Hydraulic cylinder

Abstract

The hydraulic cylinder comprises a guide sleeve and a cylinder barrel, an anti-loosening groove is formed in the outer circle of the cylinder barrel, an anti-loosening piece matched with the anti-loosening groove is arranged in the anti-loosening groove, a tightening process groove is milled in the outer circle of an end cover of the guide sleeve, and the tightening process groove is matched with the anti-loosening piece. A containing groove used for containing a waterproof O-shaped ring is formed in the connecting position of the outer circle of an end cover of the guide sleeve and a sleeve body of the guide sleeve. The tightening process groove comprises a first-stage table and a second-stage groove, the first-stage table and the second-stage groove are in a step type, the second-stage groove is sealed by a convex part, extending at the tightening process groove, of the anti-loosening piece, and the height of the first-stage table is larger than the width of the waterproof O-shaped ring. The technical problem that in the prior art, a waterproof O-shaped ring of a guide sleeve cannot be completely covered, so that the exposed part of the waterproof O-shaped ring is prone to being extruded out and losing efficacy can be solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic cylinders and relates to a hydraulic cylinder. Background Art

[0002] At present, the guide sleeve and the cylinder barrel on the hydraulic cylinder are generally connected by an integral thread, and a waterproof O-ring is installed at the fitting position between the guide sleeve end cover and the cylinder barrel end face. The guide sleeve end cover is processed with a tightening process groove. However, the outer circle of the guide sleeve end cover is relatively close to the bottom of the guide sleeve waterproof O-ring groove. Since the tightening process groove is milled on the outer circle of the guide sleeve end cover, the milling groove position cannot completely cover the waterproof O-ring of the guide sleeve. The leaked part of the waterproof O-ring is easily squeezed out and becomes ineffective. Therefore, a hydraulic cylinder is urgently needed to solve the above technical problems. Utility Model Content

[0003] The utility model aims to overcome the deficiencies in the prior art and to provide a hydraulic cylinder which can solve the technical problem in the prior art that the waterproof O-ring cannot completely cover the guide sleeve, so that the leaked part of the waterproof O-ring is easily squeezed out and becomes ineffective.

[0004] In order to alleviate the above technical problems, the utility model is implemented by adopting the following technical solutions:

[0005] In a first aspect, the utility model provides a hydraulic cylinder, comprising a guide sleeve and a cylinder barrel, wherein an anti-loosening groove is provided on the outer circumference of the cylinder barrel, and an anti-loosening member adapted thereto is arranged in the anti-loosening groove, a tightening process groove is milled on the outer circumference of the end cover of the guide sleeve, and an accommodating groove for accommodating a waterproof O-ring is provided at the connection between the outer circumference of the end cover of the guide sleeve and the sleeve body of the guide sleeve;

[0006] The tightening process groove includes a primary platform and a secondary groove, the primary platform and the secondary groove are stepped, the convex portion of the anti-loosening component extending from the tightening process groove seals the secondary groove, and the height of the primary platform is greater than the width of the waterproof O-ring.

[0007] Furthermore, the material of the anti-loosening part is No. 45 steel plate.

[0008] Furthermore, the outer diameter of the end cover of the guide sleeve is larger than the diameter of the sleeve body.

[0009] Furthermore, an external thread matching the internal thread of the inner hole of the cylinder is arranged on the outer circle of the guide sleeve.

[0010] Furthermore, it also includes a piston rod, and the inner hole of the guide sleeve is matched and connected with the outer circle of the piston rod.

[0011] Furthermore, it also includes a dynamic seal integrated on the piston rod and a static seal integrated on the cylinder barrel.

[0012] Furthermore, the guide sleeve is made of round steel.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The inner hole of the cylinder end face is processed with a thread that cooperates with the outer circle of the guide sleeve, and the outer circle of the cylinder is processed with an anti-loosening groove. After the product passes the pressure test, the convex part of the anti-loosening part extending at the tightening process groove seals the secondary groove, and the height of the first-level platform is greater than the width of the waterproof O-ring. With the joint action of the first-level platform, the secondary groove, the convex part of the anti-loosening part and the end cover of the guide sleeve, the waterproof O-ring is covered and limited, so that the waterproof O-ring will not be squeezed out and fail, thereby increasing the service life of the waterproof O-ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a hydraulic cylinder provided in Example 1 of the present application.

[0016] Figure 2 It is a side view of the hydraulic cylinder provided in Example 1 of the present application.

[0017] Figure 3 It is a structural schematic diagram of the hydraulic cylinder provided in Example 1 of the present application.

[0018] Figure 4 This is a connection diagram of the hydraulic cylinder provided in Example 1 of the present application.

[0019] Among them, 1. guide sleeve; 101. end cover; 102. tightening process groove; 103. receiving groove; 104. sleeve body; 105. primary platform; 106. secondary groove; 2. cylinder barrel; 201. anti-loosening groove; 202. anti-loosening part; 203. convex part; 3. waterproof O-ring; 4. piston rod; 5. static seal; 6. dynamic seal. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the protection scope of the utility model.

[0021] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances. Example

[0023] like Figures 1 to 4 As shown, this embodiment provides a hydraulic cylinder, including a guide sleeve 1 and a cylinder barrel 2, wherein the guide sleeve 1 is processed by round steel or seamless pipe, and the cylinder barrel 2 is processed by cold-drawn pipe, and an external thread matching the internal thread of the inner hole of the cylinder barrel 2 is arranged on the outer circle of the sleeve body 104 of the guide sleeve 1, and an anti-loosening groove 201 is provided on the outer circle of the cylinder barrel 2, and an anti-loosening member 202 matched therewith is arranged in the anti-loosening groove 201, and a tightening process groove 102 is milled on the outer circle of the end cover 101 of the guide sleeve 1, and a receiving groove 103 for receiving a waterproof O-ring 3 is provided at the connection between the outer circle of the end cover 101 of the guide sleeve 1 and the sleeve body 104 of the guide sleeve 1, and the waterproof O-ring 3 is sleeved in the receiving groove 103;

[0024] The tightening process groove 102 includes a primary platform 105 and a secondary groove 106, and the primary platform 105 and the secondary groove 106 are stepped. The convex portion 203 of the anti-loosening member 202 extending from the tightening process groove 102 seals the secondary groove 106. Regarding the shape of the secondary groove 106, it can be a U-shaped groove, which is approximately close to the shape of the convex portion 203. The step between the primary platform 105 and the secondary groove 106 limits the anti-loosening member 202 from further extending into the tightening process groove 102. The height of the primary platform 105 is greater than the width of the waterproof O-ring 3. The displacement of the waterproof O-ring 3 is limited by the primary platform 105, so that the waterproof O-ring 3 can only produce slight movement in the accommodating groove 103. The outer diameter of the end cover 101 of the guide sleeve 1 is greater than the diameter of the sleeve body 104, thereby ensuring the overall sealing.

[0025] Among them, the material of the anti-loosening part 202 is 45# steel plate, which is widely used in machinery. Before heat treatment: HB≤229; heat treatment: normalizing; impact energy: Aku≥39J; high strength, good plasticity and toughness. After quenching and before tempering, the hardness of 45# steel plate is greater than HRC55 (up to HRC62) to be qualified. After heat treatment and tempering, it can reach HRC42-46, which can not only ensure its good mechanical properties, but also meet the surface hardness requirements. It is used to make small-section quenched and tempered parts with heavy loads and large normalized parts with small stress, as well as surface quenched parts with low requirements on core strength, such as pins, guide columns, needles and other parts.

[0026] It also includes a piston rod 4, and the inner hole of the guide sleeve 1 is matched and connected with the outer circle of the piston rod 4;

[0027] It also includes a dynamic seal 6 integrated on the piston rod 4 and a static seal 5 integrated on the cylinder 2. Regarding the static seal 5: the seal without relative motion between the two coupling parts of the sealed part is called a static seal. Static seals mainly include three categories: gasket seals, sealant seals and direct contact seals; according to the working pressure, static seals can be divided into medium and low pressure static seals and high pressure static seals; medium and low pressure static seals usually use gasket seals with softer materials and wider widths, while high pressure static seals use metal gaskets with harder materials and very narrow contact widths; Regarding the dynamic seal 6: the seal between the relatively moving parts in the machine (or equipment). Dynamic seals are divided into two categories: reciprocating dynamic seals and rotary dynamic seals. Reciprocating dynamic seals include molded packing seals, stuffing box seals and expansion ring seals. Rotary dynamic seals include: contact dynamic seals where the moving part is in direct contact with the stationary part; non-contact dynamic seals where the two are not in direct contact; semi-fluid dynamic seals that use the special properties of the fluid added in the sealing gap to achieve sealing.

[0028] Working principle: by machining a thread on the inner hole of the end face of the cylinder 2 to match with the outer circle of the guide sleeve 1, the outer circle of the cylinder 2 is machined to prevent loosening, and after the product passes the pressure test, the convex portion 203 of the anti-loosening member 202 extending from the tightening process groove 102 seals the secondary groove 106, and the height of the first-level platform 105 is greater than the width of the waterproof O-ring 3. Under the joint action of the first-level platform 105, the secondary groove 106, the convex portion 203 of the anti-loosening member 202 and the end cover 101 of the guide sleeve 1, the waterproof O-ring 3 is covered and limited, so that the waterproof O-ring 3 will not be squeezed out and fail, thereby increasing the service life of the waterproof O-ring 3.

[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A hydraulic cylinder, comprising a guide sleeve (1) and a cylinder barrel (2), characterized in that: An anti-loosening groove (201) is provided on the outer circumference of the cylinder barrel (2), and a matching anti-loosening member (202) is arranged in the anti-loosening groove (201); a tightening process groove (102) is milled on the outer circumference of the end cover (101) of the guide sleeve (1), and a receiving groove (103) for receiving a waterproof O-ring (3) is provided at the connection between the outer circumference of the end cover (101) of the guide sleeve (1) and the sleeve body (104) of the guide sleeve (1); The tightening process groove (102) comprises a primary platform (105) and a secondary groove (106), the primary platform (105) and the secondary groove (106) are stepped, the convex portion (203) of the anti-loosening member (202) extending from the tightening process groove (102) seals the secondary groove (106), and the height of the primary platform (105) is greater than the width of the waterproof O-ring (3).

2. The hydraulic cylinder according to claim 1, characterized in that: The material of the anti-loosening component (202) is No. 45 steel plate.

3. The hydraulic cylinder according to claim 2, characterized in that: The outer diameter of the end cover (101) of the guide sleeve (1) is greater than the diameter of the sleeve body (104).

4. The hydraulic cylinder according to claim 1, characterized in that: An external thread matching the internal thread of the inner hole of the cylinder barrel (2) is arranged on the outer circle of the sleeve body (104) of the guide sleeve (1).

5. The hydraulic cylinder according to claim 4, characterized in that: It also comprises a piston rod (4), and the inner hole of the guide sleeve (1) is connected to the outer circle of the piston rod (4) in a matching manner.

6. The hydraulic cylinder according to claim 5, characterized in that: It also includes a dynamic seal (6) integrated on the piston rod (4) and a static seal (5) integrated on the cylinder barrel (2).

7. The hydraulic cylinder according to claim 1, characterized in that: The guide sleeve (1) is made of round steel.

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