Boom bolt system, telescopic boom and operation machine

Abstract

The embodiment of the utility model provides a boom bolt system, telescopic boom and operating machinery, boom bolt system includes telescopic oil cylinder, boom pin drive oil cylinder, cylinder pin drive oil cylinder, two-way pump, boom pin working oil way and cylinder pin working oil way, telescopic oil cylinder is used for driving telescopic boom to stretch out and draw back, boom pin drive oil cylinder is used for driving boom pin to insert and draw pin; the cylinder pin driving oil cylinder is used for driving the cylinder pin inserting and pulling pin; the arm pin driving oil cylinder, the cylinder pin driving oil cylinder and the two-way pump are all arranged on a cylinder barrel of the telescopic oil cylinder. The two-way pump has a forward rotation state and a reverse rotation state; in the forward rotation state, the two-way pump extracts hydraulic oil from the cylinder pin working oil way cylinder pin driving oil cylinder and conveys the hydraulic oil to the arm pin working oil way arm pin driving oil cylinder. And in the reverse rotation state, the two-way pump extracts the hydraulic oil from the arm pin driving oil cylinder of the arm pin working oil way and conveys the hydraulic oil to the cylinder pin driving oil cylinder of the cylinder pin working oil way. According to the boom bolt system in the embodiment of the utility model, the change of the flow direction of hydraulic oil is realized by directly utilizing the change of the rotation direction of the two-way pump.

Description

Technical Field

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

[0002] The telescopic boom of a boom-type working machine includes multiple boom sections, a telescopic oil cylinder, and a boom pin system. The multiple boom sections are sleeved together, and the telescopic oil cylinder is arranged inside the boom section. A cylinder pin is arranged on the cylinder barrel of the telescopic oil cylinder, and a boom pin is arranged on the boom section. By using the telescopic movement of the telescopic oil cylinder and the pin insertion and extraction actions of the cylinder pin and the boom pin, different boom sections can be driven to displace respectively to achieve the telescoping of the telescopic boom. Among them, by controlling the boom pin driving oil cylinder and the cylinder pin driving oil cylinder in the boom pin system, the boom pin and the cylinder pin are respectively driven to perform pin insertion and extraction actions.

[0003] A reversing valve is arranged on the oil path at the outlet of the oil pump, and the reversing valve is used to switch the flow direction of the hydraulic oil in the oil path to achieve the alternating control of the boom pin driving oil cylinder and the cylinder pin driving oil cylinder.

[0004] In this solution, under extreme working conditions such as low temperature, due to the viscosity of the hydraulic oil, the switching valve may have a delay or even cannot be switched, which may lead to problems such as abnormal pin extraction. In addition, when the reversing valve leaks, problems such as abnormal pin extraction are also likely to occur. This has an adverse impact on the normal operation and use safety of the working machine. Summary of the Utility Model

[0005] In view of this, the embodiments of the present application are expected to provide a boom pin system, a telescopic boom, and a working machine, which can improve the response speed of hydraulic oil commutation and the adaptability of the hydraulic system under different working conditions.

[0006] To achieve the above object, the technical solution of the embodiments of the present application is realized as follows:

[0007] The embodiment of the present utility model provides a boom pin system for a telescopic boom, and the boom pin system includes:

[0008] A boom pin driving oil cylinder having a first working port, and the boom pin driving oil cylinder is used to drive the boom pin to insert and extract the pin;

[0009] A cylinder pin driving oil cylinder having a second working port, and the cylinder pin driving oil cylinder is used to drive the cylinder pin to insert and extract the pin;

[0010] A two-way pump provided with a first oil port and a second oil port,

[0011] A boom pin working oil path and a cylinder pin working oil path, the boom pin working oil path communicates the first oil port and the first working port, and the cylinder pin working oil path communicates the second oil port and the second working port.

[0012] In some embodiments, the arm pin driving oil cylinder is a single-acting reset oil cylinder. The first working port is communicated with the rod chamber of the arm pin driving oil cylinder. When the two-way pump is in the reverse state, the piston rod of the arm pin driving oil cylinder extends.

[0013] And / or, the cylinder pin driving oil cylinder is a single-acting reset oil cylinder. The second working port is communicated with the rod chamber of the cylinder pin driving oil cylinder. When the two-way pump is in the forward state, the piston rod of the cylinder pin driving oil cylinder extends.

[0014] In some embodiments, both the arm pin driving oil cylinder and the cylinder pin driving oil cylinder are single-acting reset oil cylinders. The first working port is communicated with the rod chamber of the arm pin driving oil cylinder, and the second working port is communicated with the rod chamber of the cylinder pin driving oil cylinder. When the two-way pump is in the forward state, the piston rod of the arm pin driving oil cylinder retracts and the piston rod of the cylinder pin driving oil cylinder extends. When the two-way pump is in the reverse state, the piston rod of the arm pin driving oil cylinder extends and the piston rod of the cylinder pin driving oil cylinder retracts.

[0015] In some embodiments, the boom pin system further includes a pressure-boosting oil storage device, a first branch, and a first valve device. The pressure-boosting oil storage device has a third working port. The first branch communicates the arm pin working oil circuit with the third working port. The first valve device is disposed on the first branch and is used to open and close the first branch.

[0016] And / or, the boom pin system further includes a pressure-boosting oil storage device, a second branch, and a second valve device. The pressure-boosting oil storage device is provided with a third working port. The second branch communicates the cylinder pin working oil circuit with the third working port. The second valve device is disposed on the second branch and is used to open and close the second branch.

[0017] In some embodiments, the boom pin system further includes a pressure-boosting oil storage device, a first oil circuit, and a first one-way valve. The pressure-boosting oil storage device is provided with a third working port. The first oil circuit communicates the arm pin working oil circuit with the third working port. The first one-way valve is disposed on the first oil circuit and its inlet is communicated with the third working port.

[0018] And / or, the boom pin system further includes a pressure-boosting oil storage device, a second oil circuit, and a second one-way valve. The pressure-boosting oil storage device is provided with a third working port. The second oil circuit communicates the cylinder pin working oil circuit with the third working port. The second one-way valve is disposed on the second oil circuit and its inlet is communicated with the third working port.

[0019] In some embodiments, the boom pin system further includes a pressurized oil storage device, a first overflow oil circuit, and a first overflow valve. The pressurized oil storage device is provided with a third working port. The first overflow oil circuit connects the boom pin working oil circuit and the third working port. The first overflow valve is disposed in the first overflow oil circuit and its outlet connects to the third working port.

[0020] And / or, the boom pin system further includes a pressurized oil storage device, a second overflow oil circuit, and a second overflow valve. The second overflow oil circuit connects the cylinder pin working oil circuit and the third working port. The second overflow valve is disposed in the second overflow oil circuit and its outlet connects to the third working port.

[0021] In some embodiments, the pressurized oil storage device includes one of a pressurized oil tank, an accumulator, a bladder pressurizing device, and a spring pressurizing device.

[0022] In some embodiments, the boom pin system further includes a first pressure sensor for detecting the hydraulic oil pressure value of the oil circuit on the side where the first oil port of the bidirectional pump is located.

[0023] And / or, the boom pin system further includes a second pressure sensor for detecting the hydraulic oil pressure value of the oil circuit on the side where the second oil port of the bidirectional pump is located.

[0024] In some embodiments, the boom pin system further includes a telescopic cylinder for driving the telescopic boom to extend and retract. A through core tube is provided in the piston rod of the telescopic cylinder, and the core tube forms at least part of at least one of the boom pin working oil circuit and the cylinder pin working oil circuit.

[0025] Alternatively, both the boom pin working oil circuit and the cylinder pin working oil circuit are provided in the cylinder barrel of the telescopic cylinder.

[0026] An embodiment of the present invention further provides a telescopic boom, which includes a telescopic cylinder, a plurality of boom sections, boom pins, cylinder pins, and the boom pin system according to any one of the foregoing embodiments. The boom pin system is disposed on the telescopic cylinder. The boom section is provided with boom pin holes and cylinder pin holes. The boom pin system is used to control the insertion and extraction of the boom pins and the cylinder pins. The cylinder pin can be inserted into the cylinder pin hole to lock the telescopic cylinder and the boom section, and the boom pin can be inserted into the boom pin hole to lock the boom section.

[0027] An embodiment of the present invention further provides a working machine, which includes the telescopic boom according to the foregoing embodiment.

[0028] In the boom pin system according to the embodiment of the present utility model, the change in the rotation direction of the bidirectional pump itself is directly utilized to achieve the change in the flow direction of the hydraulic oil, thereby canceling the reversing valve in the prior art, avoiding the problem of jamming during the reversing process of the reversing valve, and avoiding the problem that the spool is difficult to move due to the adhesion of the hydraulic oil under low-temperature and cold working conditions. The reversing delay is reduced, the structure of the boom pin system is simplified, which is beneficial to improving the reversing efficiency and control accuracy, expanding the application range of the boom pin system, and enhancing the reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 FIG. 6 is a schematic diagram of the bidirectional pump in the forward rotation state in the first embodiment of the present utility model, where the solid arrow represents the flow direction of the hydraulic oil;

[0030] Figure 2 FIG. 10 is a schematic diagram of the bidirectional pump in the reverse rotation state in the first embodiment of the present utility model, where the solid arrow represents the flow direction of the hydraulic oil;

[0031] Figure 3 FIG. 14 is a schematic diagram of the bidirectional pump in the stopped state in the first embodiment of the present utility model, where the solid arrow represents the flow direction of the hydraulic oil.

[0032] Figure 4 FIG. 18 is a schematic diagram of the bidirectional pump in the forward rotation state in the second embodiment of the present utility model;

[0033] Figure 5 FIG. 22 is a schematic diagram of the bidirectional pump in the reverse rotation state in the second embodiment of the present utility model.

[0034] DESCRIPTION OF THE REFERENCE NUMERALS

[0035] 10, boom pin driving oil cylinder; 10a, first working port; 11, first pressure sensor; 20, cylinder pin driving oil cylinder; 20a, second working port; 21, second pressure sensor; 30, bidirectional pump; 30a, first oil port; 30b, second oil port; 40, motor; 50, boom pin working oil circuit; 51, cylinder pin working oil circuit; 60, booster oil storage device; 60a, third working port; 70, first branch; 71, first valve device; 72, second branch; 73, second valve device; 80, first oil circuit; 81, first one-way valve; 82, second oil circuit; 83, second one-way valve; 90, first overflow oil circuit; 91, first overflow valve; 92, second overflow oil circuit; 93, second overflow valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] 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 implementation manners 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.

[0037] An embodiment of the present utility model provides a boom pin system, refer to Figures 1 to 3 , which is used for a telescopic boom.

[0038] An embodiment of the present utility model provides a telescopic boom, which includes a telescopic oil cylinder, arm pins, cylinder pins, a plurality of boom sections, and the boom pin system according to any embodiment of the present utility model.

[0039] The boom section is provided with arm pin holes and cylinder pin holes. The boom pin system is used to control the insertion and extraction of arm pins and cylinder pins and drive the telescopic movement between boom sections through the telescopic oil cylinder. The cylinder pin can be inserted into the cylinder pin hole to lock the telescopic oil cylinder and the boom section, and the arm pin can be inserted into the arm pin hole to lock the boom section. Locking of the boom section means that the positions between at least two boom sections are locked.

[0040] Specifically, the arm pins are arranged on the boom section, and the cylinder pins are arranged on the cylinder barrel of the telescopic oil cylinder.

[0041] In this way, it is possible to directly switch between the forward rotation state and the reverse rotation state through the two-way pump 30, realizing the cooperation between the cylinder pin and the cylinder pin hole, and between the arm pin and the arm pin hole, which is beneficial to improving the response speed of the relative telescoping between multiple boom sections and reducing the number of components in the telescopic boom.

[0042] The boom pin system includes an arm pin driving oil cylinder 10, a cylinder pin driving oil cylinder 20, a two-way pump 30, an arm pin working oil circuit 50, and a cylinder pin working oil circuit 51.

[0043] The arm pin driving oil cylinder 10 has a first working port 10a, and the arm pin driving oil cylinder 10 is used to drive the insertion and extraction of the arm pin. Specifically, when the piston rod of the arm pin driving oil cylinder 10 extends, it drives the arm pin to extend and insert into the arm pin hole, realizing the insertion of the arm pin; when the piston rod of the arm pin driving oil cylinder 10 retracts, it drives the arm pin to withdraw from the arm pin hole, realizing the extraction of the arm pin.

[0044] The cylinder pin driving oil cylinder 20 has a second working port 20a, and the cylinder pin driving oil cylinder 20 is used to drive the insertion and extraction of the cylinder pin. Specifically, when the piston rod of the cylinder pin driving oil cylinder 20 extends, it drives the cylinder pin to extend and insert into the cylinder pin hole, realizing the insertion of the cylinder pin; when the piston rod of the cylinder pin driving oil cylinder 20 retracts, it drives the cylinder pin to withdraw from the cylinder pin hole, realizing the extraction of the cylinder pin.

[0045] The two-way pump 30 is provided with a first oil port 30a and a second oil port 30b.

[0046] The arm pin working oil circuit 50 communicates the first oil port 30a and the first working port 10a, and the cylinder pin working oil circuit 51 communicates the second oil port 30b and the second working port 20a.

[0047] The two-way pump 30 includes a forward rotation state and a reverse rotation state. In the forward rotation state, the two-way pump 30 withdraws hydraulic oil from the cylinder pin working oil circuit 51 and delivers hydraulic oil to the arm pin working oil circuit 50; in the reverse rotation state, the two-way pump 30 withdraws hydraulic oil from the arm pin working oil circuit 50 and delivers hydraulic oil to the cylinder pin working oil circuit 51.

[0048] Among them, the first working port 10a is used to allow the hydraulic oil in the arm pin working oil circuit 50 to enter the arm pin driving cylinder 10, or allow the hydraulic oil in the arm pin driving cylinder 10 to enter the arm pin working oil circuit 50 through the first working port 10a.

[0049] The second working port 20a is used to allow the hydraulic oil in the cylinder pin working oil circuit 51 to enter the cylinder pin driving cylinder 20, or allow the hydraulic oil in the cylinder pin driving cylinder 20 to enter the cylinder pin working oil circuit 51 through the second working port 20a.

[0050] The two-way pump 30 refers to a pump that can rotate forward or backward to selectively supply oil to two different oil circuits. It can be understood that by switching the rotation direction, the functions of the first oil port 30a and the second oil port 30b are switched between oil supply and oil return. Specifically, when the first oil port 30a is the oil supply port of the two-way pump 30, the second oil port 30b is the oil return port of the two-way pump 30. After switching the rotation direction of the two-way pump 30, the first oil port 30a becomes the oil return port of the two-way pump 30, and the second oil port 30b is the oil supply port of the two-way pump 30.

[0051] It should be noted that the forward rotation state and the reverse rotation state of the two-way pump 30 are to distinguish the opposite rotation directions in the two states, rather than specifying a specific rotation direction.

[0052] When the two-way pump 30 is in the forward rotation state, the two-way pump 30 delivers the hydraulic oil in the cylinder pin working oil circuit 51 to the arm pin working oil circuit 50, so that the arm pin driving cylinder 10 performs corresponding actions under the pressure of the hydraulic oil, and then drives the arm pin to perform pin insertion and extraction actions; at the same time, since the hydraulic oil in the cylinder pin working oil circuit 51 decreases and the pressure drops, when there is hydraulic oil in the cylinder pin driving cylinder 20, the hydraulic oil in the cylinder pin driving cylinder 20 can be withdrawn into the cylinder pin working oil circuit 51, also enabling the cylinder pin driving cylinder 20 to perform corresponding actions, and then driving the cylinder pin to perform pin insertion and extraction actions.

[0053] When the two-way pump 30 is in the reverse state, the two-way pump 30 transports the hydraulic oil in the arm pin working oil circuit 50 to the cylinder pin working oil circuit 51, so that the cylinder pin driving oil cylinder 20 performs corresponding actions under the pressure of the hydraulic oil, and then drives the cylinder pin to realize the pin insertion and extraction actions; at the same time, since the hydraulic oil in the arm pin working oil circuit 50 decreases and the pressure drops, when there is hydraulic oil in the arm pin driving oil cylinder 10, the hydraulic oil in the arm pin driving oil cylinder 10 can be drawn out into the arm pin working oil circuit 50, also causing the arm pin driving oil cylinder 10 to perform corresponding actions, and then driving the arm pin to realize the pin insertion and extraction actions.

[0054] In the boom pin insertion system of the embodiment of the present utility model, the change in the rotation direction of the two-way pump 30 itself is directly utilized to change the flow direction of the hydraulic oil, so that the directional control valve in the prior art can be cancelled, thereby avoiding the problem of jamming during the commutation of the directional control valve, and avoiding the problem that the spool is difficult to move due to the viscosity of the hydraulic oil under low-temperature and cold working conditions of the directional control valve, reducing the commutation delay, simplifying the structure of the boom pin insertion system, being beneficial to improving the commutation efficiency and control accuracy, being beneficial to expanding the application range of the boom pin insertion system, and enhancing the reliability.

[0055] In addition, the boom pin insertion system of the embodiment of the present application forms a closed hydraulic system, and a sealed oil circuit is formed among the two-way pump 30, the arm pin working oil circuit 50, the cylinder pin working oil circuit 51, the arm pin driving oil cylinder 10 and the cylinder pin driving oil cylinder 20. In this way, the probability of air entering the oil circuit and forming air bubbles is reduced, which is beneficial to reducing the risk of abnormal vibration and other hazards caused by the two-way pump 30 sucking air when the telescopic boom is at different pitching angles, and improving the use safety and use stability of the boom pin insertion system. In some embodiments, the arm pin driving oil cylinder 10, the cylinder pin driving oil cylinder 20 and the two-way pump 30 are all arranged on the cylinder barrel of the telescopic oil cylinder.

[0056] Exemplarily, refer to Figures 1 to 3 , the two-way pump 30 is configured with a motor 40, and the rotation direction of the two-way pump 30 is controlled by the motor 40, which is beneficial to realizing rapid and precise adjustment of the rotation speed of the two-way pump 30, and is also beneficial to making the boom pin insertion system adapt to new energy forms of working machinery such as pure electric and plug-in hybrid.

[0057] Of course, the working machinery can also be fuel-powered or hybrid-powered, and a generator is connected to the engine to supply power to the motor 40.

[0058] In some embodiments, the arm pin driving oil cylinder 10 is a double-acting oil cylinder, and by switching the oil circuit, the oil inlet and oil return of the rod chamber and the rodless chamber are alternated, so that the piston rod drives the arm pin to complete the pin insertion and extraction actions. For example, when the first working port 10a is communicated with the rod chamber of the arm pin driving oil cylinder 10, and the rodless chamber of the arm pin driving oil cylinder 10 is connected to other oil circuits, when the two-way pump 30 rotates forward, when the first working port 10a intakes oil, the rodless chamber returns oil, and the piston rod of the arm pin driving oil cylinder 10 retracts, realizing the pin extraction of the arm pin. When the two-way pump 30 rotates in reverse, the first working port 10a returns oil, the rodless chamber intakes oil, and the piston rod of the arm pin driving oil cylinder 10 extends, realizing the pin insertion of the arm pin. When the first working port 10a is communicated with the rodless chamber of the arm pin driving oil cylinder 10, and the rod chamber of the arm pin driving oil cylinder 10 is connected to other oil circuits, when the two-way pump 30 rotates forward, when the first working port 10a intakes oil, the rod chamber returns oil, and the piston rod of the arm pin driving oil cylinder 10 extends, realizing the pin insertion of the arm pin. When the two-way pump 30 rotates in reverse, the first working port 10a returns oil, the rod chamber intakes oil, and the piston rod of the arm pin driving oil cylinder 10 retracts, realizing the pin extraction of the arm pin.

[0059] In some embodiments, referring to Figures 1 to 3 , the arm pin driving oil cylinder 10 is a single-acting reset oil cylinder, the first working port 10a is communicated with the rod chamber of the arm pin driving oil cylinder 10, and when the two-way pump 30 is in the reverse state, the piston rod of the arm pin driving oil cylinder 10 extends.

[0060] For example, a first elastic reset member is provided in the arm pin driving oil cylinder 10. In the initial state, the first elastic reset member pushes the piston rod to extend, so that the volume of the rod chamber is in the minimum volume state. The force exerted by the first elastic reset member on the piston rod can be used to drive the arm pin to switch from the pin extraction state to the pin insertion state.

[0061] When the two-way pump 30 is in the reverse state, due to the negative pressure effect of the arm pin working oil circuit 50, the hydraulic oil is drawn out of the rod chamber, so that the pressure in the rod chamber decreases. The first elastic reset member pushes the piston rod to extend, thereby driving the arm pin to extend and driving the arm pin to switch from the pin extraction state to the pin insertion state.

[0062] In this way, the power for controlling the pin insertion and extraction of the arm pin only comes from the arm pin driving oil cylinder 10 and the two-way pump 30, and there is no need for an additional valve device to realize the commutation adjustment of the hydraulic oil, which is beneficial to simplifying the structure of the boom pin system and improving the response speed of the arm pin insertion and extraction actions.

[0063] The specific type of the first elastic reset member is not limited, such as a helical spring.

[0064] In some embodiments, the cylinder pin driving oil cylinder 20 is a double-acting oil cylinder, which realizes the alternating oil inlet and oil return of the rod chamber and the non-rod chamber by switching the oil circuit, and further realizes the piston rod driving the cylinder pin to complete the pin insertion and extraction actions. For example, when the second working port 20a is communicated with the rod chamber of the cylinder pin driving oil cylinder 20, and the non-rod chamber of the cylinder pin driving oil cylinder 20 is connected to other oil circuits, when the two-way pump 30 rotates forward, when the second working port 20a intakes oil, the non-rod chamber returns oil, and the piston rod of the cylinder pin driving oil cylinder 20 retracts, realizing the pin extraction of the cylinder pin. When the two-way pump 30 rotates reversely, the second working port 20a returns oil, the non-rod chamber intakes oil, and the piston rod of the cylinder pin driving oil cylinder 20 extends, realizing the pin insertion of the cylinder pin. When the second working port 20a is communicated with the non-rod chamber of the cylinder pin driving oil cylinder 20, and the rod chamber of the cylinder pin driving oil cylinder 20 is connected to other oil circuits, when the two-way pump 30 rotates forward, when the second working port 20a intakes oil, the rod chamber returns oil, and the piston rod of the cylinder pin driving oil cylinder 20 extends, realizing the pin insertion of the cylinder pin. When the two-way pump 30 rotates reversely, the second working port 20a returns oil, the rod chamber intakes oil, and the piston rod of the cylinder pin driving oil cylinder 20 retracts, realizing the pin extraction of the cylinder pin.

[0065] In some embodiments, referring to Figures 1 to 3 , the cylinder pin driving oil cylinder 20 is a single-acting reset oil cylinder, the second working port 20a is communicated with the rod chamber of the cylinder pin driving oil cylinder 20, and when the two-way pump 30 is in the forward rotation state, the piston rod of the cylinder pin driving oil cylinder 20 extends.

[0066] For example, a second elastic reset member is provided in the cylinder pin driving oil cylinder 20. In the initial state, the second elastic reset member pushes the piston rod to extend, so that the volume of the rod chamber is in the minimum volume state. The force exerted by the second elastic reset member on the piston rod can be used to drive the cylinder pin to switch from the pin extraction state to the pin insertion state.

[0067] When the two-way pump 30 is in the reverse rotation state, due to the negative pressure effect of the cylinder pin working oil circuit 51, the hydraulic oil is drawn out from the rod chamber, so that the pressure in the rod chamber is reduced. The second elastic reset member pushes the piston rod to extend, thereby driving the cylinder pin to extend and driving the cylinder pin to switch from the pin extraction state to the pin insertion state.

[0068] In this way, the power for controlling the pin insertion and extraction of the cylinder pin only comes from the cylinder pin driving oil cylinder 20 and the two-way pump 30, and there is no need for an additional valve device to realize the commutation adjustment of the hydraulic oil, which is beneficial to simplifying the structure of the boom pin system and improving the response speed of the pin insertion and extraction actions of the cylinder pin.

[0069] It can be understood that no matter whether the two-way pump 30 is in the forward rotation state or the reverse rotation state, at least one of the arm pins and the cylinder pins is in the pin insertion state to reduce the operation risk caused by the loss of restraint of the boom section.

[0070] The specific type of the second elastic reset member is not limited, such as a spiral spring.

[0071] In some embodiments, referring to Figure 1 and Figure 2 , both the arm pin driving oil cylinder 10 and the cylinder pin driving oil cylinder 20 are single-acting reset oil cylinders. The first working port 10a communicates with the rod chamber of the arm pin driving oil cylinder 10, and the second working port 20a communicates with the rod chamber of the cylinder pin driving oil cylinder 20. When the two-way pump 30 is in the forward rotation state, the piston rod of the arm pin driving oil cylinder 10 retracts and the piston rod of the cylinder pin driving oil cylinder 20 extends. When the two-way pump 30 is in the reverse rotation state, the piston rod of the arm pin driving oil cylinder 10 extends and the piston rod of the cylinder pin driving oil cylinder 20 retracts.

[0072] Regardless of whether the two-way pump 30 is in the forward rotation state or the reverse rotation state, it can always ensure that the piston rod of one of the arm pin driving oil cylinder 10 and the cylinder pin driving oil cylinder 20 extends, while the piston rod of the other retracts, so that one of the arm pin and the cylinder pin is in the pin-pulling state and the other is in the pin-inserting state.

[0073] In this way, by adjusting the rotation direction of the two-way pump 30, the two-way pump 30 pumps out the hydraulic oil in the rod chamber of one of the arm pin driving oil cylinder 10 and the cylinder pin driving oil cylinder 20 and transports it to the rod chamber of the other, realizing the linkage of the arm pin driving oil cylinder 10 and the cylinder pin driving oil cylinder 20, and improving the operation safety of the telescopic arm during the telescoping process.

[0074] It can be understood that after the boom pin system is used for a period of time, there may be a certain amount of leakage of the hydraulic oil, which affects the normal operation of the boom pin system.

[0075] In some embodiments, referring to Figures 1 to 3 , the boom pin system further includes a pressurized oil storage device 60. The pressurized oil storage device 60 has a third working port 60a, and the third working port 60a is connected to at least one of the arm pin working oil circuit 50 and the cylinder pin working oil circuit 51.

[0076] The third working port 60a is used to allow the hydraulic oil to enter or discharge from the pressurized oil storage device 60.

[0077] The pressurized oil storage device 60 stores hydraulic oil and makes the hydraulic oil have a certain pressure through a pressurization method. The hydraulic oil in the pressurized oil storage device 60 can be supplemented into the arm pin working oil circuit 50 and the cylinder pin working oil circuit 51 to supplement the hydraulic oil flow required for the normal operation of the boom pin system; at the same time, since the boom pin system can rotate and pitch along with the telescopic arm, the liquid level of the hydraulic oil in the boom pin system fluctuates, which easily causes a risk of cavitation in the two-way pump 30. And because the pressurized oil storage device 60 can supplement the hydraulic oil into the oil circuit of the boom pin system, it is beneficial to reduce the air bubbles in the hydraulic oil, reduce the risk of cavitation, and is also beneficial to optimizing the oil suction environment of the two-way pump 30 and improving its operating speed.

[0078] In some embodiments provided with a pressure-boosting oil storage device 60, refer to Figures 1 to 3 , the boom pin system further includes a first branch 70 and a first valve device 71. The first branch 70 communicates the arm pin working oil circuit 50 with the third working port 60a. The first valve device 71 is disposed on the first branch 70 and is used to open and close the first branch 70.

[0079] For example, refer to Figure 5 , when the volume of the arm pin driving cylinder 10 is greater than the volume of the cylinder pin driving cylinder 20, the bidirectional pump 30 is controlled to be in the reverse state and the first valve device 71 conducts the first branch 70. Part of the hydraulic oil drawn from the arm pin driving cylinder 10 enters the cylinder pin working oil circuit 51, and the other part enters the pressure-boosting oil storage device 60 through the first branch 70 via the third working port 60a. In this way, it is beneficial to completely draw out the hydraulic oil in the arm pin driving cylinder 10, and it is beneficial for the arm pin driving cylinder 10 to make full use of the stroke of its piston rod. At the same time, it reduces the risk of leakage and damage to the cylinder pin working oil circuit 51 and the cylinder pin driving cylinder 20 caused by excessive hydraulic oil entering them.

[0080] For example, in some embodiments where the arm pin driving cylinder 10 is a single-acting reset cylinder, refer to Figure 3 , after the bidirectional pump 30 is switched from the forward rotation state to the stop state, the first valve device 71 is controlled to conduct the first branch 70. Under the driving force of the first elastic reset member, the hydraulic oil in the arm pin driving cylinder 10 enters the pressure-boosting oil storage device 60 through the arm pin working oil circuit 50 and the first branch 70, so that the arm pin driving cylinder 10 can drive the arm pin to insert the pin. In this way, it is beneficial to lock the boom section by driving the arm pin when the bidirectional pump 30 stops rotating due to manual active control, accidental conditions, etc.

[0081] The specific type of the first valve device 71 is not limited. Exemplarily, refer to Figures 1 to 3 , the first valve device 71 is a two-position two-way valve. The first valve device 71 includes a first valve working port and a second valve working port. The first valve working port is communicated with the arm pin working oil circuit 50 through a part of the first branch 70, and the second valve working port is communicated with the third working port 60a through another part of the first branch 70. In the first working position state, the first valve working port and the second valve working port are cut off. In the second working position state, the first valve working port and the second valve working port are conducted.

[0082] In some embodiments provided with a pressure-boosting oil storage device 60, refer to Figures 1 to 3 , the boom pin system further includes a second branch 72 and a second valve device 73. The second branch 72 communicates the cylinder pin working oil circuit 51 with the third working port 60a. The second valve device 73 is disposed on the second branch 72 and is used to open and close the second branch 72.

[0083] For example, refer toFigure 4 When the volume of the cylinder pin driving oil cylinder 20 is greater than that of the boom pin driving oil cylinder 10, the two-way pump 30 is controlled to be in the forward rotation state and the second valve device 73 conducts the second branch 72. Part of the hydraulic oil withdrawn from the cylinder pin driving oil cylinder 20 enters the cylinder pin working oil circuit 51, and the other part enters the pressurizing oil storage device 60 through the second branch 72 via the third working port 60a. In this way, it is beneficial to completely withdraw the hydraulic oil in the cylinder pin driving oil cylinder 20, which is conducive to the cylinder pin driving oil cylinder 20 being able to make full use of the stroke of its piston rod; at the same time, it reduces the risk of excessive hydraulic oil entering the boom pin working oil circuit 50 and the boom pin driving oil cylinder 10, resulting in leakage and damage of both.

[0084] For example, in some embodiments where the cylinder pin driving oil cylinder 20 is a single-acting reset oil cylinder, refer to Figure 3 After the two-way pump 30 is switched from the reverse rotation state to the stop state, the second valve device 73 is controlled to conduct the second branch 72. Under the driving force of the second elastic reset member, the hydraulic oil in the cylinder pin driving oil cylinder 20 enters the pressurizing oil storage device 60 through the cylinder pin working oil circuit 51 and the second branch 72, so that the cylinder pin driving oil cylinder 20 can drive the boom pin to be in the pin-inserting state.

[0085] In this way, it is beneficial to drive the cylinder pin locking boom section and the telescopic oil cylinder in the state where the two-way pump 30 stops rotating due to manual active control, accidental conditions, etc.

[0086] The specific type of the second valve device 73 is not limited. Exemplarily, refer to Figures 1 to 3 The first valve device 71 is a two-position two-way valve. The second valve device 73 includes a third valve working port and a fourth valve working port. The second valve working port is connected to the cylinder pin working oil circuit 51 through a part of the second branch 72, and the second valve working port is connected to the third working port 60a through another part of the second branch 72. In the third working position state, the third valve working port and the fourth valve working port are cut off, and in the fourth working position state, the third valve working port and the fourth valve working port are conducted.

[0087] In some embodiments, refer to Figures 1 to 3 The boom pin system further includes a first oil circuit 80 and a first one-way valve 81. The first oil circuit 80 connects the boom pin working oil circuit 50 and the third working port 60a. The first one-way valve 81 is arranged in the first oil circuit 80 and its inlet is connected to the third working port 60a.

[0088] That is to say, the hydraulic oil in the first oil circuit 80 can only flow unidirectionally from the third working port 60a to the boom pin working oil circuit 50. In a state where the hydraulic oil pressure of the pressure boosting oil storage device 60 is greater than the hydraulic oil pressure of the boom pin working oil circuit 50, the pressure boosting oil storage device 60 can output hydraulic oil to the boom pin working oil circuit 50; while in a state where the hydraulic oil pressure of the pressure boosting oil storage device 60 is less than the hydraulic oil pressure of the boom pin working oil circuit 50, the first one-way valve 81 cuts off the first oil circuit 80, so that the hydraulic oil in the boom pin working oil circuit 50 cannot enter the pressure boosting oil storage device 60.

[0089] In this way, on the one hand, it is beneficial to reduce the adverse effects on the timely response of the boom pin driving cylinder 10 caused by the direct entry of hydraulic oil into the pressure boosting oil storage device 60 when the two-way pump 30 is in the forward rotation state, and also reduces the probability of damage to the pressure boosting oil storage device 60 due to the pressure of the entering hydraulic oil; on the other hand, it is beneficial to supplement the hydraulic oil in the pressure boosting oil storage device 60 into the boom pin working oil circuit 50 when the two-way pump 30 is in the reverse rotation state to meet the different hydraulic oil requirements of the boom pin driving cylinder 10 and the cylinder pin driving cylinder 20.

[0090] In some embodiments, referring to Figures 1 to 3 , the boom pin system further includes a second oil circuit 82 and a second one-way valve 83. The second oil circuit 82 connects the cylinder pin working oil circuit 51 and the third working port 60a. The second one-way valve 83 is arranged in the second oil circuit 82 and its inlet is connected to the third working port 60a.

[0091] That is to say, the hydraulic oil in the second oil circuit 82 can only flow unidirectionally from the third working port 60a to the cylinder pin working oil circuit 51. In a state where the hydraulic oil pressure of the pressure boosting oil storage device 60 is greater than the hydraulic oil pressure of the cylinder pin working oil circuit 51, the pressure boosting oil storage device 60 can output hydraulic oil to the cylinder pin working oil circuit 51; while in a state where the hydraulic oil pressure of the pressure boosting oil storage device 60 is less than the hydraulic oil pressure of the cylinder pin working oil circuit 51, the second one-way valve 83 cuts off the second oil circuit 82, so that the hydraulic oil in the cylinder pin working oil circuit 51 cannot enter the pressure boosting oil storage device 60.

[0092] In this way, on the one hand, it is beneficial to reduce the adverse effects on the timely response of the cylinder pin driving cylinder 20 caused by the entry of hydraulic oil into the pressure boosting oil storage device 60 when the two-way pump 30 is in the reverse rotation state, and also reduces the probability of damage to the pressure boosting oil storage device 60 due to the pressure of the entering hydraulic oil; on the other hand, it is beneficial to supplement the hydraulic oil in the pressure boosting oil storage device 60 into the cylinder pin working oil circuit 51 when the two-way pump 30 is in the forward rotation state to meet the different hydraulic oil requirements of the boom pin driving cylinder 10 and the cylinder pin driving cylinder 20.

[0093] In some embodiments where both the arm pin drive cylinder 10 and the cylinder pin drive cylinder 20 are single-acting reset cylinders, refer to Figures 1 to 3 , the boom pin system includes a first oil passage 80, a first check valve 81, a second oil passage 82, and a second check valve 83. When the two-way pump 30 is in a stopped state, the piston rods of both the arm pin drive cylinder 10 and the cylinder pin drive cylinder 20 are in an extended state, and there is no or only a small amount of hydraulic oil in their rod chambers. It is impossible to directly draw the hydraulic oil from the rod chamber of one of them by the forward or reverse rotation of the two-way pump 30. Therefore, by opening one of the first check valve 81 and the second check valve 83, regardless of whether the two-way pump 30 is switched to the forward rotation state or the reverse rotation state, the hydraulic oil is drawn from the pressurized oil storage device 60 and supplied to one of the arm pin drive cylinder 10 and the cylinder pin drive cylinder 20.

[0094] In some embodiments provided with a pressurized oil storage device 60, refer to Figures 1 to 3 , the boom pin system further includes a first overflow oil passage 90 and a first overflow valve 91. The first overflow oil passage 90 communicates the arm pin working oil passage 50 with the third working port 60a, and the first overflow valve 91 is provided in the first overflow oil passage 90 and its outlet communicates with the third working port 60a.

[0095] That is to say, when the pressure of the hydraulic oil in the arm pin working oil passage 50 reaches the opening pressure of the first overflow valve 91, the first overflow valve 91 opens to make the first overflow oil passage 90 conduct, and the hydraulic oil enters the pressurized oil storage device 60 from the arm pin working oil passage 50 through the first overflow oil passage 90.

[0096] In this way, the probability of damage to the arm pin drive cylinder 10 caused by excessive pressure of the hydraulic oil in the arm pin working oil passage 50 is reduced, which is beneficial to improving the use safety of the boom pin system.

[0097] It can be understood that the opening pressure of the first overflow valve 91 is not greater than the maximum allowable working pressure of the arm pin drive cylinder 10.

[0098] In some embodiments provided with a pressurized oil storage device 60, refer to Figures 1 to 3 , the boom pin system further includes a second overflow oil passage 92 and a second overflow valve 93. The second overflow oil passage 92 communicates the cylinder pin working oil passage 51 with the third working port 60a, and the second overflow valve 93 is provided in the second overflow oil passage 92 and its outlet communicates with the third working port 60a.

[0099] That is to say, when the pressure of the hydraulic oil in the cylinder pin working oil passage 51 reaches the opening pressure of the second overflow valve 93, the second overflow valve 93 opens to make the second overflow oil passage 92 conduct, and the hydraulic oil enters the pressurized oil storage device 60 from the cylinder pin working oil passage 51 through the second overflow oil passage 92.

[0100] In this way, the probability of damage to the cylinder pin drive cylinder 20 caused by excessive pressure of the hydraulic oil in the working oil circuit 51 of the cylinder pin is reduced, which is beneficial to improving the use safety of the boom pin system.

[0101] It can be understood that the opening pressure of the second overflow valve 93 is not greater than the maximum allowable working pressure of the cylinder pin drive cylinder 20.

[0102] It can be understood that in the embodiment provided with the first oil circuit 80, the first branch circuit 70 and the first overflow oil circuit 90, the first oil circuit 80, the first branch circuit 70 and the first overflow oil circuit 90 are connected in parallel with each other.

[0103] It can be understood that in the embodiment provided with the second oil circuit 82, the second branch circuit 72 and the second overflow oil circuit 92, the second oil circuit 82, the second branch circuit 72 and the second overflow oil circuit 92 are connected in parallel with each other.

[0104] In some embodiments where both the arm pin drive cylinder 10 and the cylinder pin drive cylinder 20 are single-acting reset cylinders, the reset pressures of both are greater than the boosting pressure of the boosting oil storage device 60.

[0105] In this way, on the one hand, in the state where the two-way pump 30 stops working and rotates, it is avoided that the arm pin drive cylinder 10 and the cylinder pin drive cylinder 20 cannot be reset due to the pressure of the boosting oil storage device 60; on the other hand, the hydraulic oil in the arm pin drive cylinder 10 and the cylinder pin drive cylinder 20 can enter the boosting oil storage device 60 after being discharged.

[0106] In some embodiments, the boosting oil storage device 60 includes one of a boosting oil tank, an accumulator, a bladder boosting device, and a spring boosting device to store a certain amount of hydraulic oil and be able to output the hydraulic oil.

[0107] In some embodiments, refer to Figures 1 to 3 , the boom pin system further includes a first pressure sensor 11, and the first pressure sensor 11 is used to detect the hydraulic oil pressure value of the oil circuit on the side where the first oil port 30a of the two-way pump 30 is located.

[0108] In some embodiments, refer to Figures 1 to 3 , the boom pin system further includes a second pressure sensor 21, and the second pressure sensor 21 is used to detect the hydraulic oil pressure value of the oil circuit on the side where the second oil port 30b of the two-way pump 30 is located.

[0109] In some embodiments, refer to Figures 1 to 3, there are no hydraulic components on the working oil circuit 50 of the arm pin. That is to say, there are no hydraulic components on the working oil circuit 50 of the arm pin that can adjust the flow direction of the hydraulic oil. The hydraulic oil output by the two-way pump 30 can directly enter the arm pin driving oil cylinder 10 without any flow direction adjustment, which is beneficial to simplifying the structure of the boom pin system and reducing the pressure loss of the hydraulic oil in the working oil circuit 50 of the arm pin.

[0110] In some embodiments, refer to Figures 1 to 3 , there are no hydraulic components on the working oil circuit 51 of the cylinder pin. That is to say, there are no hydraulic components on the working oil circuit 51 of the cylinder pin that can adjust the flow direction of the hydraulic oil. The hydraulic oil output by the two-way pump 30 can directly enter the cylinder pin driving oil cylinder 20 without any flow direction adjustment, which is beneficial to simplifying the structure of the boom pin system and reducing the pressure loss of the hydraulic oil in the working oil circuit 51 of the cylinder pin.

[0111] In some embodiments, the boom pin system further includes a telescopic oil cylinder for driving the telescopic boom to extend and retract. After the cylinder barrel of the telescopic oil cylinder is fixed to an arm section through a cylinder pin, the telescopic oil cylinder extends to push the arm section to move, thereby realizing the extension and retraction of the telescopic boom.

[0112] In some embodiments, a through core tube is provided in the piston rod of the telescopic oil cylinder, and the core tube forms at least part of at least one of the working oil circuit 50 of the arm pin and the working oil circuit 51 of the cylinder pin.

[0113] In this way, it is beneficial to improve the space utilization rate of the telescopic oil cylinder and make the structure of the boom pin system more compact.

[0114] In some embodiments, both the working oil circuit 50 of the arm pin and the working oil circuit 51 of the cylinder pin are arranged on the cylinder barrel of the telescopic oil cylinder.

[0115] In this way, it is beneficial to simplify the layout of the working oil circuit 50 of the arm pin and the working oil circuit 51 of the cylinder pin, and is beneficial to reducing the production and maintenance costs of the telescopic oil cylinder.

[0116] An embodiment of the present invention also provides a working machine, which includes the telescopic boom in the foregoing embodiment.

[0117] The working machine can be a crane, an aerial work platform, a fire truck, a boom-type working robot, etc.

[0118] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. 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 boom latch system for a telescopic boom, characterized in that: The arm latch system comprises: An arm pin driving cylinder has a first working port, and is used to drive the arm pin to insert or remove the pin; A cylinder pin driving oil cylinder has a second working port, and the cylinder pin driving oil cylinder is used to drive the cylinder pin to insert or remove the pin; A bidirectional pump having a first oil port and a second oil port; An arm pin working oil circuit and a cylinder pin working oil circuit, wherein the arm pin working oil circuit communicates with the first oil port and the first working port, and the cylinder pin working oil circuit communicates with the second oil port and the second working port.

2. The arm latch system according to claim 1, characterized in that: The arm pin driving cylinder is a single-acting reset cylinder, the first working port is connected to the rod chamber of the arm pin driving cylinder, and the piston rod of the arm pin driving cylinder extends when the bidirectional pump is in a reverse state; And / or, the cylinder pin driving cylinder is a single-acting reset cylinder, the second working port is connected to the rod chamber of the cylinder pin driving cylinder, and when the bidirectional pump is in the forward rotation state, the piston rod of the cylinder pin driving cylinder extends out.

3. The arm latch system according to claim 1, characterized in that: The arm pin driving cylinder and the cylinder pin driving cylinder are both single-acting reset cylinders, the first working port is connected to the rod chamber of the arm pin driving cylinder, and the second working port is connected to the rod chamber of the cylinder pin driving cylinder. When the two-way pump is in the forward rotation state, the piston rod of the arm pin driving cylinder retracts and the piston rod of the cylinder pin driving cylinder extends. When the two-way pump is in the reverse state, the piston rod of the arm pin driving cylinder extends and the piston rod of the cylinder pin driving cylinder retracts.

4. The arm latch system according to claim 1, characterized in that: The arm latch system further includes a pressurized oil storage device, a first branch and a first valve device, wherein the pressurized oil storage device has a third working port, the first branch connects the arm pin working oil circuit with the third working port, and the first valve device is disposed in the first branch and is used to open and close the first branch; And / or, the arm latch system also includes a pressurized oil storage device, a second branch and a second valve device, the pressurized oil storage device is provided with a third working port, the second branch connects the cylinder pin working oil circuit with the third working port, and the second valve device is arranged in the second branch and is used to open and close the second branch.

5. The arm latch system according to claim 1, characterized in that: The arm latch system further includes a pressurized oil storage device, a first oil circuit and a first one-way valve, wherein the pressurized oil storage device is provided with a third working port, the first oil circuit is connected with the arm pin working oil circuit and the third working port, and the first one-way valve is provided in the first oil circuit and its inlet is connected with the third working port; And / or, the arm latch system also includes a pressurized oil storage device, a second oil circuit and a second one-way valve, the pressurized oil storage device is provided with a third working port, the second oil circuit connects the cylinder pin working oil circuit with the third working port, and the second one-way valve is arranged in the second oil circuit and its inlet is connected to the third working port.

6. The arm latch system according to claim 1, characterized in that: The arm latch system further includes a pressurized oil storage device, a first overflow oil circuit and a first overflow valve, wherein the pressurized oil storage device is provided with a third working port, the first overflow oil circuit is connected with the arm pin working oil circuit and the third working port, and the first overflow valve is provided in the first overflow oil circuit and its outlet is connected with the third working port; And / or, the arm latch system also includes a pressurized oil storage device, a second overflow oil circuit and a second overflow valve, the second overflow oil circuit connects the cylinder pin working oil circuit with the third working port, and the second overflow valve is arranged in the second overflow oil circuit and its outlet is connected to the third working port.

7. The arm latch system according to any one of claims 4 to 6, characterized in that: The pressurized oil storage device comprises one of a pressurized oil tank, an accumulator, a bladder pressurizing device, and a spring pressurizing device.

8. The arm latch system according to claim 1, characterized in that: The arm latch system further includes a first pressure sensor, which is used to detect the hydraulic oil pressure value of the oil circuit on the side where the first oil port of the bidirectional pump is located; And / or, the arm latch system further includes a second pressure sensor, and the second pressure sensor is used to detect the hydraulic oil pressure value of the oil circuit on the side where the second oil port of the bidirectional pump is located.

9. The arm latch system according to claim 1, characterized in that: The arm latch system further comprises a telescopic oil cylinder, which is used to drive the telescopic arm to extend and retract, and a core tube is provided in the piston rod of the telescopic oil cylinder, and the core tube forms at least a part of at least one of the arm pin working oil circuit and the cylinder pin working oil circuit; Alternatively, the arm pin working oil circuit and the cylinder pin working oil circuit are both arranged in the cylinder barrel of the telescopic cylinder.

10. A telescopic arm, characterized in that: The telescopic arm includes multiple arm sections, arm pins, cylinder pins and the arm frame latch system of any one of claims 1-9, the arm section is provided with an arm pin hole and a cylinder pin hole, the arm frame latch system is used to control the insertion and extraction of the arm pin and the insertion and extraction of the cylinder pin, the cylinder pin can be inserted into the cylinder pin hole to lock the telescopic cylinder with the arm section, and the arm pin can be inserted into the arm pin hole to lock the arm section.

11. A working machine, characterized in that: The working machine includes the telescopic arm of claim 10.

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