Multi-way valve and torque integrated control system with micro-switches

Abstract

This invention belongs to the field of hydraulic control, specifically relating to a multi-way valve with microswitches and an integrated torque control system. The multi-way valve includes a first inlet link, a telescopic control link, a luffing control link, and a hoisting control link. The telescopic control link includes a telescopic directional valve, with a telescopic link microswitch mounted on its end cap. A push rod movably mounted on the telescopic directional valve is configured to control the opening and closing of the telescopic link microswitch. The luffing control link includes a luffing directional valve, with a luffing link microswitch mounted on its end cap. A push rod movably mounted on the luffing directional valve is configured to control the opening and closing of the luffing link microswitch. Microswitches are installed on the end caps of the telescopic control link, luffing control link, and hoisting control link of the multi-way valve. The movement of the valve cores in each link drives the push rods to open and close the microswitches. The torque system determines whether the torque limiting recognition function needs to be activated based on the open / closed state of the microswitches.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic control, specifically relating to a multi-way valve with micro-switches and an integrated torque control system. Background Technology

[0002] For safety reasons, torque limiting functionality is required when the boom extension, luffing, and hoisting operations of the straight boom truck-mounted crane's merging system are performed. One solution, adding multiple electromagnetic unloading valves to achieve torque limiting, suffers from poor integration and low versatility. Conversely, a solution integrating multi-way valves with position detection sensors is complex, uneconomical, and requires cumbersome maintenance. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a multi-way valve and torque integrated control system with micro switches. Micro switches are installed on the end caps of the telescopic control link, the amplitude control link, and the hoisting control link of the multi-way valve. The micro switches are opened and closed by the movement of the valve cores of each link driving the valve core push rod. The torque system determines whether the torque limit recognition function needs to be activated based on the opening and closing status of the micro switches.

[0004] The present invention is achieved through the following technical solution: a multi-way valve with a micro switch, the multi-way valve including a first oil inlet link, a telescopic control link, a luffing control link and a hoisting control link;

[0005] The telescopic control linkage includes a telescopic reversing valve. The first oil inlet of the multi-way valve is unidirectionally connected to the oil inlet of the telescopic reversing valve. A telescopic linkage micro switch is provided on the end cover of the telescopic reversing valve. The telescopic linkage valve core push rod, which is movably mounted on the telescopic reversing valve, is configured to control the opening and closing of the telescopic linkage micro switch.

[0006] The luffing control linkage includes a luffing reversing valve. The first oil inlet of the multi-way valve is unidirectionally connected to the oil inlet of the luffing reversing valve. A luffing linkage micro switch is provided on the end cover of the luffing reversing valve. The luffing linkage valve core push rod, which is movably mounted on the luffing reversing valve, is configured to control the opening and closing of the luffing linkage micro switch.

[0007] The winch control linkage includes a winch reversing valve. The first oil inlet of the multi-way valve is connected to the oil inlet of the winch reversing valve. The telescopic reversing valve and the luffing reversing valve are both arranged in the oil line between the first oil inlet of the multi-way valve and the oil inlet of the winch reversing valve. The telescopic reversing valve and the luffing reversing valve work together to control the unidirectional flow from the first oil inlet of the multi-way valve to the oil inlet of the winch reversing valve. A winch linkage micro switch is provided on the end cover of the winch reversing valve. The winch linkage valve core push rod movably arranged on the winch reversing valve is configured to control the opening and closing of the winch linkage micro switch.

[0008] The first oil inlet connector is located between the first oil inlet port and the return port of the multi-way valve, and is configured to control the oil flow between the first oil inlet port and the return port of the multi-way valve.

[0009] In some embodiments, the first oil inlet valve includes a solenoid directional valve and a first relief valve. The oil inlet of the first relief valve is connected to the first oil inlet of the multi-way valve. The pilot chamber of the first relief valve is connected to the oil inlet of the solenoid directional valve and is unidirectionally connected from the pilot chamber of the first relief valve to the oil inlet of the solenoid directional valve. The oil outlet of the first relief valve and the oil outlet of the solenoid directional valve are both connected to the return port of the multi-way valve.

[0010] The electromagnetic directional valve includes a first position and a second position. When the electromagnetic directional valve is in the first position, the oil inlet of the electromagnetic directional valve is connected to the oil return port of the multi-way valve. At this time, the oil inlet of the first relief valve is connected to the oil outlet of the first relief valve, and the first oil inlet of the multi-way valve forms an unloading oil circuit through the first relief valve to the oil return port of the multi-way valve. When the electromagnetic directional valve is in the second position, the oil inlet of the electromagnetic directional valve is disconnected from the oil outlet of the electromagnetic directional valve.

[0011] In some embodiments, the multi-way valve further includes a rotary control link and a second oil inlet link;

[0012] The rotary control linkage includes a rotary control valve, with the second oil inlet of the multi-way valve unidirectionally connected to the oil inlet of the rotary control valve;

[0013] The second oil inlet connector is located between the second oil inlet of the multi-way valve and the oil return port of the multi-way valve. The second oil inlet connector is configured to control the oil flow between the second oil inlet of the multi-way valve and the oil return port of the multi-way valve.

[0014] In some embodiments, the first oil inlet valve includes a solenoid directional valve and a first relief valve. The oil inlet of the first relief valve is connected to the first oil inlet of the multi-way valve. The pilot chamber of the first relief valve is connected to the oil inlet of the solenoid directional valve and is unidirectionally connected from the pilot chamber of the first relief valve to the oil inlet of the solenoid directional valve. The oil outlet of the first relief valve and the oil outlet of the solenoid directional valve are both connected to the return port of the multi-way valve.

[0015] The second oil inlet assembly includes a second relief valve, the oil inlet of the second relief valve is connected to the second oil inlet of the multi-way valve, the pilot chamber of the second relief valve is connected to the oil inlet of the solenoid directional valve and is unidirectionally guided from the pilot chamber of the second relief valve to the oil inlet of the solenoid directional valve, and the oil outlet of the second relief valve is connected to the return port of the multi-way valve.

[0016] The electromagnetic directional valve includes a first position and a second position. When the electromagnetic directional valve is in the first position, its inlet is connected to the return port of the multi-way valve. At this time, the inlet and outlet of the first relief valve are connected, and the inlet and outlet of the second relief valve are connected. The first inlet of the multi-way valve forms an unloading oil path through the first relief valve to the return port of the multi-way valve. The second inlet of the multi-way valve forms an unloading oil path through the second relief valve and the electromagnetic directional valve to the return port of the multi-way valve. When the electromagnetic directional valve is in the second position, its inlet and outlet are disconnected.

[0017] In some embodiments, the multi-way valve further includes a return line, which includes a fifth check valve and a third relief valve;

[0018] The oil inlet of the fifth check valve is connected to the second oil inlet of the multi-way valve, the oil outlet of the fifth check valve is connected to the oil inlet of the hoist reversing valve, and the rotary control valve is set in the oil line between the oil inlet of the fifth check valve and the second oil inlet of the multi-way valve and the rotary control valve is configured to control the on / off state of the second oil inlet of the multi-way valve and the oil inlet of the fifth check valve.

[0019] The oil inlet of the third overflow valve is connected to the oil line between the oil inlet of the fifth check valve and the second oil inlet of the multi-way valve, and the oil outlet of the third overflow valve is connected to the oil return port of the multi-way valve.

[0020] In some embodiments, the telescopic valve core push rod, the luffing valve core push rod, and the hoisting valve core push rod all include a grooved surface and a non-grooved surface;

[0021] When the roller of the telescopic micro switch contacts the non-grooved surface of the telescopic valve core push rod, the telescopic micro switch is opened; when the roller of the telescopic micro switch contacts the grooved surface of the telescopic valve core push rod, the telescopic micro switch is closed.

[0022] When the roller of the amplitude-changing micro switch contacts the non-grooved surface of the amplitude-changing valve core push rod, the amplitude-changing micro switch is opened; when the roller of the amplitude-changing micro switch contacts the grooved surface of the amplitude-changing valve core push rod, the amplitude-changing micro switch is closed.

[0023] When the roller of the winch-connected micro switch contacts the non-grooved surface of the winch-connected valve core push rod, the winch-connected micro switch is turned on; when the roller of the winch-connected micro switch contacts the grooved surface of the winch-connected valve core push rod, the winch-connected micro switch is turned off.

[0024] In some embodiments, the telescopic directional valve includes an upper position, a middle position, and a lower position; when the telescopic directional valve is in the middle position, its inlet, first working port, second working port, and return port are all disconnected, and the middle oil circuit is open; when the telescopic directional valve is in the upper position, its inlet and first working ports are connected, and its second working port and return port are connected. The central oil circuit of the telescopic directional valve is disconnected; the telescopic directional valve is in the lower position, the oil inlet of the telescopic directional valve is connected to the second working oil port of the telescopic directional valve, the first working oil port of the telescopic directional valve is connected to the return oil port of the telescopic directional valve, and the central oil circuit of the telescopic directional valve is disconnected; the first working oil port of the telescopic directional valve is connected to the A1 oil port of the multi-way valve, the second working oil port of the telescopic directional valve is connected to the B1 oil port of the multi-way valve, and the return oil port of the telescopic directional valve is connected to the return oil port of the multi-way valve.

[0025] The luffing directional valve includes upper, middle, and lower positions. In the middle position, the luffing directional valve's inlet, first working port, second working port, and return port are all disconnected, while the middle oil circuit is open. In the upper position, the luffing directional valve's inlet and first working port are connected, and its second working port and return port are connected. The intermediate oil circuit of the valve is disconnected; the luffing directional valve is in the lower position, the oil inlet of the luffing directional valve is connected to the second working oil port of the luffing directional valve, the first working oil port of the luffing directional valve is connected to the return oil port of the luffing directional valve, and the intermediate oil circuit of the luffing directional valve is disconnected; the first working oil port of the luffing directional valve is connected to the A2 oil port of the multi-way valve, the second working oil port of the luffing directional valve is connected to the B2 oil port of the multi-way valve, and the return oil port of the luffing directional valve is connected to the return oil port of the multi-way valve.

[0026] The winch directional valve includes upper, middle, and lower positions. In the middle position, both the first and second working ports of the winch directional valve are connected to the return port, and the middle oil circuit of the winch directional valve is open. In the upper position, the inlet port of the winch directional valve is connected to the first working port, and the second working port is connected to the return port, and the middle oil circuit of the winch directional valve is open. The oil circuit is disconnected; the winch directional valve is in the lower position, the oil inlet of the winch directional valve is connected to the second working oil port of the winch directional valve, the first working oil port of the winch directional valve is connected to the return oil port of the winch directional valve, and the middle oil circuit of the winch directional valve is disconnected; the first working oil port of the winch directional valve is connected to the A3 oil port of the multi-way valve, the second working oil port of the winch directional valve is connected to the B3 oil port of the multi-way valve, and the return oil port of the winch directional valve is connected to the return oil port of the multi-way valve.

[0027] The central oil circuit of the telescopic directional valve, the central oil circuit of the luffing directional valve, and the central oil circuit of the winch directional valve are all located on the oil circuit between the first oil inlet of the multi-way valve and the oil return port of the multi-way valve. The central oil circuit of the telescopic directional valve and the central oil circuit of the luffing directional valve are both in a conductive state, and the first oil inlet of the multi-way valve is connected to the oil inlet of the winch directional valve.

[0028] The present invention also provides a torque integrated control system, including the aforementioned multi-way valve with a micro switch. The first oil inlet of the multi-way valve is connected to the oil supply system, and the oil return port of the multi-way valve is connected to the oil tank. The A1 oil port of the multi-way valve is connected to the rod chamber of the telescopic cylinder, and the B1 oil port of the multi-way valve is connected to the rodless chamber of the telescopic cylinder. The A2 oil port of the multi-way valve is connected to the rod chamber of the luffing cylinder, and the B2 oil port of the multi-way valve is connected to the rodless chamber of the luffing cylinder. The A3 oil port of the multi-way valve is connected to the lowering chamber of the hoisting mechanism, and the B3 oil port of the multi-way valve is connected to the lifting chamber of the hoisting mechanism.

[0029] When the telescopic reversing valve is in the lower position, the telescopic linkage micro switch is configured to be open; when the luffing reversing valve is in the upper position, the control luffing linkage micro switch is configured to be open; when the hoisting reversing valve is in the lower position, the hoisting linkage micro switch is configured to be open.

[0030] In some embodiments, the multi-way valve further includes a return oil connection, a rotation control connection, and a second oil inlet connection;

[0031] The rotary control linkage includes a rotary control valve, with the second oil inlet of the multi-way valve unidirectionally connected to the oil inlet of the rotary control valve;

[0032] The rotary control valve includes upper, middle, and lower positions. In the middle position, both the first and second working ports of the rotary control valve are connected to the return port, and the middle oil circuit is open. In the upper position, the inlet port and the first working port are connected, as are the second working port and the return port, and the middle oil circuit is closed. In the lower position... The inlet and second working port of the rotary control valve are in a conductive state, the first working port and the return port of the rotary control valve are in a conductive state, and the middle oil circuit of the rotary control valve is in a disconnected state; the first working port of the rotary control valve is connected to the A4 port of the multi-way valve, the second working port of the rotary control valve is connected to the B4 port of the multi-way valve, and the return port of the rotary control valve is connected to the return port of the multi-way valve; the A4 port of the multi-way valve is connected to the forward rotation chamber of the rotary mechanism, and the B4 port of the multi-way valve is connected to the reverse rotation chamber of the rotary mechanism;

[0033] The oil return valve includes a fifth check valve and a third relief valve;

[0034] The oil inlet of the fifth check valve is connected to the second oil inlet of the multi-way valve, the oil outlet of the fifth check valve is connected to the oil inlet of the hoist reversing valve, and the rotary control valve is set in the oil line between the oil inlet of the fifth check valve and the second oil inlet of the multi-way valve. The middle oil line of the rotary control valve is configured to control the on / off state of the second oil inlet of the multi-way valve and the oil inlet of the fifth check valve.

[0035] The oil inlet of the third relief valve is connected to the oil line between the oil inlet of the fifth check valve and the second oil inlet of the multi-way valve, and the oil outlet of the third relief valve is connected to the oil return port of the multi-way valve.

[0036] The second oil inlet connector is located between the second oil inlet of the multi-way valve and the oil return port of the multi-way valve. The second oil inlet connector is configured to control the oil flow between the second oil inlet of the multi-way valve and the oil return port of the multi-way valve.

[0037] In some embodiments, the oil supply system includes a tandem pump, wherein the outlet of the larger hydraulic pump of the tandem pump is connected to the first inlet of the multi-way valve, and the outlet of the smaller hydraulic pump of the tandem pump is connected to the second inlet of the multi-way valve.

[0038] The beneficial effects of the present invention are: (1) In order to realize the torque limiting function of the truck crane, micro switches are installed at the end caps of the telescopic control link, the luffing control link and the hoisting control link of the multi-way valve respectively. Through the mutual cooperation of each micro switch and the valve core push rod, the torque control system cooperates with the electromagnetic reversing valve in the multi-way valve to gain or lose power, so that the truck crane has the torque limiting function during the telescopic extension, luffing descent and hoisting operation, thus realizing the integration of the torque limiting function.

[0039] (2) When the hoisting mechanism is in operation, the first oil inlet and the second oil inlet of the multi-way valve combine to supply oil. If the hoisting torque exceeds the limit, the oil in the first oil inlet and the second oil inlet of the multi-way valve will be unloaded at the same time, thus realizing the function of combining and unloading the hoisting mechanism.

[0040] (3) In addition to limiting the telescopic extension, luffing and hoisting directions, the torque control system of the present invention can also integrate micro switches in the telescopic extension, luffing and hoisting or slewing directions according to the usage requirements to achieve other action restrictions. Attached Figure Description

[0041] Figure 1 This is a hydraulic schematic diagram of the multi-way valve of the present invention;

[0042] Figure 2 This is an external view of the multi-way valve of the present invention;

[0043] Figure 3 This is a cross-sectional view of the multi-way valve telescopic control linkage of the present invention.

[0044] Figure 4 This is a cross-sectional view of the multi-way valve amplitude control linkage of the present invention.

[0045] Figure 5 This is a cross-sectional view of the multi-way valve hoist control system of the present invention.

[0046] Figure 6 This is a hydraulic schematic diagram of the torque integrated control system of the present invention;

[0047] In the diagram, 0 is the multi-way valve, 1 is the first oil inlet valve, 11 is the first check valve, 12 is the solenoid directional valve, 13 is the first relief valve, 2 is the telescopic control valve, 21 is the second check valve, 22 is the telescopic directional valve, 23 is the telescopic control micro switch, 24 is the telescopic valve core push rod, 25 is the telescopic micro switch connecting plate, 3 is the luffing control valve, 31 is the third check valve, 32 is the luffing directional valve, 33 is the luffing micro switch, 34 is the luffing valve core push rod, 35 is the luffing micro switch connecting plate, and 4 is the hoisting control valve. 41. Fourth check valve; 42. Winch directional valve; 43. Winch linkage micro switch; 44. Winch linkage valve core push rod; 45. Winch linkage micro switch connecting plate; 5. Return oil linkage; 51. Fifth check valve; 52. Third relief valve; 6. Slewing control linkage; 61. Slewing control valve; 62. Sixth check valve; 7. Second oil inlet linkage; 71. Second relief valve; 72. Seventh check valve; 8. Telescopic cylinder; 9. Luffing cylinder; 10. Winch mechanism; 100. Slewing mechanism; L1. Large hydraulic pump; L2. Small hydraulic pump. Detailed Implementation

[0048] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0049] like Figures 1 to 6 As shown, a multi-way valve with a micro switch is disclosed. The multi-way valve 0 includes a first oil inlet link 1, a telescopic control link 2, a luffing control link 3, and a hoisting control link 4.

[0050] like Figure 1 and Figure 3 As shown, the telescopic control linkage 2 includes a second check valve 21 and a telescopic directional valve 22. The first inlet P1 of the multi-way valve 0 is connected to the inlet F4 of the telescopic directional valve 22 through the second check valve 21. The first inlet P1 of the multi-way valve 0 is connected to the inlet of the second check valve 21, and the outlet of the second check valve 21 is connected to the inlet F4 of the telescopic directional valve 22. A telescopic linkage micro switch 23 is provided on the end cap of the telescopic directional valve 22 through a telescopic linkage micro switch connecting plate 25. The telescopic linkage valve core push rod 24, which is movably mounted on the telescopic directional valve 22, is configured to control the opening and closing of the telescopic linkage micro switch 23. Specifically, the telescopic valve core push rod 24 is connected to the valve core movably disposed in the telescopic reversing valve 22. The movement of the valve core in the telescopic reversing valve 22 can drive the telescopic valve core push rod 24 to move. The movement of the telescopic valve core push rod 24 can trigger the telescopic micro switch 23, controlling the telescopic micro switch 23 to open or close.

[0051] There are several possible combinations of the connection between the telescopic valve core push rod 24 and the telescopic micro switch 23.

[0052] In some embodiments, the telescopic valve core push rod 24 is structurally configured to include a grooved surface and a non-grooved surface. When the telescopic valve core push rod 24 moves with the valve core of the telescopic reversing valve 22, causing the roller of the telescopic micro switch 23 to contact the non-grooved surface of the telescopic valve core push rod 24, the telescopic micro switch 23 is opened. When the telescopic valve core push rod 24 moves further, causing the roller of the telescopic micro switch 23 to contact the grooved surface of the telescopic valve core push rod 24, the telescopic micro switch 23 is closed.

[0053] like Figure 1 and Figure 4 As shown, the luffing control linkage 3 includes a third check valve 31 and a luffing directional valve 32. The first inlet P1 of the multi-way valve 0 is connected to the inlet G4 of the luffing directional valve 32 through the third check valve 31. The first inlet P1 of the multi-way valve 0 is connected to the inlet of the third check valve 31, and the outlet of the third check valve 31 is connected to the inlet G4 of the luffing directional valve 32. A luffing linkage micro switch 33 is provided on the end cover of the luffing directional valve 32 through a luffing linkage micro switch connecting plate 35. The luffing linkage valve core push rod 34, which is movably mounted on the luffing directional valve 32, is configured to control the opening and closing of the luffing linkage micro switch 33. Specifically, the luffing valve core push rod 34 is connected to the valve core movably disposed in the luffing directional valve 32. The movement of the valve core in the luffing directional valve 32 can drive the luffing valve core push rod 34 to move. The movement of the luffing valve core push rod 34 can trigger the control luffing micro switch 33, thereby controlling the opening or closing of the luffing micro switch 33.

[0054] The structure of the luffing valve core push rod 34 is the same as that of the telescopic valve core push rod 24, except that the luffing valve core push rod 34 has a grooved surface and a non-grooved surface. When the luffing valve core push rod 34 moves with the valve core of the luffing directional valve 32, causing the roller of the luffing micro switch 33 to contact the non-grooved surface of the luffing valve core push rod 34, the luffing micro switch 33 is opened. When the luffing valve core push rod 34 moves further, causing the roller of the luffing micro switch 33 to contact the grooved surface of the luffing valve core push rod 34, the luffing micro switch 33 is closed.

[0055] like Figure 1 and Figure 5As shown, the hoist control linkage 4 includes a fourth check valve 41 and a hoist directional valve 42. The first oil inlet P1 of the multi-way valve 0 is connected to the oil inlet H4 of the hoist directional valve 42 through the fourth check valve 41. The first oil inlet P1 of the multi-way valve 0 is connected to the oil inlet of the fourth check valve 41, and the oil outlet of the fourth check valve 41 is connected to the oil inlet H4 of the hoist directional valve 42. The telescopic directional valve 22 and the luffing directional valve 32 are both arranged in the oil line between the first oil inlet of the multi-way valve 0 and the oil inlet of the hoist directional valve 42. The telescopic directional valve 22 and the luffing directional valve 32 work together to control the unidirectional flow from the first oil inlet of the multi-way valve 0 to the oil inlet of the hoist directional valve 42. A winch-connected microswitch 43 is mounted on the end cover of the winch-connected directional valve 42 via a winch-connected microswitch connecting plate 45. A winch-connected valve core push rod 44, movably mounted on the winch-connected directional valve 42, is configured to control the opening and closing of the winch-connected microswitch 43. Specifically, the winch-connected valve core push rod 44 is connected to a valve core movably mounted inside the winch-connected directional valve 42. The movement of the valve core within the winch-connected directional valve 42 can drive the winch-connected valve core push rod 44 to move. The movement of the winch-connected valve core push rod 44 can trigger the winch-connected microswitch 43, controlling its opening or closing.

[0056] The winch-connected valve core push rod 44 has the same structural configuration as the telescopic valve core push rod 24, but with a grooved surface and a non-grooved surface. When the winch-connected valve core push rod 44 moves with the valve core of the winch-connected directional valve 42, causing the roller of the winch-connected micro switch 43 to contact the non-grooved surface of the winch-connected valve core push rod 44, the winch-connected micro switch 43 is opened. When the winch-connected valve core push rod 44 moves further, causing the roller of the winch-connected micro switch 43 to contact the grooved surface of the winch-connected valve core push rod 44, the winch-connected micro switch 43 is closed.

[0057] Microswitches are installed on the end caps of the multi-way valve telescopic control link 2, the luffing control link 3, and the hoisting control link 4. The microswitches are opened and closed by the movement of the valve cores in each link, which drives the valve core push rods. When the microswitches are open, the torque system activates the torque limit recognition function; when the microswitches are closed, the torque system deactivates the torque limit recognition function.

[0058] like Figure 1As shown, the first oil inlet connector 1 is located between the first oil inlet P1 and the return oil port T of the multi-way valve 0. The first oil inlet connector 1 is configured to control the oil flow between the first oil inlet P1 and the return oil port T of the multi-way valve 0. Specifically, when the first oil inlet connector 1 controls the first oil inlet P1 and the return oil port T of the multi-way valve 0 to be in a conductive state, that is, when the first oil inlet connector 1 controls the first oil inlet P1 of the multi-way valve 0 to form an unloading oil path through the first oil inlet connector 1 and the return oil port T of the multi-way valve 0, pressure cannot be built up inside the multi-way valve 0, that is, the telescopic control connector 2, the luffing control connector 3, and the hoisting control connector 4 cannot obtain hydraulic oil from the first oil inlet P1 of the multi-way valve 0 for normal operation. When the first oil inlet link 1 controls the first oil inlet P1 of the multi-way valve 0 to be disconnected from the return oil port T of the multi-way valve 0 (including the disconnection state with pressure limit, that is, when the pressure at the first oil inlet P1 of the multi-way valve 0 does not exceed a certain value, the first oil inlet P1 of the multi-way valve 0 and the return oil port T of the multi-way valve 0 are also disconnected; when the pressure at the first oil inlet P1 of the multi-way valve 0 exceeds a certain value, the first oil inlet P1 of the multi-way valve 0 and the return oil port T of the multi-way valve 0 are in a conducting state), pressure can be built up inside the multi-way valve 0, that is, the telescopic control link 2, the luffing control link 3 and the hoisting control link 4 can obtain hydraulic oil from the first oil inlet P1 of the multi-way valve 0 for normal operation.

[0059] There are several control methods available for the first oil inlet unit 1 that can achieve the above objectives.

[0060] In some embodiments, such as Figure 1 As shown, the first oil inlet valve 1 includes a first check valve 11, a solenoid directional valve 12, and a first relief valve 13. The oil inlet P3 of the first relief valve 13 is connected to the first oil inlet P1 of the multi-way valve 0. The pilot chamber J1 of the first relief valve 13 is connected to the oil inlet P4 of the solenoid directional valve 12, and is also connected to the oil inlet P4 of the solenoid directional valve 12 via the first check valve 11. The pilot chamber J1 of the first relief valve 13 is connected to the oil inlet of the first check valve 11. The oil outlet of the first check valve 11 is connected to the oil inlet P4 of the solenoid directional valve 12. The oil outlet T3 of the first relief valve 13 and the oil outlet T4 of the solenoid directional valve 12 are both connected to the return port T of the multi-way valve 0.

[0061] The electromagnetic directional valve 12 includes a first position and a second position. When the electromagnetic directional valve 12 is de-energized and in the first position, the oil inlet P4 of the electromagnetic directional valve 12 is connected to the oil return port T of the multi-way valve 0. At this time, the first relief valve 13 has no pressure or has a very low pressure limit, so that the first oil inlet P1 of the multi-way valve 0 forms an unloading oil circuit through the first relief valve 13 to the oil return port T of the multi-way valve 0. The multi-way valve 0 cannot build up pressure or cannot build up enough pressure so that the telescopic control link 2, the luffing control link 3 and the hoisting control link 4 can obtain hydraulic oil from the first oil inlet P1 of the multi-way valve 0 and then operate normally. When the solenoid directional valve 12 is energized and in the second position, the oil inlet P4 of the solenoid directional valve 12 is disconnected from the oil outlet T4 of the solenoid directional valve 12. At this time, the first relief valve 13 works normally and plays a pressure regulating role to protect the hydraulic system. The multi-way valve 0 works normally to build up pressure. The telescopic control link 2, the luffing control link 3 and the hoisting control link 4 can obtain hydraulic oil from the first oil inlet P1 of the multi-way valve 0 and then operate normally.

[0062] In some embodiments, the telescopic reversing valve 22, the luffing reversing valve 32, and the hoisting reversing valve 42 are all three-position six-way reversing valves.

[0063] like Figure 1 and Figure 6 As shown, the telescopic directional valve 22 includes an upper position, a middle position, and a lower position. When the telescopic directional valve 22 is in the middle position, its inlet F4, first working port F3, second working port F2, and return port F1 are all disconnected, and the middle oil circuit of the telescopic directional valve 22 is open. When the telescopic directional valve 22 is in the upper position, its inlet F4 and first working port F3 are connected, its second working port F2 and return port F1 are connected, and the middle oil circuit of the telescopic directional valve 22 is disconnected. The telescopic directional valve 22 is in the lower position, with its inlet F4 connected to its second working port F2, and its first working port F3 connected to its return port F1. The middle oil circuit of the telescopic directional valve 22 is disconnected. The first working port F3 of the telescopic directional valve 22 is connected to the A1 port of the multi-way valve 0, the second working port F2 of the telescopic directional valve 22 is connected to the B1 port of the multi-way valve 0, and the return port F1 of the telescopic directional valve 22 is connected to the return port T of the multi-way valve 0.

[0064] The luffing directional valve 32 includes upper, middle, and lower positions. In the middle position, the inlet G4, first working port G3, second working port G2, and return port G1 of the luffing directional valve 32 are all disconnected, and the middle oil circuit of the luffing directional valve 32 is open. In the upper position, the inlet G4 and first working port G3 are connected, the second working port G2 and return port G1 are connected, and the middle oil circuit of the luffing directional valve 32 is disconnected. The luffing directional valve 32 is in the lower position, with its inlet G4 and second working port G2 connected, its first working port G3 and return port G1 connected, and its intermediate oil circuit disconnected. The first working port G3 of the luffing directional valve 32 is connected to port A2 of the multi-way valve 0, the second working port G2 is connected to port B2 of the multi-way valve 0, and the return port G1 is connected to port T of the multi-way valve 0.

[0065] The winch directional valve 42 includes upper, middle, and lower positions. In the middle position, both the first working port H3 and the second working port H2 of the winch directional valve 42 are connected to the return port H1, and the middle oil circuit of the winch directional valve 42 is open. In the upper position, the inlet port H4 of the winch directional valve 42 is connected to the first working port H3, and the second working port H2 is connected to the return port H1, and the middle oil circuit of the winch directional valve 42 is closed. The winch directional valve 42 is in the lower position, with its inlet H4 and second working port H2 connected, its first working port H3 and return port H1 connected, and its intermediate oil circuit disconnected. The first working port H3 of the winch directional valve 42 is connected to port A3 of the multi-way valve 0, the second working port H2 is connected to port B3 of the multi-way valve 0, and the return port H1 is connected to the return port T of the multi-way valve 0.

[0066] like Figure 1As shown, the first inlet P1 of the multi-way valve 0 is connected to the inlet H4 of the hoisting directional valve 42 and the intermediate oil passage of the boom directional valve 32, respectively, after passing through the intermediate oil passage of the telescopic directional valve 22 and the intermediate oil passage of the boom directional valve 32. The intermediate oil passage of the hoisting directional valve 42 is also connected to the return port T of the multi-way valve 0. The intermediate oil passages of the telescopic directional valve 22 and the boom directional valve 32 are both in the conducting state, that is, when the telescopic directional valve 22 and the boom directional valve 32 are simultaneously in the neutral position, the first inlet P1 of the multi-way valve 0 is connected to the inlet H4 of the hoisting directional valve 42.

[0067] like Figure 1 and Figure 2 As shown, in some embodiments, the multi-way valve 0 further includes a rotary control link 6 and a second oil inlet link 7.

[0068] The rotary control linkage 6 includes a rotary control valve 61 and a sixth check valve 62. The second oil inlet P2 of the multi-way valve 0 is connected to the oil inlet I3 of the rotary control valve 61 through the sixth check valve 62. The second oil inlet P2 of the multi-way valve 0 is connected to the oil inlet of the sixth check valve 62. The oil outlet of the sixth check valve 62 is connected to the oil inlet I3 of the rotary control valve 61.

[0069] The rotary control valve 61 is a three-position six-way directional valve, including an upper position, a middle position, and a lower position. When the rotary control valve 61 is in the middle position, its first working port I4, its second working port I1, and its return port I2 are all in a conductive state, and the middle oil circuit of the rotary control valve 61 is conductive. When the rotary control valve 61 is in the upper position, its inlet port I3 and its first working port I4 are in a conductive state, its second working port I1 and its return port I2 are in a conductive state, and the middle oil circuit of the rotary control valve 61 is disconnected. The rotary control valve 61 is in the lower position, with its inlet I3 connected to its second working port I1, and its first working port I4 connected to its return port I2. The intermediate oil circuit of the rotary control valve 61 is disconnected. The first working port I4 of the rotary control valve 61 is connected to port A4 of the multi-way valve 0, the second working port I1 is connected to port B4 of the multi-way valve 0, and the return port I2 of the rotary control valve 61 is connected to port T of the multi-way valve 0. Port A4 of the multi-way valve 0 is connected to the forward rotation chamber of the rotary mechanism 100, and port B4 of the multi-way valve 0 is connected to the reverse rotation chamber of the rotary mechanism 100.

[0070] The second oil inlet connector 7 is located between the second oil inlet P2 and the return oil port T of the multi-way valve 0. The second oil inlet connector 7 is configured to control the oil flow between the second oil inlet P2 and the return oil port T of the multi-way valve 0. Specifically, when the second oil inlet connector 7 controls the second oil inlet P2 and the return oil port T of the multi-way valve 0 to be in a conductive state, that is, when the second oil inlet connector 7 controls the second oil inlet P2 of the multi-way valve 0 to form an unloading oil path with the return oil port T of the multi-way valve 0, pressure cannot be built up inside the multi-way valve 0, that is, the rotation control connector 6 cannot obtain hydraulic oil from the second oil inlet P2 of the multi-way valve 0 for normal operation. When the second oil inlet link 7 controls the second oil inlet P2 of the multi-way valve 0 to be disconnected from the return oil port T of the multi-way valve 0 (including the disconnection state with pressure limit, that is, when the pressure at the second oil inlet P2 of the multi-way valve 0 does not exceed a certain value, the second oil inlet P2 of the multi-way valve 0 and the return oil port T of the multi-way valve 0 are also disconnected; when the pressure at the second oil inlet P2 of the multi-way valve 0 exceeds a certain value, the second oil inlet P2 of the multi-way valve 0 and the return oil port T of the multi-way valve 0 are in a conducting state), pressure can be built up inside the multi-way valve 0, that is, the rotary control link 6 can obtain hydraulic oil from the first oil inlet P1 of the multi-way valve 0 for normal operation.

[0071] The control principle of the second oil inlet line 7 is the same as that of the first oil inlet line 1, and the second oil inlet line 7 and the first oil inlet line 1 share the same solenoid directional valve 12.

[0072] In some embodiments, such as Figure 1 As shown, the second oil inlet valve 7 includes a second relief valve 71 and a seventh check valve 72. The oil inlet P6 of the second relief valve 71 is connected to the second oil inlet P2 of the multi-way valve 0. The pilot chamber J2 of the second relief valve 71 is connected to the oil inlet P4 of the solenoid directional valve 12, and the pilot chamber J2 of the second relief valve 71 is connected to the oil inlet P4 of the solenoid directional valve 12 through the seventh check valve 72. The pilot chamber J2 of the relief valve 71 is connected to the oil inlet of the seventh check valve 72. The oil outlet of the seventh check valve 72 is connected to the oil inlet P4 of the solenoid directional valve 12 in sequence through the external control port K2 and external control port K1 of the multi-way valve 0. The oil outlet T6 of the second relief valve 71 is connected to the return port T of the multi-way valve 0.

[0073] In some embodiments, the multi-way valve 0 further includes a return oil connection 5, which includes a fifth check valve 51 and a third relief valve 52.

[0074] The inlet of the fifth check valve 51 is connected to the second inlet P2 of the multi-way valve 0, and the outlet of the fifth check valve 51 is connected to the inlet H4 of the hoisting directional valve 42. A rotary control valve 61 is installed in the oil line between the inlet of the fifth check valve 51 and the second inlet of the multi-way valve 0, and is configured to control the opening and closing of the second inlet of the multi-way valve 0 and the inlet of the fifth check valve 51. Specifically, when the rotary control valve 61 is in the neutral position, the second inlet P2 of the multi-way valve 0 is connected to the inlet H4 of the hoisting directional valve 42. The aforementioned return oil connection 5 allows the first inlet P1 and the second inlet P2 of the multi-way valve 0 to merge and supply oil to the hoisting directional connection 4.

[0075] The oil inlet of the third overflow valve 52 is connected to the oil line between the oil inlet of the fifth check valve 51 and the second oil inlet P2 of the multi-way valve 0, and the oil outlet of the third overflow valve 52 is connected to the oil return port T of the multi-way valve 0.

[0076] The present invention also provides a torque integrated control system, such as Figures 1 to 6 As shown, the multi-way valve with micro-switch described above includes the first oil inlet P1 of the multi-way valve 0 connected to the oil supply system, and the return oil port T of the multi-way valve 0 connected to the oil tank; the A1 oil port of the multi-way valve 0 is connected to the rod chamber of the telescopic cylinder 8, and the B1 oil port of the multi-way valve 0 is connected to the rodless chamber of the telescopic cylinder 8; the A2 oil port of the multi-way valve 0 is connected to the rod chamber of the luffing cylinder 9, and the B2 oil port of the multi-way valve 0 is connected to the rodless chamber of the luffing cylinder 9; the A3 oil port of the multi-way valve 0 is connected to the lowering chamber of the hoisting mechanism 10, and the B3 oil port of the multi-way valve 0 is connected to the lifting chamber of the hoisting mechanism 10.

[0077] When the telescopic reversing valve 22 is in the lower position, the telescopic linkage micro switch 23 is configured to be open; when the luffing reversing valve 32 is in the upper position, the control luffing linkage micro switch 33 is configured to be open; when the hoisting reversing valve 42 is in the lower position, the hoisting linkage micro switch 43 is configured to be open.

[0078] The working principle of the above-mentioned torque integrated control system is as follows:

[0079] The first oil inlet link 1 includes a first check valve 11, a solenoid directional valve 12, and a first relief valve 13. The first oil inlet P1 is used to supply oil to the telescopic control link 2, the luffing control link 3, and the hoisting control link 4. When the solenoid directional valve 12 is energized, the pilot chamber J1 of the first relief valve 13 is closed, and the first relief valve 13 can regulate the pressure, allowing the multi-way valve 0 to work normally to build up pressure. When the solenoid directional valve 12 is de-energized, the oil in the pilot chamber J1 of the first relief valve 13 is returned to the oil tank through the return port T of the multi-way valve 0 via the solenoid directional valve 12. At this time, the first oil circuit is unloaded, and the multi-way valve 0 cannot build up pressure.

[0080] When the solenoid directional valve 12 is energized, the oil inlet P4 to the oil outlet T4 of the solenoid directional valve 12 is disconnected. During lifting operations, when the telescopic control linkage 22 is operated to its lower position, the hydraulic oil at the first inlet P1 of the multi-way valve 0 passes through the second check valve 21 to the inlet F4 of the telescopic directional valve 22, and then through the second working port F2 of the telescopic directional valve 22 to the B1 port of the multi-way valve 0. The oil finally reaches the rodless chamber of the telescopic cylinder 8, driving the piston rod of the telescopic cylinder 8 to extend, causing the telescopic cylinder 8 to move in the direction of increasing force limit. When the telescopic directional valve 22 is in its lower position, the valve core of the telescopic directional valve 22 drives the telescopic linkage valve core push rod 24 to move, causing the roller of the telescopic linkage micro switch 23 to contact the non-grooved surface of the telescopic linkage valve core push rod 24. The telescopic linkage micro switch 23 opens, and the force limit system activates the torque limit recognition function. When the force limit system's calibration value is not reached, the force limit system identifies it as being in a safe state, the solenoid directional valve 12 remains energized, and the telescopic cylinder 8 can continue to extend. When the force limit system's calibration value is reached, the force limit system identifies it as being in a dangerous state, the solenoid directional valve 12 changes from being energized to being de-energized, the oil inlet P4 of the solenoid directional valve 12 connects to the oil outlet T4 of the solenoid directional valve 12, the oil in the pilot chamber J1 of the first relief valve 13 is returned to the oil tank through the solenoid directional valve 12 and the return port T of the multi-way valve 0, the first relief valve 13 opens, the oil inlet P3 of the first relief valve 13 connects to the oil outlet T3 of the first relief valve 13, the oil in the first inlet line passes through the oil inlet P3 of the first relief valve 13, the oil outlet T3 of the first relief valve 13, and the return port T of the multi-way valve 0 in sequence to be unloaded to the oil tank. At this time, if the telescopic directional valve 22 is kept in the lower position, the telescopic cylinder 8 will no longer extend. Manipulate the telescopic directional valve 22 to the upper position. The valve core of the telescopic directional valve 22 drives the telescopic valve core push rod 24 to move. The roller of the telescopic micro switch 23 returns to the groove surface of the telescopic valve core push rod 24. The telescopic micro switch 23 closes. The force limit system closes the torque limit recognition function and recognizes that it is in a safe state. The electromagnetic directional valve 12 changes from de-energized to energized. The oil inlet P4 of the electromagnetic directional valve 12 is disconnected from the oil outlet T4 of the electromagnetic directional valve 12. The pilot chamber J1 of the first relief valve 13 is closed. If the first relief valve 13 does not reach the set pressure, the oil inlet P3 of the first relief valve 13 is disconnected from the oil outlet T3 of the first relief valve 13. The multi-way valve 0 can build pressure, and the force limit state is released.

[0081] When the electromagnetic directional valve 12 is energized, the oil inlet P4 to the oil outlet T4 of the electromagnetic directional valve 12 is disconnected. Under lifting conditions, when the luffing control linkage 32 is operated to the upper position, the hydraulic oil at the first inlet P1 of the multi-way valve 0 passes through the third check valve 31 to the inlet G4 of the luffing directional valve 32, then through the first working port G3 of the luffing directional valve 32 to the A2 port of the multi-way valve 0. The oil finally reaches the rod chamber of the luffing cylinder 9, causing the piston rod of the luffing cylinder 9 to retract, and the luffing cylinder 9 to move in the direction of increasing force limit. When the luffing directional valve 32 is in the lower position, the valve core of the luffing directional valve 32 drives the luffing linkage valve core push rod 34 to move. The roller of the luffing linkage micro switch 33 contacts the non-grooved surface of the luffing linkage valve core push rod 34, opening the luffing linkage micro switch 33 and activating the torque limit recognition function of the force limit system. When the calibrated value of the force limit system is not reached, the force limit system identifies that it is in a safe state, the solenoid directional valve 12 remains energized, and the luffing cylinder 9 can continue to retract. When the calibrated value of the force limit system is reached, the force limit system identifies that it is in a dangerous state, the solenoid directional valve 12 changes from energized to de-energized, the oil inlet P4 of the solenoid directional valve 12 is connected to the oil outlet T4 of the solenoid directional valve 12, the oil in the pilot chamber J1 of the first relief valve 13 is returned to the oil tank through the solenoid directional valve 12 and the return port T of the multi-way valve 0, the first relief valve 13 is opened, the oil inlet P3 of the first relief valve 13 is connected to the oil outlet T3 of the first relief valve 13, the oil inlet T3 of the first relief valve 13 is unloaded to the oil tank in sequence through the oil inlet P3 of the first relief valve 13, the oil outlet T3 of the first relief valve 13, and the return port T of the multi-way valve 0. At this time, if the luffing directional valve 32 is kept in the upper position, the luffing cylinder 9 will no longer retract. When the luffing directional valve 32 is moved to the lower position, the valve core of the luffing directional valve 32 drives the luffing linkage valve core push rod 34 to move. The roller of the luffing linkage switch 33 returns to the groove surface of the luffing linkage valve core push rod 34, the luffing linkage micro switch 33 closes, the force limit system closes the torque limit recognition function and recognizes that it is in a safe state, the electromagnetic directional valve 12 changes from de-energized to energized, the oil inlet P4 of the electromagnetic directional valve 12 is disconnected from the oil outlet T4 of the electromagnetic directional valve 12, the pilot chamber J1 of the first relief valve 13 is closed, and if the first relief valve 13 does not reach the set pressure, the oil inlet P3 of the first relief valve 13 is disconnected from the oil outlet T3 of the first relief valve 13, the multi-way valve 0 can build pressure, and the force limit state is released.

[0082] When the solenoid directional valve 12 is energized, the oil inlet P4 to the oil outlet T4 of the solenoid directional valve 12 is disconnected. Under lifting conditions, the telescopic directional valve 22 is in the neutral position, the luffing directional valve 32 is in the neutral position, and the winch directional valve 42 of the winch control linkage 4 is in the lower position. The hydraulic oil at the first inlet P1 of the multi-way valve 0 passes through the fourth check valve 41 to the inlet H4 of the winch directional valve 42, and then through the second working oil port H2 of the winch directional valve 42 to the B3 oil port of the multi-way valve 0. The oil finally reaches the lifting chamber of the winch mechanism 10, and the winch mechanism 10 lifts and moves in the direction of increasing force limit. With the hoisting directional valve 42 in the lower position, the valve core of the hoisting directional valve 42 drives the luffing coupling valve core push rod 44 to move. The roller of the luffing coupling micro switch 43 contacts the non-grooved surface of the luffing coupling valve core push rod 44, opening the luffing coupling micro switch 43 and activating the torque limit recognition function of the force limit system. When the calibrated value of the force limit system is not reached, the force limit system recognizes that it is in a safe state, the electromagnetic directional valve 12 remains energized, and the hoisting mechanism 10 can continue to lift. When the calibrated value of the force limit system is reached, the force limit system identifies a dangerous state. The electromagnetic reversing valve 12 changes from being energized to being de-energized. The oil inlet P4 of the electromagnetic reversing valve 12 is connected to the oil outlet T4 of the electromagnetic reversing valve 12. The oil in the pilot chamber J1 of the first relief valve 13 is returned to the oil tank through the electromagnetic reversing valve 12 and the return oil port T of the multi-way valve 0. The first relief valve 13 is opened, and the oil inlet P3 of the first relief valve 13 is connected to the oil outlet T3 of the first relief valve 13. The oil in the first oil inlet path is unloaded to the oil tank through the oil inlet P3 of the first relief valve 13, the oil outlet T3 of the first relief valve 13, and the return oil port T of the multi-way valve 0 in sequence. At this time, if the hoisting reversing valve 42 is kept in the lower position, the hoisting mechanism 10 will no longer lift. Manipulate the hoisting directional valve 42 to the upper position. The valve core of the hoisting directional valve 42 drives the luffing valve core push rod 44 to move. The roller of the luffing micro switch 43 returns to the groove surface of the luffing valve core push rod 44. The luffing micro switch 43 closes. The force limit system closes the torque limit recognition function and recognizes that it is in a safe state. The electromagnetic directional valve 12 changes from de-energized to energized. The oil inlet P4 of the electromagnetic directional valve 12 is disconnected from the oil outlet T4 of the electromagnetic directional valve 12. The pilot chamber J1 of the first relief valve 13 is closed. If the first relief valve 13 does not reach the set pressure, the oil inlet P3 of the first relief valve 13 is disconnected from the oil outlet T3 of the first relief valve 13. The multi-way valve 0 can build pressure, and the force limit state is released.

[0083] In some embodiments, the multi-way valve 0 in the torque integrated control system further includes a return oil link 5, a rotation control link 6, and a second oil inlet link 7; the structural principles of the return oil link 5, the rotation control link 6, and the second oil inlet link 7 are the same as described above, and will not be repeated here.

[0084] When the multi-way valve 0 is equipped with a second oil inlet P2, a return oil connection 5, a rotation control connection 6, and a second oil inlet connection 7, the oil supply system adopts a dual pump. The oil outlet of the large hydraulic pump L1 of the dual pump is connected to the first oil inlet P1 of the multi-way valve 0, and the oil outlet of the small hydraulic pump L2 of the dual pump is connected to the second oil inlet P2 of the multi-way valve 0.

[0085] The second oil inlet link 7 shares the same solenoid directional valve 12 as the first oil inlet link 1. The opening and closing of the second oil inlet port P2 of the multi-way valve 0 and the return oil port T of the multi-way valve 0 are also controlled by the solenoid directional valve 12. The second oil inlet link 7 is used to supply oil to the slewing control link 6 and the hoisting control link 4.

[0086] When the hoisting mechanism 10 is in operation, the hydraulic oil at the first inlet P1 of the multi-way valve 0 and the hydraulic oil at the second inlet P2 of the multi-way valve 0 are supplied by merging when the hoisting mechanism 10 is activated.

[0087] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. A multi-way valve with a micro switch, characterized in that: The multi-way valve (0) includes a first oil inlet link (1), a telescopic control link (2), a luffing control link (3), and a hoisting control link (4). The telescopic control link (2) includes a telescopic reversing valve (22), the first oil inlet of the multi-way valve (0) is unidirectionally connected to the oil inlet of the telescopic reversing valve (22), and a telescopic link micro switch (23) is provided on the end cover of the telescopic reversing valve (22). The telescopic link valve core push rod (24) movably provided on the telescopic reversing valve (22) is configured to control the opening and closing of the telescopic link micro switch (23). The luffing control linkage (3) includes a luffing reversing valve (32), with the first oil inlet of the multi-way valve (0) unidirectionally connected to the oil inlet of the luffing reversing valve (32). A luffing linkage micro switch (33) is provided on the end cover of the luffing reversing valve (32), and a luffing linkage valve core push rod (34) movably provided on the luffing reversing valve (32) is configured to control the opening and closing of the luffing linkage micro switch (33). The winch control linkage (4) includes a winch reversing valve (42). The first oil inlet of the multi-way valve (0) is connected to the oil inlet of the winch reversing valve (42). The telescopic reversing valve (22) and the luffing reversing valve (32) are both set in the oil line between the first oil inlet of the multi-way valve (0) and the oil inlet of the winch reversing valve (42). The telescopic reversing valve (22) and the luffing reversing valve (32) work together to control the unidirectional flow of the first oil inlet of the multi-way valve (0) to the oil inlet of the winch reversing valve (42). A winch linkage micro switch (43) is provided on the end cover of the winch reversing valve (42). The winch linkage valve core push rod (44) movably set on the winch reversing valve (42) is configured to control the opening and closing of the winch linkage micro switch (43). The first oil inlet link (1) is located between the first oil inlet of the multi-way valve (0) and the return oil port of the multi-way valve (0). The first oil inlet link (1) is configured to control the oil circuit connection between the first oil inlet of the multi-way valve (0) and the return oil port of the multi-way valve (0). The multi-way valve (0) also includes a rotary control link (6) and a second oil inlet link (7); The rotary control linkage (6) includes a rotary control valve (61), and the second oil inlet of the multi-way valve (0) is unidirectionally connected to the oil inlet of the rotary control valve (61); The second oil inlet connector (7) is located between the second oil inlet of the multi-way valve (0) and the return oil port of the multi-way valve (0). The second oil inlet connector (7) is configured to control the oil flow between the second oil inlet of the multi-way valve (0) and the return oil port of the multi-way valve (0). The first oil inlet assembly (1) includes a solenoid directional valve (12) and a first relief valve (13). The oil inlet of the first relief valve (13) is connected to the first oil inlet of the multi-way valve (0). The pilot chamber of the first relief valve (13) is connected to the oil inlet of the solenoid directional valve (12) and is unidirectionally connected from the pilot chamber of the first relief valve (13) to the oil inlet of the solenoid directional valve (12). The oil outlet of the first relief valve (13) and the oil outlet of the solenoid directional valve (12) are both connected to the return port of the multi-way valve (0). The second oil inlet connector (7) includes a second relief valve (71), the oil inlet of the second relief valve (71) is connected to the second oil inlet of the multi-way valve (0), the pilot chamber of the second relief valve (71) is connected to the oil inlet of the solenoid directional valve (12) and is unidirectionally guided from the pilot chamber of the second relief valve (71) to the oil inlet of the solenoid directional valve (12), and the oil outlet of the second relief valve (71) is connected to the return port of the multi-way valve (0); The electromagnetic directional valve (12) includes a first position and a second position. When the electromagnetic directional valve (12) is in the first position, the oil inlet of the electromagnetic directional valve (12) is connected to the oil return port of the multi-way valve (0). At this time, the oil inlet of the first relief valve (13) is connected to the oil outlet of the first relief valve (13), and the oil inlet of the second relief valve (71) is connected to the oil outlet of the second relief valve (71). The first oil inlet of the multi-way valve (0) forms an unloading oil path through the first relief valve (13) to the oil return port of the multi-way valve (0). The second oil inlet of the multi-way valve (0) forms an unloading oil path through the second relief valve (71) and the electromagnetic directional valve (12) to the oil return port of the multi-way valve (0). When the electromagnetic directional valve (12) is in the second position, the oil inlet of the electromagnetic directional valve (12) is disconnected from the oil outlet of the electromagnetic directional valve (12). The multi-way valve (0) also includes a return oil connection (5), which includes a fifth check valve (51) and a third relief valve (52). The oil inlet of the fifth check valve (51) is connected to the second oil inlet of the multi-way valve (0), the oil outlet of the fifth check valve (51) is connected to the oil inlet of the hoisting directional valve (42), and the rotary control valve (61) is set in the oil line between the oil inlet of the fifth check valve (51) and the second oil inlet of the multi-way valve (0) and the rotary control valve (61) is configured to control the opening and closing of the second oil inlet of the multi-way valve (0) and the oil inlet of the fifth check valve (51); The oil inlet of the third overflow valve (52) is connected to the oil line between the oil inlet of the fifth check valve (51) and the second oil inlet of the multi-way valve (0), and the oil outlet of the third overflow valve (52) is connected to the oil return port of the multi-way valve (0).

2. The multi-way valve with a micro switch according to claim 1, characterized in that: The telescopic valve core push rod (24), the amplitude-changing valve core push rod (34), and the hoisting valve core push rod (44) all include grooved surfaces and non-grooved surfaces; When the roller of the telescopic micro switch (23) contacts the non-grooved surface of the telescopic valve core push rod (24), the telescopic micro switch (23) is opened; when the roller of the telescopic micro switch (23) contacts the grooved surface of the telescopic valve core push rod (24), the telescopic micro switch (23) is closed. When the roller of the variable amplitude micro switch (33) contacts the non-grooved surface of the variable amplitude valve core push rod (34), the variable amplitude micro switch (33) is opened; when the roller of the variable amplitude micro switch (33) contacts the grooved surface of the variable amplitude valve core push rod (34), the variable amplitude micro switch (33) is closed. When the roller of the winch-connected micro switch (43) contacts the non-grooved surface of the winch-connected valve core push rod (44), the winch-connected micro switch (43) is opened; when the roller of the winch-connected micro switch (43) contacts the grooved surface of the winch-connected valve core push rod (44), the winch-connected micro switch (43) is closed.

3. The multi-way valve with a micro switch according to claim 1 or 2, characterized in that: The telescopic directional valve (22) includes an upper position, a middle position, and a lower position. When the telescopic directional valve (22) is in the middle position, its inlet, first working port, second working port, and return port are all disconnected, and the middle oil circuit of the telescopic directional valve (22) is open. When the telescopic directional valve (22) is in the upper position, its inlet and first working ports are connected, and its second working port and return port are connected. The middle oil circuit of valve (22) is in the open state; the telescopic directional valve (22) is in the lower position, the oil inlet of the telescopic directional valve (22) is connected to the second working oil port of the telescopic directional valve (22), the first working oil port of the telescopic directional valve (22) is connected to the return oil port of the telescopic directional valve (22), and the middle oil circuit of the telescopic directional valve (22) is in the open state; the first working oil port of the telescopic directional valve (22) is connected to the A1 oil port of the multi-way valve (0), the second working oil port of the telescopic directional valve (22) is connected to the B1 oil port of the multi-way valve (0), and the return oil port of the telescopic directional valve (22) is connected to the return oil port of the multi-way valve (0); The luffing directional valve (32) includes an upper position, a middle position, and a lower position. When the luffing directional valve (32) is in the middle position, its inlet, first working port, second working port, and return port are all disconnected, and the middle oil circuit is open. When the luffing directional valve (32) is in the upper position, its inlet and first working port are connected, and its second working port and return port are connected. The middle oil circuit of valve (32) is in the open state; the luffing directional valve (32) is in the lower position, the oil inlet of the luffing directional valve (32) is connected to the second working oil port of the luffing directional valve (32), the first working oil port of the luffing directional valve (32) is connected to the return oil port of the luffing directional valve (32), and the middle oil circuit of the luffing directional valve (32) is in the open state; the first working oil port of the luffing directional valve (32) is connected to the A2 oil port of the multi-way valve (0), the second working oil port of the luffing directional valve (32) is connected to the B2 oil port of the multi-way valve (0), and the return oil port of the luffing directional valve (32) is connected to the return oil port of the multi-way valve (0); The winch directional valve (42) includes an upper position, a middle position, and a lower position. When the winch directional valve (42) is in the middle position, both its first working port and second working port are connected to its return port, and the middle oil circuit of the winch directional valve (42) is connected. When the winch directional valve (42) is in the upper position, its inlet port is connected to its first working port, and its second working port is connected to its return port, and the middle oil circuit of the winch directional valve (42) is connected. The oil circuit is disconnected; the winch reversing valve (42) is in the lower position, the oil inlet of the winch reversing valve (42) is connected to the second working oil port of the winch reversing valve (42), the first working oil port of the winch reversing valve (42) is connected to the return oil port of the winch reversing valve (42), and the middle oil circuit of the winch reversing valve (42) is disconnected; the first working oil port of the winch reversing valve (42) is connected to the A3 oil port of the multi-way valve (0), the second working oil port of the winch reversing valve (42) is connected to the B3 oil port of the multi-way valve (0), and the return oil port of the winch reversing valve (42) is connected to the return oil port of the multi-way valve (0); The central oil circuit of the telescopic reversing valve (22), the central oil circuit of the luffing reversing valve (32) and the central oil circuit of the winch reversing valve (42) are all located on the oil circuit between the first oil inlet of the multi-way valve (0) and the oil return port of the multi-way valve (0). The central oil circuit of the telescopic reversing valve (22) and the central oil circuit of the luffing reversing valve (32) are both in a conducting state. The first oil inlet of the multi-way valve (0) is connected to the oil inlet of the winch reversing valve (42).

4. A torque integrated control system, characterized in that: The system includes a multi-way valve with a micro switch as described in claim 3. The first oil inlet of the multi-way valve (0) is connected to the oil supply system, and the return oil port of the multi-way valve (0) is connected to the oil tank. The A1 oil port of the multi-way valve (0) is connected to the rod chamber of the telescopic cylinder (8), and the B1 oil port of the multi-way valve (0) is connected to the rodless chamber of the telescopic cylinder (8). The A2 oil port of the multi-way valve (0) is connected to the rod chamber of the luffing cylinder (9), and the B2 oil port of the multi-way valve (0) is connected to the rodless chamber of the luffing cylinder (9). The A3 oil port of the multi-way valve (0) is connected to the falling chamber of the hoisting mechanism (10), and the B3 oil port of the multi-way valve (0) is connected to the lifting chamber of the hoisting mechanism (10). When the telescopic reversing valve (22) is in the lower position, the telescopic linkage micro switch (23) is configured to be open; when the amplitude reversing valve (32) is in the upper position, the control amplitude linkage micro switch (33) is configured to be open; when the hoisting reversing valve (42) is in the lower position, the hoisting linkage micro switch (43) is configured to be open.

5. The torque integrated control system according to claim 4, characterized in that: The multi-way valve (0) also includes a return oil connection (5), a rotation control connection (6), and a second oil inlet connection (7); The rotary control linkage (6) includes a rotary control valve (61), and the second oil inlet of the multi-way valve (0) is unidirectionally connected to the oil inlet of the rotary control valve (61); The rotary control valve (61) includes an upper position, a middle position, and a lower position. When the rotary control valve (61) is in the middle position, both its first working port and second working port are connected to its return port, and the middle oil circuit of the rotary control valve (61) is open. When the rotary control valve (61) is in the upper position, its inlet port is connected to its first working port, and its second working port is connected to its return port, and the middle oil circuit of the rotary control valve (61) is closed. When the rotary control valve (61) is in the lower position, the rotary... The inlet of the control valve (61) is connected to the second working port of the rotary control valve (61), the first working port of the rotary control valve (61) is connected to the return port of the rotary control valve (61), and the middle oil circuit of the rotary control valve (61) is disconnected; the first working port of the rotary control valve (61) is connected to the A4 port of the multi-way valve (0), the second working port of the rotary control valve (61) is connected to the B4 port of the multi-way valve (0), and the return port of the rotary control valve (61) is connected to the return port of the multi-way valve (0); the A4 port of the multi-way valve (0) is connected to the forward rotation chamber of the rotary mechanism (100), and the B4 port of the multi-way valve (0) is connected to the reverse rotation chamber of the rotary mechanism (100); The return oil connection (5) includes a fifth check valve (51) and a third relief valve (52). The oil inlet of the fifth check valve (51) is connected to the second oil inlet of the multi-way valve (0), the oil outlet of the fifth check valve (51) is connected to the oil inlet of the hoisting reversing valve (42), and the rotary control valve (61) is set in the oil line between the oil inlet of the fifth check valve (51) and the second oil inlet of the multi-way valve (0), and the middle oil line of the rotary control valve (61) is configured to control the opening and closing of the second oil inlet of the multi-way valve (0) and the oil inlet of the fifth check valve (51); The oil inlet of the third overflow valve (52) is connected to the oil line between the oil inlet of the fifth check valve (51) and the second oil inlet of the multi-way valve (0), and the oil outlet of the third overflow valve (52) is connected to the oil return port of the multi-way valve (0). The second oil inlet connector (7) is located between the second oil inlet of the multi-way valve (0) and the oil return port of the multi-way valve (0). The second oil inlet connector (7) is configured to control the oil flow between the second oil inlet of the multi-way valve (0) and the oil return port of the multi-way valve (0).

6. The torque integrated control system according to claim 5, characterized in that: The oil supply system includes a dual pump, the outlet of the large hydraulic pump of the dual pump is connected to the first inlet of the multi-way valve (0), and the outlet of the small hydraulic pump of the dual pump is connected to the second inlet of the multi-way valve (0).

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