Hydraulic cylinder with protection structure

Abstract

The utility model discloses a kind of oil cylinders with protective structure, including oil cylinder main body, mobile piston, piston rod and cylinder cover, the outer end fixed mounting of oil cylinder main body has protective sleeve, the inner wall fixed mounting of oil cylinder main body has heat insulating layer;The lower positioning piece is fixedly installed on the upper end of the oil cylinder main body, the fastening ring is threadedly connected with the outer curved surface of the lower end of the lower positioning ring, the flexible bellow is extruded and adhered to the lower end of the fastening ring, the upper positioning piece is fixedly installed on the outer curved surface of the upper end of the piston rod, the positioning column is fixedly installed on the upper end of the upper positioning piece, the clamping piece is movably connected with the outer curved surface of the positioning column, the limiting ring is fixedly installed on the upper end of the positioning column, the supporting spring is fixedly installed on the lower end of the limiting ring, the flexible bellow upper end inside extrusion is adhered between the clamping piece and the upper positioning piece.The utility model greatly improves the protection performance of oil cylinder main body, prolongs the service life of oil cylinder main body.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, specifically to a cylinder with a protective structure. Background Technology

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy, performing linear reciprocating motion (or oscillating motion). It has a simple structure and reliable operation. When used to achieve reciprocating motion, it eliminates the need for a speed reduction device, has no transmission backlash, and provides smooth movement. Therefore, it is widely used in the hydraulic systems of various machines. A hydraulic cylinder generally consists of a cylinder barrel, cylinder head, piston, piston rod, sealing device, buffer device, and venting device. Its working principle is based on Pascal's law, which states that in a closed container, pressure applied to a stationary liquid is transmitted equally to all points in the liquid. When hydraulic oil is introduced into one chamber of the hydraulic cylinder, the piston generates a thrust or pull force under pressure, thereby driving the piston rod to perform linear reciprocating motion.

[0003] Among them, hydraulic cylinders, as key actuators in hydraulic systems, are widely used in various fields such as engineering machinery, metallurgical equipment, and shipbuilding.

[0004] However, in practical applications, existing technologies often pose various potential threats to traditional hydraulic cylinders due to the complex and varied working environment. For example, on construction sites, cylinders may be subjected to impacts from building materials and abrasion from sand and gravel; in metallurgical workshops, high temperatures and flying metal shavings can damage cylinders; and during outdoor operations, the erosion from rain and dust cannot be ignored. These external factors not only cause scratches and wear on the cylinder surface, affecting its appearance, but more importantly, they may damage the cylinder's sealing structure, leading to hydraulic oil leakage, which in turn affects the cylinder's normal operating performance, reduces equipment efficiency, and may even cause safety accidents. Utility Model Content

[0005] The purpose of this utility model is to provide a hydraulic cylinder with a protective structure to solve the problems mentioned in the background art, such as the impact of building materials and the wear of sand and gravel on construction sites; the damage caused by high temperature environment and splashing metal debris in metallurgical workshops; and the corrosion caused by rain and dust during outdoor operations. These external factors not only cause scratches and wear on the surface of the hydraulic cylinder, affecting its appearance quality, but more importantly, they may damage the sealing structure of the hydraulic cylinder, causing hydraulic oil leakage, thereby affecting the normal working performance of the hydraulic cylinder, reducing the working efficiency of the equipment, and even causing safety accidents.

[0006] To achieve the above objectives, this utility model provides the following technical solution: it includes a cylinder body, a movable piston, a piston rod, and a cylinder head. A protective sleeve is fixedly installed on the outer end of the cylinder body, and a heat insulation layer is fixedly installed on the inner wall of the cylinder body. A solution cavity is opened on the outer side of the inner end of the protective sleeve.

[0007] A lower positioning plate is fixedly installed on the upper end of the cylinder body. A fastening ring is threadedly connected to the outer curved surface of the lower positioning ring. A telescopic bellows is pressed against the lower end of the fastening ring. An upper positioning plate is fixedly installed on the outer curved surface of the upper end of the piston rod. A positioning post is fixedly installed on the upper end of the upper positioning plate. A clamping plate is movably connected to the outer curved surface of the positioning post. A limit ring is fixedly installed on the top of the positioning post. A support spring is fixedly installed on the lower end of the limit ring. The inner side of the upper end of the telescopic bellows is pressed against the clamping plate and the upper positioning plate.

[0008] Preferably, the cylinder body is a cylindrical body, and a movable piston is movably connected inside the cylinder body. The upper end of the movable piston is fixedly connected to the bottom of the piston rod, and the cylinder head is installed at both ends of the cylinder body.

[0009] Preferably, the protective sleeve is made of high-strength material, the outer end of the protective sleeve is coated with a wear-resistant coating, and the heat insulation layer is made of heat insulation material.

[0010] Preferably, the solution chamber is filled with liquid pigment, and a supporting steel column is fixedly installed at the lower end of the cylinder body.

[0011] Preferably, the upper end of the lower positioning piece is fixedly installed with a lower positioning ring whose outer curved surface has an external thread, and the lower end of the fastening ring has anti-slip stripes.

[0012] Preferably, the telescopic corrugated tube is made of flexible rubber, and there are several positioning posts, which are symmetrically distributed sequentially around the upper end of the upper positioning plate.

[0013] Preferably, the lower end of the clamping piece is provided with anti-slip stripes, and the lower end of the support spring is fixedly installed on the upper end of the clamping piece, and the support spring is in a compressed state.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This utility model protects the outer end of the cylinder body with a protective sleeve. The protective sleeve has excellent impact resistance and wear resistance. Its wear-resistant coating further enhances the protective sleeve's ability to resist impact and wear from external objects. The heat insulation layer can effectively prevent the external high-temperature environment from transferring heat to the cylinder body, reduce the temperature of the hydraulic oil inside the cylinder body, and ensure the normal operation performance of the cylinder body in high-temperature environments. At the same time, the heat insulation layer can also play a certain buffering role, reducing the impact of external impact on the cylinder body. When the protective sleeve is damaged by external force or corrosion, the solution cavity opened on the outer side of the inner end of the protective sleeve will be damaged and cracked. When the solution cavity is damaged and cracked, the liquid pigment filled inside the solution cavity will flow out to the outer end of the protective sleeve. The liquid pigment flowing out to the outer end of the protective sleeve can promptly indicate that the protective sleeve is damaged, thereby achieving the function of facilitating the protection of the cylinder body.

[0016] This invention also features a reciprocating bellows that moves along the axial direction of the cylinder body when the piston rod reciprocates linearly. The bellows effectively shields and protects the upper part of the cylinder body, preventing dust, rainwater, and other impurities from entering the cylinder body. This reduces the risk of wear and hydraulic oil leakage caused by impurities, significantly improves the protective performance of the cylinder body, and extends its service life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a hydraulic cylinder with a protective structure according to the present invention;

[0018] Figure 2 This is a cross-sectional schematic diagram of the overall structure of a hydraulic cylinder with a protective structure according to the present invention;

[0019] Figure 3 This is a partial cross-sectional view of a hydraulic cylinder with a protective structure according to the present invention.

[0020] In the diagram: 1. Cylinder body; 2. Moving piston; 3. Piston rod; 4. Cylinder head; 5. Protective sleeve; 6. Heat insulation layer; 7. Solution chamber; 8. Supporting steel column; 9. Lower positioning plate; 10. Lower positioning ring; 11. Telescopic bellows; 12. Upper positioning plate; 13. Positioning post; 14. Clamping plate; 15. Limiting ring; 16. Supporting spring; 17. Fastening ring. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-3 This utility model provides a hydraulic cylinder technical solution with a protective structure: it includes a hydraulic cylinder body 1, a movable piston 2, a piston rod 3 and a cylinder head 4. The hydraulic cylinder body 1 is a cylindrical body, and the movable piston 2 is movably connected inside it. The upper end of the movable piston 2 is fixedly connected to the bottom of the piston rod 3. The piston rod 3 can reciprocate linearly along the axial direction of the hydraulic cylinder body 1. The cylinder head 4 is installed at both ends of the hydraulic cylinder body 1 to seal the hydraulic cylinder body 1 and guide the movement of the piston rod 3.

[0023] A protective sleeve 5 is fixedly installed on the outer end of the cylinder body 1. The protective sleeve 5 is made of high-strength material and has a wear-resistant coating sprayed on its outer end. The wear-resistant coating further enhances the protection of the outer end of the cylinder body 1. A heat insulation layer 6 is fixedly installed on the inner wall of the cylinder body 1. The heat insulation layer 6 is made of heat insulation material. The heat insulation layer 6 prevents the external high-temperature environment from transferring heat to the cylinder body 1, reduces the temperature of the hydraulic oil inside the cylinder body 1, and ensures the normal working performance of the cylinder body 1 in high-temperature environment. At the same time, the heat insulation layer 6 can also play a certain buffering role to reduce the impact of external impact on the cylinder body 1. A solution cavity 7 is opened on the outer side of the inner end of the protective sleeve 5. The solution cavity 7 is filled with liquid pigment. A support steel column 8 is fixedly installed on the lower end of the cylinder body 1. The support steel column 8 further supports and protects the lower end of the cylinder body 1.

[0024] A lower positioning plate 9 is fixedly installed on the upper end of the cylinder body 1. A lower positioning ring 10 with external threads is fixedly installed on the upper end of the lower positioning plate 9. A fastening ring 17 is threaded to the lower end of the lower positioning ring 10, and anti-slip stripes are provided on the lower end of the fastening ring 17. A telescopic bellows 11 made of flexible rubber is pressed and fitted onto the lower end of the fastening ring 17. An upper positioning plate 12 is fixedly installed on the upper outer curved surface of the piston rod 3. A positioning pin 13 is fixedly installed on the upper end of the upper positioning plate 12. There are several positioning pins 13, which are respectively positioned on the upper positioning plate 12. The ends are symmetrically distributed. The outer curved surface of the positioning post 13 is movably connected to the clamping piece 14, and the lower end of the clamping piece 14 is provided with anti-slip stripes. The top end of the positioning post 13 is fixedly installed with a limit ring 15, and the lower end of the limit ring 15 is fixedly installed with a support spring 16. The lower end of the support spring 16 is fixedly installed on the upper end of the clamping piece 14. The support spring 16 is in a compressed state, and the inner side of the upper end of the telescopic corrugated tube 11 is pressed and adhered between the clamping piece 14 and the upper positioning piece 12, so that the inner side of the upper end of the telescopic corrugated tube 11 is pressed and positioned by the support spring 16 in conjunction with the clamping piece 14.

[0025] Working principle: In use, this utility model protects the outer end of the cylinder body 1 through the protective sleeve 5. The protective sleeve 5 has excellent impact resistance and wear resistance. The wear-resistant coating on its surface further enhances the protective sleeve 5's ability to resist impact and wear from external objects. The heat insulation layer 6 can effectively prevent the external high temperature environment from transferring heat to the cylinder body 1, reduce the temperature of the hydraulic oil inside the cylinder body 1, and ensure the normal working performance of the cylinder body 1 in high temperature environment. At the same time, the heat insulation layer 6 can also play a certain buffering role, reducing the impact of external impact on the cylinder body 1. When the protective sleeve 5 is damaged by external force or corrosion, the solution cavity 7 opened on the outer side of the inner end of the protective sleeve 5 will be damaged and cracked. When the solution cavity 7 is damaged and cracked, the liquid pigment filled in the solution cavity 7 will flow out to the outer end of the protective sleeve 5. The liquid pigment flowing out to the outer end of the protective sleeve 5 can promptly indicate that the protective sleeve 5 is damaged, thereby achieving the function of facilitating the protection of the cylinder body 1.

[0026] Simultaneously, when the piston rod 3 reciprocates linearly along the axial direction of the cylinder body 1, the upper end of the telescopic bellows 11 will follow the piston rod 3 in reciprocating linear motion. This allows the telescopic bellows 11 to shield and protect the upper end of the cylinder body 1, effectively preventing dust, rainwater, and other impurities from entering the cylinder body 1 through the upper end. This reduces the risk of wear and hydraulic oil leakage caused by impurities inside the cylinder body 1. Furthermore, when the telescopic bellows 11 needs to be replaced, pulling the clamping plate 14 upwards will push the compression support spring 16, simultaneously releasing the pressure on the inner side of the upper end of the telescopic bellows 11. Positioning: When the compression positioning of the inner side of the upper end of the telescopic bellows 11 is released, the fastening ring 17 is rotated through the inner side of the lower end of the telescopic bellows 11. When the fastening ring 17 rotates, it will move upward due to the force generated by the threaded connection with the outer curved surface of the lower end of the lower positioning ring 10. When the fastening ring 17 moves upward, the compression of the inner side of the lower end of the telescopic bellows 11 will be released. When the compression of the inner side of the lower end of the telescopic bellows 11 is released, it is easy to move the telescopic bellows 11 upward out of the piston rod 3 for maintenance and replacement, thereby achieving all-round protection of the cylinder body 1, greatly improving the protection performance of the cylinder body 1, and extending the service life of the cylinder body 1.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydraulic cylinder with a protective structure, characterized in that: The cylinder body (1), moving piston (2), piston rod (3), cylinder head (4), and lower positioning ring (10) are included. A protective sleeve (5) is fixedly installed on the outer end of the cylinder body (1), and a heat insulation layer (6) is fixedly installed on the inner wall of the cylinder body (1). A solution cavity (7) is opened on the outer side of the inner end of the protective sleeve (5). The upper end of the cylinder body (1) is fixedly installed with a lower positioning plate (9), the lower end of the lower positioning ring (10) is threaded with a fastening ring (17), the lower end of the fastening ring (17) is pressed against a telescopic bellows (11), the upper end of the piston rod (3) is fixedly installed with an upper positioning plate (12), the upper end of the upper positioning plate (12) is fixedly installed with a positioning post (13), the outer curved surface of the positioning post (13) is movably connected with a clamping plate (14), the top end of the positioning post (13) is fixedly installed with a limit ring (15), the lower end of the limit ring (15) is fixedly installed with a support spring (16), the inner side of the upper end of the telescopic bellows (11) is pressed against the clamping plate (14) and the upper positioning plate (12).

2. The hydraulic cylinder with a protective structure according to claim 1, characterized in that: The cylinder body (1) is a cylindrical body. A movable piston (2) is attached to the inside of the cylinder body (1). The upper end of the movable piston (2) is fixedly connected to the bottom of the piston rod (3). The cylinder cover (4) is installed at both ends of the cylinder body (1).

3. A hydraulic cylinder with a protective structure according to claim 2, characterized in that: The protective sleeve (5) is made of high-strength material, and the outer end of the protective sleeve (5) is coated with a wear-resistant coating. The heat insulation layer (6) is made of heat insulation material.

4. A hydraulic cylinder with a protective structure according to claim 3, characterized in that: The solution chamber (7) is filled with liquid pigment, and a supporting steel column (8) is fixedly installed at the lower end of the cylinder body (1).

5. A hydraulic cylinder with a protective structure according to claim 4, characterized in that: The lower positioning piece (9) has a lower positioning ring (10) fixedly installed on its upper end. The outer curved surface of the ring (10) has an external thread. The lower end of the fastening ring (17) has anti-slip stripes.

6. A hydraulic cylinder with a protective structure according to claim 5, characterized in that: The telescopic corrugated pipe (11) is made of flexible rubber, and there are several positioning posts (13), which are symmetrically distributed at the upper end of the upper positioning piece (12).

7. A hydraulic cylinder with a protective structure according to claim 6, characterized in that: The clamping plate (14) has anti-slip stripes at its lower end, and the lower end of the support spring (16) is fixedly installed on the upper end of the clamping plate (14). The support spring (16) is in a compressed state.

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