A self-cleaning road inspection vehicle

Abstract

This invention provides a self-cleaning road inspection vehicle, including a vehicle body with a protective shell on the body. The protective shell has an opening on one side and a mounting groove. A mounting frame is slidably disposed within the protective shell along the opening. A detection platform is located at the bottom of the mounting frame, and a camera is mounted at the bottom of the detection platform. A retraction assembly connected to the mounting frame is disposed within the mounting groove. A cleaning mechanism connected via a linkage assembly is also disposed within the protective shell. During the sliding process of the mounting frame, the linkage assembly drives the cleaning mechanism to clean the camera at the bottom of the detection platform. This road inspection vehicle can automatically clean the camera during the sliding of the mounting frame, effectively preventing workers from forgetting the cleaning step and causing blurry images during inspection, thus improving the inspection effect of road inspection.

Description

Technical Field

[0001] This invention relates to the field of road surface inspection technology, and more specifically to a self-cleaning road surface inspection vehicle. Background Technology

[0002] With the continuous increase in highway mileage, in order to further improve the economic and social benefits of highway transportation, China is not only developing highway construction rapidly, but also paying more and more attention to the operation and management of highway traffic, road surface maintenance and service level. Therefore, rapid detection of highway technical condition has become the top priority of road scientific maintenance work.

[0003] Road surface inspection can reveal the technical characteristics of a road, thereby determining its condition and degree of damage, providing crucial information for road construction, maintenance, and management. Multi-functional road inspection vehicles can efficiently and accurately detect road surface technical characteristics and are widely used for the inspection of highways, national, provincial, county, and municipal roads.

[0004] For example, Chinese invention patent No. 201310741851.7 discloses a road inspection vehicle with a CCD camera at the rear of the vehicle whose lens faces downward and extends beyond the edge of the rear of the vehicle body. The camera collects road information and allows the driver to effectively control the speed of the inspection vehicle, ensuring vehicle safety even when the speed is reduced.

[0005] To improve the reliability of information collected from the road surface, cameras or video cameras need to be cleaned regularly to prevent dirt and grime from adhering to the cameras during vehicle operation and causing inaccuracies in the information obtained. Traditional road inspection vehicles require manual cleaning of the cameras on the inspection platform before or after use, but staff often forget this step, resulting in blurry images during the inspection process and reducing the inspection effect. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention proposes a self-cleaning road inspection vehicle to solve the technical problem mentioned in the background art: traditional road inspection vehicles require manual cleaning of the inspection platform's camera before or after use, and workers often forget this step, resulting in blurry images captured during the inspection process and reducing the inspection effect.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a self-cleaning road surface inspection vehicle, comprising:

[0008] The vehicle body is provided with a protective shell, which has an opening on one side and a mounting groove on the protective shell.

[0009] The mounting frame is slidably disposed inside the protective shell along the opening direction of the protective shell. A detection platform is provided at the bottom of the mounting frame, and a camera is provided at the bottom of the detection platform.

[0010] An extension / retraction component is disposed within the mounting slot and connected to the mounting frame to control the mounting frame to extend or retract into the protective housing;

[0011] A cleaning mechanism is installed inside the protective shell and connected to the protective shell via a linkage component. During the sliding process, the mounting frame drives the cleaning mechanism to move through the linkage component to clean the camera at the bottom of the detection platform.

[0012] In a preferred embodiment, the retraction component includes:

[0013] The first connecting bracket has one end hinged to the mounting slot;

[0014] A support frame is mounted on the mounting frame;

[0015] The second connecting frame has one end hinged to the first connecting frame and the other end hinged to the support frame; and

[0016] The first electric telescopic rod has one end hinged to the first connecting frame and the other end hinged to the second connecting frame.

[0017] In a preferred embodiment, the protective shell is provided with a support component connected to the mounting frame, which supports and positions the movement of the mounting frame.

[0018] In a preferred embodiment, the support component includes:

[0019] A first support rod is slidably disposed within the protective housing along its axis; and

[0020] The second support rod is slidably disposed inside the first support rod along the axis of the first support rod, and one end of the second support rod is connected to the support frame.

[0021] In a preferred embodiment, the mounting slot is provided with a hinged first shielding plate, and one end of the first shielding plate is provided with a hinged second shielding plate, which is magnetically connected to one end of the protective shell.

[0022] In a preferred embodiment, four sets of detection platforms are provided at the bottom of the mounting frame, two of which are fixedly connected to the mounting frame, and the other two sets of detection platforms are connected to the mounting frame via a second electric telescopic rod.

[0023] In a preferred embodiment, two sets of the detection platforms are provided with positioning rods, and the bottom of the mounting frame is provided with a positioning track, and the positioning rod is slidably engaged in the positioning track along its axis.

[0024] In a preferred embodiment, the cleaning mechanism includes:

[0025] The movable frame is provided with a guide rail on the vehicle body, and the movable frame is slidably engaged on the guide rail.

[0026] A stop block is provided on the movable frame, and the movable frame is driven to slide by abutting against the stop block during the retraction process;

[0027] A movable plate is slidably disposed within the movable frame. A cleaning block is disposed on the movable plate. The linkage component is connected to the movable plate to drive the movable plate to reciprocate during the movement of the movable frame.

[0028] A reset assembly, disposed within the protective housing and connected to the movable frame, drives the movable frame to reset during the extension of the mounting frame.

[0029] In a preferred embodiment, the linkage component includes:

[0030] The first synchronous pulley is rotatably disposed within the movable frame along its axis, and a control column is eccentrically disposed on the first synchronous pulley;

[0031] A sliding frame is provided at the bottom of the movable plate, and the control column is slidably engaged within the sliding frame;

[0032] The second synchronous pulley is rotatably mounted on the movable frame along its axis and is connected to the first synchronous pulley via a synchronous belt. The second synchronous pulley is equipped with a coaxial gear.

[0033] A rack is disposed inside the protective housing and meshes with the gear.

[0034] In a preferred embodiment, the reset component includes:

[0035] The first mounting rod is disposed inside the protective housing;

[0036] The second mounting rod is disposed on the movable frame;

[0037] The scissor lift consists of two sets of intersecting rods. Each of the four ends of the scissor lift is equipped with a hinged connecting sleeve. The four connecting sleeves are arranged in pairs, with one set slidably fitted onto the first mounting rod and the other set slidably fitted onto the second mounting rod.

[0038] The tension spring is connected at both ends to the two sets of rods in the scissor lift.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] 1. When in use, this road inspection vehicle can move the mounting frame outside the protective shell using the retraction component to perform road inspection via a camera. After the inspection is completed, the mounting frame can be retracted into the protective shell to protect the inspection platform from damage caused by rain or other external factors, thus providing excellent protection for the inspection platform. Furthermore, when the protective shell is retracted or extended using the retraction component, the cleaning mechanism is activated by the linkage component to automatically clean the camera, eliminating the need for manual cleaning by personnel. This effectively prevents personnel from forgetting to clean the camera, resulting in blurry images during the inspection process, thereby improving the inspection effect of the road inspection.

[0041] 2. When the road inspection vehicle retracts the mounting frame into the protective housing via the retraction assembly, the mounting frame, through contact with the stop block, causes the movable frame to slide within the protective housing. During this sliding process, the movable frame drives the second synchronous pulley to rotate via the engagement of gears and racks, which in turn controls the rotation of the first synchronous pulley via a synchronous belt. The rotation of the first synchronous pulley, through the engagement between its eccentrically positioned control column and the sliding frame at the bottom of the movable plate, causes the movable plate to reciprocate. This reciprocating motion of the cleaning block cleans the camera, eliminating the need for manual cleaning. Furthermore, the movement of the movable frame drives the scissor lift to stretch the tension spring. During inspection, when the mounting frame is removed from the protective housing, the tension spring controls the scissor lift to reset, causing the movable frame to move in the opposite direction. This again controls the movement of the cleaning block for a secondary cleaning of the camera, effectively improving the cleaning efficiency. Attached Figure Description

[0042] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0043] Figure 1 A three-dimensional structural schematic diagram of a self-cleaning road inspection vehicle provided by the present invention;

[0044] Figure 2 This is a schematic diagram of the structure of a protective shell in a self-cleaning road inspection vehicle according to the present invention;

[0045] Figure 3 This is a schematic diagram of the internal structure of the protective shell in a self-cleaning road inspection vehicle according to the present invention;

[0046] Figure 4This is a schematic diagram of the structure of a retractable assembly in a self-cleaning road inspection vehicle according to the present invention;

[0047] Figure 5 This is a schematic diagram of the structure of a support component in a self-cleaning road inspection vehicle according to the present invention;

[0048] Figure 6 This is a schematic diagram of the installation structure of the detection platform in a self-cleaning road surface inspection vehicle according to the present invention;

[0049] Figure 7 for Figure 6 A schematic diagram of the disassembled structure;

[0050] Figure 8 This is a schematic diagram of the installation structure of a cleaning brush in a self-cleaning road inspection vehicle according to the present invention;

[0051] Figure 9 for Figure 8 A schematic diagram of the disassembled structure.

[0052] Figure label:

[0053] 101. Vehicle body; 102. Protective shell; 103. Mounting slot; 104. First shield; 105. Second shield; 106. First mounting rod; 107. Rack; 108. Guide rail;

[0054] 201. First connecting frame; 202. Second connecting frame; 203. First electric telescopic rod;

[0055] 301. First support rod; 302. Second support rod; 303. Support frame; 304. Mounting frame; 305. Positioning rail; 306. Testing platform; 307. Second electric telescopic rod; 308. Positioning rod;

[0056] 401. Movable frame; 402. Second mounting rod; 403. Scissor lift bracket; 404. Connecting sleeve; 405. Tension spring; 406. Stop block;

[0057] 501. Movable plate; 502. Cleaning block; 503. Sliding frame; 504. First synchronous pulley; 505. Control column; 506. Second synchronous pulley; 507. Gear; 508. Synchronous belt. Detailed Implementation

[0058] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0059] Example:

[0060] like Figure 1As shown, the present invention provides a self-cleaning road inspection vehicle, including a vehicle body 101, a protective shell 102 disposed on the vehicle body 101, an opening on one side of the protective shell 102, a mounting groove 103 disposed on the protective shell 102, a mounting frame 304 slidably disposed inside the protective shell 102 along the opening direction of the protective shell 102, a detection platform 306 disposed at the bottom of the mounting frame 304, and a camera disposed at the bottom of the detection platform 306.

[0061] When in use, the road inspection vehicle 101 travels on the road. During the inspection process, the mounting frame 304 can be removed from the protective shell 102, and road information can be collected through the inspection platform 306 and the camera at its bottom. After the inspection is completed, the mounting frame 304 can be retracted into the protective shell 102, which protects the inspection platform 306 from damage caused by external factors. Additionally, the inspection platform 306 and the mounting frame 304 can be connected via an inertial navigation system to reduce the impact of vehicle vibrations on the data.

[0062] like Figure 1 , 3 As shown in Figure 4, in this embodiment, a retractable assembly connected to the mounting frame 304 is provided in the mounting slot 103. The retractable assembly controls the mounting frame 304 to extend or retract into the protective shell 102. The retractable assembly includes a first electric telescopic rod 203, a first connecting frame 201, and a second connecting frame 202. One end of the first connecting frame 201 is hinged to the mounting slot 103. A support frame 303 is provided on the mounting frame 304. One end of the second connecting frame 202 is hinged to the first connecting frame 201, and the other end is hinged to the support frame 303. One end of the first electric telescopic rod 203 is hinged to the first connecting frame 201, and the other end is hinged to the second connecting frame 202.

[0063] The first electric telescopic rod 203 can be controlled to extend and retract, thereby driving the second connecting frame 202 to rotate along its hinge point with the first connecting frame 201. When the first electric telescopic rod 203 retracts, the second connecting frame 202 retracts into the first connecting frame 201, thereby controlling the mounting frame 304 to retract into the protective shell 102. When the first electric telescopic rod 203 extends, the second connecting frame 202 rotates in the opposite direction, thereby extending the mounting frame 304 out of the protective shell 102, realizing the retraction and use of the electric control detection platform 306, and improving detection efficiency.

[0064] like Figure 1 , 2As shown, in this embodiment, a hinged first shielding plate 104 is provided on the mounting slot 103, and a hinged second shielding plate 105 is provided at one end of the first shielding plate 104. The second shielding plate 105 can be magnetically connected to one end of the protective shell 102. When the mounting frame 304 extends, the first shielding plate 104 and the second shielding plate 105 can be opened. After the extension is complete, the first shielding plate 104 closes to shield the inside of the protective shell 102. When the mounting frame 304 retracts, the second shielding plate 105 can be magnetically connected to the opening end of the protective shell 102, thereby sealing and shielding the protective shell 102 to prevent rainwater from entering the protective shell 102 and damaging the detection platform 306.

[0065] like Figure 3 , 5 As shown, in this embodiment, a support assembly connected to the mounting frame 304 is provided inside the protective shell 102. The support assembly supports and positions the movement of the mounting frame 304. The support assembly includes a first support rod 301 and a second support rod 302. The first support rod 301 is slidably disposed inside the protective shell 102 along its axis, and the second support rod 302 is slidably disposed inside the first support rod 301 along its axis. One end of the second support rod 302 is connected to the support frame 303.

[0066] During the movement of the mounting frame 304, the first support rod 301 can slide inside the protective shell 102, and the second support rod 302 can slide inside the first support rod 301. Thus, the mounting frame 304 is supported by the cooperation of the first support rod 301 and the second support rod 302, so as to prevent the mounting frame 304 from shifting during the road surface inspection.

[0067] like Figure 6 , 7 As shown, in this embodiment, four sets of detection platforms 306 are provided at the bottom of the mounting frame 304. Two sets of detection platforms 306 are fixedly connected to the mounting frame 304, and the other two sets of detection platforms 306 are connected to the mounting frame 304 via a second electric telescopic rod 307. Positioning rods 308 are provided on the two sets of detection platforms 306, and a positioning rail 305 is provided at the bottom of the mounting frame 304. The positioning rods 308 slide and are engaged within the positioning rail 305 along its axis.

[0068] With the cooperation of four sets of detection platforms 306, the road information collection is more accurate. Furthermore, by controlling the extension of two sets of second electric telescopic rods 307, two sets of detection platforms 306 can be moved to both sides of the vehicle body 101, so as to make the road information collection more comprehensive and improve the detection range.

[0069] like Figure 3 , 8As shown in Figure 9, in this embodiment, a cleaning mechanism is provided inside the protective shell 102. The cleaning mechanism is connected to the protective shell 102 through a linkage component. During the sliding process, the mounting frame 304 drives the cleaning mechanism to move through the linkage component to clean the camera at the bottom of the detection platform 306. The cleaning mechanism includes a movable frame 401. A guide rail 108 is provided on the vehicle body 101. The movable frame 401 is slidably locked on the guide rail 108. A stop block 406 is provided on the movable frame 401. During the retraction process, the mounting frame 304 drives the movable frame 401 to slide by abutting against the stop block 406. A movable plate 501 is also provided inside the movable frame 401. A cleaning block 502 is provided on the movable plate 501. The linkage component is connected to the movable plate 501 to drive the movable plate 501 to slide back and forth during the movement of the movable frame 401.

[0070] The linkage assembly includes a first synchronous wheel 504 rotatably disposed within a movable frame 401 along its axis. A control post 505 is eccentrically disposed on the first synchronous wheel 504. A sliding frame 503 is disposed at the bottom of the movable plate 501, and the control post 505 is slidably locked within the sliding frame 503. A second synchronous wheel 506 rotatably disposed on the movable frame 401 along its axis is also disposed on the movable frame 401. The second synchronous wheel 506 is connected to the first synchronous wheel 504 via a synchronous belt 508. A coaxial gear 507 is disposed on the second synchronous wheel 506. A rack 107 is disposed inside the protective shell 102, and the rack 107 meshes with the gear 507.

[0071] When the mounting frame 304 is retracted into the protective housing 102 via the retraction component, the mounting frame 304 moves directly above the movable frame 401, causing it to abut against the stop block 406. This causes the movable frame 401 to slide along the extension direction of the guide rail 108. During the sliding process, the movable frame 401 rotates the gear 507 via the meshing between the gear 507 and the rack 107, thereby controlling the rotation of the second synchronous pulley 506. The second synchronous pulley 506, in turn, controls the rotation of the first synchronous pulley 504 via the synchronous belt 508, which in turn drives the control column 505. The control column 505, in its movement, interacts with the sliding frame 503 to drive the movable plate 501 to reciprocate, thus causing the cleaning block 502 to move relative to the camera, cleaning the camera. Additionally, it is understood that in some embodiments, the cleaning block 502 can be moistened and a drying device can be added inside the protective housing 102 to improve the cleaning effect on the camera.

[0072] like Figure 2 , 8As shown in Figure 9, in this embodiment, a reset assembly connected to the movable frame 401 is provided inside the protective shell 102. The reset assembly drives the movable frame 401 to reset during the extension of the mounting frame 304. The reset assembly includes a scissor lift 403, a first mounting rod 106 disposed inside the protective shell 102, and a second mounting rod 402 disposed on the movable frame 401. The scissor lift 403 consists of two sets of intersecting rods. Each of the four ends of the scissor lift 403 is provided with a hinged connecting sleeve 404. The four connecting sleeves 404 are arranged in pairs, with one set slidingly sleeved on the first mounting rod 106 and the other set slidingly sleeved on the second mounting rod 402. The two sets of rods in the scissor lift 403 are connected by a tension spring 405.

[0073] During the process of the mounting frame 304 retracting into the protective shell 102 and driving the movable frame 401 to move, the deformation of the scissor lift 403 is controlled by the cooperation of the first mounting rod 106, the second mounting rod 402 and the connecting sleeve 404. In turn, the relative movement of the two sets of rods of the scissor lift 403 stretches the tension spring 405. When the mounting frame 304 extends out of the protective shell 102, the scissor lift 403 is reset under the reset action of the tension spring 405, so that the movable frame 401 is reset, and the movable plate 501 reciprocates again to further clean the camera. This allows the camera to be cleaned once during the retraction and extension of the detection platform 306, improving the cleaning efficiency of the camera and effectively preventing staff from forgetting to clean the camera.

[0074] Specific usage and beneficial effects of the present invention:

[0075] When in use, the road inspection vehicle can extend the first electric telescopic rod 203 to drive the second connecting frame 202 to rotate along its hinge point with the first connecting frame 201, so as to move the mounting frame 304 outside the protective shell 102 for road inspection through the camera. After the inspection is completed, the mounting frame 304 can be retracted into the protective shell 102 to protect the inspection platform 306 and prevent damage to the inspection platform 306 caused by rain or other external factors, thus providing a good protective effect for the inspection platform 306.

[0076] When the road inspection vehicle retracts the mounting frame 304 into the protective shell 102 via the retraction component, the mounting frame 304, through its contact with the stop block 406, causes the movable frame 401 to slide within the protective shell 102. During the sliding process, the movable frame 401 can drive the second synchronous pulley 506 to rotate through the cooperation of the gear 507 and the rack 107, and then control the rotation of the first synchronous pulley 504 through the synchronous belt 508. During the rotation of the first synchronous pulley 504, the cooperation between the eccentrically positioned control column 505 above it and the sliding frame 503 at the bottom of the movable plate 501 drives the movable plate 501 to reciprocate, thereby cleaning the camera through the reciprocating cleaning block 502, eliminating the need for manual cleaning.

[0077] Furthermore, during the movement of the movable frame 401, the scissor lift 403 is driven to move, thereby stretching the tension spring 405. During the inspection, when the mounting frame 304 is moved out of the protective shell 102, the tension spring 405 controls the scissor lift 403 to reset, thereby causing the movable frame 401 to move in the opposite direction, so as to control the movement of the cleaning block 502 again to perform secondary cleaning of the camera. This effectively improves the cleaning effect, eliminates the need for staff to manually clean the camera, and effectively avoids the situation where staff forget the cleaning process, resulting in blurry images during the inspection, thus improving the inspection effect of road surface detection.

[0078] The foregoing has shown and described the basic principles and main features of the present invention and its advantages. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments.

Claims

1. A self-cleaning road inspection vehicle, characterized in that, Including: The vehicle body (101) is provided with a protective shell (102), and the protective shell (102) has an opening on one side and a mounting groove (103) on the protective shell (102). The mounting frame (304) is slidably disposed inside the protective shell (102) along the opening direction of the protective shell (102). A detection platform (306) is provided at the bottom of the mounting frame (304), and a camera is provided at the bottom of the detection platform (306). An extension / retraction component is disposed in the mounting slot (103) and connected to the mounting frame (304) to control the mounting frame (304) to extend or retract into the protective shell (102); A cleaning mechanism is set inside the protective shell (102) and connected to the protective shell (102) through a linkage component. During the sliding process, the mounting frame (304) drives the cleaning mechanism to move through the linkage component to clean the camera at the bottom of the detection platform (306). The cleaning facility includes: The movable frame (401) is provided with a guide rail (108) on the vehicle body (101), and the movable frame (401) is slidably locked on the guide rail (108); A stop block (406) is provided on the movable frame (401). During the retraction of the mounting frame (304), the movable frame (401) is driven to slide by abutting against the stop block (406). An active plate (501) is slidably disposed within the active frame (401). A cleaning block (502) is disposed on the active plate (501). The linkage component is connected to the active plate (501) to drive the active plate (501) to slide back and forth during the movement of the active frame (401). and A reset assembly, disposed within the protective housing (102) and connected to the movable frame (401), is provided to drive the movable frame (401) to reset during the extension of the mounting frame (304). The linkage components include: The first synchronous pulley (504) is rotatably disposed within the movable frame (401) along its axis, and a control column (505) is eccentrically disposed on the first synchronous pulley (504). A sliding frame (503) is provided at the bottom of the movable plate (501), and the control column (505) is slidably engaged in the sliding frame (503); The second synchronous pulley (506) is rotatably mounted on the movable frame (401) along its axis and is connected to the first synchronous pulley (504) via a synchronous belt (508). A coaxial gear (507) is mounted on the second synchronous pulley (506). A rack (107) is disposed inside the protective housing (102) and meshes with the gear (507).

2. The self-cleaning road inspection vehicle according to claim 1, characterized in that, The retracting and extending component includes: The first connecting bracket (201) is hinged at one end to the mounting groove (103); A support frame (303) is disposed on the mounting frame (304); The second connecting frame (202) is hinged at one end to the first connecting frame (201) and at the other end to the support frame (303); and The first electric telescopic rod (203) is hinged at one end to the first connecting frame (201) and at the other end to the second connecting frame (202).

3. The self-cleaning road inspection vehicle according to claim 2, characterized in that, The protective shell (102) is provided with a support component connected to the mounting frame (304), and the movement of the mounting frame (304) is supported and positioned by the support component.

4. A self-cleaning road inspection vehicle according to claim 3, characterized in that, The support components include: The first support rod (301) is slidably disposed inside the protective shell (102) along its axis; and The second support rod (302) is slidably disposed inside the first support rod (301) along the axis of the first support rod (301), and one end of the second support rod (302) is connected to the support frame (303).

5. A self-cleaning road inspection vehicle according to claim 1, characterized in that: The mounting slot (103) is provided with a hinged first shielding plate (104), and a hinged second shielding plate (105) is provided at one end of the first shielding plate (104). The second shielding plate (105) can be magnetically connected to one end of the protective shell (102).

6. A self-cleaning road inspection vehicle according to claim 1, characterized in that: The bottom of the mounting frame (304) is provided with four sets of detection platforms (306), two of which are fixedly connected to the mounting frame (304), and the other two are connected to the mounting frame (304) through a second electric telescopic rod (307).

7. A self-cleaning road inspection vehicle according to claim 6, characterized in that: Two of the detection platforms (306) are equipped with positioning rods (308), and the bottom of the mounting frame (304) is provided with a positioning track (305). The positioning rods (308) are slidably locked in the positioning track (305) along their axis.

8. A self-cleaning road inspection vehicle according to claim 1, characterized in that, The reset component includes: The first mounting rod (106) is disposed inside the protective shell (102); The second mounting rod (402) is disposed on the movable frame (401); The scissor lift (403) consists of two sets of intersecting rods. Each of the four ends of the scissor lift (403) is equipped with a hinged connecting sleeve (404). The four connecting sleeves (404) are arranged in pairs, with one pair slidingly fitted onto the first mounting rod (106) and the other pair slidingly fitted onto the second mounting rod (402). The tension spring (405) is connected at both ends to the two sets of rods in the scissor lift (403).

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