A composite primary and secondary cylinder quick liquid filling oil cylinder

Abstract

The application discloses a kind of composite primary and secondary cylinder quick liquid filling oil cylinder, including main cylinder body, main piston rod, quick plunger, liquid filling assembly;Piston head on main piston rod is slidably connected with the inner cavity of main cylinder body, and the inner cavity of main cylinder body is divided into first cavity and second cavity;Third cavity is provided in main piston rod and communicated with first cavity;Quick plunger is fixed on main cylinder body and extends into third cavity, and quick plunger is provided with plunger liquid inlet channel communicated with third cavity;Liquid filling cavity connected with liquid filling assembly is provided in main cylinder body, and liquid filling cavity is communicated with first cavity by annular liquid filling flow channel;First liquid filling port, second liquid filling port and third liquid filling port communicated with liquid filling cavity, plunger liquid inlet channel and second cavity are provided on main cylinder body respectively.The composite primary and secondary cylinder quick liquid filling oil cylinder of the application does not need to be additionally configured with external quick cylinder, can meet the working condition requirements of high pressure pressure and high-speed reciprocating operation at the same time, and can adapt to the use demand of fast forging equipment.

Description

Technical Field

[0001] This invention relates to the field of hydraulic cylinder technology, and more specifically, to a composite master-daughter cylinder for rapid fluid filling. Background Technology

[0002] High-speed forging equipment is a core production device in the fields of metal hot forging and precision forging. Hydraulic cylinders, as the core actuators of high-speed forging equipment, directly determine the equipment's operating cycle time, forming accuracy, and operational stability. During continuous forging operations, high-speed forging equipment needs to alternately complete cyclic actions of rapid advance and retreat under no-load conditions and high-pressure pressing under load. Therefore, certain requirements are placed on the matching hydraulic cylinders. The matching hydraulic cylinders must possess the combined action capability of rapid advance and retreat and high-pressure pressing. They must ensure high-speed reciprocating motion under no-load conditions to improve production cycle time, and also meet the requirement of stable high-pressure output under forging conditions to ensure workpiece forming quality.

[0003] Traditional high-speed forging cylinders generally adopt a split structure of "main cylinder + external high-speed cylinder" or a common mother-daughter cylinder structure, which has many technical defects and limitations in use. The filling port of a common built-in mother-daughter cylinder is mostly located on the side wall of the cylinder body. Due to the limitation of the cylinder body's radial dimensions, the filling flow space is limited, and the filling and discharging flow rates cannot be maximized. This results in a significant bottleneck in the cylinder's rapid advance and retraction speeds, making it difficult to improve the overall operating efficiency of the equipment. On the other hand, the split main cylinder with an external high-speed cylinder structure requires reserved installation space and complex connecting pipelines. This not only creates redundancy in the overall equipment structure and a large footprint, but the cumbersome pipelines also generate significant frictional resistance and pressure loss, further reducing the cylinder's response speed. In summary, existing traditional cylinder structures cannot simultaneously meet the dual requirements of large filling flow rate and high movement speed without changing the cylinder body outer diameter, making them unsuitable for the needs of high-cycle, miniaturized high-speed forging equipment. Summary of the Invention

[0004] The purpose of this invention is to provide a composite mother-daughter cylinder for rapid filling, which solves the problem that existing fast forging cylinders cannot simultaneously handle small size, high speed and high pressure conditions.

[0005] To achieve this objective, the present invention adopts the following technical solution: A composite master-daughter cylinder for rapid fluid filling includes a master cylinder body, a master piston rod, a rapid plunger, and a fluid filling assembly. The piston head on the main piston rod is slidably connected to the inner cavity of the main cylinder body, dividing the inner cavity of the main cylinder body into a first cavity and a second cavity, wherein the main piston rod is located in the second cavity; the main piston rod is provided with a third cavity communicating with the first cavity; the quick plunger is fixed on the main cylinder body and extends into the third cavity, and the quick plunger is provided with a plunger inlet channel communicating with the third cavity; The main cylinder body is provided with a filling chamber connected to the filling assembly. The filling assembly is used to fill or drain the filling chamber. The bottom of the filling chamber is provided with an annular filling channel that communicates with the first cavity. The main cylinder body is provided with a first filling port, a second filling port, and a third filling port that communicate with the filling chamber, the plunger inlet channel, and the second cavity, respectively.

[0006] Furthermore, the filling assembly includes a filling valve, a filling tank, and a filling pipe. The filling pipe connects the filling tank and the first connection port of the filling valve. The filling valve is detachably connected to the main cylinder body. The second connection port of the filling valve extends into the filling chamber and communicates with the filling chamber.

[0007] Furthermore, the cross-sectional area of ​​the liquid filling tube is not less than the cross-sectional area of ​​the liquid filling valve; The filling tube is provided with an arc-shaped bend to change the direction of the medium flow.

[0008] Furthermore, the annular liquid filling channel includes several longitudinal liquid filling channels that connect the liquid filling chamber and the first chamber, and the several longitudinal liquid filling channels are arranged in a circular array. On a cross-section perpendicular to the sliding direction of the main piston rod, the cross-sectional area of ​​the filling chamber is adapted to the cross-sectional area of ​​the inner cavity of the main cylinder body. Furthermore, a guide sleeve is provided at one end of the main piston rod near the first cavity. The guide sleeve is fitted onto the outer circumferential surface of the rapid plunger, and a sealing structure is provided between the guide sleeve and the rapid plunger.

[0009] Furthermore, the guide sleeve is provided with a first extension section extending in a direction away from the first cavity, the outer diameter of the first extension section being smaller than the outer diameter of the main body of the guide sleeve, so as to form a step; The main piston rod is provided with a stepped hole that matches the shape of the guide sleeve, and a third sealing ring is provided between the first extension section and the main piston rod.

[0010] Furthermore, a first sealing ring and a second sealing ring are provided between the guide sleeve and the quick plunger; the first sealing ring and the second sealing ring are different from each other; The inner wall of the guide sleeve is provided with at least two sets of first self-lubricating bushings, and the first self-lubricating bushings are staggered from the first sealing ring and the second sealing ring.

[0011] Furthermore, the main cylinder body is detachably connected to a main cylinder end cap at the end near the second cavity, and the main cylinder end cap is sleeved on the outer circumferential surface of the main piston rod; the main piston rod and the main cylinder end cap are slidably connected. A fourth sealing ring and a fifth sealing ring are provided between the main cylinder end cover and the main piston rod; the fourth sealing ring and the fifth sealing ring are different from each other; The inner wall of the main cylinder end cover is provided with at least two sets of second self-lubricating bushings, and the second self-lubricating bushings are staggered from the fourth and fifth sealing rings.

[0012] Furthermore, the end of the main cylinder body near the second cavity is provided with a second recessed cavity that communicates with the inner cavity; The main cylinder end cap is provided with a second extension section extending into the second recessed cavity; A sixth sealing ring is provided between the second extension section and the second recessed cavity.

[0013] Furthermore, a seventh sealing ring and at least two sets of third self-lubricating bushings are provided offset between the piston head and the inner wall of the main cylinder body.

[0014] Furthermore, the quick-release plunger is mounted on the main cylinder body via a clamping flange; The end of the main piston rod near the first cavity is provided with a first recessed cavity; The annular liquid-filled channel is connected to the first submerged cavity.

[0015] Furthermore, the lower side of the liquid-filled oil tank is provided with a drain port and an overflow pipe; the top of the liquid-filled oil tank is provided with an air filter that connects to the outside.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The composite master-slave cylinder provided by this invention operates in three stages: rapid ejection, slow pressurization, and rapid return. During the rapid ejection stage, hydraulic oil is supplied to the third chamber through the second filling port and the plunger inlet channel to drive the main piston rod to slide. Simultaneously, the filling assembly and filling chamber complete a large-flow filling of the first chamber, thus achieving rapid ejection of the main piston rod. During the slow pressurization stage, hydraulic oil is introduced into the first chamber, and high-pressure force is output based on the pressure-bearing area of ​​the piston head, achieving a slow and stable pressurization of the main piston rod. During the rapid return stage, hydraulic oil is introduced into the second chamber through the third filling port, causing the main piston rod to move in the opposite direction. The hydraulic oil inside the first chamber rapidly flows back through the filling assembly, and the hydraulic oil inside the third chamber is discharged outwards, thus achieving rapid return and reset of the main piston rod. The composite master-slave cylinder of the present invention maximizes the flow area of ​​the oil passage while keeping the outer diameter of the main cylinder unchanged by integrating an annular filling channel at the bottom of the filling chamber. This effectively improves the flow capacity of hydraulic oil filling and draining operations, and eliminates the need for an external quick cylinder. It can simultaneously meet the requirements of high pressure bearing and high-speed reciprocating operation. Moreover, the overall structure is compact and the size is small, which can fully adapt to the use needs of high-cycle fast forging equipment.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0020] Figure 1 This is a three-dimensional schematic diagram of the composite mother-daughter cylinder rapid filling oil cylinder in this invention. Figure 1 ; Figure 2 This is a three-dimensional schematic diagram of the composite mother-daughter cylinder rapid filling oil cylinder in this invention. Figure 2 ,in Figure 2 Perspective and Figure 1 Different perspectives; Figure 3 This is a side view of the composite mother-daughter cylinder rapid filling oil cylinder in this invention; Figure 4 For the present invention Figure 3 Sectional view AA, in which Figure 4 The main piston rod is in its initial state; Figure 5 This is a cross-sectional view of the composite mother-daughter cylinder rapid filling oil cylinder of the present invention, wherein... Figure 5 The main piston rod is in a state after moving a certain displacement; Figure 6 For the present invention Figure 4 Enlarged view of point B in the middle; Figure 7 For the present invention Figure 4 Enlarged view of point C in the middle; Figure 8 For the present invention Figure 4 DD section view, in which Figure 8 The main piston rod is in its initial state; Figure 9 For the present invention Figure 4 EE section view.

[0021] Illustrations: 1. Main cylinder body; 11. First cavity; 12. Second cavity; 13. Filling cavity; 14. First filling port; 15. Second filling port; 16. Third filling port; 17. Second recessed cavity; 18. Annular filling channel; 2. Main piston rod; 21. Piston head; 22. Third chamber; 23. Stepped hole; 24. First countersunk chamber; 3. Rapid-acting plunger; 31. Plunger inlet channel; 4. Filling valve; 41. First connecting port; 42. Second connecting port; 5. Filling tank; 51. Drain outlet; 52. Overflow pipe; 53. Air filter; 6. Filling tube; 61. Arc-shaped bend section; 71. Guide sleeve; 711. First extension section; 72. Master cylinder end cap; 721. Second extension section; 73. Clamping flange; 81. First sealing ring; 82. Second sealing ring; 83. Third sealing ring; 84. Fourth sealing ring; 85. Fifth sealing ring; 86. Sixth sealing ring; 87. Seventh sealing ring; 91. First self-lubricating bushing; 92. Second self-lubricating bushing; 93. Third self-lubricating bushing. Detailed Implementation

[0022] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0023] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the connection.

[0024] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] This embodiment provides a composite master-slave cylinder for rapid fluid filling, which can be used in high-speed forging equipment, achieving high-speed operation, high-pressure output, and a compact structure. Combined with... Figures 1-5 As shown, the composite master-slave rapid filling cylinder of this embodiment includes a main cylinder body 1, a main piston rod 2, a rapid plunger 3, and a filling assembly. The main cylinder body 1 has an inner cavity for accommodating at least a portion of the structure of the main piston rod 2. The piston head 21 on the main piston rod 2 is slidably connected to the inner cavity of the main cylinder body 1, dividing the inner cavity of the main cylinder body 1 into a first cavity 11 and a second cavity 12, wherein the main piston rod 2 is located in the second cavity 12; that is, the first cavity 11 forms a rodless cavity, and the second cavity 12 forms a rod cavity. It should be noted that the piston head 21 on the main piston rod 2 is known to those skilled in the art and is used to separate and form the rodless cavity and the rod cavity. The main piston rod 2 has a third cavity 22 communicating with the first cavity 11. In a specific embodiment, the opening of the first cavity 11 faces the third cavity 22. The quick plunger 3 is fixed on the main cylinder body 1 and extends into the third cavity 22. The third cavity 22 and the quick plunger 3 can slide relative to each other. The quick plunger 3 has a plunger inlet channel 31 communicating with the third cavity 22 to deliver hydraulic oil to the third cavity 22. In a specific embodiment, the plunger inlet channel 31 axially penetrates the quick plunger 3 towards the bottom of the third cavity 22, so that the hydraulic oil directly reaches the bottom of the third cavity 22, giving full play to the driving effect of hydraulic pressure. The main cylinder body 1 is provided with a filling chamber 13 connected to the filling assembly, which is used to fill or drain the filling chamber 13. The bottom of the filling chamber 13 is provided with an annular filling channel 18 that communicates with the first chamber 11, so as to realize the mutual flow of hydraulic oil between the filling chamber 13 and the first chamber 11, and to cooperate in completing large-flow, rapid filling and draining operations. In a specific embodiment, combined with... Figure 9As shown, the annular filling channel 18 includes several longitudinal filling channels connecting the filling chamber 13 and the first cavity 11. These longitudinal filling channels are arranged in a circumferential array, which maximizes the total flow area of ​​the annular filling channel 18 while ensuring normal assembly of the internal structure of the main cylinder body 1 and without interfering with the operation of other components. This effectively improves the hydraulic oil filling and discharging efficiency and meets the high-speed oil inlet and outlet requirements of the composite mother-daughter cylinder rapid filling cylinder. At the same time, the several longitudinal filling channels arranged in a circumferential array can achieve uniform circumferential distribution and convergence of hydraulic oil in the filling chamber 13 and the first cavity 11, balancing the oil pressure distribution inside the first cavity 11 and avoiding uneven load and wear problems caused by unilateral force on the main piston rod 2. Furthermore, there are 6 longitudinal filling channels. The main cylinder body 1 is provided with a first filling port 14, a second filling port 15, and a third filling port 16 that are respectively connected to the filling chamber 13, the plunger inlet channel 31, and the second cavity 12. The first filling port 14 is used to supply hydraulic oil to the filling chamber 13 or to discharge hydraulic oil from the filling chamber 13. The second filling port 15 is used to supply hydraulic oil to the plunger inlet channel 31 and the third chamber 22, or to discharge hydraulic oil from the plunger inlet channel 31 and the third chamber 22. The third filling port 16 is used to introduce hydraulic oil into the second chamber 12 to drive the main piston rod 2 to reset, or to discharge hydraulic oil from the second chamber 12. In a specific embodiment, the first filling port 14, the second filling port 15, and the third filling port 16 are all connected to an external hydraulic oil supply source. It should be noted that the external hydraulic oil supply source includes an oil tank, a hydraulic pump, and a hydraulic valve, which are conventional structures known in the art and familiar to those skilled in the art. It is sufficient that hydraulic oil can be supplied in a timely manner according to the working requirements of the cylinder. In particular, on the cross section perpendicular to the sliding direction of the main piston rod 2, the cross-sectional area of ​​the filling chamber 13 is adapted to the cross-sectional area of ​​the inner cavity of the main cylinder body 1, which effectively improves the filling flow rate and the drainage flow rate, realizes rapid filling and rapid drainage, shortens the operation time of filling and draining of the composite mother-daughter cylinder rapid filling cylinder, and ensures that the composite mother-daughter cylinder rapid filling cylinder operates quickly.

[0026] In specific implementation, the operation of the composite mother-daughter cylinder rapid filling oil cylinder described in this embodiment can be divided into a rapid ejection stage, a slow pressurization stage, and a rapid return stage. When the composite master-slave cylinder is in the rapid ejection stage, the hydraulic oil supply source delivers hydraulic oil to the plunger inlet channel 31 through the second filling port 15. The hydraulic oil enters the third chamber 22 through the plunger inlet channel 31, and the hydraulic oil pressure pushes the main piston rod 2 and piston head 21 to slide outward synchronously. At this time, a negative pressure is generated in the first chamber 11. Under the action of the negative pressure, the filling component delivers the hydraulic oil in the filling component to the filling chamber 13, and then guides the hydraulic oil into the connected first chamber 11 through the annular filling flow channel 18, realizing the rapid replenishment of the hydraulic oil in the first chamber 11. The hydraulic oil in the second chamber 12 is discharged outward through the third filling port 16. During this process, the cross-sectional area of ​​the third chamber 22 is smaller than that of the first chamber 11 and the second chamber 12. When the hydraulic oil supply source outputs the same flow rate of hydraulic oil, the main piston rod 2 can achieve a longer movement distance. Under the condition that the hydraulic oil supply source maintains a constant oil supply rate, the rapid action of the main piston rod 2 can be realized. When the composite master-slave cylinder is in the slow pressurization stage, the hydraulic oil supply source introduces hydraulic oil into the first cavity 11 through the first filling port 14, the filling chamber 13, and the annular filling channel 18. The filling assembly is closed, and the large pressure-bearing area of ​​the first cavity 11 forms a high-pressure thrust, driving the main piston rod 2 to move forward at a low speed to complete the pressurization operation. The hydraulic oil in the second cavity 12 is continuously discharged through the third filling port 16. When the composite master-slave cylinder is in the rapid return stage, the hydraulic oil supply source introduces hydraulic oil into the second cavity 12 through the third filling port 16. The hydraulic oil acts on the end face of the piston head 21 and drives the main piston rod 2 to slide in the opposite direction. The filling assembly is opened, and the hydraulic oil inside the first cavity 11 flows into the filling chamber 13 through the annular filling channel 18 and is then rapidly discharged through the filling assembly. The hydraulic oil in the third cavity 22 is discharged outward in sequence through the plunger inlet channel 31 and the second filling port 15, ultimately achieving the rapid return and reset of the main piston rod 2.

[0027] The composite master-slave cylinder described in this embodiment integrates an annular filling channel 18 at the bottom of the filling chamber 13, maximizing the oil passage area while keeping the outer diameter of the main cylinder body 1 unchanged, effectively improving the flow capacity of hydraulic oil filling and draining operations. Compared with traditional sidewall filling channels, this embodiment can maximize the total flow area of ​​the annular filling channel 18 while ensuring the normal assembly of the internal structure of the main cylinder body 1 and not interfering with the operation of other components. In addition, the annular filling channel 18 includes several longitudinal filling channels arranged in a circumferential array, which can realize the uniform distribution and convergence of hydraulic oil in the filling chamber 13 and the first cavity 11 along the circumference, balance the oil pressure distribution inside the first cavity 11, and avoid the problem of uneven load and uneven wear of the main piston rod 2 due to unilateral force. With the cross-sectional area of ​​the filling chamber 13 matching the cross-sectional area of ​​the inner cavity of the main cylinder 1, the hydraulic oil in the first cavity 11 can be rapidly replenished, avoiding the phenomenon of discontinuous oil supply and sluggish movement of the main piston rod 2 caused by excessive negative pressure in the first cavity 11.

[0028] The composite master-slave cylinder described in this embodiment achieves high pressure, high speed, and small size simultaneously. With the same cylinder outer diameter, the filling and discharging flow rates reach the maximum value for cylinders of the same specifications, increasing the rapid advance / retract speed by 30%-50%, without requiring an external rapid cylinder. By integrating the rapid filling function into the main cylinder, the external rapid cylinder and complex piping are eliminated, reducing the overall installation space by more than 25%, thus meeting the miniaturization requirements of fast forging equipment. Furthermore, it can directly replace the traditional master-slave cylinders of existing fast forging equipment without requiring modifications to the equipment's installation foundation, possessing extremely high engineering application value. It can fully adapt to the usage requirements of high-cycle fast forging equipment and can be widely used in metal hot forging equipment, precision stamping equipment, forging production lines, high-frequency reciprocating hydraulic processing equipment, and other scenarios.

[0029] In a specific embodiment, combined with Figure 8 As shown, the first filling port 14 and the filling chamber 13 are connected by a first filling channel to ensure that the filling chamber 13 is normally filled with liquid through the first filling port 14. The second filling port 15 and the plunger inlet channel 31 are connected by a second filling channel to ensure that the plunger inlet channel 31 and the third chamber 22 are normally filled and drained with liquid through the second filling port 15. The third filling port 16 and the second chamber 12 are connected by a third filling channel to ensure that the second chamber 12 is normally filled and drained with liquid through the third filling port 16.

[0030] The filling assembly includes a filling valve 4, a filling oil tank 5, and a filling pipe 6. The filling pipe 6 has a first connecting port 41 and a second connecting port 42, which are respectively connected to the filling chamber 13 of the main cylinder body 1. The filling pipe 6 connects the filling oil tank 5 and the first connecting port 41 of the filling valve 4. The filling valve 4 is detachably connected to the main cylinder body 1, and the second connecting port 42 of the filling valve 4 extends into the filling chamber 13 and communicates with it. In a specific embodiment, the filling pipe 6 extends to the bottom of the filling oil tank 5, which can fully draw hydraulic oil from inside the filling oil tank 5, while preventing air from being drawn into the filling pipe 6, thus avoiding problems such as cavitation, vibration, and unstable pressure during the rapid filling operation of the composite master-daughter cylinder. The flow cross-sectional area inside the filling pipe 6 is not less than the flow cross-sectional area inside the filling valve 4, ensuring sufficient hydraulic oil flow and perfectly matching the flow capacity of the filling valve 4, ensuring efficient rapid filling and drainage. The flow cross-sectional area within the filling valve 4 is not less than 1 / 3 of the radial cross-sectional area of ​​the piston head 21, which can fully meet the high flow rate requirements of negative pressure filling and draining of the first chamber 11, effectively improving the filling and draining response speed. The filling pipe 6 is provided with an arc-shaped bend 61 to change the flow direction of the medium, effectively reducing the local flow resistance when the hydraulic oil changes direction, avoiding eddies and turbulence caused by right-angle bends, reducing hydraulic oil pressure loss, and improving the stability of hydraulic oil delivery. The lower side of the filling tank 5 is provided with a drain port 51 and an overflow pipe 52, used to discharge deposited dirt and discharge excess medium from the filling tank 5, respectively. The top of the filling tank 5 is provided with an air filter 53 connected to the outside, used to balance the air pressure inside and outside the filling tank 5 and filter incoming air impurities.

[0031] In specific implementation, when the composite master-slave cylinder is in the rapid ejection stage, a negative pressure is formed inside the first cavity 11. The negative pressure acts on the filling valve 4 and causes the filling valve 4 to open. The hydraulic oil inside the filling tank 5 flows into the filling chamber 13 through the filling pipe 6 and the filling valve 4 in sequence, and is then transported to the first cavity 11 by the filling chamber 13 to complete the rapid filling operation of the first cavity 11. When the composite master-slave cylinder is in the slow pressurization stage, the hydraulic oil pressure inside the first cavity 11 increases. The high-pressure hydraulic oil acts on the filling valve 4 to close the filling valve 4, cutting off the oil circuit between the filling tank 5 and the filling chamber 13, maintaining the stable pressure inside the first cavity 11, and ensuring the normal operation of the pressurization process. When the composite master-slave cylinder is in the rapid return stage, the hydraulic oil inside the first cavity 11 flows back to the filling chamber 13. After the filling valve 4 opens, the hydraulic oil flows back to the filling tank 5 through the filling valve 4 and the filling pipe 6 in sequence, realizing rapid oil return in the oil circuit. It should be noted that the working principle of the filling valve 4 is well known to those skilled in the art. In this embodiment, only the flow cross-sectional area inside the filling valve 4 is further limited. The working principle of the filling valve 4 will not be described in detail here.

[0032] Combination Figure 6As shown, a guide sleeve 71 is provided at one end of the main piston rod 2 near the first cavity 11. The guide sleeve 71 is sleeved on the outer circumferential surface of the fast plunger 3. The guide sleeve 71 is used to radially guide and support the relative sliding of the main piston rod 2 and the fast plunger 3, ensuring their coaxiality and reducing frictional loss during the sliding process. A sealing structure is provided between the guide sleeve 71 and the fast plunger 3. The guide sleeve 71 is provided with a first extension section 711 extending in the direction away from the first cavity 11, forming an elongated structure, increasing the guiding stroke, improving guiding stability, and effectively avoiding uneven wear of the fast plunger 3 during reciprocating sliding. It can adapt to alternating high-speed and high-pressure working conditions. The outer diameter of the first extension section 711 is smaller than the outer diameter of the main body of the guide sleeve 71 to form a step. The step structure is used to limit the guide sleeve 71 inside the main piston rod 2 and prevent the guide sleeve 71 from shifting. The main piston rod 2 is provided with a stepped hole 23 that matches the shape of the guide sleeve 71. A third sealing ring 83 is provided between the first extension section 711 and the main piston rod 2 to seal the assembly gap between the first extension section 711 and the main piston rod 2, preventing hydraulic oil leakage in the first cavity 11 and the third cavity 22. In a specific embodiment, there are two sets of the third sealing ring 83. A first sealing ring 81 and a second sealing ring 82 are provided between the guide sleeve 71 and the quick plunger 3. The first sealing ring 81 and the second sealing ring 82 are different from each other, forming a differentiated combination sealing structure, complementing the sealing performance advantages of the two types of sealing rings, and improving the comprehensiveness of sealing protection. In a specific embodiment, the first sealing ring 81 and the second sealing ring 82 are respectively a Glyd ring and a U-ring. Combining the sealing advantages of the Glyd ring and the U-ring, a multi-layer sealing system is constructed, which greatly improves the sealing reliability of the mating position between the guide sleeve 71 and the quick plunger 3. It can fully adapt to the working conditions of high-speed operation of the composite mother-daughter cylinder quick-filling cylinder and the internal pressure of hydraulic oil, effectively preventing hydraulic oil leakage under high-speed movement and high-pressure conditions. The inner wall of the guide sleeve 71 is provided with at least two sets of first self-lubricating bushings 91, which reduce the sliding friction between the guide sleeve 71 and the fast plunger 3 during relative movement, improve the smoothness of reciprocating motion, and delay the wear of parts. The first self-lubricating bushings 91 are staggered from the first sealing ring 81 and the second sealing ring 82. The at least two sets of first self-lubricating bushings 91 can form a multi-point radial support structure on the inner wall of the guide sleeve 71, which effectively constrains the radial runout of the fast plunger 3 during high-speed reciprocating sliding and effectively avoids the fast plunger 3 from unilateral wear.In a specific embodiment, the first self-lubricating bushing 91 is made of self-lubricating copper sleeve, which has excellent wear resistance and self-lubricating properties. The first self-lubricating bushing 91 is provided in two sets, one set of which is located on the inner wall of the first extension section 711, and the other set of which is located on the inner wall of the guide sleeve 71 body, so as to form a front and rear distributed double support structure, which greatly improves the overall guiding accuracy and support rigidity of the guide sleeve 71 for the fast plunger 3. At the same time, in conjunction with the extended structure formed by the first extension section 711, it further reduces the problems of swaying, uneven wear, and jamming that occur when the fast plunger 3 moves at high speed, and ensures the stability of the fast plunger 3 in long-term high-speed reciprocating motion.

[0033] Combination Figure 7 As shown, the main cylinder body 1 is detachably connected to a main cylinder end cap 72 at the end near the second cavity 12. The main cylinder end cap 72 is sleeved on the outer circumferential surface of the main piston rod 2, and is used to radially guide and position the reciprocating sliding of the main piston rod 2, and to constrain the radial runout of the main piston rod 2. The main piston rod 2 and the main cylinder end cap 72 are slidably connected. A fourth sealing ring 84 and a fifth sealing ring 85 are provided between the main cylinder end cap 72 and the main piston rod 2. The fourth sealing ring 84 and the fifth sealing ring 85 are different from each other, forming a differentiated combination sealing structure, complementing the sealing performance advantages of the two types of sealing rings, and improving the comprehensiveness of sealing protection. In a specific embodiment, the fourth sealing ring 84 and the fifth sealing ring 85 are a Y-ring and a Step seal, respectively. The Y-ring has stable low-pressure sealing performance and strong adaptability, and the Step seal has the advantages of high-pressure wear resistance and excellent anti-leakage performance, which takes into account the sealing requirements of low-pressure rapid movement and high-pressure pressure holding conditions, effectively preventing the leakage of hydraulic oil inside the second cavity 12. The inner wall of the main cylinder end cover 72 is provided with at least two sets of second self-lubricating bushings 92, which effectively reduce the mechanical friction generated by the relative reciprocating sliding of the main cylinder end cover 72 and the main piston rod 2, reduce the wear and tear of parts, and ensure the smooth and stable operation of the main piston rod 2. The second self-lubricating bushings 92 are staggered from the fourth sealing ring 84 and the fifth sealing ring 85. The at least two sets of second self-lubricating bushings 92 can form a multi-point support structure on the inner wall of the main cylinder end cover 72, effectively constraining the radial runout of the fast plunger 3 during high-speed reciprocating sliding, and effectively avoiding the situation of unilateral wear of the fast plunger 3. In a specific embodiment, the second self-lubricating bushing 92 is a self-lubricating copper sleeve, which has excellent wear resistance and self-lubricating performance.

[0034] The main cylinder body 1 has a second recessed cavity 17 connected to the inner cavity at its end near the second cavity 12. The main cylinder end cap 72 has a second extension section 721 extending into the second recessed cavity 17, which improves the stability of the connection structure and increases the contact area between the main cylinder end cap 72 and the main piston rod 2, making the main piston rod 2 more stable when moving at high speed. A sixth sealing ring 86 is provided between the second extension section 721 and the second recessed cavity 17 to seal the assembly gap between the second extension section 721 and the second recessed cavity 17, preventing hydraulic oil inside the second cavity 12 from leaking from the joint position. Two sets of the sixth sealing ring 86 are provided to form a double sealing structure, further improving the sealing performance of the assembly joint surface. In a specific embodiment, the second self-lubricating bushing 92 is provided in three sets, of which two sets of the second self-lubricating bushing 92 are provided on the inner wall of the second extension section 721, and the other set of the second self-lubricating bushing 92 is provided on the inner wall of the main body of the master cylinder end cover 72, so as to form a front and rear distributed three-support structure; which greatly improves the overall guiding accuracy and support rigidity of the master cylinder end cover 72 for the fast plunger 3, and at the same time, in conjunction with the extended structure formed by the second extension section 721, further reduces the problems of swaying, uneven wear, and jamming that occur when the fast plunger 3 moves at high speed, and ensures the stability of the fast plunger 3 in long-term high-speed reciprocating motion. A seventh sealing ring 87 and at least two sets of third self-lubricating bushings 93 are staggered between the piston head 21 and the inner wall of the main cylinder body 1. The seventh sealing ring 87 isolates the first cavity 11 and the second cavity 12, preventing the hydraulic oil inside the first cavity 11 and the second cavity 12 from flowing into each other. The self-lubricating bushings reduce the frictional resistance of the piston head 21 during reciprocating motion and slow down the wear rate between the piston head 21 and the inner wall of the main cylinder body 1. The at least two sets of third self-lubricating bushings 93 effectively constrain the radial runout of the fast plunger 3 during high-speed reciprocating sliding, effectively avoiding unilateral wear of the fast plunger 3. In a specific embodiment, the third self-lubricating bushing 93 is a self-lubricating copper sleeve, which has excellent wear resistance and self-lubricating properties. Two sets of the seventh sealing ring 87 are provided. The quick plunger 3 is mounted on the main cylinder body 1 via a clamping flange 73 to facilitate the installation of the quick plunger 3 and to facilitate its disassembly, assembly, and subsequent maintenance. A first recess 24 is provided at the end of the main piston rod 2 near the first cavity 11, and the annular fluid channel 18 is connected to the first recess 24. On the one hand, the first recess 24 can accommodate the protruding part of the clamping flange 73, reducing the overall assembly space and avoiding interference between components. On the other hand, the first recess 24 can store hydraulic oil. When the end of the main piston rod 2 and the end of the first cavity 11 come into contact with each other, the contact area between the two is prone to form a local low pressure or even a local vacuum environment to generate an adsorption force. The presence of the first recess 24 and the hydraulic oil stored in it can destroy this structure, thereby ensuring that the end of the main piston rod 2 can smoothly separate from the end of the first cavity 11 during the start-up phase.

[0035] In practical implementation, the composite master-slave cylinder described in this embodiment, under the alternating working conditions of high-speed sliding and high-pressure bearing of the main piston rod 2, utilizes multiple sets of combined sealing structures and multiple sets of self-lubricating bushings to ensure the overall machine's operating performance. Specifically, the guide sleeve 71 and the rapid plunger 3 employ a combination seal of a Glyd ring and a U-ring filling chamber 13, while the main cylinder end cover 72 and the main piston rod 2 employ a combination seal of a Y-ring and a Step seal filling chamber 13. These two differentiated composite sealing structures can adapt to the alternating working conditions of high-speed sliding and high-pressure sealing, significantly improving the overall sealing reliability of the cylinder and effectively preventing hydraulic oil leakage under high-pressure conditions, seal failure caused by high-speed reciprocating sliding, and oil cross-contamination within the chamber. The composite master-slave cylinder's rapid filling cylinder is equipped with various sealing components such as the sixth sealing ring 86 and the seventh sealing ring 87, which can comprehensively seal the assembly gap of the main cylinder body 1 and the mating gap of the piston head 21, perfecting the overall sealing system and continuously adapting to the sealing requirements of high-pressure working conditions. The first self-lubricating bushing 91, the second self-lubricating bushing 92, and the third self-lubricating bushing 93, which are internally assembled in the guide sleeve 71, the main cylinder end cover 72, and the piston head 21, can continuously reduce the mechanical friction resistance at each mating position during the high-speed reciprocating sliding of the main piston rod 2, weaken the wear and tear and motion jamming caused by high-speed motion, and ensure the smoothness and continuity of the sliding action. At the same time, the guide sleeve 71, the main cylinder end cover 72, and the piston head 21 form a multi-point radial support structure for the main piston rod 2. The multi-point support structure can effectively constrain the radial runout and displacement deviation of the main piston rod 2 during the high-speed sliding process, significantly improve the coaxiality and motion accuracy of the reciprocating motion of the main piston rod 2, so as to ensure the operational stability and structural durability of the composite mother-daughter cylinder rapid filling cylinder under high-speed and high-pressure alternating conditions.

[0036] The composite master-slave cylinder provided in this embodiment operates in three stages: rapid ejection, slow pressurization, and rapid return. During the rapid ejection stage, hydraulic oil is supplied to the third chamber 22 through the second filling port 15 and the plunger inlet channel 31, driving the main piston rod 2 to slide. Simultaneously, the filling assembly and filling chamber 13 complete a large-flow filling of the first chamber 11, thus achieving the effect of rapid ejection of the main piston rod 2. During the slow pressurization stage, hydraulic oil is introduced into the first chamber 11, and high-pressure force is output based on the pressure-bearing area of ​​the piston head 21, thus achieving the effect of slow and stable pressurization of the main piston rod 2. During the rapid return stage, hydraulic oil is supplied to the second chamber 12 through the third filling port 16, causing the main piston rod 2 to move in the opposite direction. The hydraulic oil inside the first chamber 11 flows back rapidly through the filling assembly, and the hydraulic oil inside the third chamber 22 is discharged outwards, thus achieving the effect of rapid return and reset of the main piston rod 2. The composite master-slave cylinder described in this embodiment integrates an annular filling channel 18 at the bottom of the filling chamber 13, maximizing the oil passage area while keeping the outer diameter of the main cylinder body 1 unchanged. This effectively improves the flow capacity of hydraulic oil filling and draining operations, and eliminates the need for an external fast cylinder. It can simultaneously meet the requirements of high pressure bearing and high-speed reciprocating operation, and its overall structure is compact and small in size, making it fully adaptable to the needs of high-cycle fast forging equipment.

[0037] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A composite mother-daughter cylinder for rapid filling, characterized in that: Includes main cylinder body (1), main piston rod (2), quick plunger (3), and filling assembly; The piston head (21) on the main piston rod (2) is slidably connected to the inner cavity of the main cylinder body (1), and divides the inner cavity of the main cylinder body (1) into a first cavity (11) and a second cavity (12); the main piston rod (2) is provided with a third cavity (22) communicating with the first cavity (11); the quick plunger (3) is fixed on the main cylinder body (1) and extends into the third cavity (22), and the quick plunger (3) is provided with a plunger inlet channel (31) communicating with the third cavity (22). The main cylinder body (1) is provided with a filling chamber (13) connected to the filling assembly. The bottom of the filling chamber (13) is provided with an annular filling channel (18) that communicates with the first cavity (11). The main cylinder body (1) is provided with a first filling port (14), a second filling port (15), and a third filling port (16) that communicate with the filling chamber (13), the plunger inlet channel (31), and the second cavity (12), respectively.

2. The composite mother-daughter cylinder for rapid fluid filling according to claim 1, characterized in that: The filling assembly includes a filling valve (4), a filling tank (5), and a filling pipe (6). The filling pipe (6) connects the filling tank (5) and the first connection port (41) of the filling valve (4). The filling valve (4) is detachably connected to the main cylinder body (1). The second connection port (42) of the filling valve (4) extends into the filling chamber (13) and connects with the filling chamber (13).

3. The composite mother-daughter cylinder for rapid filling according to claim 2, characterized in that: The cross-sectional area of ​​the liquid filling tube (6) is not less than the cross-sectional area of ​​the liquid filling valve (4); The filling tube (6) is provided with an arc-shaped bend (61) to change the direction of medium flow.

4. The composite mother-daughter cylinder for rapid fluid filling according to claim 1, characterized in that: The annular liquid filling channel (18) includes several longitudinal liquid filling channels that connect the liquid filling chamber (13) and the first chamber (11), and the several longitudinal liquid filling channels are arranged in a circular array. On a cross section perpendicular to the sliding direction of the main piston rod (2), the cross-sectional area of ​​the filling chamber (13) is adapted to the cross-sectional area of ​​the inner cavity of the main cylinder body (1).

5. The composite mother-daughter cylinder for rapid fluid filling according to claim 1, characterized in that: The main piston rod (2) is provided with a guide sleeve (71) at one end near the first cavity (11). The guide sleeve (71) is sleeved on the outer circumferential surface of the fast plunger (3), and a sealing structure is provided between the guide sleeve (71) and the fast plunger (3).

6. The composite mother-daughter cylinder for rapid fluid filling according to claim 5, characterized in that: The guide sleeve (71) is provided with a first extension section (711) extending in a direction away from the first cavity (11). The outer diameter of the first extension section (711) is smaller than the outer diameter of the main body of the guide sleeve (71) to form a step. The main piston rod (2) is provided with a stepped hole (23) that matches the shape of the guide sleeve (71), and a third sealing ring (83) is provided between the first extension section (711) and the main piston rod (2).

7. The composite mother-daughter cylinder for rapid fluid filling according to claim 5, characterized in that: A first sealing ring (81) and a second sealing ring (82) are provided between the guide sleeve (71) and the quick plunger (3); the first sealing ring (81) and the second sealing ring (82) are different from each other; The inner wall of the guide sleeve (71) is provided with at least two sets of first self-lubricating bushings (91), and the first self-lubricating bushings (91) are staggered from the first sealing ring (81) and the second sealing ring (82).

8. The composite mother-daughter cylinder for rapid fluid filling according to claim 1, characterized in that: The main cylinder body (1) is detachably connected to a main cylinder end cap (72) at the end near the second cavity (12), and the main cylinder end cap (72) is sleeved on the outer circumferential surface of the main piston rod (2); the main piston rod (2) and the main cylinder end cap (72) are slidably connected; A fourth sealing ring (84) and a fifth sealing ring (85) are provided between the main cylinder end cap (72) and the main piston rod (2); the fourth sealing ring (84) and the fifth sealing ring (85) are different from each other; The inner wall of the main cylinder end cap (72) is provided with at least two sets of second self-lubricating bushings (92), and the second self-lubricating bushings (92) are staggered from the fourth sealing ring (84) and the fifth sealing ring (85).

9. The composite mother-daughter cylinder for rapid fluid filling according to claim 8, characterized in that: The main cylinder body (1) has a second recessed cavity (17) connected to the inner cavity at the end near the second cavity body (12). The main cylinder end cap (72) is provided with a second extension section (721) extending into the second recess (17). A sixth sealing ring (86) is provided between the second extension section (721) and the second recess (17).

10. The composite mother-daughter cylinder for rapid fluid filling according to claim 1, characterized in that: A seventh sealing ring (87) and at least two sets of third self-lubricating bushings (93) are provided between the piston head (21) and the inner wall of the main cylinder body (1) respectively. The quick plunger (3) is mounted on the main cylinder body (1) via a clamping flange (73); The main piston rod (2) has a first recessed cavity (24) at the end near the first cavity (11). The annular liquid-filling channel (18) is connected to the first submerged cavity (24); The liquid-filled oil tank (5) is provided with a drain outlet (51) and an overflow pipe (52) at the lower side; the liquid-filled oil tank (5) is provided with an air filter (53) connected to the outside.

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