Positioning sleeve and hydraulic cylinder adopting same

Abstract

A piston rod is movably located in a cylinder body, the positioning sleeve is further arranged at the position close to an end cover and on the side, away from the end cover, of an oil inlet, a plurality of axial oil passing grooves are formed in the inner wall of the positioning sleeve, a positioning face is arranged on the inner wall of the positioning sleeve, and the positioning face is in sliding contact with the piston rod. And a guiding function is realized. The sum of the cross sections of the oil passing grooves is larger than the cross section of the oil inlet. By the adoption of the structure of the positioning sleeve with the oil passing groove, the oil passing flow can be ensured, and meanwhile the positioning effect can be provided for the piston rod.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic cylinders, in particular to a positioning sleeve and a hydraulic cylinder using the positioning sleeve. Background Art

[0002] The opening and closing of some gates are driven by hydraulic cylinders. When the buffer structure of the hydraulic cylinder of the rapid gate hydraulic hoist adopts an annular gap constant throttling buffer device, the piston rod is mainly supported and guided by the piston rod guide sleeve. Figure 1 In the process, the piston rod guide sleeve is arranged on the side of the buffer oil port close to the piston rod end cover. When the piston rod is fully extended and the piston has not completely entered the buffer sleeve, the piston rod is prone to overload under the action of gravity, which may cause the buffer ring and the buffer sleeve to be strained. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a positioning sleeve and a hydraulic cylinder using the positioning sleeve, which can provide guide support for the piston rod under the premise of ensuring oil supply and avoid eccentric load damage.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a hydraulic cylinder, the piston rod is movably located in the cylinder body, and a positioning sleeve is also provided at a position close to the end cover and on the side of the oil inlet away from the end cover. The inner wall of the positioning sleeve is provided with a plurality of axial oil grooves, and the inner wall of the positioning sleeve is provided with a positioning surface, which is in sliding contact with the piston rod and realizes a guiding function.

[0005] In a preferred solution, a buffer sleeve is further provided on a side of the positioning sleeve away from the end cover, one end of the positioning sleeve is limited by the oil inlet, and the other end is limited by the buffer sleeve.

[0006] In a preferred solution, a step is provided on the cylinder body, a pressure ring is provided at the position of the step, the pressure ring is connected to the step by screws, and the pressure ring limits the axial position of the buffer sleeve.

[0007] In a preferred solution, a guide sleeve is provided on the other side of the oil inlet, and the inner wall of the guide sleeve is in sliding contact with the piston rod and realizes a guiding function;

[0008] The other end of the guide sleeve is provided with an end cover, and the end cover is fixedly connected to the cylinder body.

[0009] In a preferred solution, a cylinder mouth section is provided at a position of the cylinder body near the end cover, the cylinder mouth section is a cylindrical structure, the cylinder mouth section is provided with a hollow inner cavity, and the cylinder mouth section is connected to the rest of the cylinder body by a flange;

[0010] The buffer sleeve, positioning sleeve, oil inlet and guide sleeve are all located within the cylinder mouth section.

[0011] In a preferred solution, the positioning sleeve is a cylindrical structure, the middle of the positioning sleeve is a hollow cavity, the oil grooves are evenly arranged along the inner wall of the positioning sleeve, and the position of the inner wall of the positioning sleeve where no oil grooves are provided is the positioning surface.

[0012] In a preferred solution, the positioning sleeve is a cylindrical structure, the middle of the positioning sleeve is a hollow cavity, and the oil grooves are through holes evenly arranged along the inner wall of the positioning sleeve.

[0013] In a preferred solution, the sum of the cross-sections of the oil grooves is greater than the cross-section of the oil inlet.

[0014] A positioning sleeve for the above hydraulic cylinder, the inner wall of the positioning sleeve is provided with a plurality of axial oil grooves, the inner wall of the positioning sleeve is provided with a positioning surface, the positioning surface is in sliding contact with the piston rod and realizes the guiding function.

[0015] In a preferred solution, the positioning sleeve is a cylindrical structure, the middle of the positioning sleeve is a hollow cavity, and the oil grooves are evenly arranged along the inner wall of the positioning sleeve;

[0016] The oil grooves are evenly arranged along the inner wall of the positioning sleeve;

[0017] The oil groove is an open groove structure or a through hole along the axial direction;

[0018] The sum of the cross-sections of the oil grooves is greater than the cross-section of the oil inlet.

[0019] The utility model provides a positioning sleeve and a hydraulic cylinder using the positioning sleeve. By adopting the structure of the positioning sleeve with an oil groove, the positioning effect can be provided for the piston rod while ensuring the oil flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0022] Figure 2 It is a three-dimensional diagram of the positioning sleeve of the utility model.

[0023] In the figure: positioning sleeve 1, oil groove 101, positioning surface 102, cylinder mouth section 2, buffer sleeve 3, pressure ring 4, cylinder body 5, oil inlet 6, guide sleeve 7, sealing element 8, lubricating oil port 9, end cover 10, piston rod 11. DETAILED DESCRIPTION

[0024] Embodiment 1:

[0025] like Figure 1~2In the figure, a hydraulic cylinder is shown, in which a piston rod 11 is movably located in a cylinder body 5. A positioning sleeve 1 is provided at a position close to the end cover 10 and on the side of the oil inlet 6 away from the end cover 10. The inner wall of the positioning sleeve 1 is provided with a plurality of axial oil grooves 101. The inner wall of the positioning sleeve 1 is provided with a positioning surface 102. The positioning surface 102 is in sliding contact with the piston rod 11 and realizes a guiding function. With this structure, the positioning sleeve 1 can allow the hydraulic oil of the oil inlet 6 to pass through and flow during normal operation. At the same time, the positioning surface 102 can also provide guiding support for the piston rod 11 to avoid the strain on the buffer sleeve 3 caused by unbalanced load. Figure 1 As shown in FIG, when the piston rod 11 is fully extended, the positioning surface 102 of the positioning sleeve 1 contacts and supports the outer wall of the piston rod 11, thereby greatly increasing the axial length of the structure supporting the piston rod 11 and avoiding the influence of the eccentric load on the piston rod 11. Due to the structure of the oil groove 101, the hydraulic oil from the oil inlet 6 can pass through the positioning sleeve 1 without affecting the normal operation of the hydraulic cylinder.

[0026] The preferred solution is Figure 1 In the embodiment, a buffer sleeve 3 is further provided on the side of the positioning sleeve 1 away from the end cover 10, one end of the positioning sleeve 1 is limited by the oil inlet 6, and the other end is limited by the buffer sleeve 3. The buffer sleeve 3 forms a slit structure through a gap and a protrusion on the piston, thereby achieving buffering.

[0027] The preferred solution is Figure 1 In the embodiment, a step is provided on the cylinder body 5, a pressure ring 4 is provided at the position of the step, the pressure ring 4 is connected to the step by screws, and the pressure ring 4 limits the axial position of the buffer sleeve 3. With this structure, the installation of the buffer sleeve 3 and the positioning sleeve 1 is facilitated.

[0028] The preferred solution is Figure 1 In the embodiment, a guide sleeve 7 is provided on the other side of the oil inlet 6, the inner wall of the guide sleeve 7 is in sliding contact with the piston rod 11 and realizes the guiding function; an end cover 10 is provided at the other end of the guide sleeve 7, and the end cover 10 is fixedly connected to the cylinder body 5.

[0029] The preferred solution is Figure 1 In the embodiment, a cylinder body 5 is provided with a cylinder body mouth section 2 near the end cover 10. The cylinder body mouth section 2 is a cylindrical structure, and a hollow inner cavity is provided in the cylinder body mouth section 2. The cylinder body mouth section 2 is connected to the rest of the cylinder body 5 by a flange.

[0030] The buffer sleeve 3, the positioning sleeve 1, the oil inlet 6 and the guide sleeve 7 are all located in the cylinder body mouth section 2. This structure facilitates the installation of the buffer sleeve 3, the positioning sleeve 1, the oil inlet 6 and the guide sleeve 7.

[0031] The preferred solution is Figure 1In the figure, the positioning sleeve 1 is a cylindrical structure, the middle of the positioning sleeve 1 is a hollow cavity, the oil grooves 101 are evenly arranged along the inner wall of the positioning sleeve 1, and the position of the inner wall of the positioning sleeve 1 where the oil grooves 101 are not set is the positioning surface 102.

[0032] In another optional solution, the positioning sleeve 1 is a cylindrical structure, the middle of the positioning sleeve 1 is a hollow cavity, and the oil grooves 101 are through holes evenly arranged along the inner wall of the positioning sleeve 1 .

[0033] In a preferred solution, the sum of the cross-sections of the oil grooves 101 is greater than the cross-section of the oil inlet 6 .

[0034] Embodiment 2:

[0035] like Figure 2 In the invention, a positioning sleeve 1 is used for the above hydraulic cylinder, and the inner wall of the positioning sleeve 1 is provided with a plurality of oil grooves 101 along the axial direction, and the inner wall of the positioning sleeve 1 is provided with a positioning surface 102, and the positioning surface 102 is in sliding contact with the piston rod 11 and realizes the guiding function.

[0036] In a preferred solution, the positioning sleeve 1 is a cylindrical structure, the middle of the positioning sleeve 1 is a hollow cavity, and the oil grooves 101 are evenly arranged along the inner wall of the positioning sleeve 1;

[0037] The oil grooves 101 are evenly arranged along the inner wall of the positioning sleeve 1;

[0038] The oil groove 101 is an open groove structure or a through hole along the axial direction;

[0039] The sum of the cross-sections of the oil grooves 101 is greater than the cross-section of the oil inlet 6 .

[0040] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The embodiments and features in the embodiments of the present application can be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A hydraulic cylinder, characterized in that: The piston rod (11) is movably located in the cylinder body (5). A positioning sleeve (1) is provided at a position close to the end cover (10) and on a side of the oil inlet (6) away from the end cover (10). The inner wall of the positioning sleeve (1) is provided with a plurality of axial oil grooves (101). The inner wall of the positioning sleeve (1) is provided with a positioning surface (102). The positioning surface (102) is in sliding contact with the piston rod (11) and realizes a guiding function.

2. A hydraulic cylinder according to claim 1, characterized in that: A buffer sleeve (3) is also provided on a side of the positioning sleeve (1) away from the end cover (10); one end of the positioning sleeve (1) is limited by the oil inlet (6) and the other end is limited by the buffer sleeve (3).

3. A hydraulic cylinder according to claim 2, characterized in that: A step is provided on the cylinder body (5), a pressure ring (4) is provided at the position of the step, the pressure ring (4) is connected to the step via screws, and the pressure ring (4) limits the axial position of the buffer sleeve (3).

4. A hydraulic cylinder according to claim 3, characterized in that: A guide sleeve (7) is provided on the other side of the oil inlet (6); the inner wall of the guide sleeve (7) is in sliding contact with the piston rod (11) and realizes a guiding function; The other end of the guide sleeve (7) is provided with an end cover (10), and the end cover (10) is fixedly connected to the cylinder body (5).

5. A hydraulic cylinder according to claim 4, characterized in that: A cylinder body mouth section (2) is provided at a position of the cylinder body (5) close to the end cover (10); the cylinder body mouth section (2) is a cylindrical structure, the cylinder body mouth section (2) is provided with a hollow inner cavity, and the cylinder body mouth section (2) is connected to the rest of the cylinder body (5) by a flange; The buffer sleeve (3), the positioning sleeve (1), the oil inlet (6) and the guide sleeve (7) are all located within the cylinder body port section (2).

6. A hydraulic cylinder according to claim 1, characterized in that: The positioning sleeve (1) is a cylindrical structure, the middle of the positioning sleeve (1) is a hollow cavity, the oil grooves (101) are evenly arranged along the inner wall of the positioning sleeve (1), and the position of the inner wall of the positioning sleeve (1) where the oil grooves (101) are not provided is the positioning surface (102).

7. A hydraulic cylinder according to claim 1, characterized in that: The positioning sleeve (1) is a cylindrical structure, the middle of the positioning sleeve (1) is a hollow cavity, and the oil grooves (101) are through holes evenly arranged along the inner wall of the positioning sleeve (1).

8. A hydraulic cylinder according to any one of claims 1, 6 to 7, characterized in that: The sum of the cross-sections of the oil grooves (101) is greater than the cross-section of the oil inlet (6).

9. A positioning sleeve for a hydraulic cylinder according to any one of claims 1 to 8, characterized in that: The inner wall of the positioning sleeve (1) is provided with a plurality of axially extending oil grooves (101), and the inner wall of the positioning sleeve (1) is provided with a positioning surface (102). The positioning surface (102) is in sliding contact with the piston rod (11) and realizes a guiding function.

10. A positioning sleeve for a hydraulic cylinder according to claim 9, characterized in that: The positioning sleeve (1) is a cylindrical structure, the middle of the positioning sleeve (1) is a hollow cavity, and the oil grooves (101) are evenly arranged along the inner wall of the positioning sleeve (1); The oil grooves (101) are evenly arranged along the inner wall of the positioning sleeve (1); The oil groove (101) is an open groove structure or a through hole along the axial direction; The sum of the cross-sections of the oil grooves (101) is greater than the cross-section of the oil inlet (6).

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