locking cylinder

Abstract

The utility model discloses a locking oil cylinder, include: cylinder, piston piece and hydraulic stem, the cylinder has piston cavity, and the cylinder includes first cylinder cover and second cylinder cover, the first cylinder cover is located one end of the cylinder, and the second cylinder cover is located the other end of the cylinder and can be length adjustable along the axial direction, the piston piece is movably located in the piston cavity, and the periphery of piston piece has the buffer portion that projects along the radial direction, the buffer portion is configured as the initial state or compression state can be switched along the axial direction of piston piece, to form the axial buffer in the cylinder, one end of the hydraulic stem is connected with the piston piece, and the other end is movably penetrated on the second cylinder cover, the utility model discloses whole structure is simpler, has reduced assembly procedure, and the travel distance of hydraulic stem is adjustable, has improved its cooperation degree with mechanical parts.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, specifically to a locking hydraulic cylinder. Background Technology

[0002] The locking cylinder, also known as a hydraulic cylinder, is a crucial safety actuator in subway platform screen door systems. Its primary function is to provide a strong mechanical locking force after the screen door closes, ensuring the door remains absolutely closed under negative pressure, vibration, or external interference generated when trains enter or exit the station, thus protecting passenger safety. In related technologies, existing methods for cushioning and shock absorption in the cylinder typically employ springs to reduce impact. For example, in patent publication CN114562496B, an elastic element is placed between the first rod and the piston rod to achieve cushioning. However, the actual assembly process of the cylinder is complex, the assembly procedure is cumbersome, and the stroke distance of the hydraulic rod is uncontrollable, resulting in low compatibility between mechanical components. Utility Model Content

[0003] This utility model aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this utility model is to provide a locking cylinder, comprising:

[0004] The cylinder block has a piston chamber, and the cylinder block includes a first cylinder head and a second cylinder head, the first cylinder head being located at one end of the cylinder block, and the second cylinder head being located at one end of the cylinder block and adjustable in length along the axial direction;

[0005] A piston assembly is movably disposed within the piston chamber, and the piston assembly has a buffer portion protruding in the radial direction on its circumferential surface. The buffer portion is configured to be switchable to an initial state or a compressed state along the axial direction of the piston assembly to form axial buffering within the cylinder.

[0006] A hydraulic rod, one end of which is connected to the piston, and the other end which movably passes through the second cylinder head.

[0007] Preferably, the piston component includes a first thrust portion and a second thrust portion located on both sides of the buffer portion, with the first thrust portion facing the first cylinder head and the second thrust portion facing the second cylinder head.

[0008] Preferably, the piston has a connecting hole arranged in the axial direction, the hydraulic rod passes through the connecting hole and is fixed to the piston by fasteners.

[0009] Preferably, the connecting hole has a first hole segment and a second hole segment, the diameter of the first hole segment is larger than the diameter of the second hole segment, and the flange on the circumferential surface of the hydraulic rod is fitted into the first hole segment.

[0010] Preferably, the buffer portion is formed as a hollow structure, and the thickness of the first push portion and the second push portion is greater than the thickness of the buffer portion.

[0011] Preferably, the axial length of the buffer portion in the initial state is 10mm-15mm, and the axial length in the compressed state is 7mm-8mm.

[0012] Preferably, a first oil port is provided on the circumferential surface of the cylinder body, and a second oil port is provided on the first cylinder head. The first oil port is connected to the piston chamber, and the second oil port is connected to the piston chamber via the first cylinder head.

[0013] Preferably, the second cylinder head includes:

[0014] A cover body, which is detachably mounted on the cylinder body;

[0015] An adjusting ring is threadedly connected to the cover to adjust the length between the adjusting ring and the cover in the axial direction.

[0016] Preferably, the cover has an annular threaded groove, and the adjusting ring has an annular threaded portion protruding toward the cover. The annular threaded portion is used to be threaded into the annular threaded groove so that the length between the cover and the adjusting ring is adjustable.

[0017] Preferably, the inner circumferential surface of the cover has a dustproof ring, which protrudes along the radial direction of the cover.

[0018] The above-described solution of this utility model has at least the following beneficial effects:

[0019] The locking cylinder provided by this utility model has a buffer part on the piston, so that when the piston moves in the axial direction, it can switch from the initial state to the compression state through the buffer part to form axial buffer. At the same time, the length of the second cylinder head can be adjusted in the axial direction, so that when the piston and the second cylinder head are in contact, the stroke distance of the hydraulic rod can be adjusted according to the length of the second cylinder head. The overall structure is simpler, reducing the assembly process, and the adjustable stroke distance of the hydraulic rod improves its compatibility with mechanical parts.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the locking cylinder provided in the embodiment of this utility model;

[0023] Figure 2 This is a cross-sectional view of the locking cylinder provided in the embodiment of this utility model;

[0024] Figure 3 This is an exploded view of the locking cylinder provided in the embodiment of this utility model;

[0025] Figure 4 This is a schematic diagram of the piston component provided in the embodiment of this utility model;

[0026] Figure 5 This is an exploded view of the structure of the second cylinder head provided in this embodiment of the present invention;

[0027] Explanation of icon numbers:

[0028] 10. Cylinder body; 101. Piston chamber; 102. First oil port; 11. First cylinder head; 111. Second oil port; 12. Second cylinder head; 121. Cover body; 1211. Annular threaded groove; 1212. Dustproof ring; 122. Adjusting ring; 1221. Annular threaded part; 1222. Sealing part; 123. Buffer ring; 20. Piston component; 21. Buffer part; 22. First thrust part; 23. Second thrust part; 24. Connecting hole; 241. First hole section; 242. Second hole section; 30. Hydraulic rod; 31. Fastener.

[0029] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] The locking cylinder of this utility model embodiment is described in detail below with reference to the accompanying drawings.

[0036] Reference Figures 1 to 3As shown, the locking cylinder provided in this embodiment of the present invention includes: a cylinder body 10, a piston 20, and a hydraulic rod 30. The cylinder body 10 has a piston chamber 101, such that a first oil port 102 is provided on the circumferential surface of the cylinder body 10, and the first oil port 102 is connected to the piston chamber 101. The cylinder body 10 includes a first cylinder head 11 and a second cylinder head 12. The first cylinder head 11 is located at one end of the cylinder body 10. When hydraulic oil enters through the first oil port 102, the hydraulic oil enters the piston chamber 101 from the first oil port 102. At this time, the hydraulic oil is located on the side close to the second cylinder head 12. The piston 20 is movably disposed in the piston chamber 101, so that hydraulic oil can push the piston 20 toward the first cylinder head 11. The first cylinder head 11 is provided with a second oil port 111, which is connected to the piston chamber 101 via the first cylinder head 11. When hydraulic oil enters the second oil port 111, the hydraulic oil enters the piston chamber 101 through the second oil port 111. At this time, the hydraulic oil is located on the side close to the first cylinder head 11. The piston 20 is movably disposed in the piston chamber 101, so that hydraulic oil can push the piston 20 toward the second cylinder head 12.

[0037] Furthermore, the second cylinder head 12 is located at the other end of the cylinder body 10 and its length can be adjusted in the axial direction. By adjusting the axial length of the second cylinder head 12, when the piston 20 abuts against the second cylinder head 12, the stroke distance of the piston 20 can be controlled according to the axial length of the second cylinder head 12. By providing a buffer part 21 protruding in the radial direction on the circumferential surface of the piston 20, when the piston 20 abuts against the first cylinder head 11 or the second cylinder head 12, the buffer part 21 is subjected to the force from both sides by the hydraulic oil and the first cylinder head 11 or the hydraulic oil and the second cylinder head 12, thereby causing the buffer part 21 to switch from the initial state to the compression state to form axial buffer. It can be understood that one end of the hydraulic rod 30 is connected to the piston 20, and the other end is movably inserted through the second cylinder head 12, so that when the piston 20 moves in the piston cavity 101, it can drive the hydraulic rod 30 to move.

[0038] Reference Figure 2 and Figure 4 As shown, the piston component 20 includes a first push portion 22 and a second push portion 23 located on both sides of the buffer portion 21. The first push portion 22 faces the first cylinder head 11, so that when hydraulic oil enters from the second oil port 111, it can push the first push portion 22 and force the piston component 20 to move in the piston chamber 101. The second push portion 23 faces the second cylinder head 12, so that when hydraulic oil enters from the first oil port 102, it can push the second push portion 23 and force the piston component 20 to move in the piston chamber 101, thereby driving the hydraulic rod 30 to move, so that the hydraulic rod 30 can provide a strong mechanical locking force when used in places such as subway platform screen doors.

[0039] Furthermore, the piston 20 has a connecting hole 24 arranged in the axial direction. The hydraulic rod 30 passes through the connecting hole 24 and is fixed to the piston 20 by fasteners 31. When the piston 20 moves toward the second cylinder head 12, the force of the hydraulic oil is applied to the first pushing part 22 and the fasteners 31, causing the piston 20 to drive the hydraulic rod 30 to move toward the second cylinder head 12. When the piston 20 abuts against the second cylinder head 12, the buffer part 21 can form a buffer between the hydraulic oil and the second cylinder head 12. Furthermore, the connecting hole 24 has a first hole section 241 and a second hole section 242. The diameter of the first hole section 241 is larger than the diameter of the second hole section 242, and the flange on the circumferential surface of the hydraulic rod 30 is fitted into the first hole section 241. The flange and the fasteners 31 can lock the hydraulic rod 30 and the piston 20 together, so that when the piston 20 is pushed by the hydraulic oil...

[0040] Preferably, the buffer portion 21 is formed as a hollow structure, and the thickness of the first thrust portion 22 and the second thrust portion 23 is greater than the thickness of the buffer portion 21, so that the first thrust portion 22 and the second thrust portion 23 have higher load-bearing strength and can also increase the overall buffering effect of the piston component 20; furthermore, the axial length of the buffer portion 21 in the initial state is 10mm-15mm, and the axial length in the compressed state is 7mm-8mm. The axial length of the buffer portion 21 should be as small as possible while ensuring the buffering effect. Therefore, the axial length of the buffer portion 21 can be set according to the actual application scenario. For example, the axial length in the initial state is 11.2mm, and the axial length in the compressed state is 7.5mm. No limitation is made here.

[0041] Reference Figure 5 As shown, the second cylinder head 12 includes a cover body 121 and an adjusting ring 122. The cover body 121 is detachably mounted on the cylinder body 10. The adjusting ring 122 is threadedly connected to the cover body 121 to adjust the length between the adjusting ring 122 and the cover body 121 in the axial direction. The outer circumferential surface of the adjusting ring 122 can be provided with a sealing part 1222 protruding in the radial direction, so that the adjusting ring 122 can seal the hydraulic oil in the piston chamber 101 and also has a dustproof effect. Furthermore, the cover body 121 has an annular threaded groove 1211, and the adjusting ring 122 has an annular threaded part 1221 protruding toward the cover body 121. The annular threaded part 1221 is threadedly connected to the annular threaded groove 1211 so that the length between the cover body 121 and the adjusting ring 122 is adjustable.

[0042] In this embodiment, by using a threaded connection between the cover 121 and the adjusting ring 122, the stroke distance of the piston 20 is shorter when the cover 121 and the adjusting ring 122 are far apart, and the stroke distance of the piston 20 is longer when the cover 121 and the adjusting ring 122 are close together. A buffer ring 123 can be fitted around the outer periphery of the annular thread portion 1221, that is, the inner diameter of the buffer ring 123 is the same as the outer diameter of the annular thread portion 1221, and the outer diameter of the buffer ring 123 is the same as the outer diameter of the cover 121. This allows the adjusting ring 122 to enhance the load-bearing capacity of the adjusting ring 122 and the cover 121 when subjected to the pressure of the piston 20 and hydraulic oil, ensuring higher overall strength. It can be understood that the thickness of the buffer ring 123 can be selected according to the distance between the adjusting ring 122 and the cover 121.

[0043] Optionally, the inner circumferential surface of the cover 121 has a dustproof ring 1212. The dustproof ring 1212 protrudes in the radial direction of the cover 121, so that when the hydraulic rod 30 moves inside the cover 121, the dustproof ring 1212 can block external dust and prevent dust from entering the piston chamber 101 from between the cover 121 and the hydraulic rod 30, thus ensuring better overall sealing.

[0044] The locking cylinder provided by this utility model provides a buffer part 21 on the piston part 20. When the piston part 20 moves in the axial direction, the buffer part 21 can switch from the initial state to the compression state to form axial buffer. At the same time, the length of the second cylinder head 12 can be adjusted in the axial direction. When the piston part 20 abuts against the second cylinder head 12, the stroke distance of the hydraulic rod 30 can be adjusted according to the length of the second cylinder head 12. The overall structure is simpler, reducing assembly steps. Furthermore, the adjustable stroke distance of the hydraulic rod 30 improves its compatibility with mechanical components.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0046] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A locking cylinder, characterized in that, include: The cylinder block has a piston chamber, and the cylinder block includes a first cylinder head and a second cylinder head, the first cylinder head being located at one end of the cylinder block and the second cylinder head being located at the other end of the cylinder block and having an axially adjustable length. A piston assembly is movably disposed within the piston chamber, and the piston assembly has a buffer portion protruding in the radial direction on its circumferential surface. The buffer portion is configured to be switchable to an initial state or a compressed state along the axial direction of the piston assembly to form axial buffering within the cylinder. A hydraulic rod, one end of which is connected to the piston, and the other end which movably passes through the second cylinder head.

2. The locking cylinder according to claim 1, characterized in that, The piston assembly includes a first thrust portion and a second thrust portion located on both sides of the buffer portion, with the first thrust portion facing the first cylinder head and the second thrust portion facing the second cylinder head.

3. The locking cylinder according to claim 2, characterized in that, The piston has a connecting hole arranged in the axial direction, and the hydraulic rod passes through the connecting hole and is fixed to the piston by fasteners.

4. The locking cylinder according to claim 3, characterized in that, The connecting hole has a first hole section and a second hole section, the diameter of the first hole section is larger than the diameter of the second hole section, and the flange on the circumferential surface of the hydraulic rod is fitted into the first hole section.

5. The locking cylinder according to claim 2, characterized in that, The buffer portion is formed as a hollow structure, and the thickness of the first push portion and the second push portion is greater than the thickness of the buffer portion.

6. The locking cylinder according to any one of claims 1 to 5, characterized in that, The buffer section has an axial length of 10mm-15mm in the initial state and an axial length of 7mm-8mm in the compressed state.

7. The locking cylinder according to claim 1, characterized in that, The cylinder body has a first oil port on its circumference and a second oil port on the first cylinder head. The first oil port is connected to the piston chamber, and the second oil port is connected to the piston chamber via the first cylinder head.

8. The locking cylinder according to claim 1, characterized in that, The second cylinder head includes: A cover body, which is detachably mounted on the cylinder body; An adjusting ring is threadedly connected to the cover to adjust the length between the adjusting ring and the cover in the axial direction.

9. The locking cylinder according to claim 8, characterized in that, The cover has an annular threaded groove, and the adjusting ring has an annular threaded portion protruding toward the cover. The annular threaded portion is used to be threaded into the annular threaded groove so that the length between the cover and the adjusting ring is adjustable.

10. The locking cylinder according to any one of claims 8 to 9, characterized in that, The inner circumferential surface of the cover has a dustproof ring, which protrudes along the radial direction of the cover.

Images