High-precision static pressure supporting oil cylinder
By introducing a combination design of oil reservoir, oil delivery trough, slide plate, stop, spring and directional control groove into the hydrostatic support cylinder, the problems of piston plate displacement and leakage are solved, the positioning accuracy and oil film stiffness are improved, and the service life of the equipment is extended.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2026-04-07
AI Technical Summary
In existing hydrostatic support cylinders, the gap between the piston plate and the inner wall of the cylinder leads to displacement risk, affecting positioning accuracy and oil film stiffness, and the leakage increases when the gap is too large.
The design incorporates an oil storage tank, oil delivery tank, sliding plate, stop, spring, and directional control groove to ensure that the oil forms a stable oil film in the gap between the piston plate and the housing. The directional control groove controls the direction of the oil, reducing the risk of leakage. The oil circulation is achieved through the cooperation of the oil outlet pipe and the oil inlet pipe, avoiding long-term stagnation.
It effectively reduces the risk of piston plate displacement, improves positioning accuracy and oil film stiffness, reduces oil leakage, and extends equipment service life.
Smart Images
Figure CN224093621U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of industrial automation especially relates to a high accuracy static pressure support oil cylinder. BACKGROUND
[0002] The static pressure support oil cylinder forms a very thin lubricating oil film between the friction pairs (such as the piston and the cylinder) of the oil cylinder through the external high-pressure hydraulic system. The oil film generates stable fluid static pressure to completely separate the friction surfaces.
[0003] Because of the gap between the piston sheet and the inner wall of the oil cylinder, if the gap is large, the piston sheet and the oil cylinder inner wall may directly rub due to metal thermal expansion and contraction or slight deformation, causing the piston to be stuck. If the gap is large, the oil film stiffness is reduced, the lateral resistance is poor, and the positioning accuracy is affected. The specific leakage formula is Q leak =πDh 3 Δp / 12μl, wherein h is the gap height, Δp is the pressure difference, and μ is the oil dynamic viscosity.
[0004] Because the piston sheet and the inner wall of the oil cylinder are not in direct contact, the piston sheet often has a displacement space in the interior of the oil cylinder. When the piston sheet is displaced, it is easy to increase the area of the oil cylinder, thereby affecting the oil film stiffness. Therefore, a high-precision static pressure support oil cylinder is proposed to solve the above problems. UTILITY MODEL CONTENTS
[0005] In order to make up for the above shortcomings, the utility model provides a high-precision static pressure support oil cylinder, which aims to improve the problem of the risk of displacement of the piston sheet in the use process in the prior art.
[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme: a high-precision static pressure support oil cylinder, comprising a shell, the inside of the shell is fixedly connected with an oil conveying block, the inside of the oil conveying block on the inner side of the shell is provided with a mounting ring, the inside of the mounting ring is provided with a ball, the inside of the mounting ring is provided with a piston rod, the outer wall of the piston rod is fixedly connected with a piston sheet, the outer wall of the piston sheet is fixedly connected with an oil outlet pipe, the inside of the oil conveying block and the inside of the mounting ring are provided with an oil inlet mechanism, the oil inlet mechanism comprises an oil inlet pipe, the outer wall of the oil inlet pipe is fixedly connected with the inner wall of the oil conveying block, the inner wall of the oil conveying block is provided with an oil storage bin, the inner wall of the oil conveying block on the inner side of the oil storage bin is provided with an oil conveying groove, the inside of the oil conveying groove is provided with a quantity control assembly, and the outer wall of the mounting ring is provided with a direction control groove.
[0007] Further description of the above technical scheme:
[0008] The quantity control assembly comprises a moving groove, the inner wall of the moving groove is slidably connected with a sliding plate, the sliding plate is fixedly connected with a stopper on the side close to the middle part of the oil feeding groove, and the end of the sliding plate away from the stopper is elastically connected with the inner wall of the moving groove through a spring.
[0009] As a further description of the above technical solution:
[0010] The outer wall of the piston sheet is not in contact with the inner wall of the shell, and the gap between the inner wall of the piston sheet and the shell is between 0.02mm and 0.05mm.
[0011] As a further description of the above technical solution:
[0012] The outer wall of the stopper is provided with a rubber coating, and the side of the stopper away from the outer wall of the shell is provided with an inclined chamfer.
[0013] As a further description of the above technical solution:
[0014] The number of the oil feeding grooves and the control grooves is multiple, and the multiple oil feeding grooves and control grooves are equidistantly distributed around the shaft of the shell.
[0015] As a further description of the above technical solution:
[0016] The side of the oil outlet pipe close to the piston sheet is provided with a hole for allowing oil to enter, and the size of the hole is larger than the gap between the piston sheet and the shell.
[0017] As a further description of the above technical solution:
[0018] The end of the oil feeding block close to the middle part of the shell is provided with an annular protrusion for limiting the movement space of the mounting ring.
[0019] As a further description of the above technical solution:
[0020] The shape of the oil storage bin is annular, and the oil storage bin is in communication with all the oil feeding grooves.
[0021] The utility model has the advantages of the following beneficial effects:
[0022] 1、The utility model discloses a device for controlling the direction of oil flow, which comprises a shell, an oil storage bin, an oil feeding groove, a control groove, an oil outlet pipe, a piston sheet and a mounting ring.
[0023] 2. The utility model discloses, through the stop block, spring, sliding plate. The setting of oil inlet pipe and oil outlet pipe ensures that the position where oil enters the shell and discharges from the shell is different, thereby ensuring that the oil used when controlling the piston rod to move can be in a circulating state all the time, and the effect of avoiding the oil being inconvenient to maintain in the shell for a long time is achieved. BRIEF DESCRIPTION OF DRAWINGS
[0024] Figure 1 It is the three-dimensional structure schematic diagram of the whole structure in the utility model;
[0025] Figure 2 It is the three-dimensional structure section schematic diagram of the shell and the inside structure thereof in the utility model;
[0026] Figure 3 It is the three-dimensional structure section schematic diagram of the whole structure in the utility model;
[0027] Figure 4 It is the three-dimensional structure section schematic diagram of the whole structure in the utility model; Figure 3 It is the three-dimensional structure enlarged schematic diagram of A portion in the utility model.
[0028] Legend:
[0029] 1, shell, 2, oil delivery block, 3, mounting ring, 4, ball, 5, piston rod, 6, piston sheet, 7, oil outlet pipe, 8, oil inlet mechanism, 81, oil inlet pipe, 82, oil storage bin, 83, oil delivery groove, 84, control quantity assembly, 841, moving groove, 842, sliding plate, 843, stop block, 844, spring, 85, control direction groove. DETAILED DESCRIPTION
[0030] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.
[0031] With reference to Figure 1 , Figure 3 An embodiment provided by the utility model: a high-precision static pressure support oil cylinder, including the shell 1, the shell 1 is set with cylindrical inner chamber, the inside fixed connection of shell 1 has the oil delivery block 2, the shape of oil delivery block 2 is annular, and oil delivery block 2 is set in the inside of shell 1 near left and right two sides, and the inside of shell 1 in oil delivery block 2 is provided with the mounting ring 3, the outer diameter of mounting ring 3 is less than the inner diameter of oil delivery block 2, and one end of oil delivery block 2 near the middle of shell 1 is provided with annular protrusion for limiting the moving space of mounting ring 3.
[0032] With reference to Figure 2 ,Figure 4 The inner part of the mounting ring 3 is provided with a ball 4, the inner part of the mounting ring 3 is provided with a piston rod 5, the outer wall of the piston rod 5 is fixedly connected with a piston sheet 6, the inner side of the ball 4 is in contact with the outer wall of the piston rod 5, the outer wall of the piston sheet 6 is not in contact with the inner wall of the shell 1, and the gap between the inner wall of the piston sheet 6 and the shell 1 is between 0.02mm and 0.05mm. Through the distance setting, it is ensured that the friction force can be eliminated without affecting the oil film stiffness, and the distance between the inner wall of the mounting ring 3 and the inner wall of the piston rod 5 is consistent with the distance between the inner wall of the shell 1 and the outer wall of the piston sheet 6.
[0033] Referring to Figure 1 - Figure 3 The outer wall of the piston sheet 6 is fixedly connected with an oil outlet pipe 7, the side wall near the piston sheet 6 of the oil outlet pipe 7 is provided with a hole for oil to enter, through the hole, it is ensured that the oil can leave the shell 1 through the oil outlet pipe 7, and the size of the hole is larger than the gap between the piston sheet 6 and the shell 1. Through the size of the hole, it is ensured that the oil with high viscosity can pass through smoothly.
[0034] Referring to Figure 2 - Figure 4 The inner part of the oil conveying block 2 and the inner part of the mounting ring 3 are jointly provided with an oil inlet mechanism 8, the oil inlet mechanism 8 includes an oil inlet pipe 81, the oil inlet pipe 81 and the oil outlet pipe 7 are connected with an external controller, and the controller can control the oil inlet and outlet inside, the outer wall of the oil inlet pipe 81 is fixedly connected with the inner wall of the oil conveying block 2, the inner wall of the oil conveying block 2 is provided with an oil storage bin 82, through the setting of the oil storage bin 82, it is ensured that the oil can be uniformly dispersed in different areas of the shell 1 outside the piston rod 5, the inner part of the shell 1 and the inner part of the oil storage bin 82 are in the initial state of the piston oil, the inner wall of the oil conveying block 2 inside the oil storage bin 82 is provided with an oil conveying groove 83, the shape of the oil storage bin 82 is annular, and the oil storage bin 82 is in communication with all the oil conveying grooves 83. Through the setting of the oil conveying groove 83, it is ensured that the piston oil can enter the shell 1 from different directions.
[0035] Referring to Figure 2 - Figure 4The inside of the oil delivery groove 83 is provided with a quantity control assembly 84, the quantity control assembly 84 comprises a moving groove 841, the inner wall of the moving groove 841 is slidably connected with a sliding plate 842, the gap between the sliding plate 842 and the moving groove 841 is smaller than the gap between the shell 1 and the piston piece 6, the sliding plate 842 is fixedly connected with a stop block 843 on the side close to the middle of the oil delivery groove 83, the outer wall of the stop block 843 is provided with a rubber coating, and the side away from the outer wall of the shell 1 of the stop block 843 is provided with an inclined chamfer, through the arrangement of the inclined chamfer, it is ensured that the piston oil can pass through the stop block 843 through the chamfer after being subjected to the pressure of moving inward, one end of the sliding plate 842 away from the stop block 843 is elastically connected with the inner wall of the moving groove 841 through a spring 844, through the arrangement of the spring 844, it is ensured that there is some resistance when the oil enters the shell 1, so as to avoid that the oil only passes through part of the oil delivery groove 83 due to gravity, and ensure that the oil entering direction achieves the expected effect, the outer wall of the mounting ring 3 is provided with a direction control groove 85, the number of the oil delivery groove 83 and the direction control groove 85 is both multiple, and the multiple oil delivery grooves 83 and the direction control grooves 85 are equidistantly distributed around the shaft of the shell 1, through the equidistant distribution, it is ensured that the oil can enter from different directions, so as to ensure that the piston rod 5 can be in the middle under the action of the thrust.
[0036] Working principle: when in use, when the oil enters, the oil in the oil storage bin 82 generates a force moving towards the inside of the oil delivery groove 83 under stress.
[0037] Since the outer side of the stop block 843 is provided with an inclined surface, the oil can push the stop block 843 through the stop block 843, so that the stop block 843 enters the moving groove 841, since the greater the deformation degree of the spring 844, the greater the elastic force, so it can ensure that the moving distance of the multiple stop blocks 843 is the same, so as to ensure that the amount of oil entering different oil delivery grooves 83 is the same.
[0038] When the oil enters the oil delivery groove 83, it moves towards the direction close to the piston piece 6 under the control of the direction control groove 85.
[0039] When it is necessary to discharge the oil, the controller controls the piston piece 6 to add oil in the opposite direction, and the oil is sucked out through the oil outlet pipe 7, since the position of the hole of the oil outlet pipe 7 is close to the piston piece 6, and the newly added oil is on the leftmost side or the rightmost side, the oil can circulate, so as to avoid that the oil is in the shell 1 for a long time, and cannot be treated immediately after its properties change due to the inability to circulate, so as to ensure the service life of the equipment.
[0040] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application has been described in detail, for the skilled in the art, it still can be modified, or for part of the technical features of the equivalent replacement, the spirit and principles of the present application, made any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.
Claims
1. A high-precision hydrostatic support cylinder, comprising a housing (1), characterized in that: An oil delivery block (2) is fixedly connected inside the housing (1). An installation ring (3) is provided inside the housing (1) on the inner side of the oil delivery block (2). A ball bearing (4) is provided inside the installation ring (3). A piston rod (5) is provided inside the installation ring (3). A piston plate (6) is fixedly connected to the outer wall of the piston rod (5). An oil outlet pipe (7) is fixedly connected to the outer wall of the piston plate (6). An oil inlet mechanism (8) is provided inside the oil delivery block (2) and the installation ring (3). The oil inlet mechanism (8) includes an oil inlet pipe (81). The outer wall of the oil inlet pipe (81) is fixedly connected to the inner wall of the oil delivery block (2). An oil storage chamber (82) is opened on the inner wall of the oil delivery block (2) on the inner side of the oil storage chamber (82). An oil delivery groove (83) is opened on the inner wall of the oil delivery block (2) on the inner side of the oil storage chamber (82). A flow control component (84) is provided inside the oil delivery groove (83). A directional control groove (85) is opened on the outer wall of the installation ring (3).
2. The high-precision hydrostatic support cylinder according to claim 1, characterized in that: The quantity control component (84) includes a moving groove (841), and a sliding plate (842) is slidably connected to the inner wall of the moving groove (841). A stop block (843) is fixedly connected to the side of the sliding plate (842) near the middle of the oil delivery groove (83). The end of the sliding plate (842) away from the stop block (843) is elastically connected to the inner wall of the moving groove (841) by a spring (844).
3. The high-precision hydrostatic support cylinder according to claim 1, characterized in that: The outer wall of the piston plate (6) does not contact the inner wall of the housing (1), and the gap between the inner wall of the piston plate (6) and the housing (1) is between 0.02 mm and 0.05 mm.
4. A high-precision hydrostatic support cylinder according to claim 2, characterized in that: The outer wall of the stop (843) is coated with a rubber material, and the side of the stop (843) away from the outer wall of the housing (1) is provided with an inclined chamfer.
5. A high-precision hydrostatic support cylinder according to claim 1, characterized in that: The number of oil delivery channels (83) and directional control channels (85) is set to multiple, and the multiple oil delivery channels (83) and directional control channels (85) are distributed equidistantly around the axis of the housing (1).
6. A high-precision hydrostatic support cylinder according to claim 1, characterized in that: The oil outlet pipe (7) has a hole on the outer wall near the piston plate (6) to allow oil to enter, and the size of the hole is larger than the gap between the piston plate (6) and the housing (1).
7. A high-precision hydrostatic support cylinder according to claim 1, characterized in that: The oil delivery block (2) has an annular protrusion at one end near the middle of the housing (1) to limit the movement space of the installation ring (3).
8. A high-precision hydrostatic support cylinder according to claim 1, characterized in that: The oil storage tank (82) is ring-shaped and is connected to all oil delivery tanks (83).