High-sealing-performance hydraulic oil cylinder

Abstract

The utility model discloses a hydraulic oil cylinder with high sealing performance, which belongs to the technical field of hydraulic cylinders and comprises a base arranged at the bottom of a cylinder body, a top cover arranged at the top of the cylinder body, a hydraulic rod movably arranged in the middle of the top cover, and a piston mounted at the bottom of the hydraulic rod. An upper concave part and a lower concave part which are symmetrical are formed in the upper side and the lower side of the piston respectively; a trapezoidal cavity is formed in the middle of the top cover, a locking sleeve attached to the hydraulic rod is arranged in the middle of the trapezoidal cavity, a sealing cover is installed at the bottom of the trapezoidal cavity, multiple sets of extrusion blocks are movably arranged on the sealing cover, and the tops of the extrusion blocks are connected with the top of the trapezoidal cavity through reset springs; the top of the top cover is further provided with a scraping structure matched with the hydraulic rod. The hydraulic rod can be locked through the locking cavity when the hydraulic cylinder contracts, and the hydraulic rod can be locked through the locking sleeve when the hydraulic cylinder stretches out. During use, the scraping structure can repeatedly scrape the surface, impurities are prevented from adhering to the surface, and the stability and practicability are improved through the design.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a high-sealing hydraulic oil cylinder. Background Art

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy, producing linear reciprocating (or oscillating) motion. It features a simple structure and reliable operation. Reciprocating motion can be achieved without a reduction gear, and with zero transmission backlash, the cylinder offers smooth motion. Consequently, it is widely used in hydraulic systems across various machines. The cylinder's output force is proportional to the effective area of the piston and the pressure differential across it. A hydraulic cylinder essentially consists of a cylinder barrel and head, a piston and rod, a sealing device, a buffer, and an exhaust device. The buffer and exhaust devices are specific to the application, while other devices are essential.

[0003] The patent application with publication number CN221942870U discloses a sealed hydraulic cylinder, which relates to the technical field of hydraulic cylinders, including a cylinder body, a piston body movably embedded in the inner surface wall of the cylinder body, a piston rod fixedly connected to the top of the piston body, an outer sleeve fixedly sleeved on the outer wall of the piston rod, a group of first buffer springs fixedly connected to the bottom of the inner wall of the outer sleeve, an inner sleeve fixedly connected between the tops of a group of first buffer springs, an outer guide rod fixedly connected to the bottom of the piston body, a second buffer spring fixedly connected to the top of the inner wall of the outer guide rod, and an inner guide rod fixedly connected to the bottom of the second buffer spring. In this utility model, the rigid impact between the piston and the cylinder head can be effectively alleviated through the interaction of the various components of the equipment, thereby reducing the noise and vibration generated by the impact between the piston and the cylinder head, thereby enhancing the stability and service life of the hydraulic cylinder.

[0004] However, the aforementioned hydraulic cylinders have limited sealing capabilities, cannot achieve multiple locking functions on the hydraulic rod during use, are prone to danger when loaded, and can become clogged with debris after prolonged use. Therefore, in response to these current circumstances, there is an urgent need to develop a highly sealed hydraulic cylinder to overcome these shortcomings in current practical applications. Utility Model Content

[0005] The purpose of the utility model is to provide a high-sealing hydraulic cylinder in order to solve the problems of the existing hydraulic cylinder having general sealing ability, the inability to perform multiple locking of the hydraulic rod during use, the danger of being easily generated when the load is large, and a large amount of debris adhering to the surface of the hydraulic rod after long-term use.

[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is: a highly sealed hydraulic cylinder, comprising a cylinder body, a base provided at the bottom of the cylinder body, a top cover provided at the top of the cylinder body, a hydraulic rod movably provided in the middle of the top cover, and a piston installed at the bottom of the hydraulic rod; symmetrical upper and lower recessed portions are respectively provided on the upper and lower sides of the piston; a trapezoidal cavity is provided in the middle of the top cover, a locking sleeve that fits the hydraulic rod is provided in the middle of the trapezoidal cavity, a sealing cover is installed at the bottom of the trapezoidal cavity, a plurality of extrusion blocks movably provided on the sealing cover, and the top of the extrusion block is connected to the top of the trapezoidal cavity through a reset spring; a scraping structure that cooperates with the hydraulic rod is also installed on the top of the top cover.

[0007] As a further solution of the present invention: a lower inlet and outlet nozzle and an upper inlet and outlet nozzle are also provided on the cylinder body, a first pipe cooperating with the lower inlet and outlet nozzle is opened inside the piston, and the first pipe is communicated with the lower recessed portion; a second pipe cooperating with the upper inlet and outlet nozzle is opened inside the piston, and the second pipe is communicated with the upper recessed portion.

[0008] As a further solution of the present invention: the hydraulic rod protrudes from the piston, a locking cavity cooperating with the hydraulic rod is provided inside the base, and a rubber layer is further provided on the inner wall of the locking cavity.

[0009] As a further solution of the present invention: the scraping structure includes a scraping portion, and an annular collecting portion is provided around the scraping portion.

[0010] As a further solution of the present invention: a plurality of groups of upper sealing rings are provided on the inner wall of the scraping portion, and a plurality of groups of lower sealing rings are provided on the outer wall of the piston.

[0011] The present invention provides a high-sealing hydraulic cylinder through improvement. Compared with the prior art, the present invention has the following beneficial effects:

[0012] The utility model can lock the hydraulic rod through the locking cavity when the hydraulic cylinder is retracted, and the locking sleeve can lock the hydraulic rod when the hydraulic cylinder is extended. During use, the scraping structure can repeatedly scrape the surface of the hydraulic rod to prevent debris from sticking to the surface. This design greatly improves the stability and practicality of the high-sealing hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further explained below with reference to the accompanying drawings and embodiments:

[0014] Figure 1 It is a three-dimensional structural diagram of the utility model;

[0015] Figure 2 It is a cross-sectional view of the utility model;

[0016] Figure 3 This is a three-dimensional structural diagram of the piston in the utility model;

[0017] Figure 4 It is a diagram of the internal structure of the trapezoidal cavity in the present invention.

[0018] Description of reference numerals:

[0019] 1. Cylinder body; 2. Base; 3. Top cover; 4. Lower inlet and outlet nozzle; 5. Upper inlet and outlet nozzle; 6. Hydraulic rod; 7. Piston; 8. Locking chamber; 9. Rubber layer; 10. Upper recessed portion; 11. Lower recessed portion; 12. First pipe; 13. Second pipe; 14. Lower sealing ring; 15. Trapezoidal cavity; 16. Locking sleeve; 17. Sealing cover; 18. Extrusion block; 19. Return spring; 20. Scraping structure; 21. Scraping portion; 22. Collecting portion; 23. Upper sealing ring. DETAILED DESCRIPTION

[0020] The following will be combined with the Figures 1 to 4 The technical solution of the present invention is clearly and completely described. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0021] The utility model provides a high-sealing hydraulic cylinder through improvement. Figures 1-4 As shown, it includes a cylinder body 1, a base 2 is provided at the bottom of the cylinder body 1, a top cover 3 is provided at the top of the cylinder body 1, a hydraulic rod 6 is movably provided in the middle of the top cover 3, and a piston 7 is installed at the bottom of the hydraulic rod 6; symmetrical upper and lower recessed portions 10 and lower recessed portions 11 are respectively provided on the upper and lower sides of the piston 7; a trapezoidal cavity 15 is provided in the middle of the top cover 3, a locking sleeve 16 that fits with the hydraulic rod 6 is provided in the middle of the trapezoidal cavity 15, a sealing cover 17 is installed at the bottom of the trapezoidal cavity 15, and a plurality of groups of extrusion blocks 18 are movably provided on the sealing cover 17, and the top of the extrusion block 18 is connected to the top of the trapezoidal cavity 15 by a reset spring 19; a scraping structure 20 that cooperates with the hydraulic rod 6 is also installed on the top of the top cover 3.

[0022] The locking chamber 8 of the present invention can lock the hydraulic rod 6 when the hydraulic cylinder is retracted, and the locking sleeve 16 can lock the hydraulic rod 6 when the hydraulic cylinder is extended. During use, the scraping structure 20 can repeatedly scrape the surface of the hydraulic rod 6 to prevent debris from sticking to the surface. This design greatly improves the stability and practicality of the high-sealing hydraulic cylinder.

[0023] See attached Figure 2 -Attached Figure 3The cylinder body 1 is also provided with a lower inlet and outlet nozzle 4 and an upper inlet and outlet nozzle 5. A first pipe 12 cooperating with the lower inlet and outlet nozzle 4 is opened inside the piston 7, and the first pipe 12 is connected to the lower recessed portion 11; a second pipe 13 cooperating with the upper inlet and outlet nozzle 5 is opened inside the piston 7, and the second pipe 13 is connected to the upper recessed portion 10.

[0024] In this embodiment: when the hydraulic cylinder is retracted, hydraulic oil is injected into the barrel 1 through the upper inlet and outlet nozzles 5, and hydraulic oil is pumped out of the barrel 1 through the lower inlet and outlet nozzles 4. At this time, the hydraulic oil enters the barrel 1 through the second pipe 13 and the upper recessed portion 10. When the hydraulic cylinder is extended, hydraulic oil is pumped out through the upper inlet and outlet nozzles 5, and hydraulic oil is injected into the barrel 1 through the lower inlet and outlet nozzles 4. At this time, the hydraulic oil enters the barrel 1 through the first pipe 12 and the lower recessed portion 11. The design of the lower recessed portion 11 and the upper recessed portion 10 can improve the hydraulic efficiency and avoid the contact area being too small to facilitate lifting the piston 7.

[0025] See attached Figure 2 , the protruding piston 7 of the hydraulic rod 6, the interior of the base 2 is provided with a locking cavity 8 that cooperates with the hydraulic rod 6, and a rubber layer 9 is also provided on the inner wall of the locking cavity 8.

[0026] In this embodiment, in order to lock the hydraulic rod 6 when the hydraulic cylinder contracts, a locking chamber 8 is designed. In order to further increase the friction force, a rubber layer 9 is designed.

[0027] See attached Figure 1 -Attached Figure 2 The scraping structure 20 includes a scraping portion 21 , and an annular collecting portion 22 is provided around the scraping portion 21 .

[0028] In this embodiment, in order to avoid a large amount of debris sticking to the surface of the hydraulic rod 6 and affecting the operation when used in a poor environment or a place with strong oil pollution, a scraping portion 21 is designed. In order to collect the debris scraped off, a collecting portion 22 is designed.

[0029] See attached Figure 3 -Attached Figure 4 , multiple groups of upper sealing rings 23 are provided on the inner wall of the scraping portion 21 , and multiple groups of lower sealing rings 14 are provided on the outer wall of the piston 7 .

[0030] In this embodiment, in order to further improve the airtightness when the piston 7 reciprocates along the inner wall of the barrel 1, a lower sealing ring 14 is designed. When the hydraulic rod 6 reciprocates along the scraping structure 20, in order to further improve the airtightness, an upper sealing ring 23 is designed.

[0031] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and inventive features disclosed herein.

Claims

1. A high-sealing hydraulic cylinder, characterized by: The invention comprises a cylinder body (1), wherein a base (2) is provided at the bottom of the cylinder body (1), a top cover (3) is provided at the top of the cylinder body (1), a hydraulic rod (6) is movably provided in the middle of the top cover (3), and a piston (7) is installed at the bottom of the hydraulic rod (6); the upper and lower sides of the piston (7) are respectively provided with symmetrical upper concave parts (10) and lower concave parts (11); a trapezoidal cavity (15) is provided in the middle of the top cover (3), and the trapezoidal cavity (15) is provided in the middle of the top cover (3). A locking sleeve (16) is provided in the middle of the cavity (15) and is fitted with the hydraulic rod (6). A sealing cover (17) is installed at the bottom of the trapezoidal cavity (15). A plurality of extrusion blocks (18) are movably provided on the sealing cover (17). The top of the extrusion block (18) is connected to the top of the trapezoidal cavity (15) through a return spring (19); and a scraping structure (20) is also installed on the top of the top cover (3) and is fitted with the hydraulic rod (6).

2. A high-sealing hydraulic cylinder according to claim 1, characterized in that: The barrel (1) is further provided with a lower inlet and outlet nozzle (4) and an upper inlet and outlet nozzle (5); a first pipe (12) cooperating with the lower inlet and outlet nozzle (4) is provided inside the piston (7); the first pipe (12) is communicated with the lower recessed portion (11); a second pipe (13) cooperating with the upper inlet and outlet nozzle (5) is provided inside the piston (7); the second pipe (13) is communicated with the upper recessed portion (10).

3. The high-sealing hydraulic cylinder according to claim 1, characterized in that: The hydraulic rod (6) protrudes from the piston (7), and a locking cavity (8) cooperating with the hydraulic rod (6) is provided inside the base (2), and a rubber layer (9) is further provided on the inner wall of the locking cavity (8).

4. The high-sealing hydraulic cylinder according to claim 1, characterized in that: The scraping structure (20) comprises a scraping portion (21), and an annular collecting portion (22) is arranged around the scraping portion (21).

5. The high-sealing hydraulic cylinder according to claim 4, characterized in that: A plurality of groups of upper sealing rings (23) are provided on the inner wall of the scraping portion (21), and a plurality of groups of lower sealing rings (14) are provided on the outer wall of the piston (7).

Images