A swing bridge for a fork truck and a fork truck

Abstract

The utility model provides a swing bridge and fork truck for fork truck, include: drive wheel mechanism, including drive wheel and drive connection frame, drive wheel rotatable installation in drive connection frame on, swing bridge mechanism, its one end with drive connection frame's upper end swing joint, the other end with fork truck car body swing joint, lower swing bridge mechanism, be located below swing bridge mechanism, its one end with drive connection frame's lower end swing joint, middle part with fork truck car body swing joint, auxiliary wheel mechanism, including auxiliary wheel, install below lower swing bridge mechanism other end, first buffer mechanism, set up in lower swing bridge mechanism, its one end with lower swing bridge mechanism fixed connection, the other end with fork truck car body fixed connection, first gap adjusting structure, set up in the connecting place of lower swing bridge mechanism and fork truck car body, second gap adjusting structure, set up in the connecting place of lower swing bridge mechanism and drive connection frame. Realize drive wheel posture stable, effective shock attenuation, reduce abrasion and abnormal sound, simplify assembly and reduce cost.

Description

Technical Field

[0001] This utility model relates to the field of forklift technology, and in particular to a swing axle for a forklift and a forklift. Background Technology

[0002] In the rapid development of the modern logistics industry, forklifts, as indispensable handling and stacking tools, have seen their application scope continuously expand. In particular, stand-on reach trucks and stand-on three-way stacker trucks have experienced a surge in demand for standard pallet stacking operations due to their ability to effectively increase warehouse capacity, ensure operational efficiency, and offer relatively low costs and outstanding cost-effectiveness. The market growth trend is significant. The swing axle assembly, as a core component of these forklifts, shoulders key functions such as travel, steering, load-bearing, and shock absorption. Its performance directly determines the forklift's operational stability, safety, and service life. Therefore, the industry has imposed stringent requirements on it: the structure must be compact to fit the limited installation space of the forklift; operation must possess extremely high stability to ensure safe and reliable operation; the assembly process should be simplified as much as possible to improve production efficiency; the shock absorption effect must be excellent to reduce the impact of bumps on operation and driver fatigue; and it must also possess an extremely long fatigue life to adapt to high-intensity continuous operation.

[0003] However, existing swing bridge assemblies face several problems in practical applications: First, during assembly, the poor guiding properties of shaft parts make assembly difficult due to manufacturing errors, affecting production progress. Second, the unreasonable design of the shock absorption structure results in unsatisfactory shock absorption, affecting not only operational stability but also increasing driver fatigue. Third, the connection between the swing bridge and the vehicle body often uses ordinary bearings or direct fit, lacking an effective lubrication structure, leading to rapid wear of critical parts and shortening the component's lifespan. Fourth, the clearance between the swing bridge and the vehicle body is difficult to control precisely, easily causing forward and backward movement, resulting in abnormal noise and affecting the overall user experience. Fifth, to avoid these problems, it is often necessary to improve the manufacturing precision of parts, which undoubtedly increases manufacturing costs and is detrimental to the product's market competitiveness.

[0004] These issues collectively hinder the overall performance improvement of forklifts, making it difficult to meet the industry's high-specification requirements for swing axle components. Utility Model Content

[0005] To address all or part of the problems of the prior art, this utility model provides a swing bridge for forklifts. Through the upper and lower swing bridge mechanisms forming a multi-link support structure, the first buffer mechanism achieving elastic buffering, the first and second clearance adjustment structures optimizing the matching clearance, and the drive wheel and auxiliary wheel providing coordinated support, the model achieves stable drive wheel posture, effective shock absorption, reduced wear and noise, simplified assembly, and reduced costs, meeting the industry's high-specification requirements for swing bridge components.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A swing axle for a forklift, comprising:

[0008] A drive wheel mechanism includes a drive wheel and a drive connecting frame, wherein the drive wheel is rotatably mounted on the drive connecting frame;

[0009] The upper swing bridge mechanism has one end movably connected to the upper end of the drive connecting frame, and the other end movably connected to the forklift body.

[0010] The lower swing bridge mechanism is located below the upper swing bridge mechanism. One end of the lower swing bridge mechanism is movably connected to the lower end of the drive connecting frame, and the middle part is movably connected to the forklift body.

[0011] An auxiliary wheel mechanism, including an auxiliary wheel, is installed below the other end of the lower swing bridge mechanism;

[0012] The first buffer mechanism is disposed on the lower swing bridge mechanism, with one end fixedly connected to the lower swing bridge mechanism and the other end fixedly connected to the forklift body;

[0013] The first gap adjustment structure is located at the connection between the lower swing bridge mechanism and the forklift body;

[0014] The second gap adjustment structure is located at the connection between the lower swing bridge mechanism and the drive connecting frame.

[0015] The upper swing bridge mechanism includes an H-shaped mounting bracket, which includes two opposing first side arms and a first cross arm connecting the two. Both ends of the first side arms have through holes, one end of which is hinged to the upper end of the drive connecting frame through a first pin, and the other end is hinged to the forklift body through a second pin.

[0016] The lower swing bridge mechanism includes two opposing second side arms. One end of each second side arm has a corresponding through hole and is hinged to the lower end of the drive connecting frame via a third pin. The middle part of each second side arm has a corresponding through hole and is hinged to the forklift body via a fourth pin.

[0017] The first, second, third, and fourth pins are all stepped shafts, each consisting of a thick shaft section and a thin shaft section, with a long guide angle at the connection point. Each pin hinge is equipped with a flanged bearing, the outer ring of which has an annular oil groove, and the inner ring has a spiral oil groove extending axially. A communicating oil groove hole is provided between the outer and inner ring oil grooves. A grease nipple is provided at the corresponding shaft hole of the flanged bearing.

[0018] The first buffer mechanism is disposed between the two second side arms near the third pin shaft; the first buffer mechanism includes a connecting plate, two compression springs, a spring baffle, a clamping bolt, and a lock nut; the connecting plate is fixed between the two second side arms, and its surface is provided with two first guide posts; the bottom end of the compression spring is sleeved on the first guide post, and the top end is connected to the spring baffle; the lower end of the clamping bolt abuts against the upper surface of the spring baffle, the upper end is threaded to the forklift body, and is locked by the lock nut.

[0019] The upper surface of the compression spring baffle is provided with a guide groove, the lower end of the clamping bolt is adapted to the guide groove, the lower surface is provided with a second guide post, and the top end of the compression spring is sleeved on the second guide post; the two sides of the compression spring baffle are provided with downwardly extending flanges.

[0020] Each second side arm has at least one limiting connector on its upper surface that connects to the forklift body; the first clearance adjustment structure is provided at the connection between the fourth pin and the second side arm; the second clearance adjustment structure is provided at the connection between the third pin and the drive connecting frame, located on the inner side of the second side arm.

[0021] The auxiliary wheel mechanism further includes an auxiliary wheel mounting bracket, the auxiliary wheel being rotatably mounted on the bottom of the auxiliary wheel mounting bracket, and the top of the auxiliary wheel mounting bracket being mounted on the other end of the second side arm away from the drive connecting bracket.

[0022] An upper plate is provided between the top of the second side arm above the auxiliary wheel mounting bracket. The auxiliary wheel mounting bracket and the upper plate are connected by a connector and have an adjustable gap. A second buffer mechanism is provided between the auxiliary wheel mounting bracket and the upper plate. The second buffer mechanism is at least one shock-absorbing spring in a pre-tightened state.

[0023] This utility model also provides a forklift, including the aforementioned swing axle and a forklift body; a fixing frame is provided on the forklift body, the fixing frame including a main board and a vertical plate, the main board being fixedly connected to the forklift body, and the vertical plate being vertically connected to the main board; the upper surface of the main board is provided with a limit connector mounting hole and a first adjusting shim mounting hole, and the lower surface of the main board is provided with a fourth pin mounting hole; the vertical plate is provided with a clamping bolt mounting hole and a second pin mounting hole. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the specific embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a swing bridge for a forklift according to Embodiment 1 of this utility model.

[0026] Figure 2 This is a side view of a swing bridge for a forklift according to Embodiment 1 of this utility model.

[0027] Figure 3 This invention provides a swing bridge for a forklift according to Embodiment 1 of the present invention. Figure 2 Cross-sectional view at point BB.

[0028] Figure 4 This invention provides a swing bridge for a forklift according to Embodiment 1 of the present invention. Figure 2 Cross-sectional view at point AA.

[0029] Figure 5 This invention provides a swing bridge for a forklift according to Embodiment 1 of the present invention. Figure 4 A schematic diagram of the structure of a flanged bearing.

[0030] Figure 6 This invention provides a swing bridge for a forklift according to Embodiment 1 of the present invention. Figure 4 A schematic diagram of the structure of the fourth pin.

[0031] Figure 7 This is a schematic diagram of a forklift equipped with the swing bridge described in Embodiment 1, which is a second embodiment of the present invention.

[0032] Figure 8 This is a schematic diagram of the structure of a forklift without the swing bridge described in embodiment 1, which is shown in embodiment 2 of this utility model.

[0033] Reference numerals: 1. Drive wheel mechanism; 101. Drive wheel; 102. Drive connecting frame; 103. Drive box; 2. Upper swing bridge mechanism; 201. First side arm; 202. First cross arm; 203. First pin; 204. Second pin; 3. Lower swing bridge mechanism; 301. Second side arm; 302. Third pin; 303. Fourth pin; 3031. Flanged bearing; 3032. Grease nipple; 304. Limiting connector; 305. Upper plate; 4. Auxiliary wheel mechanism; 401. Auxiliary wheel; 402. Auxiliary wheel mounting frame; 5. First buffer mechanism; 5 01. Connecting plate; 502. Compression spring; 503. Compression spring baffle; 504. Clamping bolt; 505. Anti-loosening nut; 506. First guide post; 507. Guide groove; 508. Second guide post; 6. First gap adjustment structure; 7. Second gap adjustment structure; 8. Second buffer mechanism; 9. Forklift body; 901. Main board; 9011. Limiting connector mounting hole; 9012. First adjusting shim mounting hole; 9013. Fourth pin mounting hole; 902. Vertical plate; 9021. Clamping bolt mounting hole; 9022. Second pin mounting hole. Detailed Implementation

[0034] The technical solutions in specific embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] Example 1

[0036] In this embodiment of the utility model, in conjunction with reference to the reference Figures 1 to 8As shown, a swing bridge for a forklift is provided, comprising: a drive wheel mechanism 1, which includes a drive wheel 101, a drive connecting frame 102, and a drive housing 103; one end of the drive housing 103 is tractively connected to the drive wheel 101 to drive its rotation, and the other end is fixedly connected to the drive connecting frame 102, thereby rotatably mounting the drive wheel 101 onto the drive connecting frame 102 via the drive housing 103. An upper swing bridge mechanism 2, one end of which is movably connected to the upper end of the drive connecting frame 102, and the other end of which is movably connected to the forklift body 9. A lower swing bridge mechanism 3, located below the upper swing bridge mechanism 2, one end of which is movably connected to the lower end of the drive connecting frame 102, and the middle part of which is movably connected to the forklift body 9. An auxiliary wheel mechanism 4, including an auxiliary wheel 401, which is mounted below the other end of the lower swing bridge mechanism 3. A first buffer mechanism 5, disposed on the lower swing bridge mechanism 3, one end of which is fixedly connected to the lower swing bridge mechanism 3, and the other end of which is fixedly connected to the forklift body 9. The first clearance adjustment structure 6 is located at the connection between the lower swing bridge mechanism 3 and the forklift body 9. The second clearance adjustment structure 7 is located at the connection between the lower swing bridge mechanism 3 and the drive connecting frame 102.

[0037] Specifically, the upper swing bridge mechanism 2 includes an H-shaped mounting bracket, which consists of two opposing first side arms 201 and a first cross arm 202 connecting the two. Both ends of the first side arm 201 have through holes. One end is hinged to the upper end of the drive connecting frame 102 via a first pin 203, and the other end is hinged to the forklift body 9 via a second pin 204. The first cross arm 202 consists of a tension bolt and a locking nut. The locking nuts on both sides have opposite threads. The tension bolt passes through both first side arms 201. By adjusting the tension bolt and locking nut, the inner gap between the two first side arms 201 can be locked, ensuring that the upper swing bridge mechanism 2 is tightly fitted to the drive connecting plate 501 and the outer positioning surface of the forklift body 9, effectively preventing the left-side drive component from shifting during operation.

[0038] The lower swing bridge mechanism 3 includes two opposing second side arms 301. One end of each second side arm 301 has a corresponding through hole and is hinged to the lower end of the drive connecting frame 102 via a third pin 302. The middle part of each second side arm 301 has a corresponding through hole and is hinged to the forklift body 9 via a fourth pin 303. The hinge points of the first pin 203 and the upper end of the drive connecting frame 102, the second pin 204 and the forklift body 9, the third pin 302 and the lower end of the drive connecting frame 102, and the fourth pin 303 and the forklift body 9, together form a parallel four-bar linkage. This mechanism ensures that the drive wheel 101 always maintains a vertical contact with the ground, regardless of how the swing bridge swings during vehicle operation. This avoids uneven force distribution caused by the tilting of the drive wheel 101. At the same time, it allows the swing bridge to swing flexibly in the vertical direction around the forklift body 9, ensuring that both the drive wheel 101 and the auxiliary wheel 401 are in contact with the ground in real time when the vehicle is in motion, effectively preventing slippage caused by the drive wheel 101 being suspended in the air.

[0039] The first pin 203, the second pin 204, the third pin 302, and the fourth pin 303 all adopt a stepped shaft structure. The stepped shaft includes a thick shaft section and a thin shaft section, and the connection between the two is provided with a long guide angle. This long guide angle design provides excellent guidance during the assembly process, and even with certain manufacturing errors, assembly can be completed smoothly, significantly improving assembly efficiency and convenience.

[0040] Each pin and its corresponding hinge joint is fitted with a flanged bearing 3031. The outer ring of the flanged bearing 3031 has an annular oil groove, and the inner ring has a spiral oil groove extending axially. An oil groove hole connects the outer and inner ring oil grooves. A grease nipple 3032 is provided at the position corresponding to the shaft hole of the flanged bearing 3031. During use, lubricating oil can be added to the oil groove of the flanged bearing 3031 through the grease nipple 3032. The grease injected from the outer ring grease nipple 3032 passes through the outer ring oil groove, the oil groove hole, and the inner ring spiral oil groove, smoothly reaching the mating surface between the shaft and the flanged bearing 3031. This achieves sufficient and long-lasting lubrication of the mating surface, providing excellent lubrication and significantly extending the service life of the flanged bearing 3031.

[0041] A first clearance adjustment structure 6 is provided at the connection between the fourth pin 303 and the second side arm 301. A second clearance adjustment structure 7 is provided at the connection between the third pin 302 and the drive connecting frame 102, located inside the second side arm 301. Both the first clearance adjustment structure 6 and the second clearance adjustment structure 7 use adjusting shims. By selecting combinations of adjusting shims of different thicknesses, the fit clearance caused by manufacturing errors can be effectively compensated, preventing the swing axle from surging and making abnormal noises during operation. At the same time, the use of adjusting shims reduces the manufacturing precision requirements of the above-mentioned fit parts, which is beneficial to controlling manufacturing costs.

[0042] The first buffer mechanism 5 is located between the two second side arms 301 near the third pin 302. It includes a connecting plate 501, two compression springs 502, a spring retainer 503, a clamping bolt 504, and a locking nut 505. The connecting plate 501 is fixedly installed between the two second side arms 301, and its upper surface is provided with two first guide posts 506. The bottom end of the compression spring 502 is sleeved on the first guide post 506, and its top end is connected to the spring retainer 503. The lower end of the clamping bolt 504 abuts against the upper surface of the spring retainer 503, and its upper end is threadedly connected to the forklift body 9 and locked in place by the locking nut 505. The first guide posts 506 on the connecting plate 501 provide stable guidance for the compression spring 502, ensuring that the lower end of the compression spring 502 fits against the plane of the lower swing bridge mechanism 3, preventing the compression spring 502 from bending, deforming, or popping out due to unstable force.

[0043] The upper surface of the compression spring baffle 503 has a guide groove 507, and the lower end of the clamping bolt 504 is fitted into the guide groove 507. The lower surface of the compression spring baffle 503 has a second guide post 508, and the top end of the compression spring 502 is sleeved on the second guide post 508. The two sides of the compression spring baffle 503 have downwardly extending flanges. The guide groove 507 at the upper end of the compression spring baffle 503 can ensure the stability of the clamping bolt 504 under force, while the second guide post 508 at the lower end and the flanges on both sides ensure the stability of the compression spring baffle 503 when it is engaged with the upper part of the compression spring 502, and further effectively prevent the compression spring 502 from bending or popping out during the force process. The clamping bolt 504 presses against the spring baffle 503, which in turn presses against the upper end of the compression spring 502. The lower end of the compression spring 502 presses against the lower swing bridge mechanism 3 via the connecting plate 501, thereby achieving force transmission from the forklift body 9 to the left drive wheel 101 of the swing bridge. The first buffer mechanism 5 is arranged vertically. The compression spring 502 applies a load to the drive wheel 101 downwards, and the compression of the spring can be adjusted by rotating the clamping bolt 504, thus changing the magnitude of the applied force. The first buffer mechanism 5 uses two sets of compression springs 502, which not only has excellent buffering and damping effects but also makes the force applied to the lower swing bridge mechanism 3 relatively evenly distributed. It should be noted that the setting position of the first buffer mechanism 5 in this embodiment is only a preferred option, and it can also be arranged at any suitable position between the third pin 302 and the fourth pin 303.

[0044] Each second side arm 301 has at least one limiting connector 304 on its upper surface that connects to the forklift body 9. In this embodiment, a limiting screw is specifically used. By adjusting the tightening depth of the limiting screw, the gap between it and the second side arm 301 is controlled, thereby effectively limiting the maximum swing amplitude of the swing bridge. This ensures that the vehicle will not be at risk of overturning due to excessive swing of the swing bridge under complex road conditions, thus improving driving safety.

[0045] The auxiliary wheel mechanism 4 also includes an auxiliary wheel mounting bracket 402. The auxiliary wheel 401 is rotatably mounted on the bottom of the auxiliary wheel mounting bracket 402, and the top of the auxiliary wheel mounting bracket 402 is mounted on the other end of the second side arm 301 away from the drive connecting bracket 102. An upper plate 305 is provided between the tops of the two second side arms 301 above the auxiliary wheel mounting bracket 402. The auxiliary wheel mounting bracket 402 and the upper plate 305 are connected by a connector and an adjustable gap is left between them. A second buffer mechanism 8 is provided between the auxiliary wheel mounting bracket 402 and the upper plate 305. The second buffer mechanism 8 is at least one damping spring in a pre-tightened state, which works in conjunction with the first buffer mechanism 5 to further improve the overall damping and buffering effect of the swing bridge.

[0046] Example 2

[0047] This utility model embodiment also provides a forklift, which includes the swing axle and forklift body 9 of embodiment 1 above. The forklift body 9 is provided with a fixing frame, which includes a main board 901 and a vertical plate 902. The main board 901 is fixedly connected to the forklift body 9, and the vertical plate 902 is vertically connected to the main board 901.

[0048] The upper surface of the main board 901 has a limit connector mounting hole 9011 and a first adjusting shim mounting hole 9012, and the lower surface has a fourth pin mounting hole 9013. The upright plate 902 has a clamping bolt mounting hole 9021 and a second pin mounting hole 9022.

[0049] The clamping bolt mounting hole 9021 is a threaded hole, forming a threaded engagement with the clamping bolt 504. Its vertical position can be adjusted by rotating the clamping bolt 504. The second pin mounting hole 9022 is a stepped hole for assembling the second pin 204. The fourth pin mounting hole 9013 is also a stepped hole for assembling the fourth pin 303. During assembly, the larger portion of the stepped hole can first form a guiding engagement with the thinner portion of the stepped shaft, significantly reducing assembly difficulty and making the assembly process more convenient and efficient. The limit connector mounting hole 9011 is a threaded hole for assembling the limit connector 304. Its vertical position can be adjusted by rotating the limit connector 304. The first adjusting shim mounting hole 9012 is used to assemble the first adjusting shim, making the gap adjustment operation more convenient.

[0050] The mounting bracket is manufactured separately and then welded to the vehicle body. This process effectively ensures the dimensional accuracy of the parts of the mounting bracket that connect to the swing bridge, thereby ensuring the precision of the assembly of the swing bridge and the vehicle body and the reliability of the connection.

[0051] It should be noted that, for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the scope of protection of the claims of this utility model.

Claims

1. A swing axle for a forklift, characterized in that, include: The drive wheel mechanism (1) includes a drive wheel (101) and a drive connecting frame (102), wherein the drive wheel (101) is rotatably mounted on the drive connecting frame (102); The upper swing bridge mechanism (2) is movably connected at one end to the upper end of the drive connecting frame (102) and at the other end to the forklift body (9); The lower swing bridge mechanism (3) is located below the upper swing bridge mechanism (2), with one end movably connected to the lower end of the drive connecting frame (102) and the middle part movably connected to the forklift body (9). An auxiliary wheel mechanism (4) includes an auxiliary wheel (401) installed below the other end of the lower swing bridge mechanism (3); The first buffer mechanism (5) is set on the lower swing bridge mechanism (3), with one end fixedly connected to the lower swing bridge mechanism (3) and the other end fixedly connected to the forklift body (9); The first gap adjustment structure (6) is located at the connection between the lower swing bridge mechanism (3) and the forklift body (9); The second gap adjustment structure (7) is located at the connection between the lower swing bridge mechanism (3) and the drive connecting frame (102).

2. The swing bridge according to claim 1, characterized in that, The upper swing bridge mechanism (2) includes an H-shaped mounting bracket. The H-shaped mounting bracket includes two opposing first side arms (201) and a first cross arm (202) connected between the two. Both ends of the first side arms (201) are provided with through holes. One end of the first side arm (201) is hinged to the upper end of the drive connecting frame (102) through a first pin (203), and the other end is hinged to the forklift body (9) through a second pin (204).

3. The swing bridge according to claim 2, characterized in that, The lower swing bridge mechanism (3) includes two opposing second side arms (301). One end of the second side arm (301) is provided with a through hole and is hinged to the lower end of the drive connecting frame (102) through a third pin (302). The middle part of the second side arm (301) is provided with a through hole and is hinged to the forklift body (9) through a fourth pin (303).

4. The swing bridge according to claim 3, characterized in that, The first pin (203), the second pin (204), the third pin (302), and the fourth pin (303) are all stepped shafts. The stepped shaft includes a thick shaft section and a thin shaft section, and a long guide angle is provided at the connection between the two. Each pin hinge is provided with a flanged bearing (3031). The outer ring of the flanged bearing (3031) is provided with an annular oil groove, and the inner ring is provided with a spiral oil groove extending along the axial direction. There is a communicating oil groove hole between the outer ring oil groove and the inner ring oil groove. The flanged bearing (3031) is provided with a grease nipple (3032) at the corresponding shaft hole.

5. The swing bridge according to claim 3, characterized in that, The first buffer mechanism (5) is disposed between the two second side arms (301) near the third pin (302); the first buffer mechanism (5) includes a connecting plate (501), two compression springs (502), a spring baffle (503), a clamping bolt (504), and a locking nut (505); the connecting plate (501) is fixed between the two second side arms (301), and its surface is provided with two first guide posts (506); the bottom end of the compression spring (502) is sleeved on the first guide post (506), and the top end is connected to the spring baffle (503); the lower end of the clamping bolt (504) abuts against the upper surface of the spring baffle (503), the upper end is threaded to the forklift body (9), and is locked by the locking nut (505).

6. The swing bridge according to claim 5, characterized in that, The upper surface of the compression spring baffle (503) is provided with a guide groove (507), the lower end of the clamping bolt (504) is adapted to the guide groove (507), the lower surface is provided with a second guide post (508), and the top end of the compression spring (502) is sleeved on the second guide post (508); the two sides of the compression spring baffle (503) are provided with downwardly extending flanges.

7. The swing bridge according to claim 3, characterized in that, Each of the second side arms (301) has at least one limiting connector (304) on its upper surface that is connected to the forklift body (9); the first clearance adjustment structure (6) is provided at the connection between the fourth pin (303) and the second side arm (301); the second clearance adjustment structure (7) is provided at the connection between the third pin (302) and the drive connecting frame (102) on the inner side of the second side arm (301).

8. The swing bridge according to claim 3, characterized in that, The auxiliary wheel mechanism (4) further includes an auxiliary wheel mounting bracket (402), the auxiliary wheel (401) is rotatably mounted on the bottom of the auxiliary wheel mounting bracket (402), and the top of the auxiliary wheel mounting bracket (402) is mounted on the other end of the second side arm (301) away from the drive connecting bracket (102).

9. The swing bridge according to claim 8, characterized in that, An upper plate (305) is provided between the top of the second side arm (301) above the auxiliary wheel mounting bracket (402). The auxiliary wheel mounting bracket (402) and the upper plate (305) are connected by a connector and have an adjustable gap. A second buffer mechanism (8) is provided between the auxiliary wheel mounting bracket (402) and the upper plate (305). The second buffer mechanism (8) is at least one shock-absorbing spring in a pre-tightened state.

10. A forklift, characterized in that, The swing bridge, including any one of claims 1-9, further includes a forklift body (9); a fixing frame is provided on the forklift body (9), the fixing frame includes a main board (901) and a vertical plate (902), the main board (901) is fixedly connected to the forklift body (9), and the vertical plate (902) is vertically connected to the main board (901); the upper surface of the main board (901) is provided with a limiting connector mounting hole (9011) and a first adjusting shim mounting hole (9012), and the lower surface of the main board (901) is provided with a fourth pin mounting hole (9013); the vertical plate (902) is provided with a clamping bolt mounting hole (9021) and a second pin mounting hole (9022).

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