Counterweight device, counterweight method and working machine

Abstract

The present application relates to the technical field of mechanical counterweight, and provides a counterweight device, a counterweight method and a working machine, the counterweight device comprising a counterweight body, which is hinged to a rotating platform at a hinge point; a counterweight oil cylinder, one end of which is hinged to the rotating platform and the other end of which is hinged to the counterweight body; a bucket rod oil cylinder, one end of which is hinged to a bucket rod and the other end of which is hinged to a movable arm; and a hydraulic system for controlling the counterweight oil cylinder and the bucket rod oil cylinder, under the action of the hydraulic system, the counterweight oil cylinder can be elongated or shortened with the shortening or elongation of the bucket rod oil cylinder, so that the counterweight body can rotate around the hinge point to the direction away from or close to the bucket rod, and the center of gravity of the counterweight body moves backward or forward. The present application can automatically adjust the counterweight center of gravity according to the state of the bucket rod, so that the anti-rollover ability of the whole machine is not a fixed ability. The structure of the present application, which can realize the backward tilting of the counterweight and the backward movement of the center of gravity, has a smaller rotating radius compared with the scheme of the overall backward movement of the counterweight.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical counterweight, and particularly relates to a counterweight device, a counterweight method and a working machine. BACKGROUND

[0002] With the diversified application development of working machines, the structure of working machines tends to be fine, humanized and convenient to maintain. For example, taking excavators as an example, the excavator is a kind of earthmoving machine which uses a shovel to excavate materials higher or lower than the surface of the machine and loads the materials into a transport vehicle or unloads the materials to a stockpile site. The materials excavated by the excavator are mainly soil, coal, sand and soil and rock after pre-loosening. From the development of engineering machinery in recent years, the development of excavators is relatively fast, and the excavator has become one of the most important engineering machinery in engineering construction. The three most important parameters of the excavator are operating weight (mass), engine power and shovel capacity. When the excavator is used, a counterweight is installed on the vehicle body to balance the vehicle and avoid tilting of the vehicle.

[0003] In the prior art, the center of gravity of the counterweight of the excavator is high, and the position of the counterweight cannot be adjusted, so that the stability of the excavator during use is poor. SUMMARY

[0004] The present application provides a counterweight device, a counterweight method and a working machine to solve the defects of high center of gravity of the counterweight of the working machine, the position of the counterweight cannot be adjusted, and the stability of the working machine during use is poor, so that the center of the counterweight is moved backward during the working of the working machine, and the stability during the working is improved.

[0005] The present application provides a counterweight device arranged on a slewing platform of a working machine, comprising:

[0006] A counterweight body is hinged to the slewing platform at a hinge point;

[0007] A counterweight oil cylinder is hinged at one end to the slewing platform and at the other end to the counterweight body;

[0008] A boom cylinder is hinged at one end to the boom and at the other end to the swing arm;

[0009] A hydraulic system is used to control the counterweight oil cylinder and the boom cylinder, and under the action of the hydraulic system, the counterweight oil cylinder can be elongated or shortened with the shortening of the boom cylinder.

[0010] According to the counterweight device provided by the present application, the hydraulic system comprises:

[0011] An oil tank;

[0012] A hydraulic pump in communication with the oil tank;

[0013] The first reversing valve is communicated with the hydraulic pump at a main oil inlet, communicated with a rod cavity of the arm cylinder at a first working oil port, communicated with a rodless cavity of the arm cylinder at a second working oil port, and communicated with the oil tank at a return oil port.

[0014] The first reversing valve comprises a first working position and a second working position.

[0015] The first reversing valve further comprises a third working position.

[0016] The hydraulic system further comprises:

[0017] The second reversing valve comprises a first working position and a second working position.

[0018] When the second reversing valve is at the first working position, the first working oil port is unidirectionally communicated with the rod cavity of the arm cylinder, the rod cavity of the arm cylinder is communicated with the rodless cavity of the counterweight cylinder, the second working oil port is unidirectionally communicated with the rodless cavity of the arm cylinder, and the rodless cavity of the arm cylinder is communicated with the rod cavity of the counterweight cylinder.

[0019] When the second reversing valve is at the second working position, the first working oil port is bidirectionally communicated with the rod cavity of the arm cylinder, the second working oil port is bidirectionally communicated with the rodless cavity of the arm cylinder, and the arm cylinder and the counterweight cylinder are cut off.

[0020] The hydraulic system further comprises:

[0021] A hydraulic lock is arranged between the arm cylinder and the counterweight cylinder.

[0022] The counterweight device further comprises:

[0023] A first hinging seat and a second hinging seat are arranged at two ends of the counterweight body respectively, and the first hinging seat and the second hinging seat are connected with the slewing platform.

[0024] A third hinging seat is arranged at a middle part of the counterweight body, and the third hinging seat is connected with the counterweight cylinder.

[0025] The present application further provides a counterweight method, which comprises a counterweight adjusting mode.

[0026] The counterweight cylinder and the arm cylinder are communicated with the hydraulic system.

[0027] Under the action of the hydraulic system, the counterweight oil cylinder is elongated with the shortening of the boom oil cylinder, the counterweight body can rotate around the hinge point to the direction away from the boom, so that the center of gravity of the counterweight body moves backward; the counterweight oil cylinder is shortened with the elongation of the boom oil cylinder, the counterweight body can rotate around the hinge point to the direction close to the boom, so that the center of gravity of the counterweight body moves forward.

[0028] According to the counterweight method provided by the application, the method further comprises:

[0029] Switching the counterweight adjustment mode to a locking mode;

[0030] The locking mode comprises:

[0031] When the center of gravity of the counterweight body is adjusted to a proper angle, the counterweight oil cylinder is cut off from the hydraulic system, and the inclination angle of the counterweight body is fixed.

[0032] According to the counterweight method provided by the application, the switching of the counterweight adjustment mode to the locking mode comprises:

[0033] The switching between the counterweight adjustment mode and the locking mode is realized by switching the working position of the reversing valve.

[0034] The counterweight device and the counterweight method provided by the application have the following advantages: the counterweight body is hinged to the slewing platform at a hinge point, one end of the counterweight oil cylinder is hinged to the slewing platform, and the other end is hinged to the counterweight body; one end of the boom is hinged to the boom, and the other end is hinged to the boom arm; under the action of the hydraulic system, the counterweight oil cylinder can be elongated with the shortening of the boom oil cylinder, so that the counterweight body can rotate around the hinge point to the direction away from the boom, and then the center of gravity of the counterweight body moves backward; the inclination angle of the counterweight body is adjusted by the extension distance of the boom, so that the center of gravity of the counterweight body moves backward, and the stability during the working process of the working machine is increased; when the work is finished, the counterweight oil cylinder can be shortened with the elongation of the boom oil cylinder, so that the counterweight body can rotate around the hinge point to the direction close to the boom, and then the center of gravity of the counterweight body moves forward, and the counterweight body returns to the initial state; the center of gravity of the counterweight can be automatically adjusted according to the state of the boom, so that the anti-rollover ability of the whole machine is not a fixed ability; compared with the scheme that the whole counterweight moves backward, the slewing radius is small.

[0035] The application further provides a working machine, which has the advantages described above because the working machine comprises the counterweight device described above. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings needed to be used in the following embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0037] Figure 1 is one of the installation schematic diagrams of the counterweight device provided by the present application;

[0038] Figure 2 is the second installation schematic diagram of the counterweight device provided by the present application;

[0039] Figure 3 is the hydraulic principle diagram of the counterweight device provided by the present application;

[0040] Reference signs:

[0041] 1, counterweight body; 2, counterweight oil cylinder; 3, arm oil cylinder; 4, oil tank; 5, hydraulic pump; 6, first reversing valve; 7, second reversing valve; 8, hydraulic lock; 9, first hinged seat; 10, second hinged seat; 11, third hinged seat; 12, hinged point;

[0042] 100, rotating platform; 200, arm; 300, boom. DETAILED DESCRIPTION

[0043] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the present application.

[0044] In the description of the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by the terms “center”, “longitudinal”, “transverse”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms “first”, “second”, “third” are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0045] The following will be described in combination with Figures 1 to 3The embodiment of the first aspect of the present application is described, and the embodiment of the first aspect of the present application is to provide a counterweight device.

[0046] As shown in Figure 1 and Figure 2 The counterweight device provided by the embodiment of the first aspect of the present application is arranged on the slewing platform 100 of the working machine, and includes a counterweight body 1, a counterweight oil cylinder 2, a bucket arm oil cylinder 3, and a hydraulic system.

[0047] The counterweight body 1 is hinged to the slewing platform 100 at a hinge point 12, and the initial state of the counterweight body 1 can be a vertical state. One end of the counterweight oil cylinder 2 is hinged to the slewing platform 100, and the other end is hinged to the counterweight body 1. The counterweight body 1 can rotate around the hinge point with the extension and retraction of the counterweight oil cylinder 2. One end of the bucket arm oil cylinder 3 is hinged to the bucket arm 200, and the bucket arm 200 can swing within a certain range, which facilitates various operations of the working machine. The other end of the bucket arm oil cylinder 3 is hinged to the movable arm 300, so that the movable arm 300 can perform pitching and rotating movements within a certain range, thereby improving the operation efficiency and adaptability of the working machine. Through the extension and retraction of the bucket arm oil cylinder 3, the included angle between the bucket arm 200 and the movable arm 300 can be controlled, and various operation actions of the working machine can be realized, such as excavation, loading, unloading, etc.

[0048] The hydraulic system is used to control the counterweight oil cylinder 2 and the bucket arm oil cylinder 3. Under the action of the hydraulic system, the counterweight oil cylinder 2 can be elongated or shortened with the shortening or elongation of the bucket arm oil cylinder 3, so that the counterweight body 1 can rotate around the hinge point 12 in the direction away from or close to the bucket arm 200, and the center of gravity of the counterweight body 1 moves backward or forward. This means that when the bucket arm oil cylinder 3 is shortened, the counterweight oil cylinder 2 will be correspondingly elongated, so that the counterweight body 1 rotates around the hinge point 12 in the direction away from the bucket arm 200. This rotation causes the center of gravity of the counterweight body 1 to move backward. Conversely, when the bucket arm oil cylinder 3 is elongated, the counterweight oil cylinder 2 will be correspondingly shortened, so that the counterweight body 1 rotates around the hinge point 12 in the direction close to the bucket arm 200, causing the center of gravity of the counterweight body 1 to move forward.

[0049] The embodiment of the present application adjusts the inclination angle of the counterweight body 1 by adjusting the extension distance of the bucket arm 200, so that the center of gravity of the counterweight body 1 moves backward, thereby increasing the stability of the working machine during operation. After the operation is completed, the counterweight oil cylinder 2 can be shortened with the elongation of the bucket arm oil cylinder 3, so that the counterweight body 1 can rotate around the hinge point 12 in the direction close to the bucket arm 200, and then the center of the counterweight body 1 moves forward to return to the initial state. The center of gravity of the counterweight can be automatically adjusted according to the state of the bucket arm, so that the anti-rollover ability of the whole machine is not a fixed ability. Compared with the scheme of moving the whole counterweight backward, the slewing radius is small.

[0050] As shown in Figure 3As shown, in one possible embodiment of the present application, the hydraulic system includes an oil tank 4, a hydraulic pump 5, and a first directional valve 6. The oil tank 4 is the oil outlet device of the hydraulic system, used to store hydraulic oil and provide sufficient oil for the normal operation of the entire hydraulic system. The hydraulic pump 5 communicates with the oil tank 4 and is the power source of the hydraulic system. The hydraulic pump 5 sucks in hydraulic oil from the oil tank 4 and delivers it to various parts of the hydraulic system after being pressurized. The output pressure and flow rate of the hydraulic pump 5 can be adjusted as needed to meet the working requirements of the boom cylinder 3 and the counterweight cylinder 2. The main inlet port P of the first directional valve 6 communicates with the hydraulic pump 5, the first working oil port A communicates with the rod cavity of the boom cylinder 3, the second working oil port B communicates with the rodless cavity of the boom cylinder 3, and the return oil port T communicates with the oil tank 4. By controlling the state of the first directional valve 6, the extension and retraction movement of the boom cylinder 3 can be achieved. When the first directional valve 6 is in a certain state, hydraulic oil flows from the hydraulic pump 5 through the main inlet port, then enters the rod cavity of the boom cylinder 3 through the first working oil port, and pushes the boom 200 to move. At the same time, the hydraulic oil in the rodless cavity of the boom cylinder 3 flows back to the first directional valve 6 through the second working oil port, and finally returns to the oil tank 4. When it is necessary to change the movement direction of the boom 200, the flow direction of the hydraulic oil can be changed by adjusting the state of the first directional valve 6, thereby realizing the reverse movement of the boom 200.

[0051] Therefore, the hydraulic system provides power through the hydraulic pump 5 and controls the flow direction of the hydraulic oil through the first directional valve 6, thereby driving the extension and retraction movement of the boom cylinder 3, and further realizing various working actions of the working machine. At the same time, the hydraulic system can also provide stable pressure and flow rate as needed to ensure that the working machine can work stably and efficiently in complex working environments.

[0052] The first directional valve 6 includes a first working position and a second working position. When the first directional valve 6 is in the first working position, the rodless cavity of the boom cylinder 3 is supplied with oil. When the first directional valve 6 is in the second working position, the rod cavity of the boom cylinder 3 is supplied with oil.

[0053] When the first directional valve 6 is in the first working position, hydraulic oil flows from the hydraulic pump 5 through the main inlet port P of the first directional valve 6, and then enters the rodless cavity of the boom cylinder 3. This means that the piston rod of the boom cylinder 3 will extend outward under the push of the hydraulic oil, thereby driving the boom 200 to swing outward. This state is usually used to control the boom 200 to perform digging, loading and other working actions.

[0054] When the first directional valve 6 is in the second working position, hydraulic oil also flows from the hydraulic pump 5 through the main inlet port P of the first directional valve 6, but this time it enters the rod cavity of the boom cylinder 3. This means that the piston rod of the boom cylinder 3 will retract inward under the push of the hydraulic oil, thereby driving the boom 200 to swing inward. This state is usually used to control the boom 200 to perform slewing, unloading and other working actions.

[0055] In a feasible embodiment of the present invention, the first directional valve 6 further includes a third working position. When the first directional valve 6 is in the third working position, neither the rodless chamber nor the rod chamber of the boom cylinder 3 receives oil. In this state, the piston rod of the boom cylinder 3 does not move, and the boom 200 stops moving. This design is typically used to control the boom 200 to remain stationary under specific operational requirements, such as during the loading or unloading of machinery, where the position of the boom 200 needs to remain unchanged.

[0056] By switching the working position of the first directional valve 6, the oil inlet direction and flow rate of the boom cylinder 3 can be flexibly controlled, thereby achieving precise control of the boom 200. This design enables the operating machinery to adapt to various complex operating environments and needs, improving operating efficiency and stability. At the same time, the pressure and flow regulation functions of the hydraulic system can be adjusted in real time according to the load and operating requirements of the operating machinery, ensuring that the operating machinery can operate stably and reliably under various complex environments and working conditions.

[0057] In a feasible embodiment of the present invention, the hydraulic system further includes a second directional valve 7, comprising a first working position and a second working position; when the second directional valve 7 is in the first working position, the first working port is unidirectionally connected to the rod chamber of the boom cylinder 3, and the rod chamber of the boom cylinder 3 is connected to the rodless chamber of the counterweight cylinder 2; the second working port is unidirectionally connected to the rodless chamber of the boom cylinder 3, and the rodless chamber of the boom cylinder 3 is connected to the rod chamber of the counterweight cylinder 2; when the second directional valve 7 is in the second working position, the first working port is bidirectionally connected to the rod chamber of the boom cylinder 3, and the second working port is bidirectionally connected to the rodless chamber of the boom cylinder 3; the boom cylinder 3 and the counterweight cylinder 2 are cut off; when the counterweight body 1 is tilted to a suitable angle, the second working position of the second directional valve 7 is activated, so that the extension and retraction of the boom cylinder 3 will not affect the extension and retraction of the counterweight cylinder, thus locking the tilt angle of the counterweight body 1.

[0058] like Figure 3 As shown, in a feasible embodiment of the present invention, the hydraulic system further includes a hydraulic lock 8, which is disposed between the boom cylinder 3 and the counterweight cylinder 2. The hydraulic lock 8 prevents the counterweight cylinder 2 from sinking. Specifically, the hydraulic lock 8 locks the oil passages of the boom cylinder 3 and the counterweight cylinder 2, preventing the flow of hydraulic oil and thus keeping the piston rod in a constant position. This design ensures that during operation, especially when performing digging, loading, and unloading actions, the boom 200 and the counterweight body 1 can be stably maintained in the required position, improving operational accuracy and stability.

[0059] The hydraulic lock 8 usually adopts the structure of a double hydraulic control check valve or a bidirectional hydraulic control valve, and the oil path is opened or closed by controlling the movement of the valve core, so as to realize the locking function of the hydraulic oil. This design can effectively prevent the piston rod from moving accidentally when it is disturbed externally, and improve the safety and stability of the working machine.

[0060] In a feasible embodiment of the present application, a first hinged seat 9, a second hinged seat 10 and a third hinged seat 11 are further included. The first hinged seat 9 and the second hinged seat 10 are respectively arranged at the two ends of the counterweight body 1, and the first hinged seat 9 and the second hinged seat 10 are connected with the slewing platform 100. This design is to realize the flexible rotation between the counterweight body 1 and the slewing platform 100, and meet the needs of the working machine in various working environments and working conditions.

[0061] The first hinged seat 9 and the second hinged seat 10 are usually made of high-strength materials, have sufficient rigidity and strength, and can bear the weight of the counterweight body 1 and various external forces in the working process. At the same time, these hinged seats also have good wear resistance and corrosion resistance, and can ensure a long service life.

[0062] Through the connection of the first hinged seat 9 and the second hinged seat 10 with the slewing platform 100, the counterweight body 1 can perform pitching and rotating movements around the rotation center. This design makes the working machine better adapt to the terrain and working requirements during the working process, and improves the working efficiency and stability. At the same time, this connection method can also reduce the overall size of the working machine, facilitating transportation and operation.

[0063] The third hinged seat 11 is arranged at the middle part of the counterweight body 1, and the third hinged seat 11 is connected with the counterweight cylinder 2. Through the connection of the third hinged seat 11 and the counterweight cylinder 2, the counterweight body 1 can perform pitching movement around a certain center point. This design allows the counterweight body 1 to swing up and down within a certain range, helping the working machine better adapt to the needs of the excavating operation.

[0064] The counterweight device provided by the first aspect embodiment of the present application can automatically adjust the gravity center of the counterweight according to the state of the arm, so that the anti-tilting ability of the whole machine is not a fixed ability. In the initial position, the arm cylinder 3 is fully extended, and the counterweight body 1 is correspondingly arranged vertically. When the arm 200 is extended and the arm cylinder 3 is fully retracted, the counterweight cylinder 2 is extended, the counterweight is tilted, the gravity center is moved backward, and the working stability is improved. This structure can realize the backward tilting of the counterweight body and the backward movement of the gravity center, and compared with the scheme of moving the whole counterweight body backward, the slewing radius is smaller.

[0065] The second aspect embodiment of the present application provides a counterweight method, which utilizes the counterweight device provided by the first aspect embodiment of the present application, and includes a counterweight adjustment mode. The counterweight adjustment mode includes the following steps:

[0066] S110, both the counterweight oil cylinder 2 and the boom oil cylinder 3 are communicated with the hydraulic system.

[0067] The hydraulic system can drive the counterweight oil cylinder 2 and the boom oil cylinder 3 to perform corresponding actions by controlling the flow of hydraulic oil.

[0068] S120, under the action of the hydraulic system, the counterweight oil cylinder 2 is elongated with the shortening of the boom oil cylinder 3, and the counterweight body 1 can rotate around the hinge point 12 to move away from the boom 200, so that the center of gravity of the counterweight body 1 moves backward; the counterweight oil cylinder 2 is shortened with the elongation of the boom oil cylinder 3, and the counterweight body 1 can rotate around the hinge point 12 to move close to the boom 200, so that the center of gravity of the counterweight body 1 moves forward.

[0069] The hydraulic system plays a crucial role in the working machine, which controls the movement of the counterweight oil cylinder 2 and the boom oil cylinder 3 to realize various working actions of the working machine.

[0070] When the boom oil cylinder 3 is shortened, the hydraulic system drives the counterweight oil cylinder 2 to elongate. Due to the connection of the counterweight body 1 with the first hinge seat 9 and the second hinge seat 10, the counterweight body 1 will rotate around the hinge point 12 to move away from the boom 200. This rotation causes the center of gravity of the counterweight body 1 to move backward, increasing the stability of the working machine and facilitating operations such as excavation and loading.

[0071] Conversely, when the boom oil cylinder 3 is elongated, the hydraulic system drives the counterweight oil cylinder 2 to correspondingly shorten. The counterweight body 1 will move around the hinge point 12 to move close to the boom 200. This movement causes the center of gravity of the counterweight body 1 to move forward, which helps to adjust the overall posture of the working machine to adapt to different working requirements.

[0072] In one feasible embodiment of the present application, it further includes a step S130 of switching the counterweight adjustment mode to a locking mode. In the locking mode, when the center of gravity of the counterweight body 1 is adjusted to a suitable angle, the counterweight oil cylinder 2 is cut off from the hydraulic system, and the inclination angle of the counterweight body 1 is fixed.

[0073] In the locking mode of the working machine, when the center of gravity of the counterweight body 1 is adjusted to a suitable angle, the hydraulic system will cut off the counterweight oil cylinder 2 from the hydraulic system, so that the inclination angle of the counterweight body 1 is fixed. This locking mode is to ensure that the working machine maintains a stable posture during operation, preventing changes in the working machine's posture due to external forces or vibrations, which affects the working precision and safety.

[0074] In the locking mode, the hydraulic system no longer supplies hydraulic oil to the counterweight oil cylinder 2, and the counterweight oil cylinder 2 can no longer extend and retract. In this way, the stable state of the counterweight body 1 at a certain inclination angle can be maintained, so that the working machine can better adapt to the terrain and working requirements during the working process.

[0075] It should be noted that in the locking mode, the sealing and connection firmness of the hydraulic system need to be checked regularly to ensure that the cutoff effect of the counterweight oil cylinder 2 and the hydraulic system is reliable. At the same time, the attitude change of the working machine needs to be paid attention to at all times during the working process, and the working state of the hydraulic system needs to be adjusted in a timely manner as needed to maintain the stability and working accuracy of the working machine.

[0076] In an embodiment of the present application, step S130 includes switching the working position of the second reversing valve 7 to realize switching between the counterweight adjustment mode and the locking mode. In the counterweight adjustment mode, the second reversing valve 7 is in the working position, allowing hydraulic oil in the hydraulic system to flow into the counterweight oil cylinder 2 through the second reversing valve 7. At this time, the counterweight oil cylinder 2 can extend and retract as needed to drive the counterweight body 1 to perform the luffing movement. By adjusting the extension and retraction amount of the counterweight oil cylinder 2, the inclination angle of the counterweight body 1 can be controlled to realize the gravity adjustment and attitude control of the working machine.

[0077] When it is necessary to switch the working machine to the locking mode, the second reversing valve 7 will be switched to another working position. In this working position, the second reversing valve 7 cuts off the oil passage between the counterweight oil cylinder 2 and the hydraulic system, stopping the inflow and outflow of hydraulic oil. In this way, the counterweight oil cylinder 2 can no longer extend and retract, the inclination angle of the counterweight body 1 is fixed, and the stable attitude of the working machine is maintained.

[0078] The third aspect of the present application provides a working machine comprising the counterweight device according to any one of the above embodiments.

[0079] The working machine provided by the third aspect of the present application, since comprising the counterweight device as described above, can automatically adjust the counterweight gravity according to the arm state, so that the anti-rollover ability of the whole machine is not a fixed ability. Compared with the scheme of moving the whole counterweight backward, the structure of moving the counterweight backward and moving the gravity backward has a smaller turning radius.

[0080] In the embodiments of the present application, the type of the working machine does not constitute a limitation, for example, the working machine can be an excavator, a crane, a loader, etc. In other words, as long as the working machine can use the counterweight device in the present application.

[0081] In the description of the embodiments of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "connected", "connection", should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0082] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "way", "specific way", or "some ways" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or way are included in at least one embodiment or way of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or way. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or ways in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or features of the embodiments or ways described in the present application without contradiction.

[0083] Finally, it should be noted that: the above embodiments 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 embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, 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 counterweight device provided on a slewing platform of a working machine, characterized by, The utility model relates to a kind of hydraulic excavator, comprising: Counterweight body, with the slewing platform is hinged in hinge point; Counterweight cylinder, one end is hinged with the slewing platform, the other end is hinged with the counterweight body; Arm cylinder, one end is hinged with arm, the other end is hinged with movable arm; Hydraulic system for controlling the counterweight cylinder and the arm cylinder, under the action of the hydraulic system, the counterweight cylinder can be elongated with the shortening of the arm cylinder or shortened with the elongation of the arm cylinder;The hydraulic system comprises: Oil tank; Hydraulic pump, in communication with the oil tank; First reversing valve, main oil inlet is communicated with the hydraulic pump, first working oil port is communicated with the arm cylinder rod cavity, second working oil port is communicated with the arm cylinder barrel cavity, return oil port is communicated with the oil tank; The first reversing valve includes first working position and second working position, when the first reversing valve is in first working position, the arm cylinder barrel cavity is in oil, when the first reversing valve is in second working position, the arm cylinder rod cavity is in oil; Second reversing valve, including first working position and second working position; When the second reversing valve is in first working position, the first working oil port is one-way communicated with the arm cylinder rod cavity, the arm cylinder rod cavity is communicated with the counterweight cylinder barrel cavity, the second working oil port is one-way communicated with the arm cylinder barrel cavity, the arm cylinder barrel cavity is communicated with the counterweight cylinder rod cavity; When the second reversing valve is in second working position, the first working oil port is two-way communicated with the arm cylinder rod cavity, the second working oil port is two-way communicated with the arm cylinder barrel cavity;The arm cylinder and the counterweight cylinder are cut off.

2. The counterweight device of claim 1, wherein, The first reversing valve further includes third working position, when the first reversing valve is in third working position, the arm cylinder barrel cavity and rod cavity are not in oil.

3. The counterweight device of claim 1, wherein, The hydraulic system further comprises: Hydraulic lock, is arranged between the arm cylinder and the counterweight cylinder.

4. The counterweight device of claim 1, wherein, Further comprising: First hinged seat and second hinged seat are arranged on both ends of the counterweight body respectively;And the first hinged seat and the second hinged seat are connected with the slewing platform; Third hinged seat, arranged in the middle of the counterweight body, and the third hinged seat is connected with the counterweight cylinder.

5. A counterweight method using the counterweight device according to any one of claims 1 to 4, characterized by, The counterweight adjusting mode comprises the steps of: The counterweight cylinder and the arm cylinder are communicated with the hydraulic system; Under the action of the hydraulic system, the counterweight cylinder is elongated with the shortening of the arm cylinder, and the counterweight body can rotate around the hinge point to the direction away from the arm to make the center of gravity of the counterweight body move backward;The counterweight cylinder is shortened with the elongation of the arm cylinder, and the counterweight body can move around the hinge point to the direction close to the arm to make the center of gravity of the counterweight body move forward.

6. The counterweight method of claim 5, wherein, Further comprising: Switching the counterweight adjusting mode to the locking mode; Wherein, the locking mode comprises: When the center of gravity of the counterweight body is adjusted to the appropriate angle, the counterweight cylinder is cut off with the hydraulic system, and the inclination angle of the counterweight body is fixed.

7. The counterweight method of claim 6, wherein, The switching of the counterweight adjusting mode to the locking mode comprises: Switching working position through the second reversing valve, to realize the switching between the counterweight adjusting mode and the locking mode.

8. A work machine characterized by, The counterweight device according to any one of claims 1 to 4.

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