A thin cylinder

Abstract

The present invention relates to the field of mechanical equipment, and specifically to a thin cylinder, which includes an inner cylinder, a sealing end cover, a piston rod, a piston, an outer cylinder, a separating piston, a first spring and a second spring; the inner cylinder is provided with a containing cavity, and one end of the inner cylinder is provided with a mounting port connected to the containing cavity; the outer wall of the inner cylinder is provided with a first mounting groove, a second mounting groove, a third mounting groove, a first spiral groove and a second spiral groove; the third mounting groove is located between the first mounting groove and the second mounting groove; one end of the first spiral groove is connected to the first mounting groove, and the other end is connected to the third mounting groove; one end of the second spiral groove is connected to the second mounting groove, and the other end is connected to the third mounting groove. When exhausting, the above-mentioned thin cylinder can allow gas to be discharged along the first spiral groove or the second spiral groove, so that the gas takes away part of the heat of the thin cylinder to cool the thin cylinder, thereby achieving the beneficial effect of protecting the thin cylinder and increasing the service life of the thin cylinder.

Description

Technical Field

[0001] The invention relates to the field of mechanical equipment, in particular to a thin cylinder. Background Art

[0002] Thin cylinders are a very common type of mechanical equipment in the industrial field. They have the advantages of compact structure, light weight, small footprint, and the ability to withstand large lateral loads. They can also be used directly on various fixtures and special equipment without installing accessories. Therefore, they are widely used in printing, semiconductors, automation control, robotics and other fields.

[0003] Thin cylinders usually include a cylinder body, an end cover, a piston, a piston rod and other structures, which can convert the pressure of compressed air into mechanical energy to drive the piston and the piston rod to make linear motion relative to the cylinder body. The current thin cylinders usually face a problem during operation: due to factors such as friction between parts, a high temperature environment is easily formed inside the thin cylinder. If effective cooling measures are not taken, it is easy to affect the normal operation of the thin cylinder, and even cause failure of the thin cylinder and shorten its service life. In order to achieve further development and application of thin cylinders, the above problems need to be solved urgently. Summary of the invention

[0004] Based on this, it is necessary to provide a thin cylinder to address the problem that the current thin cylinder easily forms a high temperature environment during operation, thereby affecting its normal operation.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A thin cylinder comprises an inner cylinder, a sealing end cover, a piston rod, a piston, an outer cylinder, a separating piston, a first spring and a second spring; the inner cylinder is provided with a containing cavity, and one end of the inner cylinder is provided with a mounting port connected with the containing cavity; the outer side wall of the inner cylinder is provided with a first mounting groove, a second mounting groove, a third mounting groove, a first spiral groove and a second spiral groove; the third mounting groove is located between the first mounting groove and the second mounting groove; one end of the first spiral groove is connected with the first mounting groove, and the other end is connected with the third mounting groove; one end of the second spiral groove is connected with the second mounting groove, and the other end is connected with the third mounting groove; the sealing end cover is connected with The outer sleeve is sleeved on the outer circumference of the inner sleeve and completely covers the outer side wall of the inner sleeve; the inner side wall of the outer sleeve is provided with a first receiving groove, a second receiving groove and a third receiving groove, and the inner side wall of the outer sleeve is provided with a first receiving groove, a second receiving groove and a third receiving groove. The outer wall of the outer cylinder is provided with a first air inlet hole, a second air inlet hole, a first exhaust hole and a second exhaust hole; the first receiving groove is arranged opposite to and communicated with the first mounting groove, and the first air inlet hole is communicated with the first receiving groove; the second receiving groove is arranged opposite to and communicated with the second mounting groove, and the second air inlet hole is communicated with the second receiving groove; the third receiving groove is arranged opposite to and communicated with the third mounting groove, the first exhaust hole is communicated with the third receiving groove, and the second exhaust hole is communicated with the third receiving groove; a part of the separation piston is accommodated in the third mounting groove, and the other part is accommodated in the third receiving groove, and the separation piston separates the first spiral groove and the second spiral groove The groove is separated; one end of the first spring is connected to the inner bottom wall of the first mounting groove, and the other end is connected to the first piston block, and the first piston block is provided with a third connecting hole, and the third connecting hole is staggered with the first air inlet hole, and the first spring holds the first piston block against the inner bottom wall of the first receiving groove to block the first air inlet hole; one end of the second spring is connected to the inner bottom wall of the second mounting groove, and the other end is connected to the second piston block, and the second piston block is provided with a fourth connecting hole, and the fourth connecting hole is staggered with the second air inlet hole, and the second spring holds the second piston block against the inner bottom wall of the second receiving groove to block the second air inlet hole.

[0007] Furthermore, a first communicating port is provided at one end of the first spiral groove connected to the first mounting groove; when the first piston block is in contact with the inner bottom wall of the first receiving groove, the first piston block is separated from the first communicating port, and when the first piston block is completely moved into the first mounting groove, the first piston block blocks the first communicating port; a second communicating port is provided at one end of the second spiral groove connected to the second mounting groove; when the second piston block is in contact with the inner bottom wall of the second receiving groove, the second piston block is separated from the second communicating port, and when the second piston block is completely moved into the second mounting groove, the second piston block blocks the second communicating port.

[0008] Furthermore, the thin cylinder also includes a first temperature-sensitive bag and a second temperature-sensitive bag; the first temperature-sensitive bag is fixedly connected between the inner bottom wall of the first mounting groove and the first piston block, and the volume of the first temperature-sensitive bag increases when heated and decreases when cooled; the second temperature-sensitive bag is fixedly connected between the inner bottom wall of the second mounting groove and the second piston block, and the volume of the second temperature-sensitive bag increases when heated and decreases when cooled.

[0009] Furthermore, the separation piston can be movably accommodated in the third installation groove and the third receiving groove, and the separation piston can move under the action of an external force to block one of the first exhaust hole and the second exhaust hole.

[0010] Furthermore, the thin cylinder also includes a third spring, one end of the third spring is connected to the separation piston, and the other end is connected to the inner side wall of the third installation groove or the inner side wall of the third accommodating groove, and the third spring is used to support the separation piston.

[0011] Furthermore, the thin cylinder also includes a support rod, which is fixedly connected to the bottom wall of the inner tube and is located in the accommodating cavity; a limit mounting groove is provided on the side of the piston away from the sealing end cover, and a limit hole is provided on the inner bottom surface of the limit mounting groove, and the limit hole extends into the piston rod along the axial direction of the piston rod; a support ring is provided in the limit mounting groove, and a center hole coaxial with the limit hole is provided on the support ring, and at least part of the structure of the support rod passes through the center hole and is inserted into the limit hole; the aperture of the center hole is smaller than the aperture of the limit hole.

[0012] Furthermore, a first annular groove is provided on the inner side wall of the center hole, a first sealing ring is embedded in the first annular groove, and the first sealing ring is clamped by the support rod and the inner side wall of the first annular groove.

[0013] Furthermore, the inner side wall of the limiting hole is provided with a limiting groove extending along the axial direction of the limiting hole; the outer side wall of the support rod is provided with a fourth mounting groove, and a fourth spring is arranged in the fourth mounting groove, one end of the fourth spring abuts against the inner bottom wall of the fourth mounting groove, and the other end is connected to the limiting block, and the fourth spring holds the limiting block against the inner bottom wall of the limiting groove, and at least part of the structure of the limiting block is located in the fourth mounting groove.

[0014] Furthermore, a second annular groove is provided on the outer side wall of the piston, a second sealing ring is embedded in the second annular groove, and the second sealing ring is clamped by the piston and the inner side wall of the inner tube.

[0015] Furthermore, the outer wall of the outer tube is provided with a first air inlet pipe, a second air inlet pipe, a first exhaust pipe and a second exhaust pipe. The first air inlet pipe and the second air inlet pipe are both used to be connected to an air supply device, and the air supply device is used to transport high-pressure gas; the first air inlet pipe is connected to the first air inlet hole; the second air inlet pipe is connected to the second air inlet hole; the first exhaust pipe is connected to the first exhaust hole; the second exhaust pipe is connected to the second exhaust hole.

[0016] The beneficial effects of the present invention are:

[0017] Since the above-mentioned thin cylinder is provided with the first spiral groove and the second spiral groove, during the exhaust process of the thin cylinder, the gas is discharged by spirally flowing along the first spiral groove or the second spiral groove between the inner cylinder and the outer cylinder, which can take away part of the heat inside the thin cylinder, thereby realizing effective heat dissipation of the thin cylinder to avoid the temperature of the thin cylinder being too high and affecting its normal operation.

[0018] Furthermore, since the above-mentioned thin cylinder is provided with a first temperature-sensitive bag, when the thin cylinder is at a high temperature, the first temperature-sensitive bag can increase the amount of gas in the first chamber discharged from the first spiral groove, thereby improving the heat dissipation effect of the thin cylinder during the exhaust process, so as to avoid the negative impact of high temperature on the normal operation of the thin cylinder; when the thin cylinder is at a low temperature, the first temperature-sensitive bag can reduce the amount of gas in the first chamber discharged from the first spiral groove, thereby reducing the heat dissipation effect of the thin cylinder during the exhaust process, so as to avoid the problem that the lubricating effect of the lubricating oil is reduced due to the temperature of the thin cylinder being too low, condensed water is generated inside the cylinder and corrodes the lubricating oil, and other problems. Similarly, due to the provision of a second temperature-sensitive bag, when the thin cylinder is at high temperature, the second temperature-sensitive bag can increase the amount of gas in the second chamber discharged from the second spiral groove, thereby improving the heat dissipation effect of the exhaust process on the thin cylinder, so as to avoid the negative impact of high temperature on the normal operation of the thin cylinder; when the thin cylinder is at low temperature, the second temperature-sensitive bag can reduce the amount of gas in the second chamber discharged from the second spiral groove, thereby reducing the heat dissipation effect of the exhaust process on the thin cylinder, so as to avoid the negative impact of low temperature on the normal operation of the thin cylinder.

[0019] Furthermore, since the above-mentioned thin cylinder is provided with a support rod, a support ring and a limit hole, the support rod and the support ring can guide the movement of the piston and the piston rod to avoid the movement of the piston and the piston rod from being skewed as much as possible, thereby reducing the friction between the piston and the inner wall of the inner cylinder, and reducing the friction between the piston rod and the sealing end cover, which has the beneficial effect of improving the stability of the movement of the piston rod and reducing the wear of parts; and, since the support rod is arranged inside the inner cylinder, it occupies a small external space of the cylinder, which is beneficial to reducing the overall volume of the cylinder; through the above-mentioned arrangement, it can also avoid the piston rod being affected by the deflection force when it is extended, so that the piston excessively squeezes the inner wall of the inner cylinder and causes wear, and then causes the cylinder to fail.

[0020] Furthermore, since the above-mentioned thin cylinder is provided with a limiting hole and a first sealing ring, a sealed chamber can be formed inside the limiting hole. The above-mentioned sealed chamber can buffer the piston rod when the piston rod retracts, and can avoid the collision between the piston rod and the support rod, thereby protecting the safety of parts and extending the service life of parts; and, since the gas in the limiting hole will be compressed after the piston rod retracts, when the piston rod is extended next time, the compressed gas in the limiting hole can provide an initial power for the piston rod, so that the start-up of the piston rod is faster and smoother.

[0021] In summary, the above-mentioned thin cylinder can effectively dissipate heat and cool itself during use, thereby minimizing the negative impact caused by excessive temperature. Therefore, the above-mentioned thin cylinder has the advantages of good heat dissipation effect, stable and reliable operation, and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of a thin cylinder in one embodiment of the present invention;

[0023] Figure 2 for Figure 1 The schematic diagram of the structure of the thin cylinder shown in another perspective;

[0024] Figure 3 for Figure 2 The thin cylinder shown is a cross-sectional view in the AA direction;

[0025] Figure 4 for Figure 3 A magnified view of part A;

[0026] Figure 5 for Figure 3 A magnified view of part B;

[0027] Figure 6 for Figure 3 Enlarged view of part C;

[0028] Figure 7for Figure 3 A magnified view of part D in the middle;

[0029] Figure 8 for Figure 3 The structure shown is a schematic diagram of the structure from another perspective;

[0030] Fig. 9 for Figure 1 A schematic diagram of the structure of the inner tube of the thin cylinder shown;

[0031] Fig.10 for Fig. 9 Enlarged view of part E in the middle;

[0032] Fig.11 for Fig. 9 The structure shown is a schematic diagram of the structure from another perspective;

[0033] Fig.12 for Fig.11 Enlarged view of part F.

[0034] in:

[0035] 100, thin cylinder; 10, inner tube; 101, accommodating chamber; 1011, first chamber; 1012, second chamber; 102, mounting port; 103, first mounting groove; 104, second mounting groove; 105, third mounting groove; 106, first spiral groove; 1061, first connecting port; 107, second spiral groove; 1071, second connecting port; 108, first connecting hole; 109, second connecting hole; 11, sealing end cover; 12, piston rod; 13, piston; 131, limiting mounting groove; 132, limiting hole; 133, limiting groove; 134, second ring groove; 135, second sealing ring; 14, outer tube; 141, first accommodating groove; 142, second accommodating groove; 143, third accommodating groove ;144, first air inlet hole;145, second air inlet hole;146, first exhaust hole;147, second exhaust hole;15, separating piston;16, first spring;17, second spring;18, first piston block;181, third connecting hole;19, second piston block;191, fourth connecting hole;20, first temperature-sensing bag;21, second temperature-sensing bag;22, third spring;23, supporting rod;231, fourth mounting groove;232, fourth spring;233, limiting block;24, supporting ring;241, center hole;242, first ring groove;243, first sealing ring;25, first air inlet pipe;26, second air inlet pipe;27, first exhaust pipe;28, second exhaust pipe;29, connecting bolt;30, retaining spring. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0038] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] See also Figures 1 to 6 The present invention provides a thin cylinder 100, which includes an inner cylinder 10, a sealing end cover 11, a piston rod 12, a piston 13, an outer cylinder 14, a separating piston 15, a first spring 16 and a second spring 17.

[0040] The inner cylinder 10 is a generally cylindrical structure, one end of which is open and the other end is closed. The inner cylinder 10 is provided with a receiving chamber 101, and one end of the inner cylinder 10 is provided with a mounting opening 102 connected to the receiving chamber 101. The outer wall of the inner cylinder 10 is provided with a first mounting groove 103, a second mounting groove 104, a third mounting groove 105, a first spiral groove 106 and a second spiral groove 107 (please refer to Figures 9 to 12). The third mounting groove 105 is located between the first mounting groove 103 and the second mounting groove 104. The first spiral groove 106 and the second spiral groove 107 are both groove bodies spirally wrapped around the outer wall of the inner cylinder 10. One end of the first spiral groove 106 is connected to the first mounting groove 103, and the other end is connected to the third mounting groove 105. One end of the second spiral groove 107 is connected to the second mounting groove 104, and the other end is connected to the third mounting groove 105.

[0041] The sealing end cover 11 is a generally circular plate-shaped structure, which is connected to the inner barrel 10 and covers the mounting opening 102 to make the accommodating cavity 101 a closed cavity. Specifically, the sealing end cover 11 can be fixedly connected to the inner barrel through a retaining spring 30 disposed on the inner barrel 10.

[0042] The piston rod 12 is a generally cylindrical rod structure, which can be movably inserted into the sealing end cover 11. For example, the piston rod 12 can be arranged at the center of the sealing end cover 11, or at any other position, which is not limited.

[0043] The piston 13 is a generally round pancake-shaped structure, which is connected to one end of the piston rod 12 and is located in the accommodating chamber 101. The piston 13 contacts the inner side wall of the accommodating chamber 101 to separate the accommodating chamber 101 into a first chamber 1011 and a second chamber 1012 that are independent of each other. The first chamber 1011 is located between the piston 13 and the sealing end cover 11, and the second chamber 1012 is located between the piston 13 and the bottom wall of the inner cylinder 10. The first chamber 1011 is connected to the first mounting groove 103 through a first connecting hole 108 provided on the inner cylinder 10, and the second chamber 1012 is connected to the second mounting groove 104 through a second connecting hole 109 provided on the inner cylinder 10. Among them, the first connecting hole 108 and the second connecting hole 109 are both through holes.

[0044] The outer cylinder 14 is the main shell structure of the thin cylinder 100, and its outer shape is roughly rectangular. The outer cylinder 14 is sleeved on the outer periphery of the inner cylinder 10 and completely covers the outer side wall of the inner cylinder 10. Therefore, the outer cylinder 14 completely covers the first mounting groove 103, the second mounting groove 104, the third mounting groove 105, the first spiral groove 106 and the second spiral groove 107. As a specific example, in this embodiment, the outer cylinder 14 and the inner cylinder 10 are fixedly connected by a plurality of connecting bolts 29 penetrated thereon. In other embodiments, the outer cylinder 14 and the inner cylinder 10 can also be connected by other fasteners. The inner side wall of the outer cylinder 14 is provided with a first receiving groove 141, a second receiving groove 142 and a third receiving groove 143. The outer side wall of the outer cylinder 14 is provided with a first air inlet 144, a second air inlet 145, a first exhaust hole 146 and a second exhaust hole 147. The first air inlet 144 and the second air inlet 145 are used to connect with an air supply device (not shown in the figure), and the air supply device is used to deliver high-pressure gas. The first receiving groove 141 is arranged opposite to and communicated with the first mounting groove 103, and the first air inlet 144 is communicated with the first receiving groove 141. The second receiving groove 142 is arranged opposite to and communicated with the second mounting groove 104, and the second air inlet 145 is communicated with the second receiving groove 142. The third receiving groove 143 is arranged opposite to and communicated with the third mounting groove 105, the first exhaust hole 146 is communicated with the third receiving groove 143, and the second exhaust hole 147 is communicated with the third receiving groove 143. The first air inlet 144, the second air inlet 145, the first exhaust hole 146 and the second exhaust hole 147 are all through holes.

[0045] The separation piston 15 is a block structure whose shape matches the third mounting groove 105 and the third receiving groove 143. A portion of the separation piston 15 is accommodated in the third mounting groove 105, and another portion is accommodated in the third receiving groove 143. The separation piston 15 is in contact with the inner bottom wall of the third mounting groove 105 and the inner bottom wall of the third receiving groove 143. The separation piston 15 is used to separate the first spiral groove 106 from the second spiral groove 107.

[0046] One end of the first spring 16 is connected to the inner bottom wall of the first mounting groove 103, and the other end is connected to the first piston block 18. The first piston block 18 is a block structure whose shape is adapted to the first mounting groove 103 and the first receiving groove 141, and it can move in the first mounting groove 103 and the first receiving groove 141 along the radial direction of the piston rod 12. The first piston block 18 is provided with a third communication hole 181, which is a through hole, and the third communication hole 181 is staggered with the first air inlet hole 144. The first spring 16 holds the first piston block 18 against the inner bottom wall of the first receiving groove 141 to block the first air inlet hole 144. It should be noted that the above-mentioned “the third connecting hole 181 and the first air inlet hole 144 are offset from each other” means that there is no overlapping part between the third connecting hole 181 and the first air inlet hole 144. Therefore, when the first spring 16 holds the first piston block 18 against the inner bottom wall of the first accommodating groove 141, the first air inlet hole 144 and the third connecting hole 181 are separated from each other. At this time, the gas in the first air inlet hole 144 cannot enter the third connecting hole 181.

[0047] One end of the second spring 17 is connected to the inner bottom wall of the second mounting groove 104, and the other end is connected to the second piston block 19. The second piston block 19 is a block structure whose shape matches the second mounting groove 104 and the second receiving groove 142, and it can move in the second mounting groove 104 and the second receiving groove 142 along the radial direction of the piston rod 12. The second piston block 19 is provided with a fourth communication hole 191, which is a through hole, and the fourth communication hole 191 is staggered with the second air inlet hole 145. The second spring 17 holds the second piston block 19 against the inner bottom wall of the second receiving groove 142 to block the second air inlet hole 145. It should be noted that the above-mentioned “the fourth connecting hole 191 and the second air inlet hole 145 are offset” means that there is no overlapping part between the fourth connecting hole 191 and the second air inlet hole 145. Therefore, when the second spring 17 holds the second piston block 19 against the inner bottom wall of the second accommodating groove 142, the second air inlet hole 145 and the fourth connecting hole 191 are separated from each other. At this time, the gas in the second air inlet hole 145 cannot enter the fourth connecting hole 191.

[0048] The use process of the above-mentioned thin cylinder 100 is as follows: first, the first air inlet hole 144 and the second air inlet hole 145 are connected to the air supply device respectively, and the air supply device is used to supply high-pressure gas to the first air inlet hole 144 or the second air inlet hole 145; when the piston rod 12 needs to be shortened, the air supply device only supplies high-pressure gas to the first air inlet hole 144, and the high-pressure gas enters the first receiving groove 141 through the first air inlet hole 144, and at the same time impacts the first piston block 18 to separate the first piston block 18 from the inner bottom wall of the first receiving groove 141, and then a part of the high-pressure gas enters the first installation groove 103 through the third connecting hole 181, and enters the first chamber 1011 through the first connecting hole 108. As the gas continues to enter the first chamber 1011, the piston 13 will move in the direction away from the sealing end cover 11 to squeeze out the gas in the second chamber 1012, and the gas in the second chamber 1012 first enters the second mounting groove 104 through the second connecting hole 109. At this time, since the second air inlet hole 145 is blocked by the second piston block 19, the gas in the second mounting groove 104 can only enter the second spiral groove 107 and flow along the second spiral groove 107 to the third mounting groove 105. Then, the gas in the third mounting groove 105 is discharged from the thin cylinder 100 through the second exhaust hole 147; in the above exhaust process, the gas flows and is discharged along the second spiral groove 107 spirally around the outer wall of the inner cylinder 10, which can exhaust the inner cylinder 10 Part of the heat is taken away and discharged, thereby achieving the effect of cooling and lowering the temperature of the thin cylinder 100 when working; when the piston rod 12 needs to be extended, the air supply device only delivers high-pressure gas to the second air inlet hole 145, and the high-pressure gas enters the second receiving groove 142 through the second air inlet hole 145, and at the same time impacts the second piston block 19 to separate the second piston block 19 from the inner bottom wall of the second receiving groove 142, and then a part of the high-pressure gas enters the second installation groove 104 through the fourth connecting hole 191, and enters the second chamber 1012 through the second connecting hole 109. As the gas continues to enter the second chamber 1012, the piston 13 will move toward the direction close to the sealing end cover 11, thereby the gas in the first chamber 1011 will be The gas in the first chamber 1011 first enters the first mounting groove 103 through the first connecting hole 108. At this time, since the first air inlet hole 144 is blocked by the first piston block 18, the gas in the first mounting groove 103 can only enter the first spiral groove 106 and flow along the first spiral groove 106 to the third mounting groove 105. Then, the gas in the third mounting groove 105 is discharged from the thin cylinder 100 through the first exhaust hole 146. In the above-mentioned exhaust process, the gas flows and is discharged along the first spiral groove 106 spirally around the outer wall of the inner cylinder 10, which can take away part of the heat inside the inner cylinder 10 and discharge it, thereby achieving a cooling effect to reduce the temperature of the thin cylinder 100 during operation.

[0049] Through the above arrangement, when the gas in the cylinder is discharged to the outside during use of the thin cylinder 100, the gas will pass through one of the first spiral groove 106 and the second spiral groove 107, so that the gas can spirally surround the outer wall of the inner cylinder 10, thereby taking away part of the heat in the inner cylinder 10 and discharging it, so as to achieve the effect of reducing the temperature in the cylinder. In summary, the thin cylinder 100 can effectively dissipate heat and cool itself during use, thereby avoiding negative effects caused by excessive temperature. Therefore, the thin cylinder 100 has the advantages of good heat dissipation effect, stable and reliable operation, and long service life.

[0050] See also Figures 3 to 6 In some embodiments, the first spiral groove 106 is provided with a first communication port 1061 (see Figure 4 ). When the first piston block 18 is in contact with the inner bottom wall of the first receiving groove 141, the first piston block 18 is separated from the first communication port 1061 to achieve communication between the first spiral groove 106 and the first mounting groove 103. When the first piston block 18 is completely moved into the first mounting groove 103, the first piston block 18 blocks the first communication port 1061 to achieve separation of the first spiral groove 106 and the first mounting groove 103, and when the first piston block 18 is completely moved into the first mounting groove 103, the first communication hole 108 and the third communication hole 181 are still connected. The end of the second spiral groove 107 that is connected to the second mounting groove 104 is provided with a second communication port 1071 (see Figure 6 ). When the second piston block 19 is in contact with the inner bottom wall of the second receiving groove 142, the second piston block 19 is separated from the second communication port 1071 to achieve communication between the second spiral groove 107 and the second installation groove 104. When the second piston block 19 is completely moved into the second installation groove 104, the second piston block 19 blocks the second communication port 1071 to achieve separation of the second spiral groove 107 and the second installation groove 104, and when the second piston block 19 is completely moved into the second installation groove 104, the second communication hole 109 and the fourth communication hole 191 are still connected.

[0051] Through the above-mentioned arrangement, when the piston rod 12 needs to be shortened, the air supply device only delivers high-pressure gas to the first air inlet hole 144, and the high-pressure gas enters the first accommodating groove 141 through the first air inlet hole 144, and at the same time impacts the first piston block 18 so that the first piston block 18 moves completely into the first mounting groove 103. At this time, since the first piston block 18 blocks the first connecting port 1061, the high-pressure gas cannot enter the first spiral groove 106 and be discharged from the cylinder. The high-pressure gas can only enter the first chamber 1011 along the third connecting hole 181 and the first connecting hole 108. When the piston rod 12 needs to be extended, the air supply device only delivers high-pressure gas to the second air inlet 145, and the high-pressure gas enters the second receiving groove 142 through the second air inlet 145, and at the same time impacts the second piston block 19 so that the second piston block 19 moves completely into the second installation groove 104. At this time, since the second piston block 19 blocks the second connecting port 1071, the high-pressure gas cannot enter the second spiral groove 107 and be discharged from the cylinder, and the high-pressure gas can only enter the second chamber 1012 along the fourth connecting hole 191 and the second connecting hole 109. In summary, the above arrangement can minimize the leakage of high-pressure gas when entering the thin cylinder 100, thereby ensuring the stability and reliability of the operation of the thin cylinder 100.

[0052] In some embodiments, the thin cylinder 100 further includes a first temperature sensing package 20 (see Figure 4 ) and the second temperature sensing package 21 (see Figure 6 ). The first temperature-sensing bag 20 is fixedly connected between the inner bottom wall of the first mounting groove 103 and the first piston block 18, for example, it can be an adhesive connection. The volume of the first temperature-sensing bag 20 increases when heated, and the volume decreases when cooled. The second temperature-sensing bag 21 is fixedly connected between the inner bottom wall of the second mounting groove 104 and the second piston block 19, for example, it can be an adhesive connection. The volume of the second temperature-sensing bag 21 increases when heated, and the volume decreases when cooled. As a specific example, the first temperature-sensing bag 20 and the second temperature-sensing bag 21 are both airbag structures filled with gas and have retractable characteristics. When the temperature rises, the volume of the first temperature-sensing bag 20 and the second temperature-sensing bag 21 can expand and increase, and when the temperature decreases, the volume of the first temperature-sensing bag 20 and the second temperature-sensing bag 21 can shrink and decrease.

[0053] Through the above arrangement, when the piston rod 12 needs to be shortened and the temperature of the thin cylinder 100 is high, the air supply device only delivers high-pressure gas to the first air inlet hole 144, and the high-pressure gas enters the first receiving groove 141 through the first air inlet hole 144, and at the same time impacts the first piston block 18 to separate the first piston block 18 from the inner bottom wall of the first receiving groove 141. At this time, since the pressure of the first piston block 18 on the first temperature-sensitive bag 20 is much greater than the force of the first temperature-sensitive bag 20 due to thermal expansion, the first temperature-sensitive bag 20 will be squeezed by the first piston block 18 without affecting the movement of the first piston block 18, and the high-pressure gas can smoothly enter the first chamber 1011 along the third connecting hole 181 and the first connecting hole 108, so that the first chamber The volume of 1011 increases to squeeze the gas in the second chamber 1012 to be discharged outward. Under the influence of high temperature, the volume of the second temperature-sensing bag 21 will also expand and increase. Therefore, the second temperature-sensing bag 21 can also provide a force for the second piston block 19 to make the second piston block 19 as close to the inner bottom wall of the second accommodating groove 142 as possible. While ensuring that the second piston block 19 completely blocks the second air inlet 145, the second piston block 19 is avoided from blocking the second connecting port 1071 as much as possible, so that the gas in the second chamber 1012 can enter the second spiral groove 107 as much as possible and be discharged from the cylinder body through the second exhaust hole 147, so as to improve the heat dissipation efficiency and heat dissipation effect of the thin cylinder 100 during the exhaust process.

[0054] When the piston rod 12 needs to be shortened and the temperature of the thin cylinder 100 is low, the first temperature-sensing bag 20 does not affect the air intake of the first chamber 1011, but the second temperature-sensing bag 21 shrinks in volume due to the low temperature environment, and will pull the second piston block 19 to separate from the inner bottom wall of the second accommodating groove 142. At this time, at least part of the structure of the second piston block 19 will enter the second mounting groove 104 and block at least part of the second connecting port 1071. Therefore, part of the gas discharged from the second chamber 1012 will be discharged from the cylinder body through the second air inlet 145, and the other part will enter the second spiral groove 107 and be discharged from the cylinder body through the second exhaust hole 147, thereby reducing the amount of gas entering the second spiral groove 107, thereby reducing the heat dissipation efficiency and heat dissipation effect of the thin cylinder 100 during the exhaust process.

[0055] When the piston rod 12 needs to be extended and the temperature of the thin cylinder 100 is high, the air supply device only delivers high-pressure gas to the second air inlet hole 145, and the high-pressure gas enters the second receiving groove 142 through the second air inlet hole 145, and at the same time impacts the second piston block 19 to separate the second piston block 19 from the inner bottom wall of the second receiving groove 142. At this time, since the pressure of the second piston block 19 on the second temperature-sensitive bag 21 is much greater than the force of the second temperature-sensitive bag 21 due to thermal expansion, the second temperature-sensitive bag 21 will be squeezed by the second piston block 19 without affecting the movement of the second piston block 19, and the high-pressure gas can smoothly enter the second chamber 1012 along the fourth connecting hole 191 and the second connecting hole 109, so that the second chamber 101 2 increases in volume to squeeze the gas in the first chamber 1011 to be discharged outwardly. Under the influence of high temperature, the volume of the first temperature-sensing package 20 will also expand and increase at this time. Therefore, the first temperature-sensing package 20 can also provide a force for the first piston block 18 to make the first piston block 18 as close to the inner bottom wall of the first accommodating groove 141 as possible. While ensuring that the first piston block 18 completely blocks the first air inlet hole 144, the first piston block 18 is avoided from blocking the first connecting port 1061 as much as possible, so that the gas in the first chamber 1011 can enter the first spiral groove 106 as much as possible and be discharged from the cylinder body through the first exhaust hole 146, so as to improve the heat dissipation efficiency and heat dissipation effect of the thin cylinder 100 during the exhaust process.

[0056] When the piston rod 12 needs to be extended and the temperature of the thin cylinder 100 is low, the second temperature-sensing bag 21 does not affect the air intake of the second chamber 1012, but the first temperature-sensing bag 20 shrinks in volume due to the low temperature environment, and will pull the first piston block 18 to separate from the inner bottom wall of the first accommodating groove 141. At this time, at least part of the structure of the first piston block 18 will enter the first mounting groove 103 and block at least part of the first connecting port 1061. Therefore, part of the gas discharged from the first chamber 1011 will be discharged from the cylinder body through the first air inlet hole 144, and the other part will enter the first spiral groove 106 and be discharged from the cylinder body through the first exhaust hole 146, thereby reducing the amount of gas entering the first spiral groove 106, thereby reducing the heat dissipation efficiency and heat dissipation effect of the thin cylinder 100 during the exhaust process.

[0057] See also Figure 3 , Figure 5 as well as Figure 8 In some embodiments, the separation piston 15 can be movably accommodated in the third installation groove 105 and the third receiving groove 143 , and the separation piston 15 can move under the action of external force to block one of the first exhaust hole 146 and the second exhaust hole 147 .

[0058] Specifically, when the piston rod 12 needs to be shortened, the air supply device only delivers high-pressure gas to the first chamber 1011 through the first air inlet hole 144. The continuous increase in the volume of the first chamber 1011 will squeeze the gas in the second chamber 1012 into the second spiral groove 107. Under the action of the gas impact, the separating piston 15 can move toward the sealing end cover 11, thereby blocking the first exhaust hole 146. At this time, the gas in the second spiral groove 107 can be smoothly discharged from the cylinder body through the second exhaust hole 147. Since the separating piston 15 blocks the first exhaust hole 146, the separating piston 15 can try to prevent the gas that accidentally enters the first spiral groove 106 during the intake process from being discharged from the first exhaust hole 146, thereby allowing the high-pressure gas to enter the first chamber 1011 as much as possible during the intake process, so as to drive the piston 13 and the piston rod 12.

[0059] When the piston rod 12 needs to be extended, the air supply device only delivers high-pressure gas to the second chamber 1012 through the second air inlet hole 145. The continuous increase in the volume of the second chamber 1012 will squeeze the gas in the first chamber 1011 into the first spiral groove 106. Under the action of the gas impact, the separating piston 15 can move away from the sealing end cover 11, thereby blocking the second exhaust hole 147. At this time, the gas in the first spiral groove 106 can be smoothly discharged from the cylinder body through the first exhaust hole 146. Since the separating piston 15 blocks the second exhaust hole 147, the separating piston 15 can try its best to prevent the gas that accidentally enters the second spiral groove 107 during the intake process from being discharged from the second exhaust hole 147, so that the high-pressure gas can enter the second chamber 1012 as much as possible during the intake process, so as to realize the driving of the piston 13 and the piston rod 12.

[0060] Please continue reading Figure 3 , Figure 5 as well as Figure 8In some embodiments, the thin cylinder 100 further includes a third spring 22, one end of the third spring 22 is connected to the separation piston 15, and the other end is connected to the inner side wall of the third installation groove 105 or the inner side wall of the third receiving groove 143, and the third spring 22 is used to support the separation piston 15. Specifically, the end of the third spring 22 away from the separation piston 15 can be connected to the inner side wall of the third installation groove 105, and can also be connected to the inner side wall of the third receiving groove 143. The third spring 22 is used to support the separation piston 15. When there is no gas impacting the separation piston 15, the third spring 22 can support the third spring 22 so that the third spring 22 is stably located between the first exhaust hole 146 and the second exhaust hole 147. When the piston rod 12 needs to be shortened, the gas in the second spiral groove 107 impacts the separation piston 15 so that the separation piston 15 overcomes the elastic force of the third spring 22 and moves toward the sealing end cover 11 to block the first exhaust hole 146. When the piston rod 12 needs to be extended, the gas in the first spiral groove 106 impacts the separation piston 15 so that the separation piston 15 overcomes the elastic force of the third spring 22 and moves away from the sealing end cover 11 to block the second exhaust hole 147. Through the above arrangement, the third spring 22 can provide support for the separation piston 15, so that the movement of the split piston 13 is easier and more convenient.

[0061] See also Figure 3 , Figure 7 as well as Figure 8 In some embodiments, the thin cylinder 100 further includes a support rod 23, which is a roughly round rod-shaped structure. The support rod 23 is fixedly connected to the bottom wall of the inner tube 10 and is located in the accommodating chamber 101. A limiting installation groove 131 is provided on the side of the piston 13 away from the sealing end cover 11. The limiting installation groove 131 is a circular groove. The inner bottom surface of the limiting installation groove 131 is provided with a limiting hole 132. The limiting hole 132 extends into the piston rod 12 along the axial direction of the piston rod 12. A support ring 24 is provided in the limiting installation groove 131. The support ring 24 is a roughly circular ring-shaped structure. A center hole 241 coaxial with the limiting hole 132 is provided on the support ring 24. The center hole 241 is a through hole. At least part of the structure of the support rod 23 passes through the center hole 241 and is inserted into the limiting hole 132. The aperture of the center hole 241 is smaller than the aperture of the limiting hole 132.

[0062] Through the above arrangement, when the piston rod 12 and the piston 13 move synchronously, the support rod 23 cooperates with the support ring 24 to guide the movement of the piston 13 and the piston rod 12, so as to avoid the piston 13 and the piston rod 12 from being skewed and offset during the movement, thereby reducing the friction between the piston 13 and the inner wall of the inner cylinder 10, reducing the friction between the piston rod 12 and the sealing end cover 11, and then reducing the heat generated by friction, and also reducing the wear of parts and extending the service life of the thin cylinder 100. In addition, since the support rod 23 is arranged inside the inner cylinder 10, it occupies a small external space of the cylinder, which is conducive to reducing the overall volume of the cylinder. Further, since the aperture of the center hole 241 is smaller than the aperture of the limit hole 132, and the center hole 241, the limit hole 132 and the support rod 23 are all coaxially arranged. Therefore, the portion of the support rod 23 inserted into the limiting hole 132 does not contact the inner wall of the limiting hole 132, so during the movement of the piston rod 12 relative to the support rod 23, no friction occurs between the piston rod 12 and the support rod 23, thereby avoiding frictional heat generation between the piston rod 12 and the support rod 23, and avoiding wear of the piston rod 12 and the support rod 23 due to friction.

[0063] In some embodiments, the inner wall of the center hole 241 is provided with a first annular groove 242, and a first sealing ring 243 is embedded in the first annular groove 242. The first sealing ring 243 is clamped by the support rod 23 and the inner wall of the first annular groove 242. Through the above arrangement, the first sealing ring 243 forms a sealing structure between the support rod 23 and the inner wall of the first annular groove 242, so that the inner cavity of the limiting hole 132 becomes a closed cavity. Therefore, when the piston rod 12 retracts, the gas in the limiting hole 132 can buffer the piston rod 12, thereby avoiding the collision between the piston rod 12 and other parts as much as possible, which can protect the piston rod 12 and other parts, thereby achieving the effect of extending the service life of the thin cylinder 100. In addition, since the piston rod 12 will compress the gas in the limiting hole 132 after retraction, when the piston rod 12 is extended next time, the compressed gas in the limiting hole 132 can provide an initial power for the piston rod 12, so that the start of the piston rod 12 is faster and smoother.

[0064] In some embodiments, the inner side wall of the limiting hole 132 is provided with a limiting groove 133 extending along the axial direction of the limiting hole 132. The outer side wall of the support rod 23 is provided with a fourth mounting groove 231, and a fourth spring 232 is arranged in the fourth mounting groove 231. One end of the fourth spring 232 abuts against the inner bottom wall of the fourth mounting groove 231, and the other end is connected to the limiting block 233. The limiting block 233 can be a block structure or a rod structure. The fourth spring 232 holds the limiting block 233 against the inner bottom wall of the limiting groove 133, and at least part of the structure of the limiting block 233 is located in the fourth mounting groove 231.

[0065] Through the above-mentioned arrangement, during the movement of the piston rod 12 relative to the support rod 23, the position of the limit block 233 in the limit groove 133 changes all the time. Since the fourth spring 232 holds the limit block 233 against the inner bottom wall of the limit groove 133, and at least part of the structure of the limit block 233 is located in the fourth mounting groove 231, the limit block 233 can guide the movement of the piston rod 12, and the limit block 233 can also prevent the piston rod 12 from rotating relative to the support rod 23 during the movement, thereby further improving the stability and reliability of the movement of the piston rod 12.

[0066] See also Figure 3 and Figure 5 In some embodiments, the outer wall of the piston 13 is provided with a second annular groove 134, and a second sealing ring 135 is embedded in the second annular groove 134. The second sealing ring 135 is clamped by the piston 13 and the inner wall of the inner tube 10. Through the above arrangement, the second sealing ring 135 forms a sealing structure between the outer wall of the piston 13 and the inner wall of the inner tube 10, so that the first chamber 1011 and the second chamber 1012 are isolated from each other, thereby preventing the first chamber 1011 and the second chamber 1012 from affecting the normal movement of the piston rod 12 due to air leakage.

[0067] See also Figure 1 and Figure 2 In some embodiments, the outer wall of the outer cylinder 14 is provided with a first air inlet pipe 25, a second air inlet pipe 26, a first exhaust pipe 27 and a second exhaust pipe 28. The first air inlet pipe 25 and the second air inlet pipe 26 are both used to connect with an air supply device, and the air supply device is used to deliver high-pressure gas. The first air inlet pipe 25 is connected to the first air inlet hole 144, the second air inlet pipe 26 is connected to the second air inlet hole 145, the first exhaust pipe 27 is connected to the first exhaust hole 146, and the second exhaust pipe 28 is connected to the second exhaust hole 147. Through the above arrangement, the first air inlet pipe 25 is used to realize the communication between the air supply device and the first air inlet hole 144, the second air inlet pipe 26 is used to realize the communication between the air supply device and the second air inlet hole 145, the first exhaust pipe 27 is used to discharge the gas in the first spiral groove 106 out of the cylinder, and the second exhaust pipe 28 is used to discharge the gas in the second spiral groove 107 out of the cylinder.

[0068] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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.

[0069] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A thin cylinder, characterized in that: include: An inner cylinder (10) is provided with a receiving cavity (101); one end of the inner cylinder (10) is provided with a mounting opening (102) communicating with the receiving cavity (101); an outer wall of the inner cylinder (10) is provided with a first mounting groove (103), a second mounting groove (104), a third mounting groove (105), a first spiral groove (106) and a second spiral groove (107); the third mounting groove (105) is located between the first mounting groove (103) and the second mounting groove (104); one end of the first spiral groove (106) is communicated with the first mounting groove (103), and the other end is communicated with the third mounting groove (105); one end of the second spiral groove (107) is communicated with the second mounting groove (104), and the other end is communicated with the third mounting groove (105); A sealing end cover (11) connected to the inner cylinder (10) and sealing the installation opening (102); A piston rod (12) movably penetrates the sealing end cover (11); a piston (13) connected to one end of the piston rod (12) and located in the accommodating chamber (101); the piston (13) contacts the inner side wall of the accommodating chamber (101) to separate the accommodating chamber (101) into a first chamber (1011) and a second chamber (1012) which are independent of each other; the first chamber (1011) is located between the piston (13) and the sealing end cover (11); the first chamber (1011) is connected to the first mounting groove (103) via a first communicating hole (108) provided on the inner cylinder (10); and the second chamber (1012) is connected to the second mounting groove (104) via a second communicating hole (109) provided on the inner cylinder (10); The outer cylinder (14) is sleeved on the outer circumference of the inner cylinder (10) and completely covers the outer wall of the inner cylinder (10); the inner wall of the outer cylinder (14) is provided with a first receiving groove (141), a second receiving groove (142) and a third receiving groove (143); the outer wall of the outer cylinder (14) is provided with a first air inlet hole (144), a second air inlet hole (145), a first exhaust hole (146) and a second exhaust hole (147); the first receiving groove (141) is arranged opposite to the first mounting groove (103) and is in communication with the first mounting groove (103). , the first air inlet (144) is in communication with the first receiving groove (141); the second receiving groove (142) is arranged opposite to and in communication with the second mounting groove (104), and the second air inlet (145) is in communication with the second receiving groove (142); the third receiving groove (143) is arranged opposite to and in communication with the third mounting groove (105), the first exhaust hole (146) is in communication with the third receiving groove (143), and the second exhaust hole (147) is in communication with the third receiving groove (143); a separation piston (15), a portion of which is accommodated in the third installation groove (105) and another portion of which is accommodated in the third receiving groove (143), the separation piston (15) separating the first spiral groove (106) from the second spiral groove (107); a first spring (16), one end of which is connected to the inner bottom wall of the first mounting groove (103), and the other end of which is connected to a first piston block (18); a third communicating hole (181) is provided on the first piston block (18); the third communicating hole (181) and the first air inlet hole (144) are arranged offset; the first spring (16) holds the first piston block (18) against the inner bottom wall of the first containing groove (141) to block the first air inlet hole (144); a second spring (17), one end of which is connected to the inner bottom wall of the second mounting groove (104), and the other end of which is connected to a second piston block (19); a fourth communicating hole (191) is provided on the second piston block (19); the fourth communicating hole (191) and the second air inlet hole (145) are arranged offset from each other; the second spring (17) holds the second piston block (19) against the inner bottom wall of the second containing groove (142) to block the second air inlet hole (145); The outer wall of the outer cylinder (14) is provided with a first air intake pipe (25), a second air intake pipe (26), a first exhaust pipe (27) and a second exhaust pipe (28); the first air intake pipe (25) and the second air intake pipe (26) are both used to be connected to an air supply device, and the air supply device is used to deliver high-pressure gas; the first air intake pipe (25) is communicated with the first air intake hole (144); the second air intake pipe (26) is communicated with the second air intake hole (145); the first exhaust pipe (27) is communicated with the first exhaust hole (146); the second exhaust pipe (28) is communicated with the second exhaust hole (147); A first communication port (1061) is provided at one end of the first spiral groove (106) that is connected to the first installation groove (103); when the first piston block (18) is in contact with the inner bottom wall of the first receiving groove (141), the first piston block (18) is separated from the first communication port (1061); when the first piston block (18) is completely moved into the first installation groove (103), the first piston block (18) blocks the first communication port (1061); A second connecting port (1071) is provided at one end of the second spiral groove (107) that is connected to the second mounting groove (104); when the second piston block (19) is in contact with the inner bottom wall of the second receiving groove (142), the second piston block (19) is separated from the second connecting port (1071); when the second piston block (19) is completely moved into the second mounting groove (104), the second piston block (19) blocks the second connecting port (1071).

2. The thin cylinder according to claim 1, characterized in that: The thin cylinder further comprises a first temperature-sensing package (20) and a second temperature-sensing package (21); the first temperature-sensing package (20) is fixedly connected between the inner bottom wall of the first mounting groove (103) and the first piston block (18); the volume of the first temperature-sensing package (20) increases when heated and decreases when cooled; the second temperature-sensing package (21) is fixedly connected between the inner bottom wall of the second mounting groove (104) and the second piston block (19); the volume of the second temperature-sensing package (21) increases when heated and decreases when cooled.

3. The thin cylinder according to claim 1, characterized in that: The separation piston (15) can be movably accommodated in the third installation groove (105) and the third receiving groove (143), and the separation piston (15) can move under the action of external force to block one of the first exhaust hole (146) and the second exhaust hole (147).

4. The thin cylinder according to claim 3, characterized in that: The thin cylinder further comprises a third spring (22), one end of the third spring (22) being connected to the separation piston (15), and the other end being connected to the inner side wall of the third mounting groove (105) or the inner side wall of the third receiving groove (143), and the third spring (22) being used to support the separation piston (15).

5. The thin cylinder according to any one of claims 1 to 4, characterized in that: The thin cylinder further comprises a support rod (23), the support rod (23) being fixedly connected to the bottom wall of the inner tube (10) and being located in the accommodating chamber (101); a limiting installation groove (131) is provided on the side of the piston (13) away from the sealing end cover (11), a limiting hole (132) is provided on the inner bottom surface of the limiting installation groove (131), and the limiting hole (132) extends into the piston rod (12) along the axial direction of the piston rod (12); a support ring (24) is provided in the limiting installation groove (131), a center hole (241) coaxial with the limiting hole (132) is provided on the support ring (24), and at least a part of the structure of the support rod (23) passes through the center hole (241) and is inserted into the limiting hole (132); the diameter of the center hole (241) is smaller than the diameter of the limiting hole (132).

6. The thin cylinder according to claim 5, characterized in that: The inner side wall of the center hole (241) is provided with a first annular groove (242), a first sealing ring (243) is embedded in the first annular groove (242), and the first sealing ring (243) is clamped by the support rod (23) and the inner side wall of the first annular groove (242).

7. The thin cylinder according to claim 5, characterized in that: The inner side wall of the limiting hole (132) is provided with a limiting groove (133) extending along the axial direction of the limiting hole (132); the outer side wall of the support rod (23) is provided with a fourth installation groove (231), and a fourth spring (232) is arranged in the fourth installation groove (231), one end of the fourth spring (232) is abutted against the inner bottom wall of the fourth installation groove (231), and the other end is connected to the limiting block (233), the fourth spring (232) holds the limiting block (233) against the inner bottom wall of the limiting groove (133), and at least part of the structure of the limiting block (233) is located in the fourth installation groove (231).

8. The thin cylinder according to claim 1, characterized in that: The outer side wall of the piston (13) is provided with a second annular groove (134), a second sealing ring (135) is embedded in the second annular groove (134), and the second sealing ring (135) is clamped by the piston (13) and the inner side wall of the inner cylinder (10).

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