Rigid linear volume-compensated oil transfer device

Abstract

The utility model relates to a kind of rigid straight line volume compensation formula oil conveying device, including oil conveying cylinder, oil conveying cylinder is also equipped with oil conveying piston rod, the inside of oil conveying cylinder and oil conveying piston rod is hollow design, the inside between oil conveying piston rod and the inside of oil conveying cylinder is always in communication state, oil conveying piston rod can slide relative to oil conveying cylinder, the oil inlet of oil conveying cylinder is connected in the fixed oil line interface of outside, the oil outlet of oil conveying piston rod is connected in the oil line interface of movable oil cylinder of outside, the inside of oil conveying piston rod one end relative to the inside of oil conveying cylinder always located in the inside of oil conveying cylinder and the other end of oil conveying piston rod always connected in the oil line interface of oil cylinder;The utility model replaces traditional flexible hose to oil supply for motion executor, solves three big problems of existing technology that hose is easy to wear, afraid of extrusion, system rigidity is poor, realizes the unity of high reliability, high security and high control accuracy.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, specifically to a rigid linear volumetric compensation oil delivery device. Background Technology

[0002] Currently, the common method for supplying oil to hydraulic actuators and hydraulic cylinders that drive the platform's height changes on telescopic platforms is through hydraulic hoses. However, this supply method has revealed significant drawbacks in actual operation. Because the platform needs to continuously reciprocate or extend, or lift and lower, the connected hydraulic hoses are forced to bend and twist frequently, easily coming into contact with and rubbing against adjacent mechanical structures. This continuous mechanical interference leads to wear on the hose surface, fatigue of the internal cord layers, and even localized stress concentration. Over time, the hose's material properties degrade rapidly, its pressure resistance and sealing integrity decrease, ultimately significantly shortening the service life of the hose assembly.

[0003] Authorization notice number CN120348620B discloses an ultra-long and ultra-heavy steel coil automated warehouse system and its usage method. According to its instruction manual and drawings, the system has a hydraulic lifting structure installed on the mother car traveling mechanism, and the mother car platform is installed on the hydraulic lifting structure. The height of the hydraulic lifting structure is changed so that the height of the mother car platform changes.

[0004] However, the hydraulic lifting structure in this solution typically relies on hydraulic hoses for oil supply, which has certain limitations: 1. During the reciprocating motion of the cylinder, the hose is prone to friction with surrounding components, excessive bending, or twisting, thereby accelerating its fatigue and wear, and shortening its service life; 2. When the height of the hydraulic lifting structure changes, it is difficult to control the retraction path of the hose, which is very easy to get caught in the gaps of moving parts, leading to squeezing, cutting, or even bursting, causing hydraulic oil leakage failure; 3. For other servo systems that require high-precision control, the hose, due to its inherent elasticity, will expand when the pressure changes, generating additional volumetric effects, thereby reducing the system's rigidity, response speed, and control accuracy. Summary of the Invention

[0005] This invention addresses the aforementioned shortcomings of hose-based oil supply systems by proposing a rigid linear volumetric compensation oil supply device. This device replaces traditional flexible hoses for supplying oil to motion actuators, solving three major problems in existing technologies: hose wear, susceptibility to compression, and poor system rigidity. It achieves a balance between high reliability, high safety, and high control precision.

[0006] The objective of this invention is achieved through the following technical solution: a rigid linear volumetric compensation oil delivery device, comprising an oil delivery cylinder, wherein an oil delivery piston rod is also provided inside the oil delivery cylinder. Both the oil delivery cylinder and the oil delivery piston rod are hollow, and the interior of the oil delivery piston rod is always in communication with the interior of the oil delivery cylinder. The oil delivery piston rod can slide relative to the oil delivery cylinder. The oil inlet of the oil delivery cylinder is connected to an external fixed oil passage interface, and the oil outlet of the oil delivery piston rod is connected to an external movable oil passage interface. When one end of the oil delivery piston rod slides relative to the interior of the oil delivery cylinder, it is always located inside the oil delivery cylinder, and the other end of the oil delivery piston rod is always connected to the oil passage interface of the oil cylinder.

[0007] Preferably, both ends of the oil cylinder are provided with cylinder limiting grooves and first threaded locking grooves. The first threaded locking grooves at both ends of the oil cylinder are respectively threadedly connected to the oil cylinder seat and the oil cylinder cover. The ends of the oil cylinder seat and the oil cylinder cover abut against the inside of the cylinder limiting groove. The inside of the oil cylinder seat is provided with an oil delivery channel, and the inside of the oil cylinder cover is provided with an inner groove that allows the oil delivery piston rod to slide through. This design ensures that the cylinder limit groove can quickly and accurately position the oil cylinder seat and oil cylinder cover to the designed position during installation, while the first threaded locking groove provides a strong locking force to ensure that the connection will not loosen under oil pressure, and the seal is reliable.

[0008] Preferably, one end of the oil cylinder seat extends into the oil cylinder barrel, and the surface of the end of the oil cylinder seat near the inside of the oil cylinder barrel is also provided with a first annular groove. The surface of the first annular groove is provided with a first O-ring seal and a first annular seal. The outer surfaces of the first O-ring seal and the first annular seal are deformed by the pressure of the inner wall of the oil cylinder barrel. This setup achieves an extremely reliable static seal between the oil cylinder seat and the oil cylinder barrel, effectively preventing high-pressure oil from leaking from the cylinder barrel inlet.

[0009] Preferably, the end of the oil cylinder seat away from the oil cylinder barrel is provided with a second threaded locking groove. The internal thread of the second threaded locking groove is connected to one end of the right-angle connector. The outer surface of the right-angle connector is also threaded with a locking nut. A metal washer is provided between the locking nut and the oil cylinder seat. The inside of the right-angle connector is hollow and the right-angle connector is connected to the oil cylinder barrel. The other end of the right-angle connector is connected to an external, fixed oil circuit interface.

[0010] Preferably, the oil cylinder cover extends into the oil cylinder barrel, and the surface of the oil cylinder cover near the inside of the oil cylinder barrel is also provided with a second annular groove. The surface of the second annular groove is provided with a second O-ring seal and a second annular seal. The outer surfaces of the second O-ring seal and the second annular seal are deformed by the pressure of the inner wall of the oil cylinder barrel. This setup ensures that the static seal at the other end of the oil delivery cylinder (the piston rod extension end) is equally foolproof, forming a closed pressure vessel together with the inlet end.

[0011] Preferably, the inside of the oil cylinder head is further provided with several third annular grooves, fourth annular grooves and fifth annular grooves of different widths. Each third annular groove is provided with a third annular sealing ring for guidance. The fifth annular groove is provided with a dustproof ring made of nitrile rubber. The third annular sealing ring is made of polytetrafluoroethylene. Each fourth annular groove is provided with a step seal ring. The step seal ring is composed of a stepped part of polytetrafluoroethylene and an O-shaped part of nitrile rubber. The inner walls of the third annular sealing ring, the step seal ring and the dustproof ring are deformed by the pressure of the outer wall of the oil piston rod. This setup constitutes a fully functional, multi-layered dynamic sealing system, achieving low friction, zero leakage, and long service life, and is the core of ensuring reliable operation of the device. Preferably, one end of the oil delivery piston rod is externally sleeved with a piston body, the piston body is provided with a sixth annular groove, and the interior of the sixth annular groove is provided with a fourth annular sealing ring for guidance. The fourth annular sealing ring is made of polytetrafluoroethylene. The other end of the oil delivery piston rod passes through the interior of the cylinder head groove, the third annular sealing ring, the step seal ring and the dustproof ring to the outside. The outer surface of the fourth annular sealing ring is deformed by the pressure of the inner wall of the oil delivery cylinder.

[0012] Preferably, an oil nozzle adapter is fitted onto the end of the oil delivery piston rod near the outside. The oil nozzle adapter has an internal oil passage that communicates with the interior of the oil delivery piston rod. A third O-ring seal is provided between the oil nozzle adapter and the end of the oil delivery piston rod. The oil delivery piston rod also has a piston rod through hole inside. The axis of the piston rod through hole is perpendicular to the axis of the oil delivery piston rod and is used to balance the pressure on both sides of the piston body inside the oil delivery cylinder.

[0013] 1. This device completely replaces flexible hoses with a rigid oil delivery channel formed by the oil delivery cylinder, oil delivery piston rod, and their internal connecting chambers. Traditional hoses have uncontrollable paths when retracted and are easily caught in gaps between moving parts. As a rigid structure, the oil in this device flows within a closed, rigid component. There is only axial sliding between the oil delivery piston rod and the oil delivery cylinder, avoiding the complex spatial deformation of hoses. This fundamentally eliminates wear and fatigue caused by bending and friction, completely avoids the risks of hose compression, cutting, and bursting, greatly improves the safety and reliability of the system, and eliminates the potential for malfunctions and safety accidents caused by oil leakage. 2. Traditional hoses exhibit a volumetric effect due to their elasticity under pressure changes, leading to decreased system rigidity, response delay, and deterioration in control accuracy. In this design, both the oil delivery cylinder and piston rod are rigid bodies with minimal deformation under pressure, significantly reducing the elastic volume of the oil delivery path. This results in higher overall rigidity of the hydraulic system, more rapid and direct pressure build-up and transmission, thus significantly improving dynamic response speed and control accuracy, making it particularly suitable for high-precision servo control systems. 3. The sliding of the oil delivery piston rod within the oil delivery cylinder causes the volumes of the two chambers separated by the piston body to increase and decrease respectively. Pressure balance between the two chambers is achieved through the piston rod's through-hole, ensuring that the oil can circulate freely and dynamically within the device with low resistance, compensating for changes in the required oil passage length caused by the movement of the external actuator. This is an innovative concept of "rigid body, flexible connection," meaning the external structure is rigid, but the internal oil passages achieve a "telescopic" function through volume exchange. 4. Because this solution integrates dynamic oil delivery and volume compensation into a compact rigid unit, replacing the hose layout that requires a lot of space for bending and swinging, the mechanical structure design of the entire telescopic motion platform is more compact and reasonable, effectively saving valuable installation space and providing advantages for the miniaturization and integration design of the equipment. Attached Figure Description

[0014] Figure 1 This is a perspective view of the present utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a cross-sectional view of the present invention after the sealing element has been removed; Figure 4 This is an exploded cross-sectional view of the present invention; Figure 5 For the present utility model in Figure 2 Enlarged view of region A in the image; Figure 6 For the present utility model in Figure 3 Enlarged view of region B in the image; Figure 7 For the present utility model in Figure 4 Enlarged view of region C in the image; Figure 8 For the present utility model in Figure 2 Enlarged view of region D in the image; Figure 9 For the present utility model in Figure 3 Enlarged view of region E in the image; Figure 10 For the present utility model in Figure 4 A magnified view of region F in the image.

[0015] The markings in the diagram are as follows: 1. Oil cylinder barrel; 11. Cylinder barrel limiting groove; 12. First threaded locking groove; 2. Oil piston rod; 21. Piston rod through hole; 3. Oil cylinder seat; 31. First annular groove; 32. First O-ring seal; 33. First annular seal; 34. Second threaded locking groove; 4. Oil cylinder cover; 41. Second annular groove; 42. Second O-ring seal; 43. Second annular seal; 44. Third annular groove; 45. Fourth annular groove; 46. Fifth annular groove; 47. Third annular seal; 48. Step seal; 49. Dustproof ring; 40. Cylinder head inner groove; 5. Right angle connector; 51. Locking nut; 52. Metal gasket; 6. Piston body; 61. Sixth annular groove; 62. Fourth annular seal; 7. Oil nozzle adapter; 71. Third O-ring seal. Detailed Implementation

[0016] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings: like Figure 1 , Figure 2 , Figure 5 and Figure 8 As shown, a rigid linear volumetric compensation oil conveying device includes an oil conveying cylinder 1, and an oil conveying piston rod 2 is also provided inside the oil conveying cylinder 1. Both the oil conveying cylinder 1 and the oil conveying piston rod 2 are hollow. The interior of the oil conveying piston rod 2 is always in communication with the interior of the oil conveying cylinder 1. The oil outlet of the oil conveying piston rod 2 is connected to the oil circuit interface of an externally movable oil cylinder. When one end of the oil conveying piston rod 2 slides relative to the interior of the oil conveying cylinder 1, it is always located inside the oil conveying cylinder 1, and the other end of the oil conveying piston rod 2 is always connected to the oil circuit interface of the oil cylinder. The oil conveying piston rod 2 can slide relative to the oil conveying cylinder 1. It should be noted that in the whole scheme, the interior of the oil cylinder 1 is divided into two parts by the oil piston rod 2. The interior of the oil cylinder 1 and the oil piston rod 2 are always directly connected through the hollow design and nested installation. During implementation, when the external hydraulic cylinder is installed on a telescopic platform (a telescopic platform is a conventional technology in this field, and its working principle and structure will not be described in detail here); the end of the oil piston rod 2 near the oil outlet is connected to the oil inlet of the hydraulic actuator that performs the telescopic movement, while the oil inlet of the oil cylinder 1 is connected to the oil circuit interface on the external fixed base, and the hydraulic oil pipe for oil supply is directly connected to the oil inlet of the oil cylinder 1; When the telescopic platform extends or retracts, the oil delivery piston rod 2 inside the oil delivery cylinder 1 also moves synchronously with the telescopic platform. The volume of the cavity inside the oil delivery cylinder 1 increases on one side and decreases on the other. The oil passage connecting the inside of the oil delivery cylinder 1 and the oil delivery piston rod 2 flows freely between the two, thereby dynamically compensating for the change in oil passage length caused by the movement of the actuator on the telescopic platform.

[0017] Similarly, the end of the oil cylinder 1 is hinged to the lifting support frame in the lifting platform, and the oil outlet of the oil piston rod 2 is hinged to the oil inlet of the external oil cylinder; the piston rod and cylinder body of the external oil cylinder are also hinged to the lifting platform and the lifting support frame respectively. The change in the length of the piston rod of the oil cylinder is used to drive the change in the height of the lifting plate. During this process, the position of the entire oil cylinder will also change (the lifting mechanism with lifting function is conventional technology in this field, and its working principle and structure will not be described in detail here). The change in the position of the hydraulic cylinder indicates a change in the oil inlet of the hydraulic cylinder; the oil delivery piston rod 2 inside the oil delivery cylinder 1 will also move synchronously with the oil inlet of the hydraulic cylinder; similarly, the volume of the cavity inside the oil delivery cylinder 1 increases on one side and decreases on the other, and the oil passage connecting the inside of the oil delivery cylinder 1 and the oil delivery piston rod 2 flows freely between the two, thereby dynamically compensating for the change in oil passage length caused by the movement of the hydraulic cylinder.

[0018] Please continue to refer to this. Figure 5 and Figure 6 The structure of how the oil delivery piston rod 2 is slidably connected to the inside of the piston body 6 is further explained; the piston body 6 is sleeved on one end of the oil delivery piston rod 2, and the piston body 6 is provided with a sixth annular groove 61. A fourth annular sealing ring 62 for guidance is provided inside the sixth annular groove 61. The material of the fourth annular sealing ring 62 is polytetrafluoroethylene. like Figure 5As shown, during the sliding process of the oil delivery piston rod 2 relative to the inside of the piston body 6, the outer surface of the fourth annular seal ring 62 will be deformed by the pressure of the inner wall of the oil delivery cylinder 1. The deformation of the fourth annular seal ring 62 fills the gap between the inner wall of the oil delivery cylinder 1 and the fourth annular seal ring 62. This prevents the oil in the oil delivery cylinder 1 located above the piston body 6 from flowing into the area below the piston body 6 inside the oil delivery cylinder 1 through the outer wall of the piston body 6. The fourth annular seal ring 62 of the piston body 6 divides the cavity inside the oil delivery cylinder 1 into upper and lower parts, and the oil can only flow to the external oil cylinder through the hollow flow channel inside the oil delivery piston rod 2.

[0019] In this embodiment, it should be noted that the oil delivery piston rod 2 is also provided with a piston rod through hole 21 inside, and the axis of the piston rod through hole 21 is perpendicular to the axis of the oil delivery piston rod 2. Although the fourth annular seal 62 of the piston body 6 divides the cavity inside the oil cylinder 1 into upper and lower parts, the piston body 6 will also slide when the oil piston rod 2 slides relative to the oil cylinder 1. Therefore, if the piston rod through hole 21 is not opened inside the oil piston rod 2 during the sliding, the pressure in the upper and lower parts of the cavity inside the oil cylinder 1 will be different. This pressure difference will hinder the piston body 6, and the piston body 6 will transmit the force of this resistance to the oil piston rod 2, making it difficult for the oil piston rod 2 to slide relative to the inside of the oil cylinder 1. Therefore, when the oil delivery piston rod 2 slides relative to the inside of the oil delivery cylinder 1, the piston rod through hole 21 is used to balance the pressure of the upper and lower cavities inside the piston body 6 in the oil delivery cylinder 1, thereby ensuring that there is no pressure difference between the upper and lower sides of the piston body 6. The movement of the piston body 6 and the oil delivery piston rod 2 is only used for volume compensation rather than output force.

[0020] like Figure 2 and Figure 8 As shown, the oil outlet end of the oil delivery piston rod 2 is further connected to the external oil passage structure. An oil nozzle conversion head 7 is also sleeved on the end of the oil delivery piston rod 2 near the outside. A third O-ring seal 71 is also provided between the oil nozzle conversion head 7 and the end of the oil delivery piston rod 2. An oil passage is provided inside the oil nozzle conversion head 7 and the oil passage is connected to the inside of the oil delivery piston rod 2. The interior of the nozzle converter 7 and the oil outlet end of the oil piston rod 2 can be detachably connected by threads, and a third O-ring seal 71 is used to seal the connection at the installation position; similarly, an O-ring seal is also provided on the outer end of the nozzle converter 7 to achieve a sealed connection with the oil inlet of the oil cylinder; and the nozzle converter 7 can also be connected to the oil circuit interface of the oil cylinder using a short oil pipe.

[0021] Please refer to the reference. Figure 2 , Figure 4 , Figure 8 and Figure 9 The oil inlet of the oil cylinder 1 is connected to an external, fixed oil circuit interface. Both ends of the oil cylinder 1 are provided with cylinder limiting grooves 11 and first threaded locking grooves 12. The first threaded locking grooves 12 at both ends of the oil cylinder 1 are respectively threadedly connected to the oil cylinder seat 3 and the oil cylinder cover 4. The ends of the oil cylinder seat 3 and the oil cylinder cover 4 abut against the inside of the cylinder limiting groove 11. Since the oil cylinder 1 has two ends, the lower end of the oil cylinder 1 is in the oil outlet direction, and the inner wall of the oil cylinder 1 needs to always achieve a seal with the outer wall of the oil piston rod 2; specifically, the oil cylinder cover 4 extends into the oil cylinder 1, and the surface of the oil cylinder cover 4 near the inside of the oil cylinder 1 is also provided with a second annular groove 41, and the surface of the second annular groove 41 is provided with a second O-ring seal 42 and a second annular seal 43; After the end of the oil cylinder cover 4 near the inside of the oil cylinder barrel 1 is installed with the inside of the oil cylinder barrel 1, the outer surfaces of the second O-ring seal 42 and the second annular seal 43 are deformed by the pressure of the inner wall of the oil cylinder barrel 1. The deformation of the second O-ring seal 42 and the second annular seal 43 fills the gap between the inner wall of the oil cylinder barrel 1 and the second O-ring seal 42 and the second annular seal 43. This prevents the oil in the oil cylinder barrel 1 located above the oil cylinder cover 4 from flowing out to the outside through the outer wall of the oil cylinder cover 4. The oil can only flow to the outside oil cylinder through the hollow flow channel inside the oil piston rod 2.

[0022] Since the oil cylinder 1 always contains oil during the sliding process of the oil piston rod 2 relative to the inside of the oil cylinder 1, the outer wall of the oil piston rod 2 must always maintain a seal with the inner wall of the oil cylinder cover 4 to prevent oil from flowing out from the gap between the oil piston rod 2 and the oil cylinder cover 4. Specifically: the inside of the oil cylinder cover 4 is also provided with several third annular grooves 44, fourth annular grooves 45 and fifth annular grooves 46 of different widths. The inside of the two third annular grooves 44 is provided with third annular sealing rings 47 for guidance. The inside of the fifth annular groove 46 is provided with dustproof rings 49 made of nitrile rubber. The material of the third annular sealing rings 47 is polytetrafluoroethylene. The inside of the two fourth annular grooves 45 is provided with step seals 48. The step seals 48 are composed of a stepped part made of polytetrafluoroethylene and an O-shaped part made of nitrile rubber. The inside of the oil cylinder cover 4 is provided with an inner groove 40 that allows the oil piston rod 2 to slide through; one end of the oil piston rod 2 passes through the inner groove 40 of the cylinder cover, the third annular sealing ring 47, the step seal ring 48 and the dustproof ring 49 to the outside. Regardless of whether the outer wall of the oil delivery piston rod 2 slides directly relative to the inner wall of the oil delivery cylinder head 4, the inner walls of the third annular sealing ring 47, the step seal ring 48, and the dustproof ring 49 are always compressed by the outer wall of the oil delivery piston rod 2, thus causing deformation; the main function of the dustproof ring 49 is to remove dust from the surface of the oil delivery piston rod 2 and prevent external contaminants from entering the interior of the oil delivery cylinder head 4. Similarly, the deformation of the third annular seal 47 and the step seal 48 fills the gap between the outer wall of the oil delivery piston rod 2 and the third annular seal 47 and the step seal 48; this prevents the oil in the oil delivery cylinder 1 located above the oil delivery cylinder cover 4 from flowing out to the outside through the gap between the oil delivery cylinder cover 4 and the oil delivery piston rod 2; the oil can only flow to the outside oil cylinder through the hollow flow channel inside the oil delivery piston rod 2. Please refer to the reference. Figure 3 , Figure 4 , Figure 5 and Figure 6 Since the oil cylinder 1 has two ends, the upper end of the oil cylinder 1 is in the oil inlet direction, and the inner wall of the oil cylinder 1 needs to always achieve a seal with the outer wall of the oil cylinder seat 3; specifically, the oil cylinder seat 3 has an oil delivery channel that communicates with the inside of the oil cylinder 1; one end of the oil cylinder seat 3 extends into the inside of the oil cylinder 1, and the surface of the end of the oil cylinder seat 3 near the inside of the oil cylinder 1 is also provided with a first annular groove 31, and the surface of the first annular groove 31 is provided with a first O-ring seal 32 and a first annular seal 33; After the end of the oil cylinder seat 3 near the inside of the oil cylinder 1 is installed with the oil cylinder 1, the outer surfaces of the first O-ring seal 32 and the first annular seal 33 are deformed by the pressure of the inner wall of the oil cylinder 1. The deformation of the first O-ring seal 32 and the first annular seal 33 fills the gap between the inner wall of the oil cylinder 1 and the first O-ring seal 32 and the first annular seal 33. This prevents the oil at the top of the oil cylinder 1 from flowing out to the outside through the outer wall of the oil cylinder seat 3. The oil input from the outside can only flow into the inside of the oil cylinder 1 through the hollow flow channel inside the oil cylinder seat 3.

[0023] To facilitate the installation of the external oil pipeline and the oil cylinder seat 3, the oil cylinder seat 3 is provided with a second threaded locking groove 34 at the end away from the oil cylinder barrel 1. The internal thread of the second threaded locking groove 34 is connected to one end of the right-angle connector 5. The outer surface of the right-angle connector 5 is also threaded with a locking nut 51. A metal washer 52 is provided between the locking nut 51 and the oil cylinder seat 3. A sealing ring (not shown in the figure) is also installed at the connection position between the right-angle connector 5 and the oil cylinder seat 3. The right-angle connector 5 has a hollow interior and is connected to the oil cylinder 1. The other end of the right-angle connector 5 is connected to an external, fixed oil circuit interface. Similarly, after the right-angle connector 5 is installed with the oil cylinder seat 3, the external oil flows through the hollow channels inside the right-angle connector 5 and the oil cylinder seat 3 to the inside of the oil cylinder 1. The oil inside the oil cylinder 1 is always in communication with the inside of the oil piston rod 2.

[0024] The working principle and usage method of this utility model.

[0025] The oil inlet end of the oil cylinder 1 is connected to an external oil circuit interface (e.g., an oil pipe mounted on a fixed base) through the oil cylinder seat 3 and the right-angle connector 5. This end remains in a relatively fixed position during equipment operation.

[0026] Connect the oil outlet end of the oil piston rod 2 to the oil inlet of the external hydraulic cylinder that needs to perform telescopic movement via the oil nozzle adapter 7. This end will move together with the external hydraulic cylinder.

[0027] An external hydraulic cylinder is mounted on the telescopic platform, and the end of the oil delivery piston rod 2 is connected to the oil inlet of the hydraulic cylinder. When the platform extends or retracts, it drives the hydraulic cylinder and the oil delivery piston rod 2 to move synchronously, thereby achieving hydraulic circuit compensation.

[0028] After the equipment is started, hydraulic oil flows in from the right-angle connector 5 at the fixed end, enters the oil cylinder 1 through the oil cylinder seat 3, and then passes through the cavity inside the oil piston rod 2 and the oil nozzle converter 7, finally supplying the external oil cylinder. Throughout the process, regardless of the movement of the external oil cylinder, the device can automatically adapt to changes in the oil circuit connection length through the relative sliding between the oil piston rod 2 and the oil cylinder 1, maintaining the continuity and unobstructed flow of the oil circuit, eliminating the need for long and easily tangled hoses.

[0029] Dynamic compensation process: When the external actuator (such as the oil cylinder connected to the telescopic platform) moves, it will drive the oil delivery piston rod 2 connected to it to slide linearly relative to the fixed oil delivery cylinder 1.

[0030] When the oil delivery piston rod 2 extends, the volume of one cavity inside the oil delivery cylinder 1 increases, while the volume of the other cavity decreases; the opposite occurs when the oil delivery piston rod 2 retracts.

[0031] Since the upper and lower chambers are connected through the piston rod through hole 21, the oil can flow freely between the inside of the oil delivery cylinder 1 and the inside of the oil delivery piston rod 2, thereby dynamically and unhinderedly compensating for the change in the effective length of the oil circuit caused by the movement of the actuator.

[0032] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A rigid linear volumetric compensation oil conveying device, comprising an oil conveying cylinder (1), characterized in that, The oil cylinder (1) is also provided with an oil piston rod (2). The interior of both the oil cylinder (1) and the oil piston rod (2) is hollow. The interior of the oil piston rod (2) and the interior of the oil cylinder (1) are always in communication. The oil piston rod (2) can slide relative to the oil cylinder (1). The oil inlet of the oil cylinder (1) is connected to an external fixed oil circuit interface. The oil outlet of the oil piston rod (2) is connected to an external movable oil circuit interface. When one end of the oil piston rod (2) slides relative to the interior of the oil cylinder (1), it is always located inside the oil cylinder (1), and the other end of the oil piston rod (2) is always connected to the oil circuit interface of the oil cylinder.

2. The rigid linear volumetric compensation oil conveying device according to claim 1, characterized in that, The oil cylinder (1) has cylinder limiting grooves (11) and first threaded locking grooves (12) inside both ends. The first threaded locking grooves (12) at both ends of the oil cylinder (1) are respectively threaded to the oil cylinder seat (3) and the oil cylinder cover (4). The ends of the oil cylinder seat (3) and the oil cylinder cover (4) are abutted against the inside of the cylinder limiting groove (11). The inside of the oil cylinder seat (3) is provided with an oil delivery channel. The inside of the oil cylinder cover (4) is provided with a cylinder cover inner groove (40) that allows the oil delivery piston rod (2) to slide through.

3. The rigid linear volumetric compensation oil conveying device according to claim 2, characterized in that, One end of the oil cylinder seat (3) extends into the oil cylinder barrel (1). The surface of the oil cylinder seat (3) near the inside of the oil cylinder barrel (1) is also provided with a first annular groove (31). The surface of the first annular groove (31) is provided with a first O-ring seal (32) and a first annular seal (33). The outer surfaces of the first O-ring seal (32) and the first annular seal (33) are deformed by the pressure of the inner wall of the oil cylinder barrel (1).

4. The rigid linear volumetric compensation oil conveying device according to claim 2, characterized in that, The oil cylinder seat (3) is provided with a second threaded locking groove (34) at one end away from the oil cylinder barrel (1). The internal thread of the second threaded locking groove (34) is connected to one end of the right angle connector (5). The outer surface of the right angle connector (5) is also threaded with a locking nut (51). A metal washer (52) is provided between the locking nut (51) and the oil cylinder seat (3). The inside of the right angle connector (5) is hollow and the right angle connector (5) is connected to the oil cylinder barrel (1). The other end of the right angle connector (5) is connected to an external fixed oil circuit interface.

5. The rigid linear volumetric compensation oil conveying device according to claim 2, characterized in that, The oil cylinder cover (4) extends into the oil cylinder barrel (1). The surface of the oil cylinder cover (4) near the inside of the oil cylinder barrel (1) is also provided with a second annular groove (41). The surface of the second annular groove (41) is provided with a second O-ring seal (42) and a second annular seal (43). The outer surfaces of the second O-ring seal (42) and the second annular seal (43) are deformed by the pressure of the inner wall of the oil cylinder barrel (1).

6. The rigid linear volumetric compensation oil conveying device according to claim 5, characterized in that, The inside of the oil cylinder cover (4) is also provided with several third annular grooves (44), fourth annular grooves (45) and fifth annular grooves (46) of different widths. Each third annular groove (44) is provided with a third annular sealing ring (47) for guidance. The inside of the fifth annular groove (46) is provided with a dustproof ring (49) made of nitrile rubber. The third annular sealing ring (47) is made of polytetrafluoroethylene. Each fourth annular groove (45) is provided with a step seal (48). The step seal (48) is composed of a stepped part made of polytetrafluoroethylene and an O-shaped part made of nitrile rubber. The inner walls of the third annular sealing ring (47), the step seal (48) and the dustproof ring (49) are deformed by the pressure of the outer wall of the oil piston rod (2).

7. The rigid linear volumetric compensation oil conveying device according to claim 6, characterized in that, One end of the oil delivery piston rod (2) is externally fitted with a piston body (6). The piston body (6) is provided with a sixth annular groove (61). The interior of the sixth annular groove (61) is provided with a fourth annular sealing ring (62) for guidance. The material of the fourth annular sealing ring (62) is polytetrafluoroethylene. The other end of the oil delivery piston rod (2) passes through the interior of the cylinder head inner groove (40), the third annular sealing ring (47), the step seal ring (48), and the dustproof ring (49) to the outside. The outer surface of the fourth annular sealing ring (62) is deformed by the pressure of the inner wall of the oil delivery cylinder (1).

8. The rigid linear volumetric compensation oil conveying device according to claim 7, characterized in that, The oil delivery piston rod (2) is also fitted with an oil nozzle conversion head (7) near the outer end. The oil nozzle conversion head (7) has an oil passage inside and the oil passage is connected to the inside of the oil delivery piston rod (2). A third O-ring seal (71) is also provided between the oil nozzle conversion head (7) and the end of the oil delivery piston rod (2). The oil delivery piston rod (2) also has a piston rod through hole (21) inside. The axis of the piston rod through hole (21) is perpendicular to the axis of the oil delivery piston rod (2) and the piston rod through hole (21) is used to balance the pressure on both sides of the piston body (6) inside the oil delivery cylinder (1).

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