Double-acting lifting hydraulic cylinder

Abstract

The present invention relates to the technical field of hydraulic cylinders, and specifically relates to a double-lifting hydraulic cylinder. It includes a bottom plate, a first mounting plate and a second mounting plate. Between the first mounting plate and the second mounting plate, a first cylinder body and a second cylinder body are provided. The first cylinder body, the second cylinder body, the first mounting plate and the second mounting plate form a first hydraulic chamber and a second hydraulic chamber. A first piston ring is arranged in the first hydraulic chamber. Along the circumferential direction of the first piston ring, a plurality of first piston rods are arranged at intervals. The tops of the plurality of first piston rods are connected through a lifting plate. A second piston ring is arranged in the second hydraulic chamber. A second piston rod is coaxially arranged on the second piston ring. On the bottom plate, a first oil passage communicated with the first hydraulic chamber and a second oil passage communicated with the second hydraulic chamber are provided. In the present invention, through the independent design of the first hydraulic chamber and the second hydraulic chamber, and in cooperation with the coaxial arrangement of the first piston ring and the second piston ring, the lifting of two coaxial components can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic cylinders, and particularly to a double-lifting hydraulic cylinder. Background Art

[0002] Hydraulic jacks are widely used in the field of heavy machinery assembly. However, ordinary hydraulic jacks have only one lifting mechanism. In some assembly occasions of complex parts, multiple jacks need to be used in cooperation. As Figure 1 shown, a cone and a cone barrel are arranged inside the cylinder body. The cone barrel is threadedly connected to the inner surface of the cylinder body. The cone barrel has a conical surface that cooperates with the cone. The head of the cone extends downward to the lower part of the cone barrel and is threadedly connected to the fastening ring. When assembling this structure, due to the long length of the cylinder body, the cone cannot enter from the top of the cylinder body. Therefore, the first jack is first used to lift the cone into the cylinder body, and then multiple second jacks are arranged around the first jack to lift the cone barrel upward. Then, the cone barrel is threadedly connected to the cylinder body. After the cone barrel is fixed, the first jack and the second jacks are respectively relaxed to make the cone and the conical surface of the cone barrel cooperate. Finally, the fastening ring is threadedly connected to the head of the cone to complete the installation. However, during the installation process, since there are multiple second jacks, the consistency during the lifting process cannot be guaranteed, which in turn results in the cone barrel not being well coaxial with the cylinder body, and it is difficult to ensure the assembly accuracy. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a double-lifting hydraulic cylinder for realizing the simultaneous lifting of two components.

[0004] The technical solution adopted by the present invention to solve its technical problems is a double-lifting hydraulic cylinder, including a bottom plate. Above the bottom plate, there is a first mounting plate. Above the first mounting plate, there is a second mounting plate. A first cylinder body is arranged between the first mounting plate and the second mounting plate. A second cylinder body is coaxially arranged inside the first cylinder body. A first hydraulic chamber is formed among the first cylinder body, the second cylinder body, the first mounting plate and the second mounting plate. A second hydraulic chamber is formed among the second cylinder body, the first mounting plate and the second mounting plate. A first piston ring is arranged inside the first hydraulic chamber. A plurality of first piston rods are arranged at intervals along the circumferential direction of the first piston ring. The tops of the plurality of first piston rods are connected by a lifting plate. A second piston ring is arranged inside the second hydraulic chamber. A second piston rod is coaxially arranged on the second piston ring. The bottom plate is provided with a first oil passage communicating with the first hydraulic chamber and a second oil passage communicating with the second hydraulic chamber. The second mounting plate is provided with a first oil return port communicating with the first hydraulic chamber and a second oil return port communicating with the second hydraulic chamber.

[0005] Further, an oil inlet passage communicating with the first oil passage and the second oil passage is arranged inside the bottom plate. An inlet liquid port communicating with the first oil passage, the second oil passage and the oil inlet passage is arranged on the outer surface of the bottom plate.

[0006] Further, a first valve cavity located at the connection of the first oil passage and the inlet oil passage is provided on the upper surface of the bottom plate. A first valve core is arranged in the first valve cavity. A second valve cavity located at the connection of the second oil passage and the inlet oil passage is provided on the upper surface of the bottom plate. A second valve core is arranged in the second valve cavity. A shift ring is coaxially arranged above the bottom plate. An annular adjusting groove is provided on the lower surface of the shift ring. The bottom surface of the adjusting groove forms an acute angle with the horizontal plane. Valve stems that cooperate with the adjusting groove are fixedly arranged at the tops of both the first valve core and the second valve core. Further, the maximum distance between the two valve stems is the outer diameter of the adjusting groove.

[0007] Further, sealing rings are arranged on the outer surfaces of both the first valve core and the second valve core.

[0008] Further, a fixing disk is coaxially arranged at the bottom of the first mounting plate. The fixing disk is fixedly connected to the bottom plate. A plurality of limiting grooves are arranged on the outer peripheral surface of the fixing disk. The adjacent two limiting grooves are in arc transition. Limiting holes corresponding to the limiting grooves one by one are arranged on the inner surface of the shift ring. Limiting springs are arranged in the limiting holes. Limiting pins are arranged at the ends of the limiting springs. The ends of the limiting pins are abutted against the limiting grooves.

[0009] Further, a rotating hole is arranged on the outer surface of the shift ring.

[0010] Further, a plurality of first through holes are arranged along the circumferential direction of the first mounting plate. Second through holes corresponding to the first through holes one by one are arranged on the second mounting plate. Bolts sequentially pass through the first through holes and the second through holes and are locked by nuts.

[0011] Further, a positioning ring groove is arranged on the upper surface of the jacking plate.

[0012] The beneficial effects of the present invention are as follows: Through the independent design of the first hydraulic cavity and the second hydraulic cavity, and in cooperation with the coaxial arrangement of the first piston ring and the second piston ring, the jacking of two coaxial components can be realized, avoiding the problem of synchronization difference in the traditional cooperative operation of multiple jacks, and significantly improving the coaxiality and precision of the assembly.

[0013] The nested design of the first cylinder body and the second cylinder body and the linkage design of the first valve core, the second valve core and the shift ring are adopted, which simplifies the overall structure, reduces the need for external auxiliary equipment. At the same time, by rotating the shift ring to adjust the opening degrees of the first oil passage and the second oil passage, the precise control of the jacking speed can be realized. Description of the Drawings

[0014] Figure 1 is a schematic diagram of an existing complex part;

[0015] Figure 2 is a schematic diagram of the present invention;

[0016] Figure 3 is the front view of the present invention;

[0017] Figure 4 is the sectional view along the Figure 3 A-A plane in

[0018] Figure 5 is the schematic diagram of the connection between the dial ring and the fixed disk;

[0019] Figure 6 is Figure 5 the sectional view of B-B in

[0020] Figure 7 is Figure 5 the sectional view of C-C in

[0021] Figure 8 is the schematic diagram of the oil circuit on the bottom plate.

[0022] Reference numerals: 1-bottom plate; 2-first mounting plate; 3-second mounting plate; 4-first cylinder; 5-second cylinder; 6-first hydraulic chamber; 7-second hydraulic chamber; 8-first piston ring; 9-first piston rod; 10-lifting plate; 11-second piston ring; 12-second piston rod; 13-first oil circuit; 14-second oil circuit; 15-liquid inlet; 16-first valve chamber; 17-first spool; 18-second valve chamber; 19-second spool; 20-dial ring; 21-adjusting groove; 22-valve rod; 23-fixed disk; 24-limiting groove; 25-limiting hole; 26-limiting spring; 27-limiting pin; 28-rotating hole; 29-bolt; 30-nut; 31-first oil return port; 32-second oil return port; 33-positioning ring groove; 34-inlet oil circuit. Detailed Description of the Invention

[0023] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0024] As Figures 2 - 7As shown in the figure, the double-lifting hydraulic cylinder of the present invention includes a bottom plate 1. Above the bottom plate 1, there is a first mounting plate 2. Above the first mounting plate 2, there is a second mounting plate 3. Between the first mounting plate 2 and the second mounting plate 3, there is a first cylinder body 4. Inside the first cylinder body 4, a second cylinder body 5 is coaxially arranged. Between the first cylinder body 4, the second cylinder body 5, the first mounting plate 2 and the second mounting plate 3, a first hydraulic chamber 6 is formed. Between the second cylinder body 5, the first mounting plate 2 and the second mounting plate 3, a second hydraulic chamber 7 is formed. Inside the first hydraulic chamber 6, there is a first piston ring 8. Along the circumference of the first piston ring 8, a plurality of first piston rods 9 are arranged at intervals. The tops of the plurality of first piston rods 9 are connected by a lifting plate 10. Inside the second hydraulic chamber 7, there is a second piston ring 11. On the second piston ring 11, a second piston rod 12 is coaxially arranged. On the bottom plate 1, there is a first oil passage 13 communicating with the first hydraulic chamber 6 and a second oil passage 14 communicating with the second hydraulic chamber 7. On the second mounting plate 3, there is a first oil return port 31 communicating with the first hydraulic chamber 6 and a second oil return port 32 communicating with the second hydraulic chamber 7. The bottom plate 1, the first mounting plate 2, the second mounting plate 3, the first cylinder body 4 and the second cylinder body 5 are all made of steel. The first piston ring 8 divides the first hydraulic chamber 6 into upper and lower chambers. Hydraulic oil is injected into the lower chamber of the first hydraulic chamber 6 through the first oil passage 13. When the pressure of the hydraulic oil in the upper chamber of the first hydraulic chamber 6 reaches the design value, the hydraulic oil flows back to the hydraulic station through the first oil return port 31. The second piston ring 11 divides the second hydraulic chamber 7 into upper and lower chambers. Hydraulic oil is injected into the lower chamber of the second hydraulic chamber 7 through the second oil passage 14. When the pressure of the hydraulic oil in the upper chamber of the second hydraulic chamber 7 reaches the design value, the hydraulic oil flows back to the hydraulic station through the second oil return port 32. When the first hydraulic chamber 6 is pressurized, it pushes the first piston ring 8 and the first piston rods 9 arranged circumferentially thereon to move upward, driving the lifting plate 10 to lift the external workpiece. At the same time, the second hydraulic chamber 7 is pressurized to push the second piston ring 11, and another workpiece is lifted through the coaxial second piston rod 12.

[0025] Taking Figure 1 the parts shown as an example, the installation process is as follows. First, place the tapered cylinder and the cone on the lifting plate 10 at the same time. The second piston rod 12 is opposite to the head of the cone. At the same time, ensure that the tapered cylinder is coaxial with the cylinder body. The second oil passage 14 supplies oil to the second hydraulic chamber 7, pushing the cone to move upward. After moving to the installation position, make the cone stationary. Subsequently, the first oil passage 13 supplies oil to the first hydraulic chamber 6, pushing the tapered cylinder to move upward to the installation position. Then, rotate the tapered cylinder to be threadedly connected with the inner cavity of the cylinder body. After the installation of the tapered cylinder is completed, drive the first piston rod 9 and the second piston rod 12 to move downward, so that the conical surface of the cone and the conical surface of the tapered cylinder are fitted. The head of the cone moves to the lower part of the tapered cylinder. Then, threadedly connect the fastening ring with the head of the cone to complete the installation of the parts.

[0026] In the above embodiments, the first oil circuit 13 and the second oil circuit 14 are supplied with oil through two hydraulic stations, and the practicability is not good. Refer to Figure 3 and Figure 8 , further, an oil inlet passage 34 communicating with the first oil circuit 13 and the second oil circuit 14 is provided in the bottom plate 1, and a liquid inlet 15 communicating with the oil inlet passage 34, the first oil circuit 13 and the second oil circuit 14 is provided on the outer surface of the bottom plate 1. The liquid inlet 15 is communicated with a hydraulic station to realize oil supply.

[0027] In order to adjust the flow rates of the first oil circuit 13 and the second oil circuit 14, and further adjust the jacking rates of the first piston rod 9 and the second piston rod 12, further, refer to Figures 4 - 8, a first valve cavity 16 is provided on the upper surface of the bottom plate 1 at the connection of the first oil passage 13 and the oil inlet passage 34. A first valve core 17 is arranged in the first valve cavity 16. A second valve cavity 18 is provided on the upper surface of the bottom plate 1 at the connection of the second oil passage 14 and the oil inlet passage 34. A second valve core 19 is arranged in the second valve cavity 18. A dial ring 20 is coaxially arranged above the bottom plate 1. An annular adjusting groove 21 is provided on the lower surface of the dial ring 20. The depth of the adjusting groove 21 changes gradually. The bottom surface of the adjusting groove 21 forms an acute angle with the horizontal plane. The tops of the first valve core 17 and the second valve core 19 are both fixedly provided with valve rods 22 that cooperate with the adjusting groove 21. During use, hydraulic oil enters the oil inlet passage 34 through the liquid inlet 15, and then enters the first valve cavity 16 and the second valve cavity 18. After reaching a certain pressure, the first valve core 17 in the first valve cavity 16 and the second valve core 19 in the second valve cavity 18 will be lifted, realizing the conduction of the first oil passage 13 and the second oil passage 14. The shape of the bottom surface of the adjusting groove 21 is a spatial ellipse. The bottom surface of the adjusting groove 21 is an inclined plane, forming an acute angle with the horizontal plane, that is, the same as the cross-sectional shape formed after the cylinder is obliquely cut. The position where the adjusting groove 21 is at the maximum distance from the lower surface of the dial ring 20 is opposite to the position where the adjusting groove 21 is at the minimum distance from the lower surface of the dial ring 20. The up and down movement of the first valve core 17 can adjust the opening degree of the first oil passage 13. When the first valve core 17 is at the highest position, the first oil passage 13 is fully opened. When the first valve core 17 is at the lowest position, the first oil passage 13 is closed. The up and down movement of the second valve core 19 can adjust the opening degree of the second oil passage 14. When the second valve core 19 is at the highest position, the second oil passage 14 is fully opened. When the second valve core 19 is at the lowest position, the second oil passage 14 is closed. By rotating the dial ring 20, the inclined bottom surface of the adjusting groove 21 will push the valve rod 22 up and down, thereby controlling the up and down positions of the first valve core 17 and the second valve core 19. The position of the first valve core 17 determines the flow rate of the first oil passage 13, and the position of the second valve core 19 determines the flow rate of the second oil passage 14, thereby adjusting the jacking rates of the first piston rod 9 and the second piston rod 12. It should also be noted here that the difference in the flow rates of the hydraulic oil entering the first hydraulic cavity 6 and the second hydraulic cavity 7 will cause a difference in the jacking heights of the first piston rod 9 and the second piston rod 12, so that an operating space can be formed between the workpiece jacked by the first piston rod 9 and the workpiece jacked by the second piston rod 12, thereby realizing the jacking and installation of two coaxial parts.

[0028] In order to achieve the maximum difference in the flow rates of the first oil passage 13 and the second oil passage 14, further, refer to Figure 4The line connecting the projections of the center lines of the two valve stems 22 on a horizontal plane passes through the center of the projection of the adjusting groove 21 on the horizontal plane. As the dial ring 20 rotates, when the first valve core 17 is at its lowest position, the second valve core 19 is at its highest position, resulting in the first oil circuit 13 having its minimum opening, or even completely closed, and the second oil circuit 14 having its maximum opening. When the second valve core 19 is at its lowest position, the first valve core 17 is at its highest position, resulting in the second oil circuit 14 having its minimum opening, or even completely closed, and the first oil circuit 13 having its maximum opening. This allows the first hydraulic chamber 6 or the second hydraulic chamber 7 to be used independently. The deepest and shallowest positions of the adjusting groove 21 can also be marked on the dial ring 20 to facilitate adjustment of the openings of the first and second oil circuits 13, 14 during use.

[0029] To prevent hydraulic oil from overflowing, sealing rings are further provided on the outer surfaces of the first valve core 17 and the second valve core 19. The presence of the sealing rings ensures the airtightness between the first valve core 17 and the first valve cavity 16, and between the second valve core 19 and the second valve cavity 18, thereby preventing hydraulic oil from overflowing.

[0030] In order to understand the angle of rotation of the dial ring 20; Figures 5 - 7 Furthermore, a fixed plate 23 is coaxially provided at the bottom of the first mounting plate 2, and the fixed plate 23 is fixedly connected to the bottom plate 1. A plurality of limiting grooves 24 are provided on the outer peripheral surface of the fixed plate 23, and a circular arc transition is provided between two adjacent limiting grooves 24. The inner surface of the shifting ring 20 is provided with limiting holes 25 corresponding to the limiting grooves 24 one by one, and a limiting spring 26 is provided in the limiting hole 25. A limiting pin 27 is provided at the end of the limiting spring 26, and the end of the limiting pin 27 abuts against the limiting groove 24. The welding or bolted connection between the fixed disk 23 and the base plate 1 further enhances the stability of the structure and prevents displacement during the jacking process. When the dial ring 20 rotates, the limit pin 27 slides along the limit groove 24 on the fixed disk 23 under the action of the limit spring 26. Every time it slides to the arc transition position of the limit groove 24, a "click" feedback will be generated to ensure the stage-by-stage and controllable nature of the adjustment process. The corresponding central angle between two adjacent limit grooves 24 is 30°, 45° or 60°, so that the rotation angle of the dial ring 20 can be understood by the number of "click" sounds.

[0031] In order to facilitate the rotation of the dial ring 20, further see Figure 6 The outer surface of the dial ring 20 is provided with a rotation hole 28. The rotation hole 28 is a hexagonal hole or a round hole. During the dialing process, the pin can be inserted into the rotation hole 28 to increase the lever arm.

[0032] In order to ensure the stability of the first hydraulic chamber 6 and the second hydraulic chamber 7, further see Figure 2, a plurality of first through holes are provided along the circumferential direction of the first mounting plate 2, and second through holes corresponding to the first through holes one by one are provided on the second mounting plate 3. Bolts 29 sequentially pass through the first through holes and the second through holes and are locked by nuts 30. The first mounting plate 2 and the second mounting plate 3 are fixed by the circumferentially arranged first through holes and second through holes by bolts 29 and nuts 30 to ensure the overall rigidity.

[0033] In order to better realize the positioning of the workpiece, further, a positioning ring groove 33 is provided on the upper surface of the jacking plate 10.

[0034] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. Double lifting hydraulic cylinder, including a bottom plate (1), characterized in that: Above the bottom plate (1), a first mounting plate (2) is provided. Above the first mounting plate (2), a second mounting plate (3) is provided. Between the first mounting plate (2) and the second mounting plate (3), a first cylinder (4) is provided. Inside the first cylinder (4), a second cylinder (5) is coaxially arranged. Between the first cylinder (4), the second cylinder (5), the first mounting plate (2) and the second mounting plate (3), a first hydraulic chamber (6) is formed. Between the second cylinder (5), the first mounting plate (2) and the second mounting plate (3), a second hydraulic chamber (7) is formed. Inside the first hydraulic chamber (6), a first piston ring (8) is provided. Along the circumferential direction of the first piston ring (8), a plurality of first piston rods (9) are arranged at intervals. The tops of the plurality of first piston rods (9) are connected by a jacking plate (10). Inside the second hydraulic chamber (7), a second piston ring (11) is provided. On the second piston ring (11), a second piston rod (12) is coaxially arranged. On the bottom plate (1), a first oil passage (13) communicating with the first hydraulic chamber (6) and a second oil passage (14) communicating with the second hydraulic chamber (7) are provided. On the second mounting plate (3), a first oil return port (31) communicating with the first hydraulic chamber (6) and a second oil return port (32) communicating with the second hydraulic chamber (7) are provided; Inside the bottom plate (1), an oil inlet passage (34) communicating with the first oil passage (13) and the second oil passage (14) is provided. On the outer surface of the bottom plate (1), a liquid inlet (15) communicating with the oil inlet passage (34) is provided; On the upper surface of the bottom plate (1), a first valve chamber (16) is provided at the connection of the first oil passage (13) and the oil inlet passage (34). Inside the first valve chamber (16), a first valve core (17) is provided. On the upper surface of the bottom plate (1), a second valve chamber (18) is provided at the connection of the second oil passage (14) and the oil inlet passage (34). Inside the second valve chamber (18), a second valve core (19) is provided. Above the bottom plate (1), a dial ring (20) is coaxially arranged. On the lower surface of the dial ring (20), an annular adjusting groove (21) is provided. The depth of the adjusting groove (21) changes gradually. On the tops of both the first valve core (17) and the second valve core (19), valve stems (22) cooperating with the adjusting groove (21) are fixedly provided.

2. The double-acting lifting hydraulic cylinder according to claim 1, characterized in that: The connection line between the projections of the centerlines of the two valve stems (22) on the horizontal plane passes through the center of the projection of the adjusting groove (21) on the horizontal plane.

3. The double-acting lifting hydraulic cylinder according to claim 1, characterized in that: Sealing rings are provided on the outer surfaces of both the first valve core (17) and the second valve core (19).

4. The double lifting hydraulic cylinder according to claim 1, characterized in that: A fixed disk (23) is coaxially arranged at the bottom of the first mounting plate (2), and the fixed disk (23) is fixedly connected to the bottom plate (1). A plurality of limiting grooves (24) are arranged on the outer peripheral surface of the fixed disk (23), and a circular arc transition is formed between two adjacent limiting grooves (24). The inner surface of the dial ring (20) is provided with limiting holes (25) corresponding to the limiting grooves (24) one by one, and a limiting spring (26) is arranged in the limiting hole (25). A limiting pin (27) is provided at the end of the limiting spring (26), and the end of the limiting pin (27) is in contact with the limiting groove (24).

5. The double-acting lifting hydraulic cylinder according to claim 4, wherein: The outer surface of the shifting ring (20) is provided with a rotation hole (28).

6. The double-acting lifting hydraulic cylinder according to claim 1, wherein: The first mounting plate (2) is provided with a plurality of first through holes along its circumference, and the second mounting plate (3) is provided with second through holes corresponding one to one to the first through holes, and the bolts (29) pass through the first through holes and the second through holes in sequence and are locked by nuts (30).

7. The double lifting hydraulic cylinder according to claim 1, characterized in that: A positioning ring groove (33) is provided on the upper surface of the lifting plate (10).

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