Micro-motion pressure cylinder which can be effectively sealed

Abstract

A micro-motion pressure cylinder which can be effectively sealed, comprising a cylinder body (1) and a piston assembly (2). A fluid is provided in the cylinder, and the cylinder body (1) is provided with a hole for the fluid to flow through and is provided with a fluid pressure regulating device that regulates the fluid pressure. Said pressure cylinder further comprises elastic sealing members (3). The piston assembly (2) is provided with a contact surface (202) in contact with the elastic sealing members (3), the cylinder body (1) is provided with a contact surface (101) in contact with the elastic sealing members (3), and each elastic sealing member (3) is mounted between the two contact surfaces. When a pressured surface (201) of the piston assembly (2), under the action of the pressure of the fluid (4), pushes the piston assembly (2) away from the cylinder body (1), the distance between the two contact surfaces becomes smaller, so that the elastic sealing members (3) are compressed and deformed to enlarge the contact area between the elastic sealing members (3) and the two contact surfaces. The described pressure cylinder can be manufactured conveniently and sealed reliably and stably.

Description

A micro-motion pressure cylinder capable of effective sealing Technical Field

[0001] The invention relates to a pressure cylinder, in particular to a micro-motion pressure cylinder capable of effective sealing. Background Art

[0002] Pressure cylinders are commonly used pressure output devices. Usually, fluid boosting devices such as air pumps, water pumps, and oil pumps boost the fluid pressure to push the piston in the pressure cylinder and generate pressure through the piston rod. Fluid boosting technology has developed rapidly. For example, plunger pumps can easily reach a pressure of 63 MPa, and water jet boosting devices can reach 100 MPa or even 400 MPa. However, the seals used for the piston in the pressure cylinder become the weak point of the entire system. For example, two-platen four-cylinder boosted clamping molds, large die-casting machines, and injection molding machines generally have oil leakage problems at a pressure of 36 MPa.

[0003] Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a micro-motion pressure cylinder that can effectively seal and effectively solve the deficiencies in the prior art.

[0005] The present invention is achieved through the following technical solutions: a micro-pressure cylinder with effective sealing, including a cylinder body and a piston assembly, fluid in the cylinder, holes on the cylinder body for fluid flow, a fluid pressure regulating device for regulating the fluid pressure, and an elastic seal, a contact surface between the piston assembly and the elastic seal, a contact surface between the cylinder body and the elastic seal, and the elastic seal installed between the two contact surfaces. When the pressure surface of the piston assembly pushes the piston assembly away from the cylinder body under the action of fluid pressure, the distance between the two contact surfaces becomes smaller, the elastic seal is squeezed and deformed, and the contact area between the elastic seal and the two contact surfaces is expanded.

[0006] As a preferred technical solution, the elastic sealing member contacts the side surface of the cylinder body or the side surface of the piston assembly rod at the same time.

[0007] As a preferred technical solution, the cylinder body is composed of a cylinder body main body and a cylinder body stop plate combined by screws.

[0008] As a preferred technical solution, the cylinder body is composed of a cylinder body main body (welded) and a cylinder stop plate (welded) combined through welds.

[0009] As a preferred technical solution, an elastic support ring is provided between the side wall of the cylinder body and the outer periphery of the piston assembly or between the outer periphery of the piston rod and the inner periphery of the cylinder body stop.

[0010] As a preferred technical solution, the cylinder body is a hollow cylinder body, the piston assembly is a hollow annular piston assembly, and the hollow pressure cylinder is composed of an elastic sealing ring and an elastic sealing inner ring.

[0011] As a preferred technical solution, the hollow pressure cylinder is composed of a hollow pressure cylinder body, an outer stop plate of the hollow pressure cylinder, an inner stop plate of the hollow pressure cylinder and a plurality of screws.

[0012] As a preferred technical solution, the contact line between the end face of the piston assembly and the contact surface of the cylinder stop and the elastic sealing ring can be perpendicular or inclined to the pressure direction of the pressure cylinder.

[0013] As a preferred technical solution, the piston assembly is provided with a limit ring in the pressure direction.

[0014] As a preferred technical solution, the elastic sealing ring can be circular, rectangular or W-shaped.

[0015] The beneficial effects of the present invention are: by arranging an elastic sealing ring between the end face of the piston in the forward direction and the end face of the cylinder stop, the sealing ring is squeezed after the piston is compressed to increase the contact area with the end face of the piston and the end face of the cylinder stop, and can contact the inner wall of the cylinder or the side of the piston rod at the same time, so as to achieve stable sealing. There is no relative sliding block between the sealing ring and each contact surface, so there is no sliding wear, and there is no requirement for the surface roughness of each contact surface. It can be easy to manufacture and the sealing is reliable and stable. It is very suitable for pressure cylinders that require small-size feed, especially large-tonnage pressure cylinders. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] FIG1 is a schematic diagram of a pressure cylinder of the present invention;

[0018] FIG2 is a schematic diagram showing the simultaneous contact between the outer periphery of the two rods of the pressure cylinder elastic sealing ring and the pressure cylinder inner wall piston assembly of the present invention;

[0019] FIG3 is a schematic diagram of a pressure cylinder screw assembly according to the present invention;

[0020] FIG4 is a schematic diagram of a pressure cylinder welding assembly according to the present invention;

[0021] FIG5 is a schematic diagram of the elastic positioning of the outer periphery of the piston assembly 2 of the present invention;

[0022] FIG6 is a schematic diagram of the elastic positioning of the two rods of the piston assembly according to the present invention;

[0023] FIG7 is a schematic diagram of the internal pressure of the elastic sealing ring of the present invention;

[0024] FIG8 is a schematic diagram of external pressure of the elastic sealing ring of the present invention;

[0025] FIG9 is a schematic diagram of a pressure cylinder of the present invention used in a three-platen die-casting injection molding machine;

[0026] FIG10 is a top view of a three-platen die-casting injection molding machine according to the present invention;

[0027] FIG11 is a schematic diagram of a gate plate with a wedge die-casting injection molding machine according to the present invention;

[0028] FIG12 is a schematic diagram of an O-ring according to the present invention;

[0029] FIG13 is a schematic diagram of a rectangular sealing ring of the present invention;

[0030] FIG14 is a schematic diagram of a W-shaped sealing ring of the present invention;

[0031] FIG15 is a schematic structural diagram of a limiting sleeve with a piston assembly 2 according to the present invention;

[0032] FIG16 is a schematic diagram of a hollow pressure cylinder of the present invention;

[0033] FIG17 is a schematic diagram of the hollow pressure cylinder assembly of the present invention;

[0034] Explanation of the accompanying symbols: 1. Cylinder body; 101. Contact surface of the elastic sealing ring of the cylinder stop; 102. Cylinder side wall; 103. Contact surface of the elastic sealing ring of the cylinder stop (internal pressure inclined surface); 104. Cylinder body (screw connection); 105. Cylinder stop plate (screw connection); 106. Cylinder body (welded); 107. Cylinder stop plate (welded); 108. Cylinder stop elastic positioning ring groove; 109. Hollow cylinder body; 1091. Hollow pressure cylinder body body; 1092. Hollow pressure cylinder outer stop plate; 1093. Hollow pressure cylinder inner stop plate; 2. Piston combination 2 combination; 20 1. Combination pressure surface of piston assembly 2; 202. Combination elastic sealing ring contact surface of piston assembly 2; 203. Pressure surface; 204. Rod side of piston assembly 2; 205. Combination elastic sealing ring contact surface of piston assembly 2 (internal pressure inclined surface); 206. Combination elastic sealing ring contact surface of piston assembly 2 (external pressure inclined surface); 207. Combination elastic positioning ring groove of piston assembly 2; 208. Hollow annular piston assembly; 3. Elastic sealing ring; 301. O-ring; 302. Rectangular sealing ring; 303. W-ring; 4. Fluid; 5. Screw; 6. Weld; 7. Elastic locating ring; 8. Limiting sleeve; 9. First plate; 10. Mould beam; 11. Second plate; 12. Third plate; 13. Gate; 131. Wedge gate; 132. Wedge; 14. Gate track; 15. Second plate fixed guide rail; 16. Second plate movable guide rail; 17. Movable mould; 18. Fixed mould; 19. Wedge cylinder; 20. Elastic sealing inner ring. DETAILED DESCRIPTION

[0035] All features disclosed in this specification, or all steps in the disclosed methods or processes, except mutually exclusive features and / or steps, can be combined in any manner.

[0036] Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless otherwise stated, may be replaced by other equivalent or similar features. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0037] In the description of the present invention, it should be understood that the terms "one end", "the other end", "outside", "upper", "inside", "horizontal", "coaxial", "center", "end", "length", "outer end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0038] In addition, in the description of the present invention, “a plurality of” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0039] Terms such as "upper", "above", "lower", and "below" used in the present invention to indicate spatial relative positions are used for the purpose of convenience to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. Terms of spatial relative position may be intended to include different orientations of the device in use or operation in addition to the orientation shown in the drawings. For example, if the device in the figure is turned over, the unit described as being "below" or "beneath" other units or features will be located "above" the other units or features. Therefore, the exemplary term "below" can encompass both the above and below orientations. The device can be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0040] In the present invention, unless otherwise expressly specified or limited, terms such as "disposed," "socketed," "connected," "through," and "inserted" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components, unless otherwise expressly specified or limited. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0041] Example 1

[0042] As shown in Figure 1, the cylinder body 1 is composed of a cylinder body (screw connection) 104 and a cylinder stop plate (screw connection) 105, which are assembled with a number of screws 5 to form a cylinder body 1, and a piston assembly 2 assembly 2 is installed therein. There is an elastic sealing ring between the piston assembly 2 assembly elastic sealing ring contact surface 202 on the piston assembly 2 assembly 2 and the cylinder stop elastic sealing ring contact surface 101 on the cylinder stop plate (screw connection) 105. When the hydraulic fluid 4 in the cylinder reaches a pressure of 63Mpa under the action of the hydraulic pump, the hydraulic oil acts on the piston assembly 2 assembly 2 pressure surface 201 of the piston assembly 2 assembly 2 and the piston Combination 2 combination 2 pushes away from the cylinder body, and the elastic sealing ring 3 is elastically deformed by the piston combination 2 combination 2 elastic sealing ring contact surface on the cylinder stop elastic sealing ring contact surface 101 on the cylinder stop plate (screw connection) 105, and the elastic sealing ring 3 is elastically deformed, thereby increasing the contact area with the piston combination 2 combination elastic sealing ring contact surface 202 and the cylinder stop elastic sealing ring contact surface 101, thereby achieving a more effective seal than a conventional sealing ring. There is no relative movement between the elastic sealing ring and the two contact surfaces, and no mechanical wear will be caused, and there is no surface roughness requirement for the contact surface.

[0043] The cross section of the elastic sealing ring is not limited to the O-shaped sealing ring 301, rectangular sealing ring 302 and W-shaped sealing ring 303 shown in Figures 12, 13 and 14, and can be used.

[0044] As shown in FIG5 , there is an elastic positioning ring 7 between the cylinder side wall 102 and the elastic positioning ring groove 207 of the piston assembly 2 .

[0045] As shown in FIG6 , there is an elastic positioning ring 7 between the rod side surface 204 of the piston assembly 2 and the elastic positioning ring groove 108 of the cylinder stop.

[0046] As shown in FIG15 , a limiting sleeve 8 is provided on the piston assembly 2 to control the return stroke of the piston assembly 2 so that the elastic sealing ring 3 is in a sealing state.

[0047] Example 2

[0048] As shown in FIG. 4 , different from the first embodiment, the cylinder body 1 is composed of a cylinder body main body (welded) 106 , a cylinder stop plate (welded) 107 and a weld 6 .

[0049] Example 3

[0050] As shown in Figure 7, the difference from Example 1 is that the contact surface of the piston assembly 2, the contact surface of the elastic sealing ring of the piston assembly 2 (internal pressure inclined surface) 205, and the contact surface of the cylinder body 1, the contact surface of the elastic sealing ring of the cylinder stop (internal pressure inclined surface) 103, are inclined in the direction of the pressure cylinder pressure, so that the elastic sealing ring 3 contacts the side surface 204 of the piston assembly 2 rod at the same time.

[0051] Example 4

[0052] As shown in FIG8 , the difference from Example 1 is that the contact surface of the piston assembly 2 and the elastic sealing ring contact surface (external pressure inclined surface) 206 on the piston assembly 2 are inclined outward and make the elastic sealing ring 3 contact the cylinder side wall 102 at the same time.

[0053] Example 5

[0054] As shown in FIG9 , the present invention is used on a three-plate injection die-casting machine. A plate 9, a three-plate 12, a mold beam 10, and a machine frame are combined. A second plate 11 is mounted on a second-plate movable guide rail 16 in the middle. The second-plate movable guide rail 16 is mounted on a second-plate fixed guide rail 15. The second-plate fixed guide rail 15 and the frame are relatively fixed.

[0055] The fixed mold 18 is mounted on a plate 9, and the movable mold 17 is mounted on the second plate 11. There is a gate 13 and a pressure cylinder of the present invention between the second plate 11 and the third plate 12. The pressure cylinder piston assembly 2 applies pressure to the gate 13 through the pressure surface 203. The gate 13 presses the second plate to press the movable mold and the fixed mold tightly. There is a gate track 14 under the gate 13. The gate 13 can enter or exit the machine along the track. The state shown in Figure 10 is the exit state. The piston assembly 2 of the fixed cylinder 1 on the three plates 12 moves in the same direction as the moving direction of the second plate 11. Figure 9 is the fixed and movable mold clamping state. Figure 10 is a top view of Figure 9. At the same time, the gate 13 exits the machine, and at the same time, the two plates 11 drive the movable mold 17 to retreat, and the fixed and movable molds are separated, and the workpiece demoulding operation state can be performed.

[0056] Example 6

[0057] As shown in Figure 11, the difference from Example 5 is that the gate 13 is composed of a wedge gate 131 and a wedge 132. The wedge 132 is controlled by a wedge cylinder 19 and can be raised and lowered. When the gate 13 needs to exit the machine, the wedge 132 rises to reduce the total length of the gate 13 to facilitate the gate 13 to enter and exit the machine.

[0058] Example 7

[0059] As shown in Figures 16 and 17, the hollow cylinder body 109 is composed of a hollow pressure cylinder body 1091, a hollow pressure cylinder outer stop plate 1092, a hollow pressure cylinder inner stop plate 1093 and a number of screws 5. The hollow piston assembly 208 is installed therein, and an elastic sealing ring 3 and an elastic sealing inner ring 20 are respectively provided between the annular hollow piston and the hollow pressure cylinder outer stop plate 1092 and the hollow pressure cylinder inner stop plate 1093 to form an inner and outer ring seal, thereby forming a hollow pressure cylinder.

[0060] The beneficial effects of the present invention are: by arranging an elastic sealing ring between the end face of the piston in the forward direction and the end face of the cylinder stop, the sealing ring is squeezed after the piston is compressed to increase the contact area with the end face of the piston and the end face of the cylinder stop, and can contact the inner wall of the cylinder or the side of the piston rod at the same time, so as to achieve stable sealing. There is no relative sliding block between the sealing ring and each contact surface, so there is no sliding wear, and there is no requirement for the surface roughness of each contact surface. It can be easy to manufacture and the sealing is reliable and stable. It is very suitable for pressure cylinders that require small-size feed, especially large-tonnage pressure cylinders.

[0061] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection defined in the claims.

Claims

1. An effectively sealed micro-motion pressure cylinder, comprising a cylinder body (1), a piston assembly (2), a fluid in the cylinder, a hole on the cylinder body (1) for the fluid to flow, and a fluid pressure regulating device for regulating the fluid pressure, characterized in that: The invention also comprises an elastic seal (3), a contact surface (202) with the elastic seal (3) on the piston assembly (2), and a contact surface (101) with the elastic seal (3) on the cylinder body (1), wherein the elastic seal is arranged between the two contact surfaces. When the pressure-bearing surface (201) of the piston assembly (2) pushes the piston assembly (22) away from the cylinder body (1) under the pressure of the fluid (4), the distance between the two contact surfaces becomes smaller, the elastic seal (3) is squeezed and deformed, and the contact area between the elastic seal (3) and the two contact surfaces is enlarged.

2. The effective sealing device of the micro-motion pressure cylinder according to claim 1 is characterized in that: The elastic sealing member (3) is in contact with the cylinder body side surface (102) or the piston assembly (2) rod side surface (201) at the same time.

3. The effective sealing device of the micro-motion pressure cylinder according to claim 1 is characterized in that: The cylinder body (1) is composed of a cylinder body main body (104) and a cylinder body stop plate (105) which are assembled by screws (5).

4. The effective sealing device of the micro-motion pressure cylinder according to claim 1 is characterized in that: The cylinder body (1) is composed of a cylinder body main body (106) and a cylinder body stop plate (107) which are assembled through a weld (6).

5. The effective sealing device of the micro-motion pressure cylinder according to claim 1 is characterized in that: An elastic support ring (7) is provided between the cylinder side wall (102) and the outer periphery of the piston assembly (207) or between the outer periphery of the piston rod (204) and the inner periphery of the cylinder stop (108).

6. The effective sealing device for the micro-motion pressure cylinder according to claim 1, characterized in that: The cylinder body is a hollow cylinder body (109), the piston assembly is a hollow annular piston assembly (208), and the hollow pressure cylinder is composed of an elastic sealing ring (3) and an elastic sealing inner ring (20).

7. The effective sealing device of the micro-motion pressure cylinder according to claim 6 is characterized in that: The hollow pressure cylinder is composed of a hollow pressure cylinder body (1091), an outer stop plate (1092) of the hollow pressure cylinder, an inner stop plate (1093) of the hollow pressure cylinder and a plurality of screws (5).

8. The effective sealing device of the micro-motion pressure cylinder according to claim 1 is characterized in that: The contact line between the contact surface of the end surface of the piston assembly (2) and the stop of the cylinder body and the elastic sealing ring (3) can be perpendicular or inclined to the pressure direction of the pressure cylinder.

9. The effective sealing device of the micro-motion pressure cylinder according to claim 1, characterized in that: The piston assembly (2) is provided with a limiting ring in the pressure direction.

10. The effective sealing device of the micro-motion pressure cylinder according to claim 1, characterized in that: The elastic sealing ring can be circular, rectangular or W-shaped.

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