A cylinder with piston guidance

Abstract

The utility model discloses a cylinder with piston guide, including cylinder barrel, the front, rear end of cylinder barrel is fixed with the rod side front end cover and the rodless side rear end cover respectively, four draw bars, the draw bar is parallel to cylinder barrel axis and annularly distributes, and two ends are respectively with the rod side front end cover and the rodless side rear end cover fastening connection, the piston rod, the piston rod can be sealed through the rod side front end cover and extends into the cylinder barrel axially sliding, the moving plug, the moving plug is fixed in the piston rod extension end and will in the cylinder barrel, the guide rod, the guide rod is fixed in the rodless side rear end cover with the piston rod parallelly and extends along the axial to the rod side front end cover, the guide rod slides through the moving plug, to the reciprocating motion of moving plug is guided. The elastic member of guide rod front end sleeve is compressed in advance when moving plug approaches the rod side front end cover, forms the progressive type damping, converts high -speed impact kinetic energy into elastic potential energy, avoids the rigid impact of moving plug and end cover.

Description

Technical Field

[0001] This utility model specifically relates to a cylinder with piston guidance. Background Technology

[0002] Traditional cylinders generally consist of a cylinder barrel, a front cover, a rear cover, a piston, a piston rod, and a buffer device. Driven by compressed air, the piston drives the piston rod in a reciprocating motion. At the end of the stroke, the piston needs to absorb the impact kinetic energy generated by the high-speed motion to prevent the piston from directly colliding with the end cover, which could cause noise, wear, or even structural damage.

[0003] In existing technologies, the most common cushioning method is to install a buffer sleeve (buffer pad) made of polyurethane or rubber on the inside of the front cover. When the piston approaches the end of its stroke, the piston end face contacts the buffer sleeve first, and the impact energy is absorbed through the elastic deformation of the buffer sleeve. However, the buffer sleeve occupies axial space after installation, resulting in an increase in the overall length of the cylinder, which is not conducive to the compact design of the equipment. Utility Model Content

[0004] The purpose of this invention is to provide a cylinder with piston guidance to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a cylinder with piston guidance, comprising a cylinder barrel, wherein a rod-side front end cap and a rodless-side rear end cap are respectively fixed to the front and rear ends of the cylinder barrel; Four tie rods are arranged in a ring parallel to the cylinder axis and evenly distributed around it. Their two ends are respectively fastened to the front end cover on the rod side and the rear end cover on the rodless side. A piston rod that can be axially slidably sealed through a rod-side end cap and extends into the cylinder; The movable plug is fixed to the piston rod extension end and enters the cylinder. A guide rod is fixed parallel to the piston rod on the rodless side rear end cover and extends axially toward the rod side front end cover. The guide rod slides through the movable plug to guide the reciprocating motion of the movable plug.

[0006] Preferably, it also includes an elastic element, which is sleeved on the end of the guide rod facing the front end cover on the rod side. When the moving plug approaches the front end cover on the rod side, the moving plug first contacts the elastic element and compresses the elastic element to absorb the impact kinetic energy and prevent the moving plug from directly colliding with the front end cover on the rod side.

[0007] Preferably, the guide rod is arranged symmetrically with respect to the cylinder axis, and the movable plug has a through hole that slides with the guide rod.

[0008] Preferably, the elastic element is a compression spring, and the outer diameter of the compression spring is smaller than the diameter of the through hole on the movable plug.

[0009] Preferably, the end of the guide rod facing the front end cover on the rod side is provided with a limiting boss, and the outer diameter of the limiting boss is larger than the outer diameter of the elastic element.

[0010] Preferably, the end face of the rod-side front end cap facing the inner cavity of the cylinder is provided with a countersunk hole corresponding to the end of the elastic element.

[0011] Preferably, the outer peripheral wall of the movable plug is fitted with at least one sealing ring and at least one wear-resistant ring.

[0012] The technical effects and advantages of this utility model are as follows: The elastic element of the guide rod front end is pre-compressed when the moving piston approaches the front end cover of the rod side, forming progressive damping, which converts the high-speed impact kinetic energy into elastic potential energy, avoids rigid impact between the moving piston and the end cover, extends the service life of the piston, and reduces the axial space occupied by eliminating the buffer sleeve, so that the overall length of the cylinder does not need to be increased. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the sealing ring of this utility model; Figure 3 This is a schematic diagram of the guide rod of this utility model; Figure 4 This utility model Figure 3 A magnified structural diagram of point A in the middle.

[0014] In the diagram: 1. Cylinder; 2. Front end cap on the rod side; 3. Rear end cap on the rodless side; 4. Tie rod; 5. Piston rod; 6. Moving plug; 7. Guide rod; 8. Elastic element; 9. Limiting boss; 10. Countersunk hole; 11. Sealing ring; 12. Wear ring. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0016] refer to Figure 1 , Figure 2 and Figure 3As shown, the cylinder includes a cylinder 1, with a rod-side front end cover 2 and a rodless-side rear end cover 3 fixed to its front and rear ends, respectively; four tie rods 4, which are parallel to the axis of the cylinder 1 and evenly distributed in a ring, with their ends fastened to the rod-side front end cover and the rodless-side rear end cover 3, respectively; and a piston rod 5, which can axially slide and seal through the rod-side front end cover and extend into the cylinder 1. The movable plug 6 is fixed to the insertion end of the piston rod 5 and inside the cylinder 1. The guide rod 7 is fixed parallel to the piston rod 5 to the rodless side rear end cover 3 and extends axially towards the rod side front end cover. The guide rod 7 slides through the movable plug 6 to guide the reciprocating motion of the movable plug 6. The elastic element 8 fitted at the front end of the guide rod 7 is pre-compressed when the movable plug 6 approaches the rod side front end cover, forming progressive damping, which converts the high-speed impact kinetic energy into elastic potential energy, avoids rigid impact between the movable plug 6 and the end cover, and extends the service life of the piston. After eliminating the buffer sleeve, the axial space occupied is reduced, so that the overall length of the cylinder does not need to be increased. The guide rod 7 is symmetrically arranged with respect to the axis of the cylinder 1. The movable plug 6 obtains a balanced lateral constraint force in both directions of the stroke, effectively suppressing the sag of the piston rod 5 and the crawling and shaking caused by the off-center load.

[0017] refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, it also includes an elastic element 8, which is sleeved on the end of the guide rod 7 facing the rod-side front end cover. When the movable plug 6 approaches the rod-side front end cover, the movable plug 6 first contacts and compresses the elastic element 8 to absorb impact kinetic energy and prevent the movable plug 6 from directly colliding with the rod-side front end cover. The guide rod 7 is symmetrically arranged with respect to the axis of the cylinder 1, and the movable plug 6 has a through hole that slides with the guide rod 7. The guide rod 7 not only provides lateral support and anti-deflection function for the movable plug 6, but also serves as the positioning and guiding spindle for the elastic element 8, serving two purposes without occupying additional axial space in the cylinder 1; compared with a traditional cylinder of the same stroke, the total length can be shortened. The elastic element 8 is a compression spring, and the outer diameter of the compression spring is smaller than the diameter of the through hole on the movable plug 6. The guide rod 7 has a limiting boss 9 at its end facing the front end cap on the rod side. The outer diameter of the limiting boss 9 is larger than the outer diameter of the elastic element 8. The end face of the front end cap facing the inner cavity of the cylinder 1 has a countersunk hole 10 corresponding to the end of the elastic element 8. The outer diameter of the compression spring is smaller than the diameter of the through hole of the moving plug 6. It is confined within the annular cavity formed by the guide rod 7 and the through hole throughout its entire length, and will not fly out or get stuck in the air passage. The limiting boss 9 at the end of the guide rod 7 and the countersunk hole 10 at the front end cap provide double limiting, preventing the spring from being over-compressed and unstable, and ensuring long-term reliable operation. At least one sealing ring 11 and at least one wear-resistant ring 12 are embedded on the outer peripheral wall of the moving plug 6. The guide rod 7 and the rear end cap are fastened with threads, and the elastic element 8 can be directly fitted in without adjusting the preload. The sealing ring 11 and the wear-resistant ring 12 use the existing standard groove type.

[0018] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model.

Claims

1. A cylinder with piston guidance, characterized in that, Includes a cylinder (1), with a rod-side front end cap (2) and a rodless side rear end cap (3) fixed to the front and rear ends of the cylinder (1), respectively. Four tie rods (4) are parallel to the axis of the cylinder (1) and are evenly distributed in a ring. The two ends are respectively fastened to the front end cover on the rod side and the rear end cover on the rodless side (3); Piston rod (5), which is axially slidably sealed through the rod-side front end cover and extends into the cylinder (1); The movable plug (6) is fixed to the piston rod (5) at the insertion end and enters the cylinder (1). The guide rod (7) is fixed parallel to the piston rod (5) on the rodless side rear end cover (3) and extends axially toward the rod side front end cover. The guide rod (7) slides through the movable plug (6) to guide the reciprocating motion of the movable plug (6).

2. The cylinder with piston guidance according to claim 1, characterized in that: It also includes an elastic element (8), which is sleeved on one end of the guide rod (7) facing the front end cover of the rod side. When the moving plug (6) approaches the front end cover of the rod side, the moving plug (6) first contacts the elastic element (8) and compresses the elastic element (8) to absorb the impact kinetic energy and prevent the moving plug (6) from directly colliding with the front end cover of the rod side.

3. The cylinder with piston guidance according to claim 1, characterized in that: The guide rod (7) is arranged symmetrically with respect to the axis of the cylinder (1), and the movable plug (6) has a through hole that slides with the guide rod (7).

4. The cylinder with piston guidance according to claim 2, characterized in that: The elastic element (8) is a compression spring, and the outer diameter of the compression spring is smaller than the diameter of the through hole on the movable plug (6).

5. The cylinder with piston guidance according to claim 4, characterized in that: The guide rod (7) has a limiting boss (9) at the end facing the front end cover on the rod side. The outer diameter of the limiting boss (9) is larger than the outer diameter of the elastic element (8).

6. The cylinder with piston guidance according to claim 5, characterized in that: The end face of the rod-side front end cap facing the inner cavity of the cylinder (1) is provided with a countersunk hole (10) corresponding to the end of the elastic element (8).

7. The cylinder with piston guidance according to claim 1, characterized in that: The outer peripheral wall of the movable plug (6) is fitted with at least one sealing ring (11) and at least one wear-resistant ring (12).

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