Protection mechanism for over-pressure and over-stroke of nitrogen spring

Abstract

The utility model discloses a protection mechanism for over-pressure and over-stroke of a nitrogen spring, and relates to the technical field of nitrogen springs. The overpressure protection device comprises a cylinder body and an overpressure protection assembly, an inner cavity of the cylinder body is in sliding connection with a piston, the inner cavity of the cylinder body is fixedly connected with a cylinder bottom, an inner cavity of the cylinder bottom is in threaded connection with a plug, the inner cavity of the cylinder bottom is fixedly connected with an inflation valve, a groove is formed in the top of the cylinder bottom, and the overpressure protection assembly is arranged in the groove. An air guide groove is formed in the right side of the bottom of the groove inner cavity. Nitrogen is injected into the inner cavity of the cylinder body through the inflation valve, after nitrogen injection is completed, the bottom of the inflation valve is blocked through the plug, and when extrusion force borne by the piston is too large, the bottom of the pneumatic telescopic rod will make contact with the overpressure protection assembly at the moment, the overpressure protection assembly is clamped, and the cylinder body is protected. Therefore, gas in the cylinder body is discharged out of the cylinder body through the gas guide groove and the gas guide hole, and the cylinder explosion phenomenon caused by the fact that the internal pressure value of the cylinder body is too high is prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of nitrogen springs, in particular to a protection mechanism for nitrogen springs against overpressure and overtravel. Background Art

[0002] Nitrogen spring is a new type of elastic component that uses high-pressure nitrogen as the working medium. It is small in size, has large elastic force, long stroke, stable operation, precision manufacturing, long service life, flat elastic curve, and does not require pre-tightening. It has the ability to perform tasks that conventional elastic components such as metal springs, rubber and air cushions cannot accomplish.

[0003] Nitrogen springs are prone to overpressure and overtravel during use. This overpressure can easily cause the spring to explode, posing a safety hazard to nearby personnel. To address this issue, we've developed a nitrogen spring overpressure and overtravel protection mechanism. Utility Model Content

[0004] The purpose of the utility model is to provide a nitrogen spring over-pressure and over-travel protection mechanism, which solves the problem in the prior art that the nitrogen spring has no over-pressure protection when the stroke is over-pressured by cooperating with a cylinder body, a piston, a cylinder bottom, a screw plug, an inflation valve, an over-pressure protection component, an air guide groove, an air guide hole and a pneumatic telescopic rod.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions.

[0006] Described connecting rod is a hollow tube, and its upper end is provided with internal thread and can be spirally connected with the piston rod of the piston rod and the piston rod bottom.

[0007] The utility model is further configured such that an annular groove is provided on the top of the fixing ring, a first sealing ring is movably connected to the inner cavity of the annular groove, and the top of the first sealing ring is fixedly connected to the sealing plate.

[0008] The utility model is further configured such that three limit rods are fixedly connected to the bottom of the sealing plate, a movable plate is fixedly connected to the bottom of the limit rod, a shell is movably connected to the surface of the movable plate, the bottom of the shell is fixedly connected to the inner wall of the air guide groove, the bottom of the movable plate is fixedly connected to a tension spring, and the bottom of the tension spring is fixedly connected to the inner wall of the shell.

[0009] The present invention is further configured such that a through hole is provided on the top of the shell, and an inner cavity of the through hole is slidably connected to the limiting rod.

[0010] The present invention is further configured such that a sealing block is fixedly connected to the bottom of the fixing column, and a side of the sealing block close to the inner wall of the air guide hole is sealed to the inner wall of the air guide hole.

[0011] The present invention is further configured such that a second sealing ring is fixedly connected to the surface of the piston, and a side of the second sealing ring close to the inner wall of the cylinder is fixedly connected to the inner wall of the cylinder.

[0012] The utility model is further configured such that six positioning rods are fixedly connected to the top of the cylinder bottom, movable rings are movably connected between the surfaces of the six positioning rods, six springs are fixedly connected to the bottom of the movable rings, and the bottoms of the springs are fixedly connected to the cylinder bottom.

[0013] The utility model has the following beneficial effects.

[0014] 1. The utility model injects nitrogen into the inner cavity of the cylinder through the inflation valve. When the nitrogen injection is completed, the bottom of the inflation valve is blocked by a screw plug. When the piston is subjected to excessive extrusion pressure, the bottom of the pneumatic telescopic rod will contact the overpressure protection component, causing the overpressure protection component to be stuck, so that the gas inside the cylinder is discharged from the cylinder through the air guide groove and the air guide hole, thereby preventing the internal pressure of the cylinder from being too high and causing the cylinder to explode.

[0015] 2. The utility model provides a better sealing effect of the sealing plate by arranging a first sealing ring inside the annular groove; by arranging the coordinated use of the limit rod, the movable plate, the tension spring and the shell, the tension spring cooperates with the shell to pull the movable plate and the limit rod downward, and the limit rod makes the sealing plate more sealed during the downward movement; by arranging a through hole, the movement of the limit rod is facilitated; by arranging a sealing block, the sealing block plays a secondary sealing role on the inside of the cylinder when it contacts the air guide hole; by arranging a second sealing ring, the sealing performance of the piston is increased; by arranging the coordinated use of the positioning rod, the movable ring and the spring, when the piston moves downward, the movable ring and the spring play a buffering role before the piston exceeds the compression stroke. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for describing the embodiments.

[0017] Figure 1 The figure is a three-dimensional diagram of a nitrogen spring overpressure and overtravel protection mechanism.

[0018] Figure 2 A cross-sectional view of a nitrogen spring overpressure and overtravel protection mechanism.

[0019] Figure 3 The figure is a sectional bottom view of a nitrogen spring overpressure and overtravel protection mechanism.

[0020] Figure 4 This is a partial structural cross-sectional view of a nitrogen spring overpressure and overtravel protection mechanism.

[0021] Figure 5 The figure is a cross-sectional schematic diagram of an overpressure protection component in a nitrogen spring overpressure and overtravel protection mechanism.

[0022] Figure 6 A cross-sectional view of a pneumatic telescopic rod in a nitrogen spring overpressure and overtravel protection mechanism.

[0023] In the accompanying drawings: 1. Cylinder body; 2. Piston; 3. Cylinder bottom; 4. Screw plug; 5. Inflating valve; 6. Overpressure protection assembly; 601. Sealing plate; 602. Fixed column; 603. Fixed ring; 604. Movable block; 605. Fixed rod; 606. First sealing ring; 607. Sealing block; 608. Limit rod; 609. Movable plate; 610. Tension spring; 611. Shell; 7. Air guide groove; 8. Air guide hole; 9. Pneumatic telescopic rod; 10. Second sealing ring; 11. Positioning rod; 12. Movable ring; 13. Spring. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] Example 1

[0026] See also Figure 1-6The utility model is a nitrogen spring over-pressure and over-stroke protection mechanism, comprising a cylinder body 1 and an over-pressure protection assembly 6. The inner cavity of the cylinder body 1 is slidably connected to a piston 2, the inner cavity of the cylinder body 1 is fixedly connected to a cylinder bottom 3, the inner cavity of the cylinder bottom 3 is threadedly connected to a screw plug 4, the inner cavity of the cylinder bottom 3 is fixedly connected to an inflation valve 5, a groove is provided on the top of the cylinder bottom 3, an air guide groove 7 is provided on the right side of the bottom of the inner cavity of the groove, an air guide hole 8 is provided on the bottom of the inner cavity of the air guide groove 7, and the right side of the inner cavity of the piston 2 is fixedly connected to a pneumatic valve 5. The telescopic rod 9 and the overpressure protection assembly 6 include a sealing plate 601, the bottom of the sealing plate 601 is fixedly connected to a fixing column 602, the bottom of the sealing plate 601 is movably connected to a fixing ring 603, the side of the fixing ring 603 close to the inner wall of the air guide groove 7 is fixedly connected to the inner wall of the air guide groove 7, the bottom of the sealing plate 601 is movably connected to four movable blocks 604, the inner cavity of the movable block 604 is movably connected to a fixing rod 605 through an axle pin, and the bottom of the fixing rod 605 is fixedly connected to the inner wall of the air guide groove 7.

[0027] Specifically: nitrogen is injected into the inner cavity of the cylinder 1 through the inflation valve 5. When the nitrogen is injected, the bottom of the inflation valve 5 is sealed by the screw plug 4. When the piston 2 is subjected to too much extrusion pressure, the bottom of the pneumatic telescopic rod 9 will contact the side opposite to the surface of the four movable blocks 604, and squeeze the movable block 604, so that the other side of the movable block 604 is tilted. When the other end of the movable block 604 is tilted, the sealing plate 601 is pushed upward. When the sealing plate 601 is pushed upward, it will drive the fixed column 602 and the sealing block 607 to move upward. At this time, the gas inside the cylinder 1 is discharged from the cylinder 1 through the air guide groove 7 and the air guide hole 8, thereby preventing the internal pressure of the cylinder 1 from being too high and causing a cylinder explosion.

[0028] Example 2

[0029] See also Figure 1-6On the basis of the first embodiment, an annular groove is provided on the top of the fixing ring 603, and the inner cavity of the annular groove is movably connected to the first sealing ring 606. The top of the first sealing ring 606 is fixedly connected to the sealing plate 601, and the bottom of the sealing plate 601 is fixedly connected to three limiting rods 608. The bottom of the limiting rod 608 is fixedly connected to a movable plate 609. The surface of the movable plate 609 is movably connected to a shell 611. The bottom of the shell 611 is fixedly connected to the inner wall of the air guide groove 7. The bottom of the movable plate 609 is fixedly connected to a tension spring 610. The bottom of the tension spring 610 is fixedly connected to the inner wall of the shell 611. The shell 611 A through hole is provided at the top, and the inner cavity of the through hole is slidably connected to the limit rod 608. The bottom of the fixed column 602 is fixedly connected to a sealing block 607, and the side of the sealing block 607 close to the inner wall of the air guide hole 8 is sealed with the inner wall of the air guide hole 8. The surface of the piston 2 is fixedly connected to a second sealing ring 10, and the side of the second sealing ring 10 close to the inner wall of the cylinder body 1 is fixedly connected to the inner wall of the cylinder body 1. Six positioning rods 11 are fixedly connected to the top of the cylinder bottom 3, and a movable ring 12 is movably connected between the surfaces of the six positioning rods 11. The bottom of the movable ring 12 is fixedly connected to six springs 13, and the bottom of the spring 13 is fixedly connected to the cylinder bottom 3.

[0030] Specifically: by setting a first sealing ring 606 inside the annular groove, the sealing effect of the sealing plate 601 is improved; by setting the limit rod 608, the movable plate 609, the tension spring 610 and the shell 611 for use in combination, the tension spring 610 cooperates with the shell 611 to pull the movable plate 609 and the limit rod 608 downward, and the limit rod 608 makes the sealing of the sealing plate 601 better during the downward movement; by setting a through hole, the movement of the limit rod 608 is facilitated; by setting a sealing block 607, the sealing block 607 plays a secondary sealing role on the inside of the cylinder body 1 when it contacts the air guide hole 8; by setting a second sealing ring 10, the sealing performance of the piston 2 is increased; by setting the positioning rod 11, the movable ring 12 and the spring 13 for use in combination, when the piston 2 moves downward, the movable ring 12 and the spring 13 play a buffering role before the piston 2 exceeds the compression stroke.

[0031] The working principle of the present invention is as follows: nitrogen is injected into the inner cavity of the cylinder body 1 through the inflation valve 5. When the nitrogen injection is completed, the bottom of the inflation valve 5 is sealed by the screw plug 4. When the piston 2 is subjected to excessive extrusion pressure, the bottom of the pneumatic telescopic rod 9 will contact the side opposite to the surface of the four movable blocks 604, and squeeze the movable block 604, so that the other side of the movable block 604 is tilted. When the other end of the movable block 604 is tilted, the sealing plate 601 is pushed upward. When the sealing plate 601 is pushed upward, it will drive the fixed column 602 and the sealing block 607 to move upward. At this time, the gas inside the cylinder body 1 is discharged from the cylinder body 1 through the air guide groove 7 and the air guide hole 8, thereby preventing the internal pressure value of the cylinder body 1 from being too high and the cylinder explosion phenomenon from occurring.

[0032] The standard parts used in the present invention can all be purchased from the market, and can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology. The control method is automatically controlled by a control unit. The control circuit of the control unit can be implemented by simple programming by technicians in this field, which is common knowledge in this field. Therefore, the control method and circuit connection are no longer explained in detail in the present invention.

[0033] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all details in detail, nor do they limit the present invention to only the specific implementation methods described. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that technicians in the relevant technical field can better understand and utilize the present invention.

Claims

1. A nitrogen spring overpressure and overtravel protection mechanism, comprising a cylinder (1) and an overpressure protection assembly (6), characterized in that: The inner cavity of the cylinder body (1) is slidably connected to the piston (2), the inner cavity of the cylinder body (1) is fixedly connected to the cylinder bottom (3), the inner cavity of the cylinder bottom (3) is threadedly connected to a screw plug (4), the inner cavity of the cylinder bottom (3) is fixedly connected to an inflation valve (5), a groove is provided at the top of the cylinder bottom (3), an air guide groove (7) is provided on the right side of the bottom of the inner cavity of the groove, an air guide hole (8) is provided at the bottom of the inner cavity of the air guide groove (7), and a pneumatic telescopic rod (9) is fixedly connected to the right side of the top of the inner cavity of the piston (2); The overpressure protection assembly (6) comprises a sealing plate (601), the bottom of the sealing plate (601) is fixedly connected to a fixing column (602), the bottom of the sealing plate (601) is movably connected to a fixing ring (603), the side of the fixing ring (603) close to the inner wall of the air guide groove (7) is fixedly connected to the inner wall of the air guide groove (7), the bottom of the sealing plate (601) is movably connected to four movable blocks (604), the inner cavity of the movable block (604) is movably connected to a fixing rod (605) via an axle pin, and the bottom of the fixing rod (605) is fixedly connected to the inner wall of the air guide groove (7).

2. The nitrogen gas spring overpressure and overtravel protection mechanism according to claim 1, characterized in that: An annular groove is provided at the top of the fixing ring (603), and a first sealing ring (606) is movably connected to the inner cavity of the annular groove. The top of the first sealing ring (606) is fixedly connected to the sealing plate (601).

3. The nitrogen gas spring overpressure and overtravel protection mechanism according to claim 1, characterized in that: The bottom of the sealing plate (601) is fixedly connected to three limiting rods (608), the bottom of the limiting rods (608) is fixedly connected to a movable plate (609), the surface of the movable plate (609) is movably connected to a shell (611), the bottom of the shell (611) is fixedly connected to the inner wall of the air guide groove (7), the bottom of the movable plate (609) is fixedly connected to a tension spring (610), and the bottom of the tension spring (610) is fixedly connected to the inner wall of the shell (611).

4. The nitrogen gas spring overpressure and overtravel protection mechanism according to claim 3, characterized in that: A through hole is provided on the top of the shell (611), and the inner cavity of the through hole is slidably connected to the limiting rod (608).

5. The nitrogen gas spring overpressure and overtravel protection mechanism according to claim 1, characterized in that: A sealing block (607) is fixedly connected to the bottom of the fixing column (602), and a side of the sealing block (607) close to the inner wall of the air guide hole (8) is sealed to the inner wall of the air guide hole (8).

6. The nitrogen gas spring overpressure and overtravel protection mechanism according to claim 1, characterized in that: A second sealing ring (10) is fixedly connected to the surface of the piston (2), and the side of the second sealing ring (10) close to the inner wall of the cylinder (1) is fixedly connected to the inner wall of the cylinder (1).

7. The nitrogen gas spring overpressure and overtravel protection mechanism according to claim 1, characterized in that: Six positioning rods (11) are fixedly connected to the top of the cylinder bottom (3), a movable ring (12) is movably connected between the surfaces of the six positioning rods (11), six springs (13) are fixedly connected to the bottom of the movable ring (12), and the bottom of the spring (13) is fixedly connected to the cylinder bottom (3).

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