Multi-valve parallel synchronous control telescopic device for ultra-large hoisting machinery

Abstract

A multi-valve parallel synchronous control telescopic device for ultra-large hoisting machinery comprises a cylinder barrel, a piston, a piston rod, a guide sleeve and a lug ring, a plurality of valve holes are formed in the lug ring in parallel, end covers are arranged at the two ends of each valve hole, a control valve is arranged in each valve hole, a control cavity is formed between each control valve and the corresponding end cover, and a core pipe is arranged in the piston rod. The oil outlet ends of the control valves are communicated and then connected with the rodless cavity through the core pipe, and the control cavities of the control valves are communicated and then connected with the rod cavity through the core pipe. Through the innovative design of multi-valve parallel built-in plug-in mounting, oil port series arrangement, inclined hole through oil path and the like, the problems of large occupied space, high oil leakage risk, poor control stability and the like caused by external arrangement of a valve group in the prior art are effectively solved, and the ultra-large wheeled crane telescopic device is rapid and stable in telescopic, accurate in suspended load control and high in safety. And meanwhile, the reliability, the lightweight level and the maintenance convenience of the system are improved, and the use requirements of the all-ground wheeled crane under the requirements of complex working conditions, frequent transition and high maneuverability are met.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery technology, specifically to a multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery. Background Technology

[0002] All-terrain wheeled cranes, as high-end engineering equipment combining the rapid mobility of truck cranes and the powerful lifting capacity of crawler cranes, rely heavily on the performance of their telescopic boom systems to determine the overall operational efficiency and safety. The telescopic devices used in ultra-large wheeled cranes are responsible for driving the extension and retraction of each telescopic boom section. Currently, most adopt single-cylinder pin-type telescopic systems with hydraulic drive.

[0003] During actual operation, when the telescopic device descends and retracts, the direction of gravity of the cylinder and boom pin structure, the direction of hydraulic drive, and the direction of telescopic device retraction are all the same as the direction of telescopic device movement and retraction. This can easily lead to overload phenomena during the descent, causing collisions between the telescopic device and the entire boom, as well as collisions between the drive boom and the boom itself. In severe cases, this can cause boom breakage or even a rollover accident. Simultaneously, while the guide rails provide protection and guidance before the telescopic hydraulic cylinder enters the next boom section at the end of its stroke, the high speed of the telescopic cylinder and the varying boom surface area during the climbing process can cause the climbing end component of the telescopic hydraulic cylinder to sway left and right and jump up and down, resulting in collisions between the telescopic hydraulic cylinder, the entire boom, and various structural components within the boom.

[0004] All-terrain wheeled cranes face stringent technical challenges: First, space and weight constraints are stringent, requiring an extremely compact and lightweight upper structure, which traditional external valve assembly arrangements with lengthy pipelines cannot meet. Second, the operating conditions are complex and variable, requiring the hydraulic system to withstand frequent start-stop cycles and complex dynamic load impacts, demanding high stability. Third, high reliability is required, as equipment maintenance is difficult at remote construction sites, necessitating improvements in the reliability and fault tolerance of the hydraulic system, especially key safety control components. Fourth, high requirements for micro-motion performance and handling quality are required, demanding excellent micro-motion performance and smooth handling in confined spaces or precision assembly operations, which contradicts the high flow capacity required for heavy-duty operations.

[0005] The piston rod lugs of existing ultra-large wheeled crane telescopic devices mostly adopt external plate-type balance valve assemblies, which have many drawbacks: the valve assembly is large in size and weight, occupies a lot of space, is prone to collision with the overall machine structure, and restricts the development of lightweight development of the whole machine; there are oil leakage points at the junction of the balance valve and the piston rod lug, and there is also a risk of oil leakage at the multiple process holes machined on the end face of the lug; the hydraulic system flow is unstable and it is difficult to meet the lifting requirements of ultra-large tonnage; the telescopic device is prone to failures such as telescopic impact, retraction rebound, and running vibration, with poor micro-motion effect and poor control performance, which cannot adapt to the development trend of ultra-large tonnage all-terrain cranes with multi-section booms, long booms, and ultra-high and far-reaching lifting conditions.

[0006] In existing control schemes, single-valve schemes suffer from large valve core size and mass, slow dynamic response, and are prone to severe pressure shocks during opening and closing, resulting in a single point of failure and insufficient reliability. While main-auxiliary valve schemes can improve low-speed performance, the hydraulic shock problem during main valve operation still exists, system redundancy improvement is limited, and control logic is complex. Existing parallel schemes mostly focus on adjusting flow through combinations of valves of different specifications or pursuing smoothness through time-sharing interleaved control, requiring the management of components of different specifications or relying on complex timing control algorithms, increasing system cost and control complexity, and lacking in extreme synchronization and simple and effective hardware redundancy construction. Therefore, there is an urgent need for an innovative hydraulic control scheme that can fundamentally adapt to the unique working characteristics and platform constraints of all-terrain wheeled cranes. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery. It aims to solve the problems of large space occupation due to the external valve group, resulting in low lightweight level, high oil leakage failure rate leading to unstable use quality, poor operation stability resulting in low operation accuracy, and insufficient reliability leading to difficulty in reliability evaluation.

[0008] This invention is achieved through the following technical solution: a multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery, comprising a cylinder, a piston, a piston rod, a guide sleeve, and an ear ring. Multiple valve holes are arranged in parallel within the ear ring. End caps I and II are respectively provided at both ends of each valve hole. A control valve is provided within each valve hole, located near end cap II. A sealed cavity formed between the control valve and end cap I serves as the control chamber of the control valve. The piston rod contains core tubes I, II, and III. The oil outlets of the multiple control valves are connected and then connected to the rodless chamber of the hydraulic cylinder via core tube III. The control chambers of the multiple control valves are connected and then connected to the rod chamber of the hydraulic cylinder via core tube I. Core tube III connects to the cylinder arm pin chamber. A control valve includes a valve body, a valve core, a check valve, a valve cover, a plunger, and a plunger sleeve. The valve cover is located at one end of the valve body near end cover II. A spring is provided between the valve cover and the valve core. The plunger sleeve is located at the other end of the valve body. A plunger is provided between the plunger sleeve and the valve core. The check valve is located at one end of the valve core. One end of the check valve abuts against the inner wall of the valve core, and the check valve spring abuts against the plunger. One end of the plunger is connected to the plunger sleeve, and the other end of the plunger is connected to the valve core. A radial through hole is provided at the connection between the two ends of the plunger. A damping plug is provided at the connection end between the plunger and the valve core. The damping hole of the damping plug communicates with the radial through hole and the internal space of the check valve. The valve body has several valve body oil inlet holes at one end near the valve cover and several valve body oil outlet holes at the other end near the plunger sleeve. The valve body oil inlet holes and valve body oil outlet holes are isolated from each other. The valve holes are provided with oil passages that cooperate with the valve body oil inlet holes and valve body oil outlet holes. The oil passages between adjacent valve holes are connected together. The valve core is provided with valve core oil inlet holes and valve core oil outlet holes that communicate with the valve body oil inlet holes and valve body oil outlet holes. The valve core oil inlet holes and valve core oil outlet holes are connected in the valve core and the connection and closure between the valve core oil inlet holes and valve core oil outlet holes are controlled by a one-way valve.

[0009] The earring is used to connect with the main arm. The middle part of the earring is square, and the left, right, top, and bottom are four planes. The earring is welded to the rod.

[0010] End cap I and end cap II are connected to the end face of the earring by screws, and O-rings and retaining rings are provided at the connection between end cap I and end cap II and the earring.

[0011] The valve body and the valve hole are provided with three seals, namely an O-ring and a back-to-back double retaining ring. The O-ring is located in the middle of the back-to-back double retaining ring. The area between the O-ring and the back-to-back double retaining ring is connected to the oil inlet and oil outlet of the valve body, respectively.

[0012] The spring includes spring I and spring II, with spring I sleeved over spring II, and the directions of rotation of spring I and spring II are opposite.

[0013] Spring I has a right-handed structure, and spring II has a left-handed structure.

[0014] The valve cover and valve core are respectively provided with grooves for placing spring I and spring II. The depth of the groove for placing spring II is greater than the depth of the groove for placing spring I. There is a gap of 0.5mm between the groove and the spring.

[0015] The valve core end face of the one-way valve is a 45° conical surface, which mates with the 90° right-angle sealing surface of the valve core.

[0016] The plunger sleeve is connected to the inside of the valve body by threads. The end face of the plunger sleeve has four through holes for installing and removing the plunger sleeve, valve body and valve core.

[0017] The diameter of the damping hole in the middle part of the damping plug is Φ0.6mm.

[0018] The present invention has the following advantages: (1) Extreme space optimization and high power density: Multiple valve bodies are placed inside the piston rod lugs of the telescopic hydraulic cylinder, eliminating the traditional external pipelines and valve frames, saving valuable space, reducing structural weight, achieving lightweighting, improving the road driving performance and operational stability of the whole machine, realizing the miniaturization, lightweighting and high power density of the hydraulic control system, and meeting the stringent requirements of all-terrain wheeled cranes for space and weight.

[0019] (2) Improved oil flow and control stability: The valve-controlled pressure series arrangement can simultaneously control the valve opening. The oil inlet circuit also adopts a series circuit to achieve synchronous pressure control. Combined with the two-stage step structure design of the valve body, the oil flow is effectively increased, ensuring the stability of the hydraulic system flow. The parallel and coordinated operation of multiple valves can more accurately match load changes, reduce speed fluctuations, prevent hydraulic shock, improve low-speed stability, avoid load jitter faults, significantly improve the smoothness of operation and micro-motion performance, and adapt to the needs of complex hoisting operations.

[0020] (3) Super reliability and fault redundancy: The multi-valve parallel structure design ensures that even if one valve fails in a harsh construction environment, the remaining valves can still maintain system stability, support the completion of critical operations or safe recovery of the boom, greatly improving the uptime and operational safety of all-terrain cranes in situations far from maintenance bases; at the same time, the combination of drilling straight holes and inclined holes eliminates the welding of process holes on the end face, completely eliminating the risk of oil leakage caused by welding defects of process holes, reducing the number of welds and oil leakage points, and improving the reliability of the oil circuit.

[0021] (4) Lightweighting and cost optimization: The internal multi-angle inclined hole through technology is adopted to eliminate the straight oil passage, reduce the space structure of the cylinder head (ear ring), and at the same time reduce the number of process hole plugs, so that the structural parts can meet the lightweight requirements, reduce the processing steps, and reduce the manufacturing cost.

[0022] (5) Maintainability: The structure is simple, easy to install and maintain; the valve body specifications are uniform and can be driven synchronously, which reduces the complexity of the system and the difficulty of fault diagnosis, and meets the requirements of high maintenance convenience for all-terrain cranes. Attached Figure Description

[0023] The accompanying drawings, as part of this invention, are provided to further illustrate the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation thereof. Clearly, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0024] In the attached diagram: Figure 1 This is a schematic diagram of the internal structure of the present invention; Figure 2 This is a top view of the present invention; Figure 3 This invention follows Figure 1 Cross-sectional view along the EE direction; Figure 4 This is a schematic diagram of the control valve of the present invention; Figure 5 This is a schematic diagram showing the direction of oil flow in the control valve when the piston rod extends according to the present invention; Figure 6 This is a schematic diagram showing the direction of oil flow in the control valve when the piston rod retracts according to the present invention.

[0025] In the diagram: 1. Core tube I, 2. Core tube II, 3. Core tube III, 4. Cylinder, 5. Piston rod, 6. Guide sleeve, 7. Earring, 8. End cap I, 9. Plug, 10. Plunger, 11. Plunger sleeve, 12. Valve body, 13. One-way valve spring, 14. One-way valve, 15. Valve core, 16. Spring I, 17. Spring II, 18. Valve cover, 19. End cap II, 20. Screw.

[0026] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] like Figures 1 to 4 The diagram shows a multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery, comprising a cylinder 4, a piston, a piston rod 5, a guide sleeve 6, and an ear ring 7. Multiple valve holes are arranged in parallel within the ear ring 7. End caps I 8 and II 19 are respectively provided at both ends of each valve hole. A control valve is provided within each valve hole, positioned near the end cap II 19. The sealed cavity between the control valve and the end cap I 8 serves as the control chamber of the control valve. The piston rod 5 contains core tubes I 1, II 2, and III 3. The oil outlets of the multiple control valves are connected and then connected to the rodless chamber of the hydraulic cylinder via core tube III 3. The control chambers of the multiple control valves are connected and then connected to the rod chamber of the hydraulic cylinder via core tube I 1. Core tube III 3 connects to the cylinder arm pin chamber. This invention features six valve holes within the earring. These valve holes connect to external hydraulic lines on one side and to the rod-side and rodless-side chambers of the hydraulic cylinder via core tubes on the other. A control valve is installed within each valve hole, with its outlet connected to the rodless-side chamber and its controller connected to the rod-side chamber. The pressure in the rod-side chamber controls the opening and closing of the control valve, effectively controlling the hydraulic oil flow in the rodless-side chamber of the hydraulic cylinder. This, in turn, regulates the extension and retraction speeds of the hydraulic cylinder, improving the smoothness of the telescopic device's operation. To increase the oil flow rate, an internal valve control port is used. The six control valves are arranged in series, with their inlets, outlets, and control chamber oil circuits connected to each other. This allows for simultaneous control of the hydraulic oil flow within the hydraulic cylinders, achieving synchronous control of the multi-valve oil circuits. Furthermore, the internal lugs utilize multi-hole oblique holes to connect the oil circuits, eliminating the need for welding process holes on the end face. By employing a combination of straight and oblique holes, the design minimizes or eliminates the need for drilling process holes, completely preventing oil leakage caused by welding defects in process holes. This design also reduces the weight of the structural components, lowers costs, and reduces the number of processing steps. The structure is easy to disassemble, install, and maintain.

[0031] like Figures 1 to 4The diagram illustrates a multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery. The control valves include a valve body 12, a valve core 15, a one-way valve 14, a valve cover 18, a plunger 10, and a plunger sleeve 11. The valve cover 18 is located at one end of the valve body 12 near the end cap II 19, and a spring is provided between the valve cover 18 and the valve core 15. The plunger sleeve 11 is located at the other end of the valve body 12, and a plunger 10 is provided between the plunger sleeve 11 and the valve core 15. The one-way valve 14... A one-way valve 14 is positioned at one end of the valve core 15, with one end abutting against the inner wall of the valve core 15. The one-way valve spring 13 of the one-way valve 14 abuts against the plunger 10. One end of the plunger 10 is connected to the plunger sleeve 11, and the other end of the plunger 10 is connected to the valve core 15. A radial through-hole is provided at the connection point between the two ends of the plunger 10. A damping plug is provided at the connection end between the plunger 10 and the valve core 15. The damping hole of the damping plug communicates with the radial through-hole and the internal space of the one-way valve 14. The diameter of the damping hole in the middle of the damping plug is Φ0.6mm. The control valve of this invention includes a valve body, a valve core, a check valve, and a plunger. The check valve is located at one end of the valve core, and a check valve spring is installed inside the check valve core. The plunger is located on the side near the check valve spring, and the plunger seals and positions the check valve. The end face of the check valve core is a 45° conical surface, which, under the action of the check valve spring, connects and cooperates with the 90° right-angle sealing surface of the valve core to achieve a seal. The plunger is coaxially and concentrically arranged with the check valve core and is fixed to the inner side of the valve core by a threaded connection. A damping plug is installed at the end of the plunger near the check valve, and the damping plug has a damping hole in the middle, that is, the damping cavity in the middle of the plunger is the same as the inner cavity of the check valve core. The size of the damping hole is Φ0.6mm in diameter. Two radial oil holes are provided in the circumferential direction in the middle part of the plunger, and a grid is provided on the outer circle of the other end of the plunger. The plunger sleeve, coaxially fitted with the inner bore of the plunger sleeve, has a T-shaped structure with a protruding step that connects to the inner thread of the left end of the valve body. The left end of the plunger is the control chamber of the telescopic hydraulic cylinder, which communicates with the rod chamber of the telescopic hydraulic cylinder. When the valve core moves under the pressure of the control chamber, the damping hole in the middle of the damping plug reduces the pressure impact of the control chamber, preventing the displacement of the plunger and valve core to the right from being too large. This allows for controllable displacement of the valve body, thereby controlling the outflow of oil from the rodless chamber when the telescopic hydraulic cylinder retracts. This prevents the piston of the telescopic hydraulic cylinder from falling at high speed due to its own weight and the excessively fast outflow of oil from the rodless chamber. In other words, it controls the retraction speed of the telescopic hydraulic cylinder, preventing the crane boom from suddenly falling due to its rapid retraction speed, which could lead to safety malfunctions.

[0032] like Figures 1 to 4The diagram shows a multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery. The valve body 12 has several valve body oil inlet holes at one end near the valve cover 18, and several valve body oil outlet holes at the other end near the plunger sleeve 11. The valve body oil inlet holes and valve body oil outlet holes are isolated from each other. Each valve hole has an oil passage that cooperates with the valve body oil inlet holes and valve body oil outlet holes, and the oil passages between adjacent valve holes are connected together. The valve core 15 has a valve core oil inlet hole and a valve core oil outlet hole that communicate with the valve body oil inlet holes and valve body oil outlet holes. The valve core oil inlet holes and valve core oil outlet holes are connected in the valve core 15, and the connection and closure between the valve core oil inlet holes and valve core oil outlet holes are controlled by a one-way valve 14. The valve core of this invention has a hollow internal structure, and a one-way valve moves within the valve core to control the opening and closing of the valve core's oil outlet. The outer surface of the valve core has four cylindrical structures of different sizes along the axial direction, with three grooves between adjacent cylindrical structures. The first outer circle of the valve core is coaxially connected to the valve cover and is equipped with a Gladley ring for axial sealing. The diameter of the second outer cylinder of the valve core is larger than that of the first outer cylinder and the diameter at the step of the first inner hole of the valve body. The left end of the second outer cylinder has a 45° conical structure, which mates with the 90° right-angle structure of the first inner hole of the valve body, providing a seal between the valve body and the valve core. The right-angled base of the valve body undergoes a quenching process, resulting in high hardness and strong pressure resistance. The third and fourth outer cylinders both mate with the inner wall of the valve body for regional sealing. The groove between the first and second outer circles of the valve core has four oil inlets along its circumferential direction, corresponding to the oil inlet of the valve body. The groove between the third and fourth outer circles of the valve core has four oil outlets, corresponding to the oil outlet of the valve body. A check valve is located at the oil outlet of the valve core. In the initial state, the check valve core is pressed against the 90° right-angle sealing surface of the valve core by a one-way spring and hydraulic pressure. When oil enters the oil inlet of the valve core, the check valve is pushed open, and the oil inlet and outlet of the valve core are connected to supply oil to the rodless chamber of the telescopic cylinder. Therefore, the opening and closing of the check valve can determine the connection and disconnection of the oil inlet and outlet of the valve core, realizing the control function of the control valve.

[0033] like Figures 1 to 2 The invention discloses a multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery. The lug 7 is used to connect to the main boom. The middle part of the lug 7 has a square structure, with four planes on the left, right, top, and bottom. The lug 7 is welded to the rod body. In this invention, the lug is located at the right end of the piston rod. One end has a single-ear structure with a pin hole for connection to the main boom. The middle part has a square structure with four planes on the left, right, top, and bottom. The other end is welded with a core tube leading to the large cavity, small cavity, and cylinder boom pin cavity, and is welded to the rod body.

[0034] like Figures 1 to 3The invention discloses a multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery. End caps I8 and II19 are connected to the end face of an ear ring 7 via screws 20. O-rings and retaining rings are provided at the connection points between end caps I8 and II19 and the ear ring 7. The end caps of this invention are located on the end face of the ear ring and connected to it by four screws. One end of the end cap is threadedly connected to the valve body. A sealing structure is provided at the mating surface between the valve cap and the ear ring, including an O-ring on the end face of the end cap in contact with the ear ring and an O-ring and retaining ring arranged at the radial threaded step of the end cap to prevent hydraulic oil leakage.

[0035] like Figures 3 to 4 The invention discloses a multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery. The valve body 12 has three seals between it and the valve port: an O-ring and a back-to-back double retaining ring. The O-ring is positioned in the middle of the back-to-back double retaining rings. The area between the O-ring and the back-to-back double retaining rings communicates with the valve body's oil inlet and outlet ports, respectively. The outer circumference of the valve body is annular cylindrical with three radial sealing grooves. It employs an O-ring + back-to-back double retaining ring structure (the O-ring is in the middle, and the double retaining rings are arranged on both sides of the O-ring). The outer circumference has two oil passages: one near the valve cover is the valve body inlet, and the other is the outlet to the rodless chamber of the hydraulic cylinder. These two oil passages are arranged at a secondary step on the outer circumference, the diameter of which is smaller than the outer circumference of the valve body to increase the hydraulic oil flow. Sealing rings are provided on both sides of the two oil passages to prevent internal leakage in the hydraulic cylinder due to the connection of the two oil passages, thereby preventing the hydraulic cylinder from falling during boom lifting operations.

[0036] like Figures 3 to 4The diagram illustrates a multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery. The springs include spring I16 and spring II17, with spring I16 fitted over spring II17. The rotation directions of springs I16 and II17 are opposite. Spring I16 is right-handed, and spring II17 is left-handed. The valve cover 18 and valve core 15 are respectively provided with grooves for placing spring I16 within spring II17. The depth of the groove for spring II17 is greater than the depth of the groove for spring I16, and a 0.5mm gap exists between the groove and the spring. The valve cover of this invention has a blind hole structure on the inside, with a large and a small double spring inside. The large spring is right-handed, and the small spring is left-handed. The bidirectional rotation of the springs prevents them from interfering with each other when they move back and forth with the valve core. At the same time, it increases the spring's reset force, preventing the valve core from slowing down or jamming due to insufficient force of a single spring, thus improving the smoothness of valve core operation. The valve core is coaxially connected to the inside of the valve cover. The lower end of the valve core has a hole structure that mates with the large and small springs. The hole depth at the small spring mating point is greater than the hole depth at the large spring mating point. The different sized holes serve as guides when the springs are compressed and ejected. There is a 0.5mm gap between the spring mounting hole on the valve core and the corresponding outer circle of the spring, and there is also a 0.5mm gap between the spring mounting hole on the end cover and the corresponding outer circle of the spring. This ensures the concentricity of the springs during up and down movement, increases the spring force, and prevents the springs from contacting the metal substrate of the valve body and the inner hole of the end cover after being compressed and bent.

[0037] like Figures 3 to 4 The diagram shows a multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery. The valve core end face of the one-way valve 14 is a 45° conical surface, which cooperates with the 90° right-angle sealing surface of the valve core 15.

[0038] like Figures 3 to 4 The diagram shows a multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery. The plunger sleeve 11 is connected to the inner side of the valve body 12 by threads. The end face of the plunger sleeve 11 has four through holes for installing and removing the plunger sleeve 11, valve body 12 and valve core 15.

[0039] like Figure 5 and Figure 6 As shown, the control method of the present invention is as follows: Extension control: Hydraulic oil passes through the oil port of ear ring 7, the oil passage hole of the first groove of valve body 12, and the oil passage hole of the first groove of valve core 15 to reach the one-way valve core. It overcomes the elastic force of the one-way valve spring 13 and pushes open the one-way valve core. It then passes through the third groove of valve core 15, the second groove of valve body 12, and the rodless cavity core tube on the piston rod side in sequence, and enters the rodless cavity of the large chamber of the hydraulic cylinder, driving the piston rod to extend.

[0040] Retraction Control: In the initial retraction state of the telescopic hydraulic cylinder, the one-way valve core is pressed against the 90° right-angle sealing surface of the valve core under the combined action of the spring force of the one-way valve 13 and the oil pressure, cutting off the fluid flow. When the pressure in the rod chamber of the telescopic hydraulic cylinder reaches the set value, the pressure is transmitted to the valve body control chamber between the valve body and the end cover through the lug control oil circuit, pushing the plunger to the right. Under the buffering action of the damping plug's damping orifice, the plunger's rightward speed is controllable, thereby driving the valve core connected to the plunger to move to the right. At this time, the valve body is stationary, and the 45° conical surface of the valve core is perpendicular to the 90° right angle of the valve body. When the sealing surfaces separate, the valve core moves 5.5mm-8mm to the right under the action of the spring force. At this time, the two convex shoulders in the middle of the valve core are in the inner cavity of the concave inner groove of the valve body. The seals between the oil outlet and the oil inlet of the valve body are opened, and the oil can flow between the oil outlet and the oil inlet of the valve body. At this time, the hydraulic oil in the rodless chamber of the hydraulic cylinder flows to the lug oil port through the gap between the opened valve core and the valve body. The amount of oil flowing out of the rodless chamber of the hydraulic cylinder realizes the smooth retraction of the telescopic hydraulic cylinder and avoids the telescopic device from falling at high speed due to load, self-weight and excessive oil flow speed in the rodless chamber.

[0041] This invention discloses a multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery. Through innovative designs such as multi-valve parallel built-in inserts, series oil port arrangement, and oblique hole through-oil circuit, it effectively solves the problems of large space occupation, high oil leakage risk, and poor operation stability caused by external valve groups in the prior art. The telescopic device for ultra-large wheeled cranes enables rapid and stable extension and retraction, precise load control, and improves system reliability, lightweight level, and maintenance convenience, meeting the usage requirements of all-terrain wheeled cranes under complex working conditions, frequent site transfers, and high mobility requirements.

[0042] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0043] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this invention and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery, characterized in that: The cylinder includes a cylinder (4), a piston, a piston rod (5), a guide sleeve (6), and an ear ring (7). Multiple valve holes are connected in parallel inside the ear ring (7). End caps I (8) and II (19) are respectively provided at both ends of the valve holes. Each valve hole is provided with a control valve. The control valve is located on the side close to the end cap II (19). The sealed cavity between the control valve and the end cap I (8) is the control cavity of the control valve. The piston rod (5) is provided with a core tube I (1), a core tube II (2), and a core tube III (3). After the oil outlets of the multiple control valves are connected, they are connected to the rodless cavity of the hydraulic cylinder through the core tube III (3). After the control cavities of the multiple control valves are connected, they are connected to the rod cavity of the hydraulic cylinder through the core tube I (1). The core tube III (3) is connected to the cylinder arm pin cavity. The control valve includes a valve body (12), a valve core (15), a check valve (14), a valve cover (18), a plunger (10), and a plunger sleeve (11). The valve cover (18) is located at one end of the valve body (12) near the end cap II (19). A spring is provided between the valve cover (18) and the valve core (15). The plunger sleeve (11) is located at the other end of the valve body (12). A plunger (10) is provided between the plunger sleeve (11) and the valve core (15). The check valve (14) is located on the valve core (15). At one end, one end of the one-way valve (14) abuts against the inner wall of the valve core (15), and the one-way valve spring (13) of the one-way valve (14) abuts against the plunger (10); one end of the plunger (10) is connected to the plunger sleeve (11), and the other end of the plunger (10) is connected to the valve core (15). The connection between the two ends of the plunger (10) is provided with a radial through hole, and the connection end between the plunger (10) and the valve core (15) is provided with a damping plug. The damping hole of the damping plug is connected to the radial through hole and the internal space of the one-way valve (14). The valve body (12) has several valve body oil inlet holes at one end near the valve cover (18), and several valve body oil outlet holes at the other end near the plunger sleeve (11). The valve body oil inlet holes and valve body oil outlet holes are isolated from each other. The valve holes are provided with oil passages that cooperate with the valve body oil inlet holes and valve body oil outlet holes. The oil passages between adjacent valve holes are connected together. The valve core (15) is provided with valve core oil inlet holes and valve core oil outlet holes that communicate with the valve body oil inlet holes and valve body oil outlet holes. The valve core oil inlet holes and valve core oil outlet holes are connected in the valve core (15), and the connection and closure between the valve core oil inlet holes and valve core oil outlet holes are controlled by a one-way valve (14).

2. The multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery as described in claim 1, characterized in that: The earring (7) is used to connect with the main arm. The middle part of the earring (7) is square, and the left, right, top and bottom are four planes. The earring (7) is welded to the rod.

3. The multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery as described in claim 1, characterized in that: The end cap I (8) and end cap II (19) are connected to the end face of the earring (7) by screws (20). The connection between the end cap I (8) and end cap II (19) and the earring (7) is provided with an O-ring and a retaining ring.

4. The multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery as described in claim 1, characterized in that: The valve body (12) is provided with three seals between itself and the valve hole, namely an O-ring and a back-to-back double retaining ring. The O-ring is located in the middle of the back-to-back double retaining ring. The area between the O-ring and the back-to-back double retaining ring is connected to the valve body oil inlet and the valve body oil outlet, respectively.

5. The multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery as described in claim 1, characterized in that: The spring includes spring I (16) and spring II (17), with spring I (16) sleeved over spring II (17), and spring I (16) and spring II (17) having opposite directions of rotation.

6. The multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery as described in claim 5, characterized in that: Spring I (16) is a right-handed structure, and spring II (17) is a left-handed structure.

7. The multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery as described in claim 5, characterized in that: The valve cover (18) and valve core (15) are respectively provided with grooves for placing spring I (16) on spring II (17). The depth of the groove for placing spring II (17) is greater than the depth of the groove for placing spring I (16). There is a gap of 0.5mm between the groove and the spring.

8. The multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery as described in claim 1, characterized in that: The valve core end face of the one-way valve (14) is a 45° conical surface, which matches the 90° right-angle sealing surface of the valve core (15).

9. The multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery as described in claim 1, characterized in that: The plunger sleeve (11) is connected to the inner side of the valve body (12) by threads. The end face of the plunger sleeve (11) has 4 through holes for installing and removing the plunger sleeve (11), valve body (12) and valve core (15).

10. The multi-valve parallel synchronous control telescopic device for ultra-large lifting machinery as described in claim 1, characterized in that: The diameter of the damping hole in the middle part of the damping plug is Φ0.6mm.

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