Bulldozer blade float control system and excavator

Abstract

The application discloses a bulldozing blade floating control system and a excavator, wherein the bulldozing blade floating control system comprises an oil supply module, a bulldozing blade oil cylinder, a floating switch module and a reversing control module; an operator switches on or off the oil path conduction between the oil supply module and the bulldozing blade oil cylinder through the floating switch module to open or close the floating function of the bulldozing blade device; and the flow direction of the hydraulic oil to the bulldozing blade oil cylinder is controlled through the reversing control module to control the standby or lifting operation of the bulldozing blade device. The bulldozing blade floating control system can open or close the floating function of the bulldozing blade, has the oil cylinder locking function after the floating function is closed, thereby improving the working condition adaptability and reliability of the excavator, and maintaining the current position of the bulldozing blade oil cylinder through the oil cylinder locking function after the floating function is closed, thereby eliminating the risk of the whole machine falling caused by the misoperation of the operator, and improving the operation safety of the excavator.

Description

Technical Field

[0001] This invention relates to the field of excavator control technology, and in particular to a bulldozer blade floating control system and an excavator. Background Technology

[0002] Currently, to further improve the efficiency of excavators in ground leveling and trenching / backfilling, a floating function for the bulldozer blade has emerged. The floating function of the bulldozer blade means that the blade's hydraulic cylinder can operate independently of the hydraulic system, relying entirely on its own weight to quickly level the ground, adapting in real-time to various complex terrain conditions. The floating function automatically adjusts the blade height to maintain contact with the ground, avoiding frequent adjustments by the operator and thus improving the efficiency of leveling operations.

[0003] In actual operation, when the bulldozer blade is in a floating state, the large and small chambers of the bulldozer blade cylinder are connected to the hydraulic oil tank. At this time, the bulldozer device uses gravity or external force to cause the hydraulic oil in the large and small chambers of the bulldozer blade cylinder to return to the hydraulic oil tank or draw oil from the hydraulic oil tank into the large and small chambers of the bulldozer blade cylinder, thus realizing the floating function of the bulldozer device. When the bulldozer blade is in a non-floating state, the bulldozer blade cylinder may shift its position due to internal leakage in the main valve or pressure relief from the relief valve, making it impossible to lock the position of the bulldozer blade cylinder, resulting in low adaptability and reliability of the excavator as a whole. On the other hand, the floating state of the bulldozer blade is achieved by the operator manually operating the pilot valve to control the switching of the main valve directional valve. Since the switching direction of the floating position of the main valve directional valve oil circuit is currently the same as the switching direction of the lowering position of the bulldozer blade, the operator may accidentally cause the bulldozer blade to suddenly enter the floating position during the lowering of the support, causing the entire machine to suddenly fall, thus creating a safety risk.

[0004] Therefore, improving the adaptability and reliability of excavators under various working conditions, as well as enhancing their operational safety, has become an urgent problem to be solved. Summary of the Invention

[0005] This invention discloses a bulldozer blade floating control system and an excavator, which can simultaneously realize the floating and locking functions of the bulldozer blade, thereby improving the excavator's adaptability and reliability under working conditions, and eliminating the risk of the entire machine falling due to operator error, thus improving the excavator's operational safety.

[0006] To achieve the above objectives, in a first aspect, the present invention discloses a bulldozer blade floating control system, the system comprising: The oil supply module is used to supply hydraulic oil; A bulldozer blade cylinder, wherein the bulldozer blade cylinder is installed in the bulldozer blade device to be controlled; A floating switch module is connected to the oil supply module and the oil circuit of the bulldozer blade cylinder respectively. The floating switch module is used to switch the oil circuit between the oil supply module and the bulldozer blade cylinder to open or close, so as to turn on or off the floating function of the bulldozer blade device. The reversing control module is connected to the oil supply module, the floating switch module and the oil circuit of the bulldozer blade cylinder respectively; The reversing control module is used to control the flow direction of the hydraulic oil to the bulldozer blade cylinder, so as to control the bulldozer blade device to standby or perform lifting operations.

[0007] As an optional implementation, in an embodiment of the first aspect of the present invention, the floating switch module includes: A controller, which generates an on or off signal based on an external switch control signal; A two-way locking unit, which is connected to the oil circuits of the bulldozer blade cylinder and the reversing control module respectively; An electromagnetic switching valve is electrically connected to the controller and is also connected to the oil supply module and the two-way locking unit's oil circuits. The electromagnetic switching valve is used to open the oil circuit between the oil supply module and the two-way locking unit according to the opening signal, directly connecting the dual chambers in the bulldozer blade cylinder to the oil supply module to activate the floating function of the bulldozer blade device. The electromagnetic switching valve is also used to close the oil circuit between the oil supply module and the two-way locking unit according to the closing signal, disconnecting the oil circuit between the dual chambers in the bulldozer blade cylinder and the oil supply module to deactivate the floating function of the bulldozer blade device.

[0008] As an optional implementation, in an embodiment of the first aspect of the present invention, the commutation control module includes: The main valve reversing valve is connected to the oil supply module and the oil circuit of the two-way lock unit respectively; A pilot valve is provided, with its inlet end connected to the oil circuit of the oil supply module, its first outlet end connected to the oil circuit of the first pressure receiving end of the main valve directional valve, and its second outlet end connected to the oil circuit of the second pressure receiving end of the main valve directional valve. The pilot valve is used to switch the oil circuit connection state between its inlet end and its first and second outlet ends according to an external switching touch signal, so as to control the oil pressure on the first and second pressure receiving ends of the main valve directional valve. Specifically, when neither the first nor the second pressure receiving end of the main valve reversing valve receives oil pressure, the main valve reversing valve shuts off the oil passage between the oil supply module and the bidirectional locking unit to keep the bulldozer blade device in standby mode; when the first pressure receiving end of the main valve reversing valve receives oil pressure, the main valve reversing valve opens the oil passage between the oil supply module and the first chamber of the bidirectional locking unit and the bulldozer blade cylinder to control the bulldozer blade device to perform a lifting operation; when the second pressure receiving end of the main valve reversing valve receives oil pressure, the main valve reversing valve opens the oil passage between the oil supply module and the second chamber of the bidirectional locking unit and the bulldozer blade cylinder, and the bulldozer blade device performs a lowering operation.

[0009] As an optional implementation, in an embodiment of the first aspect of the present invention, the bidirectional locking unit includes: A shuttle valve, which is connected to the oil circuits of the solenoid switching valve and the main valve directional valve respectively; A two-way hydraulic lock is connected to the dual chambers of the bulldozer blade cylinder, the main valve reversing valve, and the shuttle valve oil circuit, respectively. The bidirectional hydraulic lock is used to open the oil passage when the pilot control port of the bidirectional hydraulic lock receives hydraulic oil pressure, and to close the oil passage when the pilot control port of the bidirectional hydraulic lock does not receive hydraulic oil pressure.

[0010] As an optional implementation, in an embodiment of the first aspect of the present invention, the commutation control module further includes: A pilot pressure reducing valve is connected to the oil supply module and the oil inlet of the pilot valve. The pilot pressure reducing valve is used to send over-pressurized hydraulic oil back to the oil supply module to reduce the pressure of the hydraulic oil supplied by the oil supply module.

[0011] As an optional implementation, in an embodiment of the first aspect of the present invention, the commutation control module further includes: The main valve compensation valve is connected to the oil supply module and the oil outlet of the main valve reversing valve, respectively. The main valve compensation valve is used to compensate the pressure at the oil outlet of the main valve reversing valve.

[0012] As an optional implementation, in an embodiment of the first aspect of the present invention, the commutation control module further includes: The main valve relief valve is connected to the oil supply module and the main valve directional valve oil circuit respectively. The main valve relief valve is used to send excess hydraulic oil from the oil outlet of the main valve directional valve back to the oil supply module.

[0013] As an optional implementation, in an embodiment of the first aspect of the present invention, the oil supply module includes: A hydraulic oil tank, used to store the hydraulic oil; The main pump is connected to the hydraulic oil tank, the reversing control module, and the floating switch module via oil circuits. The main pump is used to pump the hydraulic oil from the hydraulic oil tank to the reversing control module and the floating switch module.

[0014] As an optional implementation, in an embodiment of the first aspect of the present invention, the oil supply module further includes: The main relief valve is connected to the oil outlet of the main pump and the oil circuit of the hydraulic oil tank. The main relief valve is used to return the excess hydraulic oil discharged by the main pump to the hydraulic oil tank.

[0015] Secondly, the present invention discloses an excavator, characterized in that it comprises: bulldozer blade assembly; The bulldozer blade floating control system as described in the first aspect of the present invention; wherein the bulldozer blade cylinder is disposed in the bulldozer blade device.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The bulldozer blade floating control system provided by this invention switches the oil circuit between the oil supply module and the bulldozer blade cylinder by controlling the floating switch module to open or close the oil circuit, thereby turning on or off the floating function of the bulldozer blade device. The reversing control module controls the flow direction of hydraulic oil to the bulldozer blade cylinder to control the bulldozer blade device to standby or perform lifting operations. After the floating function is turned off, it has a cylinder locking function, thereby improving the excavator's working condition adaptability and reliability. Furthermore, after the floating function is turned off, the cylinder locking function maintains the current position of the bulldozer blade cylinder, eliminating the risk of the entire machine falling due to operator error, thereby improving the excavator's operational safety.

[0017] The excavator provided by this invention adopts the aforementioned bulldozer blade floating control system. By controlling the floating switch module to switch the oil circuit between the oil supply module and the bulldozer blade cylinder to open or close, the floating function of the bulldozer blade device is turned on or off. The reversing control module controls the flow direction of hydraulic oil to the bulldozer blade cylinder to control the bulldozer blade device to standby or perform lifting operations. After the floating function is turned off, it has a cylinder locking function, thereby improving the excavator's adaptability and reliability under working conditions. Furthermore, after the floating function is turned off, the cylinder locking function maintains the current position of the bulldozer blade cylinder, eliminating the risk of the entire machine falling due to operator error, thereby improving the excavator's operational safety. Attached Figure Description

[0018] Figure 1This is a schematic diagram of an example of the bulldozer blade floating control system in this invention; Figure 2 This is a schematic diagram of one embodiment of the bulldozer blade floating control system of the present invention; Figure 3 This is a schematic diagram of another embodiment of the bulldozer blade floating control system of the present invention; Figure 4 This is a schematic diagram of a specific embodiment of the bulldozer blade floating control system of the present invention.

[0019] The meanings of the reference numerals in the attached figures are as follows: Oil supply module 100, hydraulic oil tank 110, main pump 120, main relief valve 130, bulldozer blade cylinder 200, floating switch module 300, controller 310, two-way lock unit 320, shuttle valve 321, two-way hydraulic lock 322, solenoid switching valve 330, reversing control module 400, main valve reversing valve 410, pilot valve 420, pilot pressure reducing valve 430, main valve compensation valve 440, main valve relief valve 450, center rotary joint 500. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0022] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0023] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0024] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0025] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0026] Currently, to further improve the efficiency of excavators in ground leveling and trenching / backfilling, a floating function for the bulldozer blade has emerged. The floating function of the bulldozer blade means that the blade's hydraulic cylinder can operate independently of the hydraulic system, relying entirely on its own weight to quickly level the ground, adapting in real-time to various complex terrain conditions. The floating function automatically adjusts the blade height to maintain contact with the ground, avoiding frequent adjustments by the operator and thus improving the efficiency of leveling operations.

[0027] In actual operation, when the bulldozer blade is in a floating state, the large and small chambers of the bulldozer blade cylinder are connected to the hydraulic oil tank. At this time, the bulldozer device uses gravity or external force to cause the hydraulic oil in the large and small chambers of the bulldozer blade cylinder to return to the hydraulic oil tank or draw oil from the hydraulic oil tank into the large and small chambers of the bulldozer blade cylinder, thus realizing the floating function of the bulldozer device. When the bulldozer blade is in a non-floating state, the bulldozer blade cylinder may shift its position due to internal leakage in the main valve or pressure relief from the relief valve, making it impossible to lock the position of the bulldozer blade cylinder, resulting in low adaptability and reliability of the excavator as a whole. On the other hand, the floating state of the bulldozer blade is achieved by the operator manually operating the pilot valve to control the switching of the main valve directional valve. Since the switching direction of the floating position of the main valve directional valve oil circuit is currently the same as the switching direction of the lowering position of the bulldozer blade, the operator may accidentally cause the bulldozer blade to suddenly enter the floating position during the lowering of the support, causing the entire machine to suddenly fall, thus creating a safety risk.

[0028] Therefore, improving the adaptability and reliability of excavators under various working conditions, as well as enhancing their operational safety, has become an urgent problem to be solved.

[0029] In this regard, embodiments of the present invention provide a bulldozer blade floating control system and an excavator that can simultaneously realize the floating and locking functions of the bulldozer blade, thereby improving the excavator's adaptability and reliability under working conditions, and eliminating the risk of the entire machine falling due to operator error, thus improving the excavator's operational safety.

[0030] like Figure 1 As shown, this invention discloses a bulldozer blade floating control system, which includes: an oil supply module 100, a bulldozer blade cylinder 200, a floating switch module 300, and a reversing control module 400. The oil supply module 100 provides hydraulic oil; the bulldozer blade cylinder 200 is disposed in the bulldozer blade device to be controlled; the floating switch module 300 is connected to the oil supply module 100 and the bulldozer blade cylinder 200 via oil circuits, and is used to switch the oil circuit between the oil supply module 100 and the bulldozer blade cylinder 200 to open or close the floating function of the bulldozer blade device; the reversing control module 400 is connected to the oil supply module 100, the floating switch module 300, and the bulldozer blade cylinder 200 via oil circuits; wherein, the reversing control module 400 controls the flow direction of hydraulic oil to the bulldozer blade cylinder 200 to control the bulldozer blade device to be in standby or performing lifting operations.

[0031] In this embodiment, the bulldozer blade device is a device related to the function of a bulldozer blade in construction machinery such as excavators, including the bulldozer blade body and the bulldozer blade cylinder 200, etc. The oil supply module 100 is connected to the hydraulic circuit of the reversing control module 400 and the floating switch module 300 respectively. The oil supply module 100 stores hydraulic oil and can supply hydraulic oil to the floating switch module 300 and the reversing control module 400.

[0032] When the floating switch module 300 switches the oil circuit between the oil supply module 100 and the bulldozer blade cylinder 200 to the on state, the oil circuit between the bulldozer blade cylinder 200 and the oil supply module 100 is directly connected, thereby enabling the floating function of the bulldozer blade device. When the floating switch module 300 switches the oil circuit between the oil supply module 100 and the bulldozer blade cylinder 200 to the off state, the oil circuit between the bulldozer blade cylinder 200 and the oil supply module 100 is disconnected, and at this time the floating switch module 300 can lock the position of the bulldozer blade cylinder 200, thereby disabling the floating function of the bulldozer blade device.

[0033] The operator can control the flow of hydraulic oil to the bulldozer blade cylinder 200 by controlling the reversing control module 400 to switch the hydraulic circuit channels, thereby enabling the bulldozer blade device to perform standby, lifting, or floating operations. When the floating function is required, the operator can activate it via the floating switch module 300. When performing other operations besides floating, the operator can deactivate the floating function via the floating switch module 300 and control the flow of hydraulic oil via the reversing control module 400 to operate the bulldozer blade device for lifting.

[0034] As can be seen, the bulldozer blade floating control system of the present invention can turn the bulldozer blade floating function on or off through the floating switch module 300. When the floating function is off, it has a cylinder locking function, thereby preventing the bulldozer blade position from shifting due to internal leakage in the main valve or pressure relief in the overflow valve, thus improving the excavator's adaptability and reliability. Simultaneously, even if the operator accidentally operates the reversing control module 400, causing the bulldozer blade to accidentally enter floating mode during the lowering of the support, the aforementioned cylinder locking function maintains the current position of the bulldozer blade cylinder 200, eliminating the risk of the entire machine falling due to operator error, thereby improving the excavator's operational safety.

[0035] like Figure 2 As shown, in an optional embodiment, the floating switch module 300 includes: a controller 310, a bidirectional locking unit 320, and an electromagnetic switching valve 330. The controller 310 is used to generate an open signal or a close signal according to an external switch control signal; the bidirectional locking unit 320 is connected to the hydraulic circuits of the bulldozer blade cylinder 200 and the reversing control module 400, respectively; the electromagnetic switching valve 330 is electrically connected to the controller 310, and is connected to the hydraulic circuits of the oil supply module 100 and the bidirectional locking unit 320, respectively, and the electromagnetic switching valve 330 can respond to the open signal and the close signal of the controller 310. On the one hand, the electromagnetic switching valve 330 is used to open the oil passage between the oil supply module 100 and the two-way locking unit 320 according to the opening signal, so that the double chamber in the bulldozer blade cylinder 200 is directly connected to the oil supply module 100 by oil circuit, thereby activating the floating function of the bulldozer blade device; on the other hand, the electromagnetic switching valve 330 is also used to close the oil passage between the oil supply module 100 and the two-way locking unit 320 according to the closing signal, so that the oil circuit between the double chamber in the bulldozer blade cylinder 200 and the oil supply module 100 is disconnected, thereby deactivating the floating function of the bulldozer blade device.

[0036] In this optional embodiment, the bulldozer blade cylinder 200 and the reversing control module 400 are both connected to the hydraulic circuit of the two-way locking unit 320, the two-way locking unit 320 and the oil supply module 100 are both connected to the hydraulic circuit of the electromagnetic switching valve 330, and the electromagnetic switching valve 330 is electrically connected to the controller 310.

[0037] Operators can provide corresponding switch control signals to control the controller 310 by operating the relevant instruments of excavators and other construction machinery. The controller 310 then generates an open or closed signal based on the corresponding operation. The electromagnetic switching valve 330 can receive signals from the controller 310; for example, the open signal can be an energized signal, and the closed signal can be a de-energized signal. When the electromagnetic switching valve 330 receives an open signal, it switches to the conducting position, connecting the oil passage between the oil supply module 100 and the two-way locking unit 320. At this time, the two-way locking unit 320 is activated by the pressure of the hydraulic oil, meaning that the large and small chambers in the bulldozer blade cylinder 200 are directly connected to the oil supply module 100 via the oil passage, thereby activating the floating function of the bulldozer blade device. When the electromagnetic switching valve 330 receives a closing signal, it switches to the off position, which closes the oil passage between the oil supply module 100 and the two-way locking unit 320. At this time, the two-way locking unit 320 disconnects because it does not receive hydraulic oil pressure, that is, the oil passage between the large and small double chambers in the bulldozer blade cylinder 200 and the oil supply module 100 is disconnected, thereby turning off the floating function of the bulldozer blade device.

[0038] As can be seen, this optional embodiment can also control the switching of the electromagnetic switching valve 330 through the controller 310 to control the switching of the bidirectional locking unit 320, thereby realizing the switching function of the floating function.

[0039] like Figure 3As shown, in an optional embodiment, the reversing control module 400 includes a main reversing valve 410 and a pilot valve 420. The main reversing valve 410 is connected to the oil supply module 100 and the two-way lock unit 320 via oil circuits respectively; the inlet end of the pilot valve 420 is connected to the oil supply module 100 via oil circuit, the first outlet end of the pilot valve 420 is connected to the first pressure receiving end of the main reversing valve 410 via oil circuit, and the second outlet end of the pilot valve 420 is connected to the second pressure receiving end of the main reversing valve 410 via oil circuit. The pilot valve 420 is used to switch the oil circuit conduction state between its inlet end and its first and second outlet ends respectively according to an external switching touch signal, so as to control the oil pressure on the first and second pressure receiving ends of the main reversing valve 410; wherein, when the first pressure receiving end of the main reversing valve 410 is connected to the second pressure receiving end of the main reversing valve 410, the pilot valve 420 controls the oil pressure on the first and second pressure receiving ends of the main reversing valve 410. When neither the first pressure receiving end nor the second pressure receiving end is subjected to oil pressure, the main valve directional valve 410 shuts off the oil passage between the oil supply module 100 and the bidirectional locking unit 320 to control the bulldozer blade device to standby mode; when the first pressure receiving end of the main valve directional valve 410 is subjected to oil pressure, the main valve directional valve 410 opens the oil passage between the oil supply module 100 and the first chamber of the bidirectional locking unit 320 and the bulldozer blade cylinder 200 to control the bulldozer blade device to perform a lifting operation; when the second pressure receiving end of the main valve directional valve 410 is subjected to oil pressure, the main valve directional valve 410 opens the oil passage between the oil supply module 100 and the second chamber of the bidirectional locking unit 320 and the bulldozer blade cylinder 200, and the bulldozer blade device performs a lowering operation.

[0040] In this optional embodiment, refer to Figure 3 and Figure 4 The oil supply module 100 supplies hydraulic oil to the inlet of the pilot valve 420 and the inlet of the main directional valve 410. The outlet of the main directional valve 410 is connected to the oil circuit of the two-way locking unit 320. The first pressure receiving end of the main directional valve 410 is connected to the oil circuit of the first outlet of the pilot valve 420, and the second pressure receiving end of the main directional valve 410 is connected to the oil circuit of the second outlet of the pilot valve 420. The operator can control the conduction state of the two outlets of the pilot valve 420 through operating instruments such as operating levers.

[0041] In the default no-operation state, the oil passage between the inlet p of the pilot valve 420 and the first outlet a and the second outlet b is disconnected, so that the first outlet a of the pilot valve 420 does not provide oil pressure to the first pressure receiving end of the main valve directional valve 410, and the second outlet b of the pilot valve 420 does not provide oil pressure to the second pressure receiving end of the main valve directional valve 410. At this time, the main valve directional valve 410 is in the neutral position, that is, the oil inlet and outlet of the main valve directional valve 410 are closed, the bidirectional locking unit 320 and the bulldozer blade cylinder 200 cannot receive hydraulic oil, and the bulldozer blade device is in standby mode.

[0042] When the operator manipulates the pilot valve 420 to the first oil outlet a, the oil passage between the oil inlet p of the pilot valve 420 and the first oil outlet a is connected, so that the first pressure receiving end of the main valve directional valve 410 can be subjected to the pressure of hydraulic oil, and the main valve directional valve 410 is switched to position I. At this time, the hydraulic oil supplied by the oil supply module 100 can flow through the main valve directional valve 410 to the bidirectional locking unit 320, so that the bidirectional locking unit 320 is opened, so that the first chamber of the bulldozer blade cylinder 200 receives hydraulic oil, thereby controlling the bulldozer blade device to perform lifting operation.

[0043] When the operator manipulates the pilot valve 420 to the second outlet b, the oil passage between the inlet p and the second outlet b of the pilot valve 420 is opened, allowing the second pressure receiving end of the main valve directional valve 410 to receive hydraulic oil pressure, switching the main valve directional valve 410 to position II. At this time, the hydraulic oil supplied by the oil supply module 100 can flow through the main valve directional valve 410 to the bidirectional locking unit 320, opening the bidirectional locking unit 320. This allows the second chamber of the bulldozer blade cylinder 200 to receive hydraulic oil, thereby controlling the bulldozer blade device to perform a lowering operation. The main valve directional valve 410 also has a position III. To control the main valve directional valve 410 to switch to position III, the operator manipulates the pilot valve 420 in the same direction as to position II. Switching to position III requires pushing the pilot valve 420 lever deeper, meaning a higher oil pressure is required at the second pressure receiving end of the main valve directional valve 410.

[0044] Without the floating switch module 300, if the main valve directional valve 410 is accidentally switched to position III, both the large and small chambers of the bulldozer blade cylinder 200 will be directly connected to the oil supply module 100, causing the bulldozer blade device, which should be performing a lowering operation, to switch to floating mode, resulting in the bulldozer blade device suddenly falling. When the floating function of the bulldozer blade device is deactivated by the solenoid switching valve 330 of the floating switch module 300, even if the main valve directional valve 410 is accidentally switched to position III, the bulldozer blade cylinder 200 will maintain its current position under the cylinder locking function of the two-way locking unit 320, preventing the entire machine from suddenly falling and thus improving operational safety.

[0045] As can be seen, this optional embodiment can also control the main valve reversing valve 410 through the pilot valve 420, thereby enabling the bulldozer blade device to be in standby mode, perform lifting operation, or perform lowering operation.

[0046] like Figure 4As shown, in an optional embodiment, the bidirectional locking unit 320 includes: a shuttle valve 321 and a bidirectional hydraulic lock 322. The shuttle valve 321 is connected to the oil circuits of the solenoid switching valve 330 and the main valve directional valve 410, respectively. The bidirectional hydraulic lock 322 is connected to the oil circuits of the dual chamber of the bulldozer cylinder 200, the main valve directional valve 410, and the shuttle valve 321, respectively. The bidirectional hydraulic lock 322 is used to open the oil circuit when the pilot control port of the bidirectional hydraulic lock 322 receives the oil pressure of hydraulic oil, and to close the oil circuit when the pilot control port of the bidirectional hydraulic lock 322 does not receive the oil pressure of hydraulic oil.

[0047] In this optional embodiment, each of the shuttle valves 321 and the bidirectional hydraulic locks 322 is provided in pairs, with each shuttle valve 321 connected to a corresponding bidirectional hydraulic lock 322 oil circuit. One bidirectional hydraulic lock 322 is connected to the large chamber oil circuit of the first cavity of the bulldozer blade cylinder 200, and the other bidirectional hydraulic lock 322 is connected to the small chamber oil circuit of the second cavity of the bulldozer blade cylinder 200. Both shuttle valves 321 are connected to the oil outlet oil circuit of the solenoid switching valve 330, and both bidirectional hydraulic locks 322 are connected to the oil outlet oil circuit of the main valve directional valve 410. One of the shuttle valves 321 is also connected to the oil outlet oil circuit of the main valve directional valve 410.

[0048] The shuttle valve 321 can deliver hydraulic oil supplied by the solenoid switching valve 330 or the main valve directional valve 410 to the bidirectional hydraulic lock 322. The bidirectional hydraulic lock 322 is turned on after receiving hydraulic oil and turned off under the action of the weight of the bulldozer blade when it does not receive hydraulic oil, so that the bulldozer blade cylinder 200 maintains the current position, thereby realizing the function of cylinder locking.

[0049] As can be seen, this optional embodiment can also lock the bulldozer blade cylinder 200 through the bidirectional hydraulic lock 322, and combine it with the switching control of the electromagnetic switching valve 330 to realize the switching function of the floating function.

[0050] like Figure 4 As shown, in an optional embodiment, the reversing control module 400 further includes a pilot pressure reducing valve 430. The pilot pressure reducing valve 430 is connected to the oil inlet of both the oil supply module 100 and the pilot valve 420. The pilot pressure reducing valve 430 is used to return overpressured hydraulic oil to the oil supply module 100 to reduce the pressure of the hydraulic oil supplied by the oil supply module 100.

[0051] In this optional embodiment, the pilot pressure reducing valve 430 is disposed between the oil supply module 100 and the oil inlet end of the pilot valve 420. When the oil pressure of the hydraulic oil supplied by the oil supply module 100 is too high, the pilot pressure reducing valve 430 can reduce the pressure of the hydraulic oil by sending the hydraulic oil back to the oil supply module 100, so as to avoid the oil pressure at the oil inlet end of the pilot valve 420 being too high and to ensure the pressure stability of the control system.

[0052] like Figure 4 As shown, in an optional embodiment, the reversing control module 400 further includes a main valve compensation valve 440. The main valve compensation valve 440 is connected to the oil supply module 100 and the oil outlet of the main valve reversing valve 410, respectively, and is used to compensate the pressure at the oil outlet of the main valve reversing valve 410.

[0053] In this optional embodiment, the main valve compensation valve 440 is disposed between the oil supply module 100 and the oil outlet of the main valve directional valve 410. When the hydraulic oil supplied by the oil supply module 100 has insufficient flow after passing through the main valve directional valve 410, the main valve compensation valve 440 can compensate the pressure of the main valve directional valve 410, maintain the pressure difference across the main valve directional valve 410, and thus ensure the stability of the output flow of the control system.

[0054] like Figure 4 As shown, in an optional embodiment, the reversing control module 400 further includes a main valve relief valve 450. The main valve relief valve 450 is connected to the oil supply module 100 and the main valve reversing valve 410 respectively, and is used to return excess hydraulic oil at the outlet of the main valve reversing valve 410 to the hydraulic oil tank 110.

[0055] In this optional embodiment, the main valve relief valve 450 is disposed between the oil supply module 100 and the oil circuit of the main valve directional valve 410. When the oil pressure of the main valve directional valve 410 is too high, the main valve relief valve 450 can deliver hydraulic oil back to the oil supply module 100, thereby realizing the pressure regulation function of the hydraulic oil at the main valve directional valve 410, thus ensuring the pressure stability of the control system.

[0056] like Figure 4 As shown, in an optional embodiment, the oil supply module 100 includes a hydraulic oil tank 110 and a main pump 120. The hydraulic oil tank 110 is used to store hydraulic oil; the main pump 120 is connected to the hydraulic oil tank 110, the reversing control module 400, and the float switch module 300 via oil circuits, and is used to pump the hydraulic oil in the hydraulic oil tank 110 to the reversing control module 400 and the float switch module 300.

[0057] In this optional embodiment, hydraulic oil is stored in hydraulic oil tank 110, which is connected to the main pump 120 via an oil circuit. The main pump 120 can pump the hydraulic oil in the hydraulic oil tank 110 to the pilot valve 420, the solenoid switching valve 330, and the main valve directional valve 410, respectively.

[0058] like Figure 4As shown, in an optional embodiment, the oil supply module 100 further includes a main relief valve 130. The main relief valve 130 is connected to the oil outlet of the main pump 120 and the oil circuit of the hydraulic oil tank 110, respectively, and is used to return excess hydraulic oil discharged by the main pump 120 to the hydraulic oil tank 110.

[0059] In this optional embodiment, the main relief valve 130 is located between the oil outlet of the main pump 120 and the hydraulic oil tank 110. When the oil pressure pumped out by the main pump 120 is too high, the main relief valve 130 can regulate the pressure of the hydraulic oil by sending the hydraulic oil back to the oil supply module 100, thereby ensuring the pressure stability of the control system.

[0060] In one specific embodiment, a central rotary joint 500 is provided between the bidirectional locking unit 320 and the solenoid switching valve 330 and the main valve directional valve 410, respectively. The central rotary joint 500 enables the front and rear parts of the hydraulic system pipeline to have relative rotary motion without causing interference to the hydraulic passage.

[0061] The present invention also discloses an excavator, which includes a bulldozer blade device and a bulldozer blade floating control system described in the above embodiments of the present invention, wherein the bulldozer blade cylinder 200 is disposed in the bulldozer blade device.

[0062] As can be seen, the excavator in this embodiment adopts the aforementioned bulldozer blade floating control system, which can turn the bulldozer blade floating function on or off via the floating switch module 300. When the floating function is off, it has a cylinder locking function, thereby preventing the bulldozer blade position from shifting due to internal leakage in the main valve or pressure relief in the overflow valve, thus improving the excavator's adaptability and reliability. Furthermore, even if the operator accidentally operates the reversing control module 400, causing the bulldozer blade to accidentally enter floating mode during the lowering of the support, the cylinder locking function maintains the current position of the bulldozer blade cylinder 200, eliminating the risk of the entire machine falling due to operator error and thus improving the excavator's operational safety.

[0063] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. A bulldozer blade floating control system, characterized in that, The system includes: The oil supply module is used to supply hydraulic oil; A bulldozer blade cylinder, wherein the bulldozer blade cylinder is installed in the bulldozer blade device to be controlled; A floating switch module is connected to the oil supply module and the oil circuit of the bulldozer blade cylinder respectively. The floating switch module is used to switch the oil circuit between the oil supply module and the bulldozer blade cylinder to open or close, so as to turn on or off the floating function of the bulldozer blade device. The reversing control module is connected to the oil supply module, the floating switch module and the oil circuit of the bulldozer blade cylinder respectively; The reversing control module is used to control the flow direction of the hydraulic oil to the bulldozer blade cylinder, so as to control the bulldozer blade device to be in standby or to perform lifting operations. The floating switch module includes: A controller, which generates an on or off signal based on an external switch control signal; A two-way locking unit, which is connected to the oil circuits of the bulldozer blade cylinder and the reversing control module respectively; An electromagnetic switching valve is electrically connected to the controller and is also connected to the oil supply module and the two-way locking unit's oil circuits. The electromagnetic switching valve is used to open the oil circuit between the oil supply module and the two-way locking unit according to an opening signal, allowing direct oil circuit connection between the dual chambers in the bulldozer blade cylinder and the oil supply module, thereby activating the floating function of the bulldozer blade device. The electromagnetic switching valve is also used to close the oil circuit between the oil supply module and the two-way locking unit according to a closing signal, disconnecting the oil circuit between the dual chambers in the bulldozer blade cylinder and the oil supply module, thereby deactivating the floating function of the bulldozer blade device. The commutation control module includes: The main valve reversing valve is connected to the oil supply module and the oil circuit of the two-way lock unit respectively; The bidirectional locking unit includes: A shuttle valve, which is connected to the oil circuits of the solenoid switching valve and the main valve directional valve respectively; A two-way hydraulic lock is connected to the dual chambers of the bulldozer blade cylinder, the main valve reversing valve, and the shuttle valve oil circuit, respectively. The bidirectional hydraulic lock is used to open the oil passage when the pilot control port of the bidirectional hydraulic lock receives hydraulic oil pressure, and to close the oil passage when the pilot control port of the bidirectional hydraulic lock does not receive hydraulic oil pressure.

2. The bulldozer blade floating control system according to claim 1, characterized in that, The commutation control module also includes: A pilot valve is provided, with its inlet end connected to the oil circuit of the oil supply module, its first outlet end connected to the oil circuit of the first pressure receiving end of the main valve directional valve, and its second outlet end connected to the oil circuit of the second pressure receiving end of the main valve directional valve. The pilot valve is used to switch the oil circuit connection state between its inlet end and its first and second outlet ends according to an external switching touch signal, so as to control the oil pressure on the first and second pressure receiving ends of the main valve directional valve. Specifically, when neither the first nor the second pressure receiving end of the main valve reversing valve receives oil pressure, the main valve reversing valve shuts off the oil passage between the oil supply module and the bidirectional locking unit to keep the bulldozer blade device in standby mode; when the first pressure receiving end of the main valve reversing valve receives oil pressure, the main valve reversing valve opens the oil passage between the oil supply module and the first chamber of the bidirectional locking unit and the bulldozer blade cylinder to control the bulldozer blade device to perform a lifting operation; when the second pressure receiving end of the main valve reversing valve receives oil pressure, the main valve reversing valve opens the oil passage between the oil supply module and the second chamber of the bidirectional locking unit and the bulldozer blade cylinder, and the bulldozer blade device performs a lowering operation.

3. The bulldozer blade floating control system according to claim 2, characterized in that, The commutation control module also includes: A pilot pressure reducing valve is connected to the oil supply module and the oil inlet of the pilot valve. The pilot pressure reducing valve is used to send over-pressurized hydraulic oil back to the oil supply module to reduce the pressure of the hydraulic oil supplied by the oil supply module.

4. The bulldozer blade floating control system according to claim 2, characterized in that, The commutation control module also includes: The main valve compensation valve is connected to the oil supply module and the oil outlet of the main valve reversing valve, respectively. The main valve compensation valve is used to compensate the pressure at the oil outlet of the main valve reversing valve.

5. The bulldozer blade floating control system according to claim 4, characterized in that, The commutation control module also includes: The main valve relief valve is connected to the oil supply module and the main valve directional valve oil circuit respectively. The main valve relief valve is used to send excess hydraulic oil from the oil outlet of the main valve directional valve back to the oil supply module.

6. The bulldozer blade floating control system according to any one of claims 1 to 5, characterized in that, The oil supply module includes: A hydraulic oil tank, used to store the hydraulic oil; The main pump is connected to the hydraulic oil tank, the reversing control module, and the floating switch module via oil circuits. The main pump is used to pump the hydraulic oil from the hydraulic oil tank to the reversing control module and the floating switch module.

7. The bulldozer blade floating control system according to claim 6, characterized in that, The oil supply module also includes: The main relief valve is connected to the oil outlet of the main pump and the oil circuit of the hydraulic oil tank. The main relief valve is used to return the excess hydraulic oil discharged by the main pump to the hydraulic oil tank.

8. An excavator, characterized in that, The excavator includes: bulldozer blade assembly; The bulldozer blade floating control system as described in any one of claims 1 to 7; wherein the bulldozer blade cylinder is disposed in the bulldozer blade device.

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