Working arm floating system and working machine

Abstract

The utility model relates to the technical field of engineering machinery, and provides a working arm floating system and an operating machine, the system comprises a hydraulic oil tank, an oil cylinder control valve and a floating control valve, the working positions of the floating control valve comprise a first working position and a second working position, at the first working position, the oil cylinder control valve is communicated with a rod cavity of the working arm oil cylinder and a rodless cavity of the working arm oil cylinder through the floating control valve, and at the second working position, the hydraulic oil tank is communicated with the rod cavity and the rodless cavity of the working arm oil cylinder through the floating control valve. According to the utility model, the opening and closing of the floating function are realized through the switching of the floating control valve between the two working stations, and after the floating is closed, the oil cylinder control valve is connected to the working arm oil cylinder through the floating control valve, so that the working arm oil cylinder can extend or retract; the opening and closing of the floating function are realized by switching the working positions of the floating control valve, so that the redundant action of automatically withdrawing the working arm oil cylinder is avoided, the use safety is further improved, and the defect that the safety risk is easy to generate in the prior art is overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of construction machinery, in particular to a working arm floating system and a working machine. Background Art

[0002] As a widely used construction machinery product, the working arm and bucket of a loader are hinged to form a working device. The working device is driven by a working arm cylinder and a bucket cylinder to realize the loading action. Coupled with the slewing and traveling actions, the actions are flexible and diverse, suitable for various complex working conditions and functional requirements. To facilitate the operation, reduce the driver's operation difficulty and working intensity, and improve the working efficiency, generally, the working arm of the loader needs to be in a floating state.

[0003] In the prior art, to realize the floating function of the working arm, a fourth position is added to the working arm control valve of the loader, and the floating of the working arm is realized through the fourth position. However, after the floating is released, during the process of the control handle returning to the middle position (the second position), it must pass through the working arm lowering position (the third position), and the working arm cylinder automatically retracts. This is an unnecessary action and is prone to safety risks. Summary of the Utility Model

[0004] The utility model provides a working arm floating system and a working machine to solve the defect of easy generation of safety risks in the prior art when the floating is released.

[0005] The utility model provides a working arm floating system, including:

[0006] A hydraulic oil tank;

[0007] An oil cylinder control valve;

[0008] A floating control valve, the working positions of the floating control valve include a first working position and a second working position. In the first working position, the oil cylinder control valve is connected to the rod chamber and the rodless chamber of the working arm cylinder through the floating control valve. In the second working position, the hydraulic oil tank is connected to the rod chamber and the rodless chamber of the working arm cylinder through the floating control valve.

[0009] According to a working arm floating system provided by the utility model, the floating control valve includes a first connection end, a second connection end, a third connection end, a fourth connection end, a fifth connection end, a sixth connection end and a seventh connection end;

[0010] In the first working position, the first connection end and the second connection end are respectively connected to two working oil ports of the oil cylinder control valve, the third connection end and the fourth connection end are respectively connected to the rod chamber and the rodless chamber of the working arm cylinder, the first connection end and the third connection end are communicated, and the second connection end and the fourth connection end are communicated;

[0011] In the second working position, the fifth connection end and the sixth connection end are respectively connected to the rod chamber of the working arm oil cylinder and the rodless chamber of the working arm oil cylinder, the seventh connection end is connected to the hydraulic oil tank, and the fifth connection end, the sixth connection end and the seventh connection end are in communication.

[0012] A working arm floating system provided by the present invention further includes a control module, the control module is connected to the floating control valve, and the control module is used to control the floating control valve to work in the second working position when receiving a floating instruction.

[0013] For a working arm floating system provided by the present invention, the oil cylinder control valve has a first control position, a second control position and a third control position. In the first control position, the oil cylinder control valve is connected to the rod chamber of the working arm oil cylinder and the rodless chamber of the working arm oil cylinder through the floating control valve, and the working arm oil cylinder works in the extended state;

[0014] In the second control position, the oil cylinder control valve and the floating control valve are disconnected;

[0015] In the third control position, the oil cylinder control valve is connected to the rod chamber of the working arm oil cylinder and the rodless chamber of the working arm oil cylinder through the floating control valve, and the working arm oil cylinder works in the retracted state.

[0016] For a working arm floating system provided by the present invention, the control position of the oil cylinder control valve is actuated by an operating handle, the operating handle includes a first position, a second position and a third position, the first position corresponds to the first control position, the second position corresponds to the second control position, and the third position corresponds to the third control position.

[0017] For a working arm floating system provided by the present invention, the first position and / or the third position has a preset stroke.

[0018] For a working arm floating system provided by the present invention, the control module is connected to the operating handle, and the control module is used to monitor the position of the operating handle.

[0019] For a working arm floating system provided by the present invention, the operating handle is provided with a position measuring element, and the position measuring element is connected to the control module. A working arm floating system provided by the present invention further includes a floating control button connected to the control module.

[0020] The present invention also provides a working machine, including the working arm floating system described in any one of the above.

[0021] The working arm floating system provided by the present utility model sets a floating control valve between the oil cylinder control valve and the working arm oil cylinder. The floating control valve has two working positions. By switching the floating control valve between the two working positions, the opening and closing of the floating function are realized. After the floating is closed, the oil cylinder control valve is connected to the rod chamber of the working arm oil cylinder and the rodless chamber of the working arm oil cylinder through the floating control valve, and the working arm oil cylinder is in the conventional working mode, and the oil cylinder can be extended or retracted. In this way, the opening and closing of the floating function are realized by switching the working positions of the floating control valve, thus avoiding the redundant action of the automatic retraction of the working arm oil cylinder, and further improving the use safety.

[0022] Further, in the construction machinery provided by the present utility model, due to having the working arm floating system as described above, it also has various advantages as described above. Brief Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is one of the schematic diagrams of the principle structure of the working arm floating system provided by the present utility model.

[0025] Figure 2 It is the second schematic diagram of the principle structure of the working arm floating system provided by the present utility model.

[0026] Figure 3 It is the third schematic diagram of the principle structure of the working arm floating system provided by the present utility model.

[0027] Figure 4 It is the fourth schematic diagram of the principle structure of the working arm floating system provided by the present utility model.

[0028] Figure 5 It is the schematic diagram of the structure of the oil cylinder control valve provided by the present utility model.

[0029] Figure 6 It is the schematic diagram of the structure of the floating control valve provided by the present utility model.

[0030] Reference Numerals: 1, hydraulic oil tank; 2, cylinder control valve; 21, first control position; 22, second control position; 23, third control position; 3, floating control valve; 31, first working position; 32, second working position; 4, working arm cylinder; 41, rodless cavity; 42, rod cavity; 5, control module; 6, operating handle; 61, first position; 62, second position; 63, third position; 7, floating control button; 8, working pump. Detailed Embodiment

[0031] The following further describes in detail the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0032] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "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 directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0034] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0035] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0036] The following combines Figures 1 - 6 to describe the working arm floating system of the embodiments of the present utility model.

[0037] An embodiment of the first aspect of the present utility model provides a working arm floating system, as Figure 1 and Figure 2 shown. Figure 1 In Figure 1 , the working arm floating system is in the initial state. Figure 2 In Figure 2 , the working arm floating system is in the floating state. The working arm floating system includes a hydraulic oil tank 1, an oil cylinder control valve 2, a floating control valve 3, and a working arm oil cylinder 4.

[0038] Among them, the working positions of the floating control valve 3 include a first working position 31 and a second working position 32, and the floating control valve 3 is adapted to switch between the first working position 31 and the second working position 32; as Figure 1 shown, in the first working position 31, the oil cylinder control valve 2 is connected to the rod chamber 42 of the working arm oil cylinder 4 and the rodless chamber 41 of the working arm oil cylinder 4 through the floating control valve 3; as Figure 2 shown, in the second working position 32, the hydraulic oil tank 1 is connected to the rod chamber 42 of the working arm oil cylinder 4 and the rodless chamber 41 of the working arm oil cylinder 4 through the floating control valve 3.

[0039] It can be understood that the oil cylinder control valve 2 is connected to the working arm oil cylinder 4 through the floating control valve 3. The floating control valve 3 has a first working position 31 and a second working position 32. When the floating control valve 3 is in the first working position 31, the oil cylinder control valve 2 is connected to the rod chamber 42 of the working arm oil cylinder 4 and the rodless chamber 41 of the working arm oil cylinder 4 through the floating control valve 3, and the oil cylinder control valve 2 is also connected to the hydraulic oil tank 1. Then, the working arm oil cylinder 4 is in the normal working mode, and the oil cylinder can be extended or retracted, so that the working arm is in the lifting state or the lowering state. Referring to Figure 3 and Figure 4 , Figure 3 in Figure 3 , the oil cylinder is in the extended state. Figure 4 in Figure 4 , the oil cylinder is in the retracted state.

[0040] When it is necessary to realize the floating of the working arm, the working position of the floating control valve 3 is switched from the first working position 31 to the second working position 32. At this time, the floating control valve 3 and the oil cylinder control valve 2 are disconnected, and the rod chamber 42 and the rodless chamber 41 of the working arm oil cylinder 4 are both connected to the hydraulic oil tank 1. The working arm oil cylinder 4 automatically extends or retracts according to the undulation of the working surface to realize the floating function of the working arm. Thus, after the floating function of the working arm is released, the associated redundant actions are cancelled, and the oil cylinder does not automatically retract.

[0041] In the working arm floating system provided by the embodiment of the present invention, a floating control valve 3 is arranged between the oil cylinder control valve 2 and the working arm oil cylinder 4. The floating control valve 3 has two working positions. By switching the floating control valve 3 between the two working positions, the opening and closing of the floating function are realized. After the floating is closed, the oil cylinder control valve 2 is connected to the rod chamber 42 of the working arm oil cylinder 4 and the rodless chamber 41 of the working arm oil cylinder 4 through the floating control valve 3. The working arm oil cylinder 4 is in the normal working mode and can realize the extension or retraction of the oil cylinder. In this way, the opening and closing of the floating function are realized by switching the working positions of the floating control valve 3, thereby avoiding the redundant action of the automatic retraction of the working arm oil cylinder 4 and improving the use safety.

[0042] In an embodiment of the present invention, as Figure 1 shown, the floating system further includes a control module 5. The control module 5 is connected to the floating control valve 3. The control module 5 is used to control the floating control valve 3 to work in the second working position 32 when receiving a floating instruction.

[0043] It can be understood that the control module 5 is electrically connected to the floating control valve 3. The control module 5 is used to control the switching of the floating control valve 3 between the first working position 31 and the second working position 32. For example, when the control module 5 receives a floating instruction, the control module 5 controls the floating control valve 3 to work in the second working position 32 to realize floating opening; when the control module 5 receives a release instruction, the control module 5 controls the floating control valve 3 to work in the first working position 31 to realize floating closing.

[0044] Furthermore, as Figure 1 shown, the floating system further includes a floating control button 7. The floating control button 7 is electrically connected to the control module 5. The floating instruction and the release instruction are sent to the control module 5 through the floating control button 7.

[0045] Specifically, when the floating system is in the initial state (floating closed state or shutdown state), the floating control button 7 is pressed. The floating control button 7 sends a floating instruction to the control module 5. The control module 5 receives the floating instruction and, according to this floating instruction, makes the floating control valve 3 work in the second working position 32 to realize floating opening.

[0046] When it is necessary to release the floating state, press the floating control button 7 again to release the floating control button 7. The floating control button 7 sends a release instruction to the control module 5. The control module 5 receives the release instruction and, according to this release instruction, switches the floating control valve 3 from the second working position 32 to the first working position 31 to achieve floating closure, so that the working arm returns to the normal state, and the lifting or lowering mode can be realized.

[0047] In an embodiment of the present invention, both the oil cylinder control valve 2 and the floating control valve 3 are electrically controlled components and can be hydraulic pilot control elements.

[0048] The oil cylinder control valve 2 has a first control position 21 and a third control position 23; as Figure 3 shown, at the first control position 21, the oil cylinder control valve 2 is connected to the rod chamber 42 of the working arm oil cylinder 4 and the rodless chamber 41 of the working arm oil cylinder 4 through the floating control valve 3, so that the working arm oil cylinder 4 works in the extended state; as Figure 4 shown, at the third control position 23, the oil cylinder control valve 2 is connected to the rod chamber 42 of the working arm oil cylinder 4 and the rodless chamber 41 of the working arm oil cylinder 4 through the floating control valve 3, and the working arm oil cylinder 4 works in the retracted state.

[0049] Exemplarily, as Figure 5 shown, the oil cylinder control valve 2 includes a first connection port C201, a second connection port C202, a third connection port C203, a fourth connection port C204, a fifth connection port C205, a sixth connection port C206, a seventh connection port C207 and an eighth connection port C208.

[0050] When the oil cylinder control valve 2 is at the first control position 21, the first connection port C201 is connected to the oil inlet of the hydraulic oil tank 1, the second connection port C202 is connected to the oil outlet of the hydraulic oil tank 1, the third connection port C203 is connected to the rod chamber 42 of the working arm oil cylinder 4 through the floating control valve 3, the fourth connection port C204 is connected to the rodless chamber 41 of the working arm oil cylinder 4 through the floating control valve 3, the first connection port C201 is communicated with the third connection port C203, and the second connection port C202 and the fourth connection port C204 are communicated with each other. A working pump 8 is provided at the oil outlet of the hydraulic oil tank 1. The oil of the hydraulic oil tank 1 enters the second connection port C202 of the oil cylinder control valve 2 through the working pump 8, flows through the fourth connection port C204 and the floating control valve 3 into the rodless chamber 41 of the working arm oil cylinder 4, the working arm oil cylinder 4 extends, and the oil in the rod chamber 42 of the working arm oil cylinder 4 returns to the hydraulic oil tank 1 through the floating control valve 3, the third connection port C203, the first connection port C201 and the oil inlet of the hydraulic oil tank 1.

[0051] When the oil cylinder control valve 2 is in the second control position 22, the fifth connection port C205 is connected to the oil inlet of the hydraulic oil tank 1, the sixth connection port C206 is connected to the oil outlet of the hydraulic oil tank 1, the seventh connection port C207 is connected to the rod chamber 42 of the working arm oil cylinder 4 through the floating control valve 3, the eighth connection port C208 is connected to the rodless chamber 41 of the working arm oil cylinder 4 through the floating control valve 3, the fifth connection port C205 and the eighth connection port C208 are communicated, and the sixth connection port C206 and the seventh connection port C207 are connected. The oil fluid of the hydraulic oil tank 1 enters the sixth connection port C206 of the oil cylinder control valve 2 through the working pump 8, flows through the seventh connection port C207 and the floating control valve 3 into the rod chamber 42 of the working arm oil cylinder 4, the working arm oil cylinder 4 retracts, and the oil fluid in the rodless chamber 41 of the working arm oil cylinder 4 returns to the hydraulic oil tank 1 through the floating control valve 3, the eighth connection port C208, the fifth connection port C205 and the oil inlet of the hydraulic oil tank 1.

[0052] Further, the oil cylinder control valve 2 further includes a ninth connection port C209, a tenth connection port C210, an eleventh connection port C211 and a twelfth connection port C212. The ninth connection port C209 is connected to the oil inlet of the hydraulic oil tank 1, the tenth connection port C210 is connected to the oil outlet of the hydraulic oil tank 1. When the ninth connection port C209 is cut off, the tenth connection port C210 is cut off, the eleventh connection port C211 is cut off and the twelfth connection port C212 is cut off, the working positions of the oil cylinder control valve 2 further include the second control position 22. At the second control position 22, the oil cylinder control valve 2 and the floating control valve 3 are disconnected, and the working arm oil cylinder 4 does not act.

[0053] Optionally, the second control position 22 is located between the first control position 21 and the third control position 23. It should be noted that when the oil cylinder control valve 2 is at the middle second control position 22, the oil in the hydraulic oil tank 1 flows to other functional associated oil through the bypass circuit.

[0054] In an embodiment of the present utility model, as Figure 1 shown, the control positions of the oil cylinder control valve 2 are actuated by the operating handle 6. The operating handle 6 includes a first position 61, a second position 62 and a third position 63. The first position 61 corresponds to the first control position 21, the second position 62 corresponds to the second control position 22, and the third position 63 corresponds to the third control position 23.

[0055] Among them, the first position 61, the second position 62 and the third position 63 can be arranged in sequence from back to front. It should be noted that the front side is the side farther from the operator, and the back side is the side closer to the operator.

[0056] In an embodiment of the present utility model, the first position 61 has a preset stroke.

[0057] Optionally, the oil cylinder control valve 2 is a solenoid valve V5. Both ends of the spool of the solenoid valve V5 have valve bodies V20 and V21. The valve body V20 is close to the first control position 21, and the valve body V21 is close to the third control position 23. The first position 61 cooperates with the valve body V20. When the operating handle 6 moves backward (to the first position 61) by a certain preset stroke, the greater the stroke, the greater the opening of the valve body V20.

[0058] It can be understood that the third position 63 also has a preset stroke. When the operating handle 6 moves forward by a certain stroke, the greater the stroke, the greater the opening of the valve body V21. It should be noted here that the second position 62 has only one position.

[0059] In an embodiment of the present invention, the control module 5 is connected to the operating handle 6, and the control module 5 is used to monitor the position of the operating handle 6.

[0060] Furthermore, the operating handle 6 is provided with a position measuring element. The position measuring element is connected to the control module 5. The position of the operating handle 6 is monitored through the position measuring element, and the monitored position signal is sent to the control module 5, thereby realizing the monitoring of the position of the operating handle 6. Optionally, the position measuring element can obtain the position of the operating handle 6 through the magnitude of a pressure signal, an electrical signal, or other position signals.

[0061] The working arm floating system provided by the embodiment of the present invention realizes the floating function through the combination of the oil cylinder control valve 2 and the floating control valve 3, and monitors the handle position through the control module 5 to control the opening and closing of the working arm floating function, solving the redundant action of the automatic retraction of the oil cylinder after the traditional floating is released, and having high safety.

[0062] In an embodiment of the present invention, as Figure 6 shown, the floating control valve 3 includes a first connection end C11, a second connection end C12, a third connection end C13, a fourth connection end C14, a fifth connection end C15, a sixth connection end C16, and a seventh connection end C17.

[0063] When the floating control valve 3 is in the first working position 31, the first connection end C11 and the second connection end C12 are respectively connected to two working oil ports of the oil cylinder control valve 2. The third connection end C13 and the fourth connection end C14 are respectively connected to the rod chamber 42 of the working arm oil cylinder 4 and the rodless chamber 41 of the working arm oil cylinder 4. The first connection end C11 and the third connection end C13 are communicated, and the second connection end C12 and the fourth connection end C14 are communicated.

[0064] When the floating control valve 3 is in the second working position 32, the fifth connection end C15 and the sixth connection end C16 are respectively connected to the rod chamber 42 of the working arm oil cylinder 4 and the rodless chamber 41 of the working arm oil cylinder 4. The seventh connection end C17 is connected to the hydraulic oil tank 1, and the fifth connection end C15, the sixth connection end C16, and the seventh connection end C17 are communicated.

[0065] Further, one side of the spool of the floating control valve 3 close to the first working position 31 has a valve body V32, and the valve body V32 can be an electromagnetic valve.

[0066] The floating control valve 3 further includes an eighth connection end C18, a ninth connection end C19, and a tenth connection end C10. When the floating control valve 3 is in the first working position 31, the eighth connection end C18 is connected to the hydraulic oil tank 1, and the eighth connection end C18 is cut off. When the floating control valve 3 is in the second working position 32, the ninth connection end C19 and the tenth connection end are respectively connected to two working oil ports of the oil cylinder control valve 2, and the ninth connection end C19 and the tenth connection end C10 are cut off.

[0067] In a specific embodiment of the present utility model, the working principle of the working arm floating system is provided in this embodiment:

[0068] Floating opening (floating activation)

[0069] The control handle 6 is moved forward to the third position 63, and at the same time, the floating control button 7 is pressed. The control module 5 simultaneously receives the forward input signal of the control handle 6 and the input signal of the floating control button 7 (i.e., the floating command); the control module 5 sends a control signal to the floating control valve 3, the valve body V32 is powered on, and the valve bodies V21 and V20 are not powered on, so that the floating control valve 3 works in the second working position 32 on the right side, and the floating function is turned on.

[0070] It can be understood that in the initial state, the pressure oil from the outlet of the working pump 8 enters the oil cylinder control valve 2 through the IN port, flows through the electromagnetic valve V5 and the working oil port 1A of the oil cylinder control valve 2 into the left first working position 31 of the floating control valve 3 and enters the rod chamber 42 of the working arm oil cylinder 4. The working arm oil cylinder 4 retracts, and the oil in the rodless chamber 41 of the working arm oil cylinder 4 enters the working oil port 1B of the oil cylinder control valve 2 through the left first working position 31 of the floating control valve 3, and returns to the hydraulic oil tank 1 through the oil cylinder control valve 2 through the T port.

[0071] Press the floating control button 7. At this time, the control module 5 receives the floating instruction of the floating control button 7, and the control module 5 outputs power to the valve body V32. The floating control valve 3 enters the second working position 32 on the right side. At this time, the rodless cavity 41 of the working arm cylinder 4 and the rod cavity 42 of the working arm cylinder 4 are connected to the hydraulic oil tank 1 through the second working position 32 on the right side of the floating control valve 3, realizing the floating of the working arm cylinder 4. At this time, the valve body V21 is not powered, and the solenoid valve V5 can be in the middle position (the second position). The pressure oil from the outlet of the working pump 8 enters the second control position 22 of the cylinder control valve 2 through the IN port, and the oil flows through the OUT port to the hydraulic oil tank 1. It should be noted here that in the floating state: the rod cavity 42 of the working arm cylinder 4, the rodless cavity 41 of the working arm cylinder 4 and the hydraulic oil tank 1 are connected. The working arm cylinder 4 automatically extends or retracts according to the undulation of the working surface, and there is no power oil source input to the cylinder. When extending, the oil in the hydraulic oil tank 1 and the oil in the rod cavity 42 flow into the rodless cavity 41 together. When retracting, part of the oil in the rodless cavity 41 flows into the hydraulic oil tank 1, and part of the oil flows into the rod cavity 42.

[0072] It should be noted that if the control handle 6 is in the middle position (the second position 62) and the forward position (the third position 63), the floating function is maintained.

[0073] Floating off (floating release)

[0074] After the floating function is turned on, press the floating control button 7 again to release the floating control button 7, then the floating is released, the valve body V32 is not powered, the valve body V20 is not powered, and the valve body V21 is not powered.

[0075] It can be understood that the pressure oil from the outlet of the working pump 8 enters the second control position 22 of the cylinder control valve 2 through the IN port, and the oil returns to the hydraulic oil tank 1 through the OUT port of the cylinder control valve 2; the rod cavity 42 of the working arm cylinder 4 and the rodless cavity 41 of the working arm cylinder 4 enter the working oil ports 1A and 1B of the cylinder control valve 2 respectively through the first working position 31 on the left of the floating control valve 3, and are connected to the second control position 22 of the cylinder control valve 2.

[0076] Floating off can also be that after the floating function is turned on, the control handle 6 is moved backward to the first position 61, the floating is released, the valve body V32 is not powered, the valve body V20 is powered, and the valve body V21 is not powered.

[0077] It can be understood that the rod chamber 42 of the working arm cylinder 4 and the rodless chamber 41 of the working arm cylinder 4 enter the working oil ports 1A and 1B of the oil cylinder control valve 2 through the first working position 31 of the left position of the floating control valve 3 and communicate with the first control position 21 of the oil cylinder control valve 2. The pressure oil from the outlet of the working pump 8 enters the first control position 21 of the oil cylinder control valve 2 through the IN port. The oil flows into the rodless chamber 41 of the working arm cylinder 4 through the working oil port 1B of the oil cylinder control valve 2 and enters the first control position 21 of the left position of the floating control valve 3. The working arm cylinder 4 extends. The oil in the rod chamber 42 of the working arm cylinder 4 enters the working oil port 1A of the oil cylinder control valve 2 through the first control position 21 of the left position of the floating control valve 3 and returns to the hydraulic oil tank 1 through the first control position 21 of the oil cylinder control valve 2 to the T port.

[0078] It should be noted that after the floating is closed, the working arm control is in the normal mode. If the control handle 6 is in the middle position, there is no action. If the control handle 6 is in the forward position (the third position 63), the working arm descends. If the control handle 6 is in the backward position (the first position 61), the working arm rises.

[0079] An embodiment of the second aspect of the present invention provides a working machine, which includes the working arm floating system provided in any of the above embodiments.

[0080] Exemplarily, in the embodiments of the present invention, the type of the working machine is not limited. 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 working arm floating system in the present invention.

[0081] It can be understood that since the working machine includes the above-mentioned working arm floating system, it necessarily has the various advantages described above.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some 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 invention.

Claims

1. A working arm floating system, characterized in that: include: Hydraulic oil tank; Cylinder control valve; A floating control valve, the working positions of the floating control valve include a first working position and a second working position; in the first working position, the cylinder control valve is connected to the rod chamber of the working arm cylinder and the rodless chamber of the working arm cylinder through the floating control valve; in the second working position, the hydraulic oil tank is connected to the rod chamber of the working arm cylinder and the rodless chamber of the working arm cylinder through the floating control valve.

2. The working arm floating system according to claim 1, characterized in that: The floating control valve includes a first connection end, a second connection end, a third connection end, a fourth connection end, a fifth connection end, a sixth connection end and a seventh connection end; In the first working position, the first connecting end and the second connecting end are respectively connected to the two working oil ports of the cylinder control valve, the third connecting end and the fourth connecting end are respectively connected to the rod chamber of the working arm cylinder and the rodless chamber of the working arm cylinder, the first connecting end is connected to the third connecting end, and the second connecting end is connected to the fourth connecting end; In the second working position, the fifth connecting end and the sixth connecting end are respectively connected to the rod chamber of the working arm cylinder and the rodless chamber of the working arm cylinder, the seventh connecting end is connected to the hydraulic oil tank, and the fifth connecting end, the sixth connecting end and the seventh connecting end are connected.

3. The working arm floating system according to claim 1 or 2, characterized in that: It also includes a control module, which is connected to the floating control valve. The control module is used to control the floating control valve to operate in the second working position when receiving a floating instruction.

4. The working arm floating system according to claim 3, characterized in that: The cylinder control valve has a first control position, a second control position and a third control position. In the first control position, the cylinder control valve is connected to the rod chamber of the working arm cylinder and the rodless chamber of the working arm cylinder through the floating control valve, and the working arm cylinder works in an extended state; In the second control position, the cylinder control valve and the floating control valve are disconnected; In the third control position, the cylinder control valve is connected to the rod chamber of the working arm cylinder and the rodless chamber of the working arm cylinder through the floating control valve, and the working arm cylinder works in a retracted state.

5. The working arm floating system according to claim 4, characterized in that: The control position of the cylinder control valve is operated by a joystick, and the joystick includes a first position, a second position and a third position, the first position corresponds to the first control position, the second position corresponds to the second control position, and the third position corresponds to the third control position.

6. The working arm floating system according to claim 5, characterized in that: The first position and / or the third position has a preset stroke.

7. The working arm floating system according to claim 5, characterized in that: The control module is connected to the joystick, and is used to monitor the position of the joystick.

8. The working arm floating system according to claim 7, characterized in that: The operating handle is provided with a position measuring element, and the position measuring element is connected to the control module.

9. The working arm floating system according to claim 7, characterized in that: Also included is a floating control button connected to the control module.

10. A working machine, characterized in that: Comprising a working arm floating system as claimed in any one of claims 1 to 9.

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