A safe operation system and engineering machinery

Abstract

The invention discloses a safe operation system and engineering machinery. In the system, the first oil port of the reversing valve is connected to the inlet of the hydraulic pilot operation valve group, and the second oil port of the reversing valve is connected to the inlet of the remote control operation valve group; the reversing valve includes three selection positions, namely, a safety position, an onboard driver selection position and a remote control selection position; when the reversing valve is in the safety position, the first oil port and the second oil port are both connected to the oil tank through the reversing valve; when the reversing valve is in the onboard driver selection position, the first oil port is connected to the pilot oil source through the reversing valve, and the outlet of the hydraulic pilot operation valve group is connected to an actuator; when the reversing valve is in the remote control selection position, the connection between the first oil port and the pilot oil source is disconnected, the second oil port is connected to the pilot oil source through the reversing valve, the outlet of the remote control operation valve group is connected to the actuator, and the remote control operation function of the remote control is turned on, so that the remote control can control the remote control operation valve group. The safety of use can be ensured in the safe operation system.

Description

Technical Field

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

[0002] At present, most construction machinery is designed to be operated by hydraulic handles in the driver's cab. The hydraulic handles in the driver's cab have a good operating field of vision, a realistic environment, and a strong sense of operation. In addition, the hydraulic pilot handle components are more mature and reliable, low cost, and the operating handle has a large stroke and moderate sensitivity, so the machine has high operating efficiency.

[0003] However, this type of machine is mainly used in conventional engineering construction, without taking into account explosion-proof and strong radiation-proof dangerous environments and narrow spaces. If used in such dangerous environments, there will be great safety hazards for operators. At the same time, the machine does not have a non-operational safety protection position outside the operating function, and it is possible to touch the handle in the standby state to cause malfunction.

[0004] Therefore, how to improve the safety of equipment use is a technical problem that technicians in this field currently need to solve. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a safe operation system, which is safer to use. Another object of the present invention is to provide an engineering machine including the above-mentioned safe operation system, which is safer to use.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A safe operation system, comprising a controller, a remote controller, a reversing valve, a hydraulic pilot operated valve group, a remote controlled operated valve group and an actuator;

[0008] The hydraulic pilot operated valve group has a manually operated on-board handle;

[0009] The remote controller and the reversing valve are respectively communicatively connected to the controller;

[0010] The first oil port of the reversing valve is connected to the inlet of the hydraulic pilot operation valve group, and the second oil port of the reversing valve is connected to the inlet of the remote control operation valve group;

[0011] The reversing valve includes three selection positions: a safety position, an onboard driver selection position, and a remote control selection position. The controller can control the reversing valve to switch the working position.

[0012] When the reversing valve is in the safety position, the first oil port and the second oil port are both connected to the oil tank through the reversing valve;

[0013] When the reversing valve is in the driver selection position on the machine, the first oil port is connected to the pilot oil source through the reversing valve, and the outlet of the hydraulic pilot operating valve group is connected to the actuator;

[0014] When the reversing valve is in the remote control selection position, the first oil port is disconnected from the pilot oil source, the second oil port is connected to the pilot oil source through the reversing valve, the outlet of the remote control operation valve group is connected to the actuator, and the remote control operation function of the remote controller is turned on, so that the remote controller can control the remote control operation valve group.

[0015] Preferably, when the reversing valve is in the onboard driver selection position, the remote control function of the remote controller on the remote control valve group stops.

[0016] Preferably, the remote control valve group includes an OR logic shuttle group and an electric control valve group, and the electric control valve group is communicatively connected to the controller;

[0017] The OR logic shuttle group includes a logic shuttle outlet and a first OR logic valve inlet and a second OR logic valve inlet respectively connected to the logic shuttle outlet;

[0018] The logic shuttle outlet is connected to the actuator through the electrically controlled valve group;

[0019] The first or logic valve inlet is connected to the outlet of the hydraulic pilot operated valve group;

[0020] The second OR logic valve inlet is connected to the second oil port.

[0021] Preferably, it further comprises a driver's cab control panel, wherein the driver's cab control panel is communicatively connected to the controller;

[0022] When the reversing valve is switched to the onboard driver selection position, the driver operating mechanism on the driver's cab control panel can control the electronically controlled operating valve group.

[0023] Preferably, when the reversing valve is in the remote control selection position, the driver operating mechanism stops operating the electronically controlled operating valve group.

[0024] Preferably, the hydraulic pilot operated valve group includes a hydraulic pressure reducing valve.

[0025] Preferably, the electrically controlled operating valve group includes an electric proportional pressure reducing valve.

[0026] Preferably, the reversing valve is a three-position four-way electromagnetic reversing valve.

[0027] Preferably, the actuator comprises a hydraulically controlled reversing valve.

[0028] An engineering machine comprises a driver's cab and the above-mentioned safe operation system, wherein the on-machine handle is arranged in the driver's cab.

[0029] The safety operation system provided by the present invention comprises a controller, a remote controller, a reversing valve, a hydraulic pilot operating valve group, a remote control operating valve group and an actuator; the hydraulic pilot operating valve group has an onboard handle for manual operation; the remote controller and the reversing valve are respectively connected to the controller by communication; the first oil port of the reversing valve is connected to the inlet of the hydraulic pilot operating valve group, and the second oil port of the reversing valve is connected to the inlet of the remote control operating valve group; the reversing valve comprises three selection positions, namely, a safety position, an onboard driver selection position and a remote control selection position, and the controller can control the reversing valve to switch its working position; when the reversing valve is in the safety position, the first oil port and the second oil port are both connected to the oil tank through the reversing valve; when the reversing valve is in the onboard driver selection position, the first oil port is connected to the pilot oil source through the reversing valve, and the outlet of the hydraulic pilot operating valve group is connected to the actuator; when the reversing valve is in the remote control selection position, the connection between the first oil port and the pilot oil source is disconnected, the second oil port is connected to the pilot oil source through the reversing valve, the outlet of the remote control operating valve group is connected to the actuator, and the remote control operation function of the remote controller is turned on, so that the remote controller can control the remote control operating valve group.

[0030] In this safe operation system, the reversing valve has three working positions. When the reversing valve is switched to the onboard driver selection position, the hydraulic pilot operating valve group can be manually controlled to control the oil supply to the actuator. When the reversing valve is switched to the remote control selection position, the hydraulic pilot operating valve group is disconnected from the pilot oil source and the remote control operating valve group is connected to the pilot oil source. The controller controls the remote control to start the remote control operation function, and the remote control can be used to control the oil supply of the remote control operating valve group to the actuator, thereby realizing dual control of the actuator by onboard manual control and remote control. At the same time, when the reversing valve is switched to the safety position, the connection between the hydraulic pilot operating valve group and the remote control operating valve group and the pilot oil source can be disconnected to prevent misoperation and ensure safety of use.

[0031] The engineering machinery provided by the present invention and including the above-mentioned safe operation system has high safety in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0033] Figure 1 This is the oil circuit diagram of the safe operation system provided by the present invention.

[0034] Figure 2 The electrical control diagram of the safety operation system provided by the present invention

[0035] Reference numerals:

[0036] Hydraulic pilot mechanism 1, reversing valve 11, hydraulic pilot operating valve group 12, hydraulic pressure reducing valve 121, or logic shuttle valve group 13, or logic valve 131, electric control operating valve group 14, electric proportional pressure reducing valve 141, pilot oil source 15;

[0037] Actuator 2, main oil source 21, hydraulically controlled reversing valve 22;

[0038] Controller 3;

[0039] Remote control 4;

[0040] The onboard driver selects position A, the remote control selects position B, and the safety position C;

[0041] The first oil port is Pra, the second oil port is Prb;

[0042] The first OR logic valve inlet is d, the second OR logic valve inlet is e, and the logic shuttle outlet is f. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] The core of the present invention is to provide a safe operation system, which is highly safe to use. Another core of the present invention is to provide an engineering machine including the above-mentioned safe operation system, which is highly safe to use.

[0045] For a specific embodiment of the safe operation system provided by the present invention, please refer to Figure 1 and Figure 2 , including a controller 3, a remote controller 4, a hydraulic pilot mechanism 1 and an actuator 2. The hydraulic pilot mechanism 1 includes a reversing valve 11, a hydraulic pilot operating valve group 12, and a remote control operating valve group.

[0046] The remote controller 4 and the reversing valve 11 are respectively connected to the controller 3. Specifically, in the hydraulic pilot mechanism 1, the electromagnets of all components are electrically connected to the output ports of the controller 3, the input ports of the controller 3 are connected to the corresponding electrical parts of the operating end, and the controller 3 is programmed with the corresponding control software program.

[0047] The hydraulic pilot operated valve group 12 has a manually operated onboard handle. The onboard handle is located in the driver's cab so that the operator can manually operate the valve in the driver's cab. The control of the hydraulic pilot operated valve group 12 and the remote control operated valve group specifically includes on-off control and opening control.

[0048] The first oil port Pra of the reversing valve 11 is connected to the inlet of the hydraulic pilot operating valve group 12 , and the second oil port Prb of the reversing valve 11 is connected to the inlet of the remote control operating valve group. The oil inlet of the reversing valve 11 is connected to the pilot oil source 15 .

[0049] The reversing valve 11 includes three selection positions: a safety position C, an onboard driver selection position A, and a remote control selection position B. The controller 3 can control the reversing valve 11 to switch its working position;

[0050] When the reversing valve 11 is in the safety position C, the first oil port Pra and the second oil port Prb are both connected to the oil tank through the reversing valve 11. That is to say, the hydraulic pilot operating valve group 12 and the remote control operating valve group are both connected to the oil tank to release pressure but not connected to the oil source. At this time, even if the hydraulic pilot operating valve group 12, the remote control operating valve group or the remote controller 4 is operated by mistake, the oil will not enter the hydraulic pilot operating valve group 12 and the remote control operating valve group, and the actuator 2 will not be further controlled through the hydraulic pilot operating valve group 12 and the remote control operating valve group, which can ensure the safety of use. In standby mode, the reversing valve 11 is in the safety position C by default.

[0051] When the reversing valve 11 is in the state of the onboard driver selection position A, the first oil port Pra is connected to the pilot oil source 15 through the reversing valve 11, and the outlet of the hydraulic pilot operating valve group 12 is connected to the actuator 2. In this state, the oil of the pilot oil source 15 flows to the hydraulic pilot operating valve group 12 through the reversing valve 11, and the oil can further flow to the actuator 2 by manually controlling the on-off and opening of the hydraulic pilot operating valve group 12.

[0052] When the reversing valve 11 is in the remote control selection position B, the first oil port Pra is disconnected from the pilot oil source 15, the second oil port Prb is connected to the pilot oil source 15 through the reversing valve 11, the outlet of the remote control valve group is connected to the actuator 2, and the oil of the pilot oil source 15 can flow to the remote control valve group through the reversing valve 11. At the same time, the remote control function of the remote controller 4 is turned on, which is specifically realized by the program setting in the controller 3, so that the remote controller 4 can control the remote control valve group. Specifically, the on-off and opening of the remote control valve group can be controlled by operating the remote controller 4, so that the oil can further flow to the actuator 2.

[0053] It can be seen that in the safe operation system, the reversing valve 11 has three working positions. When the reversing valve 11 is switched to the onboard driver selection position A, the hydraulic pilot operating valve group 12 can be manually controlled to control the oil supply to the actuator 2. When the reversing valve 11 is switched to the remote control selection position B, the hydraulic pilot operating valve group 12 is disconnected from the pilot oil source 15 and the remote control operating valve group is connected to the pilot oil source 15. The controller 3 controls the remote controller 4 to start the remote control operation function. The remote control 4 can be used to control the oil supply of the remote control operating valve group to the actuator 2, thereby realizing dual control of the onboard manual control and remote control control of the actuator 2. At the same time, when the reversing valve 11 is switched to the safety position C, the connection between the hydraulic pilot operating valve group 12 and the remote control operating valve group and the pilot oil source 15 can be disconnected to prevent misoperation and ensure the safety of use.

[0054] Furthermore, when the reversing valve 11 is in the state of the onboard driver selection position A, the remote control operation function of the remote control 4 on the remote control valve group is stopped, which is specifically realized by the program setting in the controller 3. At this time, even if the operating structure such as the handle on the remote control 4 is pressed, the remote control valve group will not operate. In other words, through the dual protection of the oil circuit interlock protection of the reversing valve 11 and the circuit control protection of the controller 3, in addition to ensuring that the hydraulic pilot operation valve group 12 is not connected to the oil circuit when the remote control 4 is enabled, it can also ensure that the remote control 4 does not work when the hydraulic pilot operation valve group 12 is connected to the oil circuit, further ensuring the safety of use.

[0055] Further, the remote control valve group includes a logic shuttle group 13 and an electric control valve group 14, and the electric control valve group 14 is communicatively connected to the controller 3. The logic shuttle group 13 includes a logic shuttle outlet f and a first logic valve inlet d and a second logic valve inlet e respectively connected to the logic shuttle outlet f. The logic shuttle outlet f is connected to the actuator 2 through the electric control valve group 14. The first logic valve inlet d is connected to the outlet of the hydraulic pilot operation valve group 12. The second logic valve inlet e is connected to the second oil port Prb.

[0056] Specifically, the reversing valve 11 is a three-position four-way electromagnetic reversing valve. Specifically, among the three working positions of the reversing valve 11, Figure 1 As shown, when power is not available, it is in the middle position, which is the safety position C. When power is available, it is in the left or right position. The left position is the driver selection position A on the machine, and the right position is the remote control selection position B. The oil inlet Pr of the reversing valve 11 is connected to the pilot oil source 15, and the oil return port Tr is connected to the oil tank. The first oil port Pra is connected to the pilot pressure oil common oil channel Prh of the hydraulic pilot operating valve group 12, and the second oil port Prb is connected to the pilot pressure oil common oil channel Pre of the logic shuttle group 13. When the reversing valve 11 is in the middle position, the first oil port Pra and the second oil port Prb are connected to the oil tank for pressure relief.

[0057] The hydraulic pilot operating valve group 12 includes at least one hydraulic pressure reducing valve 121. The pressure oil inlets of all hydraulic pressure reducing valves 121 are connected to the pilot pressure oil common oil passage Prh, and the oil return ports of all hydraulic pressure reducing valves 121 are connected to the pilot common oil return passage Trh, which is connected to the oil tank.

[0058] The OR logic shuttle group 13 includes at least one OR logic shuttle valve 131. One signal inlet of all OR logic shuttle valves 131 is connected to the pilot pressure oil common oil passage Pre, and the other signal inlet is connected to the outlet of the hydraulic pressure reducing valve 121 respectively.

[0059] The electric control operation valve group 14 includes at least one electric proportional pressure reducing valve 141. All the electric proportional pressure reducing valve inlets correspond to the signal outlets of the direct or logic shuttle group 13, and the oil return ports of all the electric proportional pressure reducing valves are directly connected to the common oil return channel Tre, which is connected to the oil tank.

[0060] The actuator 2 includes at least one hydraulically controlled reversing valve 22, which can be a two-position hydraulically controlled reversing valve 22 and a three-position hydraulically controlled reversing valve 22. The pilot control port of the hydraulically controlled reversing valve 22 is directly connected to the outlet of the electric proportional pressure reducing valve 141 in sequence, the oil inlet of the hydraulically controlled reversing valve 22 is connected to the public pressure oil channel P connected to the main oil source 21, and the oil return port of the hydraulically controlled reversing valve 22 is connected to the public oil return channel T.

[0061] In this embodiment, no matter the reversing valve 11 is in the onboard driver selection position A or the remote control selection position B, the electrically controlled operating valve group 14 is always connected to the oil circuit: when it is in the onboard driver selection position A, the oil flowing out of the reversing valve 11 enters the hydraulic pilot operating valve group 12, and then can enter the OR logic shuttle group 13 through the first OR logic valve inlet d of the OR logic shuttle group 13, and then enter the electrically controlled operating valve group 14, and then enter the actuator 2 through the electrically controlled operating valve group 14; when it is in the remote control selection position B, the oil flowing out of the reversing valve 11 does not enter the hydraulic pilot operating valve group 12, but directly enters the OR logic shuttle group 13 through the second OR logic valve inlet e of the OR logic shuttle group 13, and then enters the electrically controlled operating valve group 14, and then enters the actuator 2 through the electrically controlled operating valve group 14.

[0062] Based on this setting, when the reversing valve 11 is in the driver selection position A on the machine, in addition to manually controlling the hydraulic pilot operating valve group 12 on the machine, the oil flow in the oil circuit can also be controlled by the electrical signal control of the electronically controlled operating valve group 14, thereby improving the timeliness and flexibility of the oil control in the oil circuit.

[0063] Furthermore, the safety operation system also includes a cab control panel, which is communicatively connected to the controller 3. When applied to an engineering machine, the cab control panel is arranged in the cab. When the reversing valve 11 is switched to the onboard driver selection position A, the driver operating mechanism on the cab control panel can control the electronically controlled valve group 14. At this time, the staff can control the on-off, opening, etc. of the electronically controlled valve group 14 by operating the driver operating mechanism. Specifically, the driver operating mechanism can be a structure such as a button or a knob.

[0064] Furthermore, when the reversing valve 11 is in the remote control selection position B, the driver operating mechanism stops operating the electronically controlled valve group 14, that is, the driver operating mechanism cannot control the electronically controlled valve group 14 to move, thereby avoiding the control of the electronically controlled valve group 14 by the driver operating mechanism when the reversing valve 11 is switched to the remote control selection position B, thereby further ensuring the interlocking effect.

[0065] The working process of the safe operation system in this embodiment includes:

[0066] A: After the machine is started, the safety switch is not turned on, the three-in-one switch is in the middle position, the reversing valve 11 and the electric proportional pressure reducing valve 141 in the hydraulic pilot mechanism 1 are not energized, and the electric control of the remote control 4 does not work. The reversing valve 11 is in the middle position, that is, the safety position C, the pilot oil source 15 is disconnected, and the pilot pressure oil common oil channel Prh of the hydraulic pilot operating valve group 12 and the pilot pressure oil common oil channel Pre of the logic shuttle group 13 are directly connected to the oil tank through the middle position of the reversing valve 11. Therefore, no matter whether the hydraulic pilot operating valve group 12 or the electric proportional pressure reducing valve is operated incorrectly, there is no pilot oil output, the hydraulically controlled reversing valve 22 in the actuator 2 is not pushed to change direction, and the mechanical mechanism is in a safe state without action.

[0067] B: When operating, if you choose to perform conventional local operation in the driver's cab, turn on the safety switch and let the three-choice switch be in the conventional local operation position in the driver's cab. The electromagnet of the on-board driver selection position A corresponding to the reversing valve 11 is energized, and the reversing valve 11 is switched to enter the on-board driver selection position A. At the same time, the electromagnet of the electric proportional pressure reducing valve 141 is energized, and the pilot pressure oil source pushes the corresponding actuator 2's hydraulically controlled reversing valve 22 to switch direction through the reversing valve 11, the pilot pressure oil common oil channel Prh, the corresponding hydraulic pilot operating valve group 12, the corresponding or logic shuttle group 13, and the corresponding electric proportional pressure reducing valve 141, and the corresponding mechanical mechanism works. The speed of the action is generally controlled by the opening of the hydraulic pilot operating valve group 12. The larger the opening, the higher the output pilot pressure oil pressure, and the corresponding hydraulically controlled reversing valve 22 has a large switching output flow, so the action is fast. Since the pilot pressure oil for conventional local operation in the machine cab must be output through the connected electric proportional pressure reducing valve 141, the mechanical mechanism speed threshold control and safety protection pilot oil cut-off control can be performed by changing the current of the electric proportional pressure reducing valve 141. Under conventional local operation in the machine cab, the pilot pressure oil is controlled by the conventional local operation of the cab and the remote control electric control does not work. Under double protection, the occurrence of remote control operation of the mechanical mechanism is eliminated.

[0068] C: If remote control operation is selected, turn on the safety switch and place the three-choice switch in the remote control operation position. The electromagnet of the remote control selection position B corresponding to the reversing valve 11 is energized and switches to the remote control selection position B. The handle on the corresponding remote controller 4 is operated, and the corresponding electric proportional pressure reducing valve 141 is energized. The pilot pressure oil source pushes the hydraulically controlled reversing valve 22 of the corresponding actuator 2 to switch through the reversing valve 11, or the pilot pressure oil common oil channel Pre of the logic shuttle group 13, the corresponding or the logic shuttle group 13, and the corresponding electric proportional pressure reducing valve 141. The corresponding mechanical mechanism works, and the speed of the action is generally controlled by the opening of the electric proportional pressure reducing valve 141 controlled by the remote control operating handle. The larger the movement of the remote control operating handle, the larger the current passing through the electromagnet of the electric proportional pressure reducing valve 141 and the higher the output pilot pressure oil pressure, then the corresponding actuator 2 has a large switching output flow and thus a fast action.

[0069] The safe operation system in this embodiment has a three-position oil circuit interlock safety protection function. After the machine is started, the default non-operating position is the safety position C to prevent the machine mechanism from malfunctioning. When performing operating operations, you can choose conventional local operation in the machine driver's cab or remote control operation. When conventional local operation is selected, the reversing valve 11 is in the driver selection position A on the machine, which not only provides the operator with a good field of vision, a strong sense of operation, and high operating efficiency, but also allows the operator to utilize the protection devices and parameters under remote control operation, such as auxiliary input signal elements such as sensors and cameras, to solve the operating condition requirements of conventional local operation that must limit speed and position due to narrow working space, and prevent or reduce operator maloperation and fatigue and tension; when in a special dangerous working environment, remote control operation is selected, the reversing valve 11 is in the remote control selection position B, and the operator can perform remote operation. The selection of these functions is achieved by switching the pilot hydraulic oil circuit and performing physical interlocking of the oil circuit to prevent safety accidents caused by the simultaneous effectiveness of the functions.

[0070] Of course, in other embodiments, the logic shuttle group 13 may not be set, and the inlets of the hydraulic pilot operation valve group 12 and the remote control operation valve group are directly connected to the first oil port Pra and the second oil port Prb of the reversing valve 11, respectively, and the outlets are directly connected to the actuator 2.

[0071] In addition to the above-mentioned safe operation system, the present invention also provides an engineering machinery, which includes a driver's cab and a safe operation system, which can be specifically the safe operation system provided in any of the above embodiments, and the beneficial effects can be referred to the above embodiments accordingly. The on-board handle is arranged in the driver's cab. Please refer to the prior art for the structure of other parts of the engineering machinery, which will not be described in detail herein.

[0072] It should be noted that when an element is said to be "fixed" to another element, it may be directly on the other element or there may be an intermediate element. When an element is said to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0073] The terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the 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 element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0074] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0075] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0076] The above is a detailed introduction to the safe operation system and engineering machinery provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A safe operation system, characterized in that: It comprises a controller (3), a remote controller (4), a reversing valve (11), a hydraulic pilot operated valve group (12), a remote controlled operated valve group and an actuator (2); The hydraulic pilot operated valve group (12) has an onboard handle for manual operation; The remote controller (4) and the reversing valve (11) are respectively communicatively connected to the controller (3); The first oil port (Pra) of the reversing valve (11) is connected to the inlet of the hydraulic pilot operating valve group (12), and the second oil port (Prb) of the reversing valve (11) is connected to the inlet of the remote control operating valve group; The reversing valve (11) comprises three working positions, namely a safety position (C), an onboard driver selection position (A) and a remote control selection position (B), and the controller (3) is capable of controlling the reversing valve (11) to switch the working position thereof; When the reversing valve (11) is in the safety position (C), the first oil port (Pra) and the second oil port (Prb) are both connected to the oil tank through the reversing valve (11); When the reversing valve (11) is in the onboard driver selection position (A), the first oil port (Pra) is connected to the pilot oil source (15) through the reversing valve (11), and the outlet of the hydraulic pilot operating valve group (12) is connected to the actuator (2); When the reversing valve (11) is in the remote control selection position (B), the first oil port (Pra) is disconnected from the pilot oil source (15), the second oil port (Prb) is connected to the pilot oil source (15) through the reversing valve (11), the outlet of the remote control valve group is connected to the actuator (2), and the remote control function of the remote controller (4) is turned on, so that the remote controller (4) can control the remote control valve group.

2. The safe operation system according to claim 1, characterized in that: When the reversing valve (11) is in the onboard driver selection position (A), the remote control (4) stops the remote control operation function of the remote control valve group.

3. The safe operation system according to claim 1 or 2, characterized in that: The remote control valve group comprises an OR logic shuttle group (13) and an electric control valve group (14), and the electric control valve group (14) is communicatively connected to the controller (3); The OR logic shuttle group (13) comprises a logic shuttle outlet (f) and a first OR logic valve inlet (d) and a second OR logic valve inlet (e) respectively connected to the logic shuttle outlet (f); The logic shuttle outlet (f) is connected to the actuator (2) via the electrically controlled operating valve group (14); The first or logic valve inlet (d) is connected to the outlet of the hydraulic pilot operated valve group (12); The second logic valve inlet (e) is connected to the second oil port (Prb).

4. The safe operation system according to claim 3, characterized in that: It also includes a driver's cab control panel, the driver's cab control panel is communicatively connected to the controller (3); When the reversing valve (11) is switched to the onboard driver selection position (A), the driver operating mechanism on the driver's cab control panel can control the electrically controlled operating valve group (14).

5. The safe operation system according to claim 4, characterized in that: When the reversing valve (11) is in the remote control selection position (B), the driver operating mechanism stops operating the electronically controlled operating valve group (14).

6. The safe operation system according to claim 3, characterized in that: The hydraulic pilot operated valve group (12) comprises a hydraulic pressure reducing valve (121).

7. The safe operation system according to claim 3, characterized in that: The electrically controlled operating valve group (14) comprises an electric proportional pressure reducing valve (141).

8. The safe operation system according to claim 3, characterized in that: The reversing valve (11) is a three-position four-way electromagnetic reversing valve.

9. The safe operation system according to claim 3, characterized in that: The actuator (2) comprises a hydraulically controlled reversing valve (22).

10. An engineering machine, comprising a driver's cab, characterized in that: It also includes the safe operation system according to any one of claims 1 to 9, wherein the on-machine handle is arranged in the driver's cab.

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