Air cylinder

Abstract

The air cylinder comprises a cylinder body, a first shaft and a piston piece, the outer circumferential wall of the piston piece is matched with the inner circumferential wall of the cylinder body, a plane perpendicular to the axis of the first shaft is defined as a first plane, a line where the first plane intersects with the outer circumferential wall of the piston piece is defined as a first line, the first plane is defined to be provided with a first point, and the first point is defined to be provided with a second point. The first point is located on the axis of the first shaft and is defined, the first line is provided with a second point and a third point, the distance between the first point and the second point is L1, the distance between the first point and the third point is L2, L1 is not equal to L2, when the piston piece moves, rotation of the piston piece can be limited through the inner circumferential wall of the cylinder body, and the risk of inner leakage of the air cylinder is reduced.

Description

Technical Field

[0001] The present invention relates to the field of drive technology, in particular to a cylinder. Background Art

[0002] The cam is an air filter according to claim 1, wherein the piston is mounted on the support frame and the piston is engaged with the piston rod, the piston being mounted on the support frame and the roller being rotatable on the piston. The cam is provided with a first support rod and a second support rod, the first support rod and the second support rod being located on opposite sides of the support frame, the first support rod passing through the piston, the second support rod passing through the piston, the two ends of the first support rod being connected to the front end cover by screws, and the two ends of the second support rod being connected to the rear end cover by screws. The piston moves between the front end cover and the rear end cover under the push of gas. Since the first support rod passes through the piston and the second support rod passes through the piston, the piston only moves but does not rotate. Under the cooperation of the roller and the spiral groove, the rotating shaft rotates.

[0003] Since the first support rod and the second support rod are passed through the piston to limit the rotation of the piston, in order to reduce the amount of gas on one side of the piston flowing into the other side of the piston through the gap between the piston and the first support member and the second support member during the operation of the cylinder, that is, to reduce the internal leakage of the cylinder, the first support member and the second support member are both provided with sealing members to seal the gap between the first support member, the second support member and the piston member. However, since the piston needs to move relative to the first support member and the second support member, the internal leakage of the cylinder needs to be further reduced. Summary of the invention

[0004] The present invention provides a cylinder, which includes a cylinder body, a first end cover assembly, a first shaft, a piston assembly and a second end cover assembly. The first end cover assembly includes a first cover, which is located at one end of the cylinder body. The second end cover includes a second cover, which is located at the other end of the cylinder body. The first shaft passes through the second cover. The piston assembly includes a piston member and a first member. The outer peripheral wall of the piston member is adapted to the inner peripheral wall of the cylinder body. The piston member has a first installation cavity. The first member is rotatably arranged in the first installation cavity. The piston member is sleeved on the first shaft. The first shaft has a spiral slideway, and a part of the first member cooperates with the spiral slideway. It is defined that a surface perpendicular to the axis of the first shaft is a first surface, and a line intersecting the first surface with the outer peripheral wall of the piston member is a first line. It is defined that the first surface has a first point, and the first point is located on the axis of the first shaft. It is defined that the first line has a second point and a third point. The distance between the first point and the second point is L1, and the distance between the first point and the third point is L2, and L1≠L2.

[0005] The cylinder provided by the present invention includes a cylinder body, a first axis and a piston member, the outer circumferential wall of the piston member is adapted to the inner circumferential wall of the cylinder body, and it is defined that the surface perpendicular to the axis of the first axis is the first surface, and the line intersecting the first surface and the outer circumferential wall of the piston member is the first line. It is defined that the first surface has a first point, and the first point is located on the axis of the first axis. It is defined that the first line has a second point and a third point, and the distance between the first point and the second point is L1, and the distance between the first point and the third point is L2, L1≠L2, and when the piston member moves, the rotation of the piston member can be restricted by the inner circumferential wall of the cylinder body to reduce the risk of leakage in the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of a cylinder of the present invention;

[0007] Figure 2 for Figure 1 A cross-sectional schematic diagram of the piston of the middle cylinder being in a first position;

[0008] Figure 3 for Figure 2 Schematic cross-sectional view along the AA direction;

[0009] Figure 4 for Figure 2 A partial schematic diagram of part A;

[0010] Figure 5 for Figure 2 A partial schematic diagram of part B in the middle;

[0011] Figure 6 for Figure 2 A partial schematic diagram of part C in the middle;

[0012] Figure 7 for Figure 3 A partial schematic diagram of part D in the middle;

[0013] Figure 8 for Figure 1 Another schematic cross-sectional view of the middle cylinder;

[0014] Fig. 9 for Figure 8 A schematic cross-sectional view of the piston of the middle cylinder in the second position.

[0015] Reference numerals:

[0016] Cylinder body 1, first matching portion 11, first middle portion 12, second middle portion 13, second matching portion 14,

[0017] The first cover 21, the first mounting portion 211, the first fixing portion 212, the first external interface 213,

[0018] The first shaft 3, the spiral slide 31, the first spiral portion 32, the first support portion 33, the second support portion 34,

[0019] Piston member 51, first mounting cavity 511, first sliding portion 512, first connecting portion 513, second sliding portion 514, first mounting groove 515, first member 52, first sealing member 53, first mounting sleeve 54, first bearing 55, first retaining ring 56, second member 57, first main body portion 571, first protruding portion 572, second protruding portion 573, second sealing member 58, fourth member 60,

[0020] The second cover 61, the second mounting portion 611, the second fixing portion 612, the second external interface 613,

[0021] A first line 7 , a first connecting rod 8 , a third piece 9 , a fourth sealing piece 10 , a fifth sealing piece 20 , and a sixth sealing piece 30 . DETAILED DESCRIPTION

[0022] The technical solution of the specific implementation method is described below in conjunction with the accompanying drawings.

[0023] It should be noted that: although this specification has described the present invention with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that technicians in the relevant technical field can still modify, combine or replace the present invention with equivalents, and all technical solutions and improvements thereto that do not depart from the spirit and scope of the present invention should be included in the scope of the present invention.

[0024] refer to Figure 1-Figure 3 A cylinder, the cylinder comprises a cylinder body 1, a first end cover assembly, a first shaft 3, a piston assembly and a second end cover assembly, the first end cover assembly comprises a first cover 21, the first cover 21 is located at one end of the cylinder body 1, the second end cover comprises a second cover 61, the second cover 61 is located at the other end of the cylinder body 1, the first shaft 3 passes through the second cover 61, the piston assembly comprises a piston member 51 and a first member 52, the outer peripheral wall of the piston member 51 is adapted to the inner peripheral wall of the cylinder body 1, the piston member 51 has a first mounting cavity 511, and the first member 52 is rotatably arranged In the first mounting cavity 511, the piston member 51 is sleeved on the first shaft 3, the first shaft 3 has a spiral slide 31, and a portion of the first member 52 cooperates with the spiral slide 31. It is defined that the surface perpendicular to the axis of the first shaft 3 is the first surface, and the line intersecting the first surface and the outer peripheral wall of the piston member 51 is the first line 7. It is defined that the first surface has a first point, and the first point is located on the axis of the first shaft 3. It is defined that the first line 7 has a second point and a third point, and the distance between the first point and the second point is L1, and the distance between the first point and the third point is L2, and L1≠L2.

[0025] The cylinder provided by the present invention includes a cylinder body 1, a first axis 3 and a piston member 51. The outer peripheral wall of the piston member 51 is adapted to the inner peripheral wall of the cylinder body 1. It is defined that the surface perpendicular to the axis of the first axis 3 is the first surface, and the line intersecting the first surface and the outer peripheral wall of the piston member 51 is the first line 7. It is defined that the first surface has a first point, and the first point is located on the axis of the first axis 3. It is defined that the first line 7 has a second point and a third point. The distance between the first point and the second point is L1, and the distance between the first point and the third point is L2, L1≠L2. When the piston member 51 moves, the rotation of the piston member 51 can be restricted by the inner peripheral wall of the cylinder body 1, thereby reducing the risk of internal leakage in the cylinder and reducing the risk of the piston rod being stuck or stuck.

[0026] refer to Figure 3 and Figure 7 The first piece 52 is cylindrical, and the piston assembly includes a first mounting sleeve 54, a first bearing 55, a first retaining ring 56, a second mounting sleeve, a second bearing and a second retaining ring. The first bearing 55 is sleeved on one end of the first piece 52, and the first mounting sleeve 54 is sleeved on the first bearing 55. The piston piece 51 has a first groove, and a part of the first retaining ring 56 is located in the first groove. The first retaining ring 56 is located on the side of the first mounting sleeve 54 away from the second mounting sleeve. The second bearing is sleeved on the other end of the first piece 52, and the second mounting sleeve is sleeved on the second bearing. The piston piece 51 has a second groove, and a part of the second retaining ring is located in the second groove. The second retaining ring is located on the side of the second mounting sleeve away from the first mounting sleeve 54. The first piece 52 is rotatable.

[0027] refer to Figure 3 and Figure 8 The number of the first pieces 52 is two, and the two first pieces 52 are symmetrically arranged on both sides of the first axis 3, which will not be described in detail here.

[0028] refer to Figure 1 and Figure 2 The first cover 21 includes a first mounting portion 211 and a first fixing portion 212, the first mounting portion 211 protrudes from the first fixing portion 212, one end of the cylinder body 1 is sleeved on the first mounting portion 211, the cylinder body 1 is sealed with the first mounting portion 211, and one end of the cylinder body 1 abuts against the first fixing portion 212, the second cover 61 includes a second mounting portion 611 and a second fixing portion 612, the second mounting portion 611 protrudes from the second fixing portion 612, the other end of the cylinder body 1 is sleeved on the second mounting portion 611, the other end of the cylinder body 1 is sealed with the second mounting portion 611, and the other end of the cylinder body 1 abuts against the second fixing portion 612, the cylinder includes a first connecting rod 8, one end of the first connecting rod 8 is connected to the first fixing portion 212, and the other end of the first connecting rod 8 is connected to the second fixing portion 612, so that the first cover 21 and the second cover 61 are limited at both ends of the cylinder body 1.

[0029] Optionally, the number of the first connecting rods 8 is four, and the four first connecting rods 8 are distributed on the outer circumference of the cylinder body 1 . The first connecting rods 8 and the first fixing portion 212 and the second fixing portion 612 may be connected by screws.

[0030] refer to Figure 2 The first end cover assembly includes a first external interface 213 and a first flow port, the first external interface 213 is connected to the first flow port, and the first flow port is located on one side of the piston member 51, and the second end cover assembly includes a second external interface 613 and a second flow port, and the second flow port is located on the other side of the piston member 51. When the cylinder is working, for example, when the cylinder moves from a first position (described below) to a second position (described below), the first external interface 213 is equivalent to a gas inlet, and the gas enters from the first external interface 213 to the side of the piston member 51 facing the first cover 21, pushing the piston member 51 to move toward the second cover 61, and the second external interface 613 is equivalent to an exhaust port; when the cylinder moves from the second position to the first position, the second external interface 613 is equivalent to an air inlet, and the gas enters from the second external interface 613 to the side of the piston member 51 facing the second cover 61, pushing the piston member 51 to move toward the first cover 21.

[0031] refer to Figure 2 Optionally, the first external interface 213 is disposed on the first cover 21, and the second external interface 613 is disposed on the second cover 61, which will not be described in detail here.

[0032] refer to Figure 3 The projection of any point on the outer wall of the piston member 51 on the first surface is located on the first line 7, that is, the outer wall of the piston member 51 is formed by the motion trajectory of the first line 7 along the axis of the first shaft 3, which is not elaborated here.

[0033] refer to Figure 3 The piston member 51 includes a first sliding portion 512, a first connecting portion 513 and a second sliding portion 514. The first sliding portion 512 is located on one side of the first connecting portion 513, and the second sliding portion 514 is located on the other side of the first connecting portion 513. The outer wall surface of the first sliding portion 512 (that is, the wall surface away from the first connecting portion 513) is arc-shaped, and the outer wall surface of the second sliding portion 514 (that is, the wall surface away from the second connecting portion) is arc-shaped. The outer wall surface of the first sliding portion 512 can be the same as the outer wall surface of the second sliding portion 514.

[0034] refer to Figure 3 The first connecting portion 513 has a cube or a rectangular shape, the first sliding portion 512 is a semi-cylindrical shape, and the second sliding portion 514 is a semi-cylindrical shape, which is convenient for rotational force and manufacturing, and is convenient for the arrangement and installation of the first piece 52 and the second piece 57 (described below), and reduces the size of the piston.

[0035] refer to Figure 3 , the radius of the first sliding portion 512 is R1, the cylinder body 1 includes a first matching portion 11, the first matching portion 11 is located on the side of the first sliding portion 512 away from the first connecting portion 513, the cross-section of the first matching portion 11 is semicircular, and the radius of the inner wall of the first matching portion 11 is R2, R2-R1, the cylinder body 1 includes a first middle portion 12, a second middle portion 13 and a second matching portion 14, the first middle portion 12 is located between one end of the first matching portion 11 and one end of the second matching portion 14, the second middle portion 13 is located between the other end of the first matching portion 11 and the other end of the second matching portion 14, the first middle portion 12 is flat, the second middle portion 13 is flat, the first middle portion 12 is parallel to the second middle portion 13, the cross-section of the second matching portion 14 is semicircular, the radius of the second sliding portion 514 is R3, and the inner diameter of the second matching portion 14 is R4, R4-R2, R1=R3, R2=R4.

[0036] refer to Figure 2 and Figure 4 The piston assembly includes a first seal 53, and the cross-section of the first seal 53 is roughly Z-shaped. During the operation of the cylinder, gas will enter the first seal, which will cause the first seal 53 to expand and improve the sealing performance. The piston component 51 has a first mounting groove 515, and the first seal 53 is located in the first mounting groove 515. The first seal 53 abuts against the bottom wall of the first mounting groove 515, and the first seal 53 abuts against the inner circumferential wall of the cylinder body 1.

[0037] refer to Figure 2 and Figure 5 The piston assembly includes a second piece 57, which is connected to the piston member 51, for example, by a second retaining ring. The second piece 57 includes a first main body 571, a first protrusion 572 and a second protrusion 573. The first main body 571 is in a hollow cylindrical shape. The first protrusion 572 protrudes from the outer peripheral wall of the first main body 571, and the second protrusion 573 protrudes from the inner peripheral wall of the first main body 571. The piston member 51 is sleeved on the first protrusion 572. The piston assembly includes a second sealing member 58, which is located between the piston member 51 and the first protrusion 572 to improve the sealing performance. The piston assembly includes a third sealing member 59, which is located between the second protrusion 573 and the piston member 51. The third sealing member 59 is sleeved on the first shaft 3, and the inner wall of the third sealing member 59 is adapted to the spiral slideway 31 to improve the sealing performance.

[0038] The first shaft 3 includes a first spiral portion 32 and a first support portion 33, the first support portion 33 extends from one end of the first spiral portion 32, the first cover 21 has a first accommodating cavity, the first support portion 33 is located in the first accommodating cavity, the cylinder includes a third piece 9, the third piece 9 is sleeved on the first support portion 33, the cylinder includes a fourth sealing member 10, the fourth sealing member 10 is sleeved on the third piece 9, when the piston member 51 is in the first position, the first main body portion 571 is sleeved on the third piece 9, and the fourth sealing member 10 is located between the third piece 9 and the first main body portion 571 to improve the sealing performance.

[0039] refer to Figure 2 and Figure 6 The piston assembly includes a fourth piece 60, the fourth piece 60, the piston piece 51 is sleeved on the fourth piece 60, the piston piece 51 and the fourth piece 60 are interference fit, and the cylinder includes a fifth sealing piece 20, the fifth sealing piece 20 is sleeved on the fourth piece 60, and the fifth sealing piece 20 is located between the fourth piece 60 and the piston piece 51 to improve the sealing performance.

[0040] The first shaft 3 includes a second support portion 34, which extends from the other end of the first spiral portion 32. The cylinder includes a sixth sealing member 30, which is sleeved on the second support portion 34. When the piston member 51 is located in the second position, the fourth member 60 is sleeved on the second support portion 34, and the sixth sealing member 30 is located between the fourth member 60 and the second support portion 34.

[0041] Referring to FIG. 9 , when the piston member 51 is located at the second position, the two first members 52 cooperate with the second support portion 34 to enable the first shaft 3 and the piston member 51 to move together, which will not be described in detail here.

[0042] Although the technical solution of the present invention has been shown and described above, it can be understood that the above technical solution is exemplary and cannot be understood as a limitation to the present invention. Changes, modifications, substitutions and variations of the above technical solution are all within the protection scope of the present invention.

Claims

1. A cylinder, characterized in that: The cylinder comprises a cylinder body (1), a first end cover assembly, a first shaft (3), a piston assembly and a second end cover assembly, wherein the first end cover assembly comprises a first cover (21), the first cover (21) being located at one end of the cylinder body (1), the second end cover assembly comprises a second cover (61), the second cover (61) being located at the other end of the cylinder body (1), the first shaft (3) passing through the second cover (61), the piston assembly comprises a piston member (51) and a first member (52), the outer peripheral wall of the piston member (51) being matched with the inner peripheral wall of the cylinder body (1), the piston member (51) having a first mounting cavity (511), the first member (52) being rotatably arranged In the first mounting cavity (511), the piston member (51) is sleeved on the first shaft (3), the first shaft (3) has a spiral slideway (31), and a portion of the first member (52) cooperates with the spiral slideway (31). It is defined that the surface perpendicular to the axis of the first shaft (3) is the first surface, and the line intersecting the first surface and the outer peripheral wall of the piston member (51) is the first line (7). It is defined that the first surface has a first point, and the first point is located on the axis of the first shaft (3). It is defined that the first line (7) has a second point and a third point, and the distance between the first point and the second point is L1, and the distance between the first point and the third point is L2, and L1≠L2.

2. The cylinder according to claim 1, characterized in that The projection of any point on the outer peripheral wall of the piston member (51) on the first surface is located on the first line (7).

3. The cylinder according to claim 1 or 2, characterized in that: The piston member (51) comprises a first sliding portion (512), a first connecting portion (513) and a second sliding portion (514); the first sliding portion (512) is located on one side of the first connecting portion (513), and the second sliding portion (514) is located on the other side of the first connecting portion (513); the outer wall surface of the first sliding portion (512) is arc-shaped, and the outer wall surface of the second sliding portion (514) is arc-shaped.

4. The cylinder according to claim 3, characterized in that The first connecting portion (513) has a cube shape or a rectangular parallelepiped shape, the first sliding portion (512) has a semi-cylindrical shape, and the second sliding portion (514) has a semi-cylindrical shape.

5. The cylinder according to claim 4, characterized in that The radius of the first sliding portion (512) is R1, and the cylinder body (1) includes a first matching portion (11). The first matching portion (11) is located on a side of the first sliding portion (512) away from the first connecting portion (513), and the inner diameter of the first matching portion (11) is R2, 25mm≤R2-R1≤50mm.

6. The cylinder according to claim 4 or 5, characterized in that: The piston assembly comprises a first sealing member (53), the cross section of which is roughly Z-shaped, the piston member (51) having a first mounting groove (515), the first sealing member (53) being located in the first mounting groove (515), the first sealing member (53) being in contact with the bottom wall of the first mounting groove (515), and the first sealing member (53) being in contact with the inner peripheral wall of the cylinder body (1).

7. The cylinder according to claim 1, characterized in that The first cover (21) comprises a first mounting portion (211) and a first fixing portion (212), the first mounting portion (211) protruding from the first fixing portion (212), one end of the cylinder body (1) is sleeved on the first mounting portion (211), and one end of the cylinder body (1) abuts against the first fixing portion (212); the second cover (61) comprises a second mounting portion (611) and a second fixing portion (612), the second mounting portion (611) protruding from the second fixing portion (612), the other end of the cylinder body (1) is sleeved on the second mounting portion (611), and the other end of the cylinder body (1) abuts against the second fixing portion (612); the cylinder comprises a first connecting rod (8), one end of the first connecting rod (8) is connected to the first fixing portion (212), and the other end of the first connecting rod (8) is connected to the second fixing portion (612).

8. The cylinder according to claim 1, characterized in that The first member (52) is cylindrical, and the piston assembly comprises a first mounting sleeve (54), a first bearing (55), a first retaining ring (56), a second mounting sleeve, a second bearing and a second retaining ring. The first bearing (55) is sleeved on one end of the first member (52), and the first mounting sleeve (54) is sleeved on the first bearing (55). The piston member (51) has a first groove, a portion of the first retaining ring (56) is located in the first groove, and the first retaining ring (56) is located on a side of the first mounting sleeve (54) away from the second mounting sleeve. The second bearing is sleeved on the other end of the first member (52), and the second mounting sleeve is sleeved on the second bearing. The piston member (51) has a second groove, a portion of the second retaining ring is located in the second groove, and the second retaining ring is located on a side of the second mounting sleeve away from the first mounting sleeve (54).

9. The cylinder according to claim 1, characterized in that The first end cover assembly includes a first external interface (213) and a first flow port, the first external interface (213) is connected to the first flow port, the first flow port is located on one side of the piston member (51), and the second end cover assembly includes a second external interface (613) and a second flow port, the second flow port is located on the other side of the piston member (51).

10. The cylinder according to claim 1, characterized in that The piston assembly comprises a second piece (57), the second piece (57) is connected to the piston member (51), the second piece (57) comprises a first main body (571), a first protruding portion (572) and a second protruding portion (573), the first main body (571) is in the shape of a hollow cylinder, the first protruding portion (572) protrudes from the outer peripheral wall of the first main body (571), the second protruding portion (573) protrudes from the inner peripheral wall of the first main body (571), and the piston member (51) is sleeved on the The first protrusion (572), the piston assembly includes a second sealing member (58), the second sealing member (58) is located between the piston member (51) and the first protrusion (572), the piston assembly includes a third sealing member (59), the third sealing member (59) is located between the second protrusion (573) and the piston member (51), the third sealing member (59) is sleeved on the first shaft (3), and the inner wall of the third sealing member (59) is adapted to the spiral slideway (31); The first shaft (3) comprises a first spiral portion (32) and a first support portion (33), wherein the first support portion (33) extends from one end of the first spiral portion (32), the first cover (21) comprises a first accommodating cavity, wherein the first support portion (33) is located in the first accommodating cavity, the cylinder comprises a third member (9), wherein the third member (9) is sleeved on the first support portion (33), the cylinder comprises a fourth sealing member (10), wherein the fourth sealing member (10) is sleeved on the third member (9), and when the piston member (51) is located in the first position, the first main body portion (571) is sleeved on the third member (9), and the fourth sealing member (10) is located between the third member (9) and the first main body portion (571).

11. The cylinder according to claim 10, characterized in that The piston assembly comprises a fourth member (60), the fourth member (60), the piston member (51) is sleeved on the fourth member (60), the piston member (51) and the fourth member (60) are interference fit, the cylinder comprises a fifth sealing member (20), the fifth sealing member (20) is sleeved on the fourth member (60), and the fifth sealing member (20) is located between the fourth member (60) and the piston member (51); The first shaft (3) comprises a second support portion (34), the second support portion (34) extends from the other end of the first spiral portion (32), the cylinder comprises a sixth sealing member (30), the sixth sealing member (30) is sleeved on the second support portion (34), when the piston member (51) is located in the second position, the fourth member (60) is sleeved on the second support member, and the sixth sealing member (30) is located between the fourth member (60) and the second support portion (34).

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