Micro-motion pressure cylinder capable of being effectively sealed

Abstract

An elastic sealing ring is arranged between the end face of a piston in the advancing direction and the end face of a spigot of a cylinder body, after the piston is pressed, the sealing ring is extruded to increase the contact area with the end face of the piston and the end face of the spigot of the cylinder body, and the sealing ring can make contact with the inner wall of the cylinder body or the side face of a piston rod at the same time. And no relative sliding block is arranged between the sealing ring and each contact surface, so that sliding wear is avoided, the surface roughness of each contact surface is not required, the manufacturing is easy, the sealing is reliable and stable, and the sealing device is very suitable for a pressure cylinder requiring micro-size feeding, especially a large-tonnage pressure cylinder.

Description

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] The pressure cylinder is a commonly used pressure output device. Usually, a fluid boosting device such as an air pump, a water pump, or an oil pump boosts the fluid to push the piston in the pressure cylinder and generate pressure through the piston rod. In the existing technology, fluid boosting has developed rapidly. For example, a plunger pump can easily reach a pressure of 63Mpa, and a water jet boosting device can reach 100Mpa or even 400Mpa. However, the seals used for the piston in the pressure cylinder become the weak point of the entire system. For example, in a two-plate four-cylinder boosted clamping mold, large die-casting machines and injection molding machines generally have oil leakage problems at a pressure of 36Mpa. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a micro-motion pressure cylinder that can effectively seal, which can effectively solve the deficiencies in the prior art.

[0004] The present invention is realized through the following technical scheme: a micro-motion pressure cylinder capable of effective sealing, comprising a cylinder body and a piston assembly, wherein there is fluid in the cylinder, there are holes on the cylinder body for the fluid to flow, there is a fluid pressure regulating device for regulating the fluid pressure, and also comprises an elastic seal, wherein there is a contact surface with the elastic seal on the piston assembly, there is a contact surface with the elastic seal on the cylinder body, the elastic seal is 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 the 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.

[0005] As a preferred technical solution, the elastic sealing member is in contact with the side surface of the cylinder body or the side surface of the piston assembly rod at the same time.

[0006] 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.

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

[0008] As a preferred technical solution, an elastic support ring is provided between the cylinder side wall and the outer periphery of the piston assembly or between the outer periphery of the piston rod and the inner periphery of the cylinder stop.

[0009] 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.

[0010] 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.

[0011] As a preferred technical solution, the contact line between the contact surface between the piston assembly end face and the cylinder stop and the elastic sealing ring can be perpendicular or inclined to the pressure direction of the pressure cylinder.

[0012] As a preferred technical solution, the piston assembly is provided with a limit ring in the pressure direction.

[0013] As a preferred technical solution, the elastic sealing ring can be circular, rectangular or W-shaped.

[0014] The beneficial effects of the present invention are as follows: an elastic sealing ring is arranged between the end face of the piston in the forward direction and the end face of the cylinder stop, and 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 that stable sealing can be achieved. There is no relative sliding block between the sealing ring and the contact surfaces, so there is no sliding wear, and no requirements are made on the surface roughness of the contact surfaces. 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

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0016] Figure 1 It is a schematic diagram of the pressure cylinder of the present invention;

[0017] Figure 2 It is a schematic diagram of the elastic sealing ring of the pressure cylinder and the piston combination of the inner wall of the pressure cylinder of the present invention, wherein the outer peripheries of the two rods are in contact at the same time;

[0018] Figure 3 It is a schematic diagram of the pressure cylinder screw assembly of the present invention;

[0019] Figure 4 It is a schematic diagram of the pressure cylinder welding assembly of the present invention;

[0020] Figure 5 It is a schematic diagram of the elastic positioning of the outer periphery of the piston assembly 2 of the present invention;

[0021] Figure 6 It is a schematic diagram of the elastic positioning of the two rods of the piston assembly of the present invention;

[0022] Figure 7 It is a schematic diagram of the internal pressure of the elastic sealing ring of the present invention;

[0023] Figure 8 It is a schematic diagram of the external pressure of the elastic sealing ring of the present invention;

[0024] Fig. 9 It is a schematic diagram of the pressure cylinder of the present invention being used in a three-platen die-casting injection molding machine;

[0025] Fig.10 A top view of a three-plate die-casting injection molding machine of the present invention;

[0026] Fig.11 It is a schematic diagram of the gate plate with inclined wedge die-casting injection molding machine of the present invention;

[0027] Fig.12 It is a schematic diagram of an O-ring of the present invention;

[0028] Fig.13 It is a schematic diagram of a rectangular sealing ring of the present invention;

[0029] Fig.14 It is a schematic diagram of a W-shaped sealing ring of the present invention;

[0030] Fig.15 This is a schematic diagram of the structure of the limiting sleeve with piston assembly 2 of the present invention;

[0031] Fig.16 It is a schematic diagram of the hollow pressure cylinder of the present invention;

[0032] Fig.17 It is a schematic diagram of the hollow pressure cylinder assembly of the present invention;

[0033] Description of reference numerals:

[0034] 1. Cylinder; 101. Cylinder stop elastic sealing ring contact surface; 102. Cylinder side wall; 103. Cylinder stop elastic sealing ring contact surface (internal pressure inclined surface); 104. Cylinder body (screw connection); 105. Cylinder stop plate (screw connection); 106. Cylinder body (welding); 107. Cylinder stop plate (welding); 108. Cylinder stop elastic positioning ring groove; 109. Hollow cylinder; 1091. Hollow pressure cylinder body; 1092. Hollow pressure cylinder outer stop plate; 1093. Hollow pressure cylinder inner stop plate; 2. Piston assembly 2 assembly; 201. Piston assembly 2 assembly pressure surface; 202. Piston assembly 2 assembly elastic sealing ring contact surface; 203. Pressure surface; 204. Piston assembly 2 rod side; 20 5. The contact surface of the elastic sealing ring of piston assembly 2 (internal pressure inclined surface); 206. The contact surface of the elastic sealing ring of piston assembly 2 (external pressure inclined surface); 207. The 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 positioning ring; 8. Limit sleeve; 9. One plate; 10. Mould beam; 11. Two plates; 12. Three plates; 13. Gate; 131. Wedge gate; 132. Wedge; 14. Gate track; 15. Two plate fixed guide rail; 16. Two plate moving guide rail; 17. Moving mould; 18. Fixed mould; 19. Wedge cylinder; 20. Elastic sealing inner ring. DETAILED DESCRIPTION

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

[0036] Any feature disclosed in this specification (including any additional claims, abstract and drawings), unless otherwise stated, may be replaced by other equivalent or alternative features with similar purposes. 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 is necessary to understand 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, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

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

[0039] Terms such as "upper", "above", "lower", "below", etc. 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 may be oriented in other ways (rotated 90 degrees or other orientations), and the spatially related descriptors used herein interpreted accordingly.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "disposed", "socketed", "connected", "through", "plugged" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Example 1

[0042] like Figure 1 As shown, the cylinder body 1 is composed of a cylinder body main body (screw connection) 104 and a cylinder stop plate (screw connection) 105 assembled by a plurality of screws 5 to form a cylinder body 1, and a piston assembly 2 assembly 2 is installed therein, and an elastic sealing ring is arranged 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 body reaches a pressure of 63Mpa under the action of the hydraulic pump, the hydraulic oil acts on the piston assembly 2 assembly pressure surface 201 of the piston assembly 2 assembly 2 and the piston assembly 2 assembly is pressed. 2 combination 2 is pushed away from the cylinder body, and the elastic sealing ring 3 is pressed by the piston combination 2. The contact surface of the piston combination 2 elastic sealing ring on the combination 2 is 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 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 Fig.12 , Fig.13 , Fig.14 The O-shaped sealing ring 301, rectangular sealing ring 302 and W-shaped sealing ring 303 shown can all be used.

[0044] like Figure 5 As shown, 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] like Figure 6 As shown, there is an elastic positioning ring 7 between the rod side 204 of the piston assembly 2 and the elastic positioning ring groove 108 of the cylinder stop.

[0046] like Fig.15 As shown, 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] like Figure 4 As shown, different from Example 1, 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] like Figure 7 As shown, the difference from Example 1 is that the contact surface of piston assembly 2, the contact surface of the elastic sealing ring of piston assembly 2 (internal pressure inclined surface) 205, and the contact surface of the elastic sealing ring of cylinder stop (internal pressure inclined surface) 103 on the cylinder body 1 are inclined in the direction of the pressure cylinder pressure, so that the elastic sealing ring 3 is in contact with the side surface 204 of the piston assembly 2 rod at the same time.

[0051] Example 4

[0052] like Figure 8 As shown, 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 of the piston assembly 2 are inclined outward and make the elastic sealing ring 3 contact with the cylinder side wall 102 at the same time.

[0053] Example 5

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

[0055] The fixed mold 18 is mounted on the first plate 9, and the movable mold 17 is mounted on the second plate 11. A gate plate 13 and a pressure cylinder of the present invention are arranged between the second plate 11 and the third plate 12. The pressure cylinder piston assembly 2 applies pressure to the gate plate 13 through the pressure surface 203. The gate plate 13 presses the second plate to press the movable mold and the fixed mold tightly. A gate plate track 14 is arranged under the gate plate 13. The gate plate 13 can enter or exit the machine along the track. Fig.10 The state is the exit state, the moving direction of the fixed cylinder 1 piston combination 2 combination 2 on the third plate 12 is consistent with the moving direction of the second plate 11, Fig. 9 The middle is the clamping state of the fixed and movable molds. Fig.10 yes Fig. 9 The top view shows that the gate plate 13 exits the machine at the same time, and the second plate 11 drives the movable mold 17 to retreat, and the fixed and movable molds are separated, and the workpiece demoulding operation state can be carried out.

[0056] Example 6

[0057] like Fig.11 As shown, 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] like Fig.16 , Fig.17 As shown, the hollow cylinder body 109 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, and the hollow piston assembly 208 is installed therein. An elastic sealing ring 3 and an elastic sealing inner ring 20 are respectively provided between the annular hollow piston and the outer stop plate 1092 of the hollow pressure cylinder and the inner stop plate 1093 of the hollow pressure cylinder to form an inner and outer ring seal, thereby forming a hollow pressure cylinder.

[0060] The beneficial effects of the present invention are as follows: an elastic sealing ring is arranged between the end face of the piston in the forward direction and the end face of the cylinder stop, and 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 that stable sealing can be achieved. There is no relative sliding block between the sealing ring and the contact surfaces, so there is no sliding wear, and no requirements are made on the surface roughness of the contact surfaces. 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 is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope 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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