Cylinder sleeve of hydraulic oil cylinder

Abstract

The invention relates to the technology of cylinder sleeves of hydraulic oil cylinders, in particular to a cylinder sleeve of a hydraulic oil cylinder, which comprises a sleeve body and a cover body connected to one end of the sleeve body so as to form a movable cavity for a piston rod to move, the sleeve body comprises an outer cylinder body and an inner cylinder body, and the two ends of the inner cylinder body are communicated with each other and are hollow. One end of the outer cylinder is provided with a station opening allowing the inner cylinder to be inserted, the other end of the outer cylinder is provided with a bottom cover part used for sealing one port of the inner cylinder, a liquid outlet channel is arranged between the outer cylinder and the inner cylinder, the outer cylinder is provided with a first oil inlet hole and a second oil inlet hole, the first oil inlet hole sequentially penetrates through the outer cylinder and the inner cylinder, and the second oil inlet hole sequentially penetrates through the inner cylinder and the outer cylinder. The second oil inlet hole penetrates through the outer cylinder and communicates with one end of the liquid outlet channel, the other end of the liquid outlet channel communicates with the inner wall of the inner cylinder, so that hydraulic oil passes through the liquid outlet channel when entering and exiting from the second oil inlet hole, the structure is reasonable and simple, practicability is high, and the buffering effect can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cylinder sleeves of hydraulic oil cylinders, and more specifically, to a cylinder sleeve of a hydraulic oil cylinder. Background Art

[0002] The hydraulic cylinder is a key component in the hydraulic system. It converts hydraulic energy into mechanical energy to achieve linear motion or swing. The structure of the hydraulic cylinder usually includes the following main parts: Cylinder, piston, piston rod, seal, guide sleeve, buffer device, exhaust valve, exhaust valve and oil inlet and outlet. The piston fits tightly inside the cylinder, and it moves under the action of hydraulic oil to convert hydraulic energy into mechanical energy.

[0003] The buffer devices are at both ends of the cylinder to absorb the impact at the end of the movement and prevent the piston from hitting the end of the cylinder. For example, a buffer hydraulic cylinder structure disclosed in announcement number CN117028357A, through the first damping hole, buffer sleeve, and first buffer chamber, can be set so that when the cylinder push rod moves to the guide seat with the piston, the buffer sleeve squeezes the hydraulic oil in the first buffer chamber, and the hydraulic pressure in the first buffer chamber is discharged from the first damping hole. At this time, the buffer sleeve is deformed, and then the buffering effect of the front end of the cylinder body is guaranteed by the joint action of the deformation of the buffer sleeve itself, the compression of the hydraulic oil in the first buffer chamber, and the damping buffer of the first damping hole.

[0004] This prior art also achieves the purpose of buffering by extruding and setting the structural deformation of the buffer sleeve.

[0005] There is also a multi-chamber hydraulic cylinder with a buffering function disclosed in announcement number CN116753210B, in which the piston moves to trigger the travel switch, the electromagnet is energized to generate a magnetic field, and the push plate moves downward under the action of the magnetic force. The inclined surface of the guide groove squeezes the guide rod, thereby causing the current limiting column to move to the left and gradually enter the inner cavity of the oil pipe joint. The cross-section of the inner cavity of the oil pipe joint becomes smaller, and the flow rate of the hydraulic oil decreases, thereby reducing the piston movement speed, thereby playing the role of piston buffering. It will not cause the piston rod stroke to be restricted, and improve the stability of the piston buffering.

[0006] This prior art deviates from the existing method of adding a buffer structure and realizes buffering by controlling the flow of hydraulic oil, but requires the addition of a special solenoid valve for control.

[0007] Based on some of the deficiencies in the existing technology, the purpose of this application is to improve the cylinder structure so that the hydraulic oil can provide power while providing a buffering effect. Summary of the invention

[0008] In view of the deficiencies in the prior art, an object of the present invention is to provide a cylinder sleeve of a hydraulic oil cylinder which has a reasonable and simple structure, strong practicality and can improve the buffering effect.

[0009] To achieve the above object, the present invention provides the following technical solutions: A cylinder sleeve of a hydraulic oil cylinder comprises a sleeve body and a cover body connected to one end of the sleeve body so as to form an active chamber for the piston rod to move. The sleeve body comprises an outer cylinder body and an inner cylinder body. The two ends of the inner cylinder body are connected to each other and are hollow. One end of the outer cylinder body has a station opening for inserting the inner cylinder body, and the other end is a bottom cover part for sealing one of the ports of the inner cylinder body. There is a liquid outlet channel between the outer cylinder and the inner cylinder. The outer cylinder is provided with a first oil inlet hole and a second oil inlet hole. The first oil inlet hole passes through the outer cylinder and the inner cylinder in sequence. The second oil inlet hole penetrates the outer cylinder and is connected to one end of the liquid outlet channel, and the other end of the liquid outlet channel is connected to the inner wall of the inner cylinder, so that the hydraulic oil passes through the path of the liquid outlet channel when entering and exiting from the second oil inlet hole.

[0010] The present invention is further configured as follows: the liquid outlet channel is spirally opened between the outer cylinder and the inner cylinder, that is, is placed on the inner wall of the outer cylinder and the outer wall of the inner cylinder.

[0011] The present invention is further configured as follows: the liquid outlet channel is composed of a first half spiral groove on the inner wall of the outer cylinder and a second half spiral groove on the outer wall of the inner cylinder. A plurality of sealing rings are also provided on the outer wall of the inner cylinder, and the sealing rings are placed between two adjacent second half spiral grooves. An extrusion groove body for adapting the sealing ring is also provided on the inner wall of the outer cylinder.

[0012] The present invention is further configured such that the ratio of the groove depth of the first semi-spiral groove to the wall thickness of the outer cylinder is 1.5-2.0. The present invention is further configured such that the ratio of the groove depth of the second semi-spiral groove to the wall thickness of the inner cylinder is 1.3-1.8.

[0013] The present invention is further configured such that: the outer ring of the sealing ring is close to the groove edge of the second half spiral groove.

[0014] The present invention is further configured as follows: the bottom cover portion is provided with an annular groove for inserting the end of the inner cylinder.

[0015] The present invention is further configured as follows: the upper portion of the bottom cover extends into the cavity of the inner cylinder, and the end surface of the portion forms a fluid profile, which includes a convex section protruding forward and concave sections arranged on both sides of the convex section, and the concave section is recessed toward the rear.

[0016] The present invention is further configured such that: the convex surface segment and the concave surface segment are combined in an S-shape.

[0017] Compared with the shortcomings of the prior art, the beneficial effects of the present invention are: By setting a spiral liquid outlet channel between the outer cylinder and the inner cylinder, the hydraulic oil can move along the spiral path when flowing, thereby increasing the contact area between the hydraulic oil and the channel wall, helping to evenly distribute the pressure and improve the flow efficiency of the hydraulic oil. At the same time, the heat exchange effect between the hydraulic oil and the cylinder body is enhanced, which helps to dissipate the heat in the hydraulic system more effectively, prevent the system from overheating, and further improve the working stability of the system.

[0018] When the piston rod is reset and squeezes the hydraulic oil, the hydraulic oil will be discharged from the inner cylinder into the liquid outlet channel. Since the passage path is increased, a good pressure relief effect is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the explosion structure of the present invention; Figure 2 It is a cross-sectional schematic diagram of the present invention.

[0020] Figure 3 It is a half-cutaway perspective schematic diagram of the inner cylinder of the present invention; Figure 4 It is a half-cut three-dimensional schematic diagram of the outer cylinder of the present invention.

[0021] Sleeve body 1, outer cylinder body 2, inner cylinder body 3, bottom cover part 4, annular groove 40, fluid profile 5, convex surface section 51, concave surface section 52, liquid outlet channel 6, first semi-spiral groove 61, second semi-spiral groove 62, first oil inlet hole 101, second oil inlet hole 102, sealing ring 7. DETAILED DESCRIPTION

[0022] Reference Figures 1 to 4 The embodiments of the present invention are further described.

[0023] The specific structure of this embodiment includes a sleeve 1 and a cover body connected to one end of the sleeve 1 to form an active chamber for the piston rod to move. The sleeve 1 includes an outer cylinder 2 and an inner cylinder 3 arranged coaxially, thereby forming a double-layer structure. The two ends of the inner cylinder 3 are interconnected and hollow. One end of the outer cylinder 2 has a station opening for inserting the inner cylinder 3, and the other end is a bottom cover 4 for sealing one of the ports of the inner cylinder 3.

[0024] The bottom cover 4 is provided with an annular groove 40 for inserting the end of the inner cylinder 3. After installation, part of the bottom cover 4 extends into the cavity of the inner cylinder 3, and the end surface of the part is formed with a fluid profile 5, which includes a convex section 51 protruding forward and concave sections 52 arranged on both sides of the convex section 51. The concave section 52 is recessed backward, and the convex section 51 and the concave section 52 are combined in an S shape.

[0025] When the piston rod retreats, the hydraulic oil is quickly squeezed toward the fluid profile 5. The convex section 51 protrudes forward to contact the high-pressure area of ​​the hydraulic oil first. The convex shape of this part helps to gradually disperse the pressure of the hydraulic oil and avoid sudden pressure concentration, thereby reducing the impact load inside the hydraulic system.

[0026] The hydraulic oil passes through the convex section 51 and enters the concave sections 52 on both sides. The design of the concave section 52 being recessed backward provides an expansion space for the hydraulic oil, so that the flow path of the hydraulic oil is naturally guided and spread to a wider area, reducing turbulence and turbulence that may be generated during the flow process.

[0027] In order to prevent the hydraulic oil from expanding rapidly when flowing through the fluid profile 5, if the arc angle of the concave section 52 is too large or too steep, resulting in a local pressure drop and the formation of a low-pressure area, which is prone to cavitation. Therefore, the arc angle of the convex section 51 is 15-30°, and the arc angle of the concave section 52 is 20-35°.

[0028] If the curvature of the convex section 51 is less than 15°, the guiding effect on the hydraulic oil is insufficient, affecting the flow efficiency; If the curvature of the convex section 51 is greater than 30°, the flow direction of the hydraulic oil changes too sharply, increasing the risk of fluid separation and local pressure drop; If the curvature of the concave end is less than 20°, the fluid will not flow smoothly in the concave section 52, resulting in accumulation and stagnation; If the curvature of the concave end is greater than 30°, it may cause a local low-pressure area and increase the risk of cavitation.

[0029] There is a liquid outlet channel 6 between the outer cylinder 2 and the inner cylinder 3. The outer cylinder 2 is provided with a first oil inlet hole 101 and a second oil inlet hole 102. The first oil inlet hole 101 passes through the outer cylinder 2 and the inner cylinder 3 in sequence, thereby directly introducing the external hydraulic oil into the interior of the inner cylinder 3, which is used to exert a force when the piston retreats.

[0030] The second oil inlet hole 102 penetrates the outer cylinder 2 and is connected to one end of the liquid outlet channel 6, and the other end of the liquid outlet channel 6 is connected to the inner wall of the inner cylinder 3. When the hydraulic oil is introduced from the liquid outlet channel 6 between the outer cylinder 2 and the inner cylinder 3 into the inner cylinder 3, the third oil inlet hole 103 located on the inner wall of the inner cylinder 3 is connected to the end of the liquid outlet channel 6, and the hydraulic oil can flow from the liquid outlet channel 6 into the inner cylinder 3 through the third oil inlet hole.

[0031] The liquid outlet channel 6 is spirally opened between the outer cylinder 2 and the inner cylinder 3, that is, placed on the inner wall of the outer cylinder 2 and the outer wall of the inner cylinder 3. The spiral channel increases the contact area of ​​the fluid by extending the flow path of the hydraulic oil, which is beneficial to the heat dissipation and enhances the buffering effect of the hydraulic oil. The spiral structure can help evenly distribute the pressure of the hydraulic oil and reduce the situation of excessive local pressure.

[0032] The liquid outlet channel 6 is composed of a first half spiral groove 61 on the inner wall of the outer cylinder 2 and a second half spiral groove 62 on the outer wall of the inner cylinder 3 .

[0033] The ratio of the groove depth of the first half spiral groove 61 to the wall thickness of the outer cylinder 2 is 1.5-2.0. The ratio of the groove depth of the second half spiral groove 62 to the wall thickness of the inner cylinder 3 is 1.3-1.8. The proportional design of the two can increase the flow area of ​​the hydraulic oil, reduce the flow resistance, and improve the flow efficiency of the hydraulic oil.

[0034] If the ratio of the groove depth of the first half spiral groove 61 to the wall thickness of the outer cylinder 2 is less than 1.5, and the ratio of the groove depth of the second half spiral groove 62 to the wall thickness of the inner cylinder 3 is less than 1.3, the groove depth is too shallow, which will restrict the flow channel of the hydraulic oil, increase the fluid resistance, and cause the flow efficiency to decrease; If the ratio of the groove depth of the first half spiral groove 61 to the wall thickness of the outer cylinder 2 is greater than 2.0, and the ratio of the groove depth of the second half spiral groove 62 to the wall thickness of the inner cylinder 3 is greater than 1.8, the structural strength of the outer cylinder 2 is weakened. Especially in a high-pressure environment, the cylinder cannot withstand the internal pressure, thereby increasing the risk of structural failure.

[0035] A plurality of sealing rings 7 are also provided on the outer wall of the inner cylinder 3. The sealing rings 7 are placed between two adjacent second semi-spiral grooves 62. The outer ring of the sealing ring 7 is close to the groove edge of the second semi-spiral groove 62. An extrusion groove for the sealing ring to fit is also provided on the inner wall of the outer cylinder 2.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A cylinder sleeve of a hydraulic cylinder, comprising a sleeve body (1) and a cover body connected to one end of the sleeve body (1) so as to form an active chamber for a piston rod to move, characterized in that: The sleeve (1) comprises an outer cylinder (2) and an inner cylinder (3), the two ends of the inner cylinder (3) being interconnected and hollow, one end of the outer cylinder (2) having a station opening for inserting the inner cylinder (3), and the other end of the outer cylinder (2) being a bottom cover (4) for sealing one end of the inner cylinder (3). A liquid outlet passage (6) is provided between the outer cylinder (2) and the inner cylinder (3); a first oil inlet hole (101) and a second oil inlet hole (102) are provided on the outer cylinder (2); the first oil inlet hole (101) passes through the outer cylinder (2) and the inner cylinder (3) in sequence; The second oil inlet hole (102) passes through the outer cylinder (2) and is connected to one end of the liquid outlet channel (6), and the other end of the liquid outlet channel (6) is connected to the inner wall of the inner cylinder (3), so that the hydraulic oil passes through the liquid outlet channel (6) when entering and exiting from the second oil inlet hole (102).

2. The cylinder sleeve of a hydraulic cylinder according to claim 1, characterized in that: The liquid outlet channel (6) is spirally opened between the outer cylinder (2) and the inner cylinder (3), that is, it is placed on the inner wall of the outer cylinder (2) and the outer wall of the inner cylinder (3).

3. The cylinder sleeve of a hydraulic cylinder according to claim 2, characterized in that: The liquid outlet channel (6) is composed of a first half spiral groove (61) on the inner wall of the outer cylinder (2) and a second half spiral groove (62) on the outer wall of the inner cylinder (3). A plurality of sealing rings (7) are also provided on the outer wall of the inner cylinder (3), and the sealing rings are placed between two adjacent second half spiral grooves (62). An extrusion groove for adapting the sealing ring is also provided on the inner wall of the outer cylinder (2).

4. The cylinder sleeve of the hydraulic cylinder according to claim 3, characterized in that: The ratio of the groove depth of the first semi-spiral groove (61) to the wall thickness of the outer cylinder (2) is 1.5-2.

0.

5. The cylinder sleeve of the hydraulic cylinder according to claim 4, characterized in that: The ratio of the groove depth of the second semi-spiral groove (62) to the wall thickness of the inner cylinder (3) is 1.3-1.

8.

6. The cylinder sleeve of the hydraulic cylinder according to claim 5, characterized in that: The outer ring of the sealing ring is close to the groove edge of the second half spiral groove (62).

7. The cylinder sleeve of a hydraulic cylinder according to claim 2, characterized in that: The bottom cover portion (4) is provided with an annular groove (40) for inserting the end of the inner cylinder (3).

8. The cylinder sleeve of a hydraulic cylinder according to claim 2, characterized in that: The upper portion of the bottom cover portion (4) extends into the cavity of the inner cylinder (3), and the end surface of the portion is formed with a fluid profile (5), the fluid profile (5) comprising a convex surface section (51) protruding forward and concave surface sections (52) disposed on both sides of the convex surface section (51), the concave surface section (52) being concave toward the rear.

9. The cylinder sleeve of a hydraulic cylinder according to claim 8, characterized in that: The convex surface section (51) and the concave surface section (52) are combined in an S-shape.

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