ranging sensor 304 to detect the tread of the wheels on the two sets of rotating rollers 201 through the protective lenses 308, and the protective chamber 306 can completely cover the first linkage component 305 for protection.

[0039] like Figure 4 , Figure 6 and Figure 9-11As shown, a cleaning mechanism 4 that cooperates with the tire tread scanning mechanism 3 is arranged at the middle position of the two ends of the support mechanism 1, and the cleaning mechanism 4 includes two groups of second screw rods 401 located at the top of the inner part of the detection chamber 102, and the outer sides of the two groups of second screw rods 401 are commonly threaded with a movable plate 402, and the bottom of the movable plate 402 is installed with a cleaning brush 403 for cleaning the surface of the protective lens 308. The end of the second screw rod 401 close to the connecting chamber 101 is transmission-connected to one end of an adjacent group of rotating rollers 201 through a second linkage assembly 404, and the second linkage assembly 404 includes a second pulley 4041. The ends of the two groups of second screw rods 401 close to the connecting chamber 101 extend to the interior of the connecting chamber 101 and are installed with a second pulley 4041. The two groups of rotating rollers 201 are close to the connecting chamber 101. A third pulley 4042 is installed on the rotating shaft near one end of the connecting bin 101, and the third pulley 4042 is connected to an adjacent group of second pulleys 4041 through a second transmission belt 4043. When the driving mechanism 5 drives the two pairs of rotating rollers 201 to rotate, the third pulley 4042 at one end of the rotating roller 201 drives a connected group of second screw rods 401 to rotate through the second pulley 4041 and the second transmission belt 4043, and then uses the thread action to force the movable plate 402 to move horizontally above the protective lens 308, so that the cleaning brush 403 at the bottom of the movable plate 402 cleans the dust on the surface of the protective lens 308, thereby ensuring the cleanliness of the surface of the protective lens 308, thereby ensuring the accuracy of the tire tread detection device in detecting the tire tread.

[0040] like Figure 5 , Figure 6 and Fig.11As shown, a driving mechanism 5 providing driving force for the wheel rolling mechanism 2, the tread scanning mechanism 3 and the cleaning mechanism 4 is arranged at the middle position inside the supporting mechanism 1, and the driving mechanism 5 includes a servo motor 503 located at one end of the bottom of the connecting chamber 101, and driving shafts 502 are symmetrically arranged on both sides inside the connecting chamber 101, and two groups of bearing seats 501 fixedly connected to the inner wall of the connecting chamber 101 are installed at the middle position of the outer side of the driving shaft 502, and the output end of the servo motor 503 drives the two groups of driving shafts 502 to rotate synchronously through the third linkage assembly 504, and the third linkage assembly 504 includes a first synchronous pulley 5041 installed at the output end of the servo motor 503, and the outer sides of the two groups of driving shafts 502 are close to each other. A second synchronous pulley 5042 is symmetrically installed near one end of the servo motor 503, and a synchronous belt 5043 is commonly provided on the outer sides of the two sets of second synchronous pulleys 5042 and the first synchronous pulley 5041. The servo motor 503 is controlled to drive the first synchronous pulley 5041 to rotate, and the first synchronous pulley 5041 drives the two sets of driving shafts 502 to rotate synchronously in the same direction through the synchronous belt 5043 and the second synchronous pulley 5042. The two ends of the driving shaft 502 are transmission-connected to one end of the two adjacent sets of rotating rollers 201 through the connecting head 203. When the rotating driving shaft 502 drives the rotating roller 201 to rotate through the connecting head 203, it can drive the wheels to roll on the two pairs of rotating rollers 201.

[0041] The working principle of this embodiment is as follows: first, the front wheel or rear wheel of the vehicle is moved to the top of the detection chamber 102 through the auxiliary ramp 104, and the tire is placed between the two groups of rotating rollers 201, and the rotating rollers 201 support the tire. Then, the driving mechanism 5 is controlled to drive the two pairs of rotating rollers 201 to rotate synchronously in the same direction at a uniform speed. Then, the laser ranging sensor 304 is controlled to start detecting the tread of the tire. While the driving mechanism 5 drives the two pairs of rotating rollers 201 to rotate, the driving mechanism 5 drives the first screw rod 301 to rotate through the rotating rollers 201 to drive the first linkage component 305 to drive the first screw rod 301 to rotate, forcing the moving platform 302 to slide on the sliding rod 303, and driving the laser ranging sensor 304 on the moving platform 302 to move horizontally. At the same time, the driving mechanism 5 also drives the two groups of second screw rods 401 to rotate synchronously at a uniform speed through the second linkage component 404, forcing the moving plate 402 to move synchronously horizontally with the moving platform 302. During the process, the cleaning brush 403 at the bottom of the moving plate 402 cleans the surface of the protective lens 308.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A tire tread detection device, comprising a support mechanism (1) for supporting a vehicle, characterized in that: The tops of both ends of the support mechanism (1) are provided with wheel rolling mechanisms (2) for driving the wheels to rotate, the bottoms of both ends of the support mechanism (1) are provided with tread scanning mechanisms (3) for detecting treads, the middle positions of both ends of the support mechanism (1) are provided with cleaning mechanisms (4) that cooperate with the tread scanning mechanisms (3), and the middle position of the support mechanism (1) is provided with a driving mechanism (5) that provides driving force for the wheel rolling mechanism (2), the tread scanning mechanism (3) and the cleaning mechanism (4); The support mechanism (1) comprises a connection chamber (101), detection chambers (102) are symmetrically mounted at both ends of the connection chamber (101), a square through slot (103) is provided on the top of the detection chamber (102), auxiliary slopes (104) are symmetrically mounted on both sides of the detection chamber (102), a display screen (105) is mounted at the middle position of the top of the connection chamber (101), and a control panel (106) is mounted on the top of the connection chamber (101).

2. The tire tread detection device according to claim 1, characterized in that: The wheel rolling mechanism (2) comprises a first bearing (202), the first bearings (202) are symmetrically mounted on the tops of both ends of the detection chamber (102), and the inner rings of the two groups of first bearings (202) on the same side are jointly mounted with a rotating roller (201), and one end of the rotating roller (201) close to the connection chamber (101) extends into the interior of the connection chamber (101) and is mounted with a connecting head (203).

3. The tire tread detection device according to claim 1, characterized in that: The tread scanning mechanism (3) comprises a first screw rod (301) located at a middle position inside the detection chamber (102); a movable platform (302) is provided on the outer thread of the first screw rod (301); sliding rods (303) passing through the two sides of the movable platform (302) are symmetrically installed on both sides inside the detection chamber (102); a laser distance measuring sensor (304) is installed at a middle position on the top of the sliding rod (303); an end of the first screw rod (301) away from the connection chamber (101) is connected to the first connecting assembly (305) via a first linkage assembly (305); One end of an adjacent group of rotating rollers (201) is connected in a transmission manner; a protective chamber (306) for covering a first linkage assembly (305) is installed at one end of the detection chamber (102) away from the connection chamber (101); a partition plate (307) is installed at a middle position inside the detection chamber (102); the moving platform (302) is located below the partition plate (307); the rotating rollers (201) are located on both sides of the top of the partition plate (307); and a protective lens (308) is installed at a middle position on the top of the partition plate (307).

4. The tire tread detection device according to claim 1, characterized in that: The cleaning mechanism (4) comprises two groups of second screw rods (401) located at the top end inside the detection chamber (102); a movable plate (402) is commonly threadedly arranged on the outer sides of the two groups of second screw rods (401); a cleaning brush (403) for cleaning the surface of the protective lens (308) is installed at the bottom of the movable plate (402); and one end of the second screw rod (401) close to the connection chamber (101) is transmission-connected to one end of an adjacent group of rotating rollers (201) via a second linkage assembly (404).

5. The tire tread detection device according to claim 1, characterized in that: The driving mechanism (5) comprises a servo motor (503) located at one end of the bottom of the connection chamber (101); driving shafts (502) are symmetrically arranged on both sides of the connection chamber (101); and two groups of bearing seats (501) fixedly connected to the inner wall of the connection chamber (101) are installed at the middle position of the outer side of the driving shaft (502); the output end of the servo motor (503) drives the two groups of driving shafts (502) to rotate synchronously through a third linkage assembly (504); and the two ends of the driving shaft (502) are transmission-connected to one end of two adjacent groups of rotating rollers (201) through a connector (203).

6. The tire tread detection device according to claim 3, characterized in that: The first linkage assembly (305) comprises a first pulley (3051) mounted on a rotating shaft at one end of the rotating roller (201); one end of the first screw rod (301) extends to the interior of the protection bin (306) and is also equipped with a first pulley (3051); and the two sets of first pulleys (3051) are connected by a first transmission belt (3052).

7. The tire tread detection device according to claim 4, characterized in that: The second linkage assembly (404) comprises a second pulley (4041), one end of the two sets of the second screw rods (401) close to the connecting bin (101) extends into the interior of the connecting bin (101) and is installed with the second pulley (4041), and the rotating shafts of the two sets of the rotating rollers (201) close to one end of the connecting bin (101) are installed with a third pulley (4042), and the third pulley (4042) is connected to the adjacent set of second pulleys (4041) through a second transmission belt (4043).

8. The tire tread detection device according to claim 5, characterized in that: The third linkage assembly (504) comprises a first synchronous pulley (5041) installed at the output end of the servo motor (503), and second synchronous pulleys (5042) are symmetrically installed at one end of the outer side of the two sets of driving shafts (502) close to the servo motor (503), and a synchronous belt (5043) is commonly provided on the outer side of the two sets of second synchronous pulleys (5042) and the first synchronous pulley (5041).

9. The tire tread detection device according to claim 3, characterized in that: The longitudinal section of the middle portion of the partition plate (307) is an isosceles trapezoidal structure, and drainage holes (107) are provided on the outer sides of the protection chamber (306) and the detection chamber (102).

10. The tire tread detection device according to claim 4, characterized in that: Two groups of second bearings (405) are symmetrically installed at the middle positions of the two ends in the detection chamber (102), and the two ends of the outer side of the second screw rod (401) are respectively fixedly connected to the inner rings of the two adjacent groups of second bearings (405).

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