A multi-stage cylinder

Abstract

The present invention discloses a multi-stage cylinder, which relates to the technical field of cylinders, and comprises a first cylinder, a plurality of telescopic mechanisms nested in sequence, a piston, and a piston rod connected to the piston, wherein the first cylinder comprises a first cylinder barrel, and the first cylinder cover and the first cylinder bottom fixedly and sealedly connected thereto are respectively arranged on the left and right sides of the first cylinder barrel, the outermost telescopic mechanism is slidably and sealedly connected to the inner surface of the first cylinder and extends out of the first cylinder cover, the piston is slidably and sealedly connected to the inner surface of the innermost telescopic mechanism and extends out of the innermost telescopic mechanism, and the first cylinder and each telescopic mechanism are independently provided with an airway for driving the corresponding telescopic mechanism. The present invention can solve the problem that the existing multi-stage cylinder cannot independently realize fixed-length extension and cannot control the independent extension of several stages therein.

Description

Technical Field

[0001] The invention relates to the technical field of cylinders, in particular to a multi-stage cylinder. Background Art

[0002] A cylinder is a cylindrical metal part that guides a piston to perform linear reciprocating motion in the cylinder. It is generally used for linear drive.

[0003] Existing cylinders are generally single-stage cylinders, which require a relatively long installation space and cannot be installed in a relatively short space. Since the air intake and air output cannot be precisely controlled, the piston rod of a single-stage cylinder cannot be extended to a fixed length. Therefore, people have developed multi-stage cylinders. However, although the existing multi-stage cylinders can be installed in a relatively small space, their piston rods still cannot be extended to a fixed length and require an external control device to achieve the effect of fixed length extension. The existing multi-stage cylinders also cannot control the extension and retraction of several stages individually. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a multi-stage cylinder to solve the problem that the existing multi-stage cylinder cannot independently achieve fixed-length extension and cannot control the independent extension and retraction of several stages therein.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a multi-stage cylinder, including a first cylinder, a plurality of telescopic mechanisms nested in sequence, a piston and a piston rod connected to the piston, the first cylinder including a first cylinder barrel, the left and right sides of the first cylinder barrel are respectively provided with a first cylinder cover and a first cylinder bottom fixedly sealed therewith, the outermost telescopic mechanism is slidingly and sealingly connected to the inner surface of the first cylinder and extends from the first cylinder cover, the piston is slidingly and sealingly connected to the inner surface of the innermost telescopic mechanism and extends from the innermost telescopic mechanism, the first cylinder and each telescopic mechanism are independently provided with an air passage for driving the corresponding telescopic mechanism or piston.

[0006] Furthermore, the first cylinder barrel is fixedly and sealedly connected to the first cylinder head and the first cylinder bottom via four tie rods.

[0007] Furthermore, the number of the telescopic mechanisms is two, and the telescopic mechanism includes a telescopic mechanism cylinder, and a telescopic mechanism cylinder cover and a telescopic mechanism cylinder bottom are respectively arranged on the left and right sides of the telescopic mechanism cylinder, which are fixedly sealed and connected thereto, a first gap is formed between the outer telescopic mechanism cylinder and the first cylinder, a first air outlet hole connected to the first gap is arranged on the first cylinder cover, a first groove connected to the inner cavity of the first cylinder is arranged at the center position of the first cylinder bottom, a first air inlet hole connected to the first groove is arranged on the first cylinder bottom, and the outer telescopic mechanism cylinder bottom slides with the inner surface of the first cylinder Sealed connection, the outer telescopic mechanism cylinder is slidably sealed with the inner surface of the first cylinder head, the left end of the telescopic mechanism cylinder bottom is sequentially provided with the first reduced diameter portion of the telescopic mechanism cylinder bottom and the second reduced diameter portion of the telescopic mechanism cylinder bottom, the diameter of the second reduced diameter portion of the telescopic mechanism cylinder bottom is smaller than the first reduced diameter portion of the telescopic mechanism cylinder bottom, the first reduced diameter portion of the telescopic mechanism cylinder bottom is threadedly sealed with the corresponding telescopic mechanism cylinder, the outer periphery of the second reduced diameter portion of the telescopic mechanism cylinder bottom is sleeved with a liner sealed and fixed thereto, the right end of the telescopic mechanism cylinder head is sequentially provided with the first reduced diameter portion of the telescopic mechanism cylinder head and the telescopic mechanism cylinder head The second reduced diameter part, the diameter of the second reduced diameter part of the telescopic mechanism cylinder cover is smaller than the first reduced diameter part of the telescopic mechanism cylinder cover, the first reduced diameter part of the telescopic mechanism cylinder cover is threadedly sealed and connected with the corresponding telescopic mechanism cylinder barrel, the left end of the liner is sleeved on the outer periphery of the second reduced diameter part of the telescopic mechanism cylinder cover and is sealed and fixedly connected with it, a second gap is formed between the liner and the telescopic mechanism cylinder barrel, a second air inlet hole connected with the second gap is arranged on the telescopic mechanism cylinder cover, a telescopic mechanism cylinder bottom groove connected with the inner cavity of the telescopic mechanism cylinder barrel is arranged at the center position of the telescopic mechanism cylinder bottom, and the telescopic mechanism cylinder bottom is also provided with a The corresponding second gap is connected to the telescopic mechanism cylinder bottom air passage which is connected to the telescopic mechanism cylinder bottom groove, the inner telescopic mechanism cylinder bottom is slidingly and sealingly connected to the inner surface of the outer liner, the inner telescopic mechanism cylinder barrel is slidingly and sealingly connected to the inner surface of the outer telescopic mechanism cylinder cover, the piston is slidingly and sealingly connected to the inner surface of the inner liner, the piston rod is slidingly and sealingly connected to the inner surface of the inner telescopic mechanism cylinder cover, a third gap is formed between the outer liner and the inner telescopic mechanism cylinder barrel, and between the inner liner and the piston rod, and a second air outlet connected to the third gap is arranged on the telescopic mechanism cylinder cover.

[0008] Furthermore, the left side of the telescopic mechanism cylinder is threadedly connected to the corresponding telescopic mechanism cylinder cover, and the right side is threadedly connected to the corresponding telescopic mechanism cylinder bottom.

[0009] Furthermore, the liner is interference-connected with the second reduced diameter portion of the telescopic mechanism cylinder bottom and the second reduced diameter portion of the telescopic mechanism cylinder cover.

[0010] Furthermore, the liner is made of stainless steel or aluminum alloy.

[0011] Furthermore, sealing rings are correspondingly provided at the sliding seal and the threaded seal of the multi-stage cylinder.

[0012] The present invention has the following beneficial effects:

[0013] The multi-stage cylinder of the present invention is provided with a plurality of sequentially nested telescopic mechanisms, pistons and piston rods in the first cylinder, and the first cylinder and each telescopic mechanism are independently provided with air passages for driving the corresponding telescopic mechanisms or pistons. When in use, the operator connects an air pipe to each independently provided air passage, and can control any telescopic mechanism and piston to fully extend or fully retract as required, thereby completing the fixed-length extension of the multi-stage cylinder, and also achieving the effect of controlling the individual extension and retraction of several stages in the multi-stage cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a cross-sectional view of the present invention;

[0015] Figure 2 It is a right side view of the present invention;

[0016] Figure 3 It is a schematic diagram of the gas path when each structure of the present invention moves to the left;

[0017] Figure 4 It is a schematic diagram of the gas path when each structure of the present invention moves to the right. DETAILED DESCRIPTION

[0018] Embodiment 1:

[0019] like Figure 1-4 As shown, a multi-stage cylinder includes a first cylinder 1, a plurality of telescopic mechanisms 2 nested in sequence, a piston 3 and a piston rod 4 connected to the piston 3, wherein the first cylinder 1 includes a first cylinder barrel 12, and the left and right sides of the first cylinder barrel 12 are respectively provided with a first cylinder cover 11 and a first cylinder bottom 13 fixedly sealed and connected thereto, the outermost telescopic mechanism 2 is slidably and sealedly connected to the inner surface of the first cylinder 1 and extends from the first cylinder cover 11, the piston 3 is slidably and sealedly connected to the inner surface of the innermost telescopic mechanism 2 and extends from the innermost telescopic mechanism 2, and the first cylinder 1 and each telescopic mechanism 2 are independently provided with an air passage for driving the corresponding telescopic mechanism 2 or the piston 3.

[0020] The first cylinder 1 is configured to drive the air passage of the outermost telescopic mechanism 2 , the outer telescopic mechanism 2 is configured to drive the air passage of the inner telescopic mechanism 2 , and the innermost telescopic mechanism 2 is configured to drive the air passage of the piston 3 .

[0021] The multi-stage cylinder of the present invention is provided with a plurality of sequentially nested telescopic mechanisms, pistons and piston rods in the first cylinder, and the first cylinder and each telescopic mechanism are independently provided with air passages for driving the corresponding telescopic mechanisms or pistons. When in use, the operator connects an air pipe to each independently provided air passage, and can control any telescopic mechanism and piston to fully extend or fully retract as required, thereby completing the fixed-length extension of the multi-stage cylinder, and also achieving the effect of controlling the individual extension and retraction of several stages in the multi-stage cylinder.

[0022] The first cylinder barrel 12 is fixedly and sealedly connected to the first cylinder head 11 and the first cylinder bottom 13 via four tie rods 14 .

[0023] The pull rod 14 connecting the first cylinder barrel 12 and the first cylinder bottom 13 is a common connection method for cylinders.

[0024] There are two telescopic mechanisms 2, and the telescopic mechanism 2 includes a telescopic mechanism cylinder 22. A telescopic mechanism cylinder cover 21 and a telescopic mechanism cylinder bottom 23 fixedly and sealedly connected to the telescopic mechanism cylinder 22 are respectively arranged on the left and right sides of the telescopic mechanism cylinder 22. A first gap 121 is formed between the outer telescopic mechanism cylinder 22 and the first cylinder 12. A first air outlet 111 communicating with the first gap 121 is arranged on the first cylinder cover 11. A first groove 132 communicating with the inner cavity of the first cylinder 12 is arranged at the center position of the first cylinder bottom 13. A first air inlet 131 communicating with the first groove 132 is arranged on the first cylinder bottom 13. The outer telescopic mechanism cylinder bottom 23 slides with the inner surface of the first cylinder 12. The outer telescopic mechanism cylinder 22 is slidably and sealably connected with the inner surface of the first cylinder head 11. The left end of the telescopic mechanism cylinder bottom 23 is sequentially provided with a first reduced diameter portion 234 of the telescopic mechanism cylinder bottom and a second reduced diameter portion 233 of the telescopic mechanism cylinder bottom. The diameter of the second reduced diameter portion 233 of the telescopic mechanism cylinder bottom is smaller than the first reduced diameter portion 234 of the telescopic mechanism cylinder bottom. The first reduced diameter portion 234 of the telescopic mechanism cylinder bottom is threadedly and sealably connected with the corresponding telescopic mechanism cylinder 22. The outer periphery of the second reduced diameter portion 233 of the telescopic mechanism cylinder bottom is sleeved with a liner 24 sealably connected thereto. The right end of the telescopic mechanism cylinder head 21 is sequentially provided with a first reduced diameter portion 234 of the telescopic mechanism cylinder head and a second reduced diameter portion 233 of the telescopic mechanism cylinder head. 12, the diameter of the second reduced diameter portion 212 of the telescopic mechanism cylinder cover is smaller than the first reduced diameter portion 213 of the telescopic mechanism cylinder cover, the first reduced diameter portion 213 of the telescopic mechanism cylinder cover is threadedly sealed and connected with the corresponding telescopic mechanism cylinder barrel 22, the left end of the liner 24 is sleeved on the outer periphery of the second reduced diameter portion 212 of the telescopic mechanism cylinder cover and is sealed and fixed thereto, a second gap 221 is formed between the liner 24 and the telescopic mechanism cylinder barrel 22, a second air inlet 211 connected to the second gap 221 is provided on the telescopic mechanism cylinder cover 21, a telescopic mechanism cylinder bottom groove 232 connected to the inner cavity of the telescopic mechanism cylinder barrel 22 is provided at the center position of the telescopic mechanism cylinder bottom 23, and the telescopic mechanism cylinder bottom 23 is also provided with a corresponding The telescopic mechanism cylinder bottom air channel 231 connected to the second gap 221 and the telescopic mechanism cylinder bottom groove 232, the inner telescopic mechanism cylinder bottom 23 is slidingly sealed with the inner surface of the outer liner 24, the inner telescopic mechanism cylinder barrel 22 is slidingly sealed with the inner surface of the outer telescopic mechanism cylinder cover 21, the piston 3 is slidingly sealed with the inner surface of the inner liner 24, the piston rod 4 is slidingly sealed with the inner surface of the inner telescopic mechanism cylinder cover 21, a third gap 241 is formed between the outer liner 24 and the inner telescopic mechanism cylinder barrel 22, and between the inner liner 24 and the piston rod 4, and a second air outlet 214 connected to the third gap 241 is provided on the telescopic mechanism cylinder cover 21.

[0025] The left side of the telescopic mechanism cylinder 22 is threadedly connected to the corresponding telescopic mechanism cylinder cover 21 , and the right side is threadedly connected to the corresponding telescopic mechanism cylinder bottom 23 .

[0026] The liner 24 is interference-connected with the second reduced diameter portion 233 of the telescopic mechanism cylinder bottom and the second reduced diameter portion 212 of the telescopic mechanism cylinder cover.

[0027] The liner tube 24 is made of stainless steel or aluminum alloy.

[0028] Liners made of stainless steel or aluminum alloy have high structural strength.

[0029] The sliding seals and thread seals of the multi-stage cylinder are correspondingly provided with sealing rings.

[0030] The sealing ring is used for sealing, which plays a role in waterproofing, dustproofing and preventing gas leakage.

[0031] Working principle:

[0032] like Figure 3 and 4 As shown, when the multi-stage cylinder of the present invention is used, the operator first connects the first air outlet 111, the first air inlet 131, the two second air inlet holes 211 and the two second air outlets 214 to the air pipes respectively, and then connects the air pipes to the high-pressure air source. When the outer telescopic mechanism 2 needs to move to the left, the operator controls the first air inlet 131 to intake air and the first air outlet 111 to exhaust air (intake flow direction: first air inlet 131----first groove 132, exhaust flow direction: first gap 121----first air outlet 111); when the outer telescopic mechanism 2 needs to move to the right, the operator controls the first air inlet 131 to exhaust air and the first air outlet 111 to intake air; when the inner telescopic mechanism 2 needs to move to the left, the operator controls the outer second air inlet 211 to intake air and the outer second air outlet 214 to exhaust air (intake flow direction: outer second air inlet 211----outer second gap 221----outer telescopic mechanism cylinder bottom air channel 231----outer telescopic mechanism cylinder bottom groove 232, exhaust flow direction: outer third gap 241----the second air outlet 214 on the outside); when the inner telescopic mechanism 2 needs to move to the right, the operator controls the outer second air inlet 211 to exhaust and the outer second air outlet 214 to intake air; when the piston 3 and the piston rod 4 need to move to the left, the operator controls the inner second air inlet 211 to intake air and the inner second air outlet 214 to exhaust air (intake direction: the inner second air inlet 211----the inner second gap 221----the inner telescopic mechanism cylinder bottom air channel 231----the inner telescopic mechanism cylinder bottom groove 232, exhaust direction: the inner third gap 241----the inner second air outlet 214); when the piston 3 and the piston rod 4 need to move to the right, the operator controls the inner second air inlet 211 to exhaust and the inner second air outlet 214 to intake air.

[0033] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement of the above embodiments made according to the technical essence of the present invention, within the spirit and principles of the present invention, without departing from the content of the technical solution of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims

1. A multi-stage cylinder, It is characterized in that The invention comprises a first cylinder (1), a plurality of telescopic mechanisms (2) nested in sequence, a piston (3), and a piston rod (4) connected to the piston (3); the first cylinder (1) comprises a first cylinder barrel (12); a first cylinder head (11) and a first cylinder bottom (13) fixedly and sealedly connected to the first cylinder barrel (12) are respectively arranged on the left and right sides of the first cylinder barrel (12); the outermost telescopic mechanism (2) is slidably and sealably connected to the inner surface of the first cylinder (1) and extends from the first cylinder head (11); the piston (3) is slidably and sealably connected to the inner surface of the innermost telescopic mechanism (2) and extends from the innermost telescopic mechanism (2); the first cylinder (1) and each telescopic mechanism (2) are independently arranged to drive the corresponding telescopic mechanism (2) or the piston. (3), the first cylinder (12) is fixedly and sealedly connected to the first cylinder head (11) and the first cylinder bottom (13) through four tie rods (14), the number of the telescopic mechanisms (2) is two, the telescopic mechanism (2) comprises a telescopic mechanism cylinder (22), the left and right sides of the telescopic mechanism cylinder (22) are respectively provided with a telescopic mechanism cylinder head (21) and a telescopic mechanism cylinder bottom (23) fixedly and sealedly connected thereto, a first gap (121) is formed between the outer telescopic mechanism cylinder (22) and the first cylinder (12), a first air outlet (111) connected to the first gap (121) is provided on the first cylinder head (11), and the center position of the first cylinder bottom (13) is provided with a first air outlet (111) connected to the inner gap (121) of the first cylinder (12). The first cylinder bottom (13) is provided with a first air inlet hole (131) which is connected to the first groove (132); the outer telescopic mechanism cylinder bottom (23) is connected to the inner surface of the first cylinder barrel (12) in a sliding and sealing manner; the outer telescopic mechanism cylinder barrel (22) is connected to the inner surface of the first cylinder head (11) in a sliding and sealing manner; the left end of the telescopic mechanism cylinder bottom (23) is provided with a first reduced diameter portion (234) of the telescopic mechanism cylinder bottom and a second reduced diameter portion (233) of the telescopic mechanism cylinder bottom in sequence; the diameter of the second reduced diameter portion (233) of the telescopic mechanism cylinder bottom is smaller than that of the first reduced diameter portion (234) of the telescopic mechanism cylinder bottom; the first reduced diameter portion (234) of the telescopic mechanism cylinder bottom is threadedly sealed with the corresponding telescopic mechanism cylinder barrel (22). The second reduced diameter portion (233) of the telescopic mechanism cylinder bottom is sleeved with a liner (24) which is sealed and fixed thereto; the right end of the telescopic mechanism cylinder cover (21) is provided with a first reduced diameter portion (213) of the telescopic mechanism cylinder cover and a second reduced diameter portion (212) of the telescopic mechanism cylinder cover in sequence; the diameter of the second reduced diameter portion (212) of the telescopic mechanism cylinder cover is smaller than the first reduced diameter portion (213) of the telescopic mechanism cylinder cover; the first reduced diameter portion (213) of the telescopic mechanism cylinder cover is threadedly and sealedly connected to the corresponding telescopic mechanism cylinder barrel (22); the left end of the liner (24) is sleeved with the outer periphery of the second reduced diameter portion (212) of the telescopic mechanism cylinder cover and is sealed and fixed thereto; a second gap (221) is formed between the liner (24) and the telescopic mechanism cylinder barrel (22);The telescopic mechanism cylinder cover (21) is provided with a second air inlet hole (211) connected to the second gap (221); the telescopic mechanism cylinder bottom (23) is provided with a telescopic mechanism cylinder bottom groove (232) connected to the inner cavity of the telescopic mechanism cylinder barrel (22) at the center position; the telescopic mechanism cylinder bottom (23) is also provided with a telescopic mechanism cylinder bottom air channel (231) connected to the corresponding second gap (221) and the telescopic mechanism cylinder bottom groove (232); the inner telescopic mechanism cylinder bottom (23) is slidably sealed with the inner surface of the outer liner (24); the inner telescopic mechanism cylinder bottom (23) is connected to the inner surface of the inner telescopic mechanism cylinder bottom (24); The mechanism cylinder barrel (22) is connected to the inner surface of the outer telescopic mechanism cylinder cover (21) in a sliding and sealing manner, the piston (3) is connected to the inner surface of the inner liner tube (24) in a sliding and sealing manner, the piston rod (4) is connected to the inner surface of the inner telescopic mechanism cylinder cover (21) in a sliding and sealing manner, a third gap (241) is formed between the outer liner tube (24) and the inner telescopic mechanism cylinder barrel (22), and between the inner liner tube (24) and the piston rod (4), and a second air outlet (214) communicating with the third gap (241) is provided on the telescopic mechanism cylinder cover (21).

2. A multi-stage cylinder as claimed in claim 1, It is characterized in that The left side of the telescopic mechanism cylinder barrel (22) is threadedly connected to the corresponding telescopic mechanism cylinder cover (21), and the right side is threadedly connected to the corresponding telescopic mechanism cylinder bottom (23).

3. A multi-stage cylinder as claimed in claim 1, It is characterized in that The liner (24) is interference-connected with the second reduced diameter portion (233) of the telescopic mechanism cylinder bottom and the second reduced diameter portion (212) of the telescopic mechanism cylinder cover.

4. A multi-stage cylinder as claimed in claim 1, It is characterized in that The liner (24) is made of stainless steel or aluminum alloy.

5. A multi-stage cylinder as claimed in claim 1, It is characterized in that The sliding seals and thread seals of the multi-stage cylinder are correspondingly provided with sealing rings.

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