Variable gauge telescopic chassis of excavator and excavator

Abstract

The variable-gauge telescopic chassis is installed at the bottom of the excavator and comprises a middle frame, a dozer blade, telescopic walking assemblies, limiting assemblies and telescopic oil cylinders, the dozer blade is installed at the front end of the middle frame, and the telescopic walking assemblies are symmetrically arranged on the two sides of the middle frame; the limiting assembly is arranged on the middle frame and slidably connected with the telescopic walking assembly. The telescopic oil cylinders are symmetrically arranged in the middles of the two sides of the middle frame and connected with the telescopic walking assembly. The bulldozing shovel comprises a supporting frame, a bulldozing shovel oil cylinder, a main bucket, folding shovels and a connecting assembly, the bulldozing shovel oil cylinder is arranged in the middle of the supporting frame, the main bucket is arranged on the supporting frame, and the folding shovels are symmetrically arranged on the two sides of the supporting frame through the connecting assembly. The whole structure is simple, the vehicle body and the bucket can be adjusted according to requirements, the operation efficiency is effectively improved, meanwhile, it can be ensured that the vehicle can smoothly pass through a narrow space for operation, and the operation cost and the transportation cost are effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of excavators, and particularly relates to a variable-gauge telescopic chassis of an excavator and the excavator. BACKGROUND

[0002] The excavator chassis (also known as a support seat) is a core structural component of a crawler-type excavator, which is manufactured by integral welding process, bears the weight of the whole machine and transmits the working load. When transporting, the transportation cost is different due to the different sizes of the transportation vehicles, and the transportation cost of the super-wide excavator is increased. When working, a plurality of excavators with different sizes are needed to work due to the irregular working site, thereby increasing the working cost. SUMMARY

[0003] To at least partially solve the technical problems existing in the prior art, the present application provides a variable-gauge telescopic chassis of an excavator and the excavator.

[0004] In one aspect of the present application, a variable-gauge telescopic chassis of an excavator is provided, which comprises a middle frame, a bulldozing shovel, a telescopic walking assembly, a limiting assembly and a telescopic oil cylinder. The bulldozing shovel is installed at the front end of the middle frame. The telescopic walking assembly is symmetrically arranged on both sides of the middle frame. The limiting assembly is arranged on the middle frame and is in sliding connection with the telescopic walking assembly, and is used for limiting the telescoping of the telescopic walking assembly. The telescopic oil cylinder is symmetrically arranged at the middle part of the middle frame and is connected with the telescopic walking assembly, and is used for providing driving force to the telescopic walking assembly. Wherein:

[0005] The bulldozing shovel comprises a support frame, a bulldozing shovel oil cylinder, a main bucket, a folding shovel and a connecting assembly. The bulldozing shovel oil cylinder is arranged at the middle part of the support frame and is used for providing rotating force to the support frame. The main bucket is arranged on the support frame. The folding shovel is symmetrically arranged on both sides of the support frame through the connecting assembly.

[0006] The telescopic walking assembly comprises a track beam, a front sliding rail, a rear sliding rail, a limiting table, a walking motor and a track. The output end of the telescopic oil cylinder is fixedly connected with the track beam. The front sliding rail is arranged at one side of the front end of the track beam. The rear sliding rail is arranged at one side of the rear end of the track beam. The limiting table is arranged on the upper side of one end of the front sliding rail and the rear sliding rail close to the track beam, respectively. The walking motor is arranged at the rear end of the track beam. The track is arranged on the walking motor and the track beam.

[0007] Further, in the variable gauge telescopic chassis of the excavator, four telescopic grooves are symmetrically arranged inside the left and right sides of the middle frame, the front slide rail and the rear slide rail are respectively connected with the telescopic grooves in a sliding manner, the limiting table is in abutment with the middle frame, the first threaded hole is arranged through the upper end of the middle frame corresponding to the telescopic groove, the second threaded hole is arranged through the rear end of the middle frame corresponding to the telescopic groove, the hinged table is arranged in the middle of the front end of the middle frame, the support frame is hinged with the middle frame, the bulldozing bucket oil cylinder is hinged with the hinged table, and the output end of the bulldozing bucket oil cylinder is hinged with the middle of the support frame.

[0008] Further, in the variable gauge telescopic chassis of the excavator, the limiting assembly comprises a limiting bolt and a locking bolt, the front slide rail and the rear slide rail are each provided with a long sliding groove, the limiting bolt is in threaded engagement with the first threaded hole, the limiting bolt is in sliding connection with the long sliding groove at the end thereof, the locking bolt is in threaded engagement with the second threaded hole, and the locking bolt is in abutment with the rear slide rail at the end thereof.

[0009] Further, in the variable gauge telescopic chassis of the excavator, the connecting assembly comprises a folding frame, a pin shaft, a clamping table, a threaded table, a connecting table and a connecting bolt, the folding bucket is welded with the folding frame, the folding frame is hinged with the support frame through the pin shaft, the clamping table is welded on the side of the support frame close to the folding frame and is in abutment when the folding frame is unfolded, the threaded table is welded on the support frame, the connecting table is welded on the folding frame, and the connecting bolt is in threaded engagement with the threaded table through the connecting table when the folding frame is unfolded.

[0010] Further, in the variable gauge telescopic chassis of the excavator, a hydraulic system is further included, the hydraulic system comprises a central rotation hydraulic interface, a hydraulic pipe fixing support, a bulldozing bucket hydraulic pipe, a telescopic oil cylinder hydraulic pipe and a hydraulic motor hydraulic pipe, the central rotation hydraulic interface is installed in the middle of the mounting frame and is used for providing high-pressure hydraulic oil, the hydraulic pipe fixing support is symmetrically arranged on both sides of the hinged table, one end of the bulldozing bucket hydraulic pipe is connected with the central rotation hydraulic interface, the other end of the bulldozing bucket hydraulic pipe is sequentially connected with the bulldozing bucket oil cylinder through the middle frame and the hydraulic pipe fixing support, one end of the telescopic oil cylinder hydraulic pipe is connected with the central rotation hydraulic interface, the other end of the telescopic oil cylinder hydraulic pipe is connected with the telescopic oil cylinder through the middle frame, one end of the hydraulic motor hydraulic pipe is connected with the central rotation hydraulic interface, and the other end of the hydraulic motor hydraulic pipe is sequentially connected with the hydraulic motor through the middle frame, the telescopic groove, the rear slide rail and the track beam.

[0011] In another aspect of the present application, a kind of excavator is provided, the excavator bottom is equipped with the variable track pitch telescopic chassis described above, including middle frame, bulldozing shovel, telescopic walking component, limiting component and telescopic oil cylinder, the bulldozing shovel is installed in the middle frame front end, the telescopic walking component is symmetrically arranged in the middle piece both sides, the limiting component is arranged on the middle frame with the telescopic walking component sliding connection, for the telescopic walking component telescopic limiting, the telescopic oil cylinder is symmetrically arranged in the middle frame both sides middle part and is connected with the telescopic walking component, for the telescopic walking component provides driving force, wherein:

[0012] The bulldozing shovel includes support frame, bulldozing shovel oil cylinder, main shovel, folding shovel and connecting component, the bulldozing shovel oil cylinder is arranged in the middle of the support frame, for the support frame provides rotating force, the main shovel is arranged on the support frame, the folding shovel is symmetrically arranged on the both sides of the support frame by the connecting component;

[0013] The telescopic walking component includes track beam, front slide rail, rear slide rail, limiting table, walking motor and track, the telescopic oil cylinder output end is fixedly connected with the track beam, the front slide rail is arranged on one side of the front end of the track beam, the rear slide rail is arranged on one side of the rear end of the track beam, the limiting table is respectively arranged on the upper side of one end of the front slide rail and the rear slide rail close to the track beam, the walking motor is arranged on the rear end of the track beam, and the track is arranged on the walking motor and the track beam.

[0014] Further, in the above excavator, four telescopic grooves are symmetrically arranged in the left and right sides of the middle frame, the front slide rail and the rear slide rail are respectively slidably connected with the telescopic grooves, the limiting table abuts against the middle frame, first threaded holes are formed through the middle frame corresponding to the telescopic grooves on the upper end of the middle frame, second threaded holes are formed through the middle frame corresponding to the telescopic grooves on the rear end of the middle frame, a hinged table is arranged on the middle part of the front end of the middle frame, the support frame is hinged to the middle frame, the bulldozing shovel oil cylinder is hinged to the hinged table, and the output end of the bulldozing shovel oil cylinder is hinged to the middle part of the support frame.

[0015] Further, in the above excavator, the limiting component includes a limiting bolt and a locking bolt, a long sliding groove is arranged on the front slide rail and the rear slide rail, the limiting bolt is threadedly engaged with the first threaded hole, the end of the limiting bolt is slidably connected with the long sliding groove, the locking bolt is threadedly engaged with the second threaded hole, and the end of the locking bolt abuts against the rear slide rail.

[0016] Further, in the excavator, the connecting assembly comprises a folding frame, a pin shaft, a clamping table, a threaded table, a connecting table and a connecting bolt, the folding bucket is welded with the folding frame, the folding frame is hinged with the support frame through the pin shaft, the clamping table is welded on the support frame close to the folding frame and abuts when the folding frame is unfolded, the threaded table is welded on the support frame, the connecting table is welded on the folding frame, and the connecting bolt is screwed with the threaded table through the connecting table when the folding frame is unfolded.

[0017] Further, in the excavator, a hydraulic system is further included, the hydraulic system comprises a central rotation hydraulic interface, a hydraulic pipe fixing support, a bulldozing bucket hydraulic pipe, an extension oil cylinder hydraulic pipe and a hydraulic motor hydraulic pipe, the central rotation hydraulic interface is installed in the middle of the mounting frame to provide high-pressure hydraulic oil, the hydraulic pipe fixing supports are symmetrically arranged on both sides of the hinged table, one end of the bulldozing bucket hydraulic pipe is connected with the central rotation hydraulic interface, the other end of the bulldozing bucket hydraulic pipe is sequentially connected with the bulldozing bucket oil cylinder through the intermediate frame and the hydraulic pipe fixing support, one end of the extension oil cylinder hydraulic pipe is connected with the central rotation hydraulic interface, the other end of the extension oil cylinder hydraulic pipe is connected with the extension oil cylinder through the intermediate frame, one end of the hydraulic motor hydraulic pipe is connected with the central rotation hydraulic interface, and the other end of the hydraulic motor hydraulic pipe is sequentially connected with the hydraulic motor through the intermediate frame, the extension groove, the rear sliding rail and the track beam.

[0018] The excavator with the variable-gauge telescopic chassis has the following advantages and beneficial effects:

[0019] The excavator has simple overall structure, the vehicle body and the bucket can be adjusted according to requirements through the telescopic walking assembly and the folding bucket, the working efficiency is effectively improved, the work can be smoothly carried out in a small space, and the work cost and the transportation cost are effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only used to further understand the embodiments of the present application and form a part of the present application. For those skilled in the art, other drawings can also be obtained without creative labor based on these drawings. In the drawings:

[0021] Figure 1 It is an overall structure schematic view of the variable-gauge telescopic chassis of the excavator.

[0022] Figure 2The rear structure schematic diagram of the excavator's variable gauge telescopic chassis's telescopic walking assembly after removing the walking motor and the track;

[0023] Figure 3 The rear structure schematic diagram of the excavator's variable gauge telescopic chassis's bulldozing blade after removing the bulldozing blade oil cylinder, wherein the folding blade is in the unfolded state;

[0024] Figure 4 The rear structure schematic diagram of the excavator's variable gauge telescopic chassis's bulldozing blade after removing the bulldozing blade oil cylinder, wherein the folding blade is in the folded state;

[0025] Figure 5 The hydraulic system distribution structure schematic diagram of the excavator's variable gauge telescopic chassis.

[0026] Explanation of reference signs:

[0027] 1: intermediate frame, 11: telescopic groove, 12: first threaded hole, 13: second threaded hole, 14: hinged table;

[0028] 2: bulldozing blade, 21: support frame, 22: bulldozing blade oil cylinder, 23: main bucket, 24: folding blade;

[0029] 25: connecting assembly, 251: folding frame, 252: pin shaft, 253: clamping table, 254: threaded table, 255: connecting table, 256: connecting bolt;

[0030] 3: telescopic walking assembly, 31: track beam, 32: front sliding rail, 33: rear sliding rail, 34: limiting table, 35: walking motor, 36: track, 37: long sliding groove;

[0031] 4: limiting assembly, 41: limiting bolt, 42: locking bolt;

[0032] 5: telescopic oil cylinder;

[0033] 6: hydraulic system, 61: central rotation hydraulic interface, 62: hydraulic pipe fixing support, 63: bulldozing blade hydraulic pipe, 64: telescopic oil cylinder hydraulic pipe, 65: hydraulic motor hydraulic pipe. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] AsFigures 1 to 5 As shown in one aspect of the present application, a variable gauge telescopic chassis of excavator is provided, which comprises a middle frame 1, a dozing bucket 2, a telescopic walking assembly 3, a limiting assembly 4 and a telescopic oil cylinder 5. The dozing bucket 2 is installed at the front end of the middle frame 1. The telescopic walking assembly 3 is symmetrically arranged on both sides of the middle frame. The limiting assembly 4 is arranged on the middle frame 1 and is in sliding connection with the telescopic walking assembly 3, for limiting the telescopic walking assembly 3. The telescopic oil cylinder 5 is symmetrically arranged at the middle part of the middle frame 1 and is connected with the telescopic walking assembly 3, for providing driving force to the telescopic walking assembly 3. Wherein:

[0036] The dozing bucket 2 comprises a support frame 21, a dozing bucket oil cylinder 22, a main bucket 23, a folding bucket 24 and a connecting assembly 25. The dozing bucket oil cylinder 22 is arranged at the middle part of the support frame 21, for providing rotating force to the support frame 21. The main bucket 23 is arranged on the support frame 21. The folding bucket 24 is symmetrically arranged on both sides of the support frame 21 through the connecting assembly 25.

[0037] The telescopic walking assembly 3 comprises a track beam 31, a front sliding rail 32, a rear sliding rail 33, a limiting table 34, a walking motor 35 and a track 36. The output end of the telescopic oil cylinder 5 is fixedly connected with the track beam 31. The front sliding rail 32 is arranged at one side of the front end of the track beam 31. The rear sliding rail 33 is arranged at one side of the rear end of the track beam 31. The limiting table 34 is arranged on the upper side of the end of the front sliding rail 32 and the rear sliding rail 33 close to the track beam 31, respectively. The walking motor 35 is arranged at the rear end of the track beam 31. The track 36 is arranged on the walking motor 35 and the track beam 31.

[0038] Further, in the variable gauge telescopic chassis of excavator of the present application, four telescopic grooves 11 are symmetrically arranged in the inside of the left and right sides of the middle frame 1. The front sliding rail 32 and the rear sliding rail 33 are in sliding connection with the telescopic grooves 11, respectively. The limiting table 34 is in abutment with the middle frame 1. The first threaded hole 12 is arranged in the middle frame 1 and penetrates through the upper end of the middle frame 1 corresponding to the telescopic groove 11. The second threaded hole 13 is arranged in the middle frame 1 and penetrates through the rear end of the middle frame 1 corresponding to the telescopic groove 11. The hinged table 14 is arranged in the middle frame 1 and corresponds to the front end of the middle frame 1. The support frame 21 is hinged with the middle frame 1. The dozing bucket oil cylinder 22 is hinged with the hinged table 14. The output end of the dozing bucket oil cylinder 22 is hinged with the middle part of the support frame 21, so as to ensure that the middle frame 1 has telescopic function and can be connected with the dozing bucket 2.

[0039] Further, in the variable track width telescopic chassis of the excavator, the limiting assembly 4 comprises a limiting bolt 41 and a locking bolt 42, the front slide rail 32 and the rear slide rail 33 are provided with a long sliding groove 37, the limiting bolt 41 is threadedly engaged with the first threaded hole 12, the end of the limiting bolt 41 is slidably connected with the long sliding groove 37, the locking bolt 42 is threadedly engaged with the second threaded hole 13, and the end of the locking bolt 42 is in abutment with the rear slide rail 33, so that when the front slide rail 32 and the rear slide rail 33 slide in the telescopic slot 11 respectively, the telescopic length can be effectively limited through the cooperation of the limiting bolt 41 and the long sliding groove 37, and the front slide rail 32 and the rear slide rail 33 are prevented from being pulled out of the telescopic slot 11, and after the telescopic distance adjustment is completed, the rear slide rail 33 is locked through the locking bolt 42, so that the chassis track width is prevented from changing during operation.

[0040] Further, in the variable track width telescopic chassis of the excavator, the connecting assembly 25 comprises a folding frame 251, a pin shaft 252, a clamping table 253, a threaded table 254, a connecting table 255 and a connecting bolt 256, the folding shovel 24 is welded with the folding frame 251, the folding frame 251 is hinged with the support frame 21 through the pin shaft 252, the clamping table 253 is welded on the side of the support frame 21 close to the folding frame 251 and is in abutment when the folding frame 251 is unfolded, the threaded table 254 is welded on the support frame 21, the connecting table 255 is welded on the folding frame 251, and the connecting bolt 256 is threadedly engaged with the threaded table 254 through the connecting table 255 when the folding frame 251 is unfolded, so that the folding shovel 24 can be switched with the change of the chassis track width, ensuring that the excavator can work in a small space and improving the work efficiency in a larger work space.

[0041] Further, in the variable track width telescopic chassis of the excavator, the hydraulic system 6 comprises a central rotary hydraulic interface 61, a hydraulic pipe fixing support 62, a bulldozing shovel hydraulic pipe 63, a telescopic oil cylinder hydraulic pipe 64 and a hydraulic motor hydraulic pipe 65, the central rotary hydraulic interface 61 is installed in the middle of the mounting frame and is used to provide high-pressure hydraulic oil, the hydraulic pipe fixing support 62 is symmetrically arranged on both sides of the hinged table 14, one end of the bulldozing shovel hydraulic pipe 63 is connected with the central rotary hydraulic interface 61, the other end of the bulldozing shovel hydraulic pipe 63 is sequentially connected with the bulldozing shovel oil cylinder 22 through the intermediate frame 1 and the hydraulic pipe fixing support 62, one end of the telescopic oil cylinder hydraulic pipe 64 is connected with the central rotary hydraulic interface 61, the other end of the telescopic oil cylinder hydraulic pipe 64 is connected with the telescopic oil cylinder 5 through the intermediate frame 1, one end of the hydraulic motor hydraulic pipe 65 is connected with the central rotary hydraulic interface 61, and the other end of the hydraulic motor hydraulic pipe 65 is sequentially connected with the hydraulic motor through the intermediate frame 1, the telescopic slot 11, the rear slide rail 33 and the track beam 31, so that the hydraulic pipeline can be supplied with oil in a short distance and is stored in the chassis, effectively improving the service life.

[0042] In another aspect of the present application, the provided excavator is mounted with the above-mentioned variable gauge retractable chassis.

[0043] The variable gauge retractable chassis of the excavator of the present application and the working process of the excavator using the same are as follows:

[0044] When the maximum gauge of the chassis is adjusted, the locking bolt 42 is first adjusted to ensure that the rear sliding rail 33 is in the middle position of the retracting groove 11, at this time the retracting oil cylinder 5 is started to push the crawler beam 31 to expand to both sides, while the front sliding rail 32 and the rear sliding rail 33 smoothly slide in the retracting groove 11, and the limiting bolt 41 slides in the long sliding groove 37, when the limiting bolt 41 coincides with the edge position of the long sliding groove 37, the retracting oil cylinder 5 is fully extended, at this time the chassis gauge is locked by the double action of the retracting oil cylinder 5 and the limiting bolt 41, and the rear sliding rail 33 is further locked by the locking bolt 42, the crawler beam 31 is in the maximum expansion position, at this time the efficiency of the bulldozing action needs to be improved, such as Figure 4 As shown, the folding frame 251 is opened and the clamping table 253 abuts against the folding frame 251, and the folding frame 251 is connected with the supporting frame 21 through the pin shaft 252, at this time the folding frame 251 is fastened through the connecting bolt 256 passing through the connecting table 255 and the threaded table 254, so as to adjust the gap between the folding shovel 24 and the main bucket 23, and ensure the efficient operation of the bulldozing shovel 2;

[0045] When the minimum gauge of the chassis is adjusted, the locking bolt 42 is first adjusted to ensure that the rear sliding rail 33 is in the middle position of the retracting groove 11, at this time the retracting oil cylinder 5 is started to drive the crawler beam 31 to be retracted to the middle frame 1, while the front sliding rail 32 and the rear sliding rail 33 smoothly slide in the retracting groove 11, and the limiting bolt 41 slides in the long sliding groove 37, when the limiting bolt 41 coincides with the other edge position of the long sliding groove 37, the limiting table 34 abuts against the middle frame 1, and the retracting oil cylinder 5 is fully retracted, at this time the chassis gauge is locked by the action of the retracting oil cylinder 5, the limiting bolt 41 and the limiting table 34, and the rear sliding rail 33 is further locked by the locking bolt 42, the crawler beam 31 is in the minimum expansion position, at this time in order to ensure that the excavator can enter the narrow space for operation, such as Figure 5 As shown, the folding frame 251 is accommodated in the back of the supporting frame 21, the clamping table 253 abuts against the folding frame 251, and the folding frame 251 is connected with the supporting frame 21 through the pin shaft 252, at this time the folding frame 251 is fastened to ensure that the excavator passes smoothly.

[0046] Compared with the prior art, the variable-gauge telescopic chassis of the excavator and the excavator have the following advantages and beneficial effects: the overall structure is simple, the vehicle body and the bucket can be adjusted according to requirements through the arrangement of the telescopic walking assembly and the folding shovel, the working efficiency is effectively improved, the smooth operation in a small space can be ensured, and the operation cost and the transportation cost are effectively reduced.

[0047] It should be noted that, in this document, unless otherwise explicitly specified and limited, the term "connection" or its synonyms should be understood broadly, for example, the "connection" can be a fixed connection or a detachable connection; can be a mechanical connection or an electrical connection; can be direct connection or indirect connection through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements, and those skilled in the art can understand the specific meaning of the above-mentioned term in the present application according to the specific circumstances. Moreover, expressions such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. At the same time, the term "includes", "contains" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. In addition, "front", "back", "left", "right", "up", "down" in this document are referred to the placement state shown in the drawings.

[0048] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A variable-gauge telescopic undercarriage of a shovel, which is installed at the bottom of a shovel, characterized by, The variable track pitch telescopic chassis comprises a middle frame, a bulldozing blade, telescopic walking assemblies, limiting assemblies and telescopic oil cylinders, the bulldozing blade is installed at the front end of the middle frame, the telescopic walking assemblies are symmetrically arranged on both sides of the middle frame, the limiting assemblies are arranged on the middle frame and are in sliding connection with the telescopic walking assemblies, and are used for limiting the telescopic walking assemblies, the telescopic oil cylinders are symmetrically arranged on both sides of the middle frame and are connected with the telescopic walking assemblies, and are used for providing driving force for the telescopic walking assemblies, wherein: The bulldozing blade comprises a supporting frame, a bulldozing blade oil cylinder, a main bucket, a folding bucket and a connecting assembly, the bulldozing blade oil cylinder is arranged in the middle of the supporting frame and is used for providing rotating force for the supporting frame, the main bucket is arranged on the supporting frame, and the folding bucket is symmetrically arranged on both sides of the supporting frame through the connecting assembly. The telescopic walking assembly comprises a track beam, a front sliding rail, a rear sliding rail, a limiting table, a walking motor and a track, the output end of the telescopic oil cylinder is fixedly connected with the track beam, the front sliding rail is arranged on one side of the front end of the track beam, the rear sliding rail is arranged on one side of the rear end of the track beam, the limiting tables are respectively arranged on the upper sides of the ends of the front sliding rail and the rear sliding rail close to the track beam, the walking motor is arranged at the rear end of the track beam, and the track is arranged on the walking motor and the track beam.

2. The variable-gauge, telescoping undercarriage of a excavator of claim 1, wherein, The inner sides of the left and right sides of the middle frame are symmetrically provided with four telescopic grooves, the front sliding rail and the rear sliding rail are respectively in sliding connection with the telescopic grooves, the limiting tables abut against the middle frame, first threaded holes are arranged in the middle frame and penetrate the upper ends of the telescopic grooves, second threaded holes are arranged in the middle frame and penetrate the rear ends of the telescopic grooves, a hinged table is arranged in the middle of the front end of the middle frame, the supporting frame is hinged to the middle frame, and the bulldozing blade oil cylinder is hinged to the hinged table.

3. The variable-gauge, telescoping undercarriage of a excavator of claim 2, wherein, The limiting assembly comprises a limiting bolt and a locking bolt, long sliding grooves are arranged on the front sliding rail and the rear sliding rail, the limiting bolt is in threaded engagement with the first threaded hole, the limiting bolt is in sliding connection with the long sliding groove at the tail end, the locking bolt is in threaded engagement with the second threaded hole, and the tail end of the locking bolt abuts against the rear sliding rail.

4. The variable-gauge, telescoping undercarriage of a excavator of claim 1, wherein, The connecting assembly comprises a folding frame, a pin shaft, a clamping table, a threaded table, a connecting table and a connecting bolt, the folding bucket is welded to the folding frame, the folding frame is hinged to the supporting frame through the pin shaft, the clamping table is welded to one side of the supporting frame close to the folding frame and abuts against the folding frame when the folding frame is unfolded, the threaded table is welded to the supporting frame, the connecting table is welded to the folding frame, and the connecting bolt is in threaded engagement with the threaded table through the connecting table when the folding frame is unfolded.

5. The variable-gauge, telescoping undercarriage of a excavator of claim 2, wherein, Further comprise hydraulic system, the hydraulic system includes central rotation hydraulic interface, hydraulic pipe fixed support, bulldozer hydraulic pipe, telescopic oil cylinder hydraulic pipe and hydraulic motor hydraulic pipe, the central rotation hydraulic interface is installed in the middle of the mounting frame, for providing high pressure hydraulic oil, the hydraulic pipe fixed support is symmetrically arranged on both sides of the articulated platform, one end of the bulldozer hydraulic pipe is connected with the central rotation hydraulic interface, the other end of the bulldozer hydraulic pipe sequentially passes through the intermediate frame and hydraulic pipe fixed support and is connected with the bulldozer oil cylinder, one end of the telescopic oil cylinder hydraulic pipe is connected with the central rotation hydraulic interface, the other end of the telescopic oil cylinder hydraulic pipe passes through the intermediate frame and is connected with the telescopic oil cylinder, one end of the hydraulic motor hydraulic pipe is connected with the central rotation hydraulic interface, the other end of the hydraulic motor hydraulic pipe sequentially passes through the intermediate frame, the telescopic groove, the rear slide rail and the track beam and is connected with the hydraulic motor.

6. An excavator having a variable-gauge telescoping undercarriage mounted at the bottom thereof, characterized by, The variable track width telescopic chassis comprises an intermediate frame, a bulldozer, a telescopic walking assembly, a limiting assembly and a telescopic oil cylinder, the bulldozer is installed at the front end of the intermediate frame, the telescopic walking assembly is symmetrically arranged on both sides of the intermediate frame, the limiting assembly is arranged on the intermediate frame and is slidably connected with the telescopic walking assembly, for limiting the telescopic walking assembly, the telescopic oil cylinder is symmetrically arranged in the middle of both sides of the intermediate frame and is connected with the telescopic walking assembly, for providing driving force to the telescopic walking assembly, wherein: The bulldozer comprises a support frame, a bulldozer oil cylinder, a main bucket, a folding bucket and a connecting assembly, the bulldozer oil cylinder is arranged in the middle of the support frame, for providing rotating force to the support frame, the main bucket is arranged on the support frame, the folding bucket is symmetrically arranged on both sides of the support frame through the connecting assembly; The telescopic walking assembly comprises a track beam, a front slide rail, a rear slide rail, a limiting platform, a walking motor and a track, the output end of the telescopic oil cylinder is fixedly connected with the track beam, the front slide rail is arranged on one side of the front end of the track beam, the rear slide rail is arranged on one side of the rear end of the track beam, the limiting platform is arranged on the upper side of one end of the front slide rail and the rear slide rail close to the track beam respectively, the walking motor is arranged at the rear end of the track beam, and the track is arranged on the walking motor and the track beam.

7. The excavator of claim 6, wherein, The inner sides of the left and right sides of the intermediate frame are symmetrically provided with four telescopic grooves, the front slide rail and the rear slide rail are slidably connected with the telescopic grooves respectively, the limiting platform abuts against the intermediate frame, the first threaded hole is arranged through the upper end of the intermediate frame corresponding to the telescopic groove, the second threaded hole is arranged through the rear end of the intermediate frame corresponding to the telescopic groove, the articulated platform is arranged in the middle of the front end of the intermediate frame, the support frame is articulated with the intermediate frame, the bulldozer oil cylinder is articulated with the articulated platform, and the output end of the bulldozer oil cylinder is articulated with the middle of the support frame.

8. The excavator of claim 7, wherein, The limiting assembly comprises a limiting bolt and a locking bolt, long sliding grooves are arranged on the front sliding rail and the rear sliding rail, the limiting bolt is in threaded engagement with the first threaded hole, the limiting bolt is in sliding connection with the long sliding groove at the end, the locking bolt is in threaded engagement with the second threaded hole, and the locking bolt is in abutment with the rear sliding rail at the end.

9. The excavator of claim 6, wherein, The connecting assembly comprises a folding frame, a pin shaft, a clamping table, a threaded table, a connecting table and a connecting bolt, the folding shovel is welded with the folding frame, the folding frame is hinged with the support frame through the pin shaft, the clamping table is welded on the side of the support frame close to the folding frame and abuts against the folding frame when the folding frame is unfolded, the threaded table is welded on the support frame, the connecting table is welded on the folding frame, and the connecting bolt is in threaded engagement with the threaded table through the connecting table when the folding frame is unfolded.

10. The excavator of claim 7, wherein, The hydraulic system comprises a central rotation hydraulic interface, a hydraulic pipe fixing support, a bulldozing shovel hydraulic pipe, an extension oil cylinder hydraulic pipe and a hydraulic motor hydraulic pipe, the central rotation hydraulic interface is installed in the middle of the mounting frame and is used for providing high-pressure hydraulic oil, the hydraulic pipe fixing supports are symmetrically arranged on both sides of the hinged table, one end of the bulldozing shovel hydraulic pipe is connected with the central rotation hydraulic interface, the other end of the bulldozing shovel hydraulic pipe is sequentially connected with the bulldozing shovel oil cylinder through the intermediate frame and the hydraulic pipe fixing support, one end of the extension oil cylinder hydraulic pipe is connected with the central rotation hydraulic interface, the other end of the extension oil cylinder hydraulic pipe is connected with the extension oil cylinder through the intermediate frame, one end of the hydraulic motor hydraulic pipe is connected with the central rotation hydraulic interface, and the other end of the hydraulic motor hydraulic pipe is sequentially connected with the hydraulic motor through the intermediate frame, the extension groove, the rear sliding rail and the track beam.

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