Piston and piston rod connecting structure of hydraulic oil cylinder

Abstract

The utility model relates to the technical field of hydraulic jacks, and discloses a piston and piston rod connecting structure of a hydraulic oil cylinder, which comprises a piston rod, a movable sliding plug is arranged at the bottom of the piston rod, and a connecting groove is formed in the center of the top of the movable sliding plug. The position, corresponding to the connecting groove, of the bottom of the piston rod is fixedly connected with a threaded connector, the threaded connector is in threaded connection with the inner wall of the connecting groove, the piston rod is connected with the movable sliding plug by arranging the connecting groove and the threaded connector, and then a reinforcing ring is matched with a reinforcing hole to insert a flat-bottomed screw for secondary reinforcing; the connecting stability of the piston rod and the movable sliding plug can guarantee the mounting stability of the movable sliding plug, and the problem that the sealing performance is reduced due to the fact that one side is excessively abraded due to deviation is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic jacks, in particular to a connecting structure of a piston and a piston rod of a hydraulic oil cylinder. Background Art

[0002] In the hydraulic cylinder used in the hydraulic jack, the piston and the piston rod are usually directly connected by threads, or the piston is pressed against the end of the piston rod by a nut, and the nut is used to prevent loosening. The anti-loosening effect is poor, and a radial anti-loosening pin is usually used to prevent the threaded connection from rotating and loosening. The anti-loosening pin is matched after the piston and the piston rod are assembled.

[0003] The prior art publication number is CN209875612U, which provides a technical solution: a piston and piston rod connection structure of a hydraulic oil cylinder, characterized in that the rod end of the piston rod is provided with an external thread connection part, and the piston rod is provided with a clamping groove and a shaft shoulder; the piston includes a main body and a clamping sleeve, and one end of the main body of the piston is against the shaft shoulder; the outer end of the main body of the piston is provided with a conical first tapered hole, the outer side surfaces of the two half rings are conical surfaces, and the two half rings are relatively clamped in the clamping groove and the first tapered hole; the clamping sleeve of the piston is threadedly connected to the external thread connection part of the piston rod; the inner side end of the anti-loosening nut is provided with a conical frustum part, and the outer end of the clamping sleeve is provided with a second conical hole, the anti-loosening nut is threadedly connected to the external thread connection part of the piston rod and compresses the clamping sleeve of the piston, and the frustum part of the anti-loosening nut is in contact with the second conical hole of the clamping sleeve. The utility model has a simple and compact structure, is easy to disassemble and assemble the piston and the piston rod, is reliable in preventing loosening, and avoids extrusion and deformation of the thread, reduces maintenance costs, and prolongs the service life of the hydraulic oil cylinder.

[0004] but:

[0005] Once the sealing ring is damaged, the media in the rodless chamber and the rod chamber will flow into each other, which may cause the piston cylinder to fail to move in severe cases. At the same time, higher stability requirements are placed on the piston installation to avoid deviation that causes excessive wear on one side, and at the same time, its sealing performance needs to be ensured. Utility Model Content

[0006] 1. Technical issues to be solved

[0007] In view of the deficiencies in the prior art, the utility model provides a connecting structure between a piston and a piston rod of a hydraulic cylinder.

[0008] (II) Technical solution

[0009] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a piston and piston rod connection structure of a hydraulic cylinder, comprising a piston rod, a movable sliding plug is arranged at the bottom of the piston rod, a connecting groove is opened at the center of the top of the movable sliding plug, a threaded joint is fixedly connected to the position of the bottom of the piston rod corresponding to the connecting groove, and the threaded joint is threadedly connected to the inner wall of the connecting groove, a reinforcement ring is fixedly connected to the outer wall of the piston rod near the bottom, reinforcement holes are respectively opened at positions around the top of the movable sliding plug, and the positions of the reinforcement ring corresponding to the four reinforcement holes are respectively fixedly connected to the reinforcement holes by flat-bottomed screws, the piston rod is connected to the movable sliding plug by setting the connecting groove and the threaded joint, and then the flat-bottomed screws are inserted into the reinforcement hole through the reinforcement ring in conjunction with the reinforcement hole for secondary reinforcement, so that the stability of the connection between the piston rod and the movable sliding plug can ensure the stability of the installation of the movable sliding plug, and avoid the problem of excessive wear on one side caused by offset, resulting in reduced sealing.

[0010] Preferably, the connection points of the flat-bottom screws are detachably connected with anti-skid pads to prevent the flat-bottom screws from loosening.

[0011] Preferably, a first sealing groove is provided on the outer wall of the movable sliding plug near the top, and a first sealing ring is detachably connected to the inner wall of the first sealing groove; a second sealing groove is provided on the outer wall of the movable sliding plug near the bottom, and a second sealing ring is detachably connected to the second sealing groove; by arranging the first sealing ring on the inner wall of the first sealing groove and the second sealing ring on the inner wall of the second sealing groove, the overall sealing performance of the movable sliding plug can be improved through a multi-stage sealing arrangement.

[0012] Preferably, the number of the first sealing grooves is two, the number of the first sealing rings is two, the number of the second sealing grooves is two, and the number of the second sealing rings is two.

[0013] Preferably, a buffer pad is fixedly connected to the bottom of the movable sliding plug.

[0014] Preferably, a labyrinth groove is provided at the middle section of the outer wall of the movable sliding plug, and the labyrinth groove is composed of multiple groups of annular grooves. By setting the labyrinth groove at the middle section of the outer wall of the movable sliding plug, when the second sealing ring wears and leaks, the labyrinth structure formed by the multiple groups of annular grooves in the labyrinth groove can effectively delay the leakage of liquid in the hydraulic cylinder.

[0015] (III) Beneficial effects

[0016] Compared with the prior art, the utility model provides a piston and piston rod connection structure of a hydraulic cylinder, which has the following beneficial effects:

[0017] 1. The piston and piston rod connection structure of a hydraulic cylinder connects the piston rod and the movable sliding plug by setting a connecting groove and a threaded joint, and then inserts a flat-bottomed screw through a reinforcement ring and a reinforcement hole for secondary reinforcement. The stability of the connection between the piston rod and the movable sliding plug can ensure the stability of the installation of the movable sliding plug, avoiding the problem of excessive wear on one side due to deviation, resulting in reduced sealing.

[0018] 2. The piston and piston rod connection structure of the hydraulic cylinder is provided with a first sealing ring on the inner wall of the first sealing groove and a second sealing ring on the inner wall of the second sealing groove. The multi-stage sealing setting can improve the overall sealing performance of the movable sliding plug. When the second sealing ring is worn and leaks, the labyrinth structure formed by the multiple groups of annular grooves in the labyrinth groove can effectively delay the leakage of liquid in the hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 It is the front view of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the movable sliding plug of the utility model;

[0022] Figure 3 It is a structural schematic diagram of the piston rod of the utility model.

[0023] In the figure: 1. piston rod; 11. connecting groove; 12. threaded joint; 13. reinforcement hole; 14. reinforcement ring; 15. flat bottom screw; 2. movable sliding plug; 21. first sealing groove; 22. first sealing ring; 23. second sealing groove; 24. second sealing ring; 25. buffer pad; 26. labyrinth groove. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0025] Example 1

[0026] like Figure 1-3As shown, the utility model provides a piston and piston rod connection structure of a hydraulic oil cylinder, including a piston rod 1, a movable sliding plug 2 is arranged at the bottom of the piston rod 1, a connecting groove 11 is opened at the center of the top of the movable sliding plug 2, a threaded joint 12 is fixedly connected to the position of the bottom of the piston rod 1 corresponding to the connecting groove 11, and the threaded joint 12 is threadedly connected to the inner wall of the connecting groove 11, a reinforcement ring 14 is fixedly connected to the position of the outer wall of the piston rod 1 close to the bottom, and reinforcement holes 13 are respectively opened at the positions around the top of the movable sliding plug 2, and the reinforcement ring 14 corresponds to the four reinforcement holes 1 3 are fixedly connected with the reinforcement hole 13 by the flat screw 15, the piston rod 1 is connected with the movable sliding plug 2 by setting the connecting groove 11 and the threaded joint 12, and then the flat screw 15 is inserted into the reinforcement hole 13 through the reinforcement ring 14 to perform secondary reinforcement. The stability of the connection between the piston rod 1 and the movable sliding plug 2 can ensure the stability of the installation of the movable sliding plug 2, avoid the problem of excessive wear on one side due to deviation, and lead to reduced sealing. The connection of the flat screw 15 is detachably connected with an anti-slip gasket to avoid loosening of the flat screw 15.

[0027] In this embodiment, the piston rod 1 is connected to the movable sliding plug 2 by providing a connecting groove 11 and a threaded joint 12, and then a flat bottom screw 15 is inserted through a reinforcement ring 14 in cooperation with the reinforcement hole 13 for secondary reinforcement. This ensures that the stability of the connection between the piston rod 1 and the movable sliding plug 2 can ensure the stability of the installation of the movable sliding plug 2, and avoids the problem of excessive wear on one side due to deviation, which leads to a decrease in sealing.

[0028] Example 2

[0029] like Figure 1-3 As shown, on the basis of Example 1, the utility model provides a technical solution: preferably, a first sealing groove 21 is opened near the top of the outer wall of the movable sliding plug 2, and a first sealing ring 22 is detachably connected to the inner wall of the first sealing groove 21; a second sealing groove 23 is opened near the bottom of the outer wall of the movable sliding plug 2, and a second sealing ring 24 is detachably connected to the second sealing groove 23; by arranging the first sealing ring 22 on the inner wall of the first sealing groove 21 and the second sealing ring 24 on the inner wall of the second sealing groove 23, the overall safety of the movable sliding plug 2 can be improved through the multi-stage sealing arrangement Sealing performance: there are two first sealing grooves 21, two first sealing rings 22, two second sealing grooves 23, two second sealing rings 24, a buffer pad 25 is fixedly connected to the bottom of the movable sliding plug 2, a labyrinth groove 26 is provided at the middle section of the outer wall of the movable sliding plug 2, and the labyrinth groove 26 is composed of multiple groups of annular grooves. By providing the labyrinth groove 26 at the middle section of the outer wall of the movable sliding plug 2, when the second sealing ring 24 wears and leaks, the labyrinth structure formed by the multiple groups of annular grooves of the labyrinth groove 26 can effectively delay the leakage of liquid in the hydraulic cylinder.

[0030] In this embodiment, by arranging a first sealing ring 22 on the inner wall of the first sealing groove 21 and a second sealing ring 24 on the inner wall of the second sealing groove 23, the overall sealing performance of the movable sliding plug 2 can be improved through the multi-stage sealing arrangement, and by arranging a labyrinth groove 26 at the middle section of the outer wall of the movable sliding plug 2, when the second sealing ring 24 wears and leaks, the labyrinth structure formed by the multiple groups of annular grooves in the labyrinth groove 26 can effectively delay the leakage of liquid in the hydraulic cylinder.

[0031] The working principle of the piston and piston rod connection structure of this hydraulic cylinder is described in detail below.

[0032] like Figure 1-3 As shown, when in use, the piston rod 1 is connected to the movable sliding plug 2 by setting a connecting groove 11 and a threaded joint 12, and then a flat bottom screw 15 is inserted into the reinforcement ring 14 in cooperation with the reinforcement hole 13 for secondary reinforcement, so that the stability of the connection between the piston rod 1 and the movable sliding plug 2 can ensure the stability of the installation of the movable sliding plug 2, and avoid the problem of excessive wear on one side due to deviation, resulting in reduced sealing performance. By setting a first sealing ring 22 on the inner wall of the first sealing groove 21 and a second sealing ring 24 on the inner wall of the second sealing groove 23, the overall sealing performance of the movable sliding plug 2 can be improved through a multi-stage sealing setting. By setting a labyrinth groove 26 at the middle section of the outer wall of the movable sliding plug 2, when the second sealing ring 24 wears and leaks, the labyrinth structure formed by the multiple groups of annular grooves in the labyrinth groove 26 can well delay the leakage of liquid in the hydraulic cylinder.

Claims

1. A piston and piston rod connection structure of a hydraulic cylinder, comprising a piston rod (1), characterized in that: A movable sliding plug (2) is provided at the bottom of the piston rod (1), a connecting groove (11) is provided at the center of the top of the movable sliding plug (2), a threaded joint (12) is fixedly connected to the position of the bottom of the piston rod (1) corresponding to the connecting groove (11), and the threaded joint (12) is threadedly connected to the inner wall of the connecting groove (11), a reinforcement ring (14) is fixedly connected to the outer wall of the piston rod (1) near the bottom, reinforcement holes (13) are respectively provided at the positions around the top of the movable sliding plug (2), and the positions of the reinforcement ring (14) corresponding to the four reinforcement holes (13) are fixedly connected to the reinforcement holes (13) by flat screws (15).

2. The piston and piston rod connection structure of a hydraulic cylinder according to claim 1, characterized in that: The connection points of the flat bottom screws (15) are respectively detachably connected with anti-skid pads.

3. The piston and piston rod connection structure of a hydraulic cylinder according to claim 1, characterized in that: A first sealing groove (21) is provided on the outer wall of the movable sliding plug (2) near the top, and a first sealing ring (22) is detachably connected to the inner wall of the first sealing groove (21). A second sealing groove (23) is provided on the outer wall of the movable sliding plug (2) near the bottom, and a second sealing ring (24) is detachably connected to the second sealing groove (23).

4. The piston and piston rod connection structure of a hydraulic cylinder according to claim 3, characterized in that: The number of the first sealing grooves (21) is two, the number of the first sealing rings (22) is two, the number of the second sealing grooves (23) is two, and the number of the second sealing rings (24) is two.

5. The piston and piston rod connection structure of a hydraulic cylinder according to claim 1, characterized in that: A buffer pad (25) is fixedly connected to the bottom of the movable sliding plug (2).

6. The piston and piston rod connection structure of a hydraulic cylinder according to claim 1, characterized in that: A labyrinth groove (26) is provided at the middle section of the outer wall of the movable sliding plug (2), and the labyrinth groove (26) is composed of a plurality of groups of annular grooves.

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