A municipal road detection device

Abstract

The application relates to a municipal road detection device which comprises a trolley, a cleaning mechanism and a detection mechanism; the trolley comprises a storage rack, the bottom of the storage rack is rotationally connected with two rotating shafts, and the two ends of the rotating shafts are fixedly sleeved with rollers; the cleaning mechanism comprises a rotating roller which is transmissionally connected with one of the rotating shafts through a linkage unit, a plurality of cleaning units are circumferentially arranged on the rotating roller, the cleaning units comprise scrapers and brushes; the rotating roller is internally hollow, and the side wall of the rotating roller is provided with a plurality of air injection holes which are communicated with the interior of the rotating roller; a high-pressure air pump is installed on the storage rack, and the air outlet pipe of the high-pressure air pump is communicated with the interior of the rotating roller; the detection mechanism comprises a mounting seat, a pressure sensor and a recorder which are installed on the storage rack, and a processor, the mounting seat is rotationally connected with a detection wheel, the upper side of the detection wheel abuts against a pressing unit, and the pressure sensor and the recorder are coupled with the processor. The application is convenient to store and transport and can improve the accuracy of detection results.

Description

Technical Field

[0001] This application relates to the technical field of road inspection, and in particular to a municipal road inspection device. Background Technology

[0002] Road surface smoothness refers to the deviation of the longitudinal unevenness of the road surface. A good road surface requires good smoothness. Road surface smoothness is an important indicator in road evaluation and road construction acceptance. Therefore, road surface smoothness needs to be tested during road construction acceptance.

[0003] A search revealed Chinese Patent Publication No. CN114892479A, which discloses a smoothness testing device for municipal road construction. The device includes a base with a first support plate bolted to its bottom. A second support plate is installed at the bottom of the base. A linkage wheel and a cleaning shovel are mounted on the second support rod, and a cleaning brush is mounted on the bottom of the connecting rod inside the connecting sleeve. When the device is moved, it can not only sweep away dust but also remove mud from the road surface, minimizing the risk of unevenness caused by external forces. The detection wheel inside the moving base moves up and down on uneven surfaces, driving the matching wheel to move up and down, which in turn moves the fixed rod up and down inside the fixed sleeve. With the use of a pressure block and a pressure sensor, a data recorder records changes in the pressure sensor readings, improving both testing efficiency and effectiveness.

[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: the sequential and spaced arrangement of the cleaning shovel, cleaning brush, and detection wheel results in a large horizontal space occupied by the detection equipment, making it inconvenient to store and transport the equipment; some of the soil cleaned by the cleaning shovel and cleaning brush will still adhere to or remain on the road surface in front of the detection wheel, causing the detection wheel to press down on this soil during rolling, leading to inaccurate detection results. Therefore, improvements are needed. Summary of the Invention

[0005] To facilitate storage and transportation and improve the accuracy of test results, this application provides a municipal road testing device.

[0006] The present application provides a municipal road inspection device, which adopts the following technical solution: a municipal road inspection device, including a trolley, a cleaning mechanism and an inspection mechanism; The cart includes a shelf, and the bottom of the shelf is rotatably connected to two horizontally arranged pivots. Both ends of the pivots are fixedly fitted with rollers for contacting the ground. The cleaning mechanism includes a rotating roller that is coaxially arranged with two rotating shafts and rotatably connected to the shelf around its own axis. The rotating roller is connected to one of the rotating shafts through a linkage unit. The rotating shaft will drive the rotating roller to rotate through the linkage unit. The rotating roller is provided with several cleaning units in the circumferential direction. The cleaning units include scrapers and brushes installed on the side wall of the rotating roller and used to contact the road surface. The interior of the rotating roller is hollow, and the side wall of the rotating roller has several air jet holes that connect to the interior of the rotating roller and face the cleaning unit; a high-pressure air pump is installed on the shelf, and the air outlet pipe of the high-pressure air pump is rotatably connected to the rotating roller and connected to the interior of the rotating roller around the axis of the rotating roller. The detection mechanism includes a mounting base connected to the shelf via a shock absorber, a pressure sensor mounted on the shelf, a recorder, and a processor. A detection wheel for contacting the road surface is rotatably connected to the mounting base. The upper side of the detection wheel abuts against a compression unit that slides vertically to the shelf and is used to compress the pressure sensor. Both the pressure sensor and the recorder are coupled to the processor. When the pressure value detected by the pressure sensor changes, the pressure sensor will transmit the pressure value to the processor and send a recording signal. The processor will then control the recorder to record the pressure value of the pressure sensor.

[0007] Optionally, the cleaning unit also includes two sawtooth plates mounted on the side wall of the rotating roller and used to contact the road surface. The sawtooth plates are staggered, and the two sawtooth plates, scraper and brush are arranged in sequence.

[0008] Optionally, a collection box is installed on the shelf, with the opening of the collection box facing the rotating roller. A guide plate is installed at the opening of the collection box to guide the soil cleaned by the cleaning unit into the collection box. The height of the upper surface of the guide plate gradually decreases from the collection box to the rotating roller, and the guide plate is spaced apart from the road surface.

[0009] Optionally, the collection box has a discharge port on the side away from the rotating roller, and a pull-out box is inserted into the discharge port. The opening of the pull-out box is located at the high end of the guide plate and is used to collect the soil that enters the collection box from the guide plate.

[0010] Optionally, when the cleaning unit moves to the opening of the collection box, the air jets located around the cleaning unit will tilt upwards and spray air towards the cleaning unit.

[0011] Optionally, a sealing shell is installed on the collection box, and a rotating roller is located inside the sealing shell. Both ends of the rotating roller are rotatably inserted through the sealing shell. The sealing shell is provided with an air outlet facing the opening of the collection box. A scraper is rotatably embedded in the sealing shell. The scraper not located at the air outlet and the inner wall of the sealing shell together form a sealing cavity.

[0012] Optionally, the linkage unit includes a linkage rod coaxially arranged with the rotating roller and rotatably connected to the shelf around its own axis. A first synchronous pulley is fixedly sleeved on both the linkage rod and one of the rotating shafts. The same first synchronous belt is sleeved on both first synchronous pulleys. The diameter of the first synchronous pulley on the linkage rod is smaller than the diameter of the first synchronous pulley on the rotating shaft. A second synchronous pulley is fixedly sleeved on both the linkage rod and the rotating roller. The same second synchronous belt is sleeved on both second synchronous pulleys. The diameter of the second synchronous pulley on the linkage rod is larger than the diameter of the second synchronous pulley on the rotating roller.

[0013] In summary, this application includes the following beneficial technical effects: 1. During the rotation of the rotating roller, the two serrated plates will tear the soil attached to the road surface in turn, the scraper will scrape off the torn soil, and the brush will sweep away the remaining soil; In this application, the serrated plates, scraper and brush are all set on the rotating roller, which reduces the horizontal space occupied by the testing equipment and facilitates the storage and transportation of the testing equipment. 2. Under the action of the high-pressure air pump, the outside air will be pressurized and enter the inside of the rotating roller. Then the high-pressure gas will be sprayed out from the jet hole to the cleaning unit and the road surface, so that the mud attached to the cleaning unit and the mud on the road surface in front of the detection mechanism will be blown away, improving the accuracy of the detection results. 3. During the process of the rotating roller driving the cleaning unit to clean the soil, some of the soil cleaned by the cleaning unit will be pushed to the upper surface of the guide plate. As the cleaning unit rotates, it will push the soil to continue to slide upward on the upper surface of the guide plate and fall into the collection box, thus collecting the soil and preventing the soil from being pushed to the road surface in front of the detection mechanism, which would instead continuously affect the detection of the detection equipment. 4. The high-pressure gas inside the rotating roller can only be sprayed onto the road surface or the cleaning unit located at the opening of the collection box through the air jet hole, which increases the spray speed of the high-pressure gas and improves the cleaning effect on the mud attached to the cleaning unit and the road surface. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure from below in the embodiments of this application; Figure 2 This is a top view of the overall structure in the embodiments of this application; Figure 3 This is a schematic cross-sectional view of the overall structure in the embodiments of this application; Figure 4 This is a cross-sectional view of the collection box and sealing shell in an embodiment of this application; Figure 5 This is a schematic diagram of the rotating roller and cleaning unit in the embodiments of this application.

[0015] Reference numerals: 1. Trolley; 11. Shelf; 12. Shaft; 13. Roller; 14. Handle; 15. Collection box; 151. Guide plate; 152. Waste discharge port; 16. Pull-out box; 17. Sealing shell; 171. Air outlet; 172. Sealing cavity; 2. Cleaning mechanism; 21. Rotating roller; 22. Linkage unit; 221. Linkage rod; 222. First synchronous pulley; 223. First synchronous belt; 224. Second synchronous belt 225. Wheel; 23. Second synchronous belt; 23. Cleaning unit; 231. Serrated plate; 232. Scraper; 233. Brush; 234. Air jet; 24. High-pressure air pump; 25. Sealed bearing; 36. Detection mechanism; 31. Mounting base; 32. Pressure sensor; 33. Recorder; 34. Processor; 35. Detection wheel; 36. Extrusion unit; 361. Vertical rod; 362. Rotating wheel; 363. Pressure block; 37. Shock absorber. Detailed Implementation

[0016] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0017] This application discloses a municipal road inspection device. For example... Figure 1 As shown, a municipal road inspection device includes a trolley 1, a cleaning mechanism 2, and an inspection mechanism 3.

[0018] like Figure 1 and Figure 2 As shown, the cart 1 includes a shelf 11, with two horizontally arranged pivots 12 rotatably connected to the bottom of the shelf 11. Rollers 13 are fixedly fitted at both ends of each pivot 12 for contacting the ground. A push handle 14 is installed on the top of the shelf 11. Workers can push the push handle 14 to make the rollers 13 roll on the ground, facilitating the movement and transportation of the cart 1.

[0019] The cleaning mechanism 2 includes a rotating roller 21 coaxially arranged with two rotating shafts 12 and rotatably connected to the bottom of the shelf 11. The rotating roller 21 is driven to one of the rotating shafts 12 via a linkage unit 22. The rotating roller 21 is circumferentially provided with several cleaning units 23. During the rolling process of the roller 13, the roller 13 will drive the rotating roller 21 to rotate via the rotating shaft 12 and the linkage unit 22. The rotating roller 21 will drive the cleaning units 23 to rotate and clean the mud on the road surface.

[0020] The linkage unit 22 includes a linkage rod 221 coaxially arranged with the rotating roller 21 and rotatably connected to the shelf 11 around its own axis. A first synchronous pulley 222 is fixedly sleeved on the linkage rod 221 and one of the rotating shafts 12. The same first synchronous belt 223 is sleeved on the two first synchronous pulleys 222. The diameter of the first synchronous pulley 222 on the linkage rod 221 is smaller than the diameter of the first synchronous pulley 222 on the rotating shaft 12. A second synchronous pulley 224 is fixedly sleeved on the linkage rod 221 and the rotating roller 21. The same second synchronous belt 225 is sleeved on the two second synchronous pulleys 224. The diameter of the second synchronous pulley 224 on the linkage rod 221 is larger than the diameter of the second synchronous pulley 224 on the rotating roller 21.

[0021] During the rolling process of roller 13, roller 13 will drive linkage rod 221 to rotate faster through shaft 12, first synchronous wheel 222 and first synchronous belt 223. Linkage rod 221 will drive rotating roller 21 to rotate faster through second synchronous wheel 224 and second synchronous belt 225, so that cleaning unit 23 can clean the mud on the road surface at a faster speed, thereby improving the mud cleaning effect.

[0022] like Figures 3 to 5 As shown, the cleaning unit 23 includes two serrated plates 231, a scraper 232, and a brush 233, which are sequentially installed on the side wall of the rotating roller 21. The serrations on the two serrated plates 231 are staggered. During the rotation of the rotating roller 21, the two serrated plates 231 will tear the mud attached to the road surface in sequence, the scraper 232 will scrape off the torn mud, and the brush 233 will sweep away the remaining mud. In this application, the serrated plates 231, scraper 232, and brush 233 are all set on the rotating roller 21, which reduces the horizontal space occupied by the testing equipment and facilitates the storage and transportation of the testing equipment.

[0023] The interior of the rotating roller 21 is hollow, and the side wall of the rotating roller 21 is provided with a number of air jet holes 234 that are connected to the interior of the rotating roller 21 and face the cleaning unit 23.

[0024] like Figure 1 and Figure 3 As shown, a high-pressure air pump 24 is installed on the shelf 11, and the air outlet pipe of the high-pressure air pump 24 is connected to the inside of the rotating roller 21. A sealed bearing 25 is fixedly sleeved on the air outlet pipe of the high-pressure air pump 24, and the sealed bearing 25 is fixedly embedded in the rotating roller 21, so that the air outlet pipe of the high-pressure air pump 24 is rotatably connected to the rotating roller 21 around the axis of the rotating roller 21.

[0025] Under the action of the high-pressure air pump 24, external air will be pressurized and enter the interior of the rotating roller 21. Then, the high-pressure gas will be sprayed out from the jet hole 234 to the cleaning unit 23 and the road surface, so that the mud attached to the cleaning unit 23 and the mud on the road surface in front of the detection mechanism 3 will be blown away, improving the accuracy of the detection results.

[0026] like Figure 3 and Figure 4 As shown, a collection box 15 is installed at the bottom of the shelf 11. The opening of the collection box 15 faces the rotating roller 21. An arc-shaped guide plate 151 is installed at the opening of the collection box 15. The height of the upper surface of the guide plate 151 gradually decreases from the collection box 15 to the rotating roller 21. The guide plate 151 is spaced apart from the road surface, so that the guide plate 151 is not easy to rub against the road surface.

[0027] During the process of the rotating roller 21 driving the cleaning unit 23 to clean the soil, some of the soil cleaned by the cleaning unit 23 will be pushed to the upper surface of the guide plate 151. During the rotation of the cleaning unit 23, the soil will be pushed to continue to slide upward on the upper surface of the guide plate 151 and fall into the collection box 15, thus realizing the collection of soil and preventing the soil from being pushed to the road surface in front of the detection mechanism 3, which would instead continuously affect the detection of the detection equipment.

[0028] It is worth noting that when the cleaning unit 23 moves to the opening of the collection box 15, the air jet holes 234 located around the cleaning unit 23 will tilt upward and spray air towards the cleaning unit 23. The high-speed airflow ejected from the air jet holes 234 will tilt upward and blow away the soil attached to the cleaning unit 23, thereby improving the cleaning effect on the soil on the cleaning unit 23 and preventing the cleaning unit 23 from having too much soil attached to it, which would affect the cleaning effect on the road surface.

[0029] The collection box 15 has a discharge port 152 on the side away from the rotating roller 21. A pull-out box 16 is inserted into the discharge port 152, and the opening of the pull-out box 16 is located at the high end of the guide plate 151. Soil entering the collection box 15 from the upper surface of the guide plate 151 will fall into the pull-out box 16. The pull-out box 16 can be pulled out from the collection box 15 for dumping the soil.

[0030] A sealing shell 17 is installed at the opening of the collection box 15. The rotating roller 21 is located inside the sealing shell 17, and both ends of the rotating roller 21 are rotatably inserted through the sealing shell 17. The sealing shell 17 is provided with an air outlet 171 facing the opening of the collection box 15. The scraper 232 is rotatably embedded in the sealing shell 17. The scraper 232 not located at the air outlet 171 and the inner wall of the sealing shell 17 together form a sealing cavity 172, so that the high-pressure gas in the rotating roller 21 cannot be ejected from the air jet hole 234 located in the sealing cavity 172, thus reducing the number of air jet holes 234 that can eject gas. The high-pressure gas in the rotating roller 21 can only be ejected from the air jet hole 234 facing the opening of the collection box 15 onto the road surface or the cleaning unit 23 located at the opening of the collection box 15, which increases the ejection speed of the high-pressure gas and improves the cleaning effect on the soil attached to the cleaning unit 23 and the road surface.

[0031] like Figures 1 to 3 As shown, the detection mechanism 3 includes a mounting base 31 connected to the shelf 11 via four shock absorbers 37, a pressure sensor 32 mounted on the shelf 11, a recorder 33 and a processor 34. A detection wheel 35 for contacting the road surface is rotatably connected to the mounting base 31. The upper side of the detection wheel 35 contacts a squeezing unit 36 ​​that slides vertically on the shelf 11. The pressure sensor 32 and the recorder 33 are both coupled to the processor 34.

[0032] When the detection wheel 35 rolls on the uneven ground, the detection wheel 35 will vibrate up and down. At this time, the detection wheel 35 will cause the compression unit 36 ​​to vibrate up and down, which will cause the pressure value detected by the pressure sensor 32 to change. The pressure sensor 32 will transmit the pressure value to the processor 34 and send a recording signal. The processor 34 will control the recorder 33 to record the pressure value of the pressure sensor 32. The workers can then observe the summary table of pressure values ​​recorded by the recorder 33 to know the smoothness of the road surface.

[0033] The extrusion unit 36 ​​includes a vertical rod 361 that slides vertically through the shelf 11, thereby achieving a sliding connection between the vertical rod 361 and the shelf 11. The lower end of the vertical rod 361 is rotatably connected to a rotating wheel 362 that abuts against the upper side of the detection wheel 35. The rotating wheel 362 can be driven to rotate by the detection wheel 35, reducing the wear of the rotating wheel 362 and the detection wheel 35. The upper end of the vertical rod 361 is equipped with a pressure block 363 for extruding the pressure sensor 32. The pressure block 363 is used to press the pressure sensor 32. When the vertical rod 361 vibrates up and down, the pressure of the pressure block 363 on the pressure sensor 32 will change, so that the worker can determine the smoothness of the road surface by the value recorded by the recorder 33.

[0034] The implementation principle of a municipal road inspection device according to an embodiment of this application is as follows: when a worker pushes a cart 1 to move on the road surface by pushing a pusher 14, the roller 13 will drive the linkage rod 221 to rotate faster through the rotating shaft 12, the first synchronous wheel 222 and the first synchronous belt 223, and the linkage rod 221 will drive the rotating roller 21 to rotate faster through the second synchronous wheel 224 and the second synchronous belt 225.

[0035] During the rotation of the rotating roller 21, the two serrated plates 231 will tear the soil attached to the road surface in turn. The scraper 232 will scrape off the torn soil, the brush 233 will sweep away the remaining soil, and the cleaning unit 23 will push the soil to the upper surface of the guide plate 151, so that the soil continues to slide upward on the upper surface of the guide plate 151 and falls into the pull-out box 16 through the collection box 15, thus realizing the collection of soil and preventing the soil from being pushed to the road surface in front of the detection mechanism 3 by the cleaning unit 23.

[0036] At the same time, external air will be pressurized by the high-pressure air pump 24 and enter the rotating roller 21. The high-pressure gas will be sprayed out from the jet hole 234 to the cleaning unit 23 and the road surface, so that the mud attached to the cleaning unit 23 and the mud on the road surface in front of the detection mechanism 3 will be blown away, so as to prevent the cleaning unit 23 from having too much mud attached to it and affecting the cleaning effect of the cleaning unit 23 on the road surface.

[0037] When the detection wheel 35 rolls on the uneven ground, the detection wheel 35 will vibrate up and down. At this time, the detection wheel 35 will cause the compression unit 36 ​​to vibrate up and down, which will cause the pressure value detected by the pressure sensor 32 to change. The pressure sensor 32 will transmit the pressure value to the processor 34 and send a recording signal. The processor 34 will control the recorder 33 to record the pressure value of the pressure sensor 32. The workers can then observe the summary table of pressure values ​​recorded by the recorder 33 to know the smoothness of the road surface.

[0038] In summary, this application arranges the serrated plate 231, scraper 232, and brush 233 on the rotating roller 21, reducing the horizontal space occupied by the testing equipment and facilitating its storage and transportation. The serrated plate 231, scraper 232, brush 233, and high-pressure gas ejected from the jet hole 234 will sequentially clean the mud on the road surface, thoroughly cleaning the road surface in front of the testing wheel 35. This makes it less likely for mud to interfere with the testing wheel 35's detection of ground flatness, thus improving the testing effect of the equipment.

[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A municipal road inspection device, characterized in that: It includes a trolley (1), a cleaning mechanism (2), and a testing mechanism (3); The cart (1) includes a shelf (11), and the bottom of the shelf (11) is rotatably connected to two horizontally arranged pivots (12). Both ends of the pivots (12) are fixedly fitted with rollers (13) for contacting the road surface. The cleaning mechanism (2) includes a rotating roller (21) that is coaxially arranged with two rotating shafts (12) and rotatably connected to the shelf (11) around its own axis. The rotating roller (21) is connected to one of the rotating shafts (12) through a linkage unit (22). The rotating shaft (12) will drive the rotating roller (21) to rotate through the linkage unit (22). The rotating roller (21) is provided with several cleaning units (23) in the circumferential direction. The cleaning unit (23) includes a scraper (232) and a brush (233) installed on the side wall of the rotating roller (21) and used to contact the road surface. The interior of the rotating roller (21) is hollow, and the side wall of the rotating roller (21) is provided with several air jet holes (234) that are connected to the interior of the rotating roller (21) and face the cleaning unit (23); a high-pressure air pump (24) is installed on the shelf (11), and the air outlet pipe of the high-pressure air pump (24) is rotatably connected to the rotating roller (21) around the axis of the rotating roller (21) and connected to the interior of the rotating roller (21); A collection box (15) is installed on the shelf (11). The opening of the collection box (15) faces the rotating roller (21). A guide plate (151) is installed at the opening of the collection box (15) to guide the soil cleaned by the cleaning unit (23) into the collection box (15). The height of the upper surface of the guide plate (151) gradually decreases from the collection box (15) towards the rotating roller (21). The guide plate (151) is spaced apart from the road surface. A sealing shell (17) is installed on the container. A rotating roller (21) is located inside the sealing shell (17). Both ends of the rotating roller (21) are rotatably inserted through the sealing shell (17). The sealing shell (17) is provided with an air outlet (171) facing the opening of the collection box (15). A scraper (232) is rotatably embedded in the sealing shell (17). The scraper (232) not located at the air outlet (171) and the inner wall of the sealing shell (17) together form a sealing cavity (172). The detection mechanism (3) includes a mounting base (31) connected to the shelf (11) via a shock absorber (37), a pressure sensor (32) mounted on the shelf (11), a recorder (33) and a processor (34). A detection wheel (35) for contacting the road surface is rotatably connected to the mounting base (31). The upper side of the detection wheel (35) contacts a squeezing unit (36) that slides vertically on the shelf (11) and is used to squeeze the pressure sensor (32). The pressure sensor (32) and the recorder (33) are both coupled to the processor (34). When the pressure value detected by the pressure sensor (32) changes, the pressure sensor (32) will transmit the pressure value to the processor (34) and send a recording signal. The processor (34) will control the recorder (33) to record the pressure value of the pressure sensor (32).

2. The municipal road inspection equipment according to claim 1, characterized in that: The cleaning unit (23) also includes two sawtooth plates (231) installed on the side wall of the rotating roller (21) and used to contact the road surface. The sawtooths on the two sawtooth plates (231) are staggered. The two sawtooth plates (231), scraper (232) and brush (233) are arranged in sequence.

3. The municipal road inspection equipment according to claim 1, characterized in that: The collection box (15) has a discharge port (152) on the side away from the rotating roller (21). A pull-out box (16) is inserted into the discharge port (152). The opening of the pull-out box (16) is located at the high end of the guide plate (151) and is used to collect the soil that enters the collection box (15) from the guide plate (151).

4. The municipal road inspection equipment according to claim 1, characterized in that: When the cleaning unit (23) moves to the opening of the collection box (15), the jet holes (234) located around the cleaning unit (23) will tilt upward and spray jets toward the cleaning unit (23).

5. A municipal road inspection device according to claim 1, characterized in that: The linkage unit (22) includes a linkage rod (221) coaxially arranged with the rotating roller (21) and rotatably connected to the shelf (11) around its own axis. A first synchronous wheel (222) is fixedly sleeved on the linkage rod (221) and one of the rotating shafts (12). The same first synchronous belt (223) is sleeved on the two first synchronous wheels (222). The diameter of the first synchronous wheel (222) on the linkage rod (221) is smaller than the diameter of the first synchronous wheel (222) on the rotating shaft (12). A second synchronous wheel (224) is fixedly sleeved on the linkage rod (221) and the rotating roller (21). The same second synchronous belt (225) is sleeved on the two second synchronous wheels (224). The diameter of the second synchronous wheel (224) on the linkage rod (221) is larger than the diameter of the second synchronous wheel (224) on the rotating roller (21).

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