Assembly type frame structure and crane

Abstract

The invention discloses an assembly type frame structure and a crane, the assembly type frame structure comprises a box-shaped frame body, the box-shaped frame body comprises a frame front section, a frame rear section and a frame rear section, the frame front section is provided with a first end and a second end which are oppositely arranged; the frame rear section is provided with a first end and a second end which are oppositely arranged; the frame middle section is located between the second end of the frame front section and the first end of the frame rear section, and the frame front section, the frame middle section and the frame rear section are sequentially arranged and connected end to end; the frame middle section is connected with the frame front section or the frame rear section through a sleeve connecting assembly, the sleeve connecting assembly comprises a tubular shaft and a sleeve, and the sleeve connecting assembly is provided with a T-shaped thread adjusting assembly located at the insertion end of the tubular shaft. The T-shaped thread adjusting assemblies generate axial displacement through mutual rotation to adjust the axial gap between the frame middle section and the frame front section or the frame rear section. The front part and the rear part of the frame are connected into a whole, local torsion of the tail part of the frame is allowed, and the displacement difference between the left side and the right side of the vehicle is buffered.

Description

Technical Field

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

[0002] Wheeled cranes are mainly composed of booms, turntables and special chassis, and the frame and outriggers are the main load-bearing structural parts of the chassis. The chassis of wheeled cranes is connected to each other through tires, axles, suspension cylinders, frames, power systems and other structures, and is powered by the engine for normal driving. During driving, the resistance of the tires is transmitted to the frame through axles, suspension cylinders and their supports to ensure that the vehicle can drive smoothly.

[0003] As an engineering vehicle, cranes often encounter extremely bad road conditions during the transfer process, especially in mountainous and hilly areas, where the roads are rugged 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 vehicle driving.

[0004] However, the lifting stroke of the suspension cylinder is usually limited. When encountering extremely rugged and harsh road conditions, or for super-large tonnage cranes, the frame length is usually long, the frame itself has certain deformation, and the suspension cylinder stroke sometimes cannot ensure that all tires are fully on the ground during the vehicle turning process. There will be a situation where one side of the tire is on the ground, and the other side of the tire is partially suspended, resulting in serious uneven force on the local suspension cylinder support and the frame and even the axle. In this case of extreme force imbalance, the probability of cracking or twisting of the frame is doubled than usual, and the probability of axle damage is also higher than usual, affecting the life of the whole vehicle and posing certain hidden dangers to the safe driving of the vehicle. Therefore, it is particularly important to develop a new frame structure to make up for the problem of insufficient length of the suspension cylinder, allowing the partial frame to rotate partially around an axis parallel to the forward direction of the vehicle, so that the tires are fully in contact with the ground, so as to balance the axle load of the whole vehicle, improve the force condition of the frame and the axle, and improve the driving safety and reliability of the vehicle.

[0005] At present, the frame of the crane 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 leg, the rear section of the frame and the rear fixed leg; 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 ring and the rear section of the frame. Figure 1 The structure shown is usually used for vehicles 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 frame structures are integral welded structures. The frame is a rigid body, and the vehicle buffers the roughness of the road mainly through the lifting and lowering of the suspension cylinder, which cannot achieve the local left and right torsion of the whole vehicle or the displacement compensation of the left and right sides of the vehicle.

[0006] like Figure 3 As shown, in the current existing structure, the frame structure is an integral rigid structure, and the suspension cylinder support and the frame body are welded as a whole. The displacement impact from the uneven road surface is mainly transmitted to the suspension cylinder through the axle, and is buffered by the elongation and shortening of the suspension cylinder. This complex alternating load and displacement difference is finally transmitted to the frame body through the suspension cylinder support. For road conditions with serious uneven ground, the suspension cylinder stroke occasionally reaches the maximum value and still cannot make up for the height difference, resulting in partial tire suspension, and the load of the whole vehicle cannot be evenly applied to each axle and suspension cylinder, resulting in serious uneven force on the suspension cylinder support and the frame and axle, and the force on the local suspension cylinder support doubles, and the local bridge load increases sharply. The reliability requirements for the frame and axle are high. Especially for super-large tonnage cranes, the body is long, and the body itself may have certain torsional deformation. The longitudinal passability of the whole vehicle requires greater elastic displacement compensation to obtain a more friendly load impact. It is often difficult to balance the displacement difference only through the stroke of the suspension cylinder. This phenomenon poses a great threat to the reliability of the axle 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 in the figure, this type of patent only uses the rear fixed leg as an articulated assembly structure, which can shorten the length and weight of the vehicle in the driving state to a certain extent. For the assembled frame in the crane industry, only the rear fixed leg is designed as a detachable structure, which is more friendly to reducing the length and weight of the vehicle, but has no effect on buffering the ground displacement difference on the left and right sides, and still cannot solve the problem of local axle load imbalance. Summary of the invention

[0008] In view of the deficiencies in the prior art, 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 twisting of the rear of the 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, comprising a box-type frame body, wherein the box-type frame body comprises: a frame front section, wherein the frame front section has a first end and a second end that are relatively arranged; a frame rear section, wherein the frame rear section has a first end and a second end that are relatively arranged; a frame middle section, wherein the frame middle section is located between the second end of the frame front section and the first end of the frame rear section, wherein 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 via a sleeve connection assembly, wherein the sleeve connection assembly comprises a pipe shaft and a sleeve, wherein a T-type thread adjustment assembly is provided on the sleeve connection assembly and is located at an insertion end of the pipe shaft, wherein the T-type thread adjustment assembly generates an axial displacement by mutual rotation to adjust the axial clearance 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, and the T-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, and 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, and 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 tube 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 shaft shoulder.

[0015] Furthermore, a shaft is provided on the shaft, 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 abuts against 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 plate 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 plate 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 plate is provided with a second threaded hole corresponding to the second bolt through hole, and the thrust ring and the annular baffle plate 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 plate.

[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 whole vehicle, improving the driving reliability of the whole vehicle, and improving the driving experience.

[0022] 2. The separation point of the assembled frame in the technology of the present invention is designed at the rear side of the frame seat ring, avoiding the main load-bearing part of the movable leg, which has little effect on the lifting performance of the whole vehicle, reduces the flexural deformation of the key stress-bearing parts, and improves the local stiffness of the frame. Under the premise of not affecting the lifting performance of the frame, the driving characteristics of the frame are improved.

[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 ring; 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 It is a three-dimensional structural schematic diagram of an assembled articulated frame of the present invention;

[0031] Explanation of the reference numerals: 1, middle section of the frame; 1-1, shoulder; 1-2, tube shaft; 2, rear section of the frame; 2-1, sleeve; 3, bushing; 3-1, first bushing; 3-2, second bushing; 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 solution of the present invention, and cannot be used to limit the protection scope 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 positions or positional relationships based on the positions 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", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like 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 clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by 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, wherein the frame front section has a first end and a second end that are relatively arranged; a frame rear section 2, wherein the frame rear section 2 has a first end and a second end that are relatively arranged; a frame middle section 1, wherein 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, wherein 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 via a sleeve connecting assembly, wherein the sleeve connecting assembly includes a pipe shaft 1-2 and a sleeve 2-1, and a T-type thread adjusting assembly is provided on the sleeve connecting assembly at the insertion end of the pipe shaft, wherein the T-type thread adjusting assembly generates an axial displacement by rotating relative to adjust the axial clearance 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 the frame through the local torsion characteristics of the rear frame, improve the driving reliability of the whole vehicle, make the driving more stable, improve the driving experience, improve the problem of uneven distribution of axle loads on each axle, and thus improve the reliability of the frame structure and components such as the axle.

[0038] Example 2

[0039] The present invention is mainly aimed at the K-type or X-type swing-leg frame structure of super-large tonnage cranes. The frame structure after the frame seat ring is separated to make an assembled frame, and the rear of the frame is allowed to rotate around an axis parallel to the forward direction of the vehicle. According to the load-bearing characteristics of the frame, the separation point is designed after the frame seat ring to avoid the drive axle. This does not affect the rigid support provided by the frame during the lifting operation, and reduces the difficulty of arranging the power components. At the same time, the design of the hollow structure allows electrical, hydraulic and other related components to smoothly pass through the hinge point to reach the rear 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 which are connected end to end in sequence, the frame middle section 1 is connected to the frame rear section 2 through a sleeve connecting assembly, the sleeve connecting assembly includes a pipe shaft 1-2 and a sleeve 2-1, and the sleeve connecting 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 clearance 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 axis 1-2 toward the rear section 2 of the frame, and the rear section 2 of the frame is sunken toward the second end with a sleeve 2-1, and the T-type thread adjustment assembly includes an annular baffle 5 with an external thread provided at the insertion end of the tube axis 1-2 and an annular locking plate 4 with an internal thread matched 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 axis 1-2 and the sleeve 2-1 is leaked toward the second end of the rear section 2 of the frame, and 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 by shafts and sleeves 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 used to realize the transmission of the axial force of the whole vehicle and play a role in preventing loosening, wherein the axial displacement generated by the rotation of the annular locking plate 4 is used for 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 be twisted 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 shoulder 1-1 is provided at one end of the tube 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 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, Figure 6 , Figure 7 As shown, a shaft shoulder 1-1 and a tube shaft 1-2 are welded on the rear side of the frame seat ring 1. The shaft shoulder 1-1 is used to strengthen the bending resistance of the tube shaft and the sleeve, and at the same time, the rear section 2 of the frame is axially limited.

[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, and 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 tube 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 the maintenance cost.

[0049] In this embodiment, the annular baffle 5 is connected to the pipe shaft 1-2 on the frame seat ring through multiple bolt connections 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 plate 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 connection between the sleeve 2-1 and the annular baffle plate 5 is achieved by bolts passing 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 plate 5 is provided with a second threaded hole corresponding to the second bolt through hole, and the thrust ring 6 and the annular baffle plate 5 are fitted and fixed by bolting the second bolt through hole and the second threaded hole, and the thrust ring 6 is provided with an avoidance hole for avoiding the mounting bolts of the annular baffle plate 5.

[0052] Specifically, the thrust ring 6 is provided with a plurality of through holes, which are connected to the annular baffle plate 5 via a plurality of bolt connections, so as to prevent the problem of excessive axial clearance between the frame seat ring 1 and the frame rear section 2 caused by the rotation of the locking plate 4, and further prevent the vibration of the frame rear section 2 caused by the excessive axial clearance, so as to improve driving discomfort. The thrust ring 6 is in contact with the baffle plate 5 surface, and there is a certain axial clearance with the locking plate 4, so as to absorb the axial deviation 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. Central 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 chassis of a crane, which mainly meets the load-bearing functions of lifting weight and traveling.

[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: The box-type structure arranged at the rear section of the frame is 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. It is 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: box-type support structures installed on the vehicle frame to keep the vehicle balanced during lifting operations and prevent the vehicle from rolling over. The active outriggers can be extended in a straight line / retracted, swung out / swinged back around an axis, or a combination of the two. They can be divided into H-type, K-type or X-type outriggers according to their different movement modes, among which X-type outriggers are commonly known as swing legs.

[0062] Frame seat ring: a part of the crane frame used to connect the upper vehicle slewing support. For a swing-leg crane, the box-shaped structure welded between the front and rear sections of the frame is used to connect the front, rear, left and right four swing legs with the crane turntable, boom and other parts.

[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: It is arranged on the frame and is used to assemble the structural parts of the suspension cylinder. During the driving process of the vehicle, the bearing force of the axle is transferred to the frame through the suspension cylinder, thereby ensuring the stability of the vehicle during 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 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 section of the frame, the rear section of the frame having a first end and a second end disposed opposite to each other; a mid-section of the frame, the mid-section of the frame being located between the second end of the front section of the frame and the first end of the rear section of the frame, 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 of the frame or the rear section of the frame through a sleeve connection assembly. The sleeve connection assembly comprises 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 of the frame or the rear section of the frame.

2. The assembled 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-thread adjustment assembly comprises an annular baffle with external threads arranged 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 the inner and outer diameters 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, characterized in that: One end of the tube 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 shaft 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 abuts against 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, characterized in that: 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 plate is provided with a first bolt through hole distributed circumferentially, the sleeve is provided with a first threaded hole corresponding to the first bolt through hole, and the sleeve and the annular baffle plate are connected by bolts passing through the first bolt through hole and the first threaded hole; the thrust ring is provided with a second bolt through hole distributed circumferentially, the annular baffle plate is provided with a second threaded hole corresponding to the second bolt through hole, and the thrust ring and the annular baffle plate 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 plate.

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

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