Single cylinder latch extension system, control method and crane

Abstract

The present invention provides a single-cylinder latch telescopic system, a control method and a crane, so that when the cylinder arm pin system drives the cylinder arm pin to move, the oil supply is no longer supplied through the movable core tube inside the telescopic oil cylinder, but an independent hydraulic pipeline is used; the hydraulic oil circuit that drives the cylinder arm pin mechanism to move is independent of the movement of the telescopic oil cylinder. The cylinder arm pin control valve assembly and the emergency quick-change joint are transferred from the inside of the boom to the outside of the boom. The system maintenance difficulty and cost are reduced, the cylinder processing difficulty and weight are reduced, and the problem of the movable core tube limiting the inner diameter of the telescopic oil cylinder piston rod is solved, so that the single-cylinder latch system can be extended to small and medium-tonnage products; and the maintainability of the telescopic system is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of heavy machinery, and in particular relates to a single-cylinder latch telescopic system, a control method and a crane. Background Art

[0002] The performance of the crane telescopic system has a critical impact on the overall performance and lifting capacity of the crane. Currently, there are two main types of crane telescopic systems: cylinder and rope telescopic system and single cylinder latch telescopic system. Among them, the single cylinder latch telescopic system realizes the "ropeless" telescopic state, simplifies the internal structure of the crane arm, breaks through the limitations of the crane in terms of arm length and number of sections, and improves the overall performance of the telescopic system.

[0003] The common form of the current single-cylinder latch telescopic system in the industry is: an independent oil supply system is used to supply oil to the cylinder head body through the movable core tube of the telescopic cylinder; the cylinder pin and the arm pin are pulled out through the built-in cylinder of the cylinder head body, and the cylinder pin and the arm pin are reset by a spring; the pressure in the small chamber of the telescopic cylinder is used to open the balance valve to realize the retraction of the telescopic cylinder.

[0004] (2) Brief introduction of the automatic extension and retraction process of single cylinder bolt type crane:

[0005] The combined action of the telescopic cylinder, arm pin and cylinder pin realizes the telescopic function of the boom, which is achieved in the following ways:

[0006] When the arm pin is inserted, the arm pin is inserted into the arm pin hole by the return spring to lock the two adjacent booms together. When the cylinder pin is pulled out, the cylinder pin is separated from the cylinder pin hole on the boom, and the telescopic cylinder and the boom are separated, so that the empty cylinder telescopic can be realized. When the cylinder pin is inserted, the cylinder pin is inserted into the cylinder pin hole on the boom, and the telescopic cylinder and the boom are locked together, so that the telescopic with the boom can be realized.

[0007] Boom extension process:

[0008] Find the arm position forward: pull out the cylinder pin → find the arm position → insert the cylinder pin after finding the arm position → pull out the arm pin → extend the arm with the cylinder → (slow down in advance and release the arm pin) insert the arm pin.

[0009] Find the arm position backward: pull out the cylinder pin → retract the cylinder to find the arm position → find the arm position and insert the cylinder pin → pull out the arm pin → extend the cylinder with the arm → (slow down in advance and release the arm pin) insert the arm pin.

[0010] Boom retraction process:

[0011] Retract the non-current arm: pull out the cylinder pin → find the arm position → insert the cylinder pin → pull out the arm pin → retract the arm → insert the arm pin.

[0012] When retracting the front arm: pull out the arm pin → retract the arm → insert the arm pin.

[0013] The existing single cylinder bolt extension control hydraulic principle is as follows Figure 1As shown. It mainly includes three parts: hydraulic control of telescopic oil cylinder, hydraulic circuit for plugging and pulling out cylinder arm pin and pilot circuit. The extension and retraction of telescopic oil cylinder 14 are controlled by variable hydraulic pump 11 in conjunction with three-position four-way reversing valve 12 and balance valve 13.

[0014] During operation, the displacement of the pump is controlled by adjusting the current output by the controller to the variable hydraulic pump, thereby controlling the movement speed of the telescopic cylinder. The oil direction is changed by reversing the three-position four-way solenoid valve to realize the switching of the extension and retraction of the telescopic cylinder. Among them, the cylinder pin and arm pin pulling actions are completed by another set of hydraulic systems. The oil output by the hydraulic pump 116 passes through the two-position four-way solenoid reversing valve 117, the ball valve 119, the movable core tube 15 in the telescopic cylinder and the cylinder arm pin switching valve 17, and enters the arm pin cylinder 111 or the cylinder pin cylinder 112 to complete the arm pin pulling mechanism 115 or the cylinder pin pulling mechanism 114. The cylinder arm pin switching valve controls the switching of the two actions of pulling the cylinder pin and pulling the arm pin. The overflow valve 118 at the outlet of the hydraulic pump is used for limiting the cylinder arm pin action pressure protection to reduce the pressure shock when pulling the cylinder pin and the arm pin.

[0015] In addition, in order to ensure that the telescopic cylinder can continue to operate in the event of failure of the cylinder arm pin switching valve 17, the system is also designed with an emergency action circuit. By arranging a quick-change joint 19 at the outlet of the hydraulic pump 116 and connecting it to the cylinder arm pin drive pipeline using a hose 110, the emergency action of the cylinder arm pin is achieved. Further explanation: the hose is detachable, and the quick-change joints 19d and 19c at both ends of the hose are disconnected from the hydraulic pump outlet quick-change joint 19e and the cylinder arm pin cylinder outlet under normal circumstances. When the cylinder pin is pulled out in an emergency state, the quick-change joint 19c at one end of the hose is connected to the quick-change joint 19b at the cylinder pin cylinder outlet, and the hydraulic pump outputs oil through the hose into the cylinder pin cylinder to complete the cylinder pin pulling action. When pulling out the arm pin in an emergency, just connect the quick-change joint 19c at one end of the hose to the arm pin cylinder outlet 19a.

[0016] Figure 1 It is a schematic diagram of a telescopic hydraulic system of the prior art.

[0017] Disadvantages of existing technology:

[0018] 1) The principle of the single-cylinder bolt telescopic system is a common technical route in the industry. When the telescopic cylinder is extended and retracted, the flow of the active core tube must be guaranteed while the system pressure must be guaranteed, resulting in large power loss and poor energy saving of the system. At the same time, the active core tube has a complex structure and high processing accuracy requirements, resulting in high prices for telescopic cylinders, and the single-cylinder bolt telescopic system is difficult to promote and apply in small-tonnage products.

[0019] 2) The telescopic cylinder has poor compactness and the cylinder arm pin control valve assembly is also arranged inside the boom, which makes it difficult to maintain. Summary of the invention

[0020] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a single-cylinder latch telescopic system, a control method and a crane to meet the requirements of the telescopic hydraulic system under different working conditions of the telescopic system.

[0021] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0022] The present invention provides a single-cylinder latch retractable system, comprising a single-cylinder latch retractable main system and a cylinder arm pin motion control system;

[0023] The single-cylinder bolt telescopic main system includes a telescopic oil cylinder and a telescopic hydraulic system for driving the telescopic oil cylinder; no movable core tube is provided in the telescopic oil cylinder;

[0024] The cylinder arm pin motion control system comprises a cylinder arm pin mechanism and a cylinder arm pin hydraulic system for driving the cylinder arm pin mechanism to move;

[0025] The telescopic hydraulic system and the cylinder arm pin hydraulic system are independent.

[0026] The effect achieved by the above-mentioned arrangement: the present invention provides a hydraulic system for single-cylinder bolt telescopic movement. When the cylinder arm pin system drives the cylinder arm pin to move, oil is no longer supplied through the movable core tube inside the telescopic cylinder, but an independent hydraulic pipeline is used; the hydraulic oil circuit that drives the cylinder arm pin mechanism to move is independent of the movement of the telescopic cylinder.

[0027] Further, the single-cylinder bolt telescopic main system includes a variable hydraulic pump, a hydraulically controlled proportional reversing valve, a telescopic oil cylinder, and two electric proportional pressure reducing valves;

[0028] The high-pressure oil of the variable hydraulic pump controls the extension and retraction of the telescopic cylinder through the hydraulically controlled proportional reversing valve; the two electric proportional pressure reducing valves respectively control the control pressure at both ends of the valve stem of the hydraulically controlled proportional reversing valve, and the movement of the valve stem of the hydraulically controlled proportional reversing valve can be controlled by adjusting the input current of the electric proportional pressure reducing valve.

[0029] The effect achieved by the above setting is that the displacement of the valve stem of the hydraulic proportional reversing valve is related to the magnitude of the current input to the electric proportional pressure reducing valve. Therefore, the requirements of the telescopic hydraulic system under different working conditions of the telescopic system can be met by adjusting the magnitude of the current output by the controller to the electric proportional pressure reducing valve.

[0030] Furthermore, the system also includes a balancing valve installed between the hydraulically controlled proportional reversing valve and the telescopic cylinder, and one end of the balancing valve is connected to an electric proportional pressure reducing valve three.

[0031] The effect achieved by the above arrangement is as follows: when the telescopic cylinder retracts, the opening of the balance valve can be controlled by adjusting the output current of the electric proportional pressure reducing valve 3 to control the controllability of the boom.

[0032] Furthermore, the cylinder arm pin hydraulic system includes a hydraulic pump, a three-position four-way switching valve, a double hose, an arm pin oil cylinder and a cylinder pin oil cylinder and an oil tank that are connected;

[0033] The cylinder arm pin mechanism comprises a return spring, a cylinder pin structure connected to the cylinder pin oil cylinder, and an arm pin mechanism connected to the arm pin oil cylinder;

[0034] The arm pin oil cylinder comprises a cylinder barrel and an oil cylinder piston rod arranged in the cylinder barrel. The cylinder barrel of the arm pin oil cylinder is fixed, and the inside is divided into a rodless chamber and a rod chamber.

[0035] The cylinder pin oil cylinder comprises a cylinder barrel and a cylinder piston rod arranged in the cylinder barrel. The cylinder barrel of the cylinder pin oil cylinder is fixed, and the interior is divided into a rodless chamber and a rod chamber.

[0036] When the rodless chamber of the cylinder pin oil cylinder moves to the left when oil enters, it pushes the cylinder pin mechanism to move to the left; when the rodless chamber returns oil, the cylinder pin oil cylinder and the cylinder pin mechanism are reset under the action of the reset spring;

[0037] When the arm pin oil cylinder moves to the right when the rodless chamber is filled with oil, the arm pin mechanism is pushed to move to the right; when the rodless chamber is drained of oil, the arm pin oil cylinder and the arm pin mechanism are reset under the action of the reset spring;

[0038] The cylinder arm pin switching valve is a three-position four-way switching valve used to switch between pulling the cylinder pin and pulling the arm pin;

[0039] The double hose is installed between the cylinder pin oil cylinder, the arm pin oil cylinder and the three-position four-way valve;

[0040] When the cylinder arm pin switching valve is powered on in the left position, the high-pressure oil of the hydraulic pump passes through the cylinder arm pin switching valve, through the double hose, and reaches the rodless chamber of the arm pin cylinder; the cylinder piston rod drives the arm pin pulling mechanism to move under the action of the oil pressure, realizing the arm pin pulling;

[0041] When the arm pin needs to be reset, the cylinder arm pin switching valve loses power, the rodless chamber of the arm pin cylinder returns oil, and under the spring force of the reset spring, the oil in the rodless chamber of the arm pin cylinder flows back to the oil tank.

[0042] When the cylinder arm pin switching valve is energized in the right position, the high-pressure oil in the hydraulic pump reaches the rodless chamber of the cylinder pin cylinder through the cylinder arm pin switching valve. The cylinder barrel of the cylinder pin cylinder is fixed, and the cylinder piston rod drives the cylinder pin pulling mechanism under the action of the oil pressure to complete the cylinder pin pulling action.

[0043] When resetting, the oil in the rodless chamber of the cylinder pin cylinder returns through the double hose, the cylinder arm pin switching valve loses power, the oil in the rodless chamber of the cylinder pin cylinder returns, and under the spring force of the reset spring, the oil in the rodless chamber of the cylinder pin cylinder flows back to the oil tank.

[0044] Furthermore, the cylinder arm pin hydraulic system also includes a pipeline holding mechanism, and the pipeline holding mechanism includes:

[0045] a guide device, which is bypassed by the duplex hose; and

[0046] The elastic device is connected to the guide device and is used to keep the double hose in a stretched state by driving the guide device when the telescopic cylinder performs a telescopic action.

[0047] The above arrangement achieves the following effects: Since the movable core tube in the telescopic oil cylinder is eliminated, the cylinder arm pin system of the present invention uses an independent hydraulic pipeline to drive the cylinder arm pin to move. The double hose is guided and tensioned by the guide device and the elastic device. When the telescopic oil cylinder is extended and retracted, the double hose is tensioned under the action of the elastic device to ensure smooth oil supply.

[0048] Furthermore, a right ball valve is provided between the three-position four-way switching valve and the arm pin oil cylinder; a left ball valve is provided between the three-position four-way switching valve and the cylinder pin oil cylinder;

[0049] A quick-change joint a is provided between the right ball valve and the arm pin cylinder, a quick-change joint b is provided between the left ball valve and the cylinder pin cylinder, a quick-change joint e is provided between the left ball valve and the hydraulic pump, and the quick-change joint b and the quick-change joint e are directly provided with hoses having quick-change joints c and quick-change joints d connected at both ends.

[0050] The effect achieved by the above settings is: when emergency cylinder pin extraction is required, close the left ball valve, connect the quick-change connector e with the quick-change connector d of the hose; at the same time, the quick-change connector c at the other end of the hose is connected to the quick-change connector b. The high-pressure oil of the hydraulic pump is connected to the double hose system through the emergency hose. The high-pressure oil enters the rodless chamber of the cylinder pin oil cylinder to complete the emergency cylinder pin extraction.

[0051] When the arm pin is pulled out in an emergency, close the right ball valve, connect an external high-pressure oil source through a quick-change joint, and the high-pressure oil reaches the rodless chamber of the arm pin cylinder to realize the emergency pulling out of the arm pin.

[0052] Furthermore, the three-position four-way switching valve is arranged outside the boom.

[0053] The above arrangement achieves the following effects: Compared with the original solution, replacement and maintenance of the cylinder arm pin switching valve are more convenient; at the same time, the double hose is arranged outside the telescopic cylinder, which greatly improves maintainability.

[0054] In a second aspect, the present invention provides a single-cylinder latch extension system control method, based on the system described in the first aspect, comprising the following steps:

[0055] The requirements of the telescopic hydraulic system under different working conditions of the telescopic system can be met by adjusting the current output to the proportional valve pressure reducing valve.

[0056] Furthermore, the method also includes a cylinder arm pin mechanism action method and / or an emergency control method:

[0057] The cylinder arm pin mechanism action method comprises:

[0058] The cylinder arm pin switching valve is powered to the left position to work, and the high-pressure oil of the hydraulic pump passes through the cylinder arm pin switching valve, through the double hose, and reaches the rodless chamber of the arm pin cylinder; the cylinder piston rod drives the arm pin pulling mechanism to move under the action of the oil pressure to pull the arm pin;

[0059] When the arm pin needs to be reset, the cylinder arm pin switching valve is de-energized, the rodless chamber of the arm pin cylinder returns oil, and under the spring force of the reset spring, the oil in the rodless chamber of the arm pin cylinder flows back to the oil tank.

[0060] When the cylinder arm pin switching valve is energized to the right position, the high-pressure oil in the hydraulic pump reaches the rodless chamber of the cylinder pin cylinder through the cylinder arm pin switching valve. The cylinder barrel of the cylinder pin cylinder is fixed, and the cylinder piston rod drives the cylinder pin pulling mechanism under the action of the oil pressure to complete the cylinder pin pulling action.

[0061] When resetting, the oil in the rodless chamber of the cylinder pin cylinder returns through the double hose, the cylinder arm pin switching valve loses power, the oil in the rodless chamber of the cylinder pin cylinder returns, and under the spring force of the reset spring, the oil in the rodless chamber of the cylinder pin cylinder flows back to the oil tank.

[0062] The emergency control method comprises:

[0063] When emergency cylinder pin extraction is required, close the left ball valve, connect the quick-change connector e with the quick-change connector d of the hose; at the same time, connect the quick-change connector c at the other end of the hose with the quick-change connector b. The high-pressure oil of the hydraulic pump is connected to the double hose system through the emergency hose. The high-pressure oil enters the rodless chamber of the cylinder pin oil cylinder to complete the emergency cylinder pin extraction.

[0064] When the arm pin is pulled out in an emergency, close the right ball valve, connect an external high-pressure oil source through a quick-change joint, and the high-pressure oil reaches the rodless chamber of the arm pin cylinder to realize the emergency pulling out of the arm pin.

[0065] In a third aspect, the present invention provides a crane comprising the single-cylinder latch retractable system as described in the first aspect.

[0066] Compared with the prior art, the present invention has the following beneficial effects:

[0067] 1. The present invention provides a single-cylinder bolt telescopic hydraulic system. When the cylinder arm pin system drives the cylinder arm pin to move, it no longer supplies oil through the movable core tube inside the telescopic oil cylinder, but uses an independent hydraulic pipeline; the hydraulic oil circuit that drives the cylinder arm pin mechanism to move is independent of the movement of the telescopic oil cylinder. The cylinder arm pin control valve assembly and the emergency quick-change joint can be arranged outside the crane arm as needed, which improves the maintainability.

[0068] 2. This system eliminates the movable core tube in the telescopic cylinder, simplifies the structure of the telescopic cylinder, reduces the processing difficulty and weight, and reduces the system cost; reduces the difficulty and cost of system maintenance, reduces the difficulty and weight of cylinder processing, and at the same time, overcomes the difficulty of "the movable core tube restricts the inner diameter of the telescopic cylinder piston rod", so that the single-cylinder latch system can be extended to small and medium-tonnage products. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 It is a schematic diagram of the telescopic hydraulic system of the prior art;

[0070] Figure 2 It is a schematic diagram of the telescopic hydraulic system of the present invention;

[0071] In the figure: 11, variable hydraulic pump; 12, three-position four-way reversing valve; 13, balance valve; 14, telescopic hydraulic cylinder; 15, movable core tube; 16, one-way valve; 17, cylinder arm pin switching valve; 18, damping; 19, quick-change connector; 110, hose; 111, arm pin cylinder; 112, cylinder pin cylinder; 113, return spring; 114, cylinder pin mechanism; 115, arm pin mechanism; 116, hydraulic pump; 117, two-position four-way electromagnetic reversing valve; 118, relief valve; 119, ball valve;

[0072] 21. Variable hydraulic pump; 22. Electric proportional pressure reducing valve 1; 23. Electric proportional pressure reducing valve 2; 24. Hydraulic proportional reversing valve; 25. Electric proportional pressure reducing valve 3; 26. Balance valve; 27. Arm pin mechanism; 28. Cylinder pin mechanism; 29. ​​Return spring; 210. Cylinder pin oil cylinder; 211. Arm pin oil cylinder; 212. Double hose; 213. Guide device; 214. Elastic device; 215. Telescopic oil cylinder; 216. Quick-change connector; 217. Hose; 218. Ball valve; 218a. Left ball valve; 218b. Right ball valve; 219. Cylinder arm pin switching valve; 220. Hydraulic pump;

[0073] In the figure, 216a, 216b, 216c, 216d, and 216e represent quick-change connectors a, b, c, d, and e in five different positions, 218a and 218b represent the left ball valve and the right ball valve, and Y4a and Y4b represent the left position and the right position of the three-position four-way valve, respectively. DETAILED DESCRIPTION

[0074] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0075] In the description of this embodiment, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this embodiment and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this embodiment.

[0076] Embodiment 1:

[0077] The present embodiment provides a hydraulic system for telescopic extension of a single-cylinder latch, comprising a single-cylinder latch telescopic main system and a cylinder arm pin motion control system; the single-cylinder latch telescopic main system comprises a telescopic oil cylinder and a telescopic hydraulic system for driving the telescopic oil cylinder; no movable core tube is arranged in the telescopic oil cylinder; the cylinder arm pin motion control system comprises a cylinder arm pin mechanism and a cylinder arm pin hydraulic system for driving the cylinder arm pin mechanism to move; the telescopic hydraulic system and the cylinder arm pin hydraulic system are independent.

[0078] When the cylinder arm pin system drives the cylinder arm pin to move, oil is no longer supplied through the movable core tube inside the telescopic cylinder, but an independent hydraulic pipeline is used; the hydraulic oil circuit that drives the cylinder arm pin mechanism to move is independent of the movement of the telescopic cylinder.

[0079] The cylinder arm pin control valve assembly and emergency quick-change connector can be arranged outside the boom as needed, improving maintainability.

[0080] The system eliminates the movable core tube in the telescopic cylinder, thus simplifying the structure of the telescopic cylinder, reducing the processing difficulty and weight, and reducing the system cost; at the same time, it overcomes the difficulty of "the movable core tube restricting the inner diameter of the telescopic cylinder piston rod", allowing the single-cylinder latch system to be extended to small and medium-tonnage products.

[0081] The hydraulic principle diagram of the single cylinder bolt retractable system is as follows Figure 2 As shown, the high-pressure oil of the variable hydraulic pump 21 controls the extension and retraction of the telescopic cylinder 215 through the hydraulic proportional reversing valve 24. The two electric proportional pressure reducing valves Y1-22 and Y2-23 respectively control the control pressure at both ends of the valve stem of the hydraulic proportional reversing valve. Therefore, the movement of the valve stem of the hydraulic proportional reversing valve can be controlled by adjusting the input current of the electric proportional pressure reducing valve, that is, the displacement of the valve stem of the hydraulic proportional reversing valve is related to the input current of the electric proportional pressure reducing valve. Therefore, the requirements of the telescopic hydraulic system under different working conditions of the telescopic system can be met by adjusting the current output by the controller to the electric proportional pressure reducing valve.

[0082] It should be noted that when the telescopic cylinder retracts, the opening of the telescopic balance valve 26 can be controlled by adjusting the output current of the electric proportional pressure reducing valve Y325 to control the controllability of the arm.

[0083] Figure 2 This is the hydraulic principle diagram of the telescopic system.

[0084] The present invention provides a hydraulic system for driving a cylinder arm pin mechanism to move so that the hydraulic oil circuit for controlling the movement of the cylinder arm pin mechanism and the movement of the telescopic oil cylinder do not affect each other.

[0085] The cylinder arm pin motion control system of this embodiment includes a cylinder arm pin mechanism 27 and a cylinder arm pin hydraulic system for driving the cylinder arm pin mechanism 27 to move;

[0086] The cylinder arm pin hydraulic system includes a hydraulic pump 220, a three-position four-way switching valve, a double hose 217212, an arm pin oil cylinder 211 and a cylinder pin oil cylinder 210 which are connected;

[0087] The cylinder arm pin mechanism 27 includes a cylinder pin structure connected to the cylinder pin oil cylinder 210 and an arm pin mechanism 27 connected to the arm pin oil cylinder 211 .

[0088] The cylinder pin cylinder 210 is used to control the locking or separation of the telescopic part of the telescopic cylinder 215 and the arm section of the telescopic arm by driving the cylinder pin of the telescopic arm to be inserted and pulled out. The arm pin cylinder 211 is used to control the locking or separation of two adjacent arm sections by driving the arm pin of the telescopic arm to be inserted and pulled out, so that the telescopic part of the telescopic cylinder 215 can drive the arm section to be extended and retracted when it is extended and retracted relative to the fixed part of the telescopic cylinder 215. The cylinder arm pin hydraulic system is also provided with an oil supply circuit allowing the hydraulic oil to flow to the arm pin cylinder 211 and the cylinder pin cylinder 210, and an oil discharge circuit allowing the hydraulic oil to be discharged from the arm pin cylinder 211 and the cylinder pin cylinder 210.

[0089] The arm pin oil cylinder 211 includes a cylinder barrel and an oil cylinder piston rod disposed in the cylinder barrel. The cylinder barrel of the arm pin oil cylinder 211 is fixed, and the inside is divided into a rodless chamber and a rod chamber.

[0090] The cylinder pin oil cylinder 210 includes a cylinder barrel and a cylinder piston rod disposed in the cylinder barrel. The cylinder barrel of the cylinder pin oil cylinder 210 is fixed, and the interior is divided into a rodless chamber and a rod chamber.

[0091] And wherein, the cylinder pin oil cylinder 210 is a double-acting single-rod oil cylinder, when the cylinder pin oil cylinder 210 drives the cylinder pin to be pulled out, the rod chamber of the cylinder pin oil cylinder 210 is connected with the oil supply oil circuit, and when the cylinder pin oil cylinder 210 drives the cylinder pin to be inserted, the rod chamber of the cylinder pin oil cylinder 210 is connected with the rodless chamber to form a differential oil cylinder and is connected with the oil discharge oil circuit;

[0092] The arm pin cylinder 211 is a double-acting single-rod cylinder. When the arm pin cylinder 211 drives the arm pin to be pulled out, the rod chamber of the arm pin cylinder 211 is connected with the oil supply circuit. When the arm pin cylinder 211 drives the arm pin to be inserted, the rod chamber of the arm pin cylinder 211 is connected with the rodless chamber to form a differential cylinder and is connected with the oil discharge circuit.

[0093] The hydraulic pump 220 serves as the oil source for the cylinder arm pin pulling system, and the three-position four-way switching valve 219 serves as the cylinder arm pin control valve for switching between cylinder pin pulling and arm pin pulling. When the cylinder arm pin switching valve Y4a is energized and works in the left position, the high-pressure oil of the hydraulic pump passes through the cylinder arm pin switching valve 219, the ball valve 218b, and the double hose 212 to reach the rodless chamber of the arm pin cylinder 211. The cylinder barrel of the arm pin cylinder is fixed, and the cylinder piston rod drives the arm pin pulling mechanism 27 to move under the action of the oil pressure to realize the arm pin pulling. When the arm pin needs to be reset, the cylinder arm pin switching valve loses power, and the rodless chamber of the arm pin cylinder returns oil. Under the spring force of the reset spring 29, the oil in the rodless chamber flows back to the oil tank.

[0094] When the cylinder arm pin switching valve Y4b is energized, it works in the right position. The high-pressure oil in the hydraulic pump reaches the rodless chamber of the cylinder pin oil cylinder 210 through the cylinder arm pin switching valve. The cylinder barrel of the cylinder pin oil cylinder is fixed. Under the action of the oil pressure, the cylinder piston rod drives the cylinder pin pulling mechanism 28 to move and complete the cylinder pin pulling action. When resetting, the oil in the rodless chamber of the cylinder pin oil cylinder returns through the double hose. The resetting principle of the cylinder pin is similar to that of the arm pin, so it will not be repeated.

[0095] The double hose 212 is installed between the cylinder, the arm pin oil cylinder 210, 211 and the three-position four-way valve 219;

[0096] The cylinder arm pin hydraulic system also includes a guide device 213 and an elastic device 214;

[0097] The double hose 212 is guided and tensioned by the guide device 213 and the elastic device 214. In some embodiments, the pipeline holding mechanism includes: a guide device 213 and an elastic device 214. The double hose 212 can avoid folding by bypassing the guide device 213, and can translate and rotate with the movement of the guide device 213. The elastic device 214 is connected to the guide device 213, and is used to drive the guide device 213 to keep the double hose 212 in a stretched state when the telescopic cylinder performs a telescopic action. In other words, the elastic device 214 applies a force to the guide device 213 away from the cylinder rod end, so that the double hose 212 is in a stretched state.

[0098] The guide device 213 is a movable pulley, and the elastic device 214 is a tension spring, an elastic rope or a coil spring. The movable pulley is bypassed by the double hose 212; the elastic device is connected to the movable pulley and is used to drive the movable pulley to keep the flexible conveying pipeline in a stretched state when the telescopic oil cylinder performs a telescopic action.

[0099] Considering that the double hose 212 may overlap and squeeze itself during the telescopic cylinder extension process, or be squeezed by other components in the single-cylinder latch telescopic system or telescopic arm system, this may cause problems such as poor flow of the fluid working medium or pipeline damage. Therefore, in some embodiments of the present invention, the single-cylinder latch telescopic system also includes a pipeline holding mechanism, which acts on the double hose 212 and is used to maintain the stretched state of the double hose 212 when the telescopic cylinder performs a telescopic action. The pipeline holding mechanism maintains the stretched state of the double hose 212 when the telescopic cylinder performs a telescopic action, so that the double hose 212 is always in a non-extruded and folded stretched state, thereby maintaining a smooth flow of the fluid working medium.

[0100] The elastic device 214 preferably adopts an elastic element, such as a tension spring, an elastic rope or a coil spring, which can make the structure more compact and low-cost. In other embodiments, the elastic device 214 can also adopt a hoisting mechanism or a piston cylinder mechanism that can adjust the tension accordingly with the telescopic action of the telescopic cylinder.

[0101] It should be further explained that, since the movable core tube in the telescopic oil cylinder is eliminated, the cylinder arm pin system of the present invention uses an independent hydraulic pipeline to drive the cylinder arm pin to move. The double hose 212 is guided and tensioned by the guide device 213 and the elastic device 214. When the telescopic oil cylinder is extended and retracted, the double hose 212 is tensioned under the action of the elastic device to ensure smooth oil supply.

[0102] In this embodiment, there are five quick-change connectors 216: quick-change connector a216a, quick-change connector b216b, quick-change connector c216c, quick-change connector d216d, and quick-change connector e216e.

[0103] A quick-change joint a216a is provided between the right ball valve and the arm pin cylinder, a quick-change joint b216b is provided between the left ball valve and the cylinder pin cylinder, a quick-change joint e216e is provided between the left ball valve and the hydraulic pump, and the quick-change joint b216b and the quick-change joint e216e are directly provided with hoses with quick-change joints c216c and quick-change joints d216d connected at both ends.

[0104] This embodiment also provides a single-cylinder latch retractable system control method, including a cylinder arm pin mechanism action method and / or an emergency control method:

[0105] The cylinder arm pin mechanism action method of this embodiment includes:

[0106] The cylinder arm pin switching valve is powered to the left position to work, and the high-pressure oil of the hydraulic pump passes through the cylinder arm pin switching valve, through the double hose, and reaches the rodless chamber of the arm pin cylinder; the cylinder piston rod drives the arm pin pulling mechanism to move under the action of the oil pressure to pull the arm pin;

[0107] When the arm pin needs to be reset, the cylinder arm pin switching valve is de-energized, the rodless chamber of the arm pin cylinder returns oil, and under the spring force of the reset spring, the oil in the rodless chamber of the arm pin cylinder flows back to the oil tank.

[0108] When the cylinder arm pin switching valve is energized to the right position, the high-pressure oil in the hydraulic pump reaches the rodless chamber of the cylinder pin cylinder through the cylinder arm pin switching valve. The cylinder barrel of the cylinder pin cylinder is fixed, and the cylinder piston rod drives the cylinder pin pulling mechanism under the action of the oil pressure to complete the cylinder pin pulling action.

[0109] When resetting, the oil in the rodless chamber of the cylinder pin cylinder returns through the double hose, the cylinder arm pin switching valve loses power, the oil in the rodless chamber of the cylinder pin cylinder returns, and under the spring force of the reset spring, the oil in the rodless chamber of the cylinder pin cylinder flows back to the oil tank.

[0110] The cylinder arm pin emergency action control method of this embodiment includes the following steps:

[0111] By adjusting the current output to the proportional valve pressure reducing valve, the requirements of the telescopic hydraulic system under different working conditions of the telescopic system can be met;

[0112] When emergency cylinder pin extraction is required, close the left ball valve 218a, connect the quick-change connector e 216e with the quick-change connector d216d of the hose 217; at the same time, connect the quick-change connector c216c at the other end of the hose with the quick-change connector b216b. The high-pressure oil of the hydraulic pump is connected to the double hose system through the emergency hose. The high-pressure oil enters the rodless chamber of the cylinder pin oil cylinder to complete the emergency cylinder pin extraction.

[0113] When the arm pin is pulled out in an emergency, close the right ball valve 218b, connect an external high-pressure oil source through a quick-change joint, and the high-pressure oil reaches the rodless chamber of the arm pin cylinder to realize the emergency pulling out of the arm pin.

[0114] It should be further explained that the cylinder arm pin switching valve 219 in the present invention is arranged outside the lifting arm, which makes the replacement and maintenance of the cylinder arm pin switching valve more convenient than the original solution; at the same time, the double hose is arranged outside the telescopic cylinder, which greatly improves the maintainability.

[0115] Implementation principle: The present invention realizes emergency cylinder arm pin extraction through a combination of a ball valve and a quick-change joint (which can be completely installed inside the arm or outside the arm).

[0116] The present invention improves the reliability and maintainability of the telescopic system, reduces weight and cost: provides a hydraulic system and control method for controlling the action of a cylinder arm pin mechanism, so that the hydraulic oil circuit driving the action of the cylinder arm pin mechanism and the action of the telescopic oil cylinder do not affect each other, thus avoiding interference between systems. When the cylinder arm pin system of the present invention drives the cylinder arm pin to move, it is no longer necessary to supply oil through the movable core tube inside the telescopic oil cylinder, but an independent hydraulic pipeline is used;

[0117] When the cylinder arm pin system drives the cylinder arm pin to move, it no longer supplies oil through the active core tube inside the telescopic cylinder, but uses an independent hydraulic pipeline; the hydraulic oil circuit that drives the cylinder arm pin mechanism is independent of the movement of the telescopic cylinder. The cylinder arm pin control valve assembly can be arranged inside or outside the boom according to design requirements, which improves the convenience of maintenance, and eliminates the active core tube in the telescopic cylinder, simplifies the structure of the telescopic cylinder, reduces the difficulty of processing, and greatly reduces the cost of the telescopic cylinder. The weight of the cylinder can be reduced by 100-400Kg.

[0118] In addition, the present invention solves the contradiction of "the movable core tube limiting the inner diameter of the telescopic oil cylinder piston rod".

[0119] In the present invention, the following means can be used to replace the technical solution of the present invention:

[0120] 1) The three-position four-way valve 219 can be replaced with two two-position three-way valves to switch the cylinder arm pin function, but the cost will increase. The ball valve 218 can be operated manually or electrically, and the present invention has no limitation.

[0121] 2) If the three-position four-way valve 219 that controls the action of the cylinder arm pin is installed inside the boom, it can also realize the function of pulling out the cylinder arm pin, but the maintainability of the valve will be deteriorated.

[0122] Embodiment 2:

[0123] This embodiment provides a crane, including the single-cylinder latch retractable system as described in the first embodiment.

[0124] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features, and in the description of the present invention, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0125] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0126] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0127] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0128] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A single cylinder bolt retractable system, characterized in that: It includes a single cylinder bolt extension main system and a cylinder arm pin motion control system; The single-cylinder bolt telescopic main system includes a telescopic oil cylinder and a telescopic hydraulic system for driving the telescopic oil cylinder; no movable core tube is provided in the telescopic oil cylinder; The cylinder arm pin motion control system comprises a cylinder arm pin mechanism and a cylinder arm pin hydraulic system for driving the cylinder arm pin mechanism to move; The telescopic hydraulic system and the cylinder arm pin hydraulic system are independent; The cylinder arm pin hydraulic system includes a hydraulic pump, a cylinder arm pin switching valve, a double hose, an arm pin oil cylinder and a cylinder pin oil cylinder and an oil tank that are connected; The cylinder arm pin mechanism comprises a return spring, a cylinder pin mechanism connected to the cylinder pin oil cylinder, and an arm pin mechanism connected to the arm pin oil cylinder; The arm pin oil cylinder comprises a cylinder barrel and an oil cylinder piston rod arranged in the cylinder barrel. The cylinder barrel of the arm pin oil cylinder is fixed, and the inside is divided into a rodless chamber and a rod chamber. The cylinder pin oil cylinder comprises a cylinder barrel and a cylinder piston rod arranged in the cylinder barrel. The cylinder barrel of the cylinder pin oil cylinder is fixed, and the interior is divided into a rodless chamber and a rod chamber. When the rodless chamber of the cylinder pin oil cylinder is filled with oil and moves to the left, the cylinder pin mechanism is pushed to move to the left; when the rodless chamber of the cylinder pin oil cylinder is returned to oil, the cylinder pin oil cylinder and the cylinder pin mechanism are reset under the action of the reset spring; When the arm pin oil cylinder moves to the right when oil enters the rodless chamber, it pushes the arm pin mechanism to move to the right; When the rodless chamber of the arm pin oil cylinder returns oil, the arm pin oil cylinder and the arm pin mechanism are reset under the action of the reset spring; The cylinder arm pin switching valve is a three-position four-way switching valve used to switch between pulling the cylinder pin and pulling the arm pin; The double hose is installed between the cylinder pin oil cylinder, the arm pin oil cylinder and the three-position four-way valve; When the cylinder arm pin switching valve is powered on in the left position, the high-pressure oil of the hydraulic pump flows from the cylinder arm pin switching valve through the double hose to the rodless chamber of the arm pin cylinder; The piston rod of the arm pin oil cylinder drives the arm pin pulling mechanism to move under the action of oil pressure, thereby pulling out the arm pin; When the arm pin needs to be reset, the cylinder arm pin switching valve loses power, the rodless chamber of the arm pin oil cylinder returns oil, and under the spring force of the reset spring, the oil in the rodless chamber of the arm pin oil cylinder flows back to the oil tank; When the cylinder arm pin switching valve is in the right position and is energized, the high-pressure oil in the hydraulic pump reaches the rodless chamber of the cylinder pin cylinder through the cylinder arm pin switching valve. The cylinder barrel of the cylinder pin cylinder is fixed, and the cylinder piston rod of the cylinder pin cylinder drives the cylinder pin pulling mechanism to move under the action of the oil pressure, completing the cylinder pin pulling action; When resetting, the oil in the rodless chamber of the cylinder pin cylinder returns through the double hose, the cylinder arm pin switching valve loses power, the oil in the rodless chamber of the cylinder pin cylinder returns, and under the spring force of the reset spring, the oil in the rodless chamber of the cylinder pin cylinder flows back to the oil tank.

2. The single cylinder latch retractable system according to claim 1, characterized in that: The single-cylinder bolt telescopic main system includes a variable hydraulic pump, a hydraulically controlled proportional reversing valve, a telescopic oil cylinder, and two electric proportional pressure reducing valves; The high-pressure oil of the variable hydraulic pump controls the extension and retraction of the telescopic cylinder through the hydraulically controlled proportional reversing valve; The two electric proportional pressure reducing valves respectively control the control pressure at both ends of the valve stem of the hydraulic controlled proportional reversing valve, and can control the movement of the valve stem of the hydraulic controlled proportional reversing valve by adjusting the input current of the electric proportional pressure reducing valve.

3. The single cylinder latch retractable system according to claim 2, characterized in that: The telescopic hydraulic system also includes a balancing valve installed between the hydraulically controlled proportional reversing valve and the telescopic oil cylinder. One end of the balancing valve is connected to an electric proportional pressure reducing valve three, and the electric proportional pressure reducing valve three is used to adjust the opening of the balancing valve.

4. The single cylinder latch retractable system according to claim 1, characterized in that: The cylinder arm pin hydraulic system further includes a pipeline holding mechanism, and the pipeline holding mechanism includes: a guide device, which is bypassed by the duplex hose; and The elastic device is connected to the guide device and is used to keep the double hose in a stretched state by driving the guide device when the telescopic cylinder performs a telescopic action.

5. The single cylinder latch retractable system according to claim 2, characterized in that: A right ball valve is also provided between the three-position four-way switching valve and the arm pin oil cylinder; a left ball valve is also provided between the three-position four-way switching valve and the cylinder pin oil cylinder; A quick-change joint a is provided between the right ball valve and the arm pin cylinder, a quick-change joint b is provided between the left ball valve and the cylinder pin cylinder, a quick-change joint e is provided between the left ball valve and the hydraulic pump, and the quick-change joint b and the quick-change joint e are directly provided with hoses having quick-change joints c and quick-change joints d connected at both ends.

6. The single cylinder latch retractable system according to claim 1, characterized in that: The three-position four-way switching valve is arranged outside the boom.

7. A single cylinder latch extension system control method, characterized in that: The single-cylinder bolt retracting system according to claim 2 comprises the following steps: The requirements of the telescopic hydraulic system under different working conditions of the single-cylinder bolt telescopic system can be met by adjusting the current output to the proportional pressure reducing valve.

8. A single cylinder bolt extension system control method, characterized in that: Based on the single-cylinder latch retractable system according to claim 5, the method further includes a cylinder arm pin mechanism action method and / or an emergency control method: The cylinder arm pin mechanism action method comprises: The cylinder arm pin switching valve is powered to the left position to work, and the high-pressure oil of the hydraulic pump passes through the cylinder arm pin switching valve, through the double hose, and reaches the rodless chamber of the arm pin cylinder; the cylinder piston rod of the arm pin cylinder drives the arm pin pulling mechanism to move under the action of the oil pressure, realizing the arm pin pulling; When the arm pin needs to be reset, the cylinder arm pin switching valve is de-energized, the rodless chamber of the arm pin oil cylinder returns oil, and under the spring force of the reset spring, the oil in the rodless chamber of the arm pin oil cylinder flows back to the oil tank; When the cylinder arm pin switching valve is powered to the right position, the high-pressure oil in the hydraulic pump reaches the rodless chamber of the cylinder pin cylinder through the cylinder arm pin switching valve. The cylinder barrel of the cylinder pin cylinder is fixed, and the cylinder piston rod of the cylinder pin cylinder drives the cylinder pin pulling mechanism to move under the action of the oil pressure, completing the cylinder pin pulling action; When resetting, the oil in the rodless chamber of the cylinder pin oil cylinder returns through the double hose, the cylinder arm pin switching valve loses power, the rodless chamber of the cylinder pin oil cylinder returns oil, and under the spring force of the reset spring, the oil in the rodless chamber of the cylinder pin oil cylinder flows back to the oil tank; The emergency control method comprises: When emergency cylinder pin removal is required, close the left ball valve, connect the quick-change connector e with the quick-change connector d of the hose; at the same time, connect the quick-change connector c at the other end of the hose with the quick-change connector b; The high-pressure oil of the hydraulic pump is connected to the double hose system through the emergency hose; High-pressure oil enters the rodless chamber of the cylinder pin oil cylinder to complete the emergency cylinder pin extraction; When emergency arm pin is pulled out, close the right ball valve, connect the high-pressure oil source through the quick-change joint, and the high-pressure oil reaches the rodless chamber of the arm pin cylinder to realize emergency arm pin pulling out.

9. A crane, characterized in that: It comprises a single cylinder latch retracting system as described in any one of claims 1 to 6.

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