A cylinder body of an elongated oil cylinder

Abstract

The utility model relates to oil cylinder technical field especially relates to a cylinder body of slender oil cylinder, it includes cylinder and cylinder bottom, the inside of cylinder includes female thread connecting section and piston sliding section, female thread connecting section is located the bottom of cylinder and extends to the bottom end of cylinder, the diameter of female thread connecting section is greater than the diameter of piston sliding section, cylinder bottom is integral structure, it includes the top section, female thread connecting section and sealing section who connects and diameter reduces gradually in proper order, sealing section stretches into piston sliding section and is provided with static sealing ring between sealing section and piston sliding section, female thread connecting section is with female thread connecting section thread connection, and the top section is against the bottom end of cylinder, the top section is provided with the screw hole that penetrates, and the screw hole is screwed with the set screw, and the set screw is against the bottom end surface of cylinder, this kind of structure will not appear the oil leakage phenomenon caused by the weld fatigue fracture, makes the reliability of cylinder higher.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, and in particular to a cylinder body of a slender hydraulic cylinder. Background Technology

[0002] Hydraulic cylinders are core actuators in hydraulic systems, converting hydraulic energy into mechanical energy to output linear motion. They are widely used in hydraulic presses, construction machinery, machine tools, and other fields. A typical hydraulic cylinder consists of a cylinder body and a piston slidably connected within it. The cylinder body includes a cylinder barrel and a cylinder bottom connected to one end of the barrel, with the piston rod extending from the other end. Slender hydraulic cylinders are used in processes such as deep hole machining. However, current slender hydraulic cylinders suffer from the following problems: the cylinder bottom and cylinder barrel are connected by welding, and the seal between them relies on the weld. During operation, slender hydraulic cylinders are subjected to prolonged pressure and constant pressure changes, making the weld prone to fatigue and fracture. Weld failure leads to seal failure, causing oil leakage at the connection between the cylinder bottom and cylinder barrel, resulting in low reliability. This problem urgently needs to be solved. Utility Model Content

[0003] The purpose of this utility model is to provide a cylinder body for a slender hydraulic cylinder, which aims to solve the problem of oil leakage at the connection point caused by welding between the cylinder bottom and the cylinder barrel in the prior art.

[0004] To achieve the above objectives, this utility model provides a cylinder body for a slender hydraulic cylinder, comprising a cylinder barrel and a cylinder bottom. The cylinder barrel includes an internally threaded connecting section and a piston sliding section. The internally threaded connecting section is located at the bottom of the cylinder barrel and extends to the bottom end of the cylinder barrel. The piston sliding section is located in the middle of the cylinder barrel. The diameter of the internally threaded connecting section is larger than the diameter of the piston sliding section, and the internally threaded connecting section is provided with internal threads. The cylinder bottom is an integral structure, comprising a support section, an externally threaded connecting section, and a sealing section connected in sequence with progressively smaller diameters. The sealing section extends into the piston sliding section, and a static sealing ring is provided between the sealing section and the piston sliding section. The externally threaded connecting section is provided with external threads and is threadedly connected to the internally threaded connecting section. The outer diameter of the support section is larger than that of the internally threaded connecting section so that the support section abuts against the bottom end of the cylinder barrel. The support section is provided with a through-hole. The extension direction of the screw hole is parallel to the axis of the cylinder barrel. The screw hole connects to the bottom end face of the cylinder barrel, and a set screw is screwed into the screw hole, with the set screw abutting against the bottom end face of the cylinder barrel.

[0005] Furthermore, there are multiple sets of screw holes and matching set screws, with the multiple sets of screw holes and set screws evenly distributed around the circumference.

[0006] Furthermore, multiple recessed force-bearing holes are provided on the bottom surface of the top section.

[0007] Furthermore, the length of the internal thread connection section is greater than that of the external thread connection section, so that the abutment section can fit tightly against the bottom end face of the cylinder after the internal thread connection section and the external thread connection section are screwed together.

[0008] Furthermore, a mitered section is used to transition between the internal threaded connection section and the piston sliding section, and a static sealing ring is provided in the mitered section. A stepped structure is used to transition between the external threaded connection section and the sealing section, and the static sealing ring is squeezed between the stepped structure and the mitered section.

[0009] Furthermore, the sealing section is provided with two or more circumferential sealing grooves, and a static sealing ring is placed in the sealing groove, which is squeezed between the sealing section and the piston sliding section.

[0010] Furthermore, an oil supply hole is provided at the bottom of the cylinder, extending along its axial direction, and a connecting flange is welded to the front end of the cylinder barrel.

[0011] Furthermore, the length of the cylinder barrel is 7-10 times the diameter of the cylinder barrel, the length of the cylinder barrel is 18-20 times the length of the external thread connection section, and the length of the cylinder barrel is 30-40 times the length of the sealing section.

[0012] Furthermore, the cylinder diameter is 110-130mm, the cylinder length is 700-1000mm, the length of the external thread connection section is 40-60mm, and the length of the sealing section is 20-30mm.

[0013] This utility model provides a slender hydraulic cylinder body, in which the cylinder bottom is installed on the cylinder barrel via a threaded connection, and a static sealing ring is added to ensure no oil leakage at the cylinder bottom. The set screw prevents rotation of the cylinder bottom, ensuring relative fixation between the cylinder bottom and the cylinder barrel. This structural combination replaces the traditional welding connection method, achieving a better sealing effect. Furthermore, compared to existing technologies, this structure eliminates oil leakage caused by weld fatigue fracture, resulting in higher cylinder body reliability. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the cylinder body of the slender hydraulic cylinder of this utility model;

[0015] Figure 2 This is an exploded structural view of the cylinder body of the slender hydraulic cylinder of this utility model, taken from a cross-sectional view.

[0016] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0017] Figure 4 yes Figure 2 A magnified view of a section at point B.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Cylinder barrel; 11. Internal threaded connection section; 12. Piston sliding section; 13. Miter joint section; 14. Connecting flange; 2. Cylinder bottom; 21. Top section; 221. Threaded hole; 222. Force hole; 22. External threaded connection section; 23. Sealing section; 231. Sealing groove; 24. Set screw; 25. Stepped structure; 26. Oil supply hole; 3. Static sealing ring. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below.

[0021] In this embodiment, unless otherwise explicitly specified and limited, terms such as "set in," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or a connection through one or more intermediate media. Those skilled in the art can understand the specific meaning of these terms in this embodiment based on the specific circumstances. The directional terms appearing in this embodiment are for the purpose of better describing the characteristics of the features and the relationships between them. It should be understood that when the placement direction of this embodiment changes, the direction of the characteristics of the features and the relationships between them also changes accordingly. Therefore, directional terms do not constitute an absolute limitation on the characteristics of the features and the relationships between them in space, but only a relative limitation.

[0022] This utility model provides a cylinder body for a slender hydraulic cylinder, such as... Figures 1 to 4As shown, it includes a cylinder barrel 1 and a cylinder bottom 2. The interior of the cylinder barrel 1 includes an internally threaded connecting section 11 and a piston sliding section 12. The piston sliding section 12 is used to install the piston, and the piston rod extends from the front end of the cylinder barrel 1. The internally threaded connecting section 11 is located at the bottom of the cylinder barrel 1 and extends to the bottom end of the cylinder barrel 1. The piston sliding section 12 is located in the middle of the cylinder barrel 1. The diameter of the internally threaded connecting section 11 is larger than the diameter of the piston sliding section 12, and the internally threaded connecting section 11 is provided with internal threads. The cylinder bottom 2 is a one-piece structure, meaning that the various structural sections of the cylinder bottom 2 cannot be separated but are integrally formed. Such a structure is convenient to manufacture and has high structural strength. The cylinder bottom 2 includes a top section 21, an external threaded connection section 22, and a sealing section 23 connected in sequence with decreasing diameters. The sealing section 23 extends into the piston sliding section 12, and a static sealing ring 3 is provided between the sealing section 23 and the piston sliding section 12. The static sealing ring 3 is used to seal the space between the cylinder bottom 2 and the piston, which is used to fill hydraulic oil. The external threaded connection section 22 is provided with external threads and is threadedly connected to the internal threaded connection section 11. The outer diameter of the top section 21 is larger than that of the internal threaded connection section 11 so that the top section 21 abuts against the bottom end of the cylinder barrel 1. The top section 21 is provided with a through threaded hole 221. The extension direction of the threaded hole 221 is parallel to the axis of the cylinder barrel 1. The threaded hole 221 connects to the bottom end face of the cylinder barrel 1. A set screw 24 is screwed into the threaded hole 221, and the set screw 24 abuts against the bottom end face of the cylinder barrel 1.

[0023] Based on the above structural design, the cylinder bottom 2 of this slender hydraulic cylinder is installed on the cylinder barrel 1 by a threaded connection, and a static sealing ring 3 is added to ensure that the cylinder bottom 2 does not leak oil. The setting of the set screw 24 can prevent the cylinder bottom 2 from rotating, ensuring the relative fixation between the cylinder bottom 2 and the cylinder barrel 1. The above structure replaces the traditional welding connection method, but achieves a better sealing effect.

[0024] In this embodiment, multiple sets of screw holes 221 and matching set screws 24 are provided, with the multiple sets of screw holes 221 and set screws 24 evenly distributed around the circumference. This structure makes the relative fixation between the cylinder bottom 2 and the cylinder barrel 1 more secure.

[0025] In this embodiment, a plurality of concave force holes 222 are provided on the bottom surface of the abutment section 21. When installing the cylinder bottom 2, the force structure of the long strip tool is inserted into the force hole 222. By means of the lever principle, the cylinder bottom 2 can be turned more easily and more firmly.

[0026] In this embodiment, the length of the internal threaded connecting section 11 is greater than that of the external threaded connecting section 22, so that after the internal threaded connecting section 11 and the external threaded connecting section 22 are screwed together, the abutment section 21 can fit tightly against the bottom end face of the cylinder 1. Preferably, the internal threaded connecting section 11 and the piston sliding section 12 are transitioned by a beveled section 13, and a static sealing ring 3 is provided in the beveled section 13. The external threaded connecting section 22 and the sealing section 23 are transitioned by a stepped structure 25, and the static sealing ring 3 is squeezed between the stepped structure 25 and the beveled section 13. With the above structure, the static sealing ring 3 can be stably positioned, the static sealing ring 3 will not shift, and the static sealing ring 3 will also be compressed to undergo greater deformation, resulting in a better sealing effect.

[0027] In this embodiment, the sealing section 23 is provided with two or more circumferential sealing grooves 231, and a static sealing ring 3 is placed in the sealing groove 231. The static sealing ring 3 is pressed between the sealing section 23 and the piston sliding section 12. The sealing groove 231 is used to position the static sealing ring 3 and prevent the static sealing ring 3 fitted on the sealing section 23 from shifting.

[0028] In this embodiment, the cylinder bottom 2 is provided with an oil supply hole 26 that extends through it along its axial direction. The oil supply hole 26 is used to connect a pressure oil pipeline. A connecting flange 14 is welded to the front end of the cylinder barrel 1. The connecting flange 14 is used to connect the cylinder barrel to mechanical equipment.

[0029] In this embodiment, the length of cylinder 1 is 7-10 times its diameter, 18-20 times the length of the external threaded connection section 22, and 30-40 times the length of the sealing section 23. Preferably, the diameter of cylinder 1 is 110-130 mm, the length is 700-1000 mm, the length of the external threaded connection section 22 is 40-60 mm, and the length of the sealing section 23 is 20-30 mm. Testing has shown that the external threaded connection section 22 within the above-mentioned size range provides sufficient connection strength and ensures a long service life for the slender cylinder even under high hydraulic pressure. The sealing section 23 within the above-mentioned size range provides sufficient space to accommodate enough static sealing rings 3 without being excessively long and wasting manufacturing materials. The above-mentioned size range represents a preferred choice after comprehensively considering structural stability and production costs.

[0030] In summary, this type of slender hydraulic cylinder will not experience oil leakage due to weld fatigue fracture, thus making the cylinder more reliable.

[0031] Where there is no conflict, the above embodiments and features can be combined with each other.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the preferred technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of this utility model.

Claims

1. A cylinder body for a slender hydraulic cylinder, characterized in that: Includes cylinder barrel (1) and cylinder bottom (2); The interior of the cylinder (1) includes an internal threaded connection section (11) and a piston sliding section (12). The internal threaded connection section (11) is located at the bottom of the cylinder (1) and extends to the bottom end of the cylinder (1). The piston sliding section (12) is located in the middle of the cylinder (1). The diameter of the internal threaded connection section (11) is larger than the diameter of the piston sliding section (12). The internal threaded connection section (11) is provided with internal threads. The cylinder bottom (2) is an integral structure, which includes a top section (21), an external threaded connection section (22) and a sealing section (23) connected in sequence with decreasing diameters. The sealing section (23) extends into the piston sliding section (12) and a static sealing ring (3) is provided between the sealing section (23) and the piston sliding section (12). The external threaded connection section (22) is provided with external threads and is threadedly connected to the internal threaded connection section (11). The outer diameter of the top section (21) is larger than that of the internal threaded connection section (11) so that the top section (21) abuts against the bottom end of the cylinder barrel (1). The top section (21) is provided with a through screw hole (221). The extension direction of the screw hole (221) is parallel to the axis of the cylinder (1). The screw hole (221) is connected to the bottom end face of the cylinder (1). A set screw (24) is screwed into the screw hole (221). The set screw (24) abuts against the bottom end face of the cylinder (1).

2. The cylinder body of the slender hydraulic cylinder according to claim 1, characterized in that: Multiple sets of screw holes (221) and matching set screws (24) are provided, and the multiple sets of screw holes (221) and set screws (24) are evenly distributed around the circumference.

3. The cylinder body of the slender hydraulic cylinder according to claim 1, characterized in that: Multiple recessed force holes (222) are provided on the bottom surface of the top section (21).

4. The cylinder body of the slender hydraulic cylinder according to claim 1, characterized in that: The length of the internal threaded connection section (11) is greater than that of the external threaded connection section (22) so that the abutment section (21) can fit tightly against the bottom end face of the cylinder (1) after the internal threaded connection section (11) and the external threaded connection section (22) are screwed together.

5. The cylinder body of the slender hydraulic cylinder according to claim 4, characterized in that: The internal threaded connection section (11) and the piston sliding section (12) are connected by a mitered section (13), and a static sealing ring (3) is provided in the mitered section (13). The external threaded connection section (22) and the sealing section (23) are connected by a stepped structure (25), and the static sealing ring (3) is squeezed between the stepped structure (25) and the mitered section (13).

6. The cylinder body of the slender hydraulic cylinder according to claim 1, characterized in that: The sealing section (23) is provided with two or more circumferential sealing grooves (231), and a static sealing ring (3) is placed in the sealing groove (231). The static sealing ring (3) is squeezed between the sealing section (23) and the piston sliding section (12).

7. The cylinder body of the slender hydraulic cylinder according to claim 1, characterized in that: The bottom of the cylinder (2) is provided with an oil supply hole (26) that runs through it along its axial direction, and the front end of the cylinder barrel (1) is welded with a connecting flange (14).

8. The cylinder body of the elongated hydraulic cylinder according to any one of claims 1 to 7, characterized in that: The length of cylinder (1) is 7-10 times the diameter of cylinder (1), the length of cylinder (1) is 18-20 times the length of external thread connection section (22), and the length of cylinder (1) is 30-40 times the length of sealing section (23).

9. The cylinder body of the elongated hydraulic cylinder according to any one of claims 1 to 7, characterized in that: The diameter of the cylinder (1) is 110-130mm, the length of the cylinder (1) is 700-1000mm, the length of the external thread connection section (22) is 40-60mm, and the length of the sealing section (23) is 20-30mm.

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