A multi-stage stroke hydraulic cylinder

Abstract

The application relates to a multi-stage stroke hydraulic cylinder which comprises a cylinder body provided with an oil outlet and an oil inlet, a plurality of ring bodies which are sequentially nested and are sealingly and slidably connected between adjacent ring bodies, the outermost ring body being sealingly and slidably connected with the cylinder body, a piston rod which is sealingly and slidably connected with the innermost ring body and is hollow to form a cavity, a plurality of positioning keys which are connected with the piston rod and the outer wall of the ring body and are arranged on the piston rod and the outer wall of the ring body, a plurality of limiting keys which are connected with the inner walls of the cylinder body and the ring body and are arranged on the inner walls of the cylinder body and the ring body, and the two positioning keys on the same side are located between the two limiting keys, the limiting keys and the positioning keys are arranged in one-to-one correspondence, and the limiting key and the corresponding positioning key can abut. The arrangement of the plurality of ring bodies shortens the oil circuit of the hydraulic oil, reduces the oil filling time, and improves the response speed of the multi-stage cylinder.

Description

Technical Field

[0001] This application relates to the technical field of hydraulic cylinder manufacturing, and in particular to a multi-stage stroke hydraulic cylinder. Background Technology

[0002] Hydraulic cylinders are the core actuators in hydraulic systems. They convert hydraulic energy into mechanical energy through hydraulic pressure, enabling linear reciprocating motion or oscillation.

[0003] In related technologies, such as Chinese patent publication number CN113007175A, a double-acting multi-stage hydraulic cylinder with a built-in telescopic oil pipe is proposed. This includes an oil port A, an oil port B, a first-stage cylinder base, a first-stage cylinder lifting oil chamber, a first-stage cylinder centrally located oil pipe, a first-stage cylinder piston, a second-stage cylinder lifting oil chamber, a second-stage cylinder centrally located oil pipe, a second-stage cylinder piston, a third-stage cylinder lifting oil chamber, a third-stage cylinder centrally located oil pipe, a third-stage cylinder piston, a second-stage cylinder lifting oil chamber passage, a third-stage cylinder lifting oil chamber passage, a third-stage cylinder contraction oil chamber passage, a third-stage cylinder contraction oil chamber, a second-stage cylinder contraction oil chamber passage, a second-stage cylinder contraction oil chamber, a first-stage cylinder contraction oil chamber passage, a third-stage cylinder contraction oil chamber, and a third-stage cylinder contraction oil chamber. The piston rod of the cylinder, the multi-stage hydraulic cylinder is an n-stage hydraulic cylinder n≥2, and a central oil pipe is installed axially at the axial position inside the three-stage hydraulic cylinder to supply oil to the contraction chamber of the three-stage hydraulic cylinder. Each stage consists of a cylinder body, a base (piston) and a central oil pipe. When the three-stage hydraulic cylinder is lifted, the hydraulic oil enters the lifting oil chamber of the first stage cylinder from the oil port A, first lifting the piston of the first stage cylinder upward. Then the hydraulic oil enters the lifting oil chamber of the second stage cylinder through the oil passage of the second stage cylinder, lifting the piston of the second stage cylinder upward. Then it enters the lifting oil chamber of the third stage cylinder through the oil passage of the third stage cylinder, lifting the piston of the third stage cylinder upward. The residual oil in each stage contraction oil chamber enters the central oil pipe through the contraction oil chamber oil passage and flows out of the oil port B.

[0004] The aforementioned technologies have the following drawbacks: the hydraulic oil circuit is lengthy, and it takes a long time for the oil to fill each stage of the cavity, resulting in a slow response of the multi-stage cylinder. Utility Model Content

[0005] To address the issue of long hydraulic oil circuits and slow response of multi-stage cylinders due to the extended time required for oil to fill each stage of the cylinder, this application provides a multi-stage stroke hydraulic cylinder.

[0006] This application provides a multi-stage stroke hydraulic cylinder, which adopts the following technical solution:

[0007] A multi-stage stroke hydraulic cylinder, comprising:

[0008] The cylinder block is equipped with an oil outlet and an oil inlet;

[0009] The ring body is provided in multiple ways, and the multiple ring bodies are nested in sequence, with adjacent ring bodies being sealed and slidingly connected. The outermost ring body is sealed and slidingly connected to the cylinder body.

[0010] The piston rod is slidably and sealed to the innermost ring, and the piston rod is hollow to form a cavity;

[0011] There are multiple positioning keys, which are connected to the piston rod and the outer wall of the ring body, and two positioning keys are provided on both the piston rod and the outer wall of the ring body.

[0012] There are multiple limit keys, which are connected to the inner walls of the cylinder and the ring. Two limit keys are provided on the inner walls of both the cylinder and the ring. Two positioning keys on the same side are located between the two limit keys. The limit keys and positioning keys are set one-to-one, and the limit keys and the corresponding positioning keys can abut against each other.

[0013] Furthermore, a partition is provided inside the cavity of the piston rod, and the partition is fixedly connected to the inner wall of the cavity, dividing the cavity into a hollow chamber and a drive chamber, the drive chamber being connected to the oil outlet and the oil inlet.

[0014] Furthermore, the bottom of both the inner and outer walls of the piston rod and the ring are chamfered.

[0015] Furthermore, oil ports are provided on both the sidewall of the ring body and the sidewall of the piston rod.

[0016] Furthermore, two oil seals are provided on the inner walls of both the cylinder and the ring.

[0017] Furthermore, each cylinder body is provided with a first guide ring, which is an L-shaped guide ring and is located between the two oil seals.

[0018] Furthermore, there are two first guide rings, and the short sides of the two first guide rings are arranged to abut each other.

[0019] In summary, the beneficial technical effects of this application are as follows: the arrangement of multiple rings shortens the hydraulic oil circuit, reduces the oil filling time, and improves the response speed of the multi-stage cylinder. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0021] Reference numerals: 100, cylinder block; 110, oil seal; 111, mounting groove; 120, dustproof ring; 121, dustproof groove; 130, first guide ring; 131, first receiving groove; 140, second guide ring; 141, second receiving groove; 200, ring body; 300, piston rod; 310, partition plate; 320, hollow chamber; 330, drive chamber; 400, limit key; 410, limit groove; 500, positioning key; 510, positioning groove; 600, oil port. Detailed Implementation

[0022] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] This application discloses a multi-stage stroke hydraulic cylinder. (Refer to...) Figure 1 The multi-stage stroke hydraulic cylinder includes a cylinder body 100, a ring body 200, a piston rod 300, a limit key 400, and a positioning key 500.

[0024] The cylinder body 100 is provided with an oil outlet and an oil inlet. Multiple ring bodies 200 are provided, and these ring bodies 200 are sequentially nested, with adjacent ring bodies 200 being sealed and slidingly connected. The cylinder body 100 is fitted onto the outermost ring body 200 and is sealed and slidingly connected to it. In this embodiment, four ring bodies 200 are provided. The piston rod 300 is sealed and slidingly connected to the innermost ring body 200, and the piston rod 300 is hollow, forming a cavity. To further reduce the length of the oil passage, a partition 310 is provided inside the piston rod 300. The partition 310 is fixedly connected to the inner circumferential wall of the piston rod 300, dividing the cavity of the piston rod 300 into a hollow chamber 320 and a drive chamber 330. The drive chamber 330 communicates with the oil inlet and the oil outlet.

[0025] Both the cylinder body 100 and the ring body 200 have two mounting grooves 111 on their inner walls. These grooves are located on the side of the cylinder body 100 and the ring body 200 away from the bottom of the cylinder body 100. Each groove 111 contains an oil seal 110, and the inner walls of both oil seals 110 abut against the outer peripheral wall of the corresponding ring body 200 or piston rod 300. Both the cylinder body 100 and the ring body 200 have dustproof grooves 121 on their inner walls. These grooves are located on the side of the mounting grooves 111 away from the cylinder bottom, and dustproof rings 120 are installed within them. The inner walls of the dustproof rings 120 abut against the outer peripheral wall of the corresponding ring body 200 or piston rod 300. Both the cylinder body 100 and the ring body 200 have two first receiving grooves 131 on their inner walls. One first receiving groove 131 is located on the side of the corresponding mounting groove 111 near the bottom of the cylinder, and the other first receiving groove 131 is located between the two corresponding mounting grooves 111. Each first receiving groove 131 has two first guide rings 130 installed in it. The first guide rings 130 are L-shaped guide rings, and the short sides of the two first guide rings 130 are set to abut against each other. The first guide rings 130 abut against the outer peripheral wall of the ring body 200 or the piston rod 300 on the corresponding side.

[0026] Two second receiving grooves 141 are provided on the outer wall of the ring body 200 and the piston rod 300 near the bottom of the cylinder body 100. The two second receiving grooves 141 are spaced apart, and a second guide ring 140 is installed in each second receiving groove 141. The second guide rings 140 abut against the inner wall of the cylinder body 100 and the inner wall of the ring body 200 on the corresponding side.

[0027] A gap is formed between the piston rod 300 and the innermost ring 200, between adjacent rings 200, and between the outermost ring 200 and the cylinder 100. Multiple positioning keys 500 are provided, and two positioning grooves 510 are formed on the outer walls of the piston rod 300 and the multiple rings 200. The two positioning grooves 510 are located on either side of two second receiving grooves 141 within the same gap, and one positioning key 500 is installed in each positioning groove 510. The side of the positioning key 500 away from the bottom of the positioning groove 510 extends beyond the positioning groove 510. Two limiting grooves 410 are formed on the outer walls of the piston rod 300 and the rings 200. One limiting groove 410 is located on the side of the second receiving groove 141 near the bottom of the cylinder 100, and the other limiting groove 410 is located on the side of the oil seal 110 near the bottom of the cylinder 100 within the same gap. Multiple limit keys 400 are provided. One limit key 400 is installed in each limit groove 410, and two limit keys 400 are spaced apart. Two positioning keys 500 are located between the two limit keys 400. The two limit keys 400 and the two positioning keys 500 located in the same gap are set one-to-one, and the limit key 400 and the corresponding positioning key 500 can abut. When the limit key 400 farther from the bottom of the cylinder body 100 abuts with the corresponding positioning key 500, the corresponding ring 200 or piston rod 300 extends out of the cylinder body 100. When the limit key 400 closer to the bottom of the cylinder body 100 abuts with the corresponding positioning key 500, the corresponding ring 200 or piston rod 300 retracts into the cylinder body 100.

[0028] The bottom of the inner and outer walls of the piston rod 300 and the ring 200 are chamfered to reduce the resistance encountered by the piston rod 300 and the ring 200 when they extend.

[0029] Oil ports 600 are provided on the side walls of both the ring body 200 and the piston rod 300, and one oil port 600 is provided on the piston rod 300. The oil port 600 communicates with the drive chamber 330 and is located between the locating key 500 and the second guide ring 140, so that the hydraulic oil in the drive chamber 330 can enter between the locating key 500 and the second guide ring 140 to lubricate the sliding trajectory of the second guide ring 140. Multiple ring bodies 200 each have two oil ports 600, one located between the locating key 500 and the second guide ring 140, and the other oil port 600 located on the side of the locating key 500 away from the bottom of the cylinder body 100.

[0030] The implementation principle of a multi-stage stroke hydraulic cylinder in this application embodiment is as follows: hydraulic oil enters the drive chamber 330 of the piston rod 300 from the oil inlet 600, causing the piston rod 300 to extend out of the cylinder body 100. When the positioning key 500 on the outside of the piston rod 300 abuts against the limit key 400 on the side away from the bottom of the cylinder body 100, the piston rod 300 sequentially drives multiple rings 200 to move and extend out of the cylinder body 100, thereby realizing the operation of the multi-stage stroke hydraulic cylinder.

[0031] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A multi-stage stroke hydraulic cylinder, characterized in that, include: The cylinder block (100) is provided with an oil outlet and an oil inlet; Multiple ring bodies (200) are provided, and multiple ring bodies (200) are nested in sequence, and adjacent ring bodies (200) are sealed and slidingly connected. The outermost ring body (200) is sealed and slidingly connected to the cylinder body (100). The piston rod (300) is sealed and slidably connected to the innermost ring (200), and the piston rod (300) is hollow to form a cavity; Multiple positioning keys (500) are provided and connected to the outer wall of the piston rod (300) and the ring body (200), and two positioning keys (500) are provided on the outer wall of both the piston rod (300) and the ring body (200). Multiple limit keys (400) are provided and connected to the inner walls of the cylinder (100) and the ring (200). Two limit keys (400) are provided on the inner walls of both the cylinder (100) and the ring (200). Two positioning keys (500) located on the same side are located between the two limit keys (400). The limit keys (400) and the positioning keys (500) are set one-to-one, and the limit keys (400) and the corresponding positioning keys (500) can abut against each other.

2. A multi-stage stroke hydraulic cylinder according to claim 1, characterized in that, The piston rod (300) has a partition (310) inside its cavity, and the partition (310) is fixedly connected to the inner wall of the cavity, dividing the cavity into a hollow chamber (320) and a drive chamber (330). The drive chamber (330) is connected to the oil outlet and the oil inlet.

3. A multi-stage stroke hydraulic cylinder according to claim 1, characterized in that, The bottom of the inner and outer walls of the piston rod (300) and the ring (200) are chamfered.

4. A multi-stage stroke hydraulic cylinder according to claim 1, characterized in that, Oil ports (600) are provided on the side wall of the ring (200) and the side wall of the piston rod (300).

5. A multi-stage stroke hydraulic cylinder according to claim 1, characterized in that, Two oil seals (110) are provided on the inner walls of both the cylinder (100) and the ring (200).

6. A multi-stage stroke hydraulic cylinder according to claim 5, characterized in that, Each cylinder (100) is provided with a first guide ring (130) on its inner wall. The first guide ring (130) is an L-shaped guide ring and is located between two oil seals (110).

7. A multi-stage stroke hydraulic cylinder according to claim 6, characterized in that, There are two first guide rings (130), and the short sides of the two first guide rings (130) are in contact with each other.

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