Seamless wheelbase adjustment mechanism and lift

Abstract

This invention discloses a seamless wheelbase adjustment mechanism and a lift. The seamless wheelbase adjustment mechanism is applied to a lift, which includes a frame with a through clearance opening at the position corresponding to the vehicle's wheels. The seamless wheelbase adjustment mechanism includes: a wheel-bearing mechanism disposed at the clearance opening for bearing the wheels; a drive mechanism for driving the wheel-bearing mechanism to move horizontally along a first direction, the length direction of the vehicle; and a follower mechanism connected to the wheel-bearing mechanism, moving along the first direction with the wheel-bearing mechanism and blocking the gap between the wheel-bearing mechanism and the frame. After battery replacement, when the vehicle leaves the lift and passes between the wheel-bearing mechanism and the frame, it will not experience a jerking sensation or get stuck due to running over the gap. This prevents the two plates forming the gap from fatigue fracture due to long-term wheel impact, thus improving the user experience.

Description

[0001] This application claims priority to Chinese patent application 202123030478.3, filed on December 2, 2021. The entire contents of the aforementioned Chinese patent application are incorporated herein by reference. Technical Field

[0002] This invention relates to the field of electric vehicle battery swapping, specifically a seamless wheelbase adjustment mechanism and a lift. Background Technology

[0003] Battery swapping stations are used to replace batteries in electric vehicles. After a vehicle enters the station, its wheels are positioned on a lift, which controls the vehicle's lifting and lowering to facilitate battery swapping. Chinese invention patent CN213734646U discloses a front wheel lifting platform. By adjusting the longitudinal position of the front wheels through a front wheel alignment device, the overall wheelbase of the vehicle can be adjusted. Both the front and rear wheel lifting platforms can accommodate vehicles with different wheelbases, making the battery swapping bay suitable for swapping various vehicle models and effectively increasing its versatility. However, when the front wheel longitudinal adjustment component of the front wheel alignment device moves longitudinally, a gap is created between it and the front frame body. Over long-term use, the two plates with this gap frequently contact the vehicle's wheels and experience significant localized stress, making them prone to fatigue fracture. The gap also causes a jerky feeling when the vehicle moves from the front frame body into the front wheel longitudinal adjustment component and vice versa, resulting in a poor user experience. Summary of the Invention

[0004] The present invention addresses the technical problem in the prior art where gaps between the front wheel longitudinal adjustment component and the front frame body lead to localized fatigue of the plate and a jerky feeling when the vehicle enters or exits the front wheel lifting platform, resulting in a poor user experience. The invention provides a seamless wheelbase adjustment mechanism and a lifting machine.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A seamless wheelbase adjustment mechanism is applied to a lift, the lift including a frame, the frame having a through clearance opening at the position corresponding to the vehicle's wheels, the seamless wheelbase adjustment mechanism including:

[0007] The wheel-bearing mechanism installed at the clearance opening is used to support the wheel;

[0008] A drive mechanism is used to drive the wheel-bearing mechanism to move horizontally along a first direction, the first direction being the length direction of the vehicle;

[0009] A follower mechanism is connected to the wheel-bearing mechanism and moves along the first direction with the wheel-bearing mechanism, thus blocking the gap between the wheel-bearing mechanism and the frame.

[0010] In this solution, before battery swapping, the lift's wheel-bearing mechanism supports the vehicle's two wheels. Under the control of the drive mechanism, the wheel-bearing mechanism moves horizontally, adaptively adjusting the wheel's stopping position in the first direction. This allows the lift to accommodate vehicles with different wheelbases, ensuring the adjusted wheelbase position is suitable for battery swapping. The follow-up mechanism blocks the gap between the wheel-bearing mechanism and the frame, preventing the vehicle from experiencing jerking or getting stuck when passing between them after battery replacement, thus improving the user experience. Furthermore, the two plates forming the gap will not fatigue and break due to long-term wheel impact, preventing foreign objects from falling through the gap.

[0011] Preferably, the wheel bearing mechanism includes a mounting frame and a wheel positioning mechanism. The mounting frame has an upward-facing mounting groove, and the wheel positioning mechanism is disposed in the mounting groove. The wheel positioning mechanism is used to position the wheel.

[0012] The mounting bracket moves horizontally along the first direction under the drive of the drive mechanism;

[0013] The follow-up mechanism is used to cover the gap between the mounting bracket and the frame.

[0014] In this design, when the wheels reach the lift, the wheel positioning mechanism positions them. When the drive mechanism drives the mounting bracket, it causes the bracket to move horizontally, thereby adjusting the vehicle's wheelbase through the wheel positioning mechanism.

[0015] Preferably, the follow-up mechanism includes an extension plate, and at least one end of the mounting bracket is horizontally provided with the extension plate along the first direction to cover the gap between one end of the mounting bracket corresponding to the extension plate and the frame.

[0016] In this design, the extension plate can move together with the mounting bracket, thereby blocking the gap between the mounting bracket and the frame, preventing the wheels from driving directly from the mounting slot onto the frame and causing a jerking sensation, or the wheels from driving directly from the frame onto the mounting slot and causing a jerking sensation.

[0017] Preferably, the upper surface of the extension plate is flush with the upper surface of the mounting groove.

[0018] In this solution, when the vehicle leaves after battery swapping, the wheels drive out from the wheel positioning mechanism and smoothly transition from the mounting slot to the upper surface of the extension plate, without causing vibration due to the height difference between the mounting slot and the upper surface of the extension plate. Similarly, when the vehicle drives from the frame of the lift into the mounting slot of the mounting frame, the wheels smoothly transition from the upper surface of the extension plate into the mounting slot, ensuring the stability of the vehicle's movement.

[0019] Preferably, there are two extension plates, which are horizontally arranged at both ends of the mounting frame along the first direction.

[0020] In this solution, regardless of whether the mounting bracket is adjusted forward or backward along the first direction under the drive mechanism, the gap between the mounting bracket and the frame can be blocked by the extension plate.

[0021] Preferably, the follow-up mechanism further includes a blocking mechanism, which includes a baffle and a linkage component;

[0022] The baffle is connected to the mounting frame via the linkage component. The baffle moves with the mounting frame in a first direction and blocks the gap between the frame and the mounting frame.

[0023] In this design, the baffle moves with the mounting frame, thereby blocking the gap between the frame and the mounting frame and preventing the vehicle from getting stuck or shaking when passing through the gap.

[0024] Preferably, the baffle is disposed between the frame and the extension plate, and the baffle is slidable relative to the frame along the first direction;

[0025] The linkage assembly includes a first connecting part connected to the baffle, a second connecting part connected to the mounting bracket, and a linkage rod. The two ends of the linkage rod pass through the first connecting part and the second connecting part, respectively, and both ends of the linkage rod are provided with limiting members. The first connecting part and the second connecting part are located between the two limiting members, and the limiting members are used to prevent the first connecting part or the second connecting part from detaching from the linkage rod.

[0026] In this solution, the baffle moves with the mounting frame via a linkage component, eliminating the need for a separate power mechanism for the follow-up mechanism and reducing costs.

[0027] Preferably, the first connecting part has a first connecting hole, the second connecting part has a second connecting hole, and the two ends of the linkage rod pass through the first connecting hole and the second connecting hole respectively. The first connecting hole and the second connecting hole are both clearance-fitted with the circumferential outer surface of the linkage rod.

[0028] In this solution, when the mounting bracket moves a certain distance in the first direction, the baffle will abut against the frame, preventing the baffle from moving further. At this time, the distance between the first connecting part and the second connecting part will approach each other, so that the baffle and the frame will not interfere with each other.

[0029] Preferably, the shielding mechanism further includes an elastic element disposed between the first connecting portion and the second connecting portion, which is used to provide a force that causes the first connecting portion and the second connecting portion to move away from each other.

[0030] In this solution, by setting an elastic element, the first and second connecting parts can be automatically reset under the force of the elastic element after being compressed, further ensuring that the baffle can always block the gap between the mounting bracket and the frame.

[0031] Preferably, the elastic element is a spring, which is sleeved on the linkage rod. The two ends of the spring abut against the first connecting part and the second connecting part, respectively, and a spring seat is provided in at least one end of the spring. The spring seat is disposed on the linkage rod.

[0032] In this design, the spring seat constrains the displacement freedom of the elastic element in the height direction, thereby improving the stability of the elastic element.

[0033] Preferably, there are two spring seats, one of which is fixed to the first connecting part and the other of which is fixed to the second connecting part.

[0034] Preferably, the linkage component is disposed between the two ends of the mounting bracket in a second direction, the second direction being the width direction of the vehicle.

[0035] In this solution, the linkage component can utilize the space occupied by the mounting bracket in the second direction. Compared with setting the linkage component on the side of the mounting bracket, this makes the overall layout more compact and saves space. It also reduces the possibility of interference with other structures in the seamless wheelbase adjustment mechanism.

[0036] Preferably, the baffle is disposed between the frame and the extension plate, and the baffle is slidable relative to the frame along the first direction;

[0037] The linkage assembly includes a third connecting part connected to the baffle and a linkage rod. The first end of the linkage rod passes through the third connecting part, and the second end of the linkage rod passes through the mounting bracket and extends into the mounting groove. Both ends of the linkage rod are provided with limiting members, and the third connecting part is located between the two limiting members. The limiting member provided at the second end of the linkage rod is located in the mounting groove. The limiting member is used to prevent the linkage rod from disengaging from the third connecting part and the mounting bracket.

[0038] In this design, the baffle moves with the mounting frame via a linkage assembly. When the mounting frame moves forward a certain distance in the first direction, the baffle abuts against the portion of the frame in front of the mounting frame until it can no longer move forward. At this point, the distance between the third connecting part and the mounting frame continues to decrease, and the second end of the linkage rod extends further into the mounting groove, preventing interference between the baffle and the frame. When the mounting frame moves backward in the first direction, the mounting frame drives the linkage rod backward via a limiting member at the second end of the linkage rod. This, in turn, drives the third connecting part and the baffle backward via a limiting member at its first end. Consequently, the baffle in front of the mounting frame moves backward with the mounting frame, thus achieving the function of the follow-up mechanism blocking the gap between the mounting frame and the frame. In summary, this structure eliminates the need for a separate power mechanism for the follow-up mechanism, reducing costs.

[0039] Preferably, the third connecting part has a third connecting hole, the mounting bracket has a fourth connecting hole, and the two ends of the linkage rod pass through the third connecting hole and the fourth connecting hole respectively. The third connecting hole and the fourth connecting hole are both clearance-fitted with the circumferential outer surface of the linkage rod.

[0040] In this case, by setting a third and a fourth connecting hole that are in clearance fit with the linkage rod, the linkage rod can move more smoothly in the third and fourth connecting holes, ensuring that the follower mechanism can better cover the gap between the mounting bracket and the frame.

[0041] Preferably, the shielding mechanism further includes an elastic element disposed between the third connecting portion and the mounting bracket, which provides a force that causes the third connecting portion and the mounting bracket to move away from each other.

[0042] In this solution, when the distance between the third connecting part and the mounting bracket is close enough that the elastic element is compressed, the baffle presses against the side wall of the frame under the force of the elastic element. As the mounting bracket gradually moves away from the third connecting part, the third connecting part automatically resets under the elastic force provided by the elastic element. That is, the baffle and the mounting bracket gradually move away from each other, thereby further ensuring that the baffle can always block the gap between the mounting bracket and the frame.

[0043] Preferably, the elastic element is a spring, and the spring is sleeved on the linkage rod.

[0044] This design features a simple structure that, when mounted on the linkage rod, requires no other fixing structure and is easy to install.

[0045] Preferably, the linkage assembly further includes a guide portion, which is used to guide the axis of the linkage rod to be parallel to the first direction.

[0046] In this design, the guide section is used to ensure that the axis of the linkage rod is always parallel to the first direction, thereby ensuring that the mounting bracket will not mechanically jam with the linkage rod during the movement of the mounting bracket along the first direction.

[0047] Preferably, the guide portion includes a sleeve, the axial direction of the sleeve is parallel to the first direction, the sleeve is sleeved on the linkage rod, and the circumferential inner surface of the sleeve is clearance-fitted with the circumferential outer surface of the linkage rod.

[0048] In this design, the sleeve structure is simple and provides good guidance for the linkage rod.

[0049] Preferably, the sleeve is mounted on the outer side of the mounting bracket facing the baffle.

[0050] In this design, the sleeve is mounted on the mounting bracket, eliminating the need for a separate support structure for the sleeve, resulting in a more compact overall structure. Furthermore, since it is located on the outer side of the mounting bracket, it does not occupy the internal space of the mounting slot.

[0051] Preferably, the blocking mechanism further includes a limiting sub-mechanism, which is connected to the baffle and is used to limit the range of motion of the baffle along the first direction.

[0052] In this solution, the movement distance of the baffle can be limited by the limiting sub-mechanism, so as to prevent the baffle from extending into the top of the mounting groove after the mounting bracket moves excessively, causing the baffle to come into contact with the wheel.

[0053] Preferably, the limiting sub-mechanism includes a slider connected to the baffle and a slide rail connected to the frame, the slider and the slide rail cooperating with each other, and the slide rail being horizontally arranged on the frame along the first direction;

[0054] The end of the slide rail is provided with a limiting part to prevent the slider from falling off.

[0055] In this design, the baffle is slidably connected to the frame via a slider, which improves the stability of the baffle during movement and prevents the slider from falling off the slide rail through a limiting part.

[0056] Preferably, there are four linkage components and four limiting sub-mechanisms, each corresponding to the other, and the linkage components and limiting sub-mechanisms are located at the four corners of the mounting frame.

[0057] In this design, along the first direction, both sides of the mounting frame are equipped with shielding mechanisms. Each shielding mechanism includes a baffle, two linkage components, and two limiting sub-mechanisms, thereby improving the stability of the baffle operation.

[0058] Preferably, the driving mechanism includes a driving unit and a sliding groove and a roller that cooperate with each other. The roller is rotatably mounted on the wheel bearing mechanism, the sliding groove is fixed on the frame, and the wheel bearing mechanism is mounted on the sliding groove.

[0059] The fixed end of the drive unit is disposed on the frame, and the drive end of the drive unit is disposed on the wheel bearing mechanism.

[0060] In this design, the rollers and slides work together, and a drive unit is used as the actuator to realize the movement of the wheel bearing mechanism relative to the frame in the first direction. This reduces the friction between the wheel bearing mechanism and the frame, making the movement of the wheel bearing mechanism relative to the frame in the first direction smoother and improving the service life of the seamless wheelbase adjustment mechanism.

[0061] Preferably, the mounting bracket has a guide structure at the position corresponding to the slide groove, and the mounting bracket is erected on the slide groove through the guide structure. The guide structure is used to limit the slide groove in a second direction, the second direction being the width direction of the vehicle.

[0062] In this design, the guide structure guides the movement of the mounting frame in the first direction, further improving the stability of the mounting frame during movement.

[0063] Preferably, the guide structure is a through guide hole that passes through the mounting bracket along the first direction, and the mounting bracket is mounted on the slide rail through the guide hole.

[0064] Preferably, the mounting bracket has a through hole, and the through hole extends through the mounting bracket along the first direction;

[0065] The wheel-bearing mechanism also includes an inverted U-shaped mounting bracket, which extends into the through hole and is detachably connected to the mounting bracket. The roller is rotatably mounted on the inverted U-shaped mounting bracket, and the drive unit is located in the opening of the inverted U-shaped mounting bracket.

[0066] In this design, the through hole allows for a relatively higher installation height of the inverted U-shaped mounting bracket, freeing up installation space for the drive unit and preventing fallen leaves and other debris from falling under the mounting bracket.

[0067] Preferably, the drive mechanism further includes a distance detection device disposed at the slide groove, the distance detection device being used to detect the displacement of the wheel bearing mechanism in a first direction.

[0068] In this solution, the displacement of the wheel bearing mechanism is accurately detected by a distance detection device, which improves the accuracy of the detection of the movement position of the wheel bearing mechanism.

[0069] A lift includes a seamless wheelbase adjustment mechanism as described in any of the preceding claims.

[0070] The positive and progressive effects of this invention are as follows:

[0071] In this invention, the follow-up mechanism blocks the gap between the wheel-bearing mechanism and the frame. Therefore, after battery replacement, when the vehicle leaves the lift and passes between the wheel-bearing mechanism and the frame, it will not experience a jerking sensation or get stuck due to running over the gap. This also prevents the two plates forming the gap from fatigue fracture due to long-term wheel impact, improving the user experience. A mounting slot is provided on the mounting bracket to accommodate the wheel positioning mechanism. The wheel positioning mechanism moves as a whole in the first direction, and its positioning accuracy is not affected by the drive mechanism. Blocking the gap between the mounting bracket and the frame can be achieved in three ways: first, through an extension plate that moves with the mounting bracket; second, by using a linkage mechanism to drive the baffle in the first method; and third, by using an elastic element, a first connecting part, a second connecting part, and a linkage rod in the linkage mechanism in the second method. The seamless wheelbase adjustment mechanism of the third method allows for a larger wheelbase adjustment range with the same lift size, thus accommodating more vehicle models. Attached Figure Description

[0072] Figure 1 This is a schematic diagram of the structure of a lifting machine according to an embodiment of the present invention.

[0073] Figure 2 This is a side view of a lifting machine according to an embodiment of the present invention.

[0074] Figure 3 for Figure 2 Enlarged view of part A.

[0075] Figure 4 This is a schematic diagram of a seamless wheelbase adjustment mechanism according to an embodiment of the present invention.

[0076] Figure 5 This is a schematic diagram of a seamless wheelbase adjustment mechanism according to an embodiment of the present invention from another perspective.

[0077] Figure 6 This is a schematic diagram of a seamless wheelbase adjustment mechanism according to an embodiment of the present invention from a low angle.

[0078] Figure 7 This is a schematic diagram of a seamless wheelbase adjustment mechanism according to an embodiment of the present invention from a frontal view.

[0079] Figure 8 This is a schematic diagram of the mounting bracket according to an embodiment of the present invention.

[0080] Figure 9 This is a schematic diagram of the structure of a seamless wheelbase adjustment mechanism according to an embodiment of the present invention.

[0081] Figure 10 This is a schematic diagram of the structure of the linkage component in an embodiment of the present invention.

[0082] Figure 11 This is a bottom view of the linkage component and mounting bracket in an embodiment of the present invention.

[0083] Figure 12 This is a side view of the linkage component and mounting bracket in an embodiment of the present invention.

[0084] Explanation of reference numerals in the attached figures:

[0085] Lift 1, frame 11, end plate 111, clearance opening 112, seamless wheelbase adjustment mechanism 2, wheel bearing mechanism 21, mounting bracket 211, mounting groove 2111, extension plate 2112, guide structure 2113, guide hole 2114, through hole 2115, wheel positioning mechanism 212, inverted U-shaped mounting bracket 213, side wing 2131, drive mechanism 22, drive unit 221, slide 222, roller 223, distance Detection device 224, follower mechanism 23, shielding mechanism 231, baffle 2311, linkage assembly 2312, first connecting part 23121, second connecting part 23122, linkage rod 23123, limiting member 23124, elastic member 23125, spring seat 23126, third connecting part 23127, sleeve 23128, limiting sub-mechanism 232, slider 2321, slide rail 2322, limiting part 23221 Detailed Implementation

[0086] The present invention will be described more clearly and completely below with reference to a preferred embodiment and the accompanying drawings.

[0087]

Example 1

[0088] This embodiment provides a specific implementation of a seamless wheelbase adjustment mechanism 2, applied in a lift 1. After a vehicle enters the battery swapping station, the front wheels of the vehicle rest on the lift 1, while the rear wheels rest on other lifting equipment. The lift 1 and the lifting equipment can cooperate to lift the vehicle. The seamless wheelbase adjustment mechanism 2 is located at the front wheels of the vehicle. By moving forward and backward, the seamless wheelbase adjustment mechanism 2 adapts to vehicles with different wheelbases, meaning it can accommodate different vehicle models. In other embodiments, the seamless wheelbase adjustment mechanism 2 may be located at the rear wheels of the vehicle.

[0089] like Figure 1-3As shown, the lift 1 includes a frame 11, which is composed of several plates and beams. The frame 11 includes four end plates 111, which together form a rectangular frame structure. A seamless wheelbase adjustment mechanism 2 is mounted on the frame 11 and rises and falls together with the frame 11. Two vertically penetrating clearance openings 112 are provided on the frame 11 at the positions corresponding to the vehicle's wheels. Figure 2 The end plate 111 of the frame 11 is hidden to show the seamless wheelbase adjustment mechanism 2.

[0090] like Figure 1-7 As shown, the seamless wheelbase adjustment mechanism 2 includes a wheel bearing mechanism 21, a drive mechanism 22, and two follower mechanisms 23.

[0091] The wheel-bearing mechanism 21, which supports and positions the wheel, is located at the clearance opening 112 and mounted on the frame 11. Specifically, as shown... Figure 4 As shown, the wheel-bearing mechanism 21 includes a mounting bracket 211 and a wheel positioning mechanism 212. The mounting bracket 211 has an upward-facing mounting groove 2111 located at the clearance opening 112, and the mounting groove 2111 is lower than the upper surface of the frame 11. The wheel positioning mechanism 212, used for positioning the wheel in the front-rear direction, is disposed in the mounting groove 2111, and the wheel positioning mechanism 212 moves together with the mounting bracket 211. The fixed end of the drive mechanism 22 is connected to the frame 11, and the free end of the push rod of the drive mechanism 22 is connected to the mounting bracket 211.

[0092] Drive mechanism 22 is used to drive wheel-bearing mechanism 21 to move horizontally along a first direction, the first direction being the length direction of the vehicle. Figure 2 (as indicated by the double-headed arrow in the image), and along this first direction, two follower mechanisms 23 are located at both ends of the wheel-bearing mechanism 21. The follower mechanism 23 is connected to the mounting frame 211 of the wheel-bearing mechanism 21 and moves along the first direction with the wheel-bearing mechanism 21. That is, the mounting frame 211 moves horizontally along the first direction under the drive of the drive mechanism 22. The follower mechanism 23 is used to cover the gap between the mounting frame 211 and the frame 11.

[0093] The wheel-bearing mechanism 21 on the lift 1 supports the two wheels of the vehicle. Before the battery swap, the control system of the battery swapping station controls the drive mechanism 22 to move the wheel-bearing mechanism 21 in the first direction. That is, the parking position of the wheels in the first direction is adaptively adjusted. Thus, the lift 1 can adapt to vehicles with different wheelbases, and the position of the vehicle after wheelbase adjustment is available for the battery swapping equipment to perform the swap. The follow-up mechanism 23 blocks the gap between the wheel-bearing mechanism 21 and the frame 11. After the battery swap is completed, when the vehicle leaves the lift 1 and passes through the gap between the wheel-bearing mechanism 21 and the frame 11, it will not experience a jerking sensation or be stuck due to getting stuck in the gap. Therefore, the two plates forming the gap will not fatigue and break due to long-term impact from the wheels, improving the user experience.

[0094] The wheel alignment mechanism 212 includes two positioning components arranged in a V-shape with their openings facing upwards. Each positioning component includes several rollers spaced apart along the width direction of the vehicle. When the wheel travels to the lift 1, the wheel alignment mechanism 212 positions the wheel, at which point the wheel abuts against the outer surfaces of the rollers of the two positioning components. When the drive mechanism 22 drives the mounting frame 211, it causes the mounting frame 211 to move horizontally, thereby adjusting the wheelbase of the vehicle through the wheel alignment mechanism 212.

[0095] Specifically, the wheel-bearing mechanism 21 is provided with the follower mechanism 23 at both ends along the first direction. This can be understood as the mounting bracket 211 having an extension plate 2112 at both its front and rear ends. In this embodiment, the follower mechanism 23 includes a horizontally arranged extension plate 2112, and the upper surface of the extension plate 2112 is flush with the upper surface of the mounting groove 2111, further reducing the bumps generated when the wheel passes through this area. The extension plate 2112 is used to block the gap between one end of the mounting bracket 211 corresponding to the extension plate 2112 and the frame 11. In this embodiment, the extension plate 2112 is flat. The extension plate 2112 can move together with the mounting bracket 211, thereby blocking the gap between the mounting bracket 211 and the frame 11, preventing the wheel from directly traveling from the mounting groove 2111 onto the frame 11 and causing a jerking sensation, or the wheel from directly traveling from the frame 11 into the mounting groove 2111 and causing a jerking sensation.

[0096]

Example 2

[0097] This embodiment provides a specific implementation of a seamless wheelbase adjustment mechanism 2, which is a further optimization based on embodiment 1. The optimization is described in detail below.

[0098] like Figure 2-4As shown, the follow-up mechanism 23 also includes a blocking mechanism 231. The blocking mechanism 231 includes a baffle 2311 and a linkage component 2312. The baffle 2311 is connected to the mounting frame 211 through the linkage component 2312. That is, the linkage component 2312 is installed on the mounting frame 211, and the baffle 2311 is connected to the linkage component 2312. The baffle 2311 moves with the mounting frame 211 in the first direction and blocks the gap between the frame 11 and the mounting frame 211.

[0099] In the vertical direction, the baffle 2311 is disposed between the frame 11 and the extension plate 2112, and the baffle 2311 can slide relative to the frame 11 along the first direction, that is, the baffle 2311 can slide relative to the frame 11 under the action of the linkage component 2312.

[0100] Specifically, such as Figure 2-6 As shown, the linkage component 2312 includes a first connecting part 23121 connected to the baffle 2311, a second connecting part 23122 connected to the mounting bracket 211, and a linkage rod 23123. The linkage rod 23123 can slide relative to the first connecting part 23121 and the second connecting part 23122. The two ends of the linkage rod 23123 pass through the first connecting part 23121 and the second connecting part 23122 respectively, and both ends of the linkage rod 23123 are provided with limiting members 23124. The first connecting part 23121 and the second connecting part 23122 are located between the two limiting members 23124. The limiting members 23124 are used to prevent the first connecting part 23121 or the second connecting part 23122 from disengaging from the linkage rod 23123. That is, the limiting member 23124 corresponding to the first connecting part 23121 is used to prevent the first connecting part 23121 from disengaging from the linkage rod 23123, and the limiting member 23124 corresponding to the second connecting part 23122 is used to prevent the second connecting part 23122 from disengaging from the linkage rod.

[0101] In this embodiment, the linkage rod 23123 is a rod-shaped structure. The first connecting part 23121 and the second connecting part 23122 are both plate parts. The first connecting part 23121 is fixedly connected to the baffle 2311, and the second connecting part 23122 is fixedly connected to the mounting bracket 211. In other specific embodiments, the first connecting part 23121 and the baffle 2311 can be integrally formed, and the second connecting part 23122 and the mounting bracket 211 can also be integrally formed. This will not be elaborated here.

[0102] Specifically, the first connecting part 23121 has a first connecting hole, the second connecting part 23122 has a second connecting hole, and the two ends of the linkage rod 23123 pass through the first connecting hole and the second connecting hole respectively. The first connecting hole and the second connecting hole are both clearance-fitted with the circumferential outer surface of the linkage rod 23123.

[0103] Furthermore, in order to enable the distance between the baffle 2311 and the mounting bracket 211 to be automatically reset, the blocking mechanism 231 also includes an elastic element 23125. The elastic element 23125 is disposed between the first connecting portion 23121 and the second connecting portion 23122, and is used to provide a force that causes the first connecting portion 23121 and the second connecting portion 23122 to move away from each other.

[0104] Specifically, the elastic element 23125 is a spring, which is sleeved on the linkage rod 23123. The two ends of the spring abut against the first connecting part 23121 and the second connecting part 23122, respectively. Each end of the spring has a spring seat 23126, which is mounted on the linkage rod 23123 and welded to the first connecting part 23121 and the second connecting part 23122. The spring seat 23126 can move relative to the linkage rod 23123 along with the first connecting part 23121 and the second connecting part 23122 connected to it. In this embodiment, the spring is a compression spring, and the spring seat 23126 uses an existing standard component. The spring seat 23126 constrains the displacement freedom of the elastic element 23125 in the height direction, improving the stability of the elastic element 23125.

[0105] In other specific embodiments, only one spring seat 23126 may be provided, and it may be provided on the end face of the first connecting part 23121 or the second connecting part 23122 that abuts against the spring, which can also play a certain limiting role for the spring; the connection form between the spring seat 23126 and the first connecting part 23121 or the second connecting part 23122 is not limited to the welding in this example, but may also be a detachable connection form such as adhesive bonding, bolt connection, or snap-fit ​​connection, which will not be described in detail here.

[0106] By setting the elastic element 23125, the first connecting part 23121 and the second connecting part 23122 can automatically reset under the force of the elastic element 23125 after being compressed, thereby ensuring that the baffle 2311 can always block the gap between the mounting bracket 211 and the frame 11.

[0107] More preferably, in order to further improve the stability of the baffle moving along the first direction and to prevent the baffle from tilting when the wheel runs over it, there are two blocking mechanisms 231 in this embodiment. Along the first direction, the two blocking mechanisms 231 are respectively arranged on both sides of the mounting frame 211, and each blocking mechanism 231 includes a baffle 2311 and two linkage components 2312. Therefore, a total of four linkage components 2312 are located at the four corners of the mounting frame 211.

[0108] Taking the forward movement of the seamless wheelbase adjustment mechanism 2 to adjust the wheelbase as an example, the movement processes of its front-end follower mechanism 23 and rear-end follower mechanism 23 are described respectively:

[0109] For the follower mechanism 23 located at the front end of the mounting bracket 211, when the control drive mechanism 22 drives the mounting bracket 211 forward, the second connecting part 23122 pushes the elastic element 23125 forward, driving the first connecting part 23121 and the baffle 2311 forward. After the mounting bracket 211 reaches the required position, the drive mechanism 22 stops. When the end face of the baffle 2311 abuts against the side of the frame 11, but the mounting bracket 211 has not yet reached the required position, the baffle 2311 and the first connecting part 23121 remain stationary, and the mounting bracket 211 continues to move forward with the drive mechanism 22. The second connecting part 23122 moves toward the first connecting part 23121, and the elastic element 23125 is further compressed.

[0110] For the follower mechanism 23 located at the rear end of the mounting frame 211, when the control drive mechanism 22 drives the mounting frame 211 to move forward, the second connecting part 23122 moves forward with the mounting frame 211. At this time, the baffle 2311 abuts against the side of the frame 11, and the elastic member 23125 is in a compressed state. Then the elastic member 23125 gradually stretches and releases energy until the first connecting part 23121 and the second connecting part 23122 abut against the corresponding limiting member 23124. Then the elastic member 23125, the first connecting part 23121 and the baffle 2311 move forward together with the mounting frame 211.

[0111]

Example 3

[0112] The seamless wheelbase adjustment mechanism 2 in Example 3 is a further optimization based on Example 1. The optimization is described in detail below.

[0113] like Figures 9-12 As shown, in this embodiment, the linkage component 2312 is disposed between the two ends of the mounting bracket 211 in the second direction, wherein the second direction is the width direction of the vehicle. Specifically, as... Figure 9 and Figure 11 As shown, in this embodiment, there are four linkage components 2312, which are respectively located at the four corners of the mounting frame 211. Along the second direction, the four linkage components 2312 are simultaneously located between the two ends of the mounting frame 211, and also along the first direction (the length direction of the vehicle), the four linkage components 2312 are simultaneously located outside the wheel positioning mechanism 212, avoiding interference with the wheel positioning mechanism 212. Therefore, when the mounting frame 211 moves forward or backward along the first direction, the gap between the mounting frame 211 and the frame 11 can be blocked.

[0114] Compared to placing the linkage component 2312 on the side of the mounting bracket 211, the linkage component 2312 in this embodiment can utilize the space occupied by the mounting bracket 211 in the second direction. On the one hand, this makes the overall layout more compact and saves space, and on the other hand, it can reduce the possibility of interference with other structures in the seamless wheelbase adjustment mechanism 2.

[0115] like Figure 10 As shown, baffle 2311 is disposed between frame 11 and extension plate 2112, and baffle 2311 can slide relative to frame 11 along a first direction. Linkage assembly 2312 includes a third connecting part 23127 connected to baffle 2311 and linkage rod 23123. The first end of linkage rod 23123 passes through the third connecting part 23127, and the second end of linkage rod 23123 passes through mounting bracket 211 and extends into mounting groove 2111. Both ends of linkage rod 23123 are provided with limiting members 23124, and the third connecting part 23127 is located between the two limiting members 23124. The limiting member 23124 disposed at the second end of linkage rod 23123 is located in mounting groove 2111. The limiting member 23124 is used to prevent linkage rod 23123 from disengaging from the third connecting part 23127 and mounting bracket 211.

[0116] When the mounting bracket 211 moves forward in the first direction (i.e.) Figure 9 Move to the upper right (i.e., towards) Figure 9 After moving a certain distance to the upper right, the baffle 2311 in front of the mounting bracket 211 will abut against the part of the frame 11 in front of the mounting bracket 211 until the baffle 2311 can no longer move forward. At this time, the distance between the third connecting part 23127 and the mounting bracket 211 continues to approach each other, and the second end of the linkage rod 23123 will further extend into the mounting groove, so that the baffle 2311 and the frame 11 will not interfere. When the mounting bracket 211 moves backward in the first direction (i.e. towards the upper right), Figure 9 When the mounting bracket 211 moves to the lower left, the limiting member at the second end of the linkage rod 23123 drives the linkage rod 23123 to move backward. This causes the linkage rod 23123, through the limiting member 23124 at its first end, to drive the third connecting part 23127 and the baffle 2311 to move backward. Consequently, the baffle 2311 located in front of the mounting bracket 211 moves backward with the mounting bracket 211, thus achieving the function of the follower mechanism blocking the gap between the mounting bracket 211 and the frame 11. In summary, this structure eliminates the need for a separate power mechanism for the follower mechanism, reducing costs.

[0117] Specifically, such as Figure 10 and Figure 11As shown, in this embodiment, the third connecting part 23127 is an ear plate mounted on the baffle 2311. A third connecting hole is provided on the ear plate, and a fourth connecting hole is provided on the side wall of the mounting bracket 211 in the first direction. The first end of the linkage rod 23123 passes through the third connecting hole on the ear plate, and the second end of the linkage rod 23123 passes through the fourth connecting hole of the mounting bracket 211 and extends into the mounting groove 2111. Both the third and fourth connecting holes are clearance-fitted with the circumferential outer surface of the linkage rod 23123 to ensure that the linkage rod 23123 can move smoothly within the third and fourth connecting holes, thereby enabling the mounting bracket 211 to move normally. The follower mechanism can better cover the gap generated between the mounting bracket 211 and the frame 11.

[0118] like Figure 11 and Figure 12 As shown, the blocking mechanism 231 also includes an elastic element 23125, which is disposed between the third connecting portion 23127 and the mounting bracket 211. The elastic element 23125 provides a force that causes the third connecting portion 23127 and the mounting bracket 211 to move away from each other. In this embodiment, when the distance between the third connecting portion 23127 and the mounting bracket 211 is close, causing the elastic element 23125 to be compressed, the baffle presses against the side wall of the frame 11 under the force of the elastic element 23125. As the mounting bracket 211 gradually moves away from the third connecting portion 23127, the third connecting portion 23127 automatically resets under the elastic force provided by the elastic element 23125. That is, the baffle 2311 and the mounting bracket 211 gradually move away from each other, thereby further ensuring that the baffle 2311 can always block the gap between the mounting bracket 211 and the frame 11.

[0119] like Figure 11 and Figure 12 As shown, the elastic element 23125 in this embodiment is a spring, which is sleeved on the linkage rod 23123, thereby fixing the position of the spring without the need for additional structures to fix the spring, resulting in a simple structure. This embodiment uses a shorter spring, meaning that before the mounting bracket is adjusted along the first direction, the length of the spring is less than the distance between the third connecting part and the outer side of the mounting bracket near the third connecting part, thereby further reducing costs.

[0120] In other embodiments, the elastic element 23125 may also be made of other elastic materials such as rubber. Alternatively, a longer spring may be selected, such that both ends of the spring can always abut against the third connecting part 23127 and the mounting bracket 211 respectively, to provide a force that moves the baffle away from the mounting bracket and simultaneously improves the stability of the spring.

[0121] like Figures 10-12As shown, the linkage assembly 2312 also includes a guide portion, which is used to guide the axis of the linkage rod 23123 to be parallel to the first direction, so as to ensure that the axis of the linkage rod 23123 is always parallel to the first direction, thereby ensuring that the mounting bracket 211 will not interfere with the linkage rod 23123 during the movement along the first direction.

[0122] like Figures 10-12 As shown, the guide portion in this embodiment includes a sleeve 23128, which is mounted on the outer side of the mounting bracket 211 facing the baffle 2311. The axial direction of the sleeve 23128 is parallel to the first direction, and the sleeve 23128 is sleeved on the linkage rod 23123. The inner circumferential surface of the sleeve 23128 is clearance-fitted with the outer circumferential surface of the linkage rod 23123.

[0123] The sleeve 23128 is mounted on the mounting bracket 211, so there is no need to set up a separate support structure for the sleeve 23128, making the overall structure more compact. Moreover, it is located on the outer side of the mounting bracket and does not occupy the internal space of the mounting slot.

[0124] In other alternative embodiments, other guiding structures capable of achieving the above functions can also be used to ensure that the axis of the linkage 23123 is always parallel to the first direction, guaranteeing the normal movement of the mounting bracket 211. For example, the sleeve can be mounted on the lower end face of the extension plate 2112 via a support mechanism. When the sleeve 23128 moves synchronously with the mounting bracket 211, the position of the sleeve 23128 should not only avoid interference with other structures during installation, but also avoid interference with other structures during movement.

[0125] In other alternative embodiments, when a longer spring is used, the end of the spring near the mounting bracket 211 can abut against the outer side of the mounting bracket 211 in the first direction or against the side of the sleeve 23128 away from the mounting bracket 211.

[0126] Based on the structure of the linkage component 2312 described above, taking the forward movement of the seamless wheelbase adjustment mechanism 2 to adjust the wheelbase as an example, the movement processes of its front-end follower mechanism and rear-end follower mechanism are described respectively:

[0127] For the follower mechanism located at the front end of the mounting bracket 211, when the control drive mechanism drives the mounting bracket 211 to move forward, the mounting bracket 211 pushes the elastic element 23125 forward, causing the third connecting part 23127 and the baffle 2311 to move forward until the mounting bracket 211 reaches the required position, at which point the drive mechanism stops. When the end face of the baffle 2311 abuts against the side of the frame 11, but the mounting bracket 211 has not yet reached the required position, the baffle 2311 and the third connecting part 23127 remain stationary, and the mounting bracket 211 continues to move forward with the drive mechanism, moving towards the third connecting part 23127, further compressing the elastic element 23125.

[0128] For the follower mechanism located at the rear end of the mounting bracket 211, when the control drive mechanism drives the mounting bracket 211 to move forward, the mounting bracket 211 moves forward. If at this time the baffle 2311 abuts against the side of the frame 11 and the elastic member 23125 is in a compressed state, the elastic member 23125 gradually extends and releases energy until the limiting member 23124 located at the second end of the linkage rod 23123 abuts against the mounting bracket 211, and then the third connecting part 23127 and the baffle 2311 move forward together with the mounting bracket 211.

[0129] The linkage components 2312 in Embodiments 1 and 3 above can also be combined with each other. For example, there are a total of 4 linkage components 2312, of which two linkage components 2312 are the structure shown in Embodiment 2, and the other two linkage components 2312 are the structure shown in Embodiment 3. Other combinations are also possible, which can achieve the same effect. This will not be elaborated here.

[0130]

Example 4

[0131] This embodiment provides a specific implementation of a seamless wheelbase adjustment mechanism 2, which is a further optimization based on embodiment 2 or 3. The optimization is described in detail below.

[0132] like Figure 2-6 As shown, the blocking mechanism 231 also includes a limiting sub-mechanism 232, which is connected to the baffle 2311 and is used to limit the travel range of the baffle 2311 along the first direction. The baffle 2311 is slidably connected to the frame 11 through the limiting sub-mechanism 232, which improves the stability of the baffle 2311 moving in the first direction.

[0133] Specifically, the limiting sub-mechanism 232 includes a slider 2321 connected to the baffle 2311 and a slide rail 2322 connected to the frame 11. The slider 2321 and the slide rail 2322 cooperate with each other. The slide rail 2322 is horizontally arranged on the frame 11 along the first direction. The end of the slide rail 2322 is provided with a limiting part 23221 to prevent the slider 2321 from falling off.

[0134] The slide rail 2322 is rod-shaped, and has several fixing holes spaced apart along its length. The slide rail 2322 is connected to the side end plate 111 of the frame 11 by fasteners at these fixing holes. One end of the slide rail 2322 abuts against the corresponding side end plate 111 of the frame 11, and the other end of the slide rail 2322 protrudes upward to form the limiting part 23221.

[0135] In this embodiment, there are four limiting sub-mechanisms 232, which are located at the four corners of the mounting frame 211. The limiting sub-mechanisms 232 and the linkage components 2312 are arranged in a one-to-one correspondence, that is, the linkage components 2312 and the limiting sub-mechanisms 232 are located at the four corners of the mounting frame 211.

[0136] In other specific implementations, such as Figure 10 and Figure 11 As shown, the slider 2321 is installed on the lower end face of the baffle 2311. The two are connected from top to bottom by detachable connectors such as bolts or screws, which makes the connection between the baffle 2311 and the slider 2321 more convenient and further reduces the width of the seamless shaft length adjustment mechanism 2 in the second direction.

[0137]

Example 5

[0138] This embodiment provides a specific implementation of a seamless wheelbase adjustment mechanism 2, which is a further optimization based on any one of the embodiments 1 to 4. The optimization is described in detail below.

[0139] like Figure 7 As shown, the drive mechanism 22 includes a drive unit 221 and a sliding groove 222 and a roller 223 that cooperate with each other. The roller 223 is rotatably mounted on the wheel support mechanism 21. The sliding groove 222 is fixed on the frame 11, and the wheel support mechanism 21 is mounted on the sliding groove 222. The fixed end of the drive unit 221 is mounted on the frame 11, and the drive end of the drive unit 221 is mounted on the wheel support mechanism 21. The drive end is the free end of the drive rod of the drive unit 221.

[0140] By setting rollers 223 on the wheel bearing mechanism 21 and setting slide grooves 222 on the frame 11, with the rollers 223 and slide grooves 222 cooperating with each other, and using a drive unit 221 as an actuator to realize the movement of the wheel bearing mechanism 21 relative to the frame 11 in the first direction, the friction between the wheel bearing mechanism 21 and the frame 11 is reduced, making the movement of the wheel bearing mechanism 21 relative to the frame 11 in the first direction smoother.

[0141] like Figure 8As shown, a guide structure 2113 is provided on the mounting bracket 211 at a position corresponding to the slide groove 222. The mounting bracket 211 is supported on the slide groove 222 via the guide structure 2113. The guide structure 2113 is used to limit the slide groove 222 in a second direction to prevent the mounting bracket 211 from moving in that second direction, which is the width direction of the vehicle. Specifically, the guide structure 2113 is a through guide hole 2114 that passes through the mounting bracket 211 along the first direction (i.e., the length direction of the vehicle), and the mounting bracket 211 is supported on the slide groove 222 through the guide hole 2114.

[0142] Furthermore, the mounting bracket 211 has a through hole 2115, which extends through the mounting bracket 211 along the first direction. The wheel bearing mechanism 21 also includes an inverted U-shaped mounting bracket 213, part of which extends into the through hole 2115 and is detachably connected to the mounting bracket 211, for example, by bolts and nuts. The roller 223 is rotatably mounted on the inverted U-shaped mounting bracket 213, and the drive unit 221 is located within the opening of the inverted U-shaped mounting bracket 213. The through hole 2115 allows the mounting height of the inverted U-shaped mounting bracket 213 to be relatively increased, providing mounting space for the drive unit 221 in terms of height, and preventing fallen leaves and other debris from falling into the mounting bracket 211 at the through hole 2115.

[0143] In this embodiment, the through hole 2115 and the guide structure 2113 together form a through opening, and the inverted U-shaped mounting bracket 213 and the slide groove 222 are both located in the through opening.

[0144] In this embodiment, the chute 222 is made of channel steel, and the roller 223 is made of tapered wheel. There are two chute 222s and four rollers 223. The opening directions of the two chute 222s are opposite to each other, and the rollers 223 are arranged in pairs. Each group of rollers 223 is located in the same chute 222. The drive unit 221 is a hydraulic cylinder. The hydraulic cylinder can bear a large load and is used as the actuator to drive the wheel bearing mechanism 21 to move, which can accurately control the running accuracy of the wheel bearing mechanism 21.

[0145] Specifically, two rollers 223 are installed on the two side wings 2131 of the inverted U-shaped mounting bracket 213. Correspondingly, a sliding groove 222 is provided next to each of the two side wings 2131 of the inverted U-shaped mounting bracket 213, and the rollers 223 are tactilely connected to the sliding grooves 222.

[0146]

Example 6

[0147] This embodiment provides a specific implementation of a seamless wheelbase adjustment mechanism 2, which is a further optimization based on embodiment 5. The optimization is described in detail below.

[0148] like Figure 7 As shown, a distance detection device 224 is located at the slide groove 222. The distance detection device 224 is used to detect the displacement of the wheel bearing mechanism 21 in the first direction. The distance detection device 224 is mounted on the slide groove 222 and located on one side of the slide groove 222. In this embodiment, the distance detection device 224 is an electronic ruler. The fixed end of the electronic ruler is fixedly mounted on the slide groove 222, and the detection end of the electronic ruler is mounted on the mounting frame 211. When the mounting frame 211 moves, the detection end of the electronic ruler moves accordingly, thereby measuring the displacement of the mounting frame 211.

[0149] The displacement of the mounting bracket 211 is accurately detected by the distance detection device 224, which improves the accuracy of the detection of the movement position of the mounting bracket 211.

[0150] In other specific embodiments, the distance detection device 224 may also be disposed on the frame 11, which will not be described in detail here.

[0151]

Example 7

[0152] like Figure 1 , 2 As shown, a lift 1 employs a seamless wheelbase adjustment mechanism 2 as described in any of the above embodiments.

[0153] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship when the device or component is in normal use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0154] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A seamless wheelbase adjustment mechanism, applied to a lift, the lift comprising a frame, wherein the frame has a through clearance opening at the position corresponding to the vehicle's wheels, characterized in that, The seamless wheelbase adjustment mechanism includes: The wheel-bearing mechanism installed at the clearance opening is used to support the wheel; A drive mechanism is used to drive the wheel-bearing mechanism to move horizontally along a first direction, the first direction being the length direction of the vehicle; A follower mechanism is connected to the wheel-bearing mechanism and moves along the first direction with the wheel-bearing mechanism, while blocking the gap between the wheel-bearing mechanism and the frame. The wheel bearing mechanism includes a mounting frame and a wheel positioning mechanism. The mounting frame has an upward-facing mounting groove, and the wheel positioning mechanism is disposed in the mounting groove. The wheel positioning mechanism is used to position the wheel. The mounting bracket moves horizontally along the first direction under the drive of the drive mechanism; The follower mechanism is used to block the gap between the mounting bracket and the frame; The follow-up mechanism includes an extension plate. Along the first direction, at least one end of the mounting bracket is horizontally provided with the extension plate, which is used to cover the gap between one end of the mounting bracket corresponding to the extension plate and the frame. The upper surface of the extension plate is flush with the upper surface of the mounting groove; The extension plate consists of two pieces, which are horizontally arranged at both ends of the mounting frame along the first direction.

2. The seamless wheelbase adjustment mechanism as described in claim 1, characterized in that: The follow-up mechanism also includes a blocking mechanism, which includes a baffle and a linkage component; The baffle is connected to the mounting frame via the linkage component. The baffle moves with the mounting frame in a first direction and blocks the gap between the frame and the mounting frame.

3. The seamless wheelbase adjustment mechanism as described in claim 2, characterized in that: The baffle is disposed between the frame and the extension plate, and the baffle can slide relative to the frame along the first direction; The linkage assembly includes a first connecting part connected to the baffle, a second connecting part connected to the mounting bracket, and a linkage rod. The two ends of the linkage rod pass through the first connecting part and the second connecting part, respectively, and both ends of the linkage rod are provided with limiting members. The first connecting part and the second connecting part are located between the two limiting members, and the limiting members are used to prevent the first connecting part or the second connecting part from detaching from the linkage rod.

4. The seamless wheelbase adjustment mechanism as described in claim 3, characterized in that: The first connecting part has a first connecting hole, and the second connecting part has a second connecting hole. The two ends of the linkage rod pass through the first connecting hole and the second connecting hole respectively. The first connecting hole and the second connecting hole are both clearance-fitted with the circumferential outer surface of the linkage rod.

5. The seamless wheelbase adjustment mechanism as described in claim 4, characterized in that: The shielding mechanism also includes an elastic element disposed between the first connecting portion and the second connecting portion, which is used to provide a force that causes the first connecting portion and the second connecting portion to move away from each other.

6. The seamless wheelbase adjustment mechanism as described in claim 5, characterized in that: The elastic element is a spring, which is sleeved on the linkage rod. The two ends of the spring abut against the first connecting part and the second connecting part respectively, and a spring seat is provided in at least one end of the spring. The spring seat is disposed on the linkage rod.

7. The seamless wheelbase adjustment mechanism as described in claim 6, characterized in that: There are two spring seats, one of which is fixed to the first connecting part and the other of which is fixed to the second connecting part.

8. The seamless wheelbase adjustment mechanism as described in claim 2, characterized in that: The linkage component is located between the two ends of the mounting bracket in a second direction, which is the width direction of the vehicle.

9. The seamless wheelbase adjustment mechanism as described in claim 8, characterized in that: The baffle is disposed between the frame and the extension plate, and the baffle can slide relative to the frame along the first direction; The linkage assembly includes a third connecting part connected to the baffle and a linkage rod. The first end of the linkage rod passes through the third connecting part, and the second end of the linkage rod passes through the mounting bracket and extends into the mounting groove. Both ends of the linkage rod are provided with limiting members, and the third connecting part is located between the two limiting members. The limiting member provided at the second end of the linkage rod is located in the mounting groove. The limiting member is used to prevent the linkage rod from disengaging from the third connecting part and the mounting bracket.

10. The seamless wheelbase adjustment mechanism as described in claim 9, characterized in that: The third connecting part has a third connecting hole, and the mounting bracket has a fourth connecting hole. The two ends of the linkage rod pass through the third connecting hole and the fourth connecting hole respectively. The third connecting hole and the fourth connecting hole are both clearance-fitted with the circumferential outer surface of the linkage rod.

11. The seamless wheelbase adjustment mechanism as described in claim 9, characterized in that: The shielding mechanism further includes an elastic element disposed between the third connecting portion and the mounting bracket, which provides a force that causes the third connecting portion and the mounting bracket to move away from each other.

12. The seamless wheelbase adjustment mechanism as described in claim 11, characterized in that: The elastic element is a spring, and the spring is sleeved on the linkage rod.

13. The seamless wheelbase adjustment mechanism as described in claim 9, characterized in that: The linkage assembly further includes a guide portion, which is used to guide the axis of the linkage rod to be parallel to the first direction.

14. The seamless wheelbase adjustment mechanism as described in claim 13, characterized in that: The guide portion includes a sleeve, the axis of which is parallel to the first direction. The sleeve is sleeved on the linkage rod, and the inner circumferential surface of the sleeve is clearance-fitted with the outer circumferential surface of the linkage rod.

15. The seamless wheelbase adjustment mechanism as described in claim 14, characterized in that: The sleeve is mounted on the outer side of the mounting bracket facing the baffle.

16. The seamless wheelbase adjustment mechanism as described in any one of claims 2 to 15, characterized in that: The blocking mechanism further includes a limiting sub-mechanism, which is connected to the baffle and is used to limit the range of motion of the baffle along the first direction.

17. The seamless wheelbase adjustment mechanism as described in claim 16, characterized in that: The limiting sub-mechanism includes a slider connected to the baffle and a slide rail connected to the frame. The slider and the slide rail cooperate with each other, and the slide rail is horizontally arranged on the frame along the first direction. The end of the slide rail is provided with a limiting part to prevent the slider from falling off.

18. The seamless wheelbase adjustment mechanism as described in claim 16, characterized in that: There are four linkage components and four limiting sub-mechanisms, and the linkage components and limiting sub-mechanisms are arranged in a one-to-one correspondence, and the linkage components and limiting sub-mechanisms are located at the four corners of the mounting frame.

19. The seamless wheelbase adjustment mechanism as described in claim 1, characterized in that: The drive mechanism includes a drive unit and a sliding groove and a roller that cooperate with each other. The roller is rotatably mounted on the wheel bearing mechanism, the sliding groove is fixed on the frame, and the wheel bearing mechanism is mounted on the sliding groove. The fixed end of the drive unit is disposed on the frame, and the drive end of the drive unit is disposed on the wheel bearing mechanism.

20. The seamless wheelbase adjustment mechanism as described in claim 19, characterized in that: The mounting bracket has a guide structure at the position corresponding to the slide groove. The mounting bracket is erected on the slide groove through the guide structure. The guide structure is used to limit the slide groove in a second direction, which is the width direction of the vehicle.

21. The seamless wheelbase adjustment mechanism as described in claim 20, characterized in that: The guide structure is a through guide hole that passes through the mounting bracket along the first direction, and the mounting bracket is mounted on the slide rail through the guide hole.

22. The seamless wheelbase adjustment mechanism as described in claim 20, characterized in that: The mounting bracket has a through hole, and the through hole extends through the mounting bracket along the first direction; The wheel-bearing mechanism also includes an inverted U-shaped mounting bracket, which extends into the through hole and is detachably connected to the mounting bracket. The roller is rotatably mounted on the inverted U-shaped mounting bracket, and the drive unit is located in the opening of the inverted U-shaped mounting bracket.

23. The seamless wheelbase adjustment mechanism as described in claim 19, characterized in that... ； The drive mechanism also includes a distance detection device disposed at the slide groove, the distance detection device being used to detect the displacement of the wheel bearing mechanism in a first direction.

24. A lifting machine, characterized in that, Includes the seamless wheelbase adjustment mechanism as described in any one of claims 1-23.

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