Helical oscillating cylinder with axial force compensation function

Abstract

The application discloses a spiral swing oil cylinder with axial force compensation function, which comprises a cylinder body, connecting pipe heads are arranged on the side walls of the two ends of the cylinder body, a rotating shaft part is horizontally arranged in the cylinder body, the two ends of the cylinder body are rotationally connected with the end parts of the rotating shaft part, a piston block is slidably arranged in the cylinder body, the piston block is connected with the rotating shaft part, and an axial force compensation mechanism is arranged between the piston block and the cylinder body. When the piston block in the cylinder body moves axially to a side, the oil pressure of the pressure increasing side causes the corresponding connecting pipe head to move to the outside of the cylinder body, so that the corresponding power-on button switch is pressed, the annular electromagnet in the movement direction of the piston block is powered on, magnetic force is generated to the piston block for magnetic attraction, so that the axial force compensation is realized.

Description

Technical Field

[0001] This invention relates to the field of helical swing cylinder technology, and more specifically to a helical swing cylinder with axial force compensation function. Background Technology

[0002] Swing cylinders mainly include vane type, gear rack type and helical type, which are widely used in industry. Among them, the helical swing cylinder is a type of cylinder that uses helical spline meshing to transmit motion. This type of cylinder has the advantages of small size, light weight and compact structure.

[0003] The existing helical swing cylinder with axial force compensation function, patent authorization announcement number CN106151151B, includes: end cover, roller bearing, joint, cylinder body, piston, shaft, and sealing ring; the piston engages with the multi-start inner helix of the cylinder body through its outer multi-start outer helix, and engages with the multi-start outer helix of the output shaft through its inner multi-start inner helix; one end of the piston is clearance-fitted with the cylinder body and uses a seal to separate the two cavities of the cylinder body, and the other end is clearance-fitted with the output shaft and uses a seal to separate the two cavities of the output shaft. The axial force compensation cavity eliminates the additional axial force during the double helix pair transmission to improve transmission efficiency, and can output a large torque in a small space. However, the shortcomings of this patent are: although the technical solution can rely on the set axial force compensation cavity for axial force compensation, its compensation effect is generally poor. This is because the piston itself, the cylinder body, and the shaft are all threaded, and there are components such as the set sealing ring. During axial movement, a part of the axial force still needs to be consumed to overcome the resistance. Relying solely on the consistency of the axial force compensation cavity and the piston cavity oil pressure for compensation is not effective enough. Summary of the Invention

[0004] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide a helical swing cylinder with axial force compensation function.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A helical oscillating cylinder with axial force compensation function includes a cylinder body. Connecting pipes are provided on both end sidewalls of the cylinder body. A rotating shaft is horizontally disposed inside the cylinder body, and both ends of the cylinder body are rotatably connected to the ends of the rotating shaft. A piston block is slidably disposed inside the cylinder body, and the piston block is connected to the rotating shaft. An axial force compensation mechanism is provided between the piston block and the cylinder body. The axial force compensation mechanism includes two annular electromagnets, which are respectively connected to the inner sides of both ends of the cylinder body. Both sides of the piston block are connected to corresponding... The piston block has an iron ring aligned with the annular electromagnet. Sliding resistance mechanisms electrically connected to the corresponding annular electromagnet are provided on both sides of the piston block. A power switch assembly electrically connected to the corresponding annular electromagnet is provided between the two connecting pipe heads and the cylinder body. Each power switch assembly includes a connecting slide cavity, which is formed on the inner wall of the cylinder body. The connecting pipe head is inserted into the corresponding connecting slide cavity. A rubber piston component slidably connected to the connecting slide cavity is connected to the bottom end of the connecting pipe head. A power button switch electrically connected to the corresponding annular electromagnet is connected to the top of the connecting slide cavity.

[0007] As a further aspect of the present invention: a connecting spring is connected between the rubber piston and the top of the corresponding connecting slide cavity.

[0008] As a further aspect of the present invention: the rotating shaft includes a threaded section shaft and a smooth section shaft, the threaded section shaft and the smooth section shaft are coaxially connected, and the threaded section shaft is threadedly connected to the piston block.

[0009] As a further aspect of the present invention: the piston block is provided with a sliding sealing assembly that is connected to the smooth section shaft. The sliding sealing assembly includes a sleeve, which is coaxially connected to the piston block. The smooth section shaft passes through the sleeve, and the inner diameter of the sleeve is larger than the outer diameter of the threaded section shaft. A third sealing ring is connected to the inner wall of the end of the sleeve, and the third sealing ring is attached to the smooth section shaft.

[0010] As a further aspect of the present invention: both ends of the cylinder are provided with sealing rotation assemblies, and both ends of the cylinder are rotatably connected to the ends of the rotating shaft through the sealing rotation assemblies.

[0011] As a further aspect of the present invention: the sealing rotation assembly includes an end cap, the end cap being connected to the cylinder body, a first sealing ring being provided between the end cap and the cylinder body, and a bearing being connected to the end cap for rotatable connection with the corresponding end of the rotating shaft.

[0012] As a further aspect of the present invention: the sliding resistance mechanism includes two linkage slide rods, which are respectively horizontally connected to both sides of the piston block. The two linkage slide rods slide through the corresponding end caps. Each end cap on both sides of the cylinder is connected to a sliding rheostat electrically connected to the corresponding annular electromagnet. A variable resistance slider is slidably mounted on the variable resistance slider, and the variable resistance slider is connected to the corresponding linkage slide rod.

[0013] As a further aspect of the present invention: a sealing telescopic sleeve is connected between the linkage slide rod and the end cap, and the sealing telescopic sleeve is fitted onto the linkage slide rod.

[0014] As a further aspect of the present invention: a wire hole is provided on the cylinder body, a power line passing through the wire hole is connected to the annular electromagnet, and a sealing glue column is connected between the wire hole and the power line.

[0015] The beneficial effects of this invention are:

[0016] 1. When the piston block in the cylinder of the present invention moves axially to one side, the oil pressure on the boosting side causes the corresponding connecting pipe head to move out of the cylinder, so that the corresponding energized button switch is pressed. In this way, the annular electromagnet in the direction of piston block movement is energized, generating a magnetic attraction on the piston block to achieve axial force compensation.

[0017] 2. During the process of the piston block moving closer to the energized annular electromagnet, the corresponding sliding rheostat changes resistance as the piston block moves, causing the current passing through the annular electromagnet to change. That is, when the distance between the annular electromagnet and the piston block shortens, the current decreases accordingly, which is used to stabilize the magnetic attraction between the two and avoid the magnetic force from becoming stronger due to the smaller distance, thus affecting the stability of the piston block's movement. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 yes Figure 1 Enlarged structural diagram at point A;

[0021] Figure 3 This is a right-side structural schematic diagram of the piston block in this invention;

[0022] Figure 4 This is a right-side cross-sectional view of the structure in which the annular electromagnet and the cylinder body are connected in this invention.

[0023] In the diagram: 1. Cylinder body; 2. Piston block; 3. Rotating shaft; 4. Threaded section shaft; 5. Smooth section shaft; 6. Sleeve; 7. Iron ring; 8. Connecting pipe end; 9. Sliding rheostat; 10. Rheostat slider; 11. Linkage slide rod; 12. Second sealing ring; 13. Third sealing ring; 14. End cap; 15. Bearing; 16. First sealing ring; 17. Ring electromagnet; 18. Connecting slide cavity; 19. Power button switch; 20. Connecting spring; 21. Rubber piston; 22. Sealing telescopic sleeve; 23. Sealing rubber column; 24. Power cord; 25. Wire hole. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] like Figures 1-4 As shown, a spiral swing cylinder with axial force compensation function includes a cylinder body 1. Connecting pipe heads 8 are provided on both ends of the side wall of the cylinder body 1. The connecting pipe heads 8 facilitate the entry and exit of oil in the cylinder body 1. An oil delivery pump assembly can be connected between the two connecting pipe heads 8 to drive the oil to flow. A rotating shaft 3 is horizontally arranged inside the cylinder body 1. Sealing rotating assemblies are provided at both ends of the cylinder body 1. The two ends of the cylinder body 1 are rotatably connected to the ends of the rotating shaft 3 through the sealing rotating assemblies. The sealing rotating assembly includes an end cover 14. The end cover 14 is fixedly connected to the cylinder body 1 by screws. A first sealing ring 16 for sealing is provided between the end cover 14 and the cylinder body 1. A bearing 15 that is rotatably connected to the corresponding end of the rotating shaft 3 is fixedly installed on the end cover 14.

[0026] A piston block 2 is slidably disposed inside the cylinder body 1. A second sealing ring 12 is fitted onto the piston block 2, and the second sealing ring 12 fits against the inner wall of the cylinder body 1, serving as a sealing barrier to prevent communication between the cavities on both sides of the piston block 2. The piston block 2 is connected to a rotating shaft 3. The rotating shaft 3 includes a threaded section shaft 4 and a smooth section shaft 5, which are coaxially connected. The threaded section shaft 4 passes through the piston block 2 and is threadedly connected to it. It should be noted that the connection between the piston block 2 and the threaded section shaft 4 is consistent with the connection between the piston block 2 and the ball screw assembly. With the same connection, linear motion can be converted into helical motion. The piston block 2 is provided with a sliding sealing assembly that is connected to the smooth section shaft 5. The sliding sealing assembly includes a sleeve 6, which is coaxially fixedly connected to the piston block 2. The smooth section shaft 5 passes through the sleeve 6. The inner diameter of the sleeve 6 is larger than the outer diameter of the threaded section shaft 4 to avoid contact friction between the two. A third sealing ring 13 is installed on the inner wall of the end of the sleeve 6. The third sealing ring 13 slides against the smooth section shaft 5 to play a sealing role, and at the same time facilitates the movement of the piston block 2 relative to the entire rotating shaft 3.

[0027] An axial force compensation mechanism is provided between the piston block 2 and the cylinder body 1. The axial force compensation mechanism includes two annular electromagnets 17, which are fixedly connected to the inner sides of both ends of the cylinder body 1. A wire hole 25 is provided on the cylinder body 1. A power line 24 is connected to the annular electromagnet 17 and passes through the wire hole 25. A sealing post 23 is connected between the wire hole 25 and the power line 24 to provide a seal. Iron rings 7 aligned with the corresponding annular electromagnets 17 are fitted and installed on both sides of the piston block 2. A sliding resistance mechanism electrically connected to the corresponding annular electromagnet 17 is provided on both sides of the piston block 2. The sliding resistance mechanism includes two linkage slide rods 11, which are horizontally fixedly connected to both sides of the piston block 2. The two linkage slide rods 11 slide... The piston block 2 passes through the corresponding end cap 14. A sealing telescopic sleeve 22 is connected between the linkage slide rod 11 and the end cap 14. The sealing telescopic sleeve 22 is fitted on the linkage slide rod 11 and is used to seal the position where the linkage slide rod 11 passes through the end cap 14. A sliding rheostat 9 electrically connected to the corresponding annular electromagnet 17 is fixedly installed on the end caps 14 on both sides of the cylinder body 1. A variable resistance slider 10 is slidably mounted on the sliding rheostat 9. The variable resistance slider 10 changes the resistance value during the sliding process. When the variable resistance slider 10 slides to the end close to the cylinder body 1, the resistance value of the circuit where the corresponding annular electromagnet 17 is located decreases. The variable resistance slider 10 is fixedly connected to the corresponding linkage slide rod 11. During the sliding process of the piston block 2, the corresponding variable resistance slider 10 is driven to slide through the linkage slide rod 11 to realize the variable resistance.

[0028] Each of the two connecting pipe ends 8 is equipped with an energizing switch assembly electrically connected to the corresponding annular electromagnet 17 between it and the cylinder body 1. It should be noted that the annular electromagnet 17, power line 24, and sliding rheostat 9 on the same side, and the energizing switch assembly on the opposite side, are connected in series on the same circuit. It should also be noted that the energizing switch assembly at the left end of the cylinder body 1 and the annular electromagnet 17 on the inner side of the right end of the cylinder body 1 are on opposite sides, but are electrically connected together. The energizing switch assembly includes a connecting slide cavity 18, which is formed on the inner wall of the cylinder body 1, connecting... The pipe head 8 is inserted into the corresponding connecting slide cavity 18. The bottom end of the connecting pipe head 8 is fixedly connected to a rubber piston 21 that is slidably connected to the connecting slide cavity 18. That is, the connecting pipe head 8 can slide relative to the cylinder body 1. Thus, when the connecting pipe head 8 is connected to the corresponding oil delivery pump body assembly, it needs to be connected through a hose or telescopic tube to avoid hindering its movement. A connecting spring 20 is connected between the rubber piston 21 and the top of the corresponding connecting slide cavity 18. A power-on button switch 19 that is electrically connected to the corresponding annular electromagnet 17 is installed on the top of the connecting slide cavity 18.

[0029] The working principle of this invention: the connecting pipe 8 on one side of the cylinder body 1 outputs oil outward, and the connecting pipe 8 on the other side draws in oil inward. As a result, the oil pressure inside the cavity at the oil output end of the cylinder body 1 decreases, while the oil pressure in the cavity at the oil input end increases. This facilitates the piston block 2 to slide from the high oil pressure side to the low oil pressure side by relying on the oil pressure difference. During the sliding process of the piston block 2, since the piston block 2 is threadedly connected to the threaded section shaft 4 of the rotating shaft 3, the rotating shaft 3 achieves threaded rotation. When the piston block 2 moves to the inner end position of the cylinder body 1, the oil inlet and outlet of the two connecting pipes 8 switch, thereby causing the piston block 2 to move in the opposite direction. In this way, reciprocating motion can be achieved, which facilitates the swinging of the component connected to the end of the rotating shaft 3.

[0030] When the hydraulic pressure in the cavity at one end of the cylinder 1 increases, the rubber piston 21 connected to the bottom of the connecting pipe 8 in that cavity slides upward relative to the connecting slide cavity 18 due to the hydraulic pressure, and finally presses against the energizing button switch 19 at its location. The energizing button switch 19 then energizes the annular electromagnet 17 in the direction in which the piston block 2 slides closer. Since the piston block 2 is provided with an iron ring 7, it generates a magnetic attraction on the piston block 2, thereby generating axial force compensation for the piston block 2. During the sliding process of the piston block 2, the corresponding linkage slide rod 11 pushes the connected variable resistance slide head 10 from the minimum resistance end to the maximum resistance end of the sliding rheostat 9. As a result, the current in the energized annular electromagnet 17 decreases, thereby causing the magnetic intensity generated by the annular electromagnet 17 to gradually decrease. As the piston block 2 gradually approaches the annular electromagnet 17, the magnetic attraction between the piston block 2 and the corresponding annular electromagnet 17 can be stabilized during the movement of the piston block 2, that is, the compensation force is stable, avoiding the situation where the magnetic force is constant and the moving speed of the piston block 2 gradually increases, causing unstable operation.

[0031] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A spiral swing oil cylinder with axial force compensation function, comprising a cylinder body (1), a connecting pipe head (8) is arranged on the end side wall of the cylinder body (1), a rotating shaft piece (3) is horizontally arranged in the cylinder body (1), the end of the cylinder body (1) is rotatably connected with the end of the rotating shaft piece (3), a piston block (2) is slidably arranged in the cylinder body (1), the piston block (2) is connected with the rotating shaft piece (3), an axial force compensation mechanism is arranged between the piston block (2) and the cylinder body (1), characterized in that, The axial force compensation mechanism comprises annular electromagnets (17), two of which are arranged on the inner sides of the two ends of the cylinder body (1), and the two sides of the piston block (2) are connected with iron rings (7) aligned with the corresponding annular electromagnets (17), and the two sides of the piston block (2) are provided with sliding rheostats electrically connected with the corresponding annular electromagnets (17), and the two connecting pipe heads (8) and the cylinder body (1) are provided with power-on switch groups electrically connected with the corresponding annular electromagnets (17), the power-on switch group comprises a connecting sliding cavity (18) opened on the inner wall of the cylinder body (1), the connecting pipe head (8) is inserted in the corresponding connecting sliding cavity (18), the bottom end of the connecting pipe head (8) is connected with a rubber piston piece (21) in sliding connection with the connecting sliding cavity (18), and the top of the connecting sliding cavity (18) is connected with a power-on button switch (19) electrically connected with the corresponding annular electromagnet (17).

2. The helical oscillating cylinder with axial force compensation function according to claim 1, characterized in that, The rubber piston piece (21) is connected with the top of the corresponding connecting sliding cavity (18) by a connecting spring (20).

3. The helical oscillating cylinder with axial force compensation function according to claim 1, characterized in that, The rotating shaft piece (3) comprises a threaded segment shaft body (4) and a smooth segment shaft body (5), the threaded segment shaft body (4) and the smooth segment shaft body (5) are coaxially connected, and the threaded segment shaft body (4) is threadedly connected with the piston block (2).

4. The helical oscillating cylinder with axial force compensation function according to claim 3, characterized in that, The piston block (2) is provided with a sliding sealing assembly matched with the smooth segment shaft body (5), the sliding sealing assembly comprises a sleeve (6) coaxially connected with the piston block (2), the smooth segment shaft body (5) penetrates the sleeve (6), the inner diameter of the sleeve (6) is larger than the outer diameter of the threaded segment shaft body (4), and the end inner wall of the sleeve (6) is connected with a third sealing ring (13) abutting against the smooth segment shaft body (5).

5. The helical oscillating cylinder with axial force compensation function according to claim 1, characterized in that, Both ends of the cylinder body (1) are provided with sealing rotating assemblies, and both ends of the cylinder body (1) are rotatably connected with the end portions of the rotating shaft piece (3) through the sealing rotating assemblies.

6. The helical oscillating cylinder with axial force compensation function according to claim 5, characterized in that, The sealing rotating assembly comprises an end cover (14) connected with the cylinder body (1), and a first sealing ring (16) is arranged between the end cover (14) and the cylinder body (1), and a bearing (15) rotatably connected with the corresponding end portion of the rotating shaft piece (3) is connected to the end cover (14).

7. The helical oscillating cylinder with axial force compensation function according to claim 6, characterized in that, The sliding rheostat mechanism comprises linkage sliding rods (11), two of which are horizontally connected to the two sides of the piston block (2), and the two linkage sliding rods (11) are respectively slidably penetrated through the corresponding end covers (14), and the end covers (14) on the two sides of the cylinder body (1) are respectively connected with sliding rheostats (9) electrically connected with the corresponding annular electromagnets (17), and a variable resistance sliding head (10) is slidably arranged on the sliding rheostat (9), and the variable resistance sliding head (10) is connected with the corresponding linkage sliding rod (11).

8. The helical oscillating cylinder with axial force compensation function according to claim 7, characterized in that, A sealing telescopic sleeve (22) is connected between the linkage slide rod (11) and the end cover (14) and is sleeved on the linkage slide rod (11).

9. The helical oscillating cylinder with axial force compensation function according to claim 1, characterized in that, A wire hole (25) is formed in the cylinder body (1), a power line (24) is connected to the annular electromagnet (17) and penetrates through the wire hole (25), and a blocking rubber column (23) is connected between the wire hole (25) and the power line (24).

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