Hydraulic servo cylinder mechanism displacement adjusting structure

Abstract

The application discloses a kind of hydraulic servo oil cylinder mechanism displacement adjusting structure, belong to the technical field related to hydraulic servo oil cylinder, including cylinder barrel, cylinder barrel front end is connected with cylinder liner using stepped matching mode, cylinder liner front end is threadedly connected with cylinder cover, mobile piston and the piston rod fixedly connected with mobile piston are arranged between cylinder barrel and cylinder cover, electro-hydraulic servo valve is installed in cylinder barrel top, oil return cavity is provided in cylinder liner top, and oil return cavity is communicated with cylinder liner inside.The adjusting assembly provided in the application realizes manual auxiliary adjustment to the oil return flow of hydraulic servo oil cylinder by the cooperation between sealing plug, sealing column and oil passage in adjusting assembly, and can control the hydraulic oil backflow speed in stages according to different working conditions, solves the technical problems that existing hydraulic servo oil cylinder is difficult to realize manual adjustment of oil return amount outside the electric control system, hydraulic impact is large and displacement control stability is poor.

Description

Technical Field

[0001] This invention belongs to the technical field of hydraulic servo cylinders, specifically relating to a displacement adjustment structure for a hydraulic servo cylinder mechanism. Background Technology

[0002] Hydraulic servo cylinder mechanisms are widely used in automated equipment, construction machinery, pressure control equipment, mold drive equipment, and precision displacement execution systems. They primarily drive a piston rod to perform linear motion through the input and return of hydraulic oil, thereby achieving functions such as pushing, pulling, positioning, and displacement adjustment. Existing hydraulic servo cylinders are typically used in conjunction with solenoid valves, proportional valves, or servo valves for flow control, enabling the adjustment of cylinder operating speed, output pressure, and displacement accuracy.

[0003] In existing technologies, most hydraulic servo cylinder mechanisms rely primarily on electronic control systems to automatically adjust the oil inlet and outlet flow rates. While this meets basic automatic control requirements under normal operating conditions, certain shortcomings remain in practical applications. Especially during equipment debugging, low-speed operation, fine displacement adjustment, or when the electronic control system malfunctions, operators often cannot directly and manually adjust the oil inlet or outlet flow rates within the cylinder, making it difficult to flexibly control the cylinder's operating speed.

[0004] Furthermore, while some existing hydraulic systems are equipped with throttle valves or flow-limiting structures, these structures are typically fixed in the hydraulic circuit, making their adjustment methods relatively simple. Moreover, most require specialized tools for disassembly and adjustment, which is not only cumbersome but also prevents quick adjustment of the inlet or outlet flow rate according to on-site conditions. Simultaneously, the lack of easily manually adjustable structures makes it prone to problems such as excessively rapid cylinder movement, large displacement errors, or significant impact vibrations during equipment maintenance, trial operation, or micro-displacement control, affecting the stability and control accuracy of the hydraulic servo mechanism.

[0005] Furthermore, when the electronic control components in the hydraulic system malfunction, the signal fails, or the power supply is abnormal, traditional hydraulic servo cylinders often struggle to compensate for and adjust the hydraulic flow mechanically, easily leading to a loss of effective cylinder control and even affecting the normal operation of the equipment. Therefore, providing a hydraulic servo cylinder displacement adjustment structure that allows for manual adjustment of the inlet or outlet flow during operation, while also being simple in structure, easy to adjust, and adaptable to various working conditions, has become a pressing technical problem for those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a displacement adjustment structure for a hydraulic servo cylinder mechanism, in order to solve the technical problems of existing hydraulic servo cylinder mechanisms that mainly rely on the electronic control system to adjust the hydraulic oil flow. Under conditions such as equipment debugging, low-speed operation, fine displacement control, and abnormal electronic control, it is difficult to manually adjust the return oil volume, resulting in unstable hydraulic oil return control, low displacement adjustment accuracy, and large hydraulic shock.

[0007] To achieve the above objectives, embodiments of the present invention provide a displacement adjustment structure for a hydraulic servo cylinder mechanism, including a cylinder barrel, a cylinder sleeve connected to the front end of the cylinder barrel in a stepped fit manner, and a cylinder head threadedly connected to the front end of the cylinder sleeve. A movable piston and a piston rod fixedly connected to the movable piston are provided between the cylinder and the cylinder head; an electro-hydraulic servo valve is installed on the top of the cylinder. The top of the cylinder liner is provided with an oil return chamber, which is connected to the inside of the cylinder liner. An adjustment component for adjusting the oil return volume is provided in the oil return chamber. A return port connected to the oil return chamber is opened on the outer end face of the cylinder liner. A return pipe connected to the return port is horizontally installed on the top of the cylinder barrel. The adjustment assembly includes six sealing pillars, which are disposed on the inner wall of the oil return chamber and evenly distributed along the circumference. The length of each sealing pillar increases sequentially from shortest to longest in the circumferential arrangement. A sealing plug is disposed in the oil return chamber, and the outer circumferential surface of the sealing plug is in a sealing sliding fit with the inner wall of the oil return chamber. The surface of the sealing plug has six oil passage holes corresponding to the sealing pillars.

[0008] As a further technical solution, a hexagonal guide sleeve is provided on the other side of the oil return chamber. A through hole coaxially arranged with the hexagonal guide sleeve is opened on the inner side of the oil return chamber. A hexagonal guide post and a stud are sequentially arranged on the side of the sealing plug. The stud passes through the through hole and extends to the outside of the cylinder head. The hexagonal guide post is in a sealing sliding fit with the inner wall of the hexagonal guide sleeve.

[0009] As a further technical solution, a fixed sleeve and a movable sleeve fixedly connected to the outside of the fixed sleeve by bolts are provided on the outer side of the cylinder head. An adjusting nut that is threadedly connected to the stud is rotatably installed between the fixed sleeve and the movable sleeve. Rotating the adjusting nut can drive the stud, the hexagonal guide post and the sealing plug to move axially.

[0010] As a further technical solution, the cylinder tail end is provided with an installation port, and a tail plug is threaded into the installation port. A displacement sensor corresponding to the piston rod is installed in the tail plug.

[0011] As a further technical solution, a circular groove is provided at the front end of the piston rod, an inner threaded rod is provided in the circular groove, and an outer reinforcing sleeve that mates with and connects to the piston rod is fitted inside the circular groove. The outer reinforcing sleeve is also fitted outside the inner threaded rod. A fixing nut is threaded onto the inner threaded rod. The piston rod front end is fitted with the inner reinforcing sleeve, and a connecting flange that connects to the piston rod is installed between the outer reinforcing sleeve and the inner reinforcing sleeve. The outer reinforcing sleeve and the inner reinforcing sleeve are clamped together with bolts to fix the connecting flange.

[0012] As a further technical solution, mounting blocks are welded to the bottom of both the cylinder barrel and the cylinder liner, and the surface of the mounting blocks is provided with several fixing holes.

[0013] As a further technical solution, a number of tie rods are welded to the outer surface of the cylinder liner, the ends of the tie rods penetrate the cylinder barrel, and a clamping nut is threaded to the ends of the tie rods. The clamping nut cooperates with the tie rods to clamp and fix the cylinder barrel and the cylinder liner.

[0014] As a further technical solution, the cylinder liner surface is provided with a sealing sleeve that fits into the return pipe, and the front end of the return pipe is provided with a sealing gasket.

[0015] As a further technical solution, a pair of annular grooves are provided on the side surface of the cylinder liner, and a pair of sealing strips corresponding to and cooperating with the annular grooves are provided on the outer periphery of the cylinder head.

[0016] As a further technical solution, a sealing ring is sleeved on the outside of the hexagonal guide post, and an indicator plate is provided at the outer end of the stud. When the sealing plug is in a fully closed state, the indicator plate is in contact with the adjusting nut.

[0017] The significant technical effect of this invention is that: by setting an adjustment component and utilizing the cooperation between the sealing plug, sealing column and oil passage hole, this invention realizes the manual assistance adjustment of the return oil flow of the hydraulic servo cylinder. The operator can adjust the position of the sealing plug according to the actual working conditions, thereby changing the effective flow area of ​​the oil passage hole, so as to adjust the hydraulic oil return speed and piston rod movement speed, and improve the displacement control accuracy and operation stability of the hydraulic servo cylinder. Meanwhile, by evenly distributing six sealing columns of progressively increasing length along the circumference, the sealing plug forms a gradually changing oil return channel during axial movement, thereby making the oil return adjustment process more continuous and stable, reducing hydraulic shock caused by sudden changes in hydraulic oil flow and piston rod movement vibration. Furthermore, by adjusting the fit between the nut, stud, and hexagonal guide post, the sealing plug can be stably guided and moved, avoiding offset or jamming during adjustment and improving the operational reliability of the adjustment assembly. Furthermore, this invention adds a mechanical manual adjustment structure while retaining the electro-hydraulic servo automatic control function. This allows the hydraulic servo cylinder to still achieve stable adjustment of the hydraulic oil return flow under conditions such as electrical control system malfunction, equipment maintenance, or special operating conditions, thereby improving the adaptability, safety, and overall reliability of the hydraulic servo cylinder mechanism. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, 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] Figure 1 This is a schematic diagram of the displacement adjustment structure of a hydraulic servo cylinder mechanism in one embodiment of the present invention; Figure 2 for Figure 1 Axonometric drawing in; Figure 3 for Figure 1 Axonometric sectional view in the middle; Figure 4 for Figure 1 Axonometric view of the piston rod section; Figure 5 for Figure 1 Axonometric view of the cylinder liner section; Figure 6 for Figure 1 Another isometric view of the cylinder liner section; Figure 7 for Figure 5 Axonometric sectional view in the middle; Figure 8 for Figure 3 A magnified view of part A in the image; In the diagram: 1. Cylinder barrel; 2. Cylinder liner; 3. Cylinder head; 4. Moving piston; 5. Piston rod; 6. Oil return chamber; 7. Return port; 8. Return pipe; 9. Adjusting assembly; 9-1. Sealing post; 9-2. Sealing plug; 9-3. Oil passage hole; 9-4. Hexagonal guide sleeve; 9-5. Through hole; 9-6. Hexagonal guide post; 9-7. Stud; 9-8. Fixed sleeve; 9-9. Movable sleeve; 9-10. Adjusting nut; 10. Mounting port; 11. Tail plug; 12. Displacement sensor; 13. Circular groove; 14. Internal threaded rod; 15. Outer reinforcing sleeve; 16. Inner reinforcing sleeve; 17. Connecting flange; 18. Mounting block; 19. Fixing hole; 20. Tie rod; 21. Compression nut; 22. Sealing sleeve seat; 23. Sealing gasket; 24. Annular groove; 25. Sealing strip; 26. Sealing ring; 27. Indicator plate; 28. Electro-hydraulic servo valve. Detailed Implementation

[0020] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0022] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0023] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0025] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0026] In the description of the embodiments in this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. It can be the internal connection between two components or the interaction between two components.

[0027] Please see Figures 1-8 It shows a displacement adjustment structure of a hydraulic servo cylinder mechanism in one embodiment of the present invention, including a cylinder barrel 1, a cylinder sleeve 2 connected to the front end of the cylinder barrel 1 in a stepped fit, and a cylinder head 3 threadedly connected to the front end of the cylinder sleeve 2. A movable piston 4 and a piston rod 5 fixedly connected to the movable piston 4 are provided between the cylinder 1 and the cylinder head 3. An electro-hydraulic servo valve 28 is installed on the top of the cylinder 1. The top of the cylinder liner 2 is provided with an oil return chamber 6, which is connected to the inside of the cylinder liner 2. An adjustment component 9 for adjusting the oil return volume is provided in the oil return chamber 6. A return port 7 connected to the oil return chamber 6 is opened on the outer end face of the cylinder liner 2. A return pipe 8 connected to the return port 7 is horizontally installed on the top of the cylinder barrel 1. The adjusting assembly 9 includes six sealing pillars 9-1, which are disposed on the inner wall of the oil return chamber 6 and evenly distributed along the circumference. The length of each sealing pillar 9-1 increases sequentially from shortest to longest in the circumferential arrangement. A sealing plug 9-2 is disposed inside the oil return chamber 6. The outer circumferential surface of the sealing plug 9-2 is in a sealing sliding fit with the inner wall of the oil return chamber 6. The surface of the sealing plug 9-2 has six oil passage holes 9-3 corresponding to the sealing pillars 9-1. A hexagonal guide sleeve 9-4 is disposed on the other side of the oil return chamber 6. A through hole 9-5 coaxially disposed with the hexagonal guide sleeve 9-4 is disposed inside the oil return chamber 6. The sealing plug 9-2 A hexagonal guide post 9-6 and a stud 9-7 are sequentially arranged on the side. The stud 9-7 passes through the through hole 9-5 and extends to the outside of the cylinder head 3. The hexagonal guide post 9-6 is in a sealing sliding fit with the inner wall of the hexagonal guide sleeve 9-4. A fixed sleeve 9-8 and a movable sleeve 9-9 are provided on the outside of the cylinder head 3 by bolts. An adjusting nut 9-10 that is threadedly connected to the stud 9-7 is rotatably installed between the fixed sleeve 9-8 and the movable sleeve 9-9. Rotating the adjusting nut 9-10 can drive the stud 9-7, the hexagonal guide post 9-6 and the sealing plug 9-2 to move axially.

[0028] Compared with the prior art, this embodiment provides an adjustment component 9. Through the cooperation between the sealing plug 9-2, the sealing column 9-1, and the oil passage hole 9-3 in the adjustment component 9, the manual adjustment function of the return oil flow inside the hydraulic servo cylinder is realized. The operator can adjust the position of the sealing plug 9-2 inside the return oil chamber 6 and change the effective conduction area of ​​the oil passage hole 9-3 according to the actual operating state of the hydraulic servo cylinder, thereby controlling the return speed of the hydraulic oil to achieve auxiliary adjustment of the piston rod 5's moving speed, displacement rhythm, and buffer state. At the same time, the six sealing columns 9-1 with their lengths increasing sequentially in a circumferential order are arranged in cooperation, so that the sealing plug 9-2 can form a gradually changing return oil channel during the movement, thereby making the return oil adjustment process more stable and avoiding the hydraulic shock problem caused by sudden changes in the return oil volume in the traditional structure, improving the stability and displacement control accuracy of the hydraulic servo cylinder during operation.

[0029] Furthermore, by adjusting the fit between the nut 9-10, stud 9-7, and hexagonal guide post 9-6, stable axial movement of the sealing plug 9-2 can be achieved. This not only facilitates manual adjustment by the operator but also ensures the guiding stability of the sealing plug 9-2 during its movement, preventing the sealing plug 9-2 from shifting, rotating, or jamming during adjustment. In addition, by adding a mechanical auxiliary adjustment structure to the automatic control of the electro-hydraulic servo valve 28, even if the electronic control components fail, the power supply is abnormal, or the equipment is being debugged, the operator can still manually adjust the return oil flow rate. This improves the adaptability and reliability of the hydraulic servo cylinder mechanism under complex working conditions and solves the problem of difficulty in quickly and manually adjusting the return oil volume in the existing technology.

[0030] Please see Figure 3 The cylinder 1 has an installation port 10 at its tail end, and a tail plug 11 is threaded into the installation port 10. A displacement sensor 12, which corresponds to and cooperates with the piston rod 5, is installed inside the tail plug 11.

[0031] As a specific embodiment, the displacement sensor 12 can detect the moving position, moving distance, and reciprocating motion state of the piston rod 5 in real time, and feed back the corresponding displacement data to the external control system or monitoring terminal, so that the operator can keep abreast of the operating status of the hydraulic servo cylinder and improve the control accuracy and safety during equipment operation. At the same time, the setting of the displacement sensor 12 can also facilitate the subsequent realization of automated displacement monitoring, data acquisition and remote control functions, thereby improving the intelligence level of the hydraulic servo cylinder mechanism.

[0032] Furthermore, the tail plug 11 is threaded into the mounting port 10, which not only reliably seals the tail end of the cylinder 1, improving the overall sealing performance, but also facilitates the installation, replacement, and subsequent maintenance of the displacement sensor 12. When the displacement sensor 12 malfunctions, the operator can directly disassemble the tail plug 11 for repair, thereby reducing maintenance difficulty and improving the ease of equipment maintenance. Please see Figures 1-8 The piston rod 5 has a circular groove 13 at its front end, and an inner screw 14 is provided in the circular groove 13. An outer reinforcing sleeve 15 that mates with the piston rod 5 is fitted inside the circular groove 13. The outer reinforcing sleeve 15 is also fitted outside the inner screw 14. A fixing nut is threaded onto the inner screw 14. An inner reinforcing sleeve 16 is fitted at the front end of the piston rod 5. A connecting flange 17 that connects to the piston rod 5 is installed between the outer reinforcing sleeve 15 and the inner reinforcing sleeve 16. The outer reinforcing sleeve 15 and the inner reinforcing sleeve 16 are clamped together with bolts to fix the connecting flange 17.

[0033] As a specific embodiment, the outer reinforcing sleeve 15 and the inner reinforcing sleeve 16 can respectively clamp and reinforce the outer and inner sides of the front end of the piston rod 5, so that the front end of the piston rod 5 and the connecting flange 17 form a more stable connection structure, reducing the problem of loosening of the connection part due to vibration, impact or high-frequency reciprocating motion during long-term operation of the hydraulic servo cylinder, and improving the overall connection strength and structural stability.

[0034] Furthermore, the threaded locking fit between the inner screw 14 and the fixing nut can further improve the tensile strength and torsional performance of the piston rod 5 front end, preventing the connecting flange 17 from shifting or falling off under high load conditions. This enhances the applicability and reliability of the hydraulic servo cylinder in heavy-duty equipment, automated drive equipment, and high-frequency operating equipment. At the same time, the clamping and fixing structure between the outer reinforcing sleeve 15 and the inner reinforcing sleeve 16 facilitates the disassembly and replacement of the connecting flange 17, improving the efficiency of later equipment maintenance.

[0035] Please see Figure 2 The bottom of both the cylinder barrel 1 and the cylinder liner 2 are welded with mounting blocks 18, and the surface of the mounting blocks 18 is provided with several fixing holes 19.

[0036] As a specific embodiment, the mounting block 18 can be used for the fixed connection between the hydraulic servo cylinder and the external mounting platform, support frame or mechanical equipment. With the setting of multiple fixing holes 19, the operator can select the corresponding fixing position and installation method according to different installation environments and equipment structures, thereby improving the installation adaptability and on-site installation flexibility of the hydraulic servo cylinder mechanism.

[0037] Furthermore, the mounting block 18 is fixedly connected to the cylinder barrel 1 and cylinder liner 2 by welding, which can improve the overall strength of the mounting structure, avoid the problem of loosening of the mounting parts when the hydraulic servo cylinder is running for a long time or under high frequency vibration, and improve the overall operational stability of the equipment.

[0038] Please see Figure 2 The cylinder liner 2 has several tie rods 20 welded to its outer surface. The ends of the tie rods 20 pass through the cylinder barrel 1. The ends of the tie rods 20 are threaded with a clamping nut 21. The clamping nut 21 cooperates with the tie rods 20 to clamp and fix the cylinder barrel 1 and the cylinder liner 2.

[0039] As a specific embodiment, the cooperation between the tie rod 20 and the clamping nut 21 can form a continuous and stable axial clamping effect on the cylinder barrel 1 and the cylinder liner 2, so that the cylinder barrel 1 and the cylinder liner 2 maintain a reliable connection state, and improve the overall structural strength and connection stability.

[0040] Furthermore, when the hydraulic servo cylinder is in a high-pressure operating state, the tie rod 20 structure can effectively reduce the occurrence of loosening, displacement or widening of gap at the connection between the cylinder barrel 1 and the cylinder liner 2, thereby preventing hydraulic oil from leaking from the connection position, improving the sealing performance and safety performance of the hydraulic system during operation, and facilitating disassembly and maintenance in the later stage.

[0041] Please see Figure 8 The cylinder liner 2 is provided with a sealing sleeve 22 that fits into the return pipe 8, and the front end of the return pipe 8 is provided with a sealing gasket 23.

[0042] As a specific embodiment, the sealing sleeve 22 can limit and guide the reflux tube 8, improve the installation stability between the reflux tube 8 and the reflux port 7, and avoid the reflux tube 8 from shaking or shifting during long-term use.

[0043] Furthermore, by setting the sealing gasket 23, a reliable sealing structure can be formed between the return pipe 8 and the return port 7, reducing the leakage of hydraulic oil during the return process, improving the sealing performance of the return oil system and the utilization efficiency of hydraulic oil, thereby ensuring the overall operational stability of the hydraulic servo cylinder.

[0044] Please see Figure 3 The cylinder liner 2 has a pair of annular grooves 24 on its side surface, and the cylinder head 3 has a pair of sealing strips 25 on its outer periphery that correspond to and cooperate with the annular grooves 24.

[0045] As a specific embodiment, after the sealing strip 25 is embedded in the annular groove 24, it can form a double sealing structure between the cylinder head 3 and the cylinder liner 2, improve the sealing effect at the connection position of the cylinder head 3 and the cylinder liner 2, and reduce the problem of hydraulic oil leakage along the connection gap.

[0046] Furthermore, the double-sealing structure can reduce the problem of external dust, moisture, or impurities entering the hydraulic servo cylinder, thereby improving the stability of the internal operating environment of the hydraulic system and extending the service life of the sealing structure and hydraulic components.

[0047] Please see Figure 7 The hexagonal guide post 9-6 is fitted with a sealing ring 26, and the stud 9-7 is provided with an indicator plate 27 at its outer end. When the sealing plug 9-2 is in a fully closed state, the indicator plate 27 is in contact with the adjusting nut 9-10.

[0048] As a specific embodiment, the sealing ring 26 can improve the sealing performance between the hexagonal guide post 9-6 and the hexagonal guide sleeve 9-4, reduce the problem of hydraulic oil leakage along the guide position, and improve the overall sealing effect of the adjustment assembly 9.

[0049] Furthermore, the indicator plate 27 can be used to visually display the adjustment status of the sealing plug 9-2. The operator can quickly judge the current oil return adjustment degree based on the positional relationship between the indicator plate 27 and the adjusting nut 9-10. When the indicator plate 27 is in contact with the adjusting nut 9-10, it indicates that the sealing plug 9-2 is in a fully closed state, thereby improving the operational convenience and status identification efficiency during the adjustment process of the hydraulic servo cylinder.

[0050] Please see Figures 1-8 As a specific embodiment, when using the displacement adjustment structure of this hydraulic servo cylinder mechanism, hydraulic oil enters the cylinder 1 through the electro-hydraulic servo valve 28 and pushes the moving piston 4 and piston rod 5 to move axially. When the hydraulic oil needs to be returned, the hydraulic oil enters the return oil chamber 6 and is returned through the oil passage 9-3, the return port 7 and the return pipe 8.

[0051] The operator can rotate the adjusting nut 9-10 to move the stud 9-7, hexagonal guide post 9-6, and sealing plug 9-2 axially. During the movement of the sealing plug 9-2, the sealing posts 9-1 of different lengths will gradually block or open the oil passage 9-3, causing the area of ​​the return oil channel to change, thereby achieving graded adjustment of the hydraulic oil return flow. Since the length of the six sealing posts 9-1 increases sequentially, the change in the return oil volume is more continuous and stable, which can effectively reduce hydraulic shock and sudden changes in the movement of the piston rod 5.

[0052] In situations such as equipment debugging, low-speed operation, fine displacement control, or abnormal electro-hydraulic control system conditions, operators can still achieve auxiliary control of hydraulic oil return speed through mechanical adjustment, thereby improving the adaptability and operational reliability of hydraulic servo cylinders under complex working conditions, while also improving the displacement control accuracy, operational stability, and safety of hydraulic servo cylinders.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of protection of the claims of the present invention.

Claims

1. A displacement adjustment structure for a hydraulic servo cylinder mechanism, characterized in that, Includes a cylinder barrel (1), the front end of which is connected to a cylinder liner (2) in a stepped fit, and the front end of the cylinder liner (2) is threadedly connected to a cylinder head (3); A movable piston (4) and a piston rod (5) fixedly connected to the movable piston (4) are provided between the cylinder (1) and the cylinder head (3). An electro-hydraulic servo valve (28) is installed on the top of the cylinder (1). The top of the cylinder liner (2) is provided with an oil return chamber (6), which is connected to the inside of the cylinder liner (2). An adjustment component (9) for adjusting the amount of oil return is provided in the oil return chamber (6). A return port (7) connected to the oil return chamber (6) is opened on the outer end face of the cylinder liner (2). A return pipe (8) connected to the return port (7) is horizontally installed on the top of the cylinder barrel (1). The adjusting component (9) includes six sealing pillars (9-1). The six sealing pillars (9-1) are disposed on the inner wall of the oil return chamber (6) and are evenly distributed along the circumferential direction. The length of each sealing pillar (9-1) increases sequentially from shortest to longest in the circumferential arrangement. A sealing plug (9-2) is disposed in the oil return chamber (6). The outer circumferential surface of the sealing plug (9-2) is in a sealing sliding fit with the inner wall of the oil return chamber (6). The surface of the sealing plug (9-2) is provided with six oil passage holes (9-3) corresponding to the sealing pillars (9-1).

2. The displacement adjustment structure of a hydraulic servo cylinder mechanism according to claim 1, characterized in that, A hexagonal guide sleeve (9-4) is provided on the other side of the oil return chamber (6). A through hole (9-5) coaxially arranged with the hexagonal guide sleeve (9-4) is provided on the inner side of the oil return chamber (6). A hexagonal guide post (9-6) and a stud (9-7) are arranged sequentially on the side of the sealing plug (9-2). The stud (9-7) passes through the through hole (9-5) and extends to the outside of the cylinder head (3). The hexagonal guide post (9-6) is in a sealing sliding fit with the inner wall of the hexagonal guide sleeve (9-4).

3. The displacement adjustment structure of a hydraulic servo cylinder mechanism according to claim 2, characterized in that, The cylinder head (3) is provided with a fixed sleeve (9-8) on the outside and a movable sleeve (9-9) fixed to the outside of the fixed sleeve (9-8) by bolts. An adjusting nut (9-10) that is threadedly connected to the stud (9-7) is rotatably installed between the fixed sleeve (9-8) and the movable sleeve (9-9). Rotating the adjusting nut (9-10) can drive the stud (9-7), the hexagonal guide post (9-6) and the sealing plug (9-2) to move axially.

4. The displacement adjustment structure of a hydraulic servo cylinder mechanism according to claim 1, characterized in that, The cylinder (1) has an installation port (10) at its tail end. A tail plug (11) is threaded into the installation port (10). A displacement sensor (12) that corresponds to and cooperates with the piston rod (5) is installed in the tail plug (11).

5. The displacement adjustment structure of a hydraulic servo cylinder mechanism according to claim 1, characterized in that, The piston rod (5) has a circular groove (13) at its front end. An inner screw (14) is provided in the circular groove (13). An outer reinforcing sleeve (15) that mates with the piston rod (5) is fitted in the circular groove (13). The outer reinforcing sleeve (15) is also fitted outside the inner screw (14). A fixing nut is threaded onto the inner screw (14). An inner reinforcing sleeve (16) is fitted at the front end of the piston rod (5). A connecting flange (17) that connects to the piston rod (5) is installed between the outer reinforcing sleeve (15) and the inner reinforcing sleeve (16). The connecting flange (17) is clamped and fixed between the outer reinforcing sleeve (15) and the inner reinforcing sleeve (16) by bolts.

6. The displacement adjustment structure of a hydraulic servo cylinder mechanism according to claim 1, characterized in that, The bottom of both the cylinder barrel (1) and the cylinder liner (2) are welded with mounting blocks (18), and the surface of the mounting blocks (18) is provided with several fixing holes (19).

7. The displacement adjustment structure of a hydraulic servo cylinder mechanism according to claim 1, characterized in that, The cylinder liner (2) has several tie rods (20) welded to its outer surface. The ends of the tie rods (20) pass through the cylinder barrel (1). The ends of the tie rods (20) are threaded with a clamping nut (21). The clamping nut (21) cooperates with the tie rods (20) to clamp and fix the cylinder barrel (1) and the cylinder liner (2).

8. The displacement adjustment structure of a hydraulic servo cylinder mechanism according to claim 1, characterized in that, The cylinder liner (2) is provided with a sealing sleeve (22) that fits into the return pipe (8), and the front end of the return pipe (8) is provided with a sealing gasket (23).

9. The displacement adjustment structure of a hydraulic servo cylinder mechanism according to claim 1, characterized in that, The cylinder liner (2) has a pair of annular grooves (24) on its side surface, and the cylinder head (3) has a pair of sealing strips (25) on its outer periphery that correspond to and cooperate with the annular grooves (24).

10. The displacement adjustment structure of a hydraulic servo cylinder mechanism according to claim 3, characterized in that, A sealing ring (26) is fitted around the hexagonal guide post (9-6), and an indicator plate (27) is provided at the outer end of the stud (9-7). When the sealing plug (9-2) is in a fully closed state, the indicator plate (27) is in contact with the adjusting nut (9-10).

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