Bolt system, telescopic arm and operation machine

Abstract

The utility model relates to the technical field of engineering equipment, and provides a plug pin system, a telescopic arm and an operation machine.The plug pin system is arranged on a cylinder barrel of a telescopic oil cylinder and comprises a plurality of plug pin oil cylinders, a two-way pump and two working oil ways, and the two-way pump is provided with a first oil port and a second oil port; one end of one working oil way is connected with the first oil port, and one end of the other working oil way is connected with the second oil port; a rod cavity of at least one pin inserting and pulling oil cylinder is connected with one working oil way, and a rodless cavity of at least one pin inserting and pulling oil cylinder is connected with the other working oil way. The bolt system, the telescopic arm and the operation machine are good in reliability.

Description

Technical Field

[0001] The present application relates to the technical field of engineering equipment, and particularly relates to a pin system, a telescopic boom, and a working machine. Background Art

[0002] For a working machine such as a crane, its telescopic boom includes multiple boom sections, telescopic cylinders, and a pin system. The multiple boom sections are sleeved together to form the telescopic boom, and the telescopic cylinders are arranged inside the telescopic boom. Through the cooperation of the telescopic cylinders, cylinder pins, boom pins, and the pin system, the telescopic function of each boom section of the lifting boom is realized.

[0003] In the related art, the plugging and unplugging pin cylinder in the pin system adopts a single-acting cylinder, and a spring is arranged in the rodless cavity to complete the reset. This causes inevitable wear during work, affects the plugging and unplugging of the cylinder pins or boom pins, and has low reliability. Summary of the Utility Model

[0004] In view of this, the embodiments of the present application are expected to provide a pin system, a telescopic boom, and a working machine with high reliability.

[0005] To achieve the above object, the technical solution of the embodiments of the present application is realized as follows:

[0006] The embodiments of the present application provide a pin system. The pin system is arranged on the cylinder barrel of the telescopic cylinder, and the pin system includes:

[0007] Multiple plugging and unplugging pin cylinders;

[0008] A two-way pump having a first oil port and a second oil port;

[0009] Two working oil circuits, one end of one of the working oil circuits is connected to the first oil port, and one end of the other working oil circuit is connected to the second oil port;

[0010] The rodless cavity of at least one of the plugging and unplugging pin cylinders is connected to one of the working oil circuits, and the rodless cavity is connected to the other working oil circuit.

[0011] For the pin system provided by the embodiments of the present application, by arranging the plugging and unplugging pin cylinders, the two-way pump, and the two working oil circuits on the cylinder barrel of the telescopic cylinder, hydraulic oil can enter or flow out of the plugging and unplugging pin cylinders through the two-way pump via the working oil circuits, without the need for oil supply through a core tube. In this way, the core tube can be cancelled during the design and manufacture of the telescopic cylinder. On the one hand, not only can the volume of the telescopic cylinder be reduced, the structure is simple, but also the processing difficulty and manufacturing cost of the telescopic cylinder can be reduced; on the other hand, compared with the related art where oil is supplied through a core tube, by arranging the two-way pump and the working oil circuits on the cylinder barrel of the telescopic cylinder in the present application, the redundant design of the core tube can be cancelled, making the reliability and energy efficiency of the pin system higher.

[0012] By designing the plug-in and unplugging pin cylinder as a double-acting cylinder, that is, having a rod chamber and a rodless chamber, compared with the single-acting cylinder in the related art, the double-acting cylinder does not need to design a spring, so there is no need to consider the loss of the spring, the structure is simpler, and the reliability is higher. Description of the Drawings

[0013] Figure 1 It is the hydraulic schematic diagram of the pin system and the telescopic cylinder provided by the embodiment of the present application;

[0014] Figure 2 It is the hydraulic schematic diagram of the pin system, the telescopic cylinder, the drum, the first cable and the second cable provided by the embodiment of the present application.

[0015] Description of the Reference Numerals

[0016] 100, pin system; 11, plug-in and unplugging pin cylinder; 11a, arm pin plugging and unplugging cylinder; 11b, cylinder pin plugging and unplugging cylinder; 12, two-way pump; 12a, first oil port; 12b, second oil port; 13, working oil circuit; 13a, first working oil circuit; 13b, second working oil circuit; 14, motor; 15, control valve; 15a, first control valve; 15b, second control valve; 16, pressure sensor; 16a, first pressure sensor; 16b, second pressure sensor; 17, first relief valve; 18, first relief oil circuit; 19, second relief valve; 20, second relief oil circuit; 21, booster oil storage device; 22, first hydraulic check valve; 22a, pilot control port of the first hydraulic check valve; 23, first hydraulic control oil circuit; 24, second hydraulic check valve; 24a, pilot control port of the second hydraulic check valve; 25, second hydraulic control oil circuit; 200, telescopic cylinder; 201, cylinder barrel; 300, drum; 400, first cable; 500, second cable. Detailed Embodiments

[0017] It should be noted that, without conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other. The detailed description in the specific embodiments should be understood as an explanatory illustration of the purpose of the present application and should not be regarded as an improper limitation of the present application.

[0018] To better understand the pin system 100 provided by the present application, the telescopic arm will be described first.

[0019] On the one hand, the embodiment of the present application provides a telescopic arm. The telescopic arm includes a plurality of arm segments, arm pins, cylinder pins and a pin system 100. The pin system 100 is arranged on the telescopic cylinder 200. The arm segments are provided with arm pin holes and cylinder pin holes. The pin system 100 is used to control the plugging and unplugging of the arm pins and the cylinder pins. The cylinder pins can be inserted into the cylinder pin holes to lock the telescopic cylinder 200 with the arm segments, and the arm pins can be inserted into the arm pin holes to lock the arm segments.

[0020] When the cylinder pin is inserted into the cylinder pin hole, the telescopic oil cylinder 200 can be locked with the arm section. At this time, the cylinder pin is in the pin-inserted state. When the cylinder pin is pulled out of the cylinder pin hole, the telescopic oil cylinder 200 can be unlocked from the arm section. At this time, the cylinder pin is in the pin-pulled state. When the arm pin is inserted into the arm pin hole, the corresponding two arm sections can be locked. At this time, the arm pin is in the pin-inserted state. When the arm pin is pulled out of the arm pin hole, the corresponding two arm sections can be unlocked. At this time, the arm pin is in the pin-pulled state.

[0021] In some related technologies, the pin-pulling and inserting oil cylinder adopts a single-acting oil cylinder. By setting a spring in its rodless cavity, the reset function is completed relying on the elastic performance of the spring. On the one hand, the spring will inevitably wear during operation, resulting in a decrease in its elastic performance, which will in turn affect the pin-pulling and inserting work of the arm pin or cylinder pin, and the reliability becomes lower. On the other hand, the reset by the spring has certain requirements for the installation position or space of the spring. For example, the space in the end arm section of the telescopic arm is limited, which will bring inconvenience to the arrangement of the spring and increase the manufacturing difficulty. On the third hand, in order to meet the pin-pulling and inserting reliability of the pin-pulling and inserting oil cylinder, the spring stiffness inside it is generally designed to be relatively large, which makes the reset force received by the arm pin or cylinder pin also become larger. Then, when the arm pin or cylinder pin is completely released, it will generate a strong impact on the seat body of the pin-pulling and inserting oil cylinder, thereby causing noise and even possibly damaging the seat body structure. In view of this situation, in related technologies, damping cylinders are often added or overflow valves are set to adjust the unloading back pressure of the cylinder pin or arm pin and other methods for buffering, which undoubtedly increases the complexity of the pin-inserting system. On the fourth hand, the pin-pulling and inserting oil cylinder adopts a single-acting oil cylinder. When maintaining the arm pin or cylinder pin in the pin-pulled state, it is necessary to maintain the outlet pressure of the hydraulic pump, and then it is necessary to maintain the hydraulic oil pressure in the rodless cavity of the pin-pulling and inserting oil cylinder to offset the deformation of the spring. However, this will cause the hydraulic pump to be in the overflow state for a long time, resulting in an increase in its temperature, which will in turn affect the service life of the hydraulic pump.

[0022] In some other related technologies, a core tube is arranged in the telescopic oil cylinder, and then the hydraulic oil in the common oil tank of the crane is pumped to the pin-pulling and inserting oil cylinder through the core tube by a hydraulic pump. This setting method, on the one hand, makes the telescopic oil cylinder more difficult to process and larger in size due to the core tube, and the structure becomes more complex; on the other hand, the core tube is generally a slender tube, which reduces the passing efficiency of the hydraulic oil, resulting in a slower response and a larger power loss of the pin-inserting system. Moreover, long-term introduction of high-pressure hydraulic oil will cause the core tube to deform and the reliability to decrease; on the third hand, when the telescopic oil cylinder moves, the internal cavity volume communicated with the core tube will change, thereby causing a pressure change inside the core tube. For example, when the telescopic arm extends, the pressure inside the core tube decreases, and at this time, there may be a risk of reset of the cylinder pin or arm pin. When the telescopic arm retracts, the pressure inside the core tube increases, and at this time, the core tube may be damaged.

[0023] In view of this, on the other hand, an embodiment of the present application provides a pin system. Please refer to Figure 1 and Figure 2 , the pin system 100 is arranged on the cylinder barrel 201 of the telescopic oil cylinder 200. The pin system 100 includes a plurality of pin insertion / extraction oil cylinders 11, a two-way pump 12, and two working oil circuits 13. The two-way pump 12 has a first oil port 12a and a second oil port 12b. One end of one of the working oil circuits 13 is connected to the first oil port 12a, and one end of the other working oil circuit 13 is connected to the second oil port 12b. The rod chamber of at least one pin insertion / extraction oil cylinder 11 is connected to one of the working oil circuits 13, and the rodless chamber is connected to the other working oil circuit 13.

[0024] For the convenience of description, the two working oil circuits can be respectively denoted as the first working oil circuit 13a and the second working oil circuit 13b. The first oil port 12a is connected to the first working oil circuit 13a, and the second oil port 12b is connected to the second working oil circuit 13b.

[0025] It should be noted that the rod chamber of at least one pin insertion / extraction oil cylinder 11 is connected to one of the working oil circuits 13, and the rodless chamber is connected to the other working oil circuit 13 means that: the rod chamber of at least one pin insertion / extraction oil cylinder 11 among the plurality of pin insertion / extraction oil cylinders 11 is connected to one of the working oil circuits 13, and the rodless chamber of the same pin insertion / extraction oil cylinder 11 is connected to the other working oil circuit 13, and the rod chambers and rodless chambers of the other pin insertion / extraction oil cylinders 11 may be connected to the working oil circuit 13 in the same or different ways as that of the above-mentioned pin insertion / extraction oil cylinder 11.

[0026] The two-way pump 12 refers to a pump that can rotate forward or backward to supply oil to two different working oil circuits 13. It can be understood that by switching the rotation direction of the two-way pump 12, the functions of the first oil port 12a and the second oil port 12b are switched between oil supply and oil return. Specifically, when the first oil port 12a is the oil outlet of the two-way pump 12, the second oil port 12b is the oil return port of the two-way pump 12. After switching the rotation direction of the two-way pump 12, the first oil port 12a becomes the oil return port of the two-way pump 12, and the second oil port 12b is the oil outlet of the two-way pump 12.

[0027] It should be noted that the forward rotation state and the reverse rotation state of the two-way pump 12 are to distinguish the opposite rotation directions in the two states, rather than specific rotation directions.

[0028] When the two-way pump 12 is in the forward rotation or reverse rotation state, the two-way pump 12 can transport the hydraulic oil in one of the working oil circuits 13 to the other working oil circuit 13, so that the hydraulic oil can enter the pin insertion / extraction oil cylinder 11 communicated with it to perform pin insertion or pin extraction work.

[0029] The pin insertion and extraction system 100 provided by the embodiment of the present application has the plugging and unplugging pin oil cylinder 11, the two-way pump 12, and the two working oil circuits 13 all arranged on the cylinder barrel 201 of the telescopic oil cylinder 200. Hydraulic oil can enter or flow out of the plugging and unplugging pin oil cylinder 11 through the two-way pump 12 via the working oil circuit 13, without the need for oil supply through a core tube. In this way, the core tube can be eliminated when the telescopic oil cylinder 200 is designed and manufactured. On the one hand, not only can the volume of the telescopic oil cylinder 200 be reduced, the structure is simple, but also the processing difficulty and manufacturing cost of the telescopic oil cylinder 200 can be reduced; on the other hand, compared with the related art where oil is supplied through a core tube, in the present application, by arranging the two-way pump 12 and the working oil circuit 13 on the cylinder barrel 201 of the telescopic oil cylinder 200, the redundant design of the core tube can be eliminated, making the reliability and energy efficiency of the pin insertion and extraction system 100 higher.

[0030] In the embodiment of the present application, the plugging and unplugging pin oil cylinder 11 is designed as a double-acting oil cylinder, that is, it has a rodless cavity and a rod cavity. Compared with the single-acting oil cylinder in the related art, the double-acting oil cylinder does not need to be designed with a spring, so there is no need to consider the loss of the spring, the structure is simpler, and the reliability is higher.

[0031] The telescopic arm provided by the embodiment of the present application has the pin insertion and extraction system 100 arranged on the telescopic oil cylinder 200 to control the cylinder pin to be inserted into the cylinder pin hole to lock the telescopic oil cylinder 200 and the arm section, and the arm pin to be inserted into the arm pin hole to lock the arm section. Moreover, with the coreless tube design of the telescopic oil cylinder 200 and the double-acting oil cylinder design of the plugging and unplugging pin oil cylinder 11, the telescopic reliability and integration degree of the telescopic arm are increased, and the size, noise, processing difficulty, and manufacturing cost are reduced.

[0032] In one embodiment, please refer to Figure 1 and Figure 2 , the above-mentioned multiple plugging and unplugging pin oil cylinders 11 include an arm pin plugging and unplugging oil cylinder 11a and a cylinder pin plugging and unplugging oil cylinder 11b. That is to say, one of the multiple plugging and unplugging pin oil cylinders 11 is the arm pin plugging and unplugging oil cylinder 11a, and the other plugging and unplugging pin oil cylinder 11 is the cylinder pin plugging and unplugging oil cylinder 11b.

[0033] The arm pin plugging and unplugging oil cylinder 11a and the cylinder pin plugging and unplugging oil cylinder 11b are arranged in parallel between the two working oil circuits 13. The rodless cavity of the arm pin plugging and unplugging oil cylinder 11a and the rod cavity of the cylinder pin plugging and unplugging oil cylinder 11b are both connected to one of the working oil circuits 13 (the first working oil circuit 13a), and the rod cavity of the arm pin plugging and unplugging oil cylinder 11a and the rodless cavity of the cylinder pin plugging and unplugging oil cylinder 11b are both connected to the other working oil circuit 13 (the second working oil circuit 13b).

[0034] Exemplarily, when the two-way pump 12 is in the forward rotation state, the hydraulic oil can flow out from the first oil port 12a, and then enter the rodless cavity of the arm pin insertion / extraction cylinder 11a and / or the rod cavity of the cylinder pin insertion / extraction cylinder 11b through the corresponding working oil circuit 13, so as to insert the arm pin and / or extract the cylinder pin, while the hydraulic oil in the rod cavity of the arm pin insertion / extraction cylinder 11a and / or the rodless cavity of the cylinder pin insertion / extraction cylinder 11b can flow back to the second oil port 12b through another working oil circuit 13 for oil replenishment;

[0035] When the two-way pump 12 is in the reverse rotation state, the hydraulic oil can flow out from the second oil port 12b, and then enter the rod cavity of the arm pin insertion / extraction cylinder 11a and / or the rodless cavity of the cylinder pin insertion / extraction cylinder 11b through the corresponding working oil circuit 13, so as to extract the arm pin and / or insert the cylinder pin, while the hydraulic oil in the rodless cavity of the arm pin insertion / extraction cylinder 11a and / or the rod cavity of the cylinder pin insertion / extraction cylinder 11b can flow back to the first oil port 12a through another working oil circuit 13 for replenishment.

[0036] That is to say, after the oil circuit inside the pin insertion system 100 provided in the present application is filled with hydraulic oil before leaving the factory, an additional hydraulic oil source can be not required subsequently, forming a closed system with high reliability.

[0037] Here, by arranging the arm pin insertion / extraction cylinder 11a and the cylinder pin insertion / extraction cylinder 11b in parallel between the two working oil circuits 13, the rodless cavity of the arm pin insertion / extraction cylinder 11a and the rod cavity of the cylinder pin insertion / extraction cylinder 11b are both connected to one of the working oil circuits 13, and the rod cavity of the arm pin insertion / extraction cylinder 11a and the rodless cavity of the cylinder pin insertion / extraction cylinder 11b are both connected to the other working oil circuit 13. In this way, the cylinder pin can be extracted, the cylinder pin can be inserted, the arm pin can be extracted, and the arm pin can be inserted, with fast response and high efficiency. Even if the two-way pump 12 supplies oil to the arm pin insertion / extraction cylinder 11a and the cylinder pin insertion / extraction cylinder 11b simultaneously, only the situation of extracting the cylinder pin and inserting the arm pin or inserting the cylinder pin and extracting the arm pin will occur, and the situation of extracting both the cylinder pin and the arm pin will not occur, with good safety.

[0038] Exemplarily, in one embodiment, please refer to Figure 1, the two-way pump 12 is configured with a motor 14, and the rotation direction of the two-way pump 12 is controlled by the motor 14. In this way, the telescopic movements of the cylinder pin insertion / extraction oil cylinder 11b and the arm pin insertion / extraction oil cylinder 11a can be controlled by adjusting the rotation direction of the two-way pump 12 by controlling the motor 14. The flow rate of the oil outlet of the two-way pump 12 can also be controlled by controlling the rotation speed of the motor 14, and further, the telescopic speed of the cylinder pin insertion / extraction oil cylinder 11b and the arm pin insertion / extraction oil cylinder 11a can be controlled. Even the output force of the cylinder pin insertion / extraction oil cylinder 11b and the arm pin insertion / extraction oil cylinder 11a can be controlled by controlling the torque of the motor 14. During the insertion and extraction of the cylinder pin and the arm pin, by controlling the telescopic speed and the output force of the cylinder pin insertion / extraction oil cylinder 11b and the arm pin insertion / extraction oil cylinder 11a, the wear, impact and noise of the pin insertion system 100 can be effectively reduced, the efficiency of inserting and extracting the cylinder pin and the arm pin can be improved, and it is beneficial for the pin insertion system 100 to adapt to new energy forms of working machinery such as pure electric and plug-in hybrid.

[0039] In one embodiment, please refer to Figure 1 , the pin insertion system 100 further includes a control valve 15. The control valve 15 is used to conduct the oil circuit between one of the working oil circuits 13 and the rodless cavity of the pin insertion / extraction oil cylinder 11 and conduct the oil circuit between the other working oil circuit 13 and the rod cavity of the pin insertion / extraction oil cylinder 11, or disconnect the oil circuit between one of the working oil circuits 13 and the rodless cavity of the pin insertion / extraction oil cylinder 11 and disconnect the oil circuit between the other working oil circuit 13 and the rod cavity of the pin insertion / extraction oil cylinder 11.

[0040] Here, by setting the on / off of the two working oil circuits 13 and the rodless cavity and the rod cavity of the pin insertion / extraction oil cylinder 11 through the control valve 15, on the one hand, the insertion and extraction of the arm pin and the cylinder pin can be accurately controlled, and the controllability is high; on the other hand, by setting the control valve 15, the corresponding oil circuit can be conducted only according to the needs of inserting and extracting the arm pin or the cylinder pin. In this way, unnecessary energy consumption can be reduced to improve the insertion / extraction efficiency.

[0041] Exemplarily, in another embodiment, please refer to Figure 1 , the control valve 15 includes a first control valve 15a and a second control valve 15b.

[0042] The first control valve 15a can be used to conduct or cut off the oil circuit between the first working oil circuit 13a and the rod chamber of the cylinder pin insertion / extraction oil cylinder 11b, and to conduct or cut off the oil circuit between the second working oil circuit 13b and the rodless chamber of the cylinder pin insertion / extraction oil cylinder 11b. The second control valve 15b can be used to conduct or cut off the oil circuit between the first working oil circuit 13a and the rodless chamber of the arm pin insertion / extraction oil cylinder 11a, and to conduct or cut off the oil circuit between the second working oil circuit 13b and the rod chamber of the arm pin insertion / extraction oil cylinder 11a. In this way, by independently controlling the on / off of the corresponding cylinder pin insertion / extraction oil cylinder 11b and arm pin insertion / extraction oil cylinder 11a through the first control valve 15a and the second control valve 15b respectively, the control mode of the oil circuit is more diverse and the control precision is higher. Even if the first control valve 15a and the second control valve 15b are opened simultaneously, the cylinder pin and the arm pin will not be extracted at the same time, reducing the occurrence of accidental detachment of the arm section and having good safety performance.

[0043] In some embodiments, the control valve 15 can be an integrated valve, and the above-mentioned oil circuit control is achieved by switching different working positions of the control valve 15.

[0044] In one embodiment, please refer to Figure 1 , the control valve 15 is a two-position two-way solenoid valve. Exemplarily, the first control valve 15a has a P port, a T port, an A port, and a B port. One of the P port and the T port is an inlet, and the other of the P port and the T port is an outlet. The A port and the B port are two working ports. The P port is connected to the first working oil circuit 13a, the T port is connected to the second working oil circuit 13b, the A port is connected to the rod chamber of the cylinder pin insertion / extraction oil cylinder 11b, and the B port is connected to the rodless chamber of the cylinder pin insertion / extraction oil cylinder 11b. The first control valve 15a has a connected position and a disconnected position. When the first control valve 15a is in the disconnected position, the P port is disconnected from the A port, and the B port is disconnected from the T port. When the first control valve 15a is in the connected position, the P port is connected to the A port, and the B port is connected to the T port. In this way, the first control valve 15a can be made to be in one of the connected position and the disconnected position through an electrical signal, with high automation and fast response. Exemplarily, the second control valve 15b also has a P port, a T port, an A port, and a B port. The P port of the second control valve 15b is connected to the P port of the first control valve 15a, the T port of the second control valve 15b is connected to the T port of the first control valve 15a, the A port of the second control valve 15b is connected to the rodless chamber of the arm pin insertion / extraction oil cylinder 11a, and the B port of the second control valve 15b is connected to the rod chamber of the arm pin insertion / extraction oil cylinder 11a. In this way, when both the first control valve 15a and the second control valve 15b are in the connected position, one of the arm pin and the cylinder pin can be in the pin extraction state, and the other of the arm pin and the cylinder pin can be in the pin insertion state, with good safety performance. Of course, in order to better insert or extract the arm pin or the cylinder pin, one of the first control valve 15a and the second control valve 15b can be made to be in the disconnected position and the other in the connected position according to needs, with higher control precision.

[0045] In one embodiment, please refer to Figure 1 , the pin system 100 includes a pressure sensor 16, and an oil path between the rodless chamber of the pin insertion / extraction cylinder 11 and the control valve 15 is connected to the pressure sensor 16.

[0046] Exemplarily, the pressure sensor 16 can be arranged on the oil path between the rodless chamber of the cylinder pin insertion / extraction cylinder 11b and the control valve 15. In this way, when the cylinder pin is inserted into the cylinder pin hole to lock the telescopic cylinder 200 with the arm section, the pressure sensor 16 can monitor the pressure value in the rodless chamber of the cylinder pin insertion / extraction cylinder 11b in real time. If the pressure value is less than the set value, it indicates that there may be risks such as leakage in the pin system 100. At this time, an alarm message can be sent to remind the operator to perform maintenance and inspection, so as to improve the fault detection ability of the pin system 100. The pressure sensor 16 can also be arranged on the oil path between the rodless chamber of the cylinder pin insertion / extraction cylinder 11b and the control valve 15.

[0047] Exemplarily, in one embodiment, the alarm message can be sound and / or light.

[0048] Exemplarily, in one embodiment, please refer to Figure 1 , the number of the pressure sensors 16 can be two. The two pressure sensors 16 are respectively a first pressure sensor 16a and a second pressure sensor 16b. The first pressure sensor 16a can be arranged between the rodless chamber of the cylinder pin insertion / extraction cylinder 11b and the first control valve 15a, and the second pressure sensor 16b can be arranged between the rodless chamber of the arm pin insertion / extraction cylinder 11a and the second control valve 15b. In this way, both the rodless chamber of the cylinder pin insertion / extraction cylinder 11b and the rodless chamber of the arm pin insertion / extraction cylinder 11a are monitored by the pressure sensor 16, so as to further improve the fault detection ability of the pin system 100.

[0049] The pin system 100 includes a first overflow valve 17 and a first overflow oil path 18. The first overflow oil path 18 is connected to the first working oil path 13a and the second working oil path 13b. The first overflow valve 17 is arranged on the first overflow oil path 18 and its outlet communicates with the second working oil path 13b.

[0050] Here, when the pressure in the first working oil path 13a is greater than the opening pressure of the first overflow valve 17, at this time, the first overflow valve 17 will open, so that the inlet of the first overflow valve 17 communicates with its outlet. In this way, the excess hydraulic oil in the first working oil path 13a can flow through the first overflow oil path 18 through the first overflow valve 17 to the second working oil path 13b. On the one hand, the hydraulic oil in the first working oil path 13a can be depressurized to limit the maximum pressure in the first working oil path 13a, with high safety; on the other hand, the second oil port 12b can be refilled through the second working oil path 13b to ensure sufficient oil absorption.

[0051] In one embodiment, please refer toFigure 1 The latch system 100 includes a second relief valve 19 and a second relief oil passage 20. The second relief oil passage 20 communicates with the first working oil passage 13a and the second working oil passage 13b. The second relief valve 19 is disposed in the second relief oil passage 20 and its outlet communicates with the first working oil passage 13a.

[0052] Here, when the pressure in the second working oil passage 13b is greater than the opening pressure of the second relief valve 19, at this time, the second relief valve 19 will open, so that the inlet and the outlet of the second relief valve 19 are communicated. In this way, the redundant hydraulic oil in the second working oil passage 13b can flow through the second relief oil passage 20 through the second relief valve 19 to the first working oil passage 13a. On the one hand, the hydraulic oil in the second working oil passage 13b can be relieved to limit the maximum pressure in the second working oil passage 13b, with high safety; on the other hand, the first oil port 12a can be refilled through the first working oil passage 13a to ensure sufficient oil absorption.

[0053] In one embodiment, please refer to Figure 1 The latch system 100 includes a first relief valve 17, a first relief oil passage 18, a second relief valve 19 and a second relief oil passage 20. The first relief oil passage 18 connects the first working oil passage 13a and the second working oil passage 13b. The first relief valve 17 is disposed in the first relief oil passage 18 and its outlet communicates with the second working oil passage 13b. The second relief oil passage 20 communicates with the first working oil passage 13a and the second working oil passage 13b. The second relief valve 19 is disposed in the second relief oil passage 20 and its outlet communicates with the first working oil passage 13a.

[0054] In this way, the maximum pressure of the latch system 100 can be limited, and the safety is higher.

[0055] In one embodiment, please refer to Figure 1 The latch system 100 includes a pressurized oil storage device 21 with an inlet and an outlet, a first hydraulic check valve 22 and a first hydraulic control oil passage 23. The first hydraulic control oil passage 23 communicates with the first working oil passage 13a and the inlet and outlet. The first hydraulic check valve 22 is disposed in the first hydraulic control oil passage 23. The inlet of the first hydraulic check valve 22 communicates with the inlet and outlet. The pilot control port 22a of the first hydraulic check valve communicates with the second working oil passage 13b.

[0056] When the two-way pump 12 rotates in reverse, the second oil port 12b is the oil outlet, and the first oil port 12a is the oil return port. When the pressure in the second working oil circuit 13b is greater than the opening pressure of the pilot control port 22a of the first hydraulic control check valve, the inlet and the outlet of the first hydraulic control check valve 22 are connected. At this time, if the pressure in the first working oil circuit 13a is greater than the pressure in the pressurized oil storage device 21, the excess hydraulic oil in the first working oil circuit 13a can enter the pressurized oil storage device 21 through the first hydraulic control oil circuit 23 and the first hydraulic control check valve 22 for storage. When the pressure in the first working oil circuit 13a is less than the pressure in the pressurized oil storage device 21, the hydraulic oil in the pressurized oil storage device 21 can flow into the first working oil circuit 13a through its inlet and outlet, the first hydraulic control check valve 22, and the first hydraulic control oil circuit 23 to replenish the oil at the first oil port 12a to ensure sufficient oil supply.

[0057] In one embodiment, please refer to Figure 1 , the pin system 100 includes a pressurized oil storage device 21 with an inlet and an outlet, a second hydraulic control check valve 24, and a second hydraulic control oil circuit 25. The second hydraulic control oil circuit 25 connects the second working oil circuit 13b and the inlet and outlet. The second hydraulic control check valve 24 is arranged in the second hydraulic control oil circuit 25. The inlet of the second hydraulic control check valve 24 is connected to the inlet and outlet, and the pilot control port 24a of the second hydraulic control check valve is connected to the first working oil circuit 13a.

[0058] When the two-way pump 12 rotates forward, the first oil port 12a is the oil outlet, and the second oil port 12b is the oil return port. When the pressure in the first working oil circuit 13a is greater than the opening pressure of the pilot control port 24a of the second hydraulic control check valve, the inlet and the outlet of the second hydraulic control check valve 24 are connected. At this time, if the pressure in the second working oil circuit 13b is greater than the pressure in the pressurized oil storage device 21, the excess hydraulic oil in the second working oil circuit 13b can enter the pressurized oil storage device 21 through the second hydraulic control oil circuit 25 and the second hydraulic control check valve 24 for storage. When the pressure in the second working oil circuit 13b is less than the pressure in the pressurized oil storage device 21, at this time, the hydraulic oil in the pressurized oil storage device 21 can flow into the second working oil circuit 13b through its inlet and outlet, the second hydraulic control check valve 24, and the second hydraulic control oil circuit 25 to replenish the oil at the second oil port 12b to ensure sufficient oil supply.

[0059] It should be noted that the forward rotation here can be the counterclockwise rotation of the two-way pump, and the reverse rotation can be the clockwise rotation of the two-way pump.

[0060] It should be noted that one of the reasons for the generation of excess hydraulic oil in the first working oil circuit 13a and the second working oil circuit 13b here is that the volume of the rodless chamber of the pin inserting and pulling cylinder 11 is larger than that of its rod chamber; taking the cylinder pin inserting and pulling cylinder 11b as an example, when hydraulic oil is filled into the rod chamber to retract its piston rod into the cylinder pin inserting and pulling cylinder 11b so as to drive the cylinder pin out of the cylinder pin hole, due to the larger volume of the rodless chamber, the amount of hydraulic oil filled into the rod chamber is less than the amount of discharged hydraulic oil. Since each oil circuit is filled with hydraulic oil, in this way, a part can be temporarily stored in the pressure boosting oil storage device 21, and the other part flows back for circulating oil replenishment; if it is necessary to drive the cylinder pin to insert into the cylinder pin hole, then more hydraulic oil needs to be filled into the rodless chamber, so that the piston rod in the cylinder pin inserting and pulling cylinder 11b extends, thereby driving the cylinder pin to insert into the cylinder pin hole. Since the discharged hydraulic oil from the rod chamber is less, the hydraulic oil circulated to the bi-directional pump 12 cannot meet the oil replenishment requirement. At this time, the hydraulic oil in the pressure boosting oil storage device 21 can supplement it to ensure sufficient oil suction of the bi-directional pump 12.

[0061] In one embodiment, please refer to Figure 1 , the pin inserting system 100 includes a pressure boosting oil storage device 21 with an inlet and an outlet, a first pilot-operated check valve 22, a first pilot-operated oil circuit 23, a second pilot-operated check valve 24 and a second pilot-operated oil circuit 25. The first pilot-operated oil circuit 23 communicates with the first working oil circuit 13a and the inlet and outlet. The first pilot-operated check valve 22 is arranged in the first pilot-operated oil circuit 23. The inlet of the first pilot-operated check valve 22 communicates with the inlet and outlet. The pilot control port 22a of the first pilot-operated check valve communicates with the second working oil circuit 13b. The second pilot-operated oil circuit 25 communicates with the second working oil circuit 13b and the inlet and outlet. The second pilot-operated check valve 24 is arranged in the second pilot-operated oil circuit 25. The inlet of the second pilot-operated check valve 24 communicates with the inlet and outlet. The pilot control port 24a of the second pilot-operated check valve communicates with the first working oil circuit 13a. In this way, no matter whether the first oil port 12a or the second oil port 12b is used for oil outlet, sufficient oil supply can be ensured.

[0062] In one embodiment, the pressure boosting oil storage device 21 includes one of a pressure boosting oil tank, an accumulator, a bladder pressure boosting device and a spring pressure boosting device. In this way, a certain amount of hydraulic oil can be stored and the hydraulic oil can be output.

[0063] Another aspect of the embodiment of the present application provides a working machine, and the working machine includes the telescopic boom in the above embodiment. Based on the advantages of the telescopic boom described above, the working machine provided by the embodiment of the present application has the advantages of simple structure, high reliability of telescopic movement of the telescopic boom and low manufacturing cost.

[0064] Exemplarily, in one embodiment, the working machine can be a crane, an aerial work machine or a fire truck, etc.

[0065] In one embodiment, please refer to Figure 2, the construction machine includes a cable drum 300 and a first cable 400. The first cable 400 is used to supply power to the two-way pump 12, and the cable drum 300 is used to wind the first cable 400.

[0066] Exemplarily, the construction machine includes a second cable 500. The cable drum 300 can be arranged on the telescopic boom. The first cable 400 can be electrically connected to the control valve 15 and the motor 14, and the second cable 500 can be electrically connected to the electrical components on the boom section. Both the first cable 400 and the second cable 500 can be wound and arranged in the cable drum 300 for storage. In this way, the first cable 400 and the second cable 500 can be protected to a certain extent, and the service life of the first cable 400 and the second cable 500 can be prolonged.

[0067] Exemplarily, in one embodiment, the construction machine further includes a control device and a power source. The power source and the control device are electrically connected to the control valve 15 and the motor 14 through the first cable 400. In this way, only by remotely supplying power to the control valve 15 and the motor 14 and sending control instructions can the pin system 100 be actuated.

[0068] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various modifications and changes can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A latch system, characterized in that: Arranged on a cylinder barrel (201) of a telescopic oil cylinder (200), the latch system (100) comprises: A plurality of plug-in and pull-out pin cylinders (11); A bidirectional pump (12) having a first oil port (12a) and a second oil port (12b); Two working oil circuits (13), one end of one of the working oil circuits (13) being connected to the first oil port (12a), and one end of the other working oil circuit (13) being connected to the second oil port (12b); The rod chamber of at least one of the pin plugging and pulling cylinders (11) is connected to one of the working oil circuits (13), and the rodless chamber is connected to the other working oil circuit (13).

2. The latch system according to claim 1, characterized in that: The multiple pin plugging and pulling cylinders (11) include an arm pin plugging and pulling cylinder (11a) and a cylinder pin plugging and pulling cylinder (11b). The arm pin plugging and pulling cylinder (11a) and the cylinder pin plugging and pulling cylinder (11b) are arranged in parallel between the two working oil circuits (13). The rodless chamber of the arm pin plugging and pulling cylinder (11a) and the rod chamber of the cylinder pin plugging and pulling cylinder (11b) are both connected to one of the working oil circuits (13), and the rod chamber of the arm pin plugging and pulling cylinder (11a) and the rodless chamber of the cylinder pin plugging and pulling cylinder (11b) are both connected to the other of the working oil circuits (13).

3. The latch system according to claim 1, characterized in that: The latch system (100) further comprises a control valve (15), wherein the control valve (15) is used to open the oil circuit between one of the working oil circuits (13) and the rodless chamber of the plug-in pin oil cylinder (11) and open the oil circuit between the other working oil circuit (13) and the rod chamber of the plug-in pin oil cylinder (11), or to disconnect the oil circuit between one of the working oil circuits (13) and the rodless chamber of the plug-in pin oil cylinder (11) and disconnect the oil circuit between the other working oil circuit (13) and the rod chamber of the plug-in pin oil cylinder (11).

4. The latch system according to claim 3, characterized in that: The latch system (100) comprises a pressure sensor (16), and the oil circuit between the rodless chamber of the latch cylinder (11) and the control valve (15) is connected to the pressure sensor (16).

5. The latch system according to claim 1, characterized in that: The two working oil passages (13) are respectively a first working oil passage (13a) and a second working oil passage (13b); The latch system (100) comprises a first overflow valve (17) and a first overflow oil circuit (18), wherein the first overflow oil circuit (18) connects the first working oil circuit (13a) and the second working oil circuit (13b), and the first overflow valve (17) is arranged in the first overflow oil circuit (18) and its outlet is connected to the second working oil circuit (13b); and / or, The latch system (100) comprises a second overflow valve (19) and a second overflow oil circuit (20), wherein the second overflow oil circuit (20) is connected to the first working oil circuit (13a) and the second working oil circuit (13b), and the second overflow valve (19) is arranged in the second overflow oil circuit (20) and its outlet is connected to the first working oil circuit (13a).

6. The latch system according to claim 5, characterized in that: The latch system (100) comprises a pressurized oil storage device (21) having an inlet and an outlet, a first hydraulically controlled one-way valve (22) and a first hydraulically controlled oil circuit (23), wherein the first hydraulically controlled oil circuit (23) is connected to the first working oil circuit (13a) and the inlet and the outlet, the first hydraulically controlled one-way valve (22) is arranged in the first hydraulically controlled oil circuit (23), the inlet of the first hydraulically controlled one-way valve (22) is connected to the inlet and the outlet, and the pilot control port (22a) of the first hydraulically controlled one-way valve is connected to the second working oil circuit (13b); and / or, The latch system (100) comprises a pressurized oil storage device (21) having an inlet and an outlet, a second hydraulically controlled one-way valve (24) and a second hydraulically controlled oil circuit (25), wherein the second hydraulically controlled oil circuit (25) is connected to the second working oil circuit (13b) and the inlet and the outlet, the second hydraulically controlled one-way valve (24) is arranged in the second hydraulically controlled oil circuit (25), the inlet of the second hydraulically controlled one-way valve (24) is connected to the inlet and the outlet, and the pilot control port (24a) of the second hydraulically controlled one-way valve is connected to the first working oil circuit (13a).

7. The latch system according to claim 5 or 6, characterized in that: The pressurized oil storage device (21) comprises a pressurized oil tank, an accumulator, a bladder pressurizing device and a spring pressurizing device.

8. A telescopic arm, characterized in that: The telescopic arm comprises a plurality of arm sections, an arm pin, a cylinder pin and a latch system (100) as described in any one of claims 1 to 7, wherein the latch system (100) is arranged on the telescopic cylinder (200), and the arm section is provided with an arm pin hole and a cylinder pin hole, and the latch system (100) is used to control the insertion and extraction of the arm pin and the insertion and extraction of the cylinder pin, and the cylinder pin can be inserted into the cylinder pin hole to lock the telescopic cylinder (200) with the arm section, and the arm pin can be inserted into the arm pin hole to lock the arm section.

9. A working machine, characterized in that: The working machine includes the telescopic arm as claimed in claim 8.

10. The working machine according to claim 9, characterized in that: The working machine comprises a reel (300) and a first cable (400), wherein the first cable (400) is used to supply power to the bidirectional pump (12), and the reel (300) is used to wind up the first cable (400).

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