Dual-purpose excavator with interchangeable upper frame and crawler-type and tire-type lower frame

Abstract

The dual-purpose excavator comprises the upper frame and the lower frame, a mounting seat is arranged at the bottom of a rotary support, a quick connecting rod is fixedly mounted at the lower end of the mounting seat, a mounting rod is mounted on the top surface of a frame body, and the quick connecting rod and the mounting rod are connected in series through a bolt. The central oil separator is detachably mounted in the mounting seat, a first multi-path oil pipe joint is arranged outside the mounting seat, a second multi-path oil pipe joint is arranged in the frame body, and the first multi-path oil pipe joint and the second multi-path oil pipe joint form a multi-path hydraulic quick joint. Compared with the prior art, the upper frame has the advantages that the crawler excavator and the rubber-tyred excavator can share one upper frame, the engineering operation cost is reduced, auxiliary tools such as a crane are not needed during switching, and the switching operation is simple and easy.

Description

Technical Field

[0001] The present invention relates to an excavator, in particular to a dual-purpose excavator in which a crawler-type lower frame and a tire-type lower frame share an upper frame. Background Art

[0002] Existing excavators have two styles, one is crawler excavator, the other is tire excavator. Tire excavator uses the characteristics of tire tread to walk on regular roads without damaging the ground, and walks faster on regular road transfers. Crawler excavator uses crawlers as mobile devices to adapt to more complex construction site terrains, and is not easy to slip or fall in more complex construction sites. However, crawlers will leave traces of crawlers when moving during transfers, which will damage cement or asphalt paved roads. It is not suitable for walking on regular roads. In this way, engineering teams will configure wheel excavators and crawler excavators respectively when configuring excavators, so that the engineering team can select excavators according to actual road conditions and operations, which makes the use cost of the entire engineering team high. To this end, the inventor has also applied for a dual-purpose excavator with an upper frame and a crawler-type and tire-type lower frame interchangeable, the publication number of which is CN111776093A, which includes a lower frame for mounting the upper frame and a traveling mechanism installed on the lower frame for traveling; the traveling mechanism includes a crawler-type traveling mechanism, a front traveling mechanism and a rear steering traveling mechanism, the front traveling mechanism is disassembled and installed on the lower frame through the front lower frame, the front traveling mechanism includes a front tire wheel and a straight-moving driving device for driving the front tire wheel to move straight, and the rear traveling mechanism is disassembled and installed on the lower frame through the rear lower frame. The frame is detachably mounted on the lower frame, and the front lower frame and the rear lower frame are located outside the front and rear sides of the lower frame. The rear travel mechanism has a rear tire wheel and a steering travel drive device that drives the rear tire wheel to turn and travel. The crawler travel mechanism is provided with two, and the crawler travel mechanism has a crawler and a crawler installation drive mechanism for installing the crawler and driving the crawler to rotate. The crawler installation drive mechanism is detachable or fixedly connected to the lower frame; the crawler wheel frame and the tire wheel frame are disassembled and replaced with the lower frame to realize the dual-use interchange of the excavator. However, although this replacement solves the problem of the engineering team using one vehicle for two purposes, the wheel frame and the lower frame are heavy when disassembled because the drive device is set on the wheel frame, and the whole weight is heavy, and external tools and manpower are required to cooperate, and the disassembly and replacement are relatively laborious.

[0003] In view of this, the inventor conducted in-depth research on the above-mentioned issues, which resulted in the present case. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a dual-purpose excavator that can replace an upper frame easily and quickly and can be interchanged with a crawler-type lower frame and a tire-type lower frame.

[0005] In order to achieve the above-mentioned purpose, the solution of the present invention is: a dual-purpose excavator with an upper frame and a crawler-type and tire-type lower frame that can be replaced with each other, including an upper frame and a lower frame, the bottom of the upper frame has a base, a slewing support and a central oil distributor, the slewing support is installed below the base, the central oil distributor has an upper oil circuit interface and a lower oil circuit interface, the top surface of the lower frame is provided with an insertion through hole that is opposite to the slewing support, and the lower frame is provided with an oil circuit access port for oil circuit input; the above-mentioned lower frame has a crawler-type lower frame and a tire-type lower frame, and the above-mentioned crawler-type lower frame and the tire-type lower frame both have a frame body, and a mounting seat is provided at the bottom of the above-mentioned slewing support, and the mounting seat is a hollow column structure that penetrates from top to bottom, and the lower end of the above-mentioned mounting seat is fixedly installed with a quick-connect rod that is located outside the two sides of the mounting seat and is arranged horizontally, with the length of the quick-connect rod The degree direction is the front-to-back direction, the two quick-connect rods are arranged opposite to each other on the left and right sides, the top surface of the frame is located on both sides of the through hole, and mounting rods extending along the front-to-back direction are installed accordingly, the two quick-connect rods are between the two mounting rods, and the two quick-connect rods and the two mounting rods are connected in series through a latch, and a latch driving device for driving the latch to connect or separate the quick-connect rod and the mounting rod is installed on the mounting seat, the lower end of the above-mentioned central oil distributor is disassembled and installed in the mounting seat, the upper end of the above-mentioned central oil distributor, the slewing support and the base are connected together through a latch connection structure, a first multi-way oil pipe joint connected to the lower oil circuit interface is provided outside the above-mentioned mounting seat, a second multi-way oil pipe joint that can be pulled out of the frame and connected to the oil circuit access port is provided inside the above-mentioned frame, and the first multi-way oil pipe joint and the second multi-way oil pipe joint constitute a multi-way hydraulic quick joint.

[0006] The above-mentioned mounting seat is locked together with the slewing support and the base by screws, and a mounting plate is welded to the lower end surface of the mounting seat. The outer diameter of the mounting plate is larger than the outer diameter of the mounting seat. A through hole connected to the mounting seat is opened on the mounting plate, and the top surface of the mounting plate is located outside the mounting seat and the above-mentioned quick-connect rod is welded to it.

[0007] There is a spacing between the quick-connect rod and the mounting seat, and through holes penetrating left and right are respectively provided at the front and rear ends of the quick-connect rod, and mounting through holes are correspondingly provided at the two through holes of the mounting rod. The top surface of the mounting plate is located on the front and rear sides of the mounting seat, and double-output oil cylinders lying horizontally along the left and right directions are respectively installed. The two output ends of the double-output oil cylinders are respectively arranged in alignment with the through holes on the same side of the two quick-connect rods, and the two output ends of the double-output oil cylinders are fixed with the above-mentioned latch that can pass through the mounting through hole and the through hole, and the double-output oil cylinder is the latch driving device.

[0008] A lower plate body is welded on the inner side wall of the lower end of the mounting seat, and a lower convex ring is provided on the outer side wall of the lower end of the central oil distributor to match the lower plate body. The upper plate body and the lower convex ring are locked together by bolts and nuts.

[0009] The upper end of the above-mentioned central oil separator extends out of the slewing support, and the outer side wall of the upper end of the above-mentioned central oil separator is convexly provided with an upper convex ring located above the slewing support. The upper convex ring is located in the upper frame and above the base. The upper convex ring, the base and the slewing support are plugged together by a pin, and there is a distance between the upper convex ring and the base.

[0010] An accommodating seat is welded on the outer wall of the above-mentioned mounting seat, and the above-mentioned first joint of the multi-way oil pipe is placed inside the above-mentioned accommodating seat. The above-mentioned accommodating seat is provided with a pull-out outlet for pulling out the first joint of the multi-way oil pipe and a switch door for closing the pull-out outlet. The input end of the above-mentioned first joint of the multi-way oil pipe is connected and cooperated with the lower oil circuit interface through a hose, and a through hole for the hose to pass through is opened on the side wall of the mounting seat.

[0011] The top surface of the frame is provided with a projection opening for the second joint of the multi-channel oil pipe to be pulled out of the frame, and a switch door which can be opened upward is hingedly connected to the frame at the projection opening.

[0012] After adopting the above technical scheme, the dual-purpose excavator of the present invention, in which the upper frame and the crawler-type and tire-type lower frames are interchangeable, is used. When the tire-type lower frame and the crawler-type lower frame are placed side by side in a straight line, if the upper frame cooperates with the tire-type lower frame, the arm of the excavator on the upper frame is used to touch the ground to support the entire upper frame to slide. At this time, the upper frame will slide in translation with the thrust of the excavator arm. The sliding of the upper frame causes one end of the two quick-connecting rods of the upper frame to leave the tire-type lower frame and gradually translate to between the two mounting rods of the crawler-type lower frame. After the two quick-connecting rods of the upper frame are relatively positioned with the two mounting rods of the crawler-type lower frame, the latch driving device is started. , the upper frame is plugged into the crawler lower frame by a latch; finally, the mounting seat is plugged into the frame body through the latch connection structure to realize the installation of the upper frame and the crawler lower frame, the second joint of the multi-way oil pipe is pulled out, and the second joint of the multi-way oil pipe is plugged into the first joint of the multi-way oil pipe to realize the oil supply between the central oil distributor and the crawler lower frame, and the replacement of the crawler lower frame and the tire lower frame is completed. When replacing next time, it is only necessary to separate the second joint of the multi-way oil pipe from the first joint of the multi-way oil pipe. The latch connection structure releases the mounting seat and the frame body, and the latch is released from the mounting rod and the quick-connect rod, so that the arm of the excavator on the upper frame can push the upper frame to move horizontally to the tire lower frame. Compared with the prior art, the dual-purpose excavator of the present patent has an upper frame that can be interchanged with a crawler-type and a tire-type lower frame. The crawler-type excavator and the tire-type excavator can share one upper frame, which greatly reduces the engineering operation cost. Moreover, when switching between the two lower frames, there is no need for auxiliary tools such as a crane. The switching can be achieved directly by using the thrust of the excavator arm. The switching operation is simple, and after switching, only plugging is required. The structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the combination of the upper frame and the frame body;

[0014] Figure 2 A schematic diagram of the combination of an upper frame and a tire-type frame;

[0015] Figure 3 It is a schematic diagram of the combination of the upper frame and the crawler frame;

[0016] Figure 4 It is a partial schematic diagram of the upper frame;

[0017] Figure 5 This is an exploded diagram of the center oil distributor and the lower frame. DETAILED DESCRIPTION

[0018] The present invention provides a dual-purpose excavator in which an upper frame and a crawler-type and tire-type lower frame are interchangeable. Figure 1-5 As shown, it includes an upper frame and a lower frame, the bottom of the upper frame has a base 11, a slewing support 12 and a central oil distributor 2, the central oil distributor 2 has an upper oil circuit interface and a lower oil circuit interface, the central area of ​​the base and the slewing support are provided with a central hole for the central oil distributor 2 to pass through and install, the top surface of the lower frame is provided with an insertion hole corresponding to the slewing support, and the lower frame is provided with an oil circuit access port for oil circuit input. In the present invention, the central oil distributor, the upper frame and the lower frame are all existing technologies and will not be repeated here.

[0019] The innovation of the present invention lies in that the lower frame has a crawler lower frame and a tire lower frame, both of which are existing frames and are well-known products. Both the crawler lower frame and the tire lower frame have a frame body 100, and a circular through hole 101 is provided at the central area of ​​the frame body. This circular through hole 101 is the insertion through hole, and the frame body 100 is provided with the oil circuit access port, which is the hydraulic oil input port used for the lower frame. This oil circuit access port is connected to the central oil distributor, which is a well-known technology, and the working principle will not be repeated here. The frame of this patent is a frame of the existing structure, and the only difference is that the insertion through hole of the crawler lower frame is to be opened in the central area.

[0020] The bottom of the slewing support 12 is provided with a mounting seat 3, which is a hollow cylindrical structure that runs through the top and bottom, preferably a cylindrical structure, which is locked together with the slewing support 12 and the base 11 by screws, and the screws are installed upward from bottom to top, and the lower end of the mounting seat 3 is fixedly installed with a quick-connect rod 4 that is located outside the two sides of the mounting seat 3 and is horizontally arranged, with the length direction of the quick-connect rod 4 as the front-to-back direction, and the length direction of the quick-connect rod 4 is the same as the front-to-back direction of the car, and the two quick-connect rods 4 are arranged opposite to each other on the left and right sides, and the top surface of the frame 100 is located outside the left and right sides extending into the through hole, and mounting rods 5 extending along the front-to-back direction are correspondingly installed, and the mounting rods and quick-connect rods are preferably square tubes, and the two quick-connect rods 4 are between the two mounting rods 5, and the two quick-connect rods 4 are connected in series with the two mounting rods 5 through a latch 6, and a latch driving device for driving the latch to connect or separate the quick-connect rod and the mounting rod is installed on the mounting seat 3.

[0021] Preferably, a mounting plate 31 is welded to the lower end face of the mounting seat 3, the outer diameter of the mounting plate 31 is larger than the outer diameter of the mounting seat 3, a through hole (not shown) communicating with the mounting seat 3 is provided on the mounting plate 31, the top surface of the mounting plate 31 is located outside the mounting seat and the quick-connect rod 4 is welded thereon, preferably the length of the quick-connect rod is longer than the length of the mounting plate, that is, the front and rear ends of the quick-connect rod are both outside the front and rear ends of the mounting plate. In the present invention, a closed annular convex ring can also be welded directly on the outer side wall of the mounting seat 3, the bottom surface of the closed annular convex ring is flush with the bottom surface of the mounting seat, the closed annular convex ring is in a square structure, and the quick-connect rod is welded to the closed annular convex ring.

[0022] There is a spacing between the quick-connect rod 4 and the mounting seat 3. The front and rear ends of the quick-connect rod 4 are respectively provided with through holes (not shown in the figure) that penetrate along the left and right directions. The mounting rod 5 is correspondingly provided with mounting through holes at the two through holes. The top surface of the mounting plate 31 is located on the front and rear sides of the mounting seat 3, and double-output oil cylinders 7 lying along the left and right directions are respectively installed. The two output ends of the double-output oil cylinder 7 are respectively arranged in alignment with the through holes on the same side of the two quick-connect rods, that is, the double output ends of the double-output oil cylinder 7 on the left side are aligned with the through holes and the mounting through holes on the left side, and the double output ends of the double-output oil cylinder on the right side are aligned with the through holes and the mounting through holes on the right side, and the two output ends of the double-output oil cylinder 7 are fixed with the latch 6 that can pass through the mounting through holes and the through holes. This double-output oil cylinder is the latch driving device. In the present invention, in order to facilitate the installation of the dual-output oil cylinder and the installation stability of the quick-connect rod and the mounting rod, welding plates 311 extending outward and gradually shrinking outward are welded on both sides of the mounting plate 31, and the cylinder body of the dual-output oil cylinder 7 is horizontally fixedly installed on the welding plate. In this way, the dual-output oil cylinder can be installed away from the mounting plate by using the welding plate, so that the quick-connect rod and the mounting rod are inserted outside the mounting plate, making the installation of the quick-connect rod more stable.

[0023] The central oil separator 2 is in the mounting seat 3, and the lower end of the central oil separator 2 is disassembled and installed in the mounting seat 3, and the upper end of the central oil separator 2, the slewing support 12 and the base 11 are connected together by a latch connection structure; specifically, a lower sheet 32 ​​is welded on the inner side wall of the lower end of the mounting seat 3, and a mounting hole penetrating from top to bottom is opened on the lower sheet 32, and a lower convex ring 21 is provided on the outer side wall of the lower end of the central oil separator 2, which is overlapped and matched with the lower sheet 32, and the lower convex ring 21 is overlapped on the lower sheet 32, and the lower sheet 32 ​​and the lower convex ring 21 are locked together by the cooperation of bolts and nuts, that is, a mounting hole is also opened on the lower convex ring 21, and the bolt passes through the lower convex ring 21. The mounting hole of the convex ring and the mounting hole of the upper plate are then locked together by nuts; the upper end of the central oil separator 2 extends upward from the slewing support 12 and the base 11 to the upper frame, and the outer wall of the upper end of the central oil separator 2 is convexly provided with an upper convex ring 22 located above the slewing support, and there is a spacing between the upper convex ring 22 and the base, and the upper convex ring 22 is provided with bolt holes 221 that pass through the upper and lower parts, and the base 11 is located outside the center hole and has a through hole corresponding to the bolt hole, and the top surface of the slewing support is concave with a receiving groove corresponding to the through hole, and this receiving groove can also be a through hole, and the upper convex ring 22, the base 11 and the slewing support 12 are plugged together by a latch 200. In the present invention, the central oil distributor is installed in the mounting seat, so that the central oil distributor will not affect the upper frame when the upper frame is translated, avoiding the problem that the upper part of the traditional central oil distributor is inside the upper frame and the lower part extends outside the upper frame so that the upper frame cannot be translated on the lower frame. When the upper frame is translated to a good position, the lower frame is aligned.

[0024] The mounting seat 3 is provided with a first multi-way oil pipe joint (not shown in the figure) connected to the lower oil circuit interface, and the frame body 100 is provided with a second multi-way oil pipe joint (not shown in the figure) which can be pulled out of the frame body and connected to the oil circuit access port. The first multi-way oil pipe joint and the second multi-way oil pipe joint constitute a multi-way hydraulic quick joint. This multi-way hydraulic quick joint is a well-known product, and its first multi-way oil pipe joint is equivalent to the male joint or female joint of the multi-way hydraulic quick joint. Correspondingly, the second multi-way oil pipe joint is the female joint or male joint of the multi-way hydraulic quick joint. Direct plugging of the two joints can realize the independent connection and coordination of multi-way hydraulic oil.

[0025] In this patent, in order to prevent the multi-way hydraulic quick connector from being affected when the upper frame and the lower frame are switched, a built-in accommodating seat 33 is welded on the outer wall of the mounting seat 3. The accommodating seat 33 contains the first multi-way oil pipe connector. The side wall of the accommodating seat 33 is provided with a pull-out port (not shown in the figure) for pulling out the first multi-way oil pipe connector. The accommodating seat 33 is hinged at the pull-out port with a switch door (not shown in the figure) that can open and close the pull-out port. The structure of the switch door is an existing technology and will not be repeated here. The input end of the first multi-way oil pipe connector is connected and matched with the lower oil circuit interface through a hose (not shown in the figure). The side wall of the mounting seat 3 is provided with a through hole (not shown in the figure) for the hose to pass through. The accommodating seat 33 is used to hide the first multi-way oil pipe connector when switching, which will not affect the switching of the upper frame and the lower frame, and will not be contaminated by dust. Correspondingly, the frame 100 is provided with an extension opening outside the insertion through hole for the second joint of the multi-way oil pipe to be pulled out of the frame, and the frame 100 is hinged with a switch door 102 that can be opened upward at the extension opening. This switch door 102 is also a well-known technology. In order to facilitate the opening of the two switch doors, a handle can be made on the switch door, and the handle of the switch door on the frame 100 cannot be higher than the top surface of the frame 100.

[0026] After adopting the above technical scheme, the dual-purpose excavator of the present invention, in which the upper frame and the crawler-type and tire-type lower frames are interchangeable, when in use, if the upper frame is initially installed on the tire-type lower frame, the crawler-type lower frame is transferred to the tire-type lower frame and is placed in a straight line with the tire-type lower frame at a distance from the front and rear. After that, the arm of the excavator on the upper frame is extended to the ground, and the arm of the excavator is extended again. At this time, because the arm of the excavator cannot move, the interaction of forces is utilized to make the upper frame pushed and translated by the arm of the excavator. The translation of the upper frame makes one end of the two quick-connect rods on the upper frame first extend to the top surface of the crawler-type lower frame and be located between the two mounting rods. In the meantime, the thrust of the excavator arm is used to make the upper frame move horizontally all the time so that the through holes of the two quick-connect rods on the upper frame and the installation through holes are aligned. After that, the double output oil cylinder 7 is started, and the two output ends of the double output oil cylinder 7 extend in opposite directions, and the latch 6 is correspondingly translated toward the quick-connect rod direction, so that the latch 6 is plugged into the quick-connect rod and the installation rod to achieve the installation of the upper frame and the lower frame; finally, the two opening doors are opened, and the first joint of the multi-way oil pipe and the second joint of the multi-way oil pipe are pulled out respectively, and the first joint of the multi-way oil pipe is plugged into the second joint of the multi-way oil pipe to achieve the oil supply of the central oil distributor and the crawler lower frame, and finally the replacement of the crawler lower frame and the tire lower frame is completed. When replacing next time, just separate the first joint of the multi-way oil pipe from the second joint of the multi-way oil pipe and hide them, and the double output oil cylinder 7 removes the two latches from the quick-connect rod and the installation rod, so that the upper frame and the lower frame can be separated and switched freely. Compared with the prior art, the present invention provides a dual-purpose excavator with an upper frame interchangeable with a crawler-type and a tire-type lower frame. The crawler-type excavator and the tire-type excavator can share one upper frame, greatly reducing the engineering operation cost. No auxiliary tools such as cranes are required for switching. The switching can be achieved directly by using the thrust of the excavator arm. The switching operation is simple and only needs to be plugged in after switching. The disassembly and assembly operation is convenient and the overall structure is simple.

[0027] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made thereto by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A dual-purpose excavator with an upper frame and a crawler-type or tire-type lower frame interchangeably detachable, comprising an upper frame and a lower frame, wherein the bottom of the upper frame has a base, a slewing support and a central oil distributor, the slewing support is installed below the base, the central oil distributor has an upper oil circuit interface and a lower oil circuit interface, the top surface of the lower frame is provided with an insertion through hole corresponding to the slewing support, and an oil circuit access port for oil circuit input is provided in the lower frame; characterized in that: The above-mentioned lower frame includes a crawler-type lower frame and a tire-type lower frame. Both the crawler-type lower frame and the tire-type lower frame have a frame body. A mounting seat is provided at the bottom of the above-mentioned slewing support. The mounting seat is a hollow column structure penetrating from top to bottom. A quick-connect rod located outside both sides of the mounting seat and arranged horizontally is fixedly installed at the lower end of the above-mentioned mounting seat. The length direction of the quick-connect rod is the front-to-back direction. The two quick-connect rods are arranged opposite to each other on the left and right. The top surface of the frame body is located outside both sides extending into the through hole. Mounting rods extending in the front-to-back direction are correspondingly installed. The two quick-connect rods are located between the two mounting rods, and the two quick-connect rods are connected to the two mounting rods. They are connected in series through a latch, and a latch driving device for connecting or separating a driving latch with a quick-connect rod and a mounting rod is installed on the mounting seat. The lower end of the above-mentioned central oil distributor is disassembled and installed in the mounting seat, and the upper end of the above-mentioned central oil distributor, the slewing support and the base are connected together through a latch connection structure. The outside of the above-mentioned mounting seat is provided with a first multi-way oil pipe joint connected to the lower oil circuit interface, and the body of the above-mentioned frame is provided with a second multi-way oil pipe joint that can be pulled out of the frame and connected to the oil circuit access port. The above-mentioned first multi-way oil pipe joint and the second multi-way oil pipe joint constitute a multi-way hydraulic quick joint.

2. A dual-purpose excavator with an upper frame interchangeable with a crawler-type and tire-type lower frame according to claim 1, characterized in that: The above-mentioned mounting seat is locked together with the slewing support and the base by screws, and a mounting plate is welded to the lower end surface of the mounting seat. The outer diameter of the mounting plate is larger than the outer diameter of the mounting seat. A through hole connected to the mounting seat is opened on the mounting plate, and the top surface of the mounting plate is located outside the mounting seat and the above-mentioned quick-connect rod is welded to it.

3. A dual-purpose excavator with an upper frame interchangeable with a crawler-type and tire-type lower frame according to claim 2, characterized in that: There is a spacing between the quick-connect rod and the mounting seat, and through holes penetrating left and right are respectively provided at the front and rear ends of the quick-connect rod, and mounting through holes are correspondingly provided at the two through holes of the mounting rod. The top surface of the mounting plate is located on the front and rear sides of the mounting seat, and double-output oil cylinders lying horizontally along the left and right directions are respectively installed. The two output ends of the double-output oil cylinders are respectively arranged in alignment with the through holes on the same side of the two quick-connect rods, and the two output ends of the double-output oil cylinders are fixed with the above-mentioned latch that can pass through the mounting through hole and the through hole, and the double-output oil cylinder is the latch driving device.

4. A dual-purpose excavator with an upper frame interchangeable with a crawler-type and tire-type lower frame according to claim 2, characterized in that: A lower plate body is welded on the inner side wall of the lower end of the mounting seat, and a lower convex ring is provided on the outer side wall of the lower end of the central oil distributor to match the lower plate body. The upper plate body and the lower convex ring are locked together by bolts and nuts.

5. A dual-purpose excavator with an upper frame interchangeable with a crawler-type and tire-type lower frame according to claim 2, characterized in that: The upper end of the above-mentioned central oil separator extends out of the slewing support, and the outer side wall of the upper end of the above-mentioned central oil separator is convexly provided with an upper convex ring located above the slewing support. The upper convex ring is located in the upper frame and above the base. The upper convex ring, the base and the slewing support are plugged together by a pin, and there is a distance between the upper convex ring and the base.

6. A dual-purpose excavator with an upper frame interchangeable with a crawler-type or tire-type lower frame according to claim 2 or 4, characterized in that: An accommodating seat is welded on the outer wall of the above-mentioned mounting seat, and the above-mentioned first joint of the multi-way oil pipe is placed inside the above-mentioned accommodating seat. The above-mentioned accommodating seat is provided with a pull-out outlet for pulling out the first joint of the multi-way oil pipe and a switch door for closing the pull-out outlet. The input end of the above-mentioned first joint of the multi-way oil pipe is connected and cooperated with the lower oil circuit interface through a hose, and a through hole for the hose to pass through is opened on the side wall of the mounting seat.

7. A dual-purpose excavator with an upper frame interchangeable with a crawler-type or tire-type lower frame according to claim 2 or 4, characterized in that: The top surface of the frame is provided with a projection opening for the second joint of the multi-channel oil pipe to be pulled out of the frame, and a switch door which can be opened upward is hingedly connected to the frame at the projection opening.

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