Single cylinder pin control system, boom and jib operating machine

Abstract

The utility model belongs to the technical field of operating machinery and provides a single cylinder bolt control system, telescopic arm and arm support operating machinery, and the system includes pump oil unit, bolt execution mechanism, reversing control valve and unloading oil circuit. Bolt execution mechanism includes cylinder pin oil cylinder and arm pin oil cylinder, reversing control valve is connected with pump oil unit's pump oil port, cylinder pin oil cylinder's rod cavity, arm pin oil cylinder's rod cavity respectively, reversing control valve is used to control cylinder pin oil cylinder's rod cavity and arm pin oil cylinder's rod cavity's one selects with pump oil port and controls the other cut -off, and unloading oil circuit is used for cylinder pin oil cylinder and arm pin oil cylinder's rod cavity unloading, is equipped with on -off valve in unloading oil circuit. The system through the cooperation of on -off valve and reversing control valve not only eliminates the situation that two oil cylinders retract simultaneously from the physical level, but also greatly reduces the number of system components, the number of connecting pipelines, so that the system structure is more compact.

Description

Technical Field

[0001] This utility model belongs to the field of operating machinery technology, specifically relating to a single-cylinder pin control system, a telescopic boom, and boom operating machinery. Background Technology

[0002] In existing control systems for single-cylinder pin-type telescopic mechanisms, two independent directional valves are typically used to control the movements of the arm pin cylinder and the cylinder pin cylinder, respectively. In this control scheme, the safety interlock function between the arm pin and the cylinder pin relies entirely on the software program logic of the upper-level controller.

[0003] In actual operation, if the controller program malfunctions, the sensor signal acquisition is incorrect, or the solenoid valve malfunctions due to its own fault, the control system may issue incorrect commands, potentially causing the two directional valves of the boom pin cylinder and cylinder pin cylinder to be energized simultaneously. If this extreme situation occurs, it will lead to the catastrophic consequence of the boom pin and cylinder pin retracting simultaneously, causing the boom to fall. Utility Model Content

[0004] To address the aforementioned defects or deficiencies, this utility model provides a single-cylinder pin control system, a telescopic boom, and boom-operated machinery, aiming to solve the technical problem of insufficient reliability of the electronic interlock between the boom pin cylinder and the cylinder pin cylinder in existing single-cylinder pin control systems.

[0005] To achieve the above objectives, this utility model provides a single-cylinder pin control system, which includes an oil pumping unit, a pin actuator, a reversing control valve, and an unloading oil circuit. The pin actuator includes a pin cylinder and an arm pin cylinder. The reversing control valve is connected to the oil pumping port of the oil pumping unit via a connecting oil circuit. The reversing control valve is also connected to the rod chamber of the pin cylinder and the arm pin cylinder. The reversing control valve is used to selectively connect one of the rod chambers of the pin cylinder and the arm pin cylinder to the oil pumping port and control the other to be cut off. The unloading oil circuit is used to unload oil from the rod chambers of the pin cylinder and the arm pin cylinder, and a switching valve is provided on the unloading oil circuit.

[0006] In this embodiment, the reversing control valve is connected to the oil pump port of the oil pump unit via a connecting oil circuit, one end of the unloading oil circuit is connected to the connecting oil circuit, and the other end is connected to the oil tank.

[0007] In this embodiment, the single-cylinder pin control system further includes a bypass oil passage of a bypass reversing control valve. One end of the bypass oil passage is connected to the connecting oil passage, and the other end is connected to the rod chamber oil passage of the pin cylinder. A first check valve is provided on the bypass oil passage. The first check valve is used to control the rod chamber oil passage of the pin cylinder to discharge oil unidirectionally to the connecting oil passage.

[0008] In this embodiment, a second check valve is provided on the connecting oil line. The second check valve is configured to open when hydraulic oil flows from the pump port to the reversing control valve and close in the reverse direction. One end of the unloading oil line is connected to the connecting oil line between the second check valve and the reversing control valve.

[0009] In this embodiment, the reversing control valve is a two-position three-way valve with an oil inlet, a first working oil port, and a second working oil port. The oil inlet is used to connect to the pump port of the oil pump unit, the first working oil port is used to connect to the rod chamber of the arm pin cylinder, and the second working oil port is used to connect to the rod chamber of the cylinder pin cylinder. The reversing control valve also has a first working valve position and a second working valve position. In the first working valve position, the first working oil port and the oil inlet are connected and the second working oil port is closed. In the second working valve position, the second working oil port and the oil inlet are connected and the first working oil port is closed.

[0010] In this embodiment, the switching valve is a two-position two-way valve with a shut-off valve position and a conduction valve position. The conduction valve position is the normal valve position, and the shut-off valve position is the reversing valve position. The shut-off valve position is a one-way shut-off valve position. In the one-way shut-off valve position, when the hydraulic oil flows from the end of the unloading oil circuit near the rod chamber to the oil tank, it is shut off and conducts in the reverse direction. Or the shut-off valve position is a two-way shut-off valve position. In the two-way shut-off valve position, the switching valve is shut off in both directions.

[0011] In this embodiment, a pressure detection device is provided in the rod chamber oil circuit of the cylinder pin cylinder and / or arm pin cylinder.

[0012] In this embodiment, the oil pumping unit includes a hydraulic pump and a motor for driving the hydraulic pump; the motor is driven by an external power source; or the oil pumping unit also includes a battery for supplying power to the motor.

[0013] To achieve the above objectives, this utility model also provides a telescopic boom, wherein the telescopic boom includes a single-cylinder pin control system as described above.

[0014] In this embodiment, the telescopic boom also includes a telescopic cylinder, and the pumping unit, reversing control valve, switching valve, cylinder pin cylinder and boom pin cylinder included in the single cylinder pin control system are mounted on the cylinder body of the telescopic cylinder.

[0015] To achieve the above objectives, this utility model also provides a boom operation machine, wherein the boom operation machine includes a telescopic boom as described above.

[0016] Through the above technical solution, the single-cylinder pin control system provided by this utility model embodiment has the following beneficial effects: When the cylinder pin needs to be pulled out, the oil pump unit operates, and the control switch valve is closed, switching the reversing control valve to the valve position where the rod chamber of the cylinder pin cylinder is inlet. This controls the pressure oil output by the oil pump unit to flow only to the rod chamber of the cylinder pin cylinder, and ensures that the rod chamber of the arm pin cylinder is in the cut-off (non-inlet) state. This ensures that only the cylinder pin cylinder retracts, while the arm pin cylinder remains stationary.

[0017] When the arm pin needs to be pulled out, the oil pump unit operates, and the control switch valve is closed, switching the reversing control valve to the valve position where the rod chamber of the arm pin cylinder is inlet. This controls the pressure oil output by the oil pump unit to flow only to the rod chamber of the arm pin cylinder, and ensures that the rod chamber of the cylinder pin cylinder is in the cut-off (non-inlet) state. This ensures that only the arm pin cylinder retracts, while the cylinder pin cylinder remains stationary.

[0018] This system achieves precise control of the cylinder pin and arm pin cylinders through the coordinated operation of a switching valve and a directional control valve. The switching valve acts as the system's "master switch," closing to establish hydraulic pressure when the cylinder needs to move. The directional control valve acts as a "selector," selectively directing hydraulic oil to either the cylinder pin or the arm pin cylinder's rod chamber. This two-valve collaboration not only physically eliminates the possibility of simultaneous retraction of both cylinders but also simplifies the system's control logic, significantly reducing the number of hydraulic components and connecting pipelines, thereby effectively lowering system costs and the risk of failure.

[0019] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0020] The accompanying drawings are provided to illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a hydraulic schematic diagram of a single-cylinder pin control system according to the first embodiment of this utility model. Figure 2 This is a hydraulic schematic diagram of a single-cylinder pin control system according to the second embodiment of this utility model. Figure 3 This is a schematic diagram of the structure of the oil pump unit, reversing control valve, switching valve, cylinder pin cylinder and arm pin cylinder integrated on the cylinder body of the telescopic cylinder according to the embodiments of this utility model.

[0021] Explanation of reference numerals in the attached figures 1. Oil pump unit; 11. Hydraulic pump; 12. Motor; 21. Cylinder pin cylinder; 22. Arm pin cylinder; 3. Reversing control valve; P. Oil inlet; A. First working oil port; B. Second working oil port; 41. Unloading oil circuit; 42. Switch valve; 51. Connecting oil circuit; 52. Second check valve; 61. Bypass oil circuit; 62. First check valve; 71. Pressure detection device; 72. Relief valve; 73. Oil tank; 81. Cable; 82. Charger; 83. Battery; 9. Telescopic cylinder. Detailed Implementation

[0022] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0023] The single-cylinder pin control system of this utility model is described below with reference to the accompanying drawings.

[0024] In telescopic boom cranes, the single-cylinder pin control system is the core mechanism for reliably unlocking and locking the boom sections. By controlling the pin cylinder 21 to insert and remove the pin at appropriate times, and by controlling the boom pin cylinder 22 to insert and remove the boom pin at appropriate times, normal telescopic operation of the single-cylinder boom can be achieved.

[0025] In existing single-cylinder pin control systems, the extension and retraction of the pin cylinder 21 and the arm pin cylinder 22 are typically controlled by two completely independent directional control valves. Under this architecture, if the electronic control system malfunctions and the control timing or control logic of the two directional control valves changes, it is possible for the pin cylinder 21 and the arm pin cylinder 22 to retract simultaneously, potentially leading to a serious safety accident.

[0026] To avoid such a situation, this utility model provides a single-cylinder pin control system, such as... Figure 1 and Figure 2 As shown, the single-cylinder pin control system includes an oil pump unit 1, a pin actuator, a reversing control valve 3, and an unloading oil circuit 41.

[0027] The pin actuator includes a cylinder pin cylinder 21 and an arm pin cylinder 22. Since both cylinder pin cylinder 21 and arm pin cylinder 22 have springs in their rodless chambers, when oil enters the rod chambers of cylinder pin cylinder 21 and arm pin cylinder 22, cylinder pin cylinder 21 and arm pin cylinder 22 retract. When oil is discharged from the rod chambers, cylinder pin cylinder 21 and arm pin cylinder 22 extend under the action of the springs.

[0028] The reversing control valve 3 is connected to the pump port of the pumping unit 1 via a connecting oil circuit 51. The reversing control valve 3 is also connected to the rod chamber of the cylinder pin cylinder 21 and the rod chamber of the arm pin cylinder 22. The reversing control valve 3 is used to selectively connect one of the rod chambers of the cylinder pin cylinder 21 and the arm pin cylinder 22 to the pump port, while simultaneously controlling the other to be cut off. By controlling the reversing control valve 3, the hydraulic oil output from the pumping unit 1 can selectively flow to either the rod chamber of the cylinder pin cylinder 21 or the rod chamber of the arm pin cylinder 22.

[0029] The unloading oil passage 41 is used to unload oil from the rod chambers of the cylinder pin cylinder 21 and the arm pin cylinder 22. The unloading oil passage 41 is equipped with a switching valve 42. By controlling the switching valve 42 to open, the unloading oil passage 41 can unload oil from the rod chambers of the cylinder pin cylinder 21 and the arm pin cylinder 22.

[0030] When the cylinder pin needs to be pulled out, the oil pump unit 1 operates, and the control switch valve 42 is closed, switching the reversing control valve 3 to the valve position where the rod chamber of the cylinder pin cylinder 21 is inlet. This controls the pressure oil output by the oil pump unit 1 to flow only to the rod chamber of the cylinder pin cylinder 21, and ensures that the rod chamber of the arm pin cylinder 22 is in the cut-off (non-inlet) state. This ensures that only the cylinder pin cylinder 21 retracts, while the arm pin cylinder 22 remains stationary.

[0031] When the arm pin needs to be pulled out, the oil pump unit 1 operates, and the control switch valve 42 is closed, switching the reversing control valve 3 to the valve position where the rod chamber of the arm pin cylinder 22 is inlet. This controls the pressure oil output by the oil pump unit 1 to flow only to the rod chamber of the arm pin cylinder 22, and ensures that the rod chamber of the cylinder pin cylinder 21 is in the cut-off (non-inlet) state. This ensures that only the arm pin cylinder 22 retracts, while the cylinder pin cylinder 21 remains stationary.

[0032] In summary, this system achieves precise control of the cylinder pin cylinder 21 and the arm pin cylinder 22 through the coordinated operation of the switching valve 42 and the directional control valve 3. The switching valve 42 acts as the system's "master switch," closing to establish oil pressure when the cylinder needs to move. The directional control valve 3 acts as a "selector," selectively directing hydraulic oil to either the cylinder pin cylinder 21 or the arm pin cylinder 22, focusing on the rod chamber. This two-valve coordination not only physically eliminates the possibility of simultaneous retraction of both cylinders but also simplifies the system control logic, significantly reducing the number of hydraulic components and connecting pipelines, thereby effectively lowering system costs and the risk of failure.

[0033] like Figure 1 and Figure 2 As shown, in this embodiment, the reversing control valve 3 can be a two-position three-way valve. The reversing control valve 3 has at least an oil inlet P, a first working oil port A, and a second working oil port B. The oil inlet P is used to connect to the pumping port of the pumping unit 1, the first working oil port A is used to connect to the rod chamber of the arm pin cylinder 22, and the second working oil port B is used to connect to the rod chamber of the cylinder pin cylinder 21.

[0034] The reversing control valve 3 is also provided with at least a first working valve position and a second working valve position, in the first working valve position ( Figure 1 In the right position of the valve, the first working port A is connected to the inlet port P and the second working port B is closed, in the second working valve position ( Figure 1 (Left position in the middle), the second working oil port B is connected to the oil inlet P and the first working oil port A is closed.

[0035] Of course, the reversing control valve 3 can also be other types of multi-position multi-way valves.

[0036] like Figure 1 and Figure 2 As shown, in this embodiment, the reversing control valve 3 is connected to the pump port of the oil pumping unit 1 via a connecting oil circuit 51. One end of the unloading oil circuit 41 is connected to the connecting oil circuit 51, and the other end is connected to the oil tank 73. By connecting the unloading oil circuit 41 to the connecting oil circuit 51 and cooperating with the reversing control valve 3 through the switching valve 42, the extension and retraction movements of the boom pin cylinder 22 and the cylinder pin cylinder 21 can be independently controlled separately.

[0037] Specifically, such as Figure 1 and Figure 2 As shown, when the reversing control valve 3 is switched to the first working valve position, the control switch valve 42 is turned on to unload the oil from the rod chamber of the boom pin cylinder 22, allowing the boom pin cylinder 22 to independently retract and extend while ensuring that the cylinder pin cylinder 21 remains stationary. Conversely, by turning off the control switch valve 42, the hydraulic oil output from the pump unit 1 flows to the rod chamber of the boom pin cylinder 22, allowing the boom pin cylinder 22 to independently retract. Similarly, switching the reversing control valve 3 to the second working valve position and turning the corresponding switch valve 42 on and off allows for independent control of the extension and retraction of the cylinder pin cylinder 21.

[0038] like Figure 1 and Figure 2 As shown, in this embodiment, the single-cylinder pin control system further includes a bypass oil passage 61 of the bypass reversing control valve 3. One end of the bypass oil passage 61 is connected to the connecting oil passage 51, and the other end is connected to the rod chamber oil passage of the pin cylinder 21. A first check valve 62 is provided on the bypass oil passage 61. The first check valve 62 is used to control the unidirectional discharge of oil from the rod chamber oil passage of the pin cylinder 21 to the connecting oil passage 51. By setting the bypass oil passage 61 and the first check valve 62, the rod chamber of the pin cylinder 21 can be automatically depressurized when the connecting oil passage 51 loses pressure, ensuring that the pin cylinder 21 can automatically reset to the extended state when the system loses pressure.

[0039] like Figure 1 and Figure 2As shown, in this embodiment, preferably, the first working valve position of the reversing control valve 3 can also be set to the normal valve position, that is, the reversing control valve 3 automatically maintains the first working valve position when there is no electricity or pilot oil entering its reversing control end. By setting the first working valve position to the normal valve position, the control arm pin cylinder 22 can automatically reset to the extended state when the connecting oil circuit 51 loses pressure.

[0040] like Figure 1 and Figure 2 As shown, in this embodiment, a second check valve 52 is provided on the connecting oil circuit 51. The second check valve 52 is configured to open when hydraulic oil flows from the pump port to the reversing control valve 3 and close in the reverse direction. One end of the unloading oil circuit 41 is connected to the connecting oil circuit 51 between the second check valve 52 and the reversing control valve 3. By providing the second check valve 52, the backflow of oil in the rod chamber of the cylinder pin cylinder 21 or the arm pin cylinder 22 to the pumping unit 1 can be prevented, thus achieving safety protection for the pumping unit 1.

[0041] like Figure 1 and Figure 2 As shown, in this embodiment, the switching valve 42 is a two-position, two-way valve with a shut-off position and a directional valve position. Preferably, the switching valve 42 can be a normally open solenoid valve or a hydraulic control valve, meaning the directional valve position of the switching valve 42 is the normal valve position, and the shut-off valve position is the directional valve position. The directional valve position refers to the valve position switched when the directional control terminal of the switching valve 42 is energized or when pilot oil enters. Setting the directional valve position to the normal valve position allows for automatic depressurization of the rod chambers of the arm pin cylinder 22 and cylinder pin cylinder 21 when the system loses power, ensuring that the arm pin cylinder 22 and cylinder pin cylinder 21 automatically reset to the extended state under conditions of system depressurization or power failure.

[0042] like Figure 1 and Figure 2 As shown, in this embodiment, the shut-off valve position can be a one-way shut-off valve position. In the one-way shut-off valve position, the hydraulic oil flows from the end of the unloading oil passage 41 near the rod chamber to the oil tank 73, which is then stopped and reversed. Through the reverse reversal function, oil can be replenished when the pumping unit 1 supplies oil to the rod chamber of the cylinder.

[0043] In this embodiment, the shut-off valve position can also be a bidirectional shut-off valve position, in which the switching valve 42 is shut off in both directions.

[0044] like Figure 1 and Figure 2As shown, in this embodiment, a pressure detection device 71 is provided in the rod chamber oil circuit of the cylinder pin cylinder 21 and / or the arm pin cylinder 22. When the cylinder pin cylinder 21 and / or the arm pin cylinder 22 are working, to prevent leakage in the pipeline or valve assembly from causing incorrect cylinder unlocking, the pressure detection device 71 can detect the pressure in the rod chamber oil circuit of the cylinder pin cylinder 21 and / or the arm pin cylinder 22. When the pressure in the rod chamber oil circuit of the cylinder pin cylinder 21 and / or the arm pin cylinder 22 is lower than a set value, the oil pump unit 1 is started, and the reversing control valve 3 is controlled to switch to the corresponding valve position to replenish oil to the rod chamber oil circuit.

[0045] In this embodiment, the oil pumping unit 1 includes a hydraulic pump 11 and a motor 12 for driving the hydraulic pump 11. Figure 1 As shown, in one embodiment, the motor 12 can be driven by an external power source. That is, the system can operate directly by connecting an external cable 81.

[0046] Or such as Figure 2 As shown, in another embodiment, the oil pump unit 1 further includes a battery 83 for supplying power to the motor 12. The external cable 81 can charge the battery 83 via a charger 82, and the electrical energy in the battery 83 can then power the movement of the motor 12. Since the power supplied by the external cable 81 to the battery 83 is much less than the power supplied by the external cable 81 directly driving the motor 12, using the battery 83 as a transfer station effectively reduces the specifications of the external cable 81.

[0047] like Figure 1 and Figure 3 As shown, in this embodiment, the oil pump unit 1, reversing control valve 3, switching valve 42, cylinder pin cylinder 21, and arm pin cylinder 22 included in the single-cylinder pin control system are mounted on the cylinder body of the telescopic cylinder 9. Integrating the oil pump unit 1, reversing control valve 3, switching valve 42, cylinder pin cylinder 21, and arm pin cylinder 22 onto the telescopic cylinder 9 eliminates the need for a core tube inside the piston rod of the telescopic cylinder 9, thus reducing the size of the telescopic cylinder 9.

[0048] Understandably, the telescopic cylinder 9 is generally installed in reverse, meaning that the piston rod of the telescopic cylinder 9 is connected to the frame, and the cylinder body is a telescopic moving part.

[0049] like Figure 1 and Figure 2 As shown, in this embodiment, a safety oil circuit is also provided between the connecting oil circuit 51 and the oil tank 73, and an overflow valve 72 is provided on the safety oil circuit.

[0050] The working principle of this system will be explained below with reference to the operation process of one embodiment. In this embodiment, both the reversing control valve 3 and the switching valve 42 are solenoid valves. The reversing control valve 3 is normally in the first working valve position, and the switching valve 42 is a normally open solenoid valve.

[0051] like Figure 1 and Figure 2 As shown, since the reversing control valve 3 is normally in the first working valve position, the switching valve 42 is normally open, and the system includes a bypass oil circuit 61 that bypasses the reversing control valve 3, when the system stops, the rod chambers of the arm pin cylinder 22 and the cylinder pin cylinder 21 can be unloaded through the unloading oil circuit 41. The arm pin cylinder 22 and the cylinder pin cylinder 21 are in the extended state when not in operation.

[0052] When the boom pin needs to be unlocked, the control hydraulic pump 11 starts, the control switch valve 42 is energized, and the control reversing control valve 3 is de-energized. At this time, the unloading oil circuit 41 is cut off, and the hydraulic oil output by the hydraulic pump 11 flows to the rod chamber of the boom pin cylinder 22, causing the boom pin cylinder 22 to pull the boom pin back.

[0053] When the boom pin needs to be locked, the control hydraulic pump 11 stops, the control switch valve 42 is de-energized, and the control directional control valve 3 is de-energized. At this time, the unloading oil circuit 41 is opened, the rod chamber of the boom pin cylinder 22 is unloaded, and under the action of the spring, the boom pin cylinder 22 will drive the boom pin to extend and lock.

[0054] When the cylinder pin needs to be unlocked, the hydraulic pump 11 is started, the control switch valve 42 is energized, and the control reversing valve 3 is energized. At this time, the unloading oil circuit 41 is cut off, and the hydraulic oil output by the hydraulic pump 11 flows to the rod chamber of the cylinder pin cylinder 21, causing the cylinder pin cylinder 21 to drive the cylinder pin to retract.

[0055] When the cylinder pin needs to be locked, the control hydraulic pump 11 stops, the control switch valve 42 is de-energized, and the control reversing control valve 3 is energized. At this time, the unloading oil circuit 41 is opened, the rod chamber of the cylinder pin cylinder 21 is unloaded, and under the action of the spring, the arm pin cylinder 22 will drive the cylinder pin to extend to lock.

[0056] To achieve the above objectives, this utility model also provides a telescopic boom, wherein the telescopic boom includes the single-cylinder pin control system described above. Since the telescopic boom adopts all the technical solutions of the above embodiments, it at least possesses the beneficial effects brought by the above embodiments, and will not be repeated here.

[0057] To achieve the above objectives, this utility model also provides a boom operation machine, wherein the boom operation machine includes a telescopic boom as described above. The boom operation machine can be a crane, aerial work platform, fire truck, work robot, or other machinery. Since the boom operation machine adopts all the technical solutions of the above embodiments, it at least possesses the beneficial effects brought by the above embodiments, and will not be repeated here.

[0058] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0059] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Although embodiments of the present invention have been described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A single-cylinder pin control system, characterized in that, The single-cylinder latch control system includes: Oil pump unit (1); The pin actuator includes a cylinder pin cylinder (21) and a lever pin cylinder (22). A reversing control valve (3) is connected to the oil pump port of the oil pump unit (1) via a connecting oil circuit (51). The reversing control valve (3) is also connected to the rod chamber of the cylinder pin cylinder (21) and the rod chamber of the arm pin cylinder (22). The reversing control valve (3) is used to control one of the rod chambers of the cylinder pin cylinder (21) and the arm pin cylinder (22) to be selectively connected to the oil pump port and to control the other to be cut off. The unloading oil passage (41) is used to unload oil from the rod chamber of the cylinder pin cylinder (21) and the arm pin cylinder (22). The unloading oil passage (41) is equipped with a switch valve (42).

2. The single-cylinder pin control system according to claim 1, characterized in that, One end of the unloading oil passage (41) is connected to the connecting oil passage (51), and the other end is connected to the oil tank (73).

3. The single-cylinder pin control system according to claim 1, characterized in that, The single-cylinder pin control system also includes a bypass oil passage (61) that bypasses the reversing control valve (3). One end of the bypass oil passage (61) is connected to the unloading oil passage (41), and the other end is connected to the rod chamber oil passage of the pin cylinder (21). A first check valve (62) is provided on the bypass oil passage (61). The first check valve (62) is used to control the rod chamber oil passage of the pin cylinder (21) to discharge oil unidirectionally to the connecting oil passage (51).

4. The single-cylinder pin control system according to claim 1, characterized in that, The connecting oil circuit (51) is provided with a second check valve (52). The second check valve (52) is configured to open when hydraulic oil flows from the pump port to the reversing control valve (3) and close in the reverse direction. One end of the unloading oil circuit (41) is connected to the connecting oil circuit (51) between the second check valve (52) and the reversing control valve (3), and the other end is connected to the oil tank (73).

5. The single-cylinder pin control system according to any one of claims 1 to 4, characterized in that, The reversing control valve (3) is a two-position three-way valve and is provided with an oil inlet (P), a first working oil port (A) and a second working oil port (B). The oil inlet (P) is used to connect to the pumping port of the oil pumping unit (1), the first working oil port (A) is used to connect to the rod chamber of the arm pin cylinder (22), and the second working oil port (B) is used to connect to the rod chamber of the cylinder pin cylinder (21). The reversing control valve (3) is further provided with a first working valve position and a second working valve position. In the first working valve position, the first working oil port (A) is connected to the oil inlet (P) and the second working oil port (B) is closed. In the second working valve position, the second working oil port (B) is connected to the oil inlet (P) and the first working oil port (A) is closed.

6. The single-cylinder pin control system according to any one of claims 1 to 4, characterized in that, The switching valve (42) is a two-position two-way valve with a shut-off valve position and a directional valve position. The directional valve position is the normal valve position, and the shut-off valve position is the directional valve position. The shut-off valve position is a one-way shut-off valve position. In the one-way shut-off valve position, when the hydraulic oil flows from the unloading oil passage (41) to the oil tank (73) near the rod chamber, it is shut off and reversed. Alternatively, the shut-off valve position may be a bidirectional shut-off valve position, in which the switching valve (42) is bidirectionally shut off.

7. The single-cylinder pin control system according to any one of claims 1 to 4, characterized in that, Pressure detection devices (71) are provided in the rod chamber oil lines of the cylinder pin cylinder (21) and / or arm pin cylinder (22).

8. The single-cylinder pin control system according to any one of claims 1 to 4, characterized in that, The oil pump unit (1) includes a hydraulic pump (11) and a motor (12) for driving the hydraulic pump (11) to operate. The motor (12) is driven by an external power source; or The oil pump unit (1) also includes a battery (83) for powering the motor (12).

9. A telescopic arm, characterized in that, Includes a telescopic hydraulic cylinder (9) and a single-cylinder pin control system as described in any one of claims 1 to 8; The single-cylinder pin control system includes an oil pump unit (1), a reversing control valve (3), a switching valve (42), a cylinder pin cylinder (21), and an arm pin cylinder (22), which are mounted on the cylinder body of the telescopic cylinder (9).

10. A boom-operated machine, characterized in that, Includes the telescopic arm as described in claim 9.

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