Hydraulic systems and construction machinery

Abstract

The present invention provides a hydraulic system and engineering machinery, wherein the hydraulic system comprises: a hydraulic oil tank; a pump station connected to the hydraulic oil tank; a first multi-way valve connected to the pump station; a second multi-way valve connected to the pump station; a first hydraulically controlled reversing valve, when the first hydraulically controlled reversing valve is in a first position, the first multi-way valve is connected to the pump station, and when the first hydraulically controlled reversing valve is in a second position, the first multi-way valve is connected to the hydraulic oil tank; a second hydraulically controlled reversing valve, connected to the second multi-way valve; a third hydraulically controlled reversing valve, connected to the second multi-way valve; a first driving member, connected to the second and third hydraulically controlled reversing valves, when the second hydraulically controlled reversing valve is in the first position and the third hydraulically controlled reversing valve is in the first position, the first driving member is in a working state; a second driving member, connected to the second and third hydraulically controlled reversing valves, when the second hydraulically controlled reversing valve is in the second position and the third hydraulically controlled reversing valve is in the second position, the second driving member is in a working state.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to a hydraulic system and an engineering machinery. Background Art

[0002] In the related art, beam supports driven by human power often have low working efficiency and are prone to causing personal injury due to situations such as steel beams falling off; beam supports driven by motors need to be equipped with driving or transmission devices such as motors and screws, have complex structures, low flexibility, and are difficult to accurately position. Summary of the invention

[0003] In order to solve or improve at least one of the above technical problems, an object of the present invention is to provide a hydraulic system.

[0004] Another object of the present invention is to provide an engineering machine having the above hydraulic system.

[0005] To achieve the above-mentioned purpose, the first aspect of the present invention provides a hydraulic system, comprising: a hydraulic oil tank; a pump station connected to the hydraulic oil tank; a first multi-way valve connected to the pump station; a second multi-way valve connected to the pump station; a first hydraulically controlled reversing valve connected to the first multi-way valve, the first hydraulically controlled reversing valve is connected to the pump station, the first hydraulically controlled reversing valve is connected to the hydraulic oil tank, when the first hydraulically controlled reversing valve is in the first position, the first multi-way valve is connected to the pump station, when the first hydraulically controlled reversing valve is in the second position, the first multi-way valve is connected to the hydraulic oil tank; the second hydraulically controlled reversing valve is connected to the first multi-way valve, a hydraulically controlled directional valve connected to the second multi-way valve; a third hydraulically controlled directional valve connected to the second multi-way valve; a first drive member connected to the second hydraulically controlled directional valve, and the first drive member is connected to the third hydraulically controlled directional valve, when the second hydraulically controlled directional valve is in the first position and the third hydraulically controlled directional valve is in the first position, the first drive member is in a working state; a second drive member is connected to the third hydraulically controlled directional valve, and the second drive member is connected to the second hydraulically controlled directional valve, when the second hydraulically controlled directional valve is in the second position and the third hydraulically controlled directional valve is in the second position, the second drive member is in a working state.

[0006] According to the embodiment of the hydraulic system provided by the present invention, the driving member is driven by the hydraulic system. Compared with the human-driven or motor-driven methods, it has a simple structure, high sensitivity, and is easy to accurately position, and can also improve work efficiency and safety performance. The first driving member is used for excavation work, and the second driving member is used for support operations. A branch oil circuit is added to the hydraulic oil circuit of the first driving member to control the second driving member to achieve functional switching between excavation and support operations. When the second driving member is in a working state, the first driving member is in a locked state. In addition, by adding a first hydraulically controlled reversing valve, when supporting operations are achieved, the star wheel and the first-motor motor are in a locked state to avoid personal injury or equipment damage due to misoperation.

[0007] Specifically, the hydraulic system includes a hydraulic oil tank, a pump station, a first multi-way valve, a second multi-way valve, a first hydraulically controlled reversing valve, a second hydraulically controlled reversing valve, a third hydraulically controlled reversing valve, a first driving member, and a second driving member. The hydraulic oil tank is a storage container for storing a working medium. The working medium may be a medium such as hydraulic oil. The pump station is connected to the hydraulic oil tank. The first multi-way valve is connected to the pump station, and the second multi-way valve is connected to the pump station. Optionally, the pump station includes at least two connected pump bodies, one of which is used to connect to the first multi-way valve, and the pump body can pump the working medium in the hydraulic oil tank to the first multi-way valve, and then the first multi-way valve distributes the working medium to each actuator; the other pump body is used to connect to the second multi-way valve, and the pump body can pump the working medium in the hydraulic oil tank to the second multi-way valve, and then the second multi-way valve distributes the working medium to each actuator. Optionally, the first multi-way valve is used to connect with the left planetary gear motor, the right planetary gear motor and the first travel motor, etc. The second multi-way valve is used to connect with the blade lifting drive, the cutting head lifting drive, the cutting head rotating drive, the cutting head telescopic drive, the rear support drive, the left travel drive and the right travel drive, etc.

[0008] Further, the first hydraulically controlled reversing valve is connected to the first multi-way valve. The first hydraulically controlled reversing valve is connected to the pump station. The first hydraulically controlled reversing valve is connected to the hydraulic oil tank. Optionally, the first hydraulically controlled reversing valve has a first interface, a second interface and a third interface. The first interface of the first hydraulically controlled reversing valve is connected to the first multi-way valve; the second interface of the first hydraulically controlled reversing valve is connected to the pump station; the third interface of the first hydraulically controlled reversing valve is connected to the hydraulic oil tank.

[0009] When the first hydraulically controlled reversing valve is in the first working position, the first interface is connected to the second interface, and the first multi-way valve is connected to the pump station. Specifically, the pump station includes a first pump body and a second pump body connected. The first pump body has an oil outlet and a control oil port. The first multi-way valve has an oil inlet and a load-sensitive oil port. The oil outlet of the first pump body is connected to the oil inlet of the first multi-way valve. The load-sensitive oil port is connected to the first interface. The second interface is connected to the control oil port. When the first hydraulically controlled reversing valve is in the first working position, the first interface is connected to the second interface, and the feedback oil circuit passes through the load-sensitive oil port, the first interface, the second interface and the control oil port in sequence. After the control oil port receives the working medium of the feedback oil circuit, the first pump body can pump the working medium in the hydraulic oil tank to the first multi-way valve, and then the first multi-way valve distributes the working medium to the left star gear motor, the right star gear motor or the first transport motor and other driving parts. It can be understood that when the first hydraulically controlled reversing valve is in the first working position, the driving parts such as the left planetary gear motor, the right planetary gear motor or the first-motion motor are in working state.

[0010] When the first hydraulically controlled reversing valve is in the second position, the first multi-way valve is connected to the hydraulic oil tank. Specifically, when the first hydraulically controlled reversing valve is in the first position, the first interface is connected to the third interface, and the feedback oil circuit passes through the load-sensitive oil port, the first interface, the third interface and the hydraulic oil tank in sequence. The control oil port of the first pump body does not receive the working medium of the feedback oil circuit, and at this time the first pump body will not pump the working medium to the first multi-way valve. It can be understood that when the first hydraulically controlled reversing valve is in the second position, the driving parts such as the left planetary gear motor, the right planetary gear motor or the first transport motor are in a locked state.

[0011] Further, the second hydraulically controlled reversing valve is connected to the second multi-way valve. The third hydraulically controlled reversing valve is connected to the second multi-way valve. Optionally, the second hydraulically controlled reversing valve and the third hydraulically controlled reversing valve are connected to the same connection of the second multi-way valve. Further, the first drive is connected to the second hydraulically controlled reversing valve, and the first drive is connected to the third hydraulically controlled reversing valve. Optionally, the first drive is a cutting and telescopic drive; the second drive is a beam support drive. Specifically, the first drive is a first oil cylinder, the first oil cylinder has a first rod cavity and a first rodless cavity; the second drive is a second oil cylinder, the second oil cylinder has a second rod cavity and a second rodless cavity. The second hydraulically controlled reversing valve has a fourth interface, a fifth interface and a sixth interface. The fourth interface is connected to the second multi-way valve; the fifth interface is connected to the first rodless cavity; the sixth interface is connected to the second rodless cavity. The fourth interface is selectively connected to the fifth interface or the sixth interface. When the second hydraulically controlled reversing valve is in the first working position, the fourth interface is connected to the fifth interface. At this time, the second pump body of the pump station can sequentially pass the working medium in the hydraulic oil tank through the second multi-way valve, the fourth interface and the fifth interface into the first rodless chamber; when the second hydraulically controlled reversing valve is in the second working position, the fourth interface is connected to the sixth interface. At this time, the second pump body of the pump station can sequentially pass the working medium in the hydraulic oil tank through the second multi-way valve, the fourth interface and the sixth interface into the second rodless chamber.

[0012] Further, the second drive member is connected to the third hydraulically controlled reversing valve, and the second drive member is connected to the second hydraulically controlled reversing valve. Optionally, the third hydraulically controlled reversing valve has a seventh interface, an eighth interface and a ninth interface. The seventh interface is connected to the second multi-way valve; the eighth interface is connected to the first rod chamber; the ninth interface is connected to the second rod chamber. The seventh interface is selectively connected to the eighth interface or the ninth interface. When the third hydraulically controlled reversing valve is in the first position, the seventh interface is connected to the eighth interface, at which time the second pump body of the pump station can sequentially pass the working medium in the hydraulic oil tank through the second multi-way valve, the seventh interface and the eighth interface into the first rod chamber; when the third hydraulically controlled reversing valve is in the second position, the seventh interface is connected to the ninth interface, at which time the second pump body of the pump station can sequentially pass the working medium in the hydraulic oil tank through the second multi-way valve, the seventh interface and the ninth interface into the second rod chamber.

[0013] In other words, when the second hydraulically controlled reversing valve is in the first position and the third hydraulically controlled reversing valve is in the first position, the first driving member is in the working state. When the second hydraulically controlled reversing valve is in the second position and the third hydraulically controlled reversing valve is in the second position, the second driving member is in the working state.

[0014] In the technical solution defined in the present invention, the driving member is driven by a hydraulic system. Compared with the human-driven or motor-driven methods, it has a simple structure, high sensitivity, and is easy to accurately position. It can also improve work efficiency and safety performance. The first driving member is used for excavation work, and the second driving member is used for support operations. A branch oil circuit is added to the hydraulic oil circuit of the first driving member to control the second driving member to achieve functional switching between excavation and support operations. When the second driving member is in a working state, the first driving member is in a locked state. In addition, by adding a first hydraulically controlled reversing valve, when supporting operations are achieved, the star wheel and the first-motor motor are in a locked state to avoid personal injury or equipment damage due to misoperation.

[0015] In addition, the above technical solution provided by the present invention may also have the following additional technical features:

[0016] In the above technical solution, the first multi-way valve has an oil inlet and a load-sensitive oil port, the first hydraulically controlled reversing valve has a first interface, a second interface and a third interface, the first interface is connected to the load-sensitive oil port, the second interface is connected to the pump station, the third interface is connected to the hydraulic oil tank, the first interface is selectively connected to the second interface or the third interface, when the first hydraulically controlled reversing valve is in the first position, the first interface is connected to the second interface; when the first hydraulically controlled reversing valve is in the second position, the first interface is connected to the third interface.

[0017] In this technical solution, the first interface of the first hydraulically controlled reversing valve is connected to the load-sensitive oil port (LS port) of the first multi-way valve, the second interface of the first hydraulically controlled reversing valve is connected to the control oil port of the pump station, and the third interface of the first hydraulically controlled reversing valve is connected to the hydraulic oil tank. When the engineering machinery is in the excavation state, the first hydraulically controlled reversing valve is in the first working position (the first interface is connected to the second interface), and the feedback oil circuit passes through the load-sensitive oil port, the first interface, the second interface and the control oil port in sequence. After the control oil port receives the working medium of the feedback oil circuit, the first pump body can pump the working medium in the hydraulic oil tank to the first multi-way valve, and then the first multi-way valve distributes the working medium to the left star gear motor, the right star gear motor or the first transport motor and other driving parts. It can be understood that when the first hydraulically controlled reversing valve is in the first position, the left planetary gear motor, the right planetary gear motor or the first-transmission motor and other driving parts are in working state; when the engineering machinery performs support operations, the first hydraulically controlled reversing valve is in the second position (the first interface is connected to the third interface), and the feedback oil circuit passes through the load-sensitive oil port, the first interface, the third interface and the hydraulic oil tank in sequence. The control oil port of the first pump body does not receive the working medium of the feedback oil circuit, and at this time the first pump body will not pump the working medium to the first multi-way valve. It can be understood that when the first hydraulically controlled reversing valve is in the second position, the left planetary gear motor, the right planetary gear motor or the first-transmission motor and other driving parts are in a locked state.

[0018] In the technical solution defined in the present invention, a first hydraulically controlled reversing valve is added to the LS feedback oil circuit of the first multi-way valve to achieve the locking of the star wheel and the first motor during the support operation to avoid personal injury and equipment damage due to misoperation. The first hydraulically controlled reversing valve changes the station to reverse the LS oil circuit of the first multi-way valve, from the original feedback to the front pump (first pump body) of the pump station to returning to the hydraulic oil tank. Because the plunger pump used in the hydraulic system of the present invention is a load-sensitive pump, when there is no LS oil circuit feedback, the swash plate swing angle of the front pump is the minimum angle, and the front pump has no flow output. Therefore, when the pilot handle of the star wheel and the first motor is pushed, the star wheel and the first motor have no action, that is, the star wheel and the first motor are locked when the beam support device is working.

[0019] In the above technical scheme, the first driving member is a first oil cylinder, and the first oil cylinder has a first rod chamber and a first rodless chamber, and the second driving member is a second oil cylinder, and the second oil cylinder has a second rod chamber and a second rodless chamber; the second hydraulically controlled reversing valve has a fourth interface, a fifth interface and a sixth interface, the fourth interface is connected to the second multi-way valve, the fifth interface is connected to the first rodless chamber, the sixth interface is connected to the second rodless chamber, and the fourth interface is selectively connected to the fifth interface or the sixth interface, and when the second hydraulically controlled reversing valve is in the first working position, the fourth interface is connected to the fifth interface; when the second hydraulically controlled reversing valve is in the second working position, the fourth interface is connected to the sixth interface; the third hydraulically controlled reversing valve has a seventh interface, an eighth interface and a ninth interface, the seventh interface is connected to the second multi-way valve, the eighth interface is connected to the first rod chamber, the ninth interface is connected to the second rod chamber, and the seventh interface is selectively connected to the eighth interface or the ninth interface, and when the third hydraulically controlled reversing valve is in the first working position, the seventh interface is connected to the eighth interface; when the third hydraulically controlled reversing valve is in the second working position, the seventh interface is connected to the ninth interface.

[0020] In this technical solution, when the second hydraulically controlled reversing valve is in the first position (the fourth interface is connected to the fifth interface), the second pump body of the pump station can sequentially pass the working medium in the hydraulic oil tank through the second multi-way valve, the fourth interface and the fifth interface to enter the first rodless chamber; when the second hydraulically controlled reversing valve is in the second position (the fourth interface is connected to the sixth interface), the second pump body of the pump station can sequentially pass the working medium in the hydraulic oil tank through the second multi-way valve, the fourth interface and the sixth interface to enter the second rodless chamber. When the third hydraulically controlled reversing valve is in the first position (the seventh interface is connected to the eighth interface), the second pump body of the pump station can sequentially pass the working medium in the hydraulic oil tank through the second multi-way valve, the seventh interface and the eighth interface to enter the first rod chamber; when the third hydraulically controlled reversing valve is in the second position (the seventh interface is connected to the ninth interface), the second pump body of the pump station can sequentially pass the working medium in the hydraulic oil tank through the second multi-way valve, the seventh interface and the ninth interface to enter the second rod chamber.

[0021] In other words, when the second hydraulically controlled reversing valve is in the first position and the third hydraulically controlled reversing valve is in the first position, the first driving member is in the working state. When the second hydraulically controlled reversing valve is in the second position and the third hydraulically controlled reversing valve is in the second position, the second driving member is in the working state.

[0022] In the above technical solution, the sixth interface is connected to the second rodless chamber through a first fluid circuit, and the hydraulic system further includes: a speed regulating valve group, which is arranged in the first fluid circuit.

[0023] In this technical solution, the second multi-way valve is a proportional valve, which can adjust the movement speed of the driving member, but the pressure and flow of the multi-way valve are pre-adjusted, so there are certain limitations on the speed regulation range of the second driving member, which cannot meet the precise positioning requirements of the beam supporter after it moves to the working position. By adding a speed regulating valve group, the oil circuit of the beam supporter cylinder can be significantly reduced, so that the beam supporter cylinder can achieve real-time speed regulation at a lower pressure and flow, thereby meeting the precise positioning requirements of the beam supporter after it moves to the vicinity of the working position.

[0024] In the above technical scheme, the speed control valve group includes: a manual reversing valve, having a tenth interface, an eleventh interface and a twelfth interface, the tenth interface is connected to the sixth interface, the eleventh interface is connected to the sixth interface, the twelfth interface is connected to the second rodless chamber, and the twelfth interface is selectively connected to the tenth interface or the eleventh interface; a throttle valve, arranged at the eleventh interface, when the twelfth interface is connected to the tenth interface, the working medium passes through the sixth interface, the tenth interface, the twelfth interface and the second rodless chamber in sequence; when the twelfth interface is connected to the eleventh interface, the working medium passes through the sixth interface, the throttle valve, the eleventh interface, the twelfth interface and the second rodless chamber in sequence.

[0025] In the technical solution, the speed regulating valve group includes a manual reversing valve and a throttle valve. Specifically, the manual reversing valve has a tenth interface, an eleventh interface and a twelfth interface. The tenth interface of the manual reversing valve is connected to the sixth interface of the second hydraulically controlled reversing valve; the eleventh interface of the manual reversing valve is connected to the sixth interface of the second hydraulically controlled reversing valve; the twelfth interface of the manual reversing valve is connected to the second rodless chamber. The throttle valve is provided at the eleventh interface of the manual reversing valve. The twelfth interface is selectively connected to the tenth interface or the eleventh interface.

[0026] Specifically, when the manual reversing valve is in the left position, the twelfth interface is connected to the tenth interface, and the working medium passes through the sixth interface, the tenth interface, the twelfth interface and the second rodless cavity in sequence. At this time, the movement speed of the second drive member can be adjusted by controlling the opening of the handle assembly; when the manual reversing valve is in the right position, the twelfth interface is connected to the eleventh interface, and the working medium passes through the sixth interface, the throttle valve, the eleventh interface, the twelfth interface and the second rodless cavity in sequence. Since this oil circuit is provided with a throttle valve, the throttle valve plays a throttling role, so the low-speed working mode can be switched by turning the manual reversing valve to the right position. In this way, the oil circuit of the second drive member can be significantly reduced, so that the second drive member can complete real-time speed regulation at a lower pressure and flow rate, thereby meeting the precise positioning of the beam support after moving to the vicinity of the working position.

[0027] In the above technical solution, the first multi-way valve has a first pilot oil port, the second multi-way valve has a second pilot oil port, and the hydraulic system also includes: a shuttle valve connected to the first pilot oil port, the shuttle valve is connected to the second pilot oil port; a handle assembly, connected to the shuttle valve; a pull-out valve, connected to the shuttle valve, the pull-out valve is connected to the first hydraulically controlled reversing valve, the pull-out valve is connected to the second hydraulically controlled reversing valve, and the pull-out valve is connected to the third hydraulically controlled reversing valve.

[0028] In this technical solution, the hydraulic system also includes a shuttle valve, a handle assembly and a pull-out valve. Specifically, the first multi-way valve has a first pilot oil port (X port), and the second multi-way valve has a second pilot oil port (X port). The shuttle valve is connected to the first pilot oil port, and the shuttle valve is connected to the second pilot oil port. By setting the shuttle valve, it can play a role in pressure selection, and preferentially selects a working medium with a higher pressure to pass through. Furthermore, the handle assembly is connected to the shuttle valve. Optionally, the handle assembly includes a connected pilot handle and a four-way handle. Among them, the pilot handle is used to control the forward and backward movement of the left travel drive member; the pilot handle is used to control the forward and backward movement of the right travel drive member; the pilot handle is used to control the extension and retraction of the rear support drive member; the pilot handle is used to control the descent and ascent of the shovel lifting drive member; the pilot handle is used to control the forward and reverse rotation of the first travel motor; the pilot handle is used to control the forward and reverse rotation of the star wheel motor. In addition, the four-way handle is used to control the rise and fall of the cutting head lifting drive; the four-way handle is used to control the left and right turn of the cutting head rotary drive. Further, the pull-out valve is connected to the shuttle valve, the pull-out valve is connected to the first hydraulically controlled reversing valve, the pull-out valve is connected to the second hydraulically controlled reversing valve, and the pull-out valve is connected to the third hydraulically controlled reversing valve. The pull-out valve controls the opening and closing of the first oil circuit. After switching the pull-out valve position, the first hydraulically controlled reversing valve, the second hydraulically controlled reversing valve, and the third hydraulically controlled reversing valve can return to their original positions.

[0029] The above technical solution also includes: a balancing valve connected to the second hydraulically controlled reversing valve, and the balancing valve is connected to the first driving member; and / or the balancing valve is connected to the third hydraulically controlled reversing valve, and the balancing valve is connected to the second driving member.

[0030] In this technical solution, by setting a balancing valve, the flow resistance through the valve can be changed to achieve the purpose of regulating the flow. Usually, there is a large pressure difference or flow difference in various parts of the medium in the pipeline or container. The balancing valve can reduce or balance the pressure difference to adjust the relative balance of pressure on both sides, or achieve flow balance by diversion.

[0031] In the above technical solution, the handle assembly includes a pilot handle and a four-way handle that are connected.

[0032] In this technical solution, the pilot handle is used to control the forward and backward movement of the left travel drive; the pilot handle is used to control the forward and backward movement of the right travel drive; the pilot handle is used to control the extension and retraction of the rear support drive; the pilot handle is used to control the descent and ascent of the shovel lifting drive; the pilot handle is used to control the forward and reverse rotation of the first motor; the pilot handle is used to control the forward and reverse rotation of the star wheel motor. The four-way handle is used to control the ascent and descent of the cutting head lifting drive; the four-way handle is used to control the left and right rotation of the cutting head rotary drive.

[0033] In the above technical solution, the pump station includes at least two connected pump bodies, at least one pump body is connected to the first multi-way valve, and the pump body is connected to the first hydraulically controlled reversing valve; at least one pump body is connected to the second multi-way valve.

[0034] In this technical solution, the pump station includes at least two connected pump bodies, and the number of pump bodies is at least two, that is, the pump bodies can be two or more, and the pump bodies are flexibly arranged according to actual needs. At least one pump body is connected to the first multi-way valve, and the pump body is connected to the first hydraulically controlled reversing valve; at least one pump body is connected to the second multi-way valve. Optionally, the pump station includes a first pump body and a second pump body connected. The first pump body has an oil outlet and a control oil port. The first multi-way valve has an oil inlet and a load-sensitive oil port. The oil outlet of the first pump body is connected to the oil inlet of the first multi-way valve. The load-sensitive oil port is connected to the first interface. The second interface is connected to the control oil port of the first pump body. When the first hydraulically controlled reversing valve is in the first position, the first interface is connected to the second interface, and the feedback oil circuit passes through the load-sensitive oil port, the first interface, the second interface and the control oil port in sequence. After the control oil port receives the working medium of the feedback oil circuit, the first pump body can pump the working medium in the hydraulic oil tank to the first multi-way valve, and then the first multi-way valve distributes the working medium to the left planetary gear motor, the right planetary gear motor or the first motor and other driving parts. In addition, the second pump body can pump the working medium in the hydraulic oil tank to the second multi-way valve, and then the second multi-way valve distributes it to each driving part.

[0035] A second aspect of the present invention provides an engineering machine, comprising: a hydraulic system in any one of the above embodiments; and a beam support connected to a second driving member of the hydraulic system.

[0036] According to an embodiment of the engineering machinery of the present invention, the engineering machinery comprises the hydraulic system and the beam support device in any of the above embodiments. The beam support device is connected to the second driving member of the hydraulic system. Optionally, the engineering machinery further comprises a cutting part, a planetary gear motor and a first-transmission motor. The cutting part is connected to the first driving member; the planetary gear motor is connected to the first multi-way valve; and the first-transmission motor is connected to the first multi-way valve.

[0037] It is worth mentioning that construction machinery can be equipment such as tunnel boring machines.

[0038] Among them, since the engineering machinery includes any hydraulic system in the above-mentioned first aspect, it has the beneficial effects of any of the above-mentioned embodiments, which will not be described in detail here.

[0039] Additional aspects and advantages of embodiments of the present invention will become apparent in the following description or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of a hydraulic system according to an embodiment of the present invention is shown;

[0041] Figure 2 A schematic diagram of a speed regulating valve group according to an embodiment of the present invention is shown;

[0042] Figure 3 A schematic diagram of a construction machine according to an embodiment of the present invention is shown.

[0043] in, Figures 1 to 3 The corresponding relationship between the reference numerals and the component names is as follows:

[0044] 100: Hydraulic system; 111: Hydraulic oil tank; 112: Pump station; 1121: First pump body; 1122: Second pump body; 121: First multi-way valve; 1211: Oil inlet; 1212: Load-sensing oil port; 1213: First pilot oil port; 122: Second multi-way valve; 1221: Second pilot oil port; 131: First hydraulic control reversing valve; 1311: First interface; 1312: Second interface; 1313: Third interface; 132: Second hydraulic control reversing valve; 1321: Fourth interface; 1322: Fifth interface; 1323: Sixth interface; 133: Third hydraulic control reversing valve; 1331: Seventh interface ;1332: the eighth interface;1333: the ninth interface;141: the first driving member;1411: the first rod chamber;1412: the first rodless chamber;142: the second driving member;1421: the second rod chamber;1422: the second rodless chamber;150: the speed regulating valve group;151: the manual reversing valve;1511: the tenth interface;1512: the eleventh interface;1513: the twelfth interface;152: the throttle valve;161: the shuttle valve;162: the pull-out valve;163: the balancing valve;170: the handle assembly;171: the pilot handle;172: the four-way handle;181: the first liquid circuit;200: the engineering machinery;210: the beam support device. DETAILED DESCRIPTION

[0045] In order to more clearly understand the above-mentioned purposes, features and advantages of the embodiments of the present invention, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0046] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the embodiments of the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0047] Refer to the following Figures 1 to 3 A hydraulic system 100 and a construction machine 200 provided according to some embodiments of the present invention are described.

[0048] Embodiment 1

[0049] like Figure 1 As shown, a hydraulic system 100 provided by one embodiment of the present invention includes a hydraulic oil tank 111, a pump station 112, a first multi-way valve 121, a second multi-way valve 122, a first hydraulically controlled reversing valve 131, a second hydraulically controlled reversing valve 132, a third hydraulically controlled reversing valve 133, a first driving member 141 and a second driving member 142. The hydraulic oil tank 111 is a storage container for storing a working medium. The working medium may be a medium such as hydraulic oil. The pump station 112 is connected to the hydraulic oil tank 111. The first multi-way valve 121 is connected to the pump station 112, and the second multi-way valve 122 is connected to the pump station 112. Optionally, the pump station 112 includes at least two connected pump bodies, one of which is used to connect with the first multi-way valve 121, and the pump body can pump the working medium in the hydraulic oil tank 111 to the first multi-way valve 121, and then the first multi-way valve 121 distributes the working medium to each actuator; the other pump body is used to connect with the second multi-way valve 122, and the pump body can pump the working medium in the hydraulic oil tank 111 to the second multi-way valve 122, and then the second multi-way valve 122 distributes the working medium to each actuator. Optionally, the first multi-way valve 121 is used to connect with the left star gear motor, the right star gear motor and the first travel motor. The second multi-way valve 122 is used to connect with the blade lifting drive, the cutting head lifting drive, the cutting head rotation drive, the cutting head telescopic drive, the rear support drive, the left travel drive and the right travel drive.

[0050] Further, the first hydraulically controlled reversing valve 131 is connected to the first multi-way valve 121. The first hydraulically controlled reversing valve 131 is connected to the pump station 112. The first hydraulically controlled reversing valve 131 is connected to the hydraulic oil tank 111. Optionally, the first hydraulically controlled reversing valve 131 has a first interface 1311, a second interface 1312 and a third interface 1313. The first interface 1311 of the first hydraulically controlled reversing valve 131 is connected to the first multi-way valve 121; the second interface 1312 of the first hydraulically controlled reversing valve 131 is connected to the pump station 112; the third interface 1313 of the first hydraulically controlled reversing valve 131 is connected to the hydraulic oil tank 111.

[0051] When the first hydraulically controlled reversing valve 131 is in the first working position, the first interface 1311 is connected to the second interface 1312, and the first multi-way valve 121 is connected to the pump station 112. Specifically, the pump station 112 includes a first pump body 1121 and a second pump body 1122 connected to each other. The first pump body 1121 has an oil outlet and a control oil port. The first multi-way valve 121 has an oil inlet 1211 and a load-sensitive oil port 1212. The oil outlet of the first pump body 1121 is connected to the oil inlet 1211 of the first multi-way valve 121. The load-sensitive oil port 1212 is connected to the first interface 1311. The second interface 1312 is connected to the control oil port. When the first hydraulically controlled reversing valve 131 is in the first working position, the first interface 1311 is connected to the second interface 1312, and the feedback oil circuit passes through the load-sensitive oil port 1212, the first interface 1311, the second interface 1312 and the control oil port in sequence. After the control oil port receives the working medium of the feedback oil circuit, the first pump body 1121 can pump the working medium in the hydraulic oil tank 111 to the first multi-way valve 121, and then the first multi-way valve 121 distributes the working medium to the left planetary gear motor, the right planetary gear motor or the first motor and other driving parts. It can be understood that when the first hydraulic control reversing valve 131 is in the first position, the left planetary gear motor, the right planetary gear motor or the first motor and other driving parts are in working state.

[0052] When the first hydraulically controlled reversing valve 131 is in the second position, the first multi-way valve 121 is connected to the hydraulic oil tank 111. Specifically, when the first hydraulically controlled reversing valve 131 is in the first position, the first interface 1311 is connected to the third interface 1313, and the feedback oil circuit passes through the load-sensitive oil port 1212, the first interface 1311, the third interface 1313 and the hydraulic oil tank 111 in sequence. The control oil port of the first pump body 1121 does not receive the working medium of the feedback oil circuit, and at this time, the first pump body 1121 will not pump the working medium to the first multi-way valve 121. It can be understood that when the first hydraulically controlled reversing valve 131 is in the second position, the driving parts such as the left planetary gear motor, the right planetary gear motor or the first transport motor are in a locked state.

[0053] Further, the second hydraulically controlled reversing valve 132 is connected to the second multi-way valve 122. The third hydraulically controlled reversing valve 133 is connected to the second multi-way valve 122. Optionally, the second hydraulically controlled reversing valve 132 and the third hydraulically controlled reversing valve 133 are connected to the same connection of the second multi-way valve 122. Further, the first driving member 141 is connected to the second hydraulically controlled reversing valve 132, and the first driving member 141 is connected to the third hydraulically controlled reversing valve 133. Optionally, the first driving member 141 is a cutting and telescopic driving member; the second driving member 142 is a beam support driving member. Specifically, the first driving member 141 is a first oil cylinder, and the first oil cylinder has a first rod chamber 1411 and a first rodless chamber 1412; the second driving member 142 is a second oil cylinder, and the second oil cylinder has a second rod chamber 1421 and a second rodless chamber 1422. The second hydraulically controlled reversing valve 132 has a fourth interface 1321, a fifth interface 1322 and a sixth interface 1323. The fourth interface 1321 is connected to the second multi-way valve 122; the fifth interface 1322 is connected to the first rodless cavity 1412; and the sixth interface 1323 is connected to the second rodless cavity 1422. The fourth interface 1321 is selectively connected to the fifth interface 1322 or the sixth interface 1323. When the second hydraulically controlled reversing valve 132 is in the first working position, the fourth interface 1321 is connected to the fifth interface 1322. At this time, the second pump body 1122 of the pump station 112 can sequentially pass the working medium in the hydraulic oil tank 111 through the second multi-way valve 122, the fourth interface 1321 and the fifth interface 1322 to enter the first rodless chamber 1412; when the second hydraulically controlled reversing valve 132 is in the second working position, the fourth interface 1321 is connected to the sixth interface 1323. At this time, the second pump body 1122 of the pump station 112 can sequentially pass the working medium in the hydraulic oil tank 111 through the second multi-way valve 122, the fourth interface 1321 and the sixth interface 1323 to enter the second rodless chamber 1422.

[0054] Further, the second driving member 142 is connected to the third hydraulically controlled reversing valve 133, and the second driving member 142 is connected to the second hydraulically controlled reversing valve 132. Optionally, the third hydraulically controlled reversing valve 133 has a seventh interface 1331, an eighth interface 1332, and a ninth interface 1333. The seventh interface 1331 is connected to the second multi-way valve 122; the eighth interface 1332 is connected to the first rod chamber 1411; and the ninth interface 1333 is connected to the second rod chamber 1421. The seventh interface 1331 is selectively connected to the eighth interface 1332 or the ninth interface 1333. When the third hydraulically controlled reversing valve 133 is in the first working position, the seventh interface 1331 is connected to the eighth interface 1332. At this time, the second pump body 1122 of the pump station 112 can sequentially pass the working medium in the hydraulic oil tank 111 through the second multi-way valve 122, the seventh interface 1331 and the eighth interface 1332 to enter the first rod chamber 1411; when the third hydraulically controlled reversing valve 133 is in the second working position, the seventh interface 1331 is connected to the ninth interface 1333. At this time, the second pump body 1122 of the pump station 112 can sequentially pass the working medium in the hydraulic oil tank 111 through the second multi-way valve 122, the seventh interface 1331 and the ninth interface 1333 to enter the second rod chamber 1421.

[0055] In other words, when the second hydraulically controlled reversing valve 132 is in the first position and the third hydraulically controlled reversing valve 133 is in the first position, the first driving member 141 is in the working state. When the second hydraulically controlled reversing valve 132 is in the second position and the third hydraulically controlled reversing valve 133 is in the second position, the second driving member 142 is in the working state.

[0056] In the technical solution defined in the present invention, the driving member is driven by the hydraulic system 100. Compared with the human-driven or motor-driven methods, it has a simple structure, high sensitivity, and is easy to accurately position. It can also improve work efficiency and safety performance. The first driving member 141 is used for excavation work, and the second driving member 142 is used for support operations. A branch oil circuit is added to the hydraulic oil circuit of the first driving member 141 to control the second driving member 142 to achieve functional switching of excavation and support operations. When the second driving member 142 is in a working state, the first driving member 141 is in a locked state. In addition, by adding a first hydraulically controlled reversing valve 131, when supporting operations are implemented, the star wheel and the first motor are in a locked state to avoid personal injury or equipment damage due to misoperation.

[0057] In another embodiment, the first multi-way valve is a triple-way valve. By setting the first multi-way valve as a triple-way valve, the first multi-way valve can be connected to the left planetary gear motor, the right planetary gear motor and a transport motor.

[0058] In another embodiment, the second multi-way valve is a seven-way valve. The second multi-way valve is used to connect with the blade lifting drive, the cutting head lifting drive, the cutting head rotating drive, the cutting head telescopic drive, the rear support drive, the left travel drive, and the right travel drive.

[0059] Embodiment 2

[0060] like Figure 1 As shown, the first interface 1311 of the first hydraulically controlled reversing valve 131 is connected to the load-sensitive oil port 1212 (LS port) of the first multi-way valve 121, the second interface 1312 of the first hydraulically controlled reversing valve 131 is connected to the control oil port of the pump station 112, and the third interface 1313 of the first hydraulically controlled reversing valve 131 is connected to the hydraulic oil tank 111. When the engineering machinery 200 is in the excavation state, the first hydraulically controlled reversing valve 131 is in the first working position (the first interface 1311 is connected to the second interface 1312), and the feedback oil circuit passes through the load-sensitive oil port 1212, the first interface 1311, the second interface 1312 and the control oil port in sequence. After the control oil port receives the working medium of the feedback oil circuit, the first pump body 1121 can pump the working medium in the hydraulic oil tank 111 to the first multi-way valve 121, and then the first multi-way valve 121 distributes the working medium to the left planetary gear motor, the right planetary gear motor or the first motor and other driving parts. It can be understood that when the first hydraulically controlled reversing valve 131 is in the first position, the left planetary gear motor, the right planetary gear motor or the first-running motor and other driving parts are in working state; when the engineering machinery 200 performs support operation, the first hydraulically controlled reversing valve 131 is in the second position (the first interface 1311 is connected to the third interface 1313), and the feedback oil circuit passes through the load-sensitive oil port 1212, the first interface 1311, the third interface 1313 and the hydraulic oil tank 111 in sequence. The control oil port of the first pump body 1121 does not receive the working medium of the feedback oil circuit, and at this time, the first pump body 1121 will not pump the working medium to the first multi-way valve 121. It can be understood that when the first hydraulically controlled reversing valve 131 is in the second position, the left planetary gear motor, the right planetary gear motor or the first-running motor and other driving parts are in a locked state.

[0061] In the technical solution defined in the present invention, a first hydraulically controlled reversing valve 131 is added to the LS feedback oil circuit of the first multi-way valve 121 to achieve the locking of the star wheel and the first motor during the support operation to avoid personal injury and equipment damage due to misoperation. The first hydraulically controlled reversing valve 131 changes the station to change the LS oil circuit of the first multi-way valve 121 from the front pump (first pump body 1121) originally fed back to the pump station 112 to the return to the hydraulic oil tank 111. Because the plunger pump used in the hydraulic system 100 of the present invention is a load-sensitive pump, when there is no LS oil circuit feedback, the swash plate swing angle of the front pump is the minimum angle, and the front pump has no flow output. Therefore, when the pilot handle 171 of the star wheel and the first motor is pushed, the star wheel and the first motor have no action, that is, the star wheel and the first motor are locked when the beam support device 210 is working.

[0062] Embodiment 3

[0063] like Figure 1 As shown, when the second hydraulically controlled reversing valve 132 is in the first working position (the fourth interface 1321 is connected to the fifth interface 1322), the second pump body 1122 of the pump station 112 can sequentially pass the working medium in the hydraulic oil tank 111 through the second multi-way valve 122, the fourth interface 1321 and the fifth interface 1322, and enter the first rodless chamber 1412; when the second hydraulically controlled reversing valve 132 is in the second working position (the fourth interface 1321 is connected to the sixth interface 1323), the second pump body 1122 of the pump station 112 can sequentially pass the working medium in the hydraulic oil tank 111 through the second multi-way valve 122, the fourth interface 1321 and the sixth interface 1323, and enter the second rodless chamber 1422. When the third hydraulically controlled reversing valve 133 is in the first working position (the seventh interface 1331 is connected to the eighth interface 1332), the second pump body 1122 of the pump station 112 can sequentially pass the working medium in the hydraulic oil tank 111 through the second multi-way valve 122, the seventh interface 1331 and the eighth interface 1332 to enter the first rod chamber 1411; when the third hydraulically controlled reversing valve 133 is in the second working position (the seventh interface 1331 is connected to the ninth interface 1333), the second pump body 1122 of the pump station 112 can sequentially pass the working medium in the hydraulic oil tank 111 through the second multi-way valve 122, the seventh interface 1331 and the ninth interface 1333 to enter the second rod chamber 1421.

[0064] In other words, when the second hydraulically controlled reversing valve 132 is in the first position and the third hydraulically controlled reversing valve 133 is in the first position, the first driving member 141 is in the working state. When the second hydraulically controlled reversing valve 132 is in the second position and the third hydraulically controlled reversing valve 133 is in the second position, the second driving member 142 is in the working state.

[0065] Embodiment 4

[0066] like Figure 1 and Figure 2 As shown, the hydraulic system 100 also includes a speed regulating valve group 150. Specifically, the sixth interface 1323 is connected to the second rodless chamber 1422 through the first fluid circuit 181, and the speed regulating valve group 150 is arranged in the first fluid circuit 181. The second multi-way valve 122 is a proportional valve, which can adjust the movement speed of the driving member, but the pressure and flow of the multi-way valve are pre-adjusted, so there are certain limitations on the speed regulation range of the second driving member 142, which cannot meet the precise positioning requirements of the beam supporter 210 after it moves to the working position. By adding the speed regulating valve group 150, the oil circuit of the beam supporter cylinder can be significantly reduced, so that the beam supporter cylinder can achieve real-time speed regulation at a lower pressure and flow, thereby meeting the precise positioning requirements of the beam supporter 210 after it moves to the vicinity of the working position.

[0067] Further, the speed regulating valve group 150 includes a manual reversing valve 151 and a throttle valve 152. Specifically, the manual reversing valve 151 has a tenth interface 1511, an eleventh interface 1512 and a twelfth interface 1513. The tenth interface 1511 of the manual reversing valve 151 is connected to the sixth interface 1323 of the second hydraulically controlled reversing valve 132; the eleventh interface 1512 of the manual reversing valve 151 is connected to the sixth interface 1323 of the second hydraulically controlled reversing valve 132; the twelfth interface 1513 of the manual reversing valve 151 is connected to the second rodless chamber 1422. The throttle valve 152 is provided at the eleventh interface 1512 of the manual reversing valve 151. The twelfth interface 1513 is selectively connected to the tenth interface 1511 or the eleventh interface 1512.

[0068] Specifically, when the manual reversing valve 151 is in the left position, the twelfth interface 1513 is connected to the tenth interface 1511, and the working medium passes through the sixth interface 1323, the tenth interface 1511, the twelfth interface 1513 and the second rodless chamber 1422 in sequence. At this time, the movement speed of the second driving member 142 can be adjusted by controlling the opening of the handle assembly 170; when the manual reversing valve 151 is in the right position, the twelfth interface 1513 is connected to the eleventh interface 1512, and the working medium passes through the sixth interface 1323, the throttle valve 152, the eleventh interface 1512, the twelfth interface 1513 and the second rodless chamber 1422 in sequence. Since this oil circuit is provided with a throttle valve 152, the throttle valve 152 plays a throttling role. Therefore, the low-speed working mode can be switched by turning the manual reversing valve 151 to the right position. In this way, the oil circuit of the second driving member 142 can be significantly reduced so that the second driving member 142 can complete real-time speed regulation at a lower pressure and flow rate, thereby meeting the requirements of precise positioning after the beam support device 210 moves to the vicinity of the working position.

[0069] Embodiment 5

[0070] like Figure 1As shown, the hydraulic system 100 also includes a shuttle valve 161, a handle assembly 170 and a pull valve 162. Specifically, the first multi-way valve 121 has a first pilot oil port 1213 (X port), and the second multi-way valve 122 has a second pilot oil port 1221 (X port). The shuttle valve 161 is connected to the first pilot oil port 1213, and the shuttle valve 161 is connected to the second pilot oil port 1221. By setting the shuttle valve 161, it can play a role in pressure selection, and preferentially selects a working medium with a higher pressure to pass through. Further, the handle assembly 170 is connected to the shuttle valve 161. Optionally, the handle assembly 170 includes a connected pilot handle 171 and a four-way handle 172. Among them, the pilot handle 171 is used to control the forward and backward movement of the left travel drive member; the pilot handle 171 is used to control the forward and backward movement of the right travel drive member; the pilot handle 171 is used to control the extension and retraction of the rear support drive member; the pilot handle 171 is used to control the descent and ascent of the shovel lifting drive member; the pilot handle 171 is used to control the forward and reverse rotation of the first motor; the pilot handle 171 is used to control the forward and reverse rotation of the star wheel motor. In addition, the four-way handle 172 is used to control the ascent and descent of the cutting head lifting drive member; the four-way handle 172 is used to control the left and right rotation of the cutting head rotary drive member. Further, the pull-out valve 162 is connected to the shuttle valve 161, the pull-out valve 162 is connected to the first hydraulically controlled reversing valve 131, the pull-out valve 162 is connected to the second hydraulically controlled reversing valve 132, and the pull-out valve 162 is connected to the third hydraulically controlled reversing valve 133. The pull-out valve 162 controls the opening and closing of the first oil circuit. After the pull-out valve 162 is switched to a working position, the first hydraulically controlled reversing valve 131 , the second hydraulically controlled reversing valve 132 , and the third hydraulically controlled reversing valve 133 can return to their original positions.

[0071] Furthermore, the hydraulic system 100 also includes a balancing valve 163. Specifically, the balancing valve 163 is connected to the second hydraulically controlled reversing valve 132, and the balancing valve 163 is connected to the first driving member 141; and / or the balancing valve 163 is connected to the third hydraulically controlled reversing valve 133, and the balancing valve 163 is connected to the second driving member 142. By setting the balancing valve 163, the flow resistance through the valve can be changed to achieve the purpose of regulating the flow. Normally, there is a large pressure difference or flow difference in various parts of the medium in the pipeline or container. The balancing valve 163 can reduce or balance the pressure difference, which is used to adjust the relative balance of pressure on both sides, or to achieve flow balance by diversion.

[0072] Embodiment 6

[0073] like Figure 1As shown, the pump station 112 includes at least two connected pump bodies, and the number of pump bodies is at least two, that is, the pump bodies can be two or more, and the pump bodies are flexibly arranged according to actual needs. At least one pump body is connected to the first multi-way valve 121, and the pump body is connected to the first hydraulic control reversing valve 131; at least one pump body is connected to the second multi-way valve 122. Optionally, the pump station 112 includes a first pump body 1121 and a second pump body 1122 connected. The first pump body 1121 has an oil outlet and a control oil port. The first multi-way valve 121 has an oil inlet 1211 and a load-sensitive oil port 1212. The oil outlet of the first pump body 1121 is connected to the oil inlet 1211 of the first multi-way valve 121. The load-sensitive oil port 1212 is connected to the first interface 1311. The second interface 1312 is connected to the control oil port of the first pump body 1121. When the first hydraulically controlled reversing valve 131 is in the first position, the first interface 1311 is connected to the second interface 1312, and the feedback oil circuit passes through the load-sensitive oil port 1212, the first interface 1311, the second interface 1312 and the control oil port in sequence. After the control oil port receives the working medium of the feedback oil circuit, the first pump body 1121 can pump the working medium in the hydraulic oil tank 111 to the first multi-way valve 121, and then the first multi-way valve 121 distributes the working medium to the left planetary gear motor, the right planetary gear motor or the first motor. In addition, the second pump body 1122 can pump the working medium in the hydraulic oil tank 111 to the second multi-way valve 122, and then the second multi-way valve 122 distributes it to each driving part.

[0074] Embodiment 7

[0075] like Figure 1 and Figure 2As shown, the hydraulic system 100 provided by the present invention can realize the interlocking of support and excavation operations. Specifically, when the beam support device 210 is prepared to perform support operations, the pilot oil source is sent to the pilot handle 171, the four-way handle 172 and the pull-out valve 162 in parallel after the pressure selection is performed by the shuttle valve 161 from the X port (pilot oil port) of the seven-way multi-way valve (the second multi-way multi-way valve 122) and the three-way multi-way valve (the first multi-way multi-way valve 121). By pulling the pull-out valve 162 with a positioning function, the control oil circuit of the hydraulically controlled reversing valve (including the first hydraulically controlled reversing valve 131, the second hydraulically controlled reversing valve 132 and the third hydraulically controlled reversing valve 133) can be connected to the X port of the multi-way valve and pressure is established, pushing the valve core to make the hydraulically controlled reversing valve reverse. Among them, the second hydraulically controlled reversing valve 132 and the third hydraulically controlled reversing valve 133 are switched to change the fourth A and B oil port connecting element of the seven-way valve (the second multi-way multi-way valve 122) from the cutting telescopic oil cylinder (the first driving member 141) to the beam support oil cylinder (the second driving member 142). At this time, the corresponding cutting telescopic pilot handle 171 is pushed, and the beam support oil cylinder starts to move to perform the support operation, and the cutting telescopic oil cylinder is maintained at the current stroke position under the action of the balance valve 163. At the same time, the first hydraulically controlled reversing valve 131 reverses the LS oil circuit of the triple multi-way valve, and changes the original feedback to the front pump (first pump body 1121) of the pump station 112 to return to the hydraulic oil tank 111. Because the plunger pump used in the hydraulic system 100 of the present invention is a load-sensitive pump, when there is no LS oil circuit feedback, the swash plate swing angle of the front pump is the minimum angle, and the front pump has no flow output. Therefore, when the pilot handle 171 of the star wheel and the first movement is pushed, the star wheel and the first movement do not move, that is, the star wheel and the first movement motor are locked when the beam support device 210 is working.

[0076] The present invention realizes real-time adjustment of the speed of the beam supporter 210 to meet different working conditions by adding a speed regulating valve group 150 to the oil circuit of the rodless chamber (the second rodless chamber 1422) of the beam supporter oil cylinder. When the oil circuit of the second rodless chamber 1422 is fed with oil, the high-pressure oil is sent out by the pump station 112, enters the second hydraulic control reversing valve 132 and the balance valve 163 through the fourth joint of the seven-joint multi-way valve, and then enters the speed regulating valve group 150. When the manual reversing valve 151 in the speed regulating valve group 150 is in the left position, the oil flows into the rodless chamber of the beam supporter oil cylinder through the manual reversing valve 151. Since the control mode of the pilot handle 171 adopted by the present system is proportional control, the movement speed of the beam supporter oil cylinder can be adjusted by adjusting the opening of the pilot handle 171. However, since the pressure and flow of the multi-way valve are pre-adjusted, the speed regulating range of the beam dragging oil cylinder has certain limitations, and cannot meet the precise positioning requirements of the beam supporter 210 after moving to the working position. The low-speed working mode can be switched to by turning the manual reversing valve 151 to the right position. At this time, the manual reversing valve 151 in the speed regulating valve group 150 is switched to the right position, and the oil flows into the rodless chamber of the beam support cylinder after being throttled by the throttle valve 152. In this way, the oil circuit of the beam support cylinder (second drive member 142) can be significantly reduced so that the beam support cylinder can be adjusted in real time under lower pressure and flow, thereby meeting the precise positioning of the beam support 210 after it moves to the vicinity of the working position.

[0077] In the technical solution defined in the present invention, on the one hand, it is possible to modify the existing hydraulic system 100 to achieve real-time speed regulation of the beam supporter 210, and interlock the support and excavation operations; on the other hand, the movement speed of the beam supporter 210 can be adjusted in real time without adjusting the flow and pressure of the multi-way valve, and the movement speed of the beam supporter 210 can be adjusted in real time in low-speed or high-speed mode; furthermore, when the beam supporter 210 performs support operations, the star wheel, the first movement, and the cutting and telescopic locking are locked, and the actuator has no action, thereby avoiding personal injury and equipment damage due to factors such as misoperation.

[0078] Embodiment 8

[0079] like Figure 3 As shown, an engineering machine 200 provided by one embodiment of the present invention includes the hydraulic system 100 and the beam support device 210 in any of the above embodiments. The beam support device 210 is connected to the second driving member 142 of the hydraulic system 100. Optionally, the engineering machine 200 further includes a cutting part, a star wheel motor and a first-transmission motor. The cutting part is connected to the first driving member 141; the star wheel motor is connected to the first multi-way valve 121; and the first-transmission motor is connected to the first multi-way valve 121.

[0080] It is worth noting that the engineering machinery 200 may be equipment such as a tunnel boring machine.

[0081] According to the embodiments of the hydraulic system and engineering machinery of the present invention, the driving member is driven by the hydraulic system. Compared with the human-driven or motor-driven methods, it has a simple structure, high sensitivity, and is easy to accurately position, and can also improve work efficiency and safety performance. The first driving member is used for excavation work, and the second driving member is used for support operations. A branch oil circuit is added to the hydraulic oil circuit of the first driving member to control the second driving member to achieve functional switching between excavation and support operations. When the second driving member is in a working state, the first driving member is in a locked state. In addition, by adding a first hydraulically controlled reversing valve, when supporting operations are achieved, the star wheel and the first-motor motor are in a locked state to avoid personal injury or equipment damage due to misoperation.

[0082] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0083] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0084] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0085] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hydraulic system, characterized in that: include: Hydraulic oil tank (111); A pump station (112) connected to the hydraulic oil tank (111); A first multi-way valve (121) connected to the pump station (112); A second multi-way valve (122) connected to the pump station (112); a first hydraulically controlled reversing valve (131) connected to the first multi-way valve (121); the first hydraulically controlled reversing valve (131) connected to the pump station (112); the first hydraulically controlled reversing valve (131) connected to the hydraulic oil tank (111); when the first hydraulically controlled reversing valve (131) is in a first working position, the first multi-way valve (121) is in communication with the pump station (112); when the first hydraulically controlled reversing valve (131) is in a second working position, the first multi-way valve (121) is in communication with the hydraulic oil tank (111); A second hydraulically controlled reversing valve (132) connected to the second multi-way valve (122); A third hydraulically controlled reversing valve (133) connected to the second multi-way valve (122); A first driving member (141) is connected to the second hydraulically controlled reversing valve (132), and the first driving member (141) is connected to the third hydraulically controlled reversing valve (133); when the second hydraulically controlled reversing valve (132) is in a first working position and the third hydraulically controlled reversing valve (133) is in the first working position, the first driving member (141) is in a working state; A second driving member (142) is connected to the third hydraulically controlled reversing valve (133), and the second driving member (142) is connected to the second hydraulically controlled reversing valve (132), and when the second hydraulically controlled reversing valve (132) is in the second working position and the third hydraulically controlled reversing valve (133) is in the second working position, the second driving member (142) is in a working state; The first driving member (141) is a first oil cylinder having a first rod chamber (1411) and a first rodless chamber (1412); the second driving member (142) is a second oil cylinder having a second rod chamber (1421) and a second rodless chamber (1422); The second hydraulically controlled reversing valve (132) has a fourth interface (1321), a fifth interface (1322) and a sixth interface (1323); the fourth interface (1321) is connected to the second multi-way valve (122); the fifth interface (1322) is connected to the first rodless cavity (1412); the sixth interface (1323) is connected to the second rodless cavity (1422); the fourth interface (1321) is selectively connected to the fifth interface (1322) or the sixth interface (1323); when the second hydraulically controlled reversing valve (132) is in the first working position, the fourth interface (1321) is connected to the fifth interface (1322); when the second hydraulically controlled reversing valve (132) is in the second working position, the fourth interface (1321) is connected to the sixth interface (1323); The third hydraulically controlled reversing valve (133) has a seventh interface (1331), an eighth interface (1332) and a ninth interface (1333); the seventh interface (1331) is connected to the second multi-way valve (122); the eighth interface (1332) is connected to the first rod chamber (1411); the ninth interface (1333) is connected to the second rod chamber (1421); the seventh interface (1331) is selectively connected to the eighth interface (1332) or the ninth interface (1333); when the third hydraulically controlled reversing valve (133) is in the first working position, the seventh interface (1331) is connected to the eighth interface (1332); when the third hydraulically controlled reversing valve (133) is in the second working position, the seventh interface (1331) is connected to the ninth interface (1333).

2. The hydraulic system according to claim 1, characterized in that: The first multi-way valve (121) has an oil inlet (1211) and a load-sensitive oil port (1212); the first hydraulically controlled reversing valve (131) has a first interface (1311), a second interface (1312) and a third interface (1313); the first interface (1311) is connected to the load-sensitive oil port (1212); the second interface (1312) is connected to the pump station (112); the third interface (1313) is connected to the hydraulic oil tank (111); the first interface (1311) is selectively connected to the second interface (1312) or the third interface (1313); when the first hydraulically controlled reversing valve (131) is in a first working position, the first interface (1311) is connected to the second interface (1312); when the first hydraulically controlled reversing valve (131) is in a second working position, the first interface (1311) is connected to the third interface (1313).

3. The hydraulic system according to claim 2, characterized in that: The sixth interface (1323) is connected to the second rodless chamber (1422) via a first fluid path (181), and the hydraulic system (100) further comprises: The speed regulating valve group (150) is arranged in the first fluid path (181).

4. The hydraulic system according to claim 3, characterized in that: The speed regulating valve group (150) comprises: A manual reversing valve (151), comprising a tenth interface (1511), an eleventh interface (1512) and a twelfth interface (1513), wherein the tenth interface (1511) is connected to the sixth interface (1323), the eleventh interface (1512) is connected to the sixth interface (1323), the twelfth interface (1513) is connected to the second rodless chamber (1422), and the twelfth interface (1513) is selectively connected to the tenth interface (1511) or the eleventh interface (1512); The throttle valve (152) is arranged at the eleventh interface (1512). When the twelfth interface (1513) is connected to the tenth interface (1511), the working medium passes through the sixth interface (1323), the tenth interface (1511), the twelfth interface (1513) and the second rodless cavity (1422) in sequence; when the twelfth interface (1513) is connected to the eleventh interface (1512), the working medium passes through the sixth interface (1323), the throttle valve (152), the eleventh interface (1512), the twelfth interface (1513) and the second rodless cavity (1422) in sequence.

5. The hydraulic system according to any one of claims 1 to 4, characterized in that: The first multi-way valve (121) has a first pilot oil port (1213), the second multi-way valve (122) has a second pilot oil port (1221), and the hydraulic system (100) further comprises: A shuttle valve (161) connected to the first pilot oil port (1213); the shuttle valve (161) connected to the second pilot oil port (1221); A handle assembly (170) connected to the shuttle valve (161); The pull-out valve (162) is connected to the shuttle valve (161), the pull-out valve (162) is connected to the first hydraulically controlled reversing valve (131), the pull-out valve (162) is connected to the second hydraulically controlled reversing valve (132), and the pull-out valve (162) is connected to the third hydraulically controlled reversing valve (133).

6. The hydraulic system according to any one of claims 1 to 4, characterized in that: Also includes: The balancing valve (163) is connected to the second hydraulically controlled reversing valve (132), and the balancing valve (163) is connected to the first driving member (141); and / or the balancing valve (163) is connected to the third hydraulically controlled reversing valve (133), and the balancing valve (163) is connected to the second driving member (142).

7. The hydraulic system according to claim 5, characterized in that: The handle assembly (170) comprises a pilot handle (171) and a four-way handle (172) which are connected to each other.

8. The hydraulic system according to any one of claims 1 to 4, characterized in that: The pump station (112) comprises at least two connected pump bodies, at least one of the pump bodies is connected to the first multi-way valve (121), and the pump body is connected to the first hydraulically controlled reversing valve (131); at least one of the pump bodies is connected to the second multi-way valve (122).

9. An engineering machine, characterized in that: include: A hydraulic system as claimed in any one of claims 1 to 8; The beam support device (210) is connected to the second driving member (142) of the hydraulic system.

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