An assembled frame structure and a crane

Abstract

The application discloses an assembled vehicle frame structure and a crane, which comprises a box-type vehicle frame body, wherein the box-type vehicle frame body comprises a front section of the vehicle frame, a rear section of the vehicle frame and a middle section of the vehicle frame; the front section of the vehicle frame is provided with a first end and a second end arranged oppositely; the rear section of the vehicle frame is provided with a first end and a second end arranged oppositely; the middle section of the vehicle frame is located between the second end of the front section of the vehicle frame and the first end of the rear section of the vehicle frame, and the front section of the vehicle frame, the middle section of the vehicle frame and the rear section of the vehicle frame are sequentially arranged and connected in a head-to-tail mode; the middle section of the vehicle frame is connected with the front section of the vehicle frame or the rear section of the vehicle frame through a sleeve connecting assembly; the sleeve connecting assembly comprises a pipe shaft and a sleeve; a T-shaped threaded adjusting assembly is arranged on the sleeve connecting assembly and located at the pipe shaft insertion end; the T-shaped threaded adjusting assembly is used for adjusting the axial gap between the middle section of the vehicle frame and the front section of the vehicle frame or the rear section of the vehicle frame through axial displacement generated by mutual rotation. The structure connects the front and rear of the vehicle frame into a whole body, allows the tail of the vehicle frame to be locally twisted and buffers the displacement difference between the left and right sides of the vehicle.

Description

Technical Field

[0001] The present invention belongs to the technical field of cranes, and in particular relates to an assembled frame structure and a crane. Background Art

[0002] A wheeled crane primarily consists of a boom, turntable, and specialized chassis. The frame and outriggers are the primary load-bearing components of the chassis. The chassis is interconnected through tires, axles, suspension cylinders, the frame, and the powertrain. The engine provides power for normal operation. During operation, the resistance exerted on the tires is transmitted to the frame through the axles, suspension cylinders, and their supports, ensuring smooth travel.

[0003] As an engineering vehicle, cranes often encounter extremely harsh road conditions during transfer, especially in mountainous and hilly areas, where the roads are bumpy and the road surface is soft. Under such road conditions, the vehicle is abnormally bumpy. For all-terrain cranes, the extension and retraction of the suspension cylinder can ensure that the vehicle tires are in full contact with the ground to a certain extent, reduce the risk of vehicle rollover, and ensure the stability of the vehicle's driving.

[0004] However, the lifting and lowering stroke of the suspension cylinder is typically limited. In extremely rough and harsh road conditions, or for cranes with very large tonnage, the frame is often long and subject to deformation. During cornering, the suspension cylinder stroke sometimes cannot ensure full contact between all tires. This can result in one tire on the ground while the other tire is partially suspended. This can lead to severely uneven stress on the suspension cylinder supports, the frame, and even the axle. This extreme stress imbalance doubles the risk of frame cracking or twisting, and the probability of axle damage is also significantly higher, impacting the vehicle's lifespan and posing a risk to safe operation. Therefore, it is crucial to develop a new frame structure that compensates for the insufficient suspension cylinder length and allows for partial rotation of the frame around an axis parallel to the vehicle's forward direction, ensuring full tire contact with the ground. This balances the axle load, improves the stress on the frame and axle, and enhances vehicle safety and reliability.

[0005] At present, the crane frame is a rigid body, which is basically divided into two structural forms, such as Figure 1 、 Figure 2 shown. Figure 1 The frame structure is divided into four parts: the front section of the frame, the front fixed legs, the rear section of the frame and the rear fixed legs; Figure 2 The frame structure is divided into four parts: the front section of the frame, the main body of the frame, the frame seat and the rear section of the frame. Figure 1 The structure shown is usually used for models with shorter bodies and fewer axles. Figure 2 The frame structure shown is usually used for models with longer bodies and more axles. Figure 1 and Figure 2Both vehicle frame structures are integrally welded. The frame is a rigid body, and the vehicle's main method of buffering uneven road surfaces is to raise and lower the suspension cylinder, which cannot achieve localized left and right torsional rotation of the vehicle or compensate for left and right displacement of the vehicle.

[0006] like Figure 3 As shown, in current structures, the vehicle frame is a monolithic rigid structure, with the suspension cylinder supports welded to the main frame as a single unit. Displacement impacts from road surface unevenness are primarily transmitted through the axles to the suspension cylinders, where they are buffered by the cylinders' extension and contraction. This complex alternating load and displacement differential is ultimately transmitted to the main frame via the suspension cylinder supports. In severely uneven road conditions, even when the suspension cylinders reach their maximum stroke, the height differential cannot be compensated, resulting in partially suspended tires and unevenly distributed vehicle loads across the axles and suspension cylinders. This leads to significant uneven forces between the suspension cylinder supports, the frame, and the axles, with forces on some suspension cylinder supports doubling and local bridge loads increasing dramatically. This places high demands on the reliability of the frame and axles. This is especially true for ultra-large cranes, which have long bodies and potentially torsional deformation. Longitudinal maneuverability requires greater elastic displacement compensation to ensure a more impact-friendly load response. Suspension cylinder travel alone often makes it difficult to compensate for this displacement differential, posing a significant threat to the reliability of the axles and frame.

[0007] For the crane industry, the patents using assembled frame structures include CN111891939 B and CN202310009206.X, such as Figure 4 As shown, this patent only uses the rear fixed legs as an articulated assembly structure, which can reduce the length and weight of the vehicle in the driving state to a certain extent. For the assembled frames in the crane industry, only the rear fixed legs are designed to be detachable. While this is more conducive to reducing the length and weight of the vehicle, it is ineffective in mitigating the difference in ground displacement between the left and right sides, and still cannot solve the problem of local axle load imbalance. Summary of the Invention

[0008] In response to the shortcomings of the existing technology, the present invention provides an assembled frame structure and a crane. This structure connects the front and rear frames into a whole after assembly, allowing local torsion of the rear frame, which is beneficial for buffering the displacement difference between the left and right sides of the vehicle, while providing sufficient axial force for the assembled frame at the rear of the vehicle. In addition, the structure is compact, which reduces the difficulty of arranging related components such as the power system, hydraulic system, and electrical system.

[0009] The technical solution provided by the present invention is as follows:

[0010] The present invention provides an assembled frame structure, including a box-type frame body, wherein the box-type frame body includes: a frame front section, the frame front section has a first end and a second end arranged opposite to each other; a frame rear section, the frame rear section has a first end and a second end arranged opposite to each other; a frame middle section, the frame middle section is located between the second end of the frame front section and the first end of the frame rear section, the frame front section, the frame middle section and the frame rear section are arranged in sequence and connected end to end; the frame middle section is connected to the frame front section or the frame rear section through a sleeve connection assembly, the sleeve connection assembly includes a pipe shaft and a sleeve, and the sleeve connection assembly is provided with a T-type thread adjustment assembly located at the insertion end of the pipe shaft, and the T-type thread adjustment assembly generates axial displacement by mutual rotation to adjust the axial gap between the frame middle section and the frame front section or the frame rear section.

[0011] Furthermore, a frame seat ring is provided on the middle section of the frame, and the frame seat ring extends a tube shaft toward the rear section of the frame, and the rear section of the frame is sunken into a sleeve toward the second end. The T-type thread adjustment assembly includes an annular baffle with an external thread provided at the insertion end of the tube shaft and an annular locking plate with an internal thread cooperating with the annular baffle. The inner and outer diameters of the annular baffle are the same as the inner and outer diameters of the tube shaft and the sleeve leaks out toward the second end of the rear section of the frame. The inner diameter of the annular locking plate is larger than the inner diameter of the sleeve and the outer diameter is less than or equal to the outer diameter of the sleeve.

[0012] Furthermore, it also includes a thrust ring, which covers the annular baffle and the annular locking plate. The thrust ring is fixed to the annular baffle in the direction of the inner diameter, and a gap is provided between the thrust ring and the annular locking plate in the direction of the outer diameter.

[0013] Furthermore, a shaft shoulder is provided at one end of the tubular shaft close to the frame seat ring.

[0014] Furthermore, the distance between the frame seat ring and the rear section of the frame is equal to the length of the axle shoulder.

[0015] Furthermore, a shaft is provided on the shaft, and the sleeve has a first end and a second end arranged opposite to each other. The sleeve is arranged corresponding to the first end and the second end of the sleeve. The sleeve located at the first end of the sleeve contacts the shaft shoulder when the shaft and the sleeve are assembled, and there is a gap between the two sleeves.

[0016] Furthermore, the distance between the inner and outer diameters of the tube shaft is greater than the distance between the inner and outer diameters of the sleeve.

[0017] Furthermore, the pipe shaft and the annular baffle are connected by bolts.

[0018] Furthermore, the annular baffle is provided with a circumferentially distributed first bolt through hole, the sleeve is provided with a first threaded hole corresponding to the first bolt through hole, and the sleeve and the annular baffle are connected by bolts passing through the first bolt through hole and the first threaded hole; the thrust ring is provided with a circumferentially distributed second bolt through hole, the annular baffle is provided with a second threaded hole corresponding to the second bolt through hole, and the thrust ring and the annular baffle are fitted and fixed by bolts connecting the second bolt through hole and the second threaded hole, and the thrust ring is provided with an avoidance hole for avoiding the mounting bolts of the annular baffle.

[0019] The present invention also provides a crane comprising the above-mentioned assembled frame structure.

[0020] Beneficial effects

[0021] 1. The new assembled frame structure provided by the present invention is conducive to improving the current situation of unbalanced force on the left and right suspension cylinders, improving the reliability of the frame structure, improving the bridge load distribution, improving the force state of the axle, improving the reliability of the axle, extending the life cycle of the vehicle, improving the driving reliability of the vehicle, and improving the driving experience.

[0022] 2. The separation point of the assembled frame in this invention is designed to be located behind the frame seat, avoiding the main load-bearing area of ​​the movable legs. This has minimal impact on the vehicle's lifting performance, reduces deflection in key stress-bearing areas, and increases the local stiffness of the frame. This improves the frame's driving characteristics without affecting the frame's lifting performance.

[0023] 3. The assembled frame structure of the present invention has a simple design, avoids structural complexity, is easy to maintain, and reduces manufacturing costs while meeting the torsional characteristics of the frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is the existing technical solution 1 (1, front section of the frame; 2, front fixed leg; 3, rear section of the frame; 4, rear fixed leg);

[0025] Figure 2 It is the second existing technical solution (1. front section of the frame, 2. frame body; 3. frame seat; 4. rear section of the frame);

[0026] Figure 3 It is the existing technical solution three;

[0027] Figure 4 It is the fourth existing technical solution;

[0028] Figure 5 It is a schematic diagram of the overall three-dimensional structure of an assembled vehicle frame of the present invention;

[0029] Figure 6 It is a partial structural schematic diagram of an assembled vehicle frame of the present invention;

[0030] Figure 7 This is a schematic diagram of the three-dimensional structure of an assembled articulated frame of the present invention;

[0031] Explanation of the accompanying drawings: 1. middle section of the frame; 1-1. shoulder 1-2. tube shaft; 2. rear section of the frame; 2-1. sleeve; 3. shaft sleeve; 3-1. first shaft sleeve; 3-2. second shaft sleeve; 4. annular locking plate; 5. annular baffle; 6. thrust ring. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0034] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0035] Example 1

[0036] An embodiment of the present invention provides an assembled frame structure, including a box-type frame body, wherein the box-type frame body includes: a frame front section, the frame front section having a first end and a second end relatively set; a frame rear section 2, the frame rear section 2 having a first end and a second end relatively set; a frame middle section 1, the frame middle section 1 is located between the second end of the frame front section and the first end of the frame rear section 2, the frame front section, the frame middle section 1 and the frame rear section 2 are arranged in sequence and connected end to end; the frame middle section 1 is connected to the frame front section or the frame rear section 2 through a sleeve connection assembly, the sleeve connection assembly includes a pipe shaft 1-2 and a sleeve 2-1, and the sleeve connection assembly is provided with a T-type thread adjustment assembly located at the insertion end of the pipe shaft, and the T-type thread adjustment assembly generates axial displacement by mutual rotation to adjust the axial gap between the frame middle section and the frame front section or the frame rear section.

[0037] The assembled frame structure provided by the present invention is not only conducive to the transmission and offset of the left and right suspension cylinder forces, but also can improve the stress conditions of the axle and frame through the local torsional characteristics of the rear section of the frame, thereby improving the driving reliability of the entire vehicle, making driving more stable, improving the driving experience, and improving the uneven distribution of axle loads on each axle, thereby improving the reliability of the frame structure and components such as the axle.

[0038] Example 2

[0039] This invention primarily targets K-type or X-type swing-leg frame structures for ultra-large tonnage cranes. The frame structure behind the frame seat is separated to create an assembled frame, allowing the rear end of the frame to rotate around an axis parallel to the vehicle's forward direction. Based on the frame's load-bearing characteristics, the separation point is designed behind the frame seat, avoiding the drive axle. This does not affect the frame's ability to provide rigid support during lifting operations, but also reduces the difficulty of arranging power components. The hollow structure design allows electrical, hydraulic, and other related components to smoothly pass through the hinge point to reach the rear end of the vehicle. Its specific structural form is as follows:

[0040] like Figure 5-7 As shown, an embodiment of the present invention provides an assembled frame structure, including a frame front section, a frame middle section 1 and a frame rear section 2 connected end to end in sequence, the frame middle section 1 is connected to the frame rear section 2 via a sleeve connection assembly, the sleeve connection assembly includes a pipe shaft 1-2 and a sleeve 2-1, and the sleeve connection assembly is provided with a T-type thread adjustment assembly located at the insertion end of the pipe shaft. The T-type thread adjustment assembly generates axial displacement by mutual rotation to adjust the axial gap between the frame middle section and the frame front section or the frame rear section.

[0041] In this embodiment, a frame seat ring is provided on the middle section of the frame, and the frame seat ring extends a tube shaft 1-2 toward the rear section 2 of the frame, and the rear section 2 of the frame is sunken into a sleeve 2-1 toward the second end. The T-type thread adjustment assembly includes an annular baffle 5 with an external thread provided at the insertion end of the tube shaft 1-2 and an annular locking plate 4 with an internal thread cooperating with the annular baffle 5. The inner and outer diameters of the annular baffle 5 are the same as the inner and outer diameters of the tube shaft 1-2 and the sleeve 2-1 is leaked toward the second end of the rear section 2 of the frame. The inner diameter of the annular locking plate 4 is larger than the inner diameter of the sleeve 2-1 and the outer diameter is less than or equal to the outer diameter of the sleeve 2-1.

[0042] Specifically, the separation point of the frame body in the present invention is designed at the rear of the frame seat ring 1 on the middle section of the frame. Figure 6 As shown, the frame seat ring 1 and the frame rear section 2 are matched with the shaft and the sleeve to realize the rotation of the frame rear section 2 around the horizontal central axis of the frame seat ring 1, and the frame seat ring 1 and the frame rear section 2 are connected as a whole through the T-thread adjustment component annular locking plate 4 and the annular baffle 5 through T-thread engagement, and the self-locking characteristics of the T-thread are utilized to realize the transmission of the axial force of the whole vehicle and play an anti-loosening role. The axial displacement generated by the rotation of the annular locking plate 4 is used to adjust the axial clearance between the pipe shaft 1-2 on the frame seat ring and the frame rear section 2, ensuring that the frame rear section 2 can twist freely left and right while ensuring that there is no vibration, abnormal noise and other problems during driving, and finally realizing the left and right swing of the frame tail and achieving displacement compensation.

[0043] In this embodiment, a shaft shoulder 1-1 is provided at one end of the tubular shaft 1-2 close to the frame seat ring.

[0044] In this embodiment, the distance between the frame seat ring and the frame rear section 2 is equal to the length of the shaft shoulder 1 - 1 .

[0045] In this embodiment, the distance between the inner and outer diameters of the tube shaft 1-2 is greater than the distance between the inner and outer diameters of the sleeve 2-1.

[0046] Specifically, such as Figure 6 、 Figure 7 As shown, a shaft shoulder 1-1 and a tube shaft 1-2 are welded to the rear side of the frame seat ring 1. The shaft shoulder 1-1 serves to strengthen the bending resistance of the tube shaft and the sleeve, and at the same time, to limit the axial position of the rear section 2 of the frame.

[0047] In this embodiment, a shaft sleeve 3 is provided on the tubular shaft 1-2, and the sleeve 2-1 has a first end and a second end that are arranged opposite to each other. The shaft sleeve 3 is arranged corresponding to the first end and the second end of the sleeve 2-1. The shaft sleeve 3 located at the first end of the sleeve 2-1 contacts the shaft shoulder 1-1 when the tubular shaft and the sleeve 2-1 are assembled. There is a gap between the two shaft sleeves 3 (the first shaft sleeve 3-1 and the second shaft sleeve 3-2).

[0048] Specifically, the tubular shaft 1-2 on the frame seat ring is inserted into the sleeve 2-1 in the rear section 2 of the frame, and is coaxially assembled with the sleeve 2-1 welded to the rear section 2 of the frame through two shaft sleeves 3. The function of the shaft sleeve 3 is to improve the wear resistance of the contact surface, reduce the contact area, improve the coaxiality of the fit, and reduce maintenance costs.

[0049] In this embodiment, the annular baffle 5 is connected to the pipe shaft 1-2 on the frame seat ring through multiple bolts to form a whole.

[0050] In this embodiment, a thrust ring 6 is also included, which covers the annular baffle 5 and the annular locking plate 4. The thrust ring 6 is fixed to the annular baffle 5 in the direction of the inner diameter, and a gap is provided between the thrust ring 6 and the annular locking plate 4 in the direction of the outer diameter.

[0051] In this embodiment, the annular baffle 5 is provided with a first bolt through hole distributed circumferentially, and the sleeve 2-1 is provided with a first threaded hole corresponding to the first bolt through hole, and the sleeve 2-1 is connected to the annular baffle 5 by passing the bolt through the first bolt through hole and the first threaded hole; the thrust ring 6 is provided with a second bolt through hole distributed circumferentially, and the annular baffle 5 is provided with a second threaded hole corresponding to the second bolt through hole, and the thrust ring 6 and the annular baffle 5 are fitted and fixed by connecting the second bolt through hole and the second threaded hole with bolts, and the thrust ring 6 is provided with an avoidance hole for avoiding the installation bolts of the annular baffle 5.

[0052] Specifically, the thrust ring 6 is provided with multiple through holes and is connected to the annular baffle 5 through multiple bolt connections, so as to prevent the axial gap between the frame seat ring 1 and the frame rear section 2 from being too large due to the rotation of the annular locking plate 4, and thus prevent the vibration of the frame rear section 2 caused by the excessive axial gap, thereby improving driving discomfort. The thrust ring 6 is in contact with the baffle 5 surface, and there is a certain axial gap between it and the annular locking plate 4, which is used to absorb axial deviations caused by errors in assembly and manufacturing.

[0053] The electrical and hydraulic pipelines related to the rear of the frame can be arranged through the hollow structure of the pipe shaft 1-2 on the frame seat ring, and the space is open. Center rotating brackets, rubber strips, etc. can be arranged at both ends of the sleeve to prevent line wear.

[0054] Example 3

[0055] The present invention also provides a crane comprising the assembled frame structure described in Example 1 or 2.

[0056] Definitions of Abbreviations and Key Terms

[0057] Frame: A supporting structure for the crane chassis, which mainly meets the load-bearing functions of lifting weight and traveling load.

[0058] Front section of the frame: The double longitudinal beam I-shaped load-bearing structure arranged at the front end of the frame is mainly used for the layout and bearing of the crane axle, cab, engine and other power systems.

[0059] Rear section of the frame: A box-type structure arranged at the rear section of the frame, mainly used to provide support for crane legs, crane turntable, boom and axle tires.

[0060] Fixed leg: A hollow box-shaped structure welded to the front and rear sides of the rear section of the frame, used to accommodate and support the structure of the crane's movable legs. It is divided into front fixed legs and rear fixed legs according to their position.

[0061] Active outriggers: Assembled on the vehicle frame, they are box-type support structures used to maintain the balance of the vehicle during lifting operations and prevent the vehicle from rolling over. The active outriggers can be extended in a straight line / retracted, swung out / back around the axis, or a combination of the two. According to the different movement modes of the active outriggers, they can be divided into H-type, K-type or X-type outriggers, among which the X-type outriggers are commonly known as swing legs.

[0062] Frame Seat: The component of the crane frame used to connect the upper slewing support. For swing-leg cranes, this box-shaped structure welded between the front and rear sections of the frame connects the front, rear, left, and right swing legs to the crane's turntable, boom, and other components.

[0063] Crane upper part: The parts above the chassis of a wheeled crane, including slewing support, turntable, boom, etc.

[0064] Slewing bearing: A large bearing used for rotation that can withstand the combined loads of axial, radial and tipping moments.

[0065] Suspension Cylinder Support: This component is located on the vehicle frame and is used to mount the suspension cylinder. During vehicle operation, the axle's load-bearing capacity is transferred to the frame via the suspension cylinder, ensuring smooth driving.

[0066] Suspension cylinder: A hydraulic cylinder arranged between the frame suspension cylinder support and the axle. The frame can be raised and lowered by extending and retracting the suspension cylinder.

Claims

1. An assembled vehicle frame structure, characterized in that: The box-type frame body comprises: a front section of the frame, the front section of the frame having a first end and a second end disposed opposite to each other; a rear frame section having a first end and a second end disposed opposite to each other; a mid-frame section, the mid-frame section being located between the second end of the front frame section and the first end of the rear frame section, The front section of the frame, the middle section of the frame and the rear section of the frame are arranged in sequence and connected end to end; The middle section of the frame is connected to the front section or the rear section of the frame via a sleeve connection assembly. The sleeve connection assembly includes a pipe shaft and a sleeve, The sleeve connection assembly is provided with a T-shaped thread adjustment assembly located at the insertion end of the pipe shaft. The T-shaped thread adjustment assembly generates axial displacement by mutual rotation to adjust the axial clearance between the middle section of the frame and the front section or the rear section of the frame.

2. The assembled vehicle frame structure according to claim 1, characterized in that: A frame seat ring is provided on the middle section of the frame. The frame seat ring extends a tube axis toward the rear section of the frame, The rear section of the frame is sunken into a sleeve toward the second end. The T-type thread adjustment assembly includes an annular baffle with external threads provided at the insertion end of the pipe shaft and an annular locking plate with internal threads matched with the annular baffle. The inner and outer diameters of the annular baffle are the same as those of the tube shaft and leak out of the sleeve toward the second end of the rear section of the frame. The inner diameter of the annular locking plate is greater than the inner diameter of the sleeve and the outer diameter is less than or equal to the outer diameter of the sleeve.

3. The assembled vehicle frame structure according to claim 1, characterized in that: It also includes a thrust ring, which covers the annular baffle and the annular locking plate. The thrust ring is fixed to the annular baffle in the direction of the inner diameter, and a gap is provided between the thrust ring and the annular locking plate in the direction of the outer diameter.

4. The assembled vehicle frame structure according to claim 2, wherein: One end of the tubular shaft close to the frame seat ring is provided with a shaft shoulder.

5. The assembled vehicle frame structure according to claim 4, characterized in that: The distance between the frame seat ring and the rear section of the frame is equal to the length of the axle shoulder.

6. The assembled vehicle frame structure according to claim 4, characterized in that: The shaft is provided with a sleeve, and the sleeve has a first end and a second end arranged opposite to each other. The sleeve is arranged corresponding to the first end and the second end of the sleeve. The sleeve located at the first end of the sleeve contacts the shaft shoulder when the shaft and the sleeve are assembled, and there is a gap between the two sleeves.

7. The assembled vehicle frame structure according to claim 1 or 2, characterized in that: The distance between the inner and outer diameters of the tube shaft is greater than the distance between the inner and outer diameters of the sleeve.

8. The assembled vehicle frame structure according to claim 2, wherein: The pipe shaft and the annular baffle are connected by bolts.

9. The assembled vehicle frame structure according to claim 3, characterized in that: The annular baffle is provided with a circumferentially distributed first bolt through hole, the sleeve is provided with a first threaded hole corresponding to the first bolt through hole, and the sleeve and the annular baffle are connected by bolts passing through the first bolt through hole and the first threaded hole; the thrust ring is provided with a circumferentially distributed second bolt through hole, the annular baffle is provided with a second threaded hole corresponding to the second bolt through hole, and the thrust ring and the annular baffle are fitted and fixed by bolts connecting the second bolt through hole and the second threaded hole, and the thrust ring is provided with an avoidance hole for avoiding the mounting bolts of the annular baffle.

10. A crane, characterized in that: The assembled vehicle frame structure comprises the assembled vehicle frame structure according to any one of claims 1 to 9.

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