Crawler chassis assembly and engineering machine

Abstract

The application relates to the field of engineering machinery and discloses a crawler chassis assembly and engineering machinery. The crawler chassis assembly comprises a vehicle frame, a crawler frame, a first telescopic beam and a second telescopic beam; the vehicle frame is provided with a through accommodation cavity along the width direction of the vehicle frame and is provided with the crawler frame on both sides respectively; the first telescopic beam and the second telescopic beam are oppositely arranged in the accommodation cavity; the top surfaces of the first cover plate of the first telescopic beam and the second cover plate of the second telescopic beam are flush, and / or the two side surfaces of the first cover plate and the second cover plate are flush; the opposite ends of the first telescopic beam and the second telescopic beam are respectively provided with a first plug-in part and a second plug-in part; and in a full retraction state, the second plug-in part is inserted into the first plug-in part and forms a clearance fit. The crawler chassis assembly disclosed by the application effectively avoids telescopic jamming or collision, improves reliability and assembly process, has a large track gauge adjustment range, has a compact structure, and simultaneously improves the structural strength and rigidity of the telescopic beam and the stability of telescoping.

Description

Technical Field

[0001] This application belongs to the field of construction machinery, specifically relating to a tracked chassis assembly and construction machinery. Background Technology

[0002] Tracked engineering vehicles (such as tracked cranes, demolition machines, and rotary drilling rigs) need to meet various working conditions during construction, including passability in narrow roads, stability during normal operation, and convenience for long-distance transportation. To address these needs, existing technologies typically design the chassis of engineering vehicles with a retractable structure: when passing through narrow sections or during transport, the track frames on both sides are fully retracted to meet width restrictions; in the working state, the track frames are fully or partially extended to adapt to the support span requirements of different construction scenarios.

[0003] To achieve greater track gauge adjustment capability, current solutions typically employ long telescopic beams on both sides of the chassis. One end of each beam connects to the corresponding track frame, while the other end inserts into a guide cavity within the chassis. While this structure allows for a wide range of track gauge adjustments, it requires sufficient space within the chassis to accommodate the telescopic beams, resulting in an increase in the chassis's lateral dimensions. Furthermore, when both telescopic beams retract simultaneously into the same guide cavity, structural interference can easily occur between the long beams, affecting the chassis's compactness and reliability. Summary of the Invention

[0004] The purpose of this application is to provide a tracked chassis assembly and engineering machinery to solve the problems of structural interference and non-compact structure caused by existing telescopic tracked chassis in order to achieve a wide range of track gauge adjustments.

[0005] To achieve the above objectives, the first aspect of this application provides a tracked chassis assembly, including a frame, a track frame, a first telescopic beam, and a second telescopic beam; The vehicle frame has a through-hole cavity along its width and track frames are arranged on both sides. The first telescopic beam and the second telescopic beam are inserted into the cavity and connected to the track frames on the corresponding sides. The first telescopic beam has a first cover plate and the second telescopic beam has a second cover plate. The top surfaces of the first cover plate and the second cover plate are flush, and / or the two sides of the first cover plate and the second cover plate are flush. The first telescopic beam and the second telescopic beam are respectively provided with a first insertion part and a second insertion part at opposite ends. When the first telescopic beam and the second telescopic beam are in the fully retracted state, the second insertion part is inserted into the first insertion part and forms a clearance fit.

[0006] As a further improvement to the above technical solution: In some embodiments, the end of the first telescopic beam near the second telescopic beam is provided with an accommodating space for the second insertion part to be inserted; When the first telescopic beam and the second telescopic beam are in the fully retracted state, the second insertion part is housed in the accommodating space and is clearance-fitted with the accommodating space, while the second cover plate is exposed outside the accommodating space.

[0007] In some embodiments, the bottom of the receiving cavity is provided with a first shim for supporting the sliding of the first telescopic beam and a second shim for supporting the sliding of the second telescopic beam. The thickness of the first shim is h1, the thickness of the second shim is h2, and the height from the bottom surface of the receiving space to the top surface of the first shim is h3. Among them, the following condition is met: h1 + h3 < h2.

[0008] In some embodiments, along the width direction of the accommodating space, the first telescopic beam further includes two oppositely arranged first side plates, and the second telescopic beam further includes two oppositely arranged second side plates; In the first insertion part, the distance between the inner walls of the two first side plates is W1; in the second insertion part, the distance between the outer walls of the two second side plates is W2, satisfying: W1 > W2.

[0009] In some embodiments, the first insertion portion is provided with a first open section and a first receiving section in sequence from the direction away from the second telescopic beam. The first open section and the receiving section communicate to form the accommodating space. One end of the first cover plate extends and covers the top of the first receiving section. The top of the first open section is an open section. The second insertion part is provided with a second open section and a second receiving section in sequence from the direction away from the first telescopic beam. One end of the second cover plate extends and covers the top of the second receiving section, and the top of the second open section is an open section. When the first telescopic beam and the second telescopic beam are in a fully retracted state, the second open section is housed within the first housing section, and the second housing section is located within the first open section.

[0010] In some embodiments, a first wedge-shaped notch is provided above the end of the first open section near the second telescopic beam; And / or, the second open section is provided with a second wedge-shaped notch above one end of the first telescopic beam.

[0011] In some embodiments, when the two sides of the first cover plate and the second cover plate are flush, the tracked chassis assembly further includes a clearance adjustment mechanism; The receiving cavity is provided with the gap adjustment mechanism on both sides. The gap adjustment mechanism is provided on the side of the first cover plate and the second cover plate and is used to adjust the size of the movable gap between the first cover plate and the second cover plate in the receiving cavity.

[0012] In some embodiments, the gap adjustment mechanism includes a limiting plate and a push adjustment assembly; The limiting plate is arranged in the receiving cavity; The push-adjustment assembly is disposed on the frame and is movably connected to the limiting plate. The push-adjustment assembly is used to drive the limiting plate to move and adjust along the width direction of the receiving cavity.

[0013] In some embodiments, the frame is provided with a pin insertion mechanism corresponding to the first telescopic beam and the second telescopic beam, and the pin of the pin insertion mechanism extends into the receiving cavity; wherein, the first telescopic beam and the second telescopic beam are provided with a plurality of limiting pin holes for the pin to be inserted and engaged along their own telescopic direction, and / or, the first telescopic beam and the second telescopic beam are provided with limiting grooves along their own telescopic direction, the pin is at least partially inserted into the limiting groove, and the bottom of the limiting groove is provided with a plurality of limiting pin holes for the pin to be inserted and engaged; And / or, the frame is equipped with a position sensor for detecting the telescopic position information of the first telescopic beam and the second telescopic beam.

[0014] To achieve the above objectives, a second aspect of this application provides an engineering machine including the tracked chassis assembly described in the first aspect above.

[0015] Compared to existing technologies, the tracked chassis assembly and engineering machinery provided in this application have at least the following beneficial effects: The tracked chassis assembly provided in this application arranges a first telescopic beam and a second telescopic beam respectively in the receiving cavity of the chassis. The first and second telescopic beams can extend out of the receiving cavity and retract into the receiving cavity relative to the chassis, thereby driving the track frame on the corresponding side to extend and retract for track gauge adjustment. Furthermore, this application provides a first insertion part and a second insertion part at opposite ends of the first and second telescopic beams respectively. When the first and second telescopic beams are in the fully retracted state, the second insertion part inserts into the first insertion part, forming a clearance fit. Based on the above structure, this application effectively solves the problem of end interference that easily occurs during the retraction process of traditional double-sided telescopic beams by inserting the first and second insertion parts in the fully retracted state. The introduction of the clearance fit ensures sufficient assembly tolerance between the two, maintaining smooth relative movement even under manufacturing errors or assembly deviations, avoiding jamming or collision, and significantly improving the operational reliability and assembly processability of the telescopic mechanism. Furthermore, by partially interlocking the first and second telescopic beams in the fully retracted state, reinforcing ribs can be installed in the non-interlocking areas of the first and second telescopic beams to enhance the overall structural strength.

[0016] Secondly, during the telescopic process, the top surfaces of the first and second cover plates are flush, and / or the two sides of the first and second cover plates are flush. Compared to the traditional two-telescopic-beam structure that uses a large difference in size (one large and one small), the structural design of this application ensures that during the telescopic process, at least one of the gaps between the first and second telescopic beams and the top or side gaps of the receiving cavity remains consistent. This effectively improves the structural strength and rigidity of the first and second telescopic beams, enhances the stability of telescopic movement, and facilitates the optimization of the processing and assembly technology of the tracked chassis assembly.

[0017] Furthermore, since the first and second telescopic beams partially overlap in their fully retracted state, compared to the traditional design where the two telescopic beams are arranged independently and do not overlap, this application significantly extends the effective extension stroke of a single telescopic beam without increasing the overall lateral width of the chassis. Thus, by setting the overlapping section, the effective length of the first and second telescopic beams can be partially extended into the opposite space, thereby achieving a wider range of track gauge adjustment without increasing the chassis profile. This makes the tracked chassis assembly more compact and improves the overall adaptability of the machine. During transport or passage through narrow roads, both track frames can be fully retracted to the minimum track gauge to meet road width restrictions. During construction operations, thanks to the increased extension stroke of the first and second telescopic beams, the track frames can extend to obtain different track gauges, thereby achieving different support spans. This significantly improves the adaptability, anti-overturning stability, and load-bearing capacity of the construction machinery in lifting, drilling, or demolition operations.

[0018] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings: Figure 1 This application provides a schematic diagram of a track chassis assembly in a fully extended state after the track frame is concealed. Figure 2 A schematic diagram of the first and second telescopic beams in the fully extended state of the tracked chassis assembly provided in this embodiment of the application; Figure 3 This is a schematic diagram of the assembly between the first telescopic beam and the vehicle frame in an embodiment of this application; Figure 4 A three-dimensional schematic diagram of a partial structure of the first telescopic beam and the second telescopic beam in the tracked chassis assembly provided in the embodiments of this application, in the state of assembly with the vehicle frame; Figure 5 A schematic diagram of the clearance fit between the first telescopic beam and the second telescopic beam in the tracked chassis assembly provided in this embodiment of the application; Figure 6 for Figure 4 A three-dimensional schematic diagram of a portion of the structure within the receiving cavity of the first and second telescopic beams of the rear frame; Figure 7 A three-dimensional structural schematic diagram of the first cover plate of the first telescopic beam provided in an embodiment of this application; Figure 8 A schematic diagram of the track frame fully extended (a) and fully retracted (b) states in a tracked chassis assembly provided for an embodiment of this application; Figure 9 for Figure 2 A magnified view of the local structure at point A in the middle.

[0020] Explanation of reference numerals in the attached figures 100. Frame; 110. Receiving cavity; 120. First shim; 130. Second shim; 200, First telescopic beam; 200a, Accommodation space; 201, First side plate; 201a, First wedge-shaped notch; 202, First cover plate; 203, Limiting pin hole; 203a, Fully extended limiting pin hole; 203b, Intermediate limiting pin hole; 203c, Fully retracted limiting pin hole; 204, Limiting groove; 205, Assembly hole; 210, First insertion part; 211, First open section; 220, First reinforcing rib structure; 300. Second telescopic beam; 301. Second side plate; 302. Second cover plate; 310. Second insertion part; 311. Second open section; 320. Second reinforcing rib structure; 400. Gap adjustment mechanism; 410. Limiting plate; 420. Push adjustment assembly; 421. Adjusting bolt; 422. Nut; 500. Track frame; 510. Locating pin; 520. Mounting base; 600. Insertion / removal pin mechanism; 610. Pin; 620. Insertion / removal drive assembly; 700, Position sensor; 800. Detachable structure; 810. Wedge block; 820. Locking bolt; 900. Telescopic drive mechanism. Detailed Implementation

[0021] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0022] The present application will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0023] Example: On the one hand, please refer to Figure 1 , Figure 2 and Figure 3 This embodiment provides a tracked chassis assembly that can be used in engineering machinery, such as tracked cranes, demolition machines, rotary drilling rigs, etc., to achieve chassis gauge adjustment, taking into account both transportation convenience and operational stability.

[0024] The tracked chassis assembly provided in this embodiment includes a frame 100, a track frame 500, a first telescopic beam 200, and a second telescopic beam 300.

[0025] The vehicle frame 100 has a through-hole 110 along its width and track frames 500 arranged on both sides, that is, track frames 500 are arranged at both ends of the 110. In some embodiments, the number of 110 can be multiple (two or more) to ensure the stability of the track frames 500 during extension and retraction. In this embodiment, 110 is provided at both ends of the vehicle frame 100 along its length, and each 110 is equipped with a first telescopic beam 200 and a second telescopic beam 300. To more clearly illustrate the technical solution of this application, one of the two 110s will be described below.

[0026] Please refer to the following: Figure 4 and Figure 5 In this embodiment, the first telescopic beam 200 and the second telescopic beam 300 are aligned and inserted into the receiving cavity 110, and the first telescopic beam 200 and the second telescopic beam 300 are respectively connected to the track frame 500 on the corresponding side.

[0027] Furthermore, the first telescopic beam 200 has a first cover plate 202, and the second telescopic beam 300 has a second cover plate 302; wherein the top surfaces of the first cover plate 202 and the second cover plate 302 are flush. In other words, during the telescopic process of the first telescopic beam 200 and the second telescopic beam 300, the gap between the first cover plate 202 and the second cover plate 302 and the top of the receiving cavity 110 will not change with the telescopic process. Thus, compared with the traditional two telescopic beam structures that use a large-size and small-size interlocking scheme, the structural design of this application can ensure that the gap between the first telescopic beam 200 and the second telescopic beam 300 and the top of the receiving cavity 110 remains consistent during the telescopic process, effectively ensuring uniform stress on the first telescopic beam 200 and the second telescopic beam 300 and improving the stability of telescopic movement, while also facilitating the optimization of the processing and assembly processes of the tracked chassis assembly.

[0028] In some embodiments, the two sides of the first cover plate 202 and the second cover plate 302 are flush. In other words, during the extension and retraction of the first telescopic beam 200 and the second telescopic beam 300, the movement gaps between the first cover plate 202 and the second cover plate 302 and the sides of the receiving cavity 110 are consistent. Thus, compared with the traditional two telescopic beam structures that use a large size difference between the two beams, the structural design of this application can ensure that during the extension and retraction process, the movement gaps between the first telescopic beam 200 and the second telescopic beam 300 and the sides of the receiving cavity 110 are consistent. There is no need to configure additional pads to adjust the movement gap of the smaller telescopic beam, which effectively ensures the uniform force on the first telescopic beam 200 and the second telescopic beam 300 and improves the stability of extension and retraction. At the same time, it is convenient to optimize the processing and assembly processes of the tracked chassis assembly.

[0029] The first telescopic beam 200 and the second telescopic beam 300 are respectively provided with a first insertion part 210 and a second insertion part 310 at their opposite ends. When the first telescopic beam 200 and the second telescopic beam 300 are in their fully retracted state, the second insertion part 310 is inserted into the first insertion part 210 and has a clearance fit with the first insertion part 210. When the first telescopic beam 200 and the second telescopic beam 300 are in their fully extended state, the second insertion part 310 is pulled out relative to the first insertion part 210, thereby separating the first insertion part 210 and the second insertion part 310 from each other.

[0030] Thus, in the tracked chassis assembly provided in this embodiment, the first telescopic beam 200 and the second telescopic beam 300 extend out of the receiving cavity 110 and retract into the receiving cavity 110 relative to the frame 100 (the telescopic movement of the first telescopic beam 200 and the second telescopic beam 300 is driven by the telescopic drive mechanism 900 described below), thereby driving the corresponding track frame 500 to extend and retract for track gauge adjustment. Furthermore, this embodiment provides a first insertion part 210 and a second insertion part 310 at opposite ends of the first telescopic beam 200 and the second telescopic beam 300, respectively. When the first telescopic beam 200 and the second telescopic beam 300 are in the fully retracted state, the second insertion part 310 inserts into the first insertion part 210 and forms a clearance fit. At this time, the first insertion part 210 and the second insertion part 310 are in an overlapping state but do not contact each other. Based on the above structure, this embodiment effectively solves the problem of end interference that easily occurs during the retraction process of traditional double-sided telescopic beams by using the insertion fit between the first insertion part 210 and the second insertion part 310. The design clearance ensures sufficient assembly tolerance between the two components, maintaining smooth relative movement even with manufacturing errors or assembly deviations, preventing jamming or collisions, and significantly improving the operational reliability and assembly processability of the telescopic mechanism. Furthermore, by partially interlocking the first telescopic beam 200 and the second telescopic beam 300 in the fully retracted state, reinforcing ribs can be installed in the non-interlocking areas of the first and second telescopic beams 200 to enhance the overall structural strength.

[0031] Secondly, during the telescopic process, the top surfaces of the first cover plate 202 and the second cover plate 302 of the first telescopic beam 200 and the second telescopic beam 300 are flush, and / or, the two sides of the first cover plate 202 and the second cover plate 302 are flush. Compared with the traditional two telescopic beam structures that use a large-size and small-size interlocking scheme, the structural design of this embodiment can ensure that during the telescopic process, at least one of the gaps between the first telescopic beam 200 and the second telescopic beam 300 and the top gap and the side gap of the receiving cavity 110 is consistent. This improves the structural strength and rigidity of the first telescopic beam 200 and the second telescopic beam 300, further enhances the stability of telescopic movement, and facilitates the optimization of the processing and assembly processes of the tracked chassis assembly.

[0032] It should also be noted that, since the first telescopic beam 200 and the second telescopic beam 300 partially overlap in their fully retracted state, compared to the traditional solution where the telescopic beams on both sides are arranged completely independently and do not overlap, this embodiment significantly extends the effective extension stroke of the telescopic beam on one side without increasing the overall lateral width of the chassis 100. Thus, by setting the overlapping section, the effective length of the first telescopic beam 200 and the second telescopic beam 300 can be partially extended into the opposite space, thereby achieving a wider range of track gauge adjustment without increasing the overall dimensions of the chassis 100, making the tracked chassis assembly more compact. By reasonably setting the insertion length of the second insertion part 310, the bending deformation of the telescopic beam inside the receiving cavity 110 of the chassis 100 is small under concentrated force after the first telescopic beam 200 and the second telescopic beam 300 are fully retracted, resulting in better stiffness compared to other solutions using telescopic beams that meet the same conditions.

[0033] Furthermore, this structural design indirectly enhances the overall machine's adaptability to various working conditions. During transportation or passage through narrow roads, the track frames 500 on both sides can be fully retracted to the minimum track gauge to meet road width restrictions. During construction operations, thanks to the increased extension stroke of the first telescopic beam 200 and the second telescopic beam 300, the track frame 500 can extend to a wider range of track gauge adjustment, thereby obtaining more support span and significantly improving the anti-overturning stability and load-bearing capacity of the construction machinery in lifting, drilling, or demolition operations.

[0034] To more clearly describe the technical solution of this application, the tracked chassis assembly provided in this embodiment is described in detail below: Please see Figure 2 , Figure 3 , Figure 4 and Figure 5 Both the first telescopic beam 200 and the second telescopic beam 300 are hollow structures. The first telescopic beam 200 has a receiving space 200a at one end near the second telescopic beam 300 for the second insertion part 310 to be inserted. In other words, the first insertion part 210 has the receiving space 200a.

[0035] Thus, when the first telescopic beam 200 and the second telescopic beam 300 are in their fully retracted state, the second insertion part 310 is inserted into the accommodating space 200a and forms a clearance fit with the accommodating space 200a. That is to say, after the second insertion part 310 is inserted into the first insertion part 210, the second insertion part 310 is suspended entirely in the accommodating space 200a and does not contact the first telescopic beam 200. This effectively avoids wear and interference problems during the retraction process, ensuring the normal operation of the construction machinery.

[0036] Please refer to the following: Figure 6Specifically, the bottom of the receiving cavity 110 is provided with a first raising block 120 for supporting the sliding of the first telescopic beam 200 and a second raising block 130 for supporting the sliding of the second telescopic beam 300. Furthermore, in this embodiment, the first telescopic beam 200 is always in contact with the first raising block 120 during sliding, and similarly, the second telescopic beam 300 is always in contact with the second raising block 130 during sliding. Thus, the provision of the first raising block 120 and the second raising block 130 effectively prevents the first telescopic beam 200 and the second telescopic beam 300 from directly contacting the bottom wall of the receiving cavity 110. It also has the following effects: As a large hollow structure on the frame 100, the receiving cavity 110's bottom wall surface is typically difficult to machine with high precision, making it challenging to control surface roughness and flatness. If the first telescopic beam 200 and the second telescopic beam 300 directly slide in contact with the bottom wall of the receiving cavity 110, the rough surface will exacerbate friction and wear. Over long-term operation, this can lead to uneven wear on the bottom surfaces of the first telescopic beam 200 and the second telescopic beam 300, affecting sliding accuracy and fit clearance. In contrast, the first shim block 120 and the second shim block 130, as independent components, can be made of wear-resistant materials, and their upper surfaces can be precision-machined to achieve lower surface roughness and higher flatness. The first telescopic beam 200 and the second telescopic beam 300 slide on their corresponding first shim blocks 120 and 130, resulting in a low coefficient of friction, significantly reduced wear, and extended service life.

[0037] Furthermore, due to the arrangement of the first raising block 120 and the second raising block 130, it is not necessary to perform high-precision machining on the entire bottom wall of the receiving cavity 110. Only the planes of the first raising block 120 and the second raising block 130 themselves and the areas where the first raising block 120 and the second raising block 130 are installed need to be machined, thereby simplifying the manufacturing process of the frame 100 and reducing the processing difficulty and manufacturing cost. At the same time, the first raising block 120 and the second raising block 130 themselves have a simple structure and are easy to process.

[0038] In some embodiments, the first shim 120 and the second shim 130 can also be detachably disposed in the receiving cavity 110. In this way, when wear occurs after long-term use, only the first shim 120 and the second shim 130 need to be replaced to restore the original sliding fit accuracy. There is no need to repair the entire frame 100, resulting in lower maintenance costs.

[0039] In this embodiment, reference Figure 2The perspective shown is as follows: the vertical direction is up and down, the width direction of the frame 100 is left and right, and the thickness of the first raising block 120 is defined as h1, the thickness of the second raising block 130 as h2, and the height from the bottom surface of the accommodating space 200a to the top surface of the first raising block 120 is defined as h3; wherein, the following condition is satisfied: h1 + h3 < h2. Thus, when the first telescopic beam 200 and the second telescopic beam 300 are in their fully retracted state, after the second insertion part 310 is inserted into the first insertion part 210, the second insertion part 310 does not contact the bottom surface of the accommodating space 200a, i.e., there is a clearance. It can be understood that the difference range obtained by h2 - (h1 + h3) is the clearance size range of the clearance fit formed by the second insertion part 310 inserting into the first insertion part 210.

[0040] In some embodiments, the range of the difference between h2 and (h1+h3) is designed with reference to the movable clearance between the top surface of the first telescopic beam 200 or the second telescopic beam 300 and the top surface of the receiving cavity 110. For example, the range of the difference between h2 and (h1+h3) is 1.5 to 2 times the maximum movable clearance between the top surface of the first telescopic beam 200 and the second telescopic beam 300 and the top surface of the receiving cavity 110.

[0041] like Figure 5 As shown, along the width direction of the accommodating space 200a, the first telescopic beam 200 also includes a distance W1 between the inner walls of two oppositely arranged first side plates 201.

[0042] Furthermore, along the width direction of the accommodating space 200a, the second telescopic beam 300 also includes two opposing second side plates 301, with a distance W2 between the outer walls of the two second side plates 301. Wherein, W1 > W2. This ensures that after the second insertion part 310 is inserted into the first insertion part 210, there is an assembly gap between the second side plate 301 and the first side plate 201, preventing wear between the second side plate 301 and the first side plate 201 and extending their service life. It can be understood that the difference between W1 and W2 is the range of the bilateral gap dimensions for the clearance fit formed by the second insertion part 310 inserting into the first insertion part 210 (e.g., ...). Figure 5 The letter C1 is used to indicate a unilateral gap.

[0043] In some embodiments, when designing the range of difference between W1 and W2, the maximum deflection of the first telescopic beam 200 and the second telescopic beam 300 when they swing left and right should be used as a reference. For example, the range of difference between W1 and W2 is greater than the sum of the maximum deflection of the first telescopic beam 200 and the second telescopic beam 300 when they swing left and right. In this way, controlling the gap value is beneficial for telescopic track changing.

[0044] Please see Figure 2 , Figure 3 , Figure 4and Figure 5 In this embodiment, the first insertion part 210 is provided with a first open section 211 and a first receiving section in sequence from the direction away from the second telescopic beam 300. The first open section 211 and the receiving section are connected to form the above-mentioned accommodating space 200a. One end of the first cover plate 202 extends and covers the top of the first receiving section. Thus, the top of the first open section 211 is an open.

[0045] The second insertion portion 310 is provided with a second open section 311 and a second receiving section in sequence from the direction away from the first telescopic beam 200. One end of the second cover plate 302 extends and covers the top of the second receiving section, thus the top of the second open section 311 is open. It can be understood that when the first telescopic beam 200 and the second telescopic beam 300 are in the fully retracted state, the second open section 311 is received within the first receiving section, and the second receiving section is located within the first open section 311.

[0046] Thus, during full retraction, the second open section 311 first inserts into the first open section 211, and then enters the first receiving section. The arrangement of the second open section 311 and the first open section 211 provides a certain guiding function, ensuring that the center surfaces of the first telescopic beam 200 and the second telescopic beam 300 are coplanar, preventing interference between the side plates during telescopic movement. After the second insertion part 310 is inserted into the receiving space 200a and overlaps with the first insertion part 210, the top surfaces of the first cover plate 202 and the second cover plate 302 are flush, ensuring a smaller dimensional difference between the first telescopic beam 200 and the second telescopic beam 300, resulting in better structural strength and stress consistency. Furthermore, the contact limit between the opposing end faces of the first cover plate 202 and the second cover plate 302 can be used to form a limit for the shortest retraction stroke, preventing excessive retraction of the first telescopic beam 200 and the second telescopic beam 300, thereby providing safety assurance.

[0047] In some embodiments, the first telescopic beam 200 is provided with a first reinforcing rib structure 220 in the interior away from the first insertion portion 210 to improve the structural strength of the entire first telescopic beam 200.

[0048] In some embodiments, the second telescopic beam 300 is provided with a second reinforcing rib structure 320 inside the second insertion portion 310 to improve the overall structural strength of the second telescopic beam 300. Of course, the second reinforcing rib structure 320 can also be provided at a local location within the second insertion portion 310.

[0049] The first open section 211 is provided with a first wedge-shaped notch 201a above the end near the second telescopic beam 300 (as shown in the image). Figure 3 As shown), this provides a guide for the insertion of the second receiving section into the first open section 211, effectively preventing interference between the top of the first insertion part 210 and the second cover plate 302.

[0050] In some embodiments, a second wedge-shaped notch (not shown) is provided above one end of the second open section 311 near the first telescopic beam 200. This provides guidance for the insertion of the second open section 311 into the first receiving section, effectively preventing interference between the top of the second insertion portion 310 and the first cover plate 202. For this purpose, a first reinforcing rib structure 220 (e.g., ...) is provided at a local location within the first insertion portion 210. Figure 3 As shown), the first reinforcing rib structure 220 within the first insertion portion 210 should avoid the second open section 311.

[0051] Please see Figure 4 , Figure 5 and Figure 6 Furthermore, since the sides of the first cover plate 202 and the second cover plate 302 are flush (e.g.) Figure 5 As shown in the figure, this ensures that the first telescopic beam 200 and the second telescopic beam 300 have the same movable clearance with the receiving cavity 110 in the width direction, further improving the stability of the telescopic movement of the first telescopic beam 200 and the second telescopic beam 300. Based on this, the tracked chassis assembly provided in this embodiment also includes a clearance adjustment mechanism 400. The clearance adjustment mechanism 400 is provided on both sides of the receiving cavity 110. The clearance adjustment mechanism 400 corresponds to the side of the first cover plate 202 and the second cover plate 302 and is used to adjust the size of the movable clearance of the side in the receiving cavity 110, thereby providing stable guidance for the telescopic movement of the first telescopic beam 200 and the second telescopic beam 300.

[0052] Specifically, the gap adjustment mechanism 400 includes a limiting plate 410 and a pushing adjustment assembly 420. The limiting plate 410 is arranged in the receiving cavity 110 and is a long strip-shaped plate structure that extends along the length of the receiving cavity 110. The plate surface of the limiting plate 410 faces the side wall of the first cover plate 202 and the second cover plate 302.

[0053] The push-adjustment assembly 420 is mounted on the frame 100 and is movably connected to the limiting plate 410. The push-adjustment assembly 420 can drive the limiting plate 410 to move along the width direction of the receiving cavity 110. Thus, when it is necessary to install or remove the first telescopic beam 200 and the second telescopic beam 300, by adjusting the push-adjustment assembly 420, the two limiting plates 410 can be pushed away from each other, thereby increasing the gap and facilitating the installation or removal of the first telescopic beam 200 and the second telescopic beam 300. After the telescopic beam is installed, the limiting plate 410 can be pushed closer to the side of the first cover plate 202 and the second cover plate 302, thereby reducing the movable gap between the first telescopic beam 200 and the second telescopic beam 300 and the side wall of the receiving cavity 110, ensuring the stability of telescopic movement during subsequent operation. When the guide surface of the telescopic beam wears due to long-term use, and the gap increases, it can also be compensated by the gap adjustment mechanism 400.

[0054] Optionally, the push adjustment assembly 420 can be a combination of an adjustment bolt 421 and a nut 422, wherein the frame 100 is provided with a corresponding threaded hole, the adjustment bolt 421 passes through the threaded hole and is movably connected to the limit plate 410, and the nut 422 is located between the bolt head and the frame 100. The adjustment bolt 421 can be locked or unlocked by turning the nut 422.

[0055] Please see Figure 1 , Figure 2 and Figure 3 In this embodiment, the frame 100 is provided with a pin insertion mechanism 600 corresponding to the first telescopic beam 200 and the second telescopic beam 300 respectively. The pin 610 of the pin insertion mechanism 600 extends into the receiving cavity 110. The first telescopic beam 200 and the second telescopic beam 300 are provided with a plurality of limiting pin holes 203 for the pin 610 to be inserted and cooperated along their own telescopic direction.

[0056] To more clearly describe the technical solution of this application, this embodiment is described in terms of the cooperation between the first telescopic beam 200 and the insertion and removal pin mechanism 600. It should be understood that the structural design and cooperation method of the insertion and removal pin mechanism 600 and the first telescopic beam 200 described below are also applicable to the second telescopic beam 300.

[0057] Please refer to the following: Figure 7 Specifically, the first cover plate 202 of the first telescopic beam 200 is provided with multiple limiting pin holes 203 for the insertion and engagement of the pin 610. Different limiting pin holes 203 correspond to different extension strokes of the first telescopic beam 200, that is, to different track gauges of the track frame 500.

[0058] Please refer to the following: Figure 8 In this embodiment, taking three limiting pin holes 203 as an example, the three limiting pin holes 203 are a fully extended limiting pin hole 203a, an intermediate limiting pin hole 203b, and a fully retracted limiting pin hole 203c. Specifically, when the track frame 500 is in the fully extended state (e.g., Figure 8 As shown in Figure a), the fully extended limiting pin hole 203a is aligned with the pin 610 of the insertion and removal pin mechanism 600; when the track frame 500 is in the fully retracted state (as shown in Figure a), the fully extended limiting pin hole 203a is aligned with the pin 610 of the insertion and removal pin mechanism 600; Figure 8 As shown in Figure b), the fully retracted limiting pin hole 203c is aligned with the pin 610 of the insertion and removal pin mechanism 600. The fully extended limiting pin hole 203a and the fully retracted limiting pin hole 203c ensure that the first telescopic beam 200 can be accurately and reliably locked in both extreme working positions.

[0059] The intermediate limiting pin hole 203b is located between the fully extended limiting pin hole 203a and the fully retracted limiting pin hole 203c. The number of intermediate limiting pin holes 203b can be one or more, each corresponding to a different intermediate track gauge. For example, a single intermediate limiting pin hole 203b can be provided, corresponding to a specific intermediate track gauge, suitable for light-load operation scenarios where stability requirements are not high, but wider support than in transport mode is desired. The distances between this intermediate limiting pin hole 203b and the fully extended and fully retracted limiting pin holes 203a and 203c can be the same or different, depending on the specific design. In some embodiments, by providing multiple intermediate limiting pin holes 203b, more diverse track gauge options can be offered to the construction machinery, enabling it to better adapt to complex and changing construction sites, achieving better site adaptability and operational flexibility.

[0060] Furthermore, the top surface of the first cover plate 202 is also provided with a limiting groove 204 corresponding to the insertion and removal pin mechanism 600. The limiting groove 204 extends along the extension and retraction direction of the first telescopic beam 200, and the length of the limiting groove 204 is consistent with the extension and retraction stroke of the first telescopic beam 200. The pin 610 extends at least partially into the limiting groove 204 and is in clearance fit with the limiting groove 204. The bottom of the limiting groove 204 is provided with a plurality of limiting pin holes 203 for the insertion of the pin 610 along its own length direction.

[0061] Specifically, the limiting groove 204 is an elongated, waist-shaped hole structure. Furthermore, along its length, the bottom of the limiting groove 204 is provided with a fully extended limiting pin hole 203a, a middle limiting pin hole 203b, and a fully retracted limiting pin hole 203c. The fully extended limiting pin hole 203a and the fully retracted limiting pin hole 203c are located at opposite ends of the limiting groove 204.

[0062] Furthermore, since the pin 610 at least partially extends into the limiting groove 204 and forms a clearance fit with the side wall of the limiting groove 204, under normal conditions, the pin 610 does not make frictional contact with the side wall of the limiting groove 204. It should be noted that under normal use, the gap between the limiting plate 410 of the gap adjustment mechanism 400 and the first cover plate 202 and the second cover plate 302 is smaller than the gap between the pin 610 and the side wall of the limiting groove 204. Thus, this embodiment mainly utilizes the limiting plate 410 for limiting and guiding the extension and retraction of the first telescopic beam 200. Even if the first telescopic beam 200 deviates, it will preferentially contact the limiting plate 410, and the pin 610 will not contact the side wall of the limiting groove 204, but it can serve as a second layer of limiting protection.

[0063] It is also understandable that when the first telescopic beam 200 extends to the preset travel position, the pin 610 aligns with one of the limiting pin holes 203. The pin insertion and removal mechanism 600 drives the pin 610 to insert into the corresponding limiting pin hole 203, thereby locking the first telescopic beam 200 in the current position. When the first telescopic beam 200 needs to continue extending or retracting, the pin insertion and removal mechanism 600 drives the pin 610 to be pulled out a certain travel, ensuring that part of the pin 610 remains within the limiting groove 204 to prevent it from coming out.

[0064] In some embodiments, the maximum length of the pin 610 inserted into the limiting slide 204 is less than the depth of the limiting slide 204. Optionally, considering stability, the maximum length of the pin 610 inserted into the limiting slide 204 may be selected to be three-quarters to one-half of the depth of the limiting slide 204.

[0065] Therefore, a purely mechanical limiting structure is constructed through the cooperation of the pin 610 and the limiting groove 204. Since the length of the limiting groove 204 is consistent with the stroke of the first telescopic beam 200, and the pin 610 is always located within the limiting groove 204, the pin 610 and the limiting groove 204 maintain a constant constraint fit throughout the entire extension and retraction process of the first telescopic beam 200. The cooperation between the two ends of the limiting groove 204 and the pin 610 forms a mechanical stroke endpoint limit. When the first telescopic beam 200 extends to its maximum stroke, the end wall of the limiting groove 204 away from the track frame 500 contacts the pin 610, preventing the first telescopic beam 200 from extending further; similarly, when the first telescopic beam 200 retracts to its minimum stroke, the end wall of the limiting groove 204 near the track frame 500 also contacts the pin 610, preventing it from retracting further. This mechanical limiting method based on hard contact, compared to software limiting schemes that rely on limit sensors, can effectively reduce the interference of harsh working conditions such as external vibration and dust on the reliability of telescopic control, and has higher reliability and safety. Even in the event of sensor failure or control system malfunction, it can prevent the first telescopic beam 200 from falling out of the receiving cavity 110 or from excessively contracting and causing a collision, providing a safer and more reliable guarantee to deal with emergencies and ensure the normal extension and retraction of the first telescopic beam 200. When applied to construction machinery, it can help the construction machinery complete its work or evacuate normally.

[0066] Furthermore, the fully extended limiting pin hole 203a and the fully retracted limiting pin hole 203c are located at both ends of the limiting groove 204, ensuring that the first telescopic beam 200 can be accurately and reliably locked in both extreme working positions. Moreover, it is only necessary to control the first telescopic beam 200 to extend or retract to its extreme position, and then operate the insertion and removal pin mechanism 600 to insert the pin 610, reducing reliance on sensors and providing better reliability for mechanical limiting.

[0067] The insertion / retraction pin mechanism 600 includes an insertion / retraction drive assembly 620, which drives the pin 610 to extend or retract. In some embodiments, the insertion / retraction drive assembly 620 is an electromagnetic drive assembly, a hydraulic cylinder, or a pneumatic cylinder. If the insertion / retraction drive assembly 620 is driven by an electromagnetic drive assembly, such as an electromagnet, the rapid extension and retraction of the pin 610 can be achieved by controlling the on / off state of the electromagnet. If the insertion / retraction drive assembly 620 is driven by a hydraulic cylinder, it can take advantage of the advantages of high output force and smooth operation, making it suitable for heavy-duty conditions. Of course, if conditions permit, a control air circuit or a backup air circuit can be provided, allowing the pin 610 to be driven by a pneumatic cylinder. Even in the event of a hydraulic circuit failure, the insertion / retraction pin mechanism 600 can still operate to ensure that the first telescopic beam 200 is not locked.

[0068] In some embodiments, the frame 100 is provided with a position sensor 700 for detecting the telescopic position information of the first telescopic beam 200 and the second telescopic beam 300 (e.g., ...). Figure 2 (As shown). Optionally, the position sensor 700 can be a laser displacement sensor or a cable box sensor. Taking the cable box sensor as an example, specifically, the cable box sensor is mounted on the frame 100, and the detection end of the cable box sensor is connected to the corresponding first telescopic beam 200 or second telescopic beam 300, for example, connected to the end or side of the first telescopic beam 200. The cable box sensor is used to detect the telescopic displacement information of the first telescopic beam 200 in real time. When the first telescopic beam 200 slides, it causes the cable to extend or retract, and the potentiometer or encoder inside the cable box sensor converts the displacement into an electrical signal output, thereby enabling real-time monitoring of the current position of the first telescopic beam 200. It should be understood that the above-mentioned detection by the cable box sensor in conjunction with the first telescopic beam 200 is also applicable to the second telescopic beam 300.

[0069] Thus, this embodiment, by adding a pull-wire box sensor as an auxiliary detection method on top of the locking and limiting functions provided by the aforementioned mechanical structure, can provide more status information, making it easier for operators to grasp the equipment status and achieve more intelligent control. It should be noted that even if the pull-wire box sensor malfunctions, the mechanical locking and limiting functions provided in this embodiment remain effective, ensuring the basic safety and operation of the entire machine.

[0070] Please see Figure 2 and Figure 9The first telescopic beam 200 and the second telescopic beam 300 are connected to the corresponding track frame 500 via a detachable structure 800. Taking the detachable connection between the first telescopic beam 200 and the track frame 500 as an example, the detachable structure 800 includes a wedge block 810 and a locking bolt 820. Thus, the track frame 500 has a positioning pin 510 at its bottom on the side facing the first telescopic beam 200, and the bottom of the first telescopic beam 200 away from the frame 100 has an assembly hole 205 for the positioning pin 510 to pass through. During assembly, after the locating pin 510 is inserted into the assembly hole 205, the wedge block 810 is then installed into the slot between the track frame 500 and the first telescopic beam 200. The wedge block 810 is then tightened and fixed to the mounting seat 520 on the track frame 500 using the locking bolt 820. This ensures that the upper surface of the wedge block 810 is flush against the upper surface of the slot of the track frame 500, and the lower inclined edge is flush against the inclined surface of the first telescopic beam 200. The thrust of the wedge block 810 and the cooperation of the locating pin 510 allow for a detachable connection between the first telescopic beam 200 and the track frame 500. The disassembly process of the track frame 500 also requires first lifting the track frame 500. The subsequent process is the reverse of the installation process. Then, the locking bolt 820 is loosened to remove the wedge block 810 from the slot of the track frame 500, and finally, the track frame 500 is removed. It is understandable that the above-mentioned detachable connection method between the first telescopic beam 200 and the track frame 500 also applies to the connection between the second telescopic beam 300 and the track frame 500.

[0071] In this embodiment, the tracked chassis assembly further includes a telescopic drive mechanism 900. The telescopic drive mechanism 900 is housed within the receiving cavity 110, with one end connected to the first telescopic beam 200 and the other end connected to the second telescopic beam 300. Optionally, the telescopic drive mechanism 900 may be a hydraulic cylinder or an electric cylinder, etc.

[0072] On the other hand, please see Figures 1 to 9 This embodiment also provides a type of construction machinery, including the tracked chassis assembly provided above. Specifically, the construction machinery provided in this embodiment can be a tracked crane, demolition machine, rotary drilling rig, or other tracked construction machinery that requires frequent track gauge adjustments.

[0073] The engineering machinery provided in this embodiment has the following advantages: 1. The engineering machinery provided in this embodiment uses the tracked chassis assembly provided above, which can realize process automation and telescopic adjustment of the multi-gauge track frame 500. This adjustment can be unilateral adjustment, bilateral adjustment, on-the-spot adjustment or adjustment while moving, etc. 2. During long-distance transport, the track frame can be quickly and efficiently disassembled and assembled (500mm). 3. The position of the limiting plate 410 can be adjusted by tightening or loosening the adjusting bolt 421 to reduce or increase the clearance between the limiting plate 410 and the first telescopic beam 200 and the second telescopic amount. For example, by increasing the clearance, it is easier to install and disassemble the first telescopic beam 200 and the second telescopic beam 300, and to facilitate maintenance; by decreasing the clearance, the first telescopic beam 200 and the second telescopic beam 300 can move more smoothly during the telescopic process, making the vehicle's driving, braking and track changing smoother. 4. By providing the first insertion part 210 and the second insertion part 310, when the first telescopic beam 200 and the second telescopic beam 300 are fully retracted, the second telescopic beam 300 at least partially overlaps with the first telescopic beam 200, and the first telescopic beam 200 and the second telescopic beam 300 do not contact each other during the telescopic process, thereby eliminating the relative friction between the two telescopic beams and the accompanying friction noise problem during the telescopic process. 5. When the first telescopic beam 200 and the second telescopic beam 300 are fully retracted, the first telescopic beam 200 and the second telescopic beam 300 overlap only partially (first insertion part 210 and second insertion part 310). Compared with the scheme where the telescopic beams in the same cavity do not overlap at all when fully retracted, the first telescopic beam 200 and the second telescopic beam 300 provided in this embodiment allow for a significantly larger extension. Compared with the telescopic beam scheme where they completely overlap in the same cavity, this embodiment has lower processing requirements for the frame 100 and is easier to implement.

[0074] 6. In this embodiment, a large telescopic stroke is achieved by the plug-in cooperation of the first plug-in part 210 and the second plug-in part 310. At the same time, the first open section 211 and the second open section 311 are set without cover plates, so that the first telescopic beam 200 and the second telescopic beam 300 are lighter than other solutions that meet the same conditions. 7. While achieving a large telescopic stroke, when the first telescopic beam 200 and the second telescopic beam 300 are fully retracted, only part of the bottom plate and side plate of the second telescopic beam 300 extend into the accommodating space 200a of the first telescopic beam 200. Therefore, both the first telescopic beam 200 and the second telescopic beam 300 used in this embodiment can be equipped with a reinforcing rib structure, ensuring structural strength and minimizing bending deformation. Compared with the beams used in other schemes that meet the same conditions, the rigidity is better. 8. The mechanical limiting measures of the limiting pin hole 203 and the pin 610 in the limiting slide groove 204 ensure that even if the telescopic drive mechanism 900 loses control and cannot stop the telescopic action normally, the first telescopic beam 200 and the second telescopic beam 300 will not be forcibly pushed out or pulled into the frame 100. There is no need to add a pull plate limiting device to the outside of the frame 100 and the first telescopic beam 200 and the second telescopic beam 300 or the track frame 500.

[0075] It should be noted that, in this application, unless otherwise stated, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0076] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0077] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0079] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A tracked chassis assembly, characterized in that, Includes a chassis (100), a track frame (500), a first telescopic beam (200), and a second telescopic beam (300); The vehicle frame (100) has a through-hole (110) along its width direction and the track frame (500) is arranged on both sides. The first telescopic beam (200) and the second telescopic beam (300) are aligned and inserted into the through-hole (110) and connected to the track frame (500) on the corresponding side. The first telescopic beam (200) has a first cover plate (202) and the second telescopic beam (300) has a second cover plate (302). The top surfaces of the first cover plate (202) and the second cover plate (302) are flush, and / or the two sides of the first cover plate (202) and the second cover plate (302) are flush. The first telescopic beam (200) and the second telescopic beam (300) are respectively provided with a first insertion part (210) and a second insertion part (310) at opposite ends. When the first telescopic beam (200) and the second telescopic beam (300) are in a fully retracted state, the second insertion part (310) is inserted into the first insertion part (210) and forms a clearance fit.

2. The tracked chassis assembly according to claim 1, characterized in that, The first telescopic beam (200) has a receiving space (200a) at one end near the second telescopic beam (300) for the second plug-in part (310) to be inserted. When the first telescopic beam (200) and the second telescopic beam (300) are in the fully retracted state, the second plug-in part (310) is housed in the accommodating space (200a) and is in clearance fit with the accommodating space (200a), while the second cover plate (302) is exposed outside the accommodating space (200a).

3. The tracked chassis assembly according to claim 2, characterized in that, The bottom of the receiving cavity (110) is provided with a first shim (120) for supporting the sliding of the first telescopic beam (200) and a second shim (130) for supporting the sliding of the second telescopic beam (300). The thickness of the first shim (120) is h1, the thickness of the second shim (130) is h2, and the height from the bottom surface of the receiving space (200a) to the top surface of the first shim (120) is h3. Among them, the following condition is met: h1 + h3 < h2.

4. The tracked chassis assembly according to claim 2, characterized in that, Along the width direction of the accommodating space (200a), the first telescopic beam (200) further includes two oppositely arranged first side plates (201), and the second telescopic beam (300) further includes two oppositely arranged second side plates (301). In the first insertion part (210), the distance between the inner walls of the two first side plates (201) is W1; in the second insertion part (310), the distance between the outer walls of the two second side plates (301) is W2, satisfying: W1 > W2.

5. The tracked chassis assembly according to claim 2, characterized in that, The first plug-in portion (210) is provided with a first open section (211) and a first receiving section in sequence from the direction away from the second telescopic beam (300). The first open section (211) communicates with the receiving section to form the accommodating space (200a). One end of the first cover plate (202) extends and covers the top of the first receiving section. The top of the first open section (211) is an open section. The second plug-in portion (310) is provided with a second open section (311) and a second receiving section in sequence from the direction away from the first telescopic beam (200). One end of the second cover plate (302) extends and covers the top of the second receiving section. The top of the second open section (311) is open. When the first telescopic beam (200) and the second telescopic beam (300) are in a fully retracted state, the second open section (311) is housed within the first housing section, and the second housing section is located within the first open section (211).

6. The tracked chassis assembly according to claim 5, characterized in that, The first open section (211) has a first wedge-shaped notch (201a) above the end near the second telescopic beam (300); And / or, the second open section (311) has a second wedge-shaped notch above one end near the first telescopic beam (200).

7. The tracked chassis assembly according to claim 1, characterized in that, With the two sides of the first cover plate (202) and the second cover plate (302) flush, the tracked chassis assembly also includes a clearance adjustment mechanism (400). The receiving cavity (110) is provided with the gap adjustment mechanism (400) on both sides. The gap adjustment mechanism (400) is provided on the side of the first cover plate (202) and the second cover plate (302) and is used to adjust the size of the movable gap between the first cover plate (202) and the second cover plate (302) in the receiving cavity (110).

8. The tracked chassis assembly according to claim 7, characterized in that, The gap adjustment mechanism (400) includes a limiting plate (410) and a push adjustment assembly (420). The limiting plate (410) is arranged in the receiving cavity (110); The push adjustment assembly (420) is disposed on the frame (100) and movably connected to the limiting plate (410). The push adjustment assembly (420) is used to drive the limiting plate (410) to move and adjust along the width direction of the receiving cavity (110).

9. The tracked chassis assembly according to any one of claims 1-8, characterized in that, The frame (100) is provided with a pin insertion mechanism (600) corresponding to the first telescopic beam (200) and the second telescopic beam (300), respectively. The pin (610) of the pin insertion mechanism (600) extends into the receiving cavity (110). The first telescopic beam (200) and the second telescopic beam (300) are provided with a plurality of limiting pin holes (203) for the pin (610) to be inserted and cooperated with along their own telescopic direction. And / or, the first telescopic beam (200) and the second telescopic beam (300) are provided with a limiting slide groove (204) along their own telescopic direction. The pin (610) is at least partially inserted into the limiting slide groove (204). The bottom of the limiting slide groove (204) is provided with a plurality of limiting pin holes (203) for the pin (610) to be inserted and cooperated with. And / or, the frame (100) is provided with a position sensor (700) for detecting the telescopic position information of the first telescopic beam (200) and the second telescopic beam (300).

10. An engineering machinery, characterized in that, Includes the tracked chassis assembly according to any one of claims 1-9.

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