Bulldozing blade floating control system and excavator

Abstract

The invention discloses a dozer blade floating control system and an excavator, the dozer blade floating control system comprises an oil supply module, a dozer blade oil cylinder, a floating switch module and a reversing control module, an operator controls the floating switch module to switch on or off an oil way between the oil supply module and the dozer blade oil cylinder; and the reversing control module is used for controlling the flow direction of the hydraulic oil to the dozer blade oil cylinder so as to control the dozer blade device to be in a standby state or execute lifting operation. According to the bulldozing blade floating control system, the floating function of the bulldozing blade can be started or stopped, the oil cylinder locking function is achieved after the floating function is stopped, so that the working condition adaptability and reliability of an excavator are improved, the current position of the oil cylinder of the bulldozing blade is maintained through the oil cylinder locking function after the floating function is stopped, and the working condition adaptability of the excavator is improved. And the risk that the whole excavator falls off due to misoperation of operators is eliminated, so that the operation safety of the excavator is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of excavator control, in particular to a bulldozing blade floating control system and an excavator. BACKGROUND

[0002] At present, in order to further improve the operation efficiency of ground leveling and ditch backfilling of the excavator, the bulldozing blade floating function emerges as the times require. The floating function of the bulldozing blade refers to that the bulldozing blade cylinder can not be controlled by the hydraulic system, and can realize rapid bulldozing leveling by relying on its own weight, and can adapt to various complex terrain leveling conditions in real time. The floating function of the bulldozing blade can automatically adjust the height to keep the blade in contact with the ground, so as to avoid frequent adjustment of the bulldozing blade by the operator, and thus improve the efficiency of leveling operation.

[0003] In actual operation, when the bulldozing blade is in the floating state, the large and small cavities in the bulldozing blade cylinder are communicated with the hydraulic oil tank. At this time, the bulldozing device promotes the hydraulic oil in the large and small cavities of the bulldozing blade cylinder to return to the hydraulic oil tank or to be sucked from the hydraulic oil tank to the large and small cavities of the bulldozing blade cylinder by gravity or external force, and thus realizes the floating function of the bulldozing device. When the bulldozing blade is in the non-floating state, the position of the bulldozing blade is deviated due to reasons such as main valve internal leakage or relief valve pressure relief, so that the position of the bulldozing blade cylinder cannot be locked, and the adaptability and reliability of the whole excavator are low. On the other hand, the floating state of the bulldozing blade is realized by manually operating the hand pilot valve to control the main valve reversing valve to reverse. Since the floating position reversing direction of the main valve reversing valve oil path is consistent with the reversing direction of the bulldozing blade descending position, the operator may suddenly enter the floating position in the process of descending the bulldozing blade due to misoperation, which causes the whole machine to suddenly fall, thereby causing safety risk.

[0004] Therefore, how to improve the adaptability and reliability of the excavator, and improve the operation safety of the excavator, has become a problem to be solved. SUMMARY

[0005] The present application discloses a bulldozing blade floating control system and an excavator, which can realize the floating function and locking function of the bulldozing blade at the same time, thereby improving the adaptability and reliability of the excavator, and eliminating the risk of the whole machine falling caused by the misoperation of the operator, thereby improving the operation safety of the excavator.

[0006] In order to achieve the above-mentioned purpose, in a first aspect, the present application discloses a bulldozing blade floating control system, which comprises: an oil supply module, the oil supply module being used for providing hydraulic oil; a bulldozing blade cylinder, the bulldozing blade cylinder being arranged in a bulldozing blade device to be controlled; A floating switch module connected with the oil supply module and the oil cylinder oil circuit of the dozing blade respectively, and used for switching on or off the oil circuit between the oil supply module and the oil cylinder of the dozing blade to turn on or off the floating function of the dozing blade device; A reversing control module connected with the oil supply module, the floating switch module and the oil cylinder oil circuit of the dozing blade respectively; The reversing control module is used for controlling the flow direction of the hydraulic oil to the oil cylinder of the dozing blade to control standby or lifting operation of the dozing blade device.

[0007] As an optional embodiment, in the embodiment of the first aspect of the present application, the floating switch module comprises: A controller used for generating an on signal or an off signal according to an external switch control signal; A bidirectional lock unit connected with the oil cylinder of the dozing blade and the reversing control module respectively; An electromagnetic switch valve electrically connected with the controller, connected with the oil supply module and the bidirectional lock unit respectively, and used for opening the oil circuit passage between the oil supply module and the bidirectional lock unit according to the on signal to make the double cavities in the oil cylinder of the dozing blade directly connected with the oil supply module to turn on the floating function of the dozing blade device, and used for closing the oil circuit passage between the oil supply module and the bidirectional lock unit according to the off signal to disconnect the oil circuit between the double cavities in the oil cylinder of the dozing blade and the oil supply module to turn off the floating function of the dozing blade device.

[0008] As an optional embodiment, in the embodiment of the first aspect of the present application, the reversing control module comprises: A main valve reversing valve connected with the oil supply module and the bidirectional lock unit respectively; A pilot valve, whose inlet end is connected with the oil supply module, whose first outlet end is connected with the first pressure receiving end of the main valve reversing valve, and whose second outlet end is connected with the second pressure receiving end of the main valve reversing valve, and used for switching the oil circuit passage between the inlet end and the first outlet end and the second outlet end according to an external switch control signal to control the oil pressure of the first pressure receiving end and the second pressure receiving end of the main valve reversing valve; When neither the first pressure receiving end nor the second pressure receiving end of the main valve reversing valve receives oil pressure, the main valve reversing valve closes the oil passage between the oil supply module and the bidirectional lock unit to control the bulldozer device to standby; when the first pressure receiving end of the main valve reversing valve receives oil pressure, the main valve reversing valve opens the oil passage of the oil supply module to the bidirectional lock unit and the first cavity of the bulldozer oil cylinder to control the bulldozer device to perform 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 of the oil supply module to the bidirectional lock unit and the second cavity of the bulldozer oil cylinder, and the bulldozer device performs lowering operation.

[0009] As an optional implementation, in the embodiment of the first aspect of the present application, the bidirectional lock unit comprises: a shuttle valve connected with the electromagnetic switching valve and the main valve reversing valve respectively; a bidirectional hydraulic lock connected with the double cavities of the bulldozer oil cylinder, the main valve reversing valve and the shuttle valve respectively; The bidirectional hydraulic lock is used to open the oil passage when the pilot control oil port of the bidirectional hydraulic lock receives oil pressure of hydraulic oil, and close the oil passage when the pilot control oil port of the bidirectional hydraulic lock does not receive oil pressure of hydraulic oil.

[0010] As an optional implementation, in the embodiment of the first aspect of the present application, the reversing control module further comprises: a pilot pressure reducing valve connected with the oil supply module and the oil inlet end of the pilot valve respectively, the pilot pressure reducing valve is used to deliver the overpressure hydraulic oil back to the oil supply module to reduce the pressure of the hydraulic oil provided by the oil supply module.

[0011] As an optional implementation, in the embodiment of the first aspect of the present application, the reversing control module further comprises: a main valve compensation valve connected with the oil supply module and the oil outlet end of the main valve reversing valve respectively, the main valve compensation valve is used to compensate the pressure of the oil outlet end of the main valve reversing valve.

[0012] As an optional implementation, in the embodiment of the first aspect of the present application, the reversing control module further comprises: a main valve overflow valve connected with the oil supply module and the main valve reversing valve respectively, the main valve overflow valve is used to deliver the excess hydraulic oil at the oil outlet end of the main valve reversing valve back to the oil supply module.

[0013] As an optional implementation, in the embodiment of the first aspect of the present application, the oil supply module comprises: a hydraulic oil tank for storing the hydraulic oil; a main pump connected with the hydraulic oil tank, the reversing control module and the float switch module respectively, and used for pumping the hydraulic oil in the hydraulic oil tank to the reversing control module and the float switch module.

[0014] As an optional implementation, in the embodiment of the first aspect of the present application, the oil supply module further comprises: a total overflow valve connected with the oil outlet of the main pump and the hydraulic oil tank respectively, and used for delivering the excess hydraulic oil discharged by the main pump back to the hydraulic oil tank.

[0015] In a second aspect, the present application discloses a backhoe, characterized in that comprising: a backhoe shovel device; the backhoe shovel float control system according to the first aspect of the present application; wherein the backhoe shovel oil cylinder is arranged in the backhoe shovel device.

[0016] Compared with the prior art, the present application has the following advantages: The backhoe shovel float control system provided by the present application opens or closes the float function of the backhoe shovel device by controlling the float switch module to switch the oil path conduction or shutdown between the oil supply module and the backhoe shovel oil cylinder, and controls the backhoe shovel device to standby or perform lifting operation by controlling the flow direction of the hydraulic oil to the backhoe shovel oil cylinder through the reversing control module, so as to improve the working condition adaptability and reliability of the excavator, and maintain the current position of the backhoe shovel oil cylinder through the oil cylinder locking function after the float 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.

[0017] The backhoe provided by the present application adopts the above-mentioned backhoe shovel float control system, opens or closes the float function of the backhoe shovel device by controlling the float switch module to switch the oil path conduction or shutdown between the oil supply module and the backhoe shovel oil cylinder, and controls the backhoe shovel device to standby or perform lifting operation by controlling the flow direction of the hydraulic oil to the backhoe shovel oil cylinder through the reversing control module, so as to improve the working condition adaptability and reliability of the excavator, and maintain the current position of the backhoe shovel oil cylinder through the oil cylinder locking function after the float 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. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1Structure diagram of an embodiment of the bulldozer blade floating control system in the application; Figure 2 Structure diagram of an embodiment of the bulldozer blade floating control system in the application; Figure 3 Structure diagram of another embodiment of the bulldozer blade floating control system in the application; Figure 4 Structure diagram of a specific embodiment of the bulldozer blade floating control system in the application.

[0019] In the drawings, the reference signs have the following meanings: Oil supply module 100, hydraulic oil tank 110, main pump 120, total overflow valve 130, bulldozer blade cylinder 200, floating switch module 300, controller 310, bidirectional lock unit 320, shuttle valve 321, bidirectional hydraulic lock 322, electromagnetic switching valve 330, reversing control module 400, main valve reversing valve 410, pilot valve 420, pilot pressure reducing valve 430, main valve compensating valve 440, main valve overflow valve 450, center swivel joint 500. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0021] In the application, the terms “upper”, “lower”, “left”, “right”, “front”, “back”, “top”, “bottom”, “inner”, “outer”, “middle”, “vertical”, “horizontal”, “transverse”, “longitudinal” and the like indicate the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0022] In addition, in addition to indicating the orientation or positional relationship, some of the above terms can also be used to indicate other meanings, for example, the term “upper” can also be used to indicate a certain dependent relationship or connection relationship in some cases. For a person of ordinary skill in the art, the specific meaning of these terms in the application can be understood according to the specific situation.

[0023] Moreover, the terms "mount", "set", "provided with", "connect", "connected" should be broadly understood. For example, it can be fixed connection, detachable connection, or integral structure; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] In addition, the terms "first", "second" and the like are mainly used to distinguish different devices, elements or components (the specific type and structure may be the same or different), and are not intended to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "multiple" is two or more.

[0025] The technical solutions of the present application will be further described below in conjunction with the embodiments and drawings.

[0026] At present, in order to further improve the operation efficiency of excavator ground leveling and ditch backfilling, the bulldozing blade floating function emerges as the times require. The floating function of the bulldozing blade refers to the fact that the bulldozing blade cylinder can be controlled without hydraulic system, and can realize rapid bulldozing leveling by relying on its own weight, and can adapt to various complex terrain leveling conditions in real time. The floating function of the bulldozing blade can automatically adjust the height to keep the blade in contact with the ground, avoiding frequent adjustment of the bulldozing blade by the operator, and thus improving the efficiency of leveling operation.

[0027] In actual operation, when the bulldozing blade is in floating state, the large and small cavities in the bulldozing blade cylinder will be communicated with the hydraulic oil tank. At this time, the bulldozing device promotes the hydraulic oil in the large and small cavities of the bulldozing blade cylinder to return to the hydraulic oil tank or to be sucked from the hydraulic oil tank to the large and small cavities of the bulldozing blade cylinder by gravity or external force, thereby realizing the floating function of the bulldozing device. When the bulldozing blade is in non-floating state, the position of the bulldozing blade will be deviated due to reasons such as main valve internal leakage or relief valve pressure relief, so that the position of the bulldozing blade cylinder cannot be locked, resulting in low adaptability and reliability of the whole excavator. On the other hand, the floating state of the bulldozing blade is realized by the operator manually operating the hand pilot valve to control the main valve reversing valve to reverse. Since the floating position reversing direction of the main valve reversing valve oil way is consistent with the reversing direction of the bulldozing blade descending position, the operator may suddenly enter the floating position during the process of lowering the bulldozing blade due to misoperation, resulting in sudden falling of the whole machine, thereby causing safety risk.

[0028] Therefore, how to improve the adaptability and reliability of the excavator, and improve the operation safety of the excavator, has become a problem to be solved.

[0029] To this end, the embodiment of the present application provides a bulldozing blade floating control system and a excavator, which can realize the floating function and locking function of the bulldozing blade at the same time, thereby improving the working condition adaptability and reliability of the excavator, and eliminating the risk of the whole machine falling caused by the misoperation of the operator, thereby improving the operation safety of the excavator.

[0030] As shown in Figure 1 The present application discloses a bulldozing blade floating control system, which comprises an oil supply module 100, a bulldozing blade oil cylinder 200, a floating switch module 300 and a reversing control module 400. The oil supply module 100 is used to supply hydraulic oil; the bulldozing blade oil cylinder 200 is arranged in the bulldozing blade device to be controlled; the floating switch module 300 is connected with the oil circuit of the oil supply module 100 and the bulldozing blade oil cylinder 200 respectively, and is used to switch on or off the oil circuit between the oil supply module 100 and the bulldozing blade oil cylinder 200, so as to open or close the floating function of the bulldozing blade device; the reversing control module 400 is connected with the oil circuit of the oil supply module 100, the floating switch module 300 and the bulldozing blade oil cylinder 200 respectively; wherein the reversing control module 400 is used to control the flow direction of the hydraulic oil to the bulldozing blade oil cylinder 200, so as to control the standby or lifting operation of the bulldozing blade device.

[0031] In the embodiment, the bulldozing blade device is a device related to the bulldozing blade function in the engineering machinery such as the excavator, which comprises a bulldozing blade body and a bulldozing blade oil cylinder 200 and the like. The oil supply module 100 is connected with the oil circuit of the reversing control module 400 and the floating switch module 300 respectively, and 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 bulldozing blade oil cylinder 200 to be in the on state, the oil circuit between the bulldozing blade oil cylinder 200 and the oil supply module 100 is directly communicated, so as to open the floating function of the bulldozing blade device. When the floating switch module 300 switches the oil circuit between the oil supply module 100 and the bulldozing blade oil cylinder 200 to be in the off state, the oil circuit between the bulldozing blade oil 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 bulldozing blade oil cylinder 200, so as to close the floating function of the bulldozing blade device.

[0033] The operator can control the flow direction of the hydraulic oil to the dozer blade oil cylinder 200 by the reversing control module 400 to realize standby, lifting operation or floating operation of the dozer blade device. When the floating function is needed, the operator can turn on the floating function through the floating switch module 300. When the floating function is needed in addition to the floating function, the operator can turn off the floating function through the floating switch module 300 and control the dozer blade device to perform lifting operation by controlling the flow direction of the hydraulic oil through the reversing control module 400.

[0034] It can be seen that the dozer blade floating control system can turn on or off the floating function of the dozer blade through the floating switch module 300, and has the oil cylinder locking function after the floating function is turned off, so as to avoid the problem that the dozer blade position deviates due to the main valve leakage or the relief valve pressure relief of the dozer blade oil cylinder 200, thereby improving the working condition adaptability and reliability of the excavator. At the same time, after the floating function is turned off, even if the operator misoperates the reversing control module 400 to make the dozer blade accidentally enter the floating mode during the lowering process, the current position of the dozer blade oil cylinder 200 is maintained through the above-mentioned oil cylinder locking function, thereby eliminating the risk of the whole machine falling caused by the operator's misoperation, and improving the operation safety of the excavator.

[0035] As shown in Figure 2 In an optional embodiment, the floating switch module 300 includes a controller 310, a bidirectional lock unit 320 and an electromagnetic switch valve 330. The controller 310 is used to generate an opening signal or a closing signal according to an external switch control signal; the bidirectional lock unit 320 is connected with the dozer blade oil cylinder 200 and the reversing control module 400 respectively; the electromagnetic switch valve 330 is connected with the controller 310, and the electromagnetic switch valve 330 is connected with the oil supply module 100 and the bidirectional lock unit 320 respectively, and the electromagnetic switch valve 330 can respond to the opening signal and the closing signal of the controller 310. On the one hand, the electromagnetic switch valve 330 is used to open the oil path channel between the oil supply module 100 and the bidirectional lock unit 320 according to the opening signal, so that the double cavities in the dozer blade oil cylinder 200 are directly connected with the oil supply module 100 in oil path, to turn on the floating function of the dozer blade device; on the other hand, the electromagnetic switch valve 330 is also used to close the oil path channel between the oil supply module 100 and the bidirectional lock unit 320 according to the closing signal, so that the oil path between the double cavities in the dozer blade oil cylinder 200 and the oil supply module 100 is disconnected, to turn off the floating function of the dozer blade device.

[0036] In this optional embodiment, the dozer blade oil cylinder 200 and the reversing control module 400 are connected with the bidirectional lock unit 320 in oil path, the bidirectional lock unit 320 and the oil supply module 100 are connected with the electromagnetic switch valve 330 in oil path, and the electromagnetic switch valve 330 is connected with the controller 310 in electricity.

[0037] The operator can provide corresponding switch control signals to the controller 310 by operating the relevant instruments of the engineering machinery such as the excavator, so that the controller 310 generates an opening signal or a closing signal according to the corresponding operation. The electromagnetic switch valve 330 can receive the signal from the controller 310, for example, the opening signal can be a power-on signal, and the closing signal can be a power-off signal. When the electromagnetic switch valve 330 receives the opening signal, it switches to the conduction position, so that the oil path between the oil supply module 100 and the bidirectional lock unit 320 is turned on. At this time, the bidirectional lock unit 320 is turned on due to receiving the pressure of the hydraulic oil, that is, the large and small cavities in the dozer blade oil cylinder 200 are directly connected with the oil path of the oil supply module 100, so as to open the floating function of the dozer blade device. When the electromagnetic switch valve 330 receives the closing signal, it switches to the off position, so that the oil path between the oil supply module 100 and the bidirectional lock unit 320 is turned off. At this time, the bidirectional lock unit 320 is turned off due to not receiving the pressure of the hydraulic oil, that is, the oil path between the large and small cavities in the dozer blade oil cylinder 200 and the oil supply module 100 is disconnected, so as to close the floating function of the dozer blade device.

[0038] It can be seen that the optional embodiment can also control the opening and closing of the bidirectional lock unit 320 by controlling the electromagnetic switch valve 330 through the controller 310, so as to realize the opening and closing of the floating function.

[0039] As Figure 3As shown, in an optional embodiment, the reversing control module 400 comprises a main valve reversing valve 410 and a pilot valve 420. The main valve reversing valve 410 is connected to the oil supply module 100 and the bidirectional lock unit 320 respectively; the oil inlet of the pilot valve 420 is connected to the oil supply module 100, the first oil outlet of the pilot valve 420 is connected to the first pressure receiving end of the main valve reversing valve 410, and the second oil outlet of the pilot valve 420 is connected to the second pressure receiving end of the main valve reversing valve 410. The pilot valve 420 is used to switch the oil circuit conduction state between the oil inlet and the first and second oil outlets respectively according to the external switching touch signal, so as to control the oil pressure of the first and second pressure receiving ends of the main valve reversing valve 410. When the first and second pressure receiving ends of the main valve reversing valve 410 are not subjected to oil pressure, the main valve reversing valve 410 closes the oil circuit channel between the oil supply module 100 and the bidirectional lock unit 320, so as to control the bulldozer blade device to standby. When the first pressure receiving end of the main valve reversing valve 410 is subjected to oil pressure, the main valve reversing valve 410 opens the oil circuit channel of the oil supply module 100 to the first cavity of the bidirectional lock unit 320 and the bulldozer blade cylinder 200, so as to control the bulldozer blade device to perform lifting operation. When the second pressure receiving end of the main valve reversing valve 410 is subjected to oil pressure, the main valve reversing valve 410 opens the oil circuit channel of the oil supply module 100 to the second cavity of the bidirectional lock unit 320 and the bulldozer blade cylinder 200, so as to control the bulldozer blade device to perform lowering operation.

[0040] In this optional embodiment, referring to Figure 3 and Figure 4 , the oil supply module 100 provides hydraulic oil for the oil inlet of the pilot valve 420 and the oil inlet of the main valve reversing valve 410 respectively, the oil outlet of the main valve reversing valve 410 is connected to the bidirectional lock unit 320, the first pressure receiving end of the main valve reversing valve 410 is connected to the first oil outlet of the pilot valve 420, and the second pressure receiving end of the main valve reversing valve 410 is connected to the second oil outlet of the pilot valve 420. The operator can control the conduction state of the oil inlet of the pilot valve 420 to the two oil outlets by operating the operating rod and other operating instruments.

[0041] In the default no-operation state, the oil circuit channel between the oil inlet p and the first and second oil outlets a and b of the pilot valve 420 is disconnected, so that the first oil outlet a of the pilot valve 420 provides no oil pressure to the first pressure receiving end of the main valve reversing valve 410, and the second oil outlet b of the pilot valve 420 provides no oil pressure to the second pressure receiving end of the main valve reversing valve 410. At this time, the main valve reversing valve 410 is in the middle position, that is, the oil inlet and the oil outlet of the main valve reversing valve 410 are closed, the bidirectional lock unit 320 and the bulldozer blade cylinder 200 cannot receive hydraulic oil, and the bulldozer blade device is in standby state.

[0042] When the operator manipulates the pilot valve 420 to the first oil outlet end a, the oil passage between the inlet end p and the first oil outlet end a of the pilot valve 420 is connected, so that the first pressure receiving end of the main valve reversing valve 410 can be subjected to the pressure of the hydraulic oil, and the main valve reversing valve 410 is reversed to position I. At this time, the hydraulic oil provided by the oil supply module 100 can flow to the bidirectional lock unit 320 through the main valve reversing valve 410, so that the bidirectional lock unit 320 is opened, and thus the first large cavity of the bulldozer blade oil cylinder 200 receives the hydraulic oil, so as to control the bulldozer blade device to perform the lifting operation.

[0043] When the operator manipulates the pilot valve 420 to the second oil outlet end b, the oil passage between the inlet end p and the second oil outlet end b of the pilot valve 420 is connected, so that the second pressure receiving end of the main valve reversing valve 410 can be subjected to the pressure of the hydraulic oil, and the main valve reversing valve 410 is reversed to position II. At this time, the hydraulic oil provided by the oil supply module 100 can flow to the bidirectional lock unit 320 through the main valve reversing valve 410, so that the bidirectional lock unit 320 is opened, and thus the second small cavity of the bulldozer blade oil cylinder 200 receives the hydraulic oil, so as to control the bulldozer blade device to perform the lowering operation. The main valve reversing valve 410 also has position III. The direction of the operator manipulating the pilot valve 420 to control the main valve reversing valve 410 to be reversed to position III is consistent with the direction of being reversed to position II. The depth of the operating rod of the pilot valve 420 required to reverse the main valve reversing valve 410 to position III is deeper, that is, the oil pressure required by the second pressure receiving end of the main valve reversing valve 410 is greater.

[0044] When the floating switch module 300 is not arranged, if the main valve reversing valve 410 is reversed to position III due to misoperation, the large and small cavities of the bulldozer blade oil cylinder 200 are directly connected with the oil passage of the oil supply module 100, so that the bulldozer blade device which should perform the lowering operation is mistakenly switched to the floating mode, and the bulldozer blade device suddenly falls. After the electromagnetic switching valve 330 of the floating switch module 300 is closed to close the floating function of the bulldozer blade device, even if the main valve reversing valve 410 is reversed to position III due to misoperation, the bulldozer blade oil cylinder 200 will maintain the current position under the action of the oil cylinder locking function of the bidirectional lock unit 320, so as to avoid the sudden falling of the whole machine, thereby improving the operation safety.

[0045] It can be seen that the optional embodiment can also control the main valve reversing valve 410 through the pilot valve 420, so as to realize the standby, lifting operation or lowering operation of the bulldozer blade device.

[0046] As Figure 4As shown, in an optional embodiment, the two-way lock unit 320 includes: a shuttle valve 321 and a two-way hydraulic lock 322, the shuttle valve 321 is respectively connected to the oil circuits of the electromagnetic switching valve 330 and the main valve reversing valve 410; the two-way hydraulic lock 322 is respectively connected to the double chambers of the bulldozer cylinder 200, the main valve reversing valve 410 and the shuttle valve 321; wherein the two-way hydraulic lock 322 is used to open the oil circuit when the pilot control oil port of the two-way hydraulic lock 322 receives the oil pressure of the hydraulic oil, and to close the oil circuit when the pilot control oil port of the two-way hydraulic lock 322 does not receive the oil pressure of the hydraulic oil.

[0047] In this alternative embodiment, a pair of shuttle valves 321 and two-way hydraulic locks 322 are provided, each of which is connected to the oil circuit of a corresponding two-way hydraulic lock 322. One of the two-way hydraulic locks 322 is connected to the oil circuit of the first, large chamber of the bulldozer cylinder 200, while the other two-way hydraulic lock 322 is connected to the oil circuit of the second, small chamber of the bulldozer cylinder 200. Both shuttle valves 321 are connected to the oil outlet of the solenoid switching valve 330. Both two-way hydraulic locks 322 are connected to the oil outlet of the main valve reversing valve 410, with one of the shuttle valves 321 also connected to the oil outlet of the main valve reversing valve 410.

[0048] The shuttle valve 321 can deliver the hydraulic oil provided by the electromagnetic switching valve 330 or the main valve reversing valve 410 to the two-way hydraulic lock 322. The two-way hydraulic lock 322 is turned on after receiving the hydraulic oil, and is turned off under the action of the bulldozer's gravity when it does not receive the hydraulic oil, so that the bulldozer cylinder 200 maintains the current position, thereby realizing the cylinder locking function.

[0049] It can be seen that this optional embodiment can also lock the bulldozer cylinder 200 through the two-way hydraulic lock 322, combined with the switching control of the above-mentioned electromagnetic switching valve 330, to achieve the switching effect 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 supply module 100 and the oil inlet end oil circuit of the pilot valve 420 respectively. The pilot pressure reducing valve 430 is used to transport over-pressure hydraulic oil back to the oil supply module 100 to reduce the pressure of the hydraulic oil provided by the oil supply module 100.

[0051] In this optional embodiment, the pilot pressure reducing valve 430 is arranged between the oil supply module 100 and the oil circuit of the oil inlet end of the pilot valve 420. When the oil pressure of the hydraulic oil provided by the oil supply module 100 is too high, the pilot pressure reducing valve 430 can realize the pressure reducing function of the hydraulic oil by transporting 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, thereby ensuring the pressure stability of the control system.

[0052] As shown in FIG. 4, in one optional embodiment, the reversing control module 400 further comprises a main valve compensation valve 440. The main valve compensation valve 440 is connected to the oil outlet of the main valve reversing valve 410 and the oil supply module 100, respectively. The main valve compensation valve 440 is used to compensate the pressure of the oil outlet of the main valve reversing valve 410. Figure 4 In this optional embodiment, the main valve compensation valve 440 is arranged between the oil supply module 100 and the oil outlet of the main valve reversing valve 410. When the flow of the hydraulic oil provided by the oil supply module 100 is insufficient after passing through the main valve reversing valve 410, the main valve compensation valve 440 can compensate the pressure of the main valve reversing valve 410, so as to maintain the pressure difference between the front and back of the main valve reversing valve 410 stable, thereby ensuring the stability of the output flow of the control system.

[0053] As shown in FIG. 4, in one optional embodiment, the reversing control module 400 further comprises a main valve overflow valve 450. The main valve overflow valve 450 is connected to the oil outlet of the main valve reversing valve 410 and the oil supply module 100, respectively. The main valve overflow valve 450 is used to deliver the excess hydraulic oil at the oil outlet of the main valve reversing valve 410 back to the hydraulic oil tank 110.

[0054] Figure 4 In this optional embodiment, the main valve overflow valve 450 is arranged between the oil supply module 100 and the oil outlet of the main valve reversing valve 410. When the oil pressure of the main valve reversing valve 410 is too high, the main valve overflow valve 450 can deliver the hydraulic oil back to the oil supply module 100, thereby realizing the pressure regulating function of the hydraulic oil at the main valve reversing valve 410, so as to ensure the pressure stability of the control system.

[0055] As shown in FIG. 4, in one optional embodiment, the oil supply module 100 comprises 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 floating switch module 300, respectively. The main pump 120 is used to pump the hydraulic oil in the hydraulic oil tank 110 to the reversing control module 400 and the floating switch module 300.

[0056] In this optional embodiment, the hydraulic oil is stored in the hydraulic oil tank 110. The hydraulic oil tank 110 is connected to the main pump 120. The main pump 120 can pump the hydraulic oil in the hydraulic oil tank 110 to the pilot valve 420, the electromagnetic switching valve 330 and the main valve reversing valve 410, respectively. Figure 4 As shown in FIG. 4, in one optional embodiment, the oil supply module 100 comprises 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 floating switch module 300, respectively. The main pump 120 is used to pump the hydraulic oil in the hydraulic oil tank 110 to the reversing control module 400 and the floating switch module 300.

[0057] As shown in FIG. 4, in one optional embodiment, the oil supply module 100 comprises 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 floating switch module 300, respectively. The main pump 120 is used to pump the hydraulic oil in the hydraulic oil tank 110 to the reversing control module 400 and the floating switch module 300.

[0058] Figure 4 ​​As shown, in an optional embodiment, the oil supply module 100 further comprises a total overflow valve 130. The total overflow valve 130 is connected to the oil outlet of the main pump 120 and the hydraulic oil tank 110 respectively, and the total overflow valve 130 is used to deliver the excess hydraulic oil discharged by the main pump 120 back to the hydraulic oil tank 110.

[0059] In this optional embodiment, the total overflow valve 130 is arranged between the oil outlet of the main pump 120 and the hydraulic oil tank 110, and when the oil pressure pumped by the main pump 120 is too high, the total overflow valve 130 can deliver the hydraulic oil back to the oil supply module 100, thereby realizing the pressure regulation of the hydraulic oil, so as to ensure the pressure stability of the control system.

[0060] In a specific embodiment, the bidirectional lock unit 320 is further provided with a center swivel joint 500 between the electromagnetic switching valve 330 and the main valve reversing valve 410, and the center swivel joint 500 can enable the front and rear parts of the hydraulic system pipeline to have a relative swivel motion function without interference of the hydraulic passage.

[0061] The application further discloses a excavator comprising a bulldozing blade device and the bulldozing blade floating control system described in the above embodiments of the application, and the bulldozing blade oil cylinder 200 is arranged in the bulldozing blade device.

[0062] It can be seen that, in the embodiment, the excavator adopts the above bulldozing blade floating control system, the floating function of the bulldozing blade can be turned on or off through the floating switch module 300, and the oil cylinder locking function is realized after the floating function is turned off, so as to avoid the problem that the position of the bulldozing blade oil cylinder 200 is deviated due to the internal leakage of the main valve or the pressure relief of the overflow valve, thereby improving the working condition adaptability and reliability of the excavator. Meanwhile, after the floating function is turned off, even if the operator misoperates the reversing control module 400 to make the bulldozing blade accidentally enter the floating mode during the lowering of the bulldozing blade, the current position of the bulldozing blade oil cylinder 200 is maintained through the above oil cylinder locking function, thereby eliminating the risk that the whole machine falls due to the misoperation of the operator, so as to improve the operation safety of the excavator.

[0063] The technical means disclosed in the application scheme is not limited to the technical means disclosed in the above embodiments, and also includes the technical scheme composed of any combination of the above technical features. It should be pointed out that, for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principle of the application, and these improvements and refinements are also regarded as the protection scope of the application.

Claims

1. A bulldozer blade floating control system, characterized in that: The system comprises: An oil supply module, the oil supply module is used to provide hydraulic oil; A bulldozer oil cylinder, wherein the bulldozer oil cylinder is provided in the bulldozer device to be controlled; a floating switch module, the floating switch module being connected to the oil supply module and the oil circuit of the bulldozer cylinder, respectively, and being used to switch the oil circuit between the oil supply module and the bulldozer cylinder on or off, thereby turning on or off the floating function of the bulldozer device; a reversing control module, the reversing control module being connected to the oil supply module, the floating switch module and the oil circuit of the bulldozer cylinder respectively; The reversing control module is used to control the flow direction of the hydraulic oil to the bulldozer cylinder, so as to control the bulldozer device to standby or perform lifting operations.

2. The bulldozer blade floating control system according to claim 1, characterized in that: The floating switch module includes: A controller, configured to generate an on signal or an off signal according to an external switch control signal; A two-way locking unit, the two-way locking unit being connected to the bulldozer cylinder and the reversing control module oil circuit respectively; An electromagnetic switching valve, the electromagnetic switching valve is electrically connected to the controller, and the electromagnetic switching valve is respectively connected to the oil circuit of the oil supply module and the two-way lock unit. The electromagnetic switching valve is used to open the oil circuit channel between the oil supply module and the two-way lock unit according to the opening signal, so that the double chambers in the bulldozer cylinder are directly connected to the oil circuit of the oil supply module to activate the floating function of the bulldozer device; the electromagnetic switching valve is also used to shut off the oil circuit channel between the oil supply module and the two-way lock unit according to the closing signal, so that the double chambers in the bulldozer cylinder are disconnected from the oil circuit between the oil supply module to shut down the floating function of the bulldozer device.

3. The bulldozer blade floating control system according to claim 2, characterized in that: The reversing control module includes: A main valve reversing valve, the main valve reversing valve being connected to the oil supply module and the oil circuit of the two-way lock unit respectively; A pilot valve, wherein the oil inlet end of the pilot valve is connected to the oil circuit of the oil supply module, the first oil outlet end of the pilot valve is connected to the oil circuit of the first pressure receiving end of the main valve reversing valve, and the second oil outlet end of the pilot valve is connected to the oil circuit of the second pressure receiving end of the main valve reversing valve. The pilot valve is used to switch the oil circuit conduction state between its oil inlet end and its first oil outlet end and the second oil outlet end respectively according to an external switching touch signal, so as to control the oil pressure to the first pressure receiving end and the second pressure receiving end of the main valve reversing valve; Among them, when the first pressure receiving end and the second pressure receiving end of the main valve reversing valve are not subjected to oil pressure, the main valve reversing valve cuts off the oil circuit channel between the oil supply module and the two-way lock unit to control the bulldozer device to standby; when the first pressure receiving end of the main valve reversing valve is subjected to oil pressure, the main valve reversing valve opens the oil circuit channel of the oil supply module to the two-way lock unit and the first chamber of the bulldozer cylinder to control the bulldozer device to perform a lifting operation; when the second pressure receiving end of the main valve reversing valve is subjected to oil pressure, the main valve reversing valve opens the oil circuit channel of the oil supply module to the two-way lock unit and the second chamber of the bulldozer cylinder, and the bulldozer device performs a descending operation.

4. The bulldozer blade floating control system according to claim 3, characterized in that: The two-way lock unit comprises: A shuttle valve, the shuttle valve being connected to the oil circuits of the electromagnetic switching valve and the main valve reversing valve respectively; A two-way hydraulic lock, the two-way hydraulic lock is respectively connected to the double chambers of the bulldozer cylinder, the main valve reversing valve and the shuttle valve oil circuit; Among them, the bidirectional hydraulic lock is used to open the oil circuit when the pilot control oil port of the bidirectional hydraulic lock receives the oil pressure of the hydraulic oil, and to close the oil circuit when the pilot control oil port of the bidirectional hydraulic lock does not receive the oil pressure of the hydraulic oil.

5. The bulldozer blade floating control system according to claim 3, characterized in that: The reversing control module further includes: A pilot pressure reducing valve is connected to the oil supply module and the oil inlet end oil circuit of the pilot valve respectively, and is used to transport the over-pressure hydraulic oil back to the oil supply module to reduce the pressure of the hydraulic oil provided by the oil supply module.

6. The bulldozer blade floating control system according to claim 3, characterized in that: The reversing control module further includes: A main valve compensating valve is connected to the oil supply module and the oil outlet oil circuit of the main valve reversing valve respectively, and the main valve compensating valve is used to perform pressure compensation on the oil outlet end of the main valve reversing valve.

7. The bulldozer blade floating control system according to claim 6, characterized in that: The reversing control module further includes: The main valve overflow valve is connected to the oil supply module and the main valve reversing valve oil circuit respectively, and is used to transport excess hydraulic oil at the oil outlet end of the main valve reversing valve back to the oil supply module.

8. The bulldozer blade floating control system according to any one of claims 1 to 7, characterized in that: The oil supply module includes: a hydraulic oil tank, the hydraulic oil tank being used to store the hydraulic oil; A main pump is connected to the hydraulic oil tank, the reversing control module and the floating switch module respectively, and is used to pump the hydraulic oil in the hydraulic oil tank to the reversing control module and the floating switch module.

9. The bulldozer blade floating control system according to claim 8, characterized in that: The oil supply module also includes: A total relief valve is connected to the oil outlet of the main pump and the oil circuit of the hydraulic oil tank respectively, and is used to transport the excess hydraulic oil discharged by the main pump back to the hydraulic oil tank.

10. An excavator, characterized in that: The excavator comprises: Bulldozer device; The bulldozer blade floating control system according to any one of claims 1 to 9; wherein the bulldozer blade cylinder is arranged in the bulldozer blade device.

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