Excavator with adjustable gravity center

Abstract

The invention discloses an excavator with the adjustable gravity center. The excavator comprises a lower vehicle X frame, a water storage bag made of flexible materials and a combined balance weight. The getting-off X frame comprises four supporting legs which are of hollow structures; the water storage bags made of flexible materials are arranged in the cavities of the supporting legs respectively, at least one water valve switch is arranged on each water storage bag, openings are formed in the positions, opposite to the water valve switches, of the supporting legs, and water is injected and drained into the water storage bags through the at least one water valve switch, so that the weight of a vehicle is increased or reduced. The combined counterweight comprises a lower box body, an upper box body and an execution part, the lower box body is fixed on the rotary table, the upper box body is slidably connected to the lower box body, and the execution part is operated to drive the upper box body to perform front-back position adjustment relative to the lower box body in the driving direction of the excavator, so that the gravity center position of the whole machine is adjusted. The device is simple in structure, small in change of an existing structure, convenient to adjust and operate and capable of meeting most working condition requirements.

Description

Technical Field

[0001] The invention relates to an excavator with adjustable center of gravity, belonging to the technical field of excavators. Background Art

[0002] The working conditions of hydraulic excavators are very diverse. Excavation, leveling, hoisting, crushing, etc. have different effects on the stability of the whole machine. Even in the excavation condition, the bucket capacity, the density of the excavated material, and the distance of the operation will affect the stability of the whole machine to varying degrees. The weight and position of the counterweight of a hydraulic excavator are generally fixed and cannot be adjusted, so the center of gravity of the excavator is generally fixed in the same posture. For heavy load conditions such as excavation and hoisting of large-capacity buckets or high-density materials, the center of gravity of the whole machine needs to be as far back as possible to improve the stability of the operation. For leveling and transportation conditions, the center of gravity should be as close to the center of rotation as possible to reduce the moment of inertia. A fixed center of gravity position cannot meet the above different operating requirements.

[0003] There are two common methods to adjust the center of gravity: ① Design two to three counterweights of different qualities, and customers can choose one according to their own working conditions.

[0004] ② In addition to the standard weight counterweight (usually at the top or rear), a second counterweight (hereinafter referred to as secondary counterweight) is designed, and the two counterweights are connected together by bolts or other mechanisms.

[0005] However, the above two methods of adjusting the center of gravity both have the following shortcomings: In the first method, due to the large overall weight of the counterweight, inconvenience in carrying, and high price, customers generally only choose one. Customers need to plan the main purpose of the product in advance and choose according to the main purpose. However, due to the complex working conditions of the excavator and frequent changes in posture during operation, most customers generally do not have the corresponding professional knowledge and use the factory default standard quality counterweight. Even if the working conditions change greatly during later use, it is unlikely that another counterweight will be purchased, and it cannot be replaced.

[0006] The second method is more convenient, but is limited by the space at the rear of the excavator and the reliability of the structure. The secondary counterweight is relatively small in size and its mass is generally about 7% of the original counterweight. However, its installation requires the aid of additional lifting equipment and will affect the rear field of view or the tail turning radius of the entire machine in the long term.

[0007] Therefore, the above two solutions will increase the transportation weight of the whole machine and increase the transportation cost. Summary of the invention

[0008] In view of the deficiencies in the prior art, the present invention provides an excavator with an adjustable center of gravity, which has a simple structure, requires little change to the existing structure, has strong versatility, is low cost, is easy to adjust and operate, can meet the requirements of most working conditions, does not require additional lifting equipment for installation and adjustment, does not affect the operating weight of the entire machine, does not increase transportation costs, and is convenient for cleaning the vehicle, achieving multiple goals at one stroke.

[0009] The present invention is implemented according to the following technical solutions: An excavator with adjustable center of gravity, comprising: The lower X-frame includes a slewing device at the center, four legs extending outward from the slewing device, and two longitudinal beams arranged in parallel and symmetrically and respectively connected to the two legs; the four legs are all hollow structures; A water storage bag made of a flexible material is arranged in the cavity of each leg, and at least one water valve switch is provided on the water storage bag. The leg is provided with an opening at a position relative to the water valve switch. The water storage bag is filled with water or drained by the at least one water valve switch to increase or reduce the weight of the vehicle when getting off the vehicle. The combined counterweight includes a lower box body, an upper box body and an actuator. The lower box body is fixed on a turntable, and the upper box body is slidably connected to the lower box body. By operating the actuator, the upper box body is driven to adjust its front and rear position relative to the lower box body in the direction of travel of the excavator, thereby adjusting the center of gravity position of the entire machine.

[0010] In some embodiments, two openings are respectively provided on the front facades of the two legs along the forward direction of the excavator and the rear inner surfaces of the two legs along the backward direction of the excavator, and the water storage bag is respectively provided with a water valve switch at the two opposite openings; one of the water valve switches is used as a water injection valve, and the other water valve switch is used as a drainage valve.

[0011] In some embodiments, one opening on the support leg is arranged at a position close to the rotating device, and the other opening on the support leg is arranged at a position close to the longitudinal beam; the opening position close to the rotating device is higher than the opening position close to the longitudinal beam, the water injection valve is arranged at the opening close to the rotating device, and the drainage valve is arranged at the opening close to the longitudinal beam.

[0012] In some embodiments, a sealing cover plate is installed at the opening on the supporting leg, and the sealing cover plate can completely cover the opening. The water valve switch is operated by opening the sealing cover plate, and the supporting leg is sealed by closing the sealing cover plate.

[0013] In some embodiments, the sealing cover plate is fixed to the support leg at the opening by means of circumferential bolts; or, one end of the sealing cover plate is hinged to the support leg at the opening by a hinge, and the other end is fixed by a plurality of bolts.

[0014] In some embodiments, a plurality of sliding bearing surfaces arranged in parallel and opposite to each other at intervals are provided on the bottom plane of the upper box body and the top plane of the lower box body for reducing the sliding friction between the upper and lower boxes.

[0015] In some embodiments, a guide fixing component is provided between the lower box body and the upper box body, which enables the upper box body to move forward and backward along the travel direction of the excavator and fix the upper box body on the lower box body after movement.

[0016] In some embodiments, the top surface of the lower box body is provided with a plurality of threaded holes arranged at intervals along its length direction; the upper box body is provided with a plurality of slide grooves arranged at intervals along its length direction and passing through the upper and lower surfaces, and one slide groove corresponds to one threaded hole; each group of slide grooves and threaded holes cooperates with a long bolt to constitute the guide and fixing component, the long bolt passes through the slide groove and is screwed into the threaded hole, the slide groove cooperates with the loosened long bolt to realize a linear guide function, and the tightened long bolt fixes the upper box body to the lower box body.

[0017] In some embodiments, the guide and fixing component also includes a gasket, which is located on the top surface of the upper box body and is coaxially arranged with the threaded hole. The long bolt first passes through the gasket, then passes through the slide groove and is screwed into the threaded hole.

[0018] In some embodiments, the execution component includes: A pull ring, fixed in the middle area of ​​the upper box body and close to the front edge; A steering assembly is mounted on a guide fixing component located in the middle area of ​​the upper box body; Pull rope, when the upper box body needs to move forward relative to the lower box body, one end of the pull rope is connected to the movable arm, and the other end of the pull rope is connected to the pull ring, and the upper box body is pulled forward by the movement of the movable arm; when the upper box body needs to move backward relative to the lower box body, one end of the pull rope is connected to the movable arm, and the other end of the pull rope is first connected to the steering assembly and then to the pull ring, and the upper box body is pulled backward by the movement of the movable arm.

[0019] In some embodiments, the steering assembly comprises: The pulley bracket is composed of a bottom plate and two side plates oppositely fixed to the top surface of the bottom plate and extending vertically upward therefrom, wherein the bottom plate is provided with a mounting hole for fixing on the guide fixing component, and the two side plates are each provided with a coaxially arranged reaming hole; The pulley is provided with a circumferentially extending annular groove. The pulley is rotatably supported between the two side plates through the cooperation of a pin shaft and a reaming hole. The pull rope is connected to the pull ring after passing around the pulley, thereby changing the pulling direction of the pull rope.

[0020] It should be noted that the present invention does not use a hydraulic cylinder for reversing adjustment because the hydraulic cylinder is only a displacement adjustment mechanism and cannot withstand the huge inertial impact and yaw torque of the upper box. Long bolts are still required to press the upper and lower boxes, and the adjustment time is not advantageous. In addition, the hydraulic cylinder also needs to be added with a reversing control valve, a hose, etc., which is costly, occupies a large installation space, and has various time-limited risks such as oil leakage.

[0021] Beneficial effects of the present invention: 1. Make full use of the internal cavity of the X-frame of the undercarriage, and build in a flexible water storage bag to fully utilize the fluidity, easy availability and low cost of water. By injecting and discharging water into the water storage bag, the mass of the undercarriage assembly is adjusted, and the center of gravity of the undercarriage is changed to improve the stability of the whole machine.

[0022] 2. The integral counterweight is designed into two parts, the lower box is fixed and cannot be adjusted, and the upper box can move forward and backward relative to the lower box. The upper box position can be changed by pulling the wire rope through the movement of the boom, thereby changing the center of gravity of the counterweight and improving the stability of the whole machine. Because there is no need for too many control components and the structure is simple, it has low cost, easy operation and good reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0024] In the attached picture: Figure 1 It is a schematic diagram of the prior art X-frame structure for getting off the vehicle (the upper cover of the X-frame is hidden); Figure 2 It is a structural schematic diagram of the present invention's lower vehicle X-frame equipped with a water storage bag; Figure 3 It is a structural schematic diagram of the combined counterweight of the present invention; Figure 4 It is a structural schematic diagram of the lower box body of the present invention; Figure 5 It is a structural schematic diagram of the upper box body of the present invention; Figure 6 Schematic diagram of the structure of the pulley and pulley bracket of the present invention (a is the pulley, b is the pulley bracket).

[0025] Figures and symbols: 1-1, water storage bag, 1-2, upper water inlet cover plate, 1-3, lower water outlet cover plate; 2-1, lower box body, 2-2, upper box body, 2-3, guide fixing component, 2-4, pull rope, 2-5, pulley, 2-6, pulley bracket, 2-7, threaded hole, 2-8, sliding bearing surface, 2-9, slide groove, 2-10, pull ring, 2-11, long bolt, 2-12, gasket; 3-1, lower X-frame, 3-2, longitudinal beam, 3-3, outrigger, 3-4, travel motor mounting seat, 3-5, guide seat, 3-6, slewing device.

[0026] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0028] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] like Figure 1 , Figure 2 , Figure 3As shown, in order to improve the stability of the whole machine, the center of gravity of the whole machine must be adjusted. Except for the center of gravity of the working device of the hydraulic excavator which can change with the posture, the center of gravity of the other parts is basically fixed. The present invention is to achieve the adjustable mass or center of gravity of the remaining parts, so it provides an excavator with an adjustable center of gravity, including an undercarriage X-frame 3-1, a water storage bag 1-1 made of flexible material and a combined counterweight; the undercarriage X-frame 3-1 includes a slewing device 3-6 located at the center, four legs 3-3 extending outward from the slewing device 3-6 and two longitudinal beams 3-2 arranged in parallel and symmetrically and respectively connected to the two legs 3-3; the four legs 3-3 are all hollow structures; the water storage bag 1-1 made of flexible material is respectively arranged in the cavity of each leg 3-3, and the water storage bag 1-1 is made of flexible material. At least one water valve switch is provided on the water bag 1-1, and the support leg 3-3 is provided with an opening at a position relative to the water valve switch. The water bag 1-1 is filled with water and drained through at least one water valve switch to increase or reduce the weight of the vehicle; the combined counterweight includes a lower box body 2-1, an upper box body 2-2 and an actuator. The lower box body 2-1 is fixed on a turntable, and the upper box body 2-2 is slidably connected to the lower box body 2-1. By operating the actuator, the upper box body 2-2 is driven to adjust its front and rear position relative to the lower box body 2-1 in the direction of travel of the excavator, thereby adjusting the center of gravity of the entire machine.

[0031] It should be noted that if Figure 1 As shown, the lower X-frame 3-1 of the excavator has four outwardly extending legs 3-3, two of which are located at the travel motor mounting seat 3-4 and have hydraulic hoses passing through their inner cavities, but the hoses occupy very little space; the other two legs located at the guide seat 3-5 are completely empty.

[0032] Further solutions, such as Figure 2 As shown, two openings are respectively provided on the front facades of the two legs 3-3 along the forward direction of the excavator and the rear inner surfaces of the two legs 3-3 along the backward direction of the excavator, and the water storage bag is respectively provided with a water valve switch at the two opposite openings; one of the water valve switches is used as a water filling valve, and the other water valve switch is used as a drainage valve.

[0033] Further solutions, such as Figure 2 As shown, one opening on the leg 3-3 is arranged at a position close to the rotating device 3-6, and the other opening on the leg 3-3 is arranged at a position close to the longitudinal beam 3-2; the opening position close to the rotating device 3-6 is higher than the opening position close to the longitudinal beam 3-2, the water injection valve is arranged at the opening close to the rotating device 3-6, and the drainage valve is arranged at the opening close to the longitudinal beam 3-2.

[0034] Further solutions, such as Figure 2As shown, in order to prevent foreign matter from damaging the water storage bag and invading the cavity, a sealing cover is installed at the opening of the leg 3-3, and the sealing cover can completely cover the opening. The water valve switch is operated by opening the sealing cover, and the leg is sealed by closing the sealing cover. Specifically: when water needs to be injected, open the upper water injection port cover 1-2, and press the upper water injection port cover 1-2 after the water injection is completed. When drainage is required, open the lower drainage port cover 1-3, and press the lower drainage port cover 1-3 after drainage is completed.

[0035] Preferably, the upper water inlet cover plate 1-2 and the lower water outlet cover plate 1-3 can be fixed to the support legs 3-3 at the opening by means of circumferential bolts, or one end can be hinged to the support legs 3-3 at the opening by a hinge and the other end can be fixed by bolts.

[0036] It should be noted that, according to the calculation conditions of excavator stability, no matter working in the front or side, the X-frame is always on the stable moment side of the overturning fulcrum, so the water bag always generates a stable moment. When the stability of the whole machine needs to be improved, fill the water bag with water to increase the total mass of the vehicle. When it is necessary to transfer, climb, etc., empty the water bag to reduce the total mass of the vehicle. Although the density of water is less than that of cast iron and filling mixture, and the length of the stable moment arm is also less than the length of the counterweight position arm, this method is easy to obtain materials, easy to operate, high filling and discharging efficiency, low cost, and does not change the main structural strength and external dimensions of the chassis. It is easy to operate, and the discharged water can also be used to clean the vehicle, killing two birds with one stone.

[0037] Further solutions, such as Figure 3 , Figure 4 , Figure 5 As shown, a plurality of sliding bearing surfaces 2-8 arranged in parallel and opposite to each other for reducing the sliding friction between the upper and lower boxes are provided on the bottom plane of the upper box body 2-2 and the top plane of the lower box body 2-1.

[0038] In a preferred solution, three strip-shaped sliding bearing surfaces 2-8 are provided on the bottom plane of the upper box 2-2 and the top plane of the lower box 2-1. The bottom plane of the upper box 2-2 and the top plane of the lower box 2-1 are polished into three strip-shaped smooth surfaces to form the sliding bearing surfaces 2-8; or three strip-shaped smooth plates are fixed on the bottom plane of the upper box 2-2 and the top plane of the lower box 2-1 to form the sliding bearing surfaces 2-8.

[0039] Further solutions, such as Figure 3 , Figure 4 , Figure 5 As shown, a guide fixing component 2-3 is provided between the lower box body 2-1 and the upper box body 2-2, which enables the upper box body 2-2 to move forward and backward along the driving direction of the excavator and fix the upper box body 2-2 on the lower box body 2-1 after movement.

[0040] Further solutions, such as Figure 3 , Figure 4 , Figure 5 As shown, a plurality of threaded holes 2-7 are arranged at intervals along the length direction thereof on the top surface of the lower box body 2-1; a plurality of slide grooves 2-9 are arranged at intervals along the length direction thereof and pass through the upper and lower surfaces thereof on the upper box body 2-2, and one slide groove 2-9 corresponds to one threaded hole 2-7; each group of slide grooves 2-9 and threaded holes 2-7 cooperate with a long bolt 2-11 to form a guide fixing component 2-3, the long bolt 2-11 passes through the slide groove 2-9 and is screwed into the threaded hole 2-7, the slide groove 2-9 cooperates with the loosened long bolt 2-11 to realize a linear guide function, and the tightened long bolt 2-11 fixes the upper box body 2-2 to the lower box body 2-1.

[0041] Further solutions, such as Figure 3 As shown, the guide fixing component 2-3 also includes a gasket 2-12, which is located on the top surface of the upper box body 2-2, and the gasket 2-12 is arranged coaxially with the threaded hole 2-7. The long bolt 2-11 first passes through the gasket 2-12, then passes through the slide groove 2-9 and is screwed into the threaded hole 2-7.

[0042] Further solutions, such as Figure 3 As shown, the actuator includes a pull ring 2-10, a steering assembly and a pull rope 2-4 (preferably a steel wire rope); the pull ring 2-10 is fixed in the middle area of ​​the upper box body 2-2 and close to the front end edge; the steering assembly is installed on the guide fixing component 2-3 located in the middle area of ​​the upper box body 2-2; when the upper box body 2-2 needs to move forward relative to the lower box body 2-1, one end of the pull rope 2-4 is connected to the boom, and the other end of the pull rope 2-4 is connected to the pull ring 2-10, and the upper box body 2-2 is pulled forward by the movement of the boom; when the upper box body 2-2 needs to move backward relative to the lower box body 2-1, one end of the pull rope 2-4 is connected to the boom, and the other end of the pull rope 2-4 is first connected to the steering assembly and then to the pull ring 2-10, and the upper box body 2-2 is pulled backward by the movement of the boom.

[0043] Further solutions, such as Figure 6 As shown, the steering assembly includes a pulley bracket 2-6 and a pulley 2-5; the pulley bracket 2-6 is composed of a base plate and two side plates that are oppositely fixed on the top surface of the base plate and extend vertically upward therefrom, the base plate is provided with a mounting hole for fixing on a long bolt 2-11, and each of the two side plates is provided with a coaxially arranged reaming hole; the pulley 2-5 is provided with a circumferentially extending annular groove, the pulley 2-5 is rotatably supported between the two side plates through the cooperation of a pin shaft and the reaming hole, the pull rope 2-4 is connected to the pull ring 2-10 after passing around the pulley 2-5, thereby changing the pulling direction of the pull rope 2-4.

[0044] In a preferred embodiment, three threaded holes 2-7 are provided on the top surface of the lower box body 2-1, and three slide grooves 2-9 are provided on the upper box body 2-2. The upper box body 2-2 is guided and fixed on the lower box body 2-1 by three long bolts 2-11; the steering assembly is installed on the middle long bolt 2-11.

[0045] As can be seen from the above, the above scheme is to design the integral fixed center of gravity counterweight into a combined counterweight with adjustable center of gravity. The lower box 2-1 is connected to the turntable, and its position is always fixed. The front and rear positions of the upper box 2-2 relative to the lower box 2-1 can be adjusted. The center of gravity position of the counterweight is adjusted by adjusting the front and rear positions of the upper box 2-2, thereby adjusting the center of gravity position of the whole machine. When the load is light, the upper box 2-2 is adjusted to the front end, the stabilizing arm of the counterweight is the shortest, the torque generated is the smallest, and the operation stability is not affected. In addition, the tail turning radius of the whole machine is the smallest, which is suitable for operation in a small space. When the load is heavy, the upper box 2-2 is adjusted to the last limit position, the center of gravity moves backward, causing the overall center of gravity position of the counterweight to move backward, and the stabilizing arm generated by the counterweight is the longest, which increases the operation stability. However, the tail turning radius increases at this time, which is suitable for operation in a wider area.

[0046] In summary, the present invention provides an excavator with adjustable center of gravity, which mainly includes two aspects: 1. Make full use of the cavity of the X-frame of the vehicle. Add two openings on the easily accessible surface in the front and rear directions of each leg, and then place a flexible water bag 1-1 in the cavity, a total of four can be placed. Each water bag is equipped with a water valve switch at the two opening positions. The opening position near the center of rotation is higher and has a water injection valve; the opening position near the longitudinal beam is lower and has a drainage valve. In order to prevent foreign objects from damaging the water bag and invading the cavity, sealing covers 1-2 and 1-3 are added at the opening. When water injection is required, open the upper cover 1-2, and press the cover 1-2 after the water injection is completed. When drainage is required, open the lower cover 1-3, and press the cover 1-3 after drainage.

[0047] Second, the integral fixed center of gravity counterweight is designed as a combined counterweight with adjustable center of gravity. The upper top surface of the lower box 2-1 is provided with a plurality of threaded holes 2-7 and a sliding bearing surface 2-8, and the sliding bearing surface 2-8 is used to reduce sliding friction. The upper box 2-2 has a plurality of slide grooves 2-9 that penetrate the upper and lower surfaces, the lower bottom surface has a sliding bearing surface 2-8 corresponding to the sliding bearing surface of the lower box 2-1, and the upper top surface has a raised pull ring 2-10. The guide fixing component 2-3 is mainly composed of a plurality of large-sized long bolts 2-11 and gaskets 2-12. When the upper box 2-2 needs to be adjusted, the long bolts 2-11 are loosened; when the adjustment is completed, the long bolts 2-11 are tightened to prevent the upper box 2-2 from sliding during operation. One end of the adjustment pull rope 2-4 is connected to the boom, and the other end is connected to the pull ring 2-10 on the top surface of the upper box 2-2, and the upper box 2-2 is pulled forward and backward by the movement of the boom. There is an annular groove on the circumference of the pulley 2-5, and the adjustment rope 2-4 can be stuck in the groove. It is mainly used to change the direction of the tension of the adjustment rope 2-4 to achieve the backward movement of the upper box 2-2. There is a round hole in the center. The bottom plate of the pulley bracket 2-6 is connected with the middle long bolt 2-11. The two side plates of the pulley bracket 2-6 have concentric holes. The pulley 2-5 is located in the middle of the two side plates. The pulley center and the bracket center are strung together using a pin shaft. The pulley 2-5 can only rotate around the axis. When the upper box 2-2 needs to be moved from the back to the front, the pull rope 2-4 does not need to pass through the pulley 2-5, and is directly connected to the upper box 2-2 and the boom.

[0048] The invention has a simple structure, little change to the existing structure, strong versatility, and low cost. It is easy to adjust and operate, and can meet most working conditions. Installation and adjustment do not require additional lifting equipment, and do not affect the operating weight of the whole machine, do not increase transportation costs, and are convenient for cleaning vehicles, achieving multiple goals at one stroke.

[0049] It should be noted that the present invention does not use a hydraulic cylinder for reversing adjustment because the hydraulic cylinder is only a displacement adjustment mechanism and cannot withstand the huge inertial impact and yaw torque of the upper box. Long bolts are still required to press the upper and lower boxes, and the adjustment time is not advantageous. In addition, the hydraulic cylinder also needs to be added with a reversing control valve, a hose, etc., which is costly, occupies a large installation space, and has various time-limited risks such as oil leakage.

[0050] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0051] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present invention and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by this application.

[0052] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the present invention can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. An excavator with adjustable center of gravity, characterized in that: include: The undercarriage X-frame comprises a centrally located slewing device, four legs extending outward from the slewing device, and two longitudinal beams arranged in parallel and symmetrically and connected to the two legs respectively; the four legs are all hollow structures; A water bag made of a flexible material is placed in the cavity of each leg. The water bag is provided with at least one water valve switch. The legs are provided with openings at positions opposite to the water valve switches. The water bag is filled with water or drained with water through the at least one water valve switch to increase or decrease the weight of the vehicle. The combined counterweight includes a lower box body, an upper box body and an actuator. The lower box body is fixed on the turntable, and the upper box body is slidably connected to the lower box body. By operating the actuator, the upper box body is driven to adjust its front and rear position relative to the lower box body in the direction of travel of the excavator, thereby adjusting the center of gravity position of the entire machine.

2. The excavator with adjustable center of gravity according to claim 1, characterized in that: Two openings are respectively provided on the front facades of the two legs along the forward direction of the excavator and the rear inner surfaces of the two legs along the backward direction of the excavator, and the water storage bag is respectively provided with a water valve switch at the two opposite openings; one of the water valve switches is used as a water injection valve, and the other water valve switch is used as a drainage valve.

3. The excavator with adjustable center of gravity according to claim 2, characterized in that: One opening on the support leg is arranged at a position close to the rotating device, and the other opening on the support leg is arranged at a position close to the longitudinal beam; the opening position close to the rotating device is higher than the opening position close to the longitudinal beam, the water injection valve is arranged at the opening close to the rotating device, and the drainage valve is arranged at the opening close to the longitudinal beam.

4. The excavator with adjustable center of gravity according to claim 1, characterized in that: A sealing cover is installed at the opening of the support leg, and the sealing cover can completely cover the opening. The water valve switch is operated by opening the sealing cover, and the support leg is sealed by closing the sealing cover.

5. The excavator with adjustable center of gravity according to claim 4, characterized in that: The sealing cover plate is fixed to the support leg at the opening by means of circumferential bolts; or, one end of the sealing cover plate is hinged to the support leg at the opening by a hinge, and the other end is fixed by a plurality of bolts.

6. The excavator with adjustable center of gravity according to claim 1, characterized in that: The bottom plane of the upper box body and the top plane of the lower box body are both provided with a plurality of sliding bearing surfaces which are arranged in parallel at intervals and opposite to each other and are used to reduce the sliding friction between the upper and lower boxes.

7. The excavator with adjustable center of gravity according to claim 1, characterized in that: A guide fixing component is provided between the lower box body and the upper box body, which enables the upper box body to move forward and backward along the driving direction of the excavator and fixes the upper box body on the lower box body after movement.

8. The excavator with adjustable center of gravity according to claim 7, characterized in that: The top surface of the lower box body is provided with a plurality of threaded holes spaced apart along its length direction; the upper box body is provided with a plurality of slide grooves spaced apart along its length direction and passing through its upper and lower sides, and one slide groove corresponds to one threaded hole; Each group of slide grooves and threaded holes cooperates with a long bolt to form the guide and fixing component. The long bolt passes through the slide groove and is screwed into the threaded hole. The slide groove cooperates with the loosened long bolt to realize the linear guide function. The tightened long bolt fixes the upper box body to the lower box body.

9. The excavator with adjustable center of gravity according to claim 8, characterized in that: The guide fixing component also includes a gasket, which is located on the top surface of the upper box body and is coaxially arranged with the threaded hole. The long bolt first passes through the gasket, then passes through the sliding groove and is screwed into the threaded hole.

10. The excavator with adjustable center of gravity according to claim 7, characterized in that: The execution component includes: A pull ring is fixed in the middle area of ​​the upper box body and close to the front edge; A steering assembly is mounted on the guide fixing component located in the middle area of ​​the upper box body; Pull rope, when the upper box body needs to move forward relative to the lower box body, one end of the pull rope is connected to the movable arm, and the other end of the pull rope is connected to the pull ring, and the upper box body is pulled forward by the movement of the movable arm; when the upper box body needs to move backward relative to the lower box body, one end of the pull rope is connected to the movable arm, and the other end of the pull rope is first connected to the steering assembly and then to the pull ring, and the upper box body is pulled backward by the movement of the movable arm.

11. The excavator with adjustable center of gravity according to claim 10, characterized in that: The steering assembly comprises: The pulley bracket is composed of a bottom plate and two side plates fixed to the top surface of the bottom plate and extending vertically upward therefrom. The bottom plate is provided with a mounting hole for fixing to the guide fixing member, and each of the two side plates is provided with a coaxially arranged reaming hole. The pulley is provided with a circumferentially extending annular groove. The pulley is rotatably supported between the two side plates through the cooperation of a pin shaft and a reamer hole. The pull rope is connected to the pull ring after passing around the pulley, thereby changing the pulling direction of the pull rope.

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