Double-cylinder parallel nitrogen tension cylinder

Abstract

The utility model discloses a double -cylinder parallel formula nitrogen tension cylinder, including main cylinder, auxiliary cylinder, piston rod and piston, this nitrogen tension cylinder is provided with the auxiliary cylinder parallel with main cylinder, like this can increase gas storage space, reduce the pressure ratio, reduce the force change of operating process, make the output force of piston rod more stable, furthermore, the nitrogen tension cylinder has self -lubricating property, can prolong its life. In addition, the nitrogen tension cylinder sets up the safety groove on the inner wall of one end of main cylinder close to first front end cover, and the safety hidden danger such as cylinder overload, component damage of tension balance cylinder because of overstroke.

Description

Technical Field

[0001] This utility model relates to the field of nitrogen-filled tension cylinder technology, and in particular to a dual-cylinder parallel nitrogen-filled tension cylinder. Background Technology

[0002] Nitrogen tension cylinders, also known as nitrogen springs or nitrogen balance cylinders, are a new type of elastic component that uses high-pressure nitrogen as the working medium. They offer advantages such as small size, high elastic force, long stroke, stable operation, precision manufacturing, long service life, a gentle elasticity curve, and no need for pre-tightening, making them widely used in mold making. When the piston rod of a nitrogen spring is compressed, it compresses the nitrogen gas inside the cylinder, creating elastic force. Once the pressure is released or reduced, the nitrogen gas in the cylinder pushes the piston rod to quickly eject again.

[0003] In practical use, the extension stroke of a nitrogen-filled tension cylinder depends primarily on the length of the cylinder containing the piston and the matching high-pressure medium filling cylinder. Existing nitrogen-filled tension cylinders employ multiple high-pressure medium filling cylinders to achieve long strokes. The presence of multiple high-pressure medium filling cylinders firstly increases the overall axial volume of the nitrogen spring, thus increasing the axial space required during installation and use; multiple high-pressure medium filling cylinders also increase the risk of high-pressure medium leakage during prolonged use and further complicate equipment assembly and production. Utility Model Content

[0004] Based on this, it is necessary to address the shortcomings of existing technologies by providing a dual-cylinder parallel nitrogen thrust cylinder. This cylinder uses a combination of a main cylinder and an auxiliary cylinder, which increases the gas storage space, reduces the pressure ratio, minimizes force changes during operation, and makes the output force of the piston rod more stable.

[0005] To achieve the purpose of this utility model, a dual-cylinder parallel nitrogen thrust cylinder is provided, including a main cylinder, an auxiliary cylinder, a piston rod, and a piston. The auxiliary cylinder is arranged parallel to the main cylinder. The main cylinder has a first rear end cap and a first front end cap at its two ends, and the auxiliary cylinder has a second rear end cap connected to the first rear end cap and a second front end cap connected to the first front end cap at its two ends. The piston rod has a first end and a second end. The first end and the second end are located inside and outside the main cylinder, respectively, with the second end adjacent to the first front end cap. The piston is fitted onto the first end of the piston rod, dividing the inner cavity of the main cylinder into a first cavity near the first rear end cap and a second cavity near the first front end cap. The second cavity is connected to the inner cavity of the auxiliary cylinder through a connecting channel provided in the first and second front end caps. A safety groove is provided on the inner wall of the main cylinder, located at the end of the main cylinder near the first front end cap, and the diameter of the safety groove is larger than the diameter of the piston.

[0006] In one embodiment of this application, a pusher protrusion is provided on the first end of the rod. The pusher protrusion is located on the side of the piston near the first rear end cover. The outer diameter of the pusher protrusion matches the inner diameter of the master cylinder. An oil reservoir is provided on the side of the pusher protrusion facing the first rear end cover.

[0007] In one embodiment of this application, a silencing hole is provided inside the first rear end cover, one end of the silencing hole is connected to the first cavity, and a silencer is provided inside the silencing hole.

[0008] In one embodiment of this application, the other end of the silencing hole extends to the side of the first rear end cover facing the second rear end cover.

[0009] In one embodiment of this application, the first front end cover and the second front end cover are sealed by an insert sealing assembly. The insert sealing assembly includes a sealing insert and a sealing ring. One end of the sealing insert is placed in a first groove corresponding to the first front end cover, and the other end is placed in a second groove corresponding to the second front end cover. The sealing insert has a central hole that communicates with the connecting channel. An insert sealing ring is provided between the sealing insert and the first front end cover, and between the sealing insert and the second front end cover.

[0010] In one embodiment of this application, the piston includes a first piston and a second piston. The first piston is located on the side of the second piston close to the first connecting assembly. The first piston and the master cylinder, the first piston and the piston rod, the second piston and the master cylinder, and the second piston and the piston rod are all sealed together.

[0011] In one embodiment of this application, the piston further includes a spacer sleeve fitted over the piston rod, with the two ends of the spacer sleeve abutting against the first piston and the second piston, respectively.

[0012] In one embodiment of this application, the piston further includes a guide valve, which is mounted on the second piston.

[0013] In one embodiment of this application, the first rear end cover and the second rear end cover are detachably connected; the first front end cover and the second front end cover are also detachably connected.

[0014] In one embodiment of this application, a first connecting component and a second connecting component are further included, the first connecting component and the second connecting component being respectively mounted on the first rear end cover and the second end of the rod.

[0015] The beneficial effects of this utility model of a dual-cylinder parallel nitrogen tension cylinder are as follows:

[0016] 1. This utility model adopts a structure combining a main cylinder and an auxiliary cylinder, which increases the gas storage space, reduces the pressure ratio, reduces force changes during operation, and makes the output force of the piston rod more stable.

[0017] 2. This utility model sets up an auxiliary cylinder for storing nitrogen parallel to the main cylinder. The auxiliary cylinder and the main cylinder can be connected through a single connecting channel, which greatly reduces the risk of leakage. Moreover, this setting can reduce the axial size of the entire nitrogen tension cylinder, which helps to reduce the axial space occupied during installation. It is suitable for installation occasions with limited axial space. In addition, the manufacturing and installation are relatively simple. The auxiliary cylinder and the main cylinder can be machined separately and then assembled together.

[0018] 3. This utility model provides a safety groove on the inner wall of the main cylinder near the first front end cover. When the piston rod overtravels, the piston also moves to the position of the safety groove. Since the diameter of the safety groove is larger than the diameter of the piston, there is a large gap between the piston and the main cylinder. The gas in the auxiliary cylinder will run into the first chamber through this gap, so that the gas pressure in the auxiliary cylinder is released, avoiding safety hazards such as cylinder overload and component damage caused by overtravel in the tension balance cylinder.

[0019] 4. This utility model provides an oil reservoir on the side of the piston rod's pusher protrusion facing the first chamber, and a piston sleeve including a first piston and a second piston, with an oil reservoir formed between the first piston and the second piston. By placing lubricating oil in the oil reservoir and the oil reservoir, both the first and second chambers on both sides of the piston can be lubricated to lubricate the inner wall of the main cylinder. This reduces the wear of the main cylinder on the seals on the piston, thus extending the service life of the seals on the piston.

[0020] 5. By setting a first piston and a second piston, this utility model achieves a double sealing effect. When the sealing function of one piston deteriorates, the other piston can continue to provide a sealing effect, thus extending the service life of the entire piston. Attached Figure Description

[0021] Figure 1 A simplified cross-sectional view of the dual-cylinder parallel nitrogen thrust cylinder according to an embodiment of this utility model. Figure 1 ;

[0022] Figure 2 A simplified cross-sectional view of the dual-cylinder parallel nitrogen thrust cylinder according to an embodiment of this utility model. Figure 2 ;

[0023] Figure 3 for Figure 1 A cross-sectional view of the piston rod in the diagram;

[0024] Figure 4 for Figure 2 Enlarged view of the area circled in the middle circle A;

[0025] Figure 5 for Figure 1 Enlarged view of the area circled by circle B;

[0026] Figure 6 for Figure 1 A magnified view of the area circled in circle C.

[0027] The following is a description of the attached figures:

[0028] 10. Main cylinder; 11. First rear end cap; 111. Silencing hole; 112. First sealing ring; 12. First front end cap; 121. First groove; 122. Second sealing ring; 123. First combined sealing structure; 124. Piston rod seal; 125. Wear-resistant sleeve; 126. Inner dustproof component; 13. First chamber; 14. Second chamber; 15. Safety groove; 101. Oil reservoir; 20. Auxiliary cylinder; 21. Second rear end cap; 211. Air inlet; 212. Third sealing ring; 22. Second front end cap; 221. Second groove; 222. Fourth sealing ring; 23. Sealing cap; 30. Piston rod; 31. First end of rod; 3 2. Second end of rod; 33. Push plug protrusion; 331. Oil reservoir; 34. First wear-resistant band; 40. Piston; 41. First piston; 42. Second piston; 43. One-way valve; 44. Spacer; 45. Fifth sealing ring; 46. Second wear-resistant band; 47. Second combined sealing structure; 48. Sixth sealing ring; 49. Third wear-resistant band; 410. Third combined sealing structure; 50. Muffler; 60. First connecting assembly; 61. Rear bearing housing; 62. Rear bearing; 70. Second connecting assembly; 71. Front bearing housing; 72. Front bearing; 81. Sealing insert; 82. Lead block sealing ring; 100. Connecting channel. Detailed Implementation

[0029] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0030] Please see Figures 1 to 6 This utility model embodiment shows a dual-cylinder parallel nitrogen thrust cylinder, which includes a main cylinder 10, a secondary cylinder 20, a piston rod 30, a piston 40, a first connecting assembly 60, and a second connecting assembly 70.

[0031] like Figure 1As shown, the auxiliary cylinder 20 is arranged side by side with the main cylinder 10. The main cylinder 10 has a first rear end cover 11 and a first front end cover 12 at both ends, respectively. The auxiliary cylinder 20 has a second rear end cover 21 connecting to the first rear end cover 11 and a second front end cover 22 connecting to the first front end cover 12 at both ends, respectively. The second rear end cover 21 has an air inlet 211 for connecting to an external nitrogen source. The air inlet end of the air inlet 211 is sealed by a sealing cap 23. When the air inlet 211 needs to be connected to an external gas source, the sealing cap 23 is removed. After the auxiliary cylinder 20 is filled with nitrogen, the sealing cap 23 is placed over the air inlet 211. The piston rod 30 passes through the first front end cover 12, and the piston rod 30 has… The first end 31 and the second end 32 of the rod are located inside and outside the main cylinder 10, respectively. The piston 40 is fitted onto the first end 31 of the rod and divides the inner cavity of the main cylinder 10 into a first cavity 13 near the first rear end cover 11 and a second cavity 14 near the first front end cover 12. The second cavity 14 is connected to the inner cavity of the auxiliary cylinder 20 through a connecting channel 100 provided in the first front end cover 12 and the second front end cover 22. The first connecting assembly 60 and the second connecting assembly 70 are respectively installed on the first rear end cover 11 and the second end 32 of the rod to connect the entire dual-cylinder parallel nitrogen traction cylinder to an external structure, device or equipment.

[0032] A certain amount of nitrogen is introduced into the auxiliary cylinder 20 through the air intake port 211. When an external force is applied to the piston rod 30 to drive it to move in the direction from the first rear end cover 11 to the first front end cover 12, the gas in the second chamber 14 is pushed into the auxiliary cylinder 20 by the piston 40. The nitrogen pressure in the auxiliary cylinder 20 gradually increases. When the external force applied to the piston rod 30 is removed, the high-pressure nitrogen in the auxiliary cylinder 20 will run into the second chamber 14 of the main cylinder 10, quickly pushing the piston 40 and driving the piston rod 30 back to its original position.

[0033] This invention, by setting up an auxiliary cylinder 20 parallel to the main cylinder 10, allows the auxiliary cylinder 20 to be connected to the main cylinder 10 via a single connecting channel 100, significantly reducing the risk of leakage. Furthermore, this arrangement reduces the overall axial size of the nitrogen-filled cylinder, helping to minimize the axial space required during installation, making it suitable for applications with limited axial space. Moreover, it is relatively easy to manufacture and install; the auxiliary cylinder 20 and main cylinder 10 are simply machined separately and then assembled together. In addition, the addition of the auxiliary cylinder 20 increases the gas storage space, which can lower the pressure ratio, reduce fluctuations in output force during operation, and make the output force of the piston rod 30 more stable.

[0034] In some embodiments of this application, such as Figure 1As shown, the inner wall of the main cylinder 10 is provided with an annular recessed safety groove 15. The safety groove 15 is located on the end of the main cylinder 10 near the first front end cover 12, and the diameter of the safety groove 15 is larger than the diameter of the piston 40. When the piston rod 30 moves beyond its travel, the piston 40 will move to the position of the safety groove 15. Because the diameter of the safety groove 15 is larger than the diameter of the piston 40, there will be a large gap between the piston 40 and the main cylinder 10 in this situation. The gas in the auxiliary cylinder 20 will run into the first chamber 13 through this gap, so that the gas pressure in the auxiliary cylinder 20 is released, avoiding safety hazards such as cylinder overload and component damage caused by overtravel in the tension balance cylinder.

[0035] In some embodiments of this application, the first rear end cover 11 and the second rear end cover 21 are detachably connected, and the first front end cover 12 and the second front end cover 22 are also detachably connected. For example, the first rear end cover 11 and the second rear end cover 21 are detachably connected by screws or bolts, and the first front end cover 12 and the second front end cover 22 are detachably connected by screws or bolts.

[0036] Furthermore, such as Figure 2 As shown, the first rear end cover 11 and the main cylinder 10, the first front end cover 12 and the main cylinder 10, the second rear end cover 21 and the auxiliary cylinder 20, and the second front end cover 22 and the auxiliary cylinder 20 are respectively sealed by the first sealing ring 112, the second sealing ring 122, the third sealing ring 212 and the fourth sealing ring 222.

[0037] Furthermore, the inner wall of the first front end cover 12 is provided with a wear-resistant sleeve 125, an inner dustproof component 126, a first combined sealing structure 123, and a piston rod seal 124 corresponding to the piston rod 30. The wear-resistant sleeve 125 is used to prevent friction damage caused by contact between the piston rod 30 and the first front end cover 12, and the inner dustproof component 126 is used to prevent external dust from entering the main cylinder 10. The first combined sealing structure 123 and the piston rod seal 124 are used to prevent gas and lubricating oil from escaping from between the first front end cover 12 and the piston rod 30 to the outside of the main cylinder 10. The first combined sealing structure 123 is composed of an O-ring and an annular sealing ring with a square cross-section. The piston rod seal 124 is provided with an annular groove coaxial with the piston rod 30. The cross-section of the annular groove is V-shaped. The annular groove on the piston rod seal 124 can increase the compressibility of the piston rod seal 124, so that the piston rod seal 124 can better fit the outer wall of the piston rod 30 and the inner wall of the first front end cover 12, achieving a better sealing effect.

[0038] In some embodiments of this application, such as Figure 3As shown, a pusher protrusion 33 is provided on the first end 31 of the rod. The pusher protrusion 33 is located on the side of the piston 40 near the first rear end cover 11, and is used to prevent the piston 40 from disengaging from the first end 31 of the rod. The outer diameter of the pusher protrusion 33 matches the inner diameter of the master cylinder 10. An oil reservoir 331 is provided on the side of the pusher protrusion 33 facing the first rear end cover 11. The oil reservoir 331 prevents the lubricating oil in the first chamber 13 from being completely squeezed out of the cylinder, thereby extending the residence time of the lubricating oil in the first chamber 13 and providing a longer lubrication time.

[0039] Furthermore, the oil storage tank 331 can be arranged in a ring shape on the pusher protrusion 33, or it can be arranged in a column shape on the pusher protrusion 33.

[0040] like Figure 2 As shown, a first wear-resistant band 34 is provided between the pusher protrusion 33 and the cylinder body. The first wear-resistant band 34 is installed on the pusher protrusion 33 to prevent the pusher protrusion 33 from contacting the inner wall of the main cylinder 10, so that the main cylinder 10 will not cause friction damage to the pusher protrusion 33 of the piston rod 30.

[0041] In one embodiment of this application, such as Figure 4 As shown, the piston 40 includes a first piston 41 and a second piston 42. The first piston 41 is located on the side of the second piston 42 near the first connecting assembly 60. Sealing arrangements are provided between the first piston 41 and the master cylinder 10, between the first piston 41 and the piston rod 30, between the second piston 42 and the master cylinder 10, and between the second piston 42 and the piston rod 30. The first piston 41 and the second piston 42 are spaced apart, forming an oil reservoir 101 between them. By providing the first piston 41 and the second piston 42, a double sealing effect is achieved. When the sealing function of one piston 40 deteriorates, the other piston 40 can continue to provide a sealing effect, extending the service life of the entire piston 40. In addition, by forming an oil reservoir 101 between the first piston 41 and the second piston 42, and with the oil reservoir 331 on the pusher protrusion 33 of the piston rod 30, lubricating oil can be placed in the oil reservoir 331 and the oil reservoir 101, thus achieving lubrication of the inner walls of the main cylinder 10 on both sides of the piston 40. This reduces the wear of the main cylinder 10 on the seals installed on the piston 40, and has the beneficial effect of extending the service life of the seals on the piston 40.

[0042] Furthermore, a fifth sealing ring 45 is provided on the inner wall of the first piston 41 corresponding to the piston rod 30, and a second wear-resistant band 46 and a second combined sealing structure 47 are provided on the outer wall of the first piston 41 corresponding to the main cylinder 10. The second combined sealing structure 47 has the same structure as the first combined sealing structure 123, and will not be described in detail here. A sixth sealing ring 48 is provided on the inner wall of the second piston 42 corresponding to the piston rod 30, and a third wear-resistant band 49 and a third combined sealing structure 410 are provided on the outer wall of the second piston 42 corresponding to the main cylinder 10. The third combined sealing structure 410 has the same structure as the first combined sealing structure 123, and will not be described in detail here.

[0043] Furthermore, the piston 40 also includes a guide valve 43, which is mounted on the second piston 42. When there is too much gas or lubricating oil in the oil reservoir 101, the excess gas or lubricating oil can be discharged into the second chamber 14 through the one-way valve 43, preventing the first piston 41 and the second piston 42 from being squeezed and deformed due to excessive oil pressure or gas pressure in the oil reservoir 101.

[0044] Furthermore, the piston 40 also includes a spacer 44 sleeved around the piston rod 30, with the two ends of the spacer 44 abutting against the first piston 41 and the second piston 42 respectively, for limiting the distance between the piston 40 and the sealing sleeve.

[0045] In some embodiments of this application, such as Figure 5 As shown, a silencing hole 111 is provided inside the first rear end cover 11. One end of the silencing hole 111 is connected to the first cavity 13, and a silencer 50 is provided inside the silencing hole 111. The silencer 50 can eliminate the sound generated by the collision between the piston 40 and the first rear end cover 11, thus avoiding noise generation.

[0046] Furthermore, the other end of the silencing hole 111 extends to the side of the first rear end cover 11 facing the second rear end cover 21. This arrangement allows the second rear end cover 21 to seal the silencing hole 111, preventing external dust from entering the silencing hole 111.

[0047] In some embodiments of this application, the first connecting assembly 60 is used for rotatably connecting to an external structure, device, or equipment, specifically, such as Figure 1 As shown, the first connecting assembly 60 includes a rear bearing housing 61 connected to the first rear end cover 11 and a rear bearing 62 installed in the rear bearing housing 61.

[0048] Similarly, the second connecting assembly 70 is also used for rotatably connecting to external structures, devices, or equipment, such as... Figure 1 As shown, the second connecting assembly 70 includes a front bearing housing 71 connected to the first front end cover 12 and a front bearing 72 installed in the front bearing housing 71.

[0049] The structural arrangement of the first connecting component 60 and the second connecting component 70 described above enables the tension cylinder of this utility model to be used in devices that perform rotational actions, such as for driving the rotational actions of a robot's robotic arm.

[0050] In some embodiments of this application, such as Figure 6 As shown, the first front end cover 12 and the second front end cover 22 are sealed together by an insert sealing assembly. The insert sealing assembly includes a sealing insert 81 and a sealing ring. One end of the sealing insert 81 is placed in the first groove 121 corresponding to the first front end cover 12, and the other end is placed in the second groove 221 corresponding to the second front end cover 22. The sealing insert 81 has a central hole that connects to the connecting channel 100. Insert sealing rings 82 are provided between the sealing insert 81 and the first front end cover 12, and between the sealing insert 81 and the second front end cover 22. The sealing insert 81 increases the sealing contact area between the first front end cover 12 and the second front end cover 22, thus greatly improving the sealing performance between the two front end covers.

[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A dual-cylinder parallel nitrogen-filled thrust cylinder, characterized in that, The system includes a main cylinder, a secondary cylinder, a piston rod, and a piston. The secondary cylinder is arranged parallel to the main cylinder. The main cylinder has a first rear end cap and a first front end cap at its two ends, and the secondary cylinder has a second rear end cap connected to the first rear end cap and a second front end cap connected to the first front end cap at its two ends. The piston rod has a first end and a second end. The first end and the second end are located inside and outside the main cylinder, respectively, with the second end adjacent to the first front end cap. The piston is fitted onto the first end of the piston rod, dividing the inner cavity of the main cylinder into a first cavity near the first rear end cap and a second cavity near the first front end cap. The second cavity is connected to the inner cavity of the secondary cylinder through a connecting channel located within the first and second front end caps. A safety groove is provided on the inner wall of the main cylinder, located at the end of the main cylinder closest to the first front end cap, and the diameter of the safety groove is larger than the diameter of the piston.

2. A parallel-type nitrogen-filled thrust cylinder according to claim 1, characterized in that, The first end of the rod is provided with a pusher protrusion, which is located on the side of the piston near the first rear end cover. The outer diameter of the pusher protrusion matches the inner diameter of the master cylinder. An oil reservoir is provided on the side of the pusher protrusion facing the first rear end cover.

3. A parallel-type nitrogen-filled thrust cylinder according to claim 1, characterized in that, The first rear end cover is provided with a silencing hole, one end of which is connected to the first cavity, and a silencer is provided inside the silencing hole.

4. A parallel-type nitrogen-filled thrust cylinder according to claim 3, characterized in that, The other end of the silencing hole extends to the side of the first rear end cover facing the second rear end cover.

5. A parallel-type nitrogen-filled thrust cylinder according to claim 1, characterized in that, The first front end cover and the second front end cover are sealed by an insert sealing assembly. The insert sealing assembly includes a sealing insert and a sealing ring. One end of the sealing insert is placed in a first groove corresponding to the first front end cover, and the other end is placed in a second groove corresponding to the second front end cover. The sealing insert has a central hole that connects to the connecting channel. An insert sealing ring is provided between the sealing insert and the first front end cover, and between the sealing insert and the second front end cover.

6. A parallel-type nitrogen-filled thrust cylinder according to claim 1, characterized in that, The piston includes a first piston and a second piston. The first piston is located on the side of the second piston closer to the first connecting assembly. The first piston and the master cylinder, the first piston and the piston rod, the second piston and the master cylinder, and the second piston and the piston rod are all sealed together.

7. A parallel-type nitrogen-filled thrust cylinder according to claim 6, characterized in that, The piston also includes a spacer sleeve fitted over the piston rod, with the two ends of the spacer sleeve abutting against the first piston and the second piston, respectively.

8. A parallel-type nitrogen-filled thrust cylinder according to claim 6, characterized in that, The piston also includes a guide valve, which is mounted on the second piston.

9. A parallel-type nitrogen-filled thrust cylinder according to claim 1, characterized in that, The first rear end cover and the second rear end cover are detachably connected; the first front end cover and the second front end cover are also detachably connected.

10. A parallel-type nitrogen-filled thrust cylinder according to claim 1, characterized in that, It also includes a first connecting component and a second connecting component, which are respectively mounted on the first rear end cover and the second end of the rod.

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