Nitrogen spring plunger rod protection structure

Abstract

The utility model discloses a nitrogen spring plunger rod protection structure which comprises a cylinder barrel, the inner side wall of the cylinder barrel is fixedly connected with a guide ring, the side surface of the guide ring is fixedly connected with a sealing ring and a limiting ring, the inner side wall of the cylinder barrel is fixedly connected with a sliding rod, and the upper end and the lower end of the sliding rod are fixedly connected with triangular blocks. And the side surface of the plunger rod is in sliding connection with the sealing ring and the limiting ring, and the bottom end of the plunger rod is in sliding connection with the sliding rod. By means of the components, the upper end and the lower end of the sliding rod in the cylinder barrel incline towards the center axis of the cylinder barrel, when the plunger rod slides to the bottom end of the guide ring and the bottom end of the cylinder barrel, the plunger rod can be pressed by the triangular blocks at the upper end and the lower end of the sliding rod towards the center axis of the cylinder barrel, friction force between the plunger rod and the sliding rod is increased, and the speed of the plunger rod and impact force on the cylinder barrel are reduced. Damage to the guide ring and the cylinder barrel is reduced, vertical stress to the plunger rod is reduced, and breakage between the bottom end of the plunger rod and the plunger rod body is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to plunger rod protection technical field, especially in a nitrogen spring plunger rod protection structure. BACKGROUND

[0002] The existing nitrogen spring reduces the impact force between the plunger rod and the cylinder and the guide ring when the plunger rod is impacted up and down, sets the buffer part on the upper and lower ends of the plunger rod to protect the plunger rod and the cylinder and the guide ring impacted by it, but cannot reduce the vertical stress generated on the plunger rod when the plunger rod is impacted, and cannot prevent the bottom end of the plunger rod from being broken, such as a kind of anti-collision nitrogen spring disclosed in Chinese patent, its application number is: CN202322998404.1, it is respectively provided with one and two buffer pads in the lower end and upper end of plunger rod, then the lower limit is buffered by one buffer pad, and the upper limit is buffered by two buffer pads, to avoid the impact force between plunger rod and cylinder and guide sleeve being too large, reduce the damage of device, but when the plunger rod is impacted up and down, the vertical stress received by the bottom end of the plunger rod cannot be reduced, and the breakage between the bottom end of the plunger rod and the plunger rod column body cannot be prevented. SUMMARY

[0003] The utility model discloses the purpose of at least one of the technical problems existing in the prior art is solved, provide a kind of nitrogen spring plunger rod protection structure, the slide bar inside cylinder is respectively inclined to the cylinder center axis and is arranged in upper and lower ends, when plunger rod is respectively slid to the bottom end of guide ring and cylinder bottom, it is pressed to cylinder center axis by the triangular block in upper and lower ends of slide bar, increase the friction between plunger rod and slide bar, reduce its speed reduce its impact force to guide ring and cylinder, reduce the damage that guide ring and cylinder receive, and reduce the vertical stress that plunger rod receives, prevent the breakage between the bottom end of plunger rod and plunger rod column body.

[0004] The utility model discloses still provide with above-mentioned nitrogen spring plunger rod protection structure, include: cylinder, cylinder inner side wall fixedly connected with the guide ring, the guide ring side surface fixedly connected with sealing washer and stop ring, cylinder inner side wall fixedly connected with the slide rod, the slide rod has four and with guide ring lower surface fixedly connected, the slide rod upper and lower ends fixedly connected with the triangular block, plunger rod, plunger rod sets up in the cylinder interior, plunger rod side surface and sealing washer and stop ring slidingly connected, plunger rod bottom end and slide rod slidingly connected, plunger rod side surface slidingly connected with the dust cover. Through above-mentioned component, the slide rod upper and lower ends in the cylinder interior are respectively to the cylinder center shaft and are arranged obliquely, when plunger rod slides to guide ring bottom end and cylinder bottom end respectively, will be pressed to the cylinder center shaft by the triangular block of slide rod upper and lower ends, increase the friction between plunger rod and slide rod, reduce its speed reduce its impact on guide ring and cylinder, reduce the damage that guide ring and cylinder received, and reduce the vertical stress that plunger rod received, prevent the rupture between plunger rod bottom end and plunger rod column.

[0005] According to the nitrogen spring plunger rod protection structure, the limit ring is located directly below the sealing washer, and the lower surface of the limit ring is horizontally connected with the lower surface of the guide ring.

[0006] According to the nitrogen spring plunger rod protection structure, a groove is formed at the position where the bottom end of the plunger rod is in contact with the slide rod, and the upper surface of the sealing washer is fixedly connected with the dust cover.

[0007] According to the nitrogen spring plunger rod protection structure, the dust cover is conical, and grooves are formed in the side surface of the dust cover.

[0008] According to the nitrogen spring plunger rod protection structure, the side surface of the cylinder is provided with an air valve, and the air valve is connected with a gas guide pipe.

[0009] According to the nitrogen spring plunger rod protection structure, two exhaust pipes are formed in the lower surface of the cylinder, and the exhaust pipes are connected with the inside of the cylinder.

[0010] The utility model relates to a nitrogen spring plunger rod protection structure, cylinder bottom sliding connection has the limit post, cylinder bottom fixedly connected with spring, the spring far away cylinder bottom one end fixedly connected with the pressing plate.

[0011] The utility model relates to a nitrogen spring plunger rod protection structure, the limit post upper surface is fixedly connected with the pressing plate, and the pressing plate is slidably connected with the cylinder inner side wall.

[0012] Beneficial effects:

[0013] Compared with the prior art, the utility model discloses that the slide bar inside the cylinder is inclined to the center shaft of the cylinder at both ends, when the plunger rod slides to the bottom end of the guide ring and the bottom end of the cylinder respectively, is pressed to the center shaft of the cylinder by the triangular block at both ends of the slide bar, increases the friction between the plunger rod and the slide bar, reduces its speed and reduces its impact on the guide ring and the cylinder, reduces the damage of the guide ring and the cylinder, and reduces the vertical stress of the plunger rod, prevents the rupture between the bottom end of the plunger rod and the plunger rod column body. BRIEF DESCRIPTION OF DRAWINGS

[0014] The utility model is further illustrated below in connection with the drawings and examples;

[0015] Figure 1 It is whole structure schematic diagram of the utility model nitrogen spring plunger rod protection structure;

[0016] Figure 2 It is the front cross section structure schematic diagram of the utility model nitrogen spring plunger rod protection structure;

[0017] Figure 3 It is the structure schematic diagram of the utility model nitrogen spring plunger rod protection structure Figure 2 A place structure schematic diagram of the utility model nitrogen spring plunger rod protection structure;

[0018] Figure 4 It is the structure schematic diagram of the utility model nitrogen spring plunger rod protection structure Figure 2 B place structure schematic diagram of the utility model nitrogen spring plunger rod protection structure.

[0019] Legend:

[0020] 1, cylinder;2, guide ring;3, sealing ring;4, limit ring;5, slide bar;6, triangular block;7, plunger rod;8, dust cover;9, gas valve;10, gas guide pipe;11, exhaust pipe;12, limit post;13, spring;14, pressing plate. DETAILED DESCRIPTION

[0021] The detailed description of the specific embodiments of the present application will be described in this part, the preferred embodiments of the present application are shown in the drawings, the role of the drawings is to supplement the description of the text part with graphics, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the present application, but it cannot be understood as a limitation on the protection scope of the present application.

[0022] Referring to Figures 1-4 The nitrogen spring plunger rod protection structure of the embodiment of the present application comprises: a cylinder 1 containing nitrogen, a guide ring 2 fixedly connected to the inner side wall of the cylinder 1, so that the plunger rod 7 can only slide vertically, a sealing ring 3 and a limiting ring 4 fixedly connected to the side surface of the guide ring 2, the sealing ring 3 being used to form a sealed environment inside the cylinder 1, and the limiting ring 4 being used to prevent the middle part of the plunger rod 7 from being offset, the limiting ring 4 being located directly below the sealing ring 3 and limiting the middle part of the plunger rod 7, the lower surface of the limiting ring 4 being horizontally butted with the lower surface of the guide ring 2 to increase the impact area of the plunger rod 7 sliding upward with the guide ring 2, a sliding rod 5 fixedly connected to the inner side wall of the cylinder 1 to limit the movement range of the bottom end of the plunger rod 7, the sliding rod 5 having four and being fixedly connected to the lower surface of the guide ring 2 to increase the limiting force, the sliding rod 5 having a triangular block 6 fixedly connected to the upper and lower ends of the sliding rod 5 to extrude the plunger rod 7 to the center shaft to increase the friction force of the plunger rod 7, so as to reduce the impact force of the plunger rod 7 with the guide ring 2 and the cylinder 1, the cylinder 1 being provided with an air valve 9 on the side surface to inflate the inside of the cylinder 1, the air valve 9 being communicated with a gas guide pipe 10 to guide the injected nitrogen into the inside of the cylinder 1, two exhaust pipes 11 being opened on the lower surface of the cylinder 1 to exhaust the nitrogen in the inside of the cylinder 1, the exhaust pipes 11 being communicated with the inside of the cylinder 1 to guide the nitrogen in the inside of the cylinder 1 into the inside of the exhaust pipes 11, a limiting column 12 being slidably connected to the bottom of the cylinder 1 to limit the movement range of a pressing plate 14 and a spring 13, the spring 13 being fixedly connected to the bottom of the cylinder 1 to enable the pressing plate 14 to descend with the increase of the nitrogen pressure in the inside of the cylinder 1, the spring 13 being fixedly connected to the pressing plate 14 at the end away from the bottom of the cylinder 1 to block the exhaust pipes 11 to prevent nitrogen leakage, the upper surface of the limiting column 12 being fixedly connected with the pressing plate 14 to enable the pressing plate 14 to only vertically displace, and the pressing plate 14 being slidably connected with the inner side wall of the cylinder 1 to enable the pressing plate 14 to normally rise and fall.

[0023] The plunger rod 7 increases the nitrogen pressure in the inside of the cylinder 1, the plunger rod 7 being arranged in the inside of the cylinder 1, the side surface of the plunger rod 7 being slidably connected with the sealing ring 3 and the limiting ring 4 to prevent nitrogen leakage and prevent the plunger rod 7 from being offset, the bottom end of the plunger rod 7 being slidably connected with the sliding rod 5 to limit the movement range of the bottom end of the plunger rod 7, a groove being opened at the position where the bottom end of the plunger rod 7 is in contact with the sliding rod 5, a dust cover 8 being slidably connected with the side surface of the plunger rod 7 to prevent dust or water from entering the inside of the cylinder 1, the upper surface of the sealing ring 3 being fixedly connected with the dust cover 8 to fix the dust cover 8, the dust cover 8 being conical, and a groove being opened on the side surface of the dust cover 8 to make dust or water slide down to prevent accumulation.

[0024] Working principle: when using the device, press the plunger rod 7, the plunger rod 7 is lowered, and the sealing ring 3 connected with it is prevented from leaking nitrogen, the guide ring 2, the limiting ring 4 and the slide rod 5 limit the activity range of the plunger rod 7, so that it can only be vertically displaced, prevent deviation, the bottom end of the plunger rod 7 is lowered until it is about to contact the bottom of the cylinder 1, the bottom end of the plunger rod 7 is in contact with the triangular block 6 at the lower end of the slide rod 5, which is extruded to the center axis direction of the plunger rod 7, so that the plunger rod 7 is subjected to friction force increase, slow down the plunger rod 7 speed and impact force on the bottom of the cylinder 1, reduce the damage to the cylinder 1, no longer press the plunger rod 7, the plunger rod 7 is extruded upward due to the nitrogen in the cylinder 1, the plunger rod 7 rises and is about to impact the guide ring 2, its side surface is in contact with the triangular block 6 at the upper end of the slide rod 5, which slows down again and reduces the impact force on the guide ring 2, reduces the damage of the plunger rod 7 and the guide ring 2, and reduces the vertical stress of the plunger rod 7, prevents the bottom end of the plunger rod 7 from breaking, when the nitrogen pressure in the cylinder 1 is too large, it will affect the use of the device, the nitrogen in the cylinder 1 will extrude the pressing plate 14 to make it resist the spring 13 force down, the pressing plate 14 is extruded by nitrogen to below the exhaust pipe 11, so that the exhaust pipe 11 is connected with the inside of the cylinder 1, the nitrogen is discharged from the device, reduces the pressure in the cylinder 1, prevents the device from being damaged, when the nitrogen in the device is insufficient to affect the use of the device, the device can be inflated through the air valve 9, the gas is injected into the cylinder 1 through the air guide pipe 10, and the inflation is completed.

[0025] The above embodiment of the present application is described in detail in combination with the drawings, but the present application is not limited to the above embodiment, and various changes can be made within the knowledge range of ordinary skilled in the art without departing from the purpose of the present application.

Claims

1. A nitrogen spring plunger rod protection structure, characterized in that, include: A cylinder (1) is provided with a guide ring (2) fixedly connected to the inner wall of the cylinder (1). A sealing ring (3) and a limiting ring (4) are fixedly connected to the side surface of the guide ring (2). A sliding rod (5) is fixedly connected to the inner wall of the cylinder (1). There are four sliding rods (5) and they are fixedly connected to the lower surface of the guide ring (2). Triangular blocks (6) are fixedly connected to the upper and lower ends of the sliding rod (5). A plunger rod (7) is disposed inside the cylinder (1). The side surface of the plunger rod (7) is slidably connected to the sealing ring (3) and the limiting ring (4). The bottom end of the plunger rod (7) is slidably connected to the slide rod (5). A dust cover (8) is slidably connected to the side surface of the plunger rod (7).

2. The nitrogen spring plunger rod protection structure according to claim 1, characterized in that, The limiting ring (4) is located directly below the sealing ring (3), and the lower surface of the limiting ring (4) is horizontally aligned with the lower surface of the guide ring (2).

3. The nitrogen spring plunger rod protection structure according to claim 1, characterized in that, A groove is provided at the bottom end of the plunger rod (7) where it contacts the slide rod (5), and the upper surface of the sealing ring (3) is fixedly connected to the dust cover (8).

4. The nitrogen spring plunger rod protection structure according to claim 1, characterized in that, The dust cover (8) is conical in shape, and the side surface of the dust cover (8) is provided with grooves.

5. The nitrogen spring plunger rod protection structure according to claim 1, characterized in that, A gas valve (9) is provided on the side surface of the cylinder (1), and the gas valve (9) is connected to a gas guide pipe (10).

6. The nitrogen spring plunger rod protection structure according to claim 1, characterized in that, Two exhaust pipes (11) are provided on the lower surface of the cylinder (1), and the exhaust pipes (11) are connected to the inside of the cylinder (1).

7. The nitrogen spring plunger rod protection structure according to claim 1, characterized in that, The bottom of the cylinder (1) is slidably connected to a limit post (12), and the bottom of the cylinder (1) is fixedly connected to a spring (13). The end of the spring (13) away from the bottom of the cylinder (1) is fixedly connected to a pressure plate (14).

8. The nitrogen spring plunger rod protection structure according to claim 7, characterized in that, The upper surface of the limiting post (12) is fixedly connected to the pressure plate (14), and the pressure plate (14) is slidably connected to the inner wall of the cylinder (1).

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