One-way micro-motion pressure cylinder

Abstract

The invention discloses a one-way micro-motion pressure cylinder which is composed of a cylinder body, a piston and an elastic sealing ring, the cylinder body and the piston are respectively provided with a contact face with the elastic sealing ring, a space defined by the cylinder body, the piston and the elastic sealing ring is a fluid cavity, pressure fluid flows in or out to generate pressure on the piston, the maximum total length of the pressure cylinder is L1, and the minimum total length of the pressure cylinder is L2. When the fluid cavity is unloaded, the piston is pushed to the cylinder body through the piston reset device, the fluid cavity is established through the cylinder body, the piston and the elastic sealing ring, the structure is simple, the pressure intensity of 63 Mpa or above can be borne, sealing is stable and reliable, the fluid hole can be formed in the cylinder body or the piston or the elastic sealing ring, and the sealing effect is good. And piston position resetting devices in various forms can be arranged to enable the pressure cylinder to work stably.

Description

Technical Field

[0001] The invention relates to a pressure cylinder, in particular to a one-way micro-motion pressure cylinder. 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 one-way micro-motion pressure cylinder, which can effectively solve the deficiencies in the prior art.

[0004] The present invention is realized through the following technical scheme: a one-way micro-motion pressure cylinder, which is composed of a cylinder body 1, a piston 2 and an elastic sealing ring 3. The cylinder body and the piston respectively have contact surfaces with the elastic sealing ring 3. The space enclosed by the three is a fluid cavity, and there is a fluid hole for pressure fluid to flow in or out. When the pressure fluid flows in, pressure is generated on the piston 2. The maximum total length of the pressure cylinder is L1. When the fluid cavity is unloaded, a piston reset device pushes the piston toward the cylinder body to make the total length L2. The minimum total length is L2. L1-L2 is the maximum stroke of the pressure cylinder piston.

[0005] As a preferred technical solution, the cylinder body has a fixed stopper blocked on the outside of the elastic sealing ring.

[0006] As a preferred technical solution, the piston has a fixed stopper blocked on the inner side of the elastic sealing ring.

[0007] As a preferred technical solution, a reset elastic ring is installed on the piston stop. When the cylinder length is L2, the elastic force of the reset elastic ring is greater than the elastic force of the elastic sealing ring.

[0008] As a preferred technical solution, the reset wedge is pushed and the cylinder body is fixed by the wedge seat, the piston is provided with a wedge hole, and the wedge is pushed to drive the piston to reset.

[0009] As a preferred technical solution, an eccentric shaft seat is provided on the cylinder body, a hole is provided on the piston, and the eccentric shaft rotates to push the piston to reset.

[0010] As a preferred technical solution, the generatrix where the cylinder body, the piston and the elastic sealing ring contact each other can be a straight line or a curve.

[0011] As a preferred technical solution, the fluid holes can be arranged on the cylinder body, the piston and the elastic sealing ring.

[0012] As a preferred technical solution, when the fluid hole is arranged on the elastic sealing ring, the elastic sealing ring is composed of a skeleton with a fluid hole and an elastic sealing layer.

[0013] The beneficial effects of the present invention are as follows: the present invention utilizes a cylinder body, a piston, and an elastic sealing ring to establish a fluid chamber, has a simple structure and can withstand a pressure of more than 63 MPa, has a stable and reliable seal, and can be provided with various forms of piston position resetting devices to enable the pressure cylinder to work stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] 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.

[0015] Figure 1 The maximum length stroke state of the pressure cylinder of the present invention;

[0016] Figure 2 The minimum stroke length state of the pressure cylinder of the present invention;

[0017] Figure 3 The circular elastic sealing ring of the present invention is in the original state;

[0018] Figure 4 The circular elastic sealing ring of the present invention is in the state of L1;

[0019] Figure 5 The circular elastic sealing ring of the present invention is in the state of L2;

[0020] Figure 6 The outer side of the elastic sealing ring is blocked at the cylinder stop of the present invention;

[0021] Figure 7 This is a diagram of the inner side of the elastic sealing ring blocked by the piston stop of the present invention;

[0022] Figure 8 It is the installation diagram of the resetting elastic sealing ring of the present invention;

[0023] Fig. 9 It is a schematic diagram of the inclined wedge resetting device of the present invention;

[0024] Fig.10 It is a schematic diagram of the eccentric shaft resetting device of the present invention;

[0025] Fig.11 This is a schematic diagram of the eccentricity of the eccentric shaft of the present invention;

[0026] Fig.12 The elastic sealing ring of the present invention has a rectangular cross section;

[0027] Fig.13 The elastic sealing ring of the present invention has a W-shaped cross section;

[0028] Fig.14 It is a schematic diagram of the working of the pressure cylinder of the present invention;

[0029] Fig.15 This is a schematic diagram of the resetting stopper of the present invention;

[0030] Fig.16 It is a cross-sectional view of a double-sided elastic sealing ring with a skeleton fluid hole of the present invention;

[0031] Fig.17 It is a three-sided cross-sectional view of the skeleton fluid hole of the present invention;

[0032] Fig.18 It is a four-sided cross-sectional view of the skeleton fluid hole of the present invention; Description of the drawings:

[0034] 1. Cylinder body; 2. Piston; 3. Elastic sealing ring; 31. Original state of elastic sealing ring; 32. State of elastic sealing ring at L1; 33. State of elastic sealing ring at L2; 4. Contact surface of elastic sealing ring at cylinder stop; 5. Contact surface of elastic sealing ring at piston stop; 6. Reset elastic ring; 61. Reset elastic ring fixing seat; 7. Oblique wedge; 71. Oblique wedge seat; 72. Oblique wedge hole of piston; 8. Eccentric shaft; 81. Eccentric shaft seat; 82. Eccentric shaft hole of piston; 83. Eccentric section; 9. Fluid cavity; 10. Force frame; 11. Extruded object; 12. Reset stopper; 34. Rectangular cross-section elastic sealing ring; 35. W-shaped cross-section elastic sealing ring; 36. Fluid hole; 37. Sealing skeleton; 38. Elastic sealing layer of sealing ring with skeleton; 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] The specific meanings of the above terms in the present invention should be understood by the specific circumstances.

[0038] Example 1

[0039] like Figure 1 , Figure 2 , Figure 8 , Fig.14 As shown, Fig.14 As shown, the cylinder 1 is fixed on a force frame 10, the piston 2 can move back and forth, and the extruded object 11 is placed therein. The extruded object 11 can be a cold extrusion mold and a workpiece, or a die-casting mold, an injection mold, etc. Figure 3 , Figure 4 , Figure 5 As shown in the figure, the original state 31 of the O-shaped elastic sealing ring, the state 32 of the elastic sealing ring when it is at L1, and the state 33 of the elastic sealing ring when it is at L2 are represented respectively. There is an elastic sealing ring 3 between the cylinder body 1 and the piston 2. A reset elastic fixing seat 61 is also installed on the cylinder body. There is a stop on the piston 2 and a reset elastic ring 6 is arranged between the reset elastic ring fixing seat 61. A fluid cavity is formed between the cylinder body 1, the elastic sealing ring 3 and the piston 2. There is a fluid hole (not shown in the figure) on the cylinder body. A pressure fluid is injected into the fluid cavity. The injected fluid generates a thrust F on the piston to push the piston 2 to Figure 1 State, at this time the maximum total length of the pressure cylinder can be L1, after the work is completed, the pressure in the fluid cavity is unloaded, and the reset elastic ring 6 pushes the piston 2 back to the position Figure 2 state, at this time the total length of the pressure cylinder is L2, when in Figure 2 In the state, the elastic force of the reset elastic ring 6 in the moving direction of the piston 2 is greater than or equal to the elastic force of the elastic sealing ring 3 in the same direction. When the pressure fluid is injected into the fluid chamber 9, the piston 2 is pushed to Figure 1 state, at this time the total length is limited by the extruded object and is less than or equal to L1, and the elastic sealing ring 3 is Figure 1 When the pressure cylinder is in the state, it is squeezed by the cylinder body and the piston so that the pressure fluid in the fluid chamber will not leak. Figure 2 In the state, the elastic sealing ring 3 is squeezed to the size of A3, and the elastic sealing ring 3 needs to be repeatedly squeezed and released between the sizes of A3 and A2 without causing cracking.

[0040] Example 2

[0041] The difference from Example 1 is that Figure 6 As shown, the outer side of the elastic sealing ring 3 is in contact with the cylinder stop elastic sealing ring contact surface 4, as shown in FIG. Figure 7 As shown, the inner side of the elastic sealing ring 3 is in contact with the piston stop elastic sealing ring contact surface 5, so that the elastic sealing ring 3 is more stable in sealing.

[0042] Example 3

[0043] The difference from Example 1 is that the piston 2 is reset by an inclined wedge device, such as Fig. 9As shown, the cylinder body 1 is fixed with an inclined wedge seat 71, and the inclined wedge seat 71 has a piston inclined wedge hole 72. The inclined wedge 7, the inclined wedge seat 71, and the piston 2 have a piston inclined wedge hole 72. The inclined wedge 7 passes through the inclined wedge seat 71 and the piston inclined wedge hole 72. When an external force pushes the inclined wedge 7, the inclined wedge 7 moves in the direction of the arrow in the figure, and the inclined wedge 7 pushes the piston 2 to move to overcome the resistance of the elastic sealing ring 3, so that the piston 2 reaches Figure 2 position, at this time, the extruded object 11 can enter the extruded space, the inclined wedge 7 is pulled out, and the pressure fluid flows into the fluid cavity 9 to perform the extrusion work.

[0044] Example 4

[0045] The difference from the first embodiment is that the piston 2 is reset by an eccentric shaft mechanism, such as Fig.10 As shown, an eccentric shaft seat 81 is fixed on the cylinder body 1, and a piston eccentric shaft hole 82 is provided on the piston 2. The eccentric shaft 8 passes through the piston eccentric shaft hole 82. When the eccentric section 83 of the eccentric shaft 8 is driven to rotate to the upper part, the piston 2 is pushed to Figure 2 The position shown in the figure, at this time, the extruded object 11 enters the extruded space, and the eccentric shaft 8 is rotated to inject the pressurized fluid into the lower fluid cavity 9 through the eccentric section 83, and the extrusion work can be started.

[0046] Example 5

[0047] Different from the above embodiments, Fig.15 As shown, there is a reset stopper 12 between the piston 2 and the cylinder body 1. The reset stopper 12 can be installed on the cylinder body 1 or on the piston 2, and can also automatically limit the reset position to prevent the elastic sealing ring from being cracked due to excessive extrusion.

[0048] Example 6

[0049] like Fig.12 , Fig.13 As shown, what is different from the above embodiments is that the cross-sectional shape of the elastic sealing ring can be rectangular or W-shaped.

[0050] Example 7

[0051] Different from the above embodiments, the fluid hole is arranged on the piston (not shown in the figure), and the fluid enters and exits the fluid chamber through the fluid hole on the piston.

[0052] Example 8

[0053] Different from the above embodiments, the fluid hole is arranged on the elastic sealing ring, such as Fig.18 As shown, the elastic sealing ring is composed of a sealing frame 37 and an elastic sealing layer 38 with a sealing ring with a frame. The frame has fluid holes 36 for the fluid to pass through. The elastic sealing layer 38 with a sealing ring with a frame can be selected to be double-sided, three-sided or four-sided according to the contact requirements of the elastic sealing ring. Fig.18 It is the cross section of the double-sided elastic sealing layer. Fig.18 The cross-sectional shape of the middle elastic sealing layer is not limited to an arc shape and can be designed arbitrarily.

[0054] The beneficial effects of the present invention are: a fluid cavity is established by utilizing a cylinder body, a piston, and an elastic sealing ring, the structure is simple and can withstand a pressure of more than 63 MPa, the sealing is stable and reliable, and various forms of piston service devices can be arranged to enable the pressure cylinder to work stably.

[0055] 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. A one-way micro-motion pressure cylinder, Features: It consists of a cylinder body 1, a piston 2 and an elastic sealing ring 3. The cylinder body and the piston have contact surfaces with the elastic sealing ring 3 respectively. The space enclosed by the three is a fluid cavity with fluid holes for pressure fluid to flow in or out. When the pressure fluid flows in, pressure is generated on the piston 2. The maximum total length of the pressure cylinder is L1. When the fluid cavity is unloaded, a piston reset device pushes the piston toward the cylinder body to make the total length L2. The minimum total length is L2. L1-L2 is the maximum stroke of the pressure cylinder piston.

2. The one-way micro-motion pressure cylinder according to claim 1, Features: The cylinder body has a fixed stopper which blocks the outer side of the elastic sealing ring.

3. The one-way micro-motion pressure cylinder according to claim 1, Features: The piston has a fixed stop which is blocked on the inner side of the elastic sealing ring.

4. The one-way micro-motion pressure cylinder according to claim 1, Features: A reset elastic ring is arranged on the piston stop. When the total length of the pressure cylinder is L2, the elastic force of the reset elastic ring is greater than the elastic force of the elastic sealing ring.

5. The one-way micro-motion pressure cylinder according to claim 1, Features: The wedge seat is fixed with the reset wedge being pushed and the cylinder body, and the piston is provided with a wedge hole. The wedge is pushed to drive the piston to reset.

6. The one-way micro-motion pressure cylinder according to claim 1, Features: An eccentric shaft seat is arranged on the cylinder body, and a hole is arranged on the piston. The rotation of the eccentric shaft pushes the piston to reset.

7. The one-way micro-motion pressure cylinder according to claim 1, Features: The cross-sectional shape of the elastic sealing ring can be O-shaped, rectangular or W-shaped.

8. The one-way micro-motion pressure cylinder according to claim 1, Features: The generatrix where the cylinder body, the piston and the elastic sealing ring contact can be a straight line or a curve.

9. The one-way micro-motion pressure cylinder according to claim 1, Features: The fluid holes can be arranged on the cylinder body, the piston and the elastic sealing ring.

10. The one-way micro-motion pressure cylinder according to claim 9, Features: When the fluid hole is arranged on the elastic sealing ring, the elastic sealing ring is composed of a framework with the fluid hole and an elastic sealing layer.

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