Hydraulic oil cylinder and mechanical equipment

Abstract

The utility model discloses a hydraulic oil cylinder which comprises a cylinder barrel. Part of the piston assembly extends into the cylinder barrel and can move in the axial direction of the cylinder barrel, a first groove is formed in the piston assembly, and a rod cavity communicated with the first oil port is jointly formed between the piston assembly and the cylinder barrel; the stop assembly is arranged at the end, away from the piston assembly, in the cylinder barrel, and a limiting hole capable of forming a locking cavity together with the first groove is formed in the stop assembly; the unlocking piston is axially and movably arranged on the stop assembly and forms a second groove capable of forming a containing cavity together with the limiting hole, and a rodless cavity communicated with the second oil port is formed among the piston assembly, the stop assembly, the cylinder barrel and the unlocking piston; the locking ball is used for entering the locking cavity from the containing cavity or entering the containing cavity from the locking cavity under the combined action of the piston assembly, the stopping assembly and the unlocking piston. According to the hydraulic oil cylinder and the mechanical equipment, the situation of hydraulic oil leakage can be avoided, and effective self-locking can be achieved.

Description

Technical Field

[0001] This application belongs to the field of mechanical equipment technology, and specifically relates to a hydraulic cylinder and mechanical equipment. Background Technology

[0002] Hydraulic cylinders, as one of the main actuators in hydraulic systems, are widely used in various fields. Generally, after a hydraulic cylinder reaches its designated position, it needs to withstand the thrust or pull of an external load and lock under these conditions to prevent displacement. In existing cylinder locking technologies, a hydraulic lock is typically used to prevent piston rod displacement. However, the seal of a hydraulic lock is a mechanical seal, and due to processing, assembly, or wear, leakage can occur. This can easily lead to hydraulic oil in the rod chamber flowing out of the port, causing the piston rod to extend outwards and displace, thus failing to achieve effective locking. Utility Model Content

[0003] The purpose of this application is to provide a hydraulic cylinder and mechanical device that can prevent hydraulic oil leakage and achieve effective self-locking.

[0004] To achieve the above objectives, the first aspect of this application provides a hydraulic cylinder, which includes:

[0005] The cylinder barrel has a first oil port and a second oil port.

[0006] A piston assembly, a portion of which extends into the cylinder and can move axially along the cylinder, has a first groove formed on it, and a rod chamber communicating with a first oil port is formed between the piston assembly and the cylinder.

[0007] A stop assembly is located inside the cylinder at one end away from the piston assembly, and a limiting hole is formed on the stop assembly that can form a locking cavity together with the first groove;

[0008] The unlocking piston is axially movable on the stop assembly and forms a second groove that can form a receiving cavity together with the limiting hole. The piston assembly, the stop assembly, the cylinder and the unlocking piston together form a rodless cavity that communicates with the second oil port.

[0009] The locking ball is used to move from the receiving cavity into the locking cavity or from the locking cavity into the receiving cavity under the combined action of the piston assembly, the stop assembly, and the unlocking piston.

[0010] In embodiments of this application, the stop assembly includes:

[0011] A limiting cylinder is located inside the cylinder at one end away from the piston assembly. A first mounting cavity is formed inside the limiting cylinder, and a limiting hole is formed on the peripheral wall of the first mounting cavity. The unlocking piston is sleeved on the outer peripheral side of the limiting cylinder and can move along the axial direction of the limiting cylinder.

[0012] The stop shaft is disposed in the first mounting cavity and can move axially along the limiting cylinder.

[0013] In embodiments of this application, the hydraulic cylinder further includes a first sealing element disposed on the unlocking piston and used to seal the gap between the unlocking piston and the cylinder barrel.

[0014] In an embodiment of this application, a shoulder is formed at the end of the stop shaft away from the piston assembly, and a limiting end face for limiting the shoulder is formed on the cavity wall of the first mounting cavity.

[0015] In the embodiments of this application, a second mounting cavity is formed inside the stop shaft, and a third mounting cavity is formed between the unlocking piston, the limiting cylinder, and the cylinder. The hydraulic cylinder further includes:

[0016] The cylinder head is laterally mounted on the end of the cylinder barrel furthest from the piston assembly;

[0017] A first elastic element is disposed in the second mounting cavity. One end of the first elastic element abuts against the side cavity surface of the second mounting cavity, and the other end of the first elastic element abuts against the side end surface of the cylinder head.

[0018] The second elastic element is disposed in the third mounting cavity. One end of the second elastic element abuts against the side end face of the unlocking piston, and the other end of the second elastic element abuts against the side end face of the limiting cylinder.

[0019] In an embodiment of this application, a connecting hole for connecting the rodless cavity and the second mounting cavity is also formed on the stop shaft.

[0020] In the embodiments of this application, the limiting cylinder includes a snap-fit ​​portion and an extension portion. The extension portion is disposed on one side of the snap-fit ​​portion and extends into the interior of the cylinder barrel. The snap-fit ​​portion is snapped between the cylinder barrel and the cylinder head. The hydraulic cylinder also includes a second sealing element for sealing the gap between the snap-fit ​​portion and the cylinder head.

[0021] In embodiments of this application, the piston assembly includes:

[0022] Piston rod, part of which extends into the cylinder and can move axially along the cylinder;

[0023] The piston is mounted on the piston rod and located at the end of the piston rod near the stop assembly;

[0024] The locking shaft includes a connecting portion and a protrusion. The protrusion is disposed on one side of the connecting portion and protrudes laterally from the piston. A first groove is formed on the protrusion.

[0025] In embodiments of this application, the hydraulic cylinder further includes a rod head and an anti-lock sleeve. The rod head is disposed on the piston rod and located at the end of the piston rod away from the piston. The anti-lock sleeve is sleeved on the piston rod and located between the cylinder and the rod head.

[0026] A second aspect of this application provides a mechanical device including the aforementioned hydraulic cylinder.

[0027] As can be seen from the above technical solution, the hydraulic cylinder includes a cylinder barrel, a piston assembly, a stop assembly, an unlocking piston, and a locking ball. The cylinder barrel is provided with a first oil port and a second oil port. Part of the piston assembly extends into the interior of the cylinder barrel and can move axially along the cylinder barrel. A first groove is formed on the piston assembly. A rod-type cavity communicating with the first oil port is formed between the piston assembly and the cylinder barrel. The stop assembly is located at the end of the cylinder barrel away from the piston assembly. A limiting hole is formed on the stop assembly, which can form a locking cavity together with the limiting hole. The unlocking piston is axially movable and is located on the stop assembly. A second groove is formed, which can form a receiving cavity together with the first groove. A rodless cavity communicating with the second oil port is formed between the piston assembly, the stop assembly, the cylinder barrel, and the unlocking piston. The locking ball is used to enter the locking cavity from the receiving cavity or enter the receiving cavity from the locking cavity under the combined action of the piston assembly, the stop assembly, and the unlocking piston. The hydraulic cylinder has a reasonable structural design and can achieve mechanical self-locking, which can effectively prevent the piston assembly of the hydraulic cylinder from shifting in the event of internal leakage. It also has lower manufacturing costs and more stable and reliable overall pressure holding performance.

[0028] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0029] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0030] Figure 1 This is a cross-sectional schematic diagram of the hydraulic cylinder in an embodiment of this application;

[0031] Figure 2 This is a partial cross-sectional schematic diagram of the hydraulic cylinder in an embodiment of this application.

[0032] Explanation of reference numerals in the attached figures

[0033] 1. Cylinder 101 First Oil Port

[0034] 102 Second oil port 2 Piston assembly

[0035] 201 First groove 202 Piston rod

[0036] 203 Piston, 204 Locking Pin

[0037] 205 Connecting part 206 Protrusion

[0038] 3. Stop assembly 301 Limit hole

[0039] 302 Limiting sleeve; 303 First mounting cavity

[0040] 304 stop shaft, 305 shaft shoulder

[0041] 306 Limiting end face; 307 Second mounting cavity

[0042] 308 Third mounting cavity; 309 Connecting hole

[0043] 310 Snap-fit ​​part; 311 Insertion part

[0044] 312 Columnar portion 4 Locking cavity

[0045] 5. Unlock piston 501, second groove.

[0046] 6. Receiving cavity 7. Rod cavity

[0047] 8 Rodless cavity 9 Locking ball

[0048] 10 First seal 11 Cylinder head

[0049] 12 First elastic element 13 Second elastic element

[0050] 14 Second seal 15 Rod head

[0051] 16 Anti-lock sleeve 17 Guide sleeve Detailed Implementation

[0052] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0053] The embodiments of this application provide a hydraulic cylinder, such as Figures 1-2 As shown, the hydraulic cylinder includes:

[0054] Cylinder 1, which is provided with a first oil port 101 and a second oil port 102;

[0055] Piston assembly 2, part of piston assembly 2 extends into the interior of cylinder 1 and can move along the axial direction of cylinder 1, a first groove 201 is formed on piston assembly 2, and a rod chamber 7 communicating with the first oil port 101 is formed between piston assembly 2 and cylinder 1.

[0056] The stop assembly 3 is located inside the cylinder 1 at one end away from the piston assembly 2. The stop assembly 3 has a limiting hole 301 that can be formed together with the first groove 201 to form the locking cavity 4.

[0057] The unlocking piston 5 is axially movable on the stop assembly 3 and forms a second groove 501 that can together with the limiting hole 301 form a receiving cavity 6. The piston assembly 2, the stop assembly 3, the cylinder 1 and the unlocking piston 5 together form a rodless cavity 8 that communicates with the second oil port 102.

[0058] The locking ball 9 is used to move from the receiving cavity 6 into the locking cavity 4 or from the locking cavity 4 into the receiving cavity 6 under the combined action of the piston assembly 2, the stop assembly 3 and the unlocking piston 5.

[0059] Specifically, the hydraulic cylinder further includes a guide sleeve 17 and a guide sleeve 17 fastening screw. The guide sleeve 17 is disposed at the first end of the cylinder 1 and forms a threaded connection with the cylinder 1. The threaded end of the guide sleeve 17 fastening screw passes through the peripheral wall of the cylinder 1 and is threadedly connected to the guide sleeve 17 to enhance the tightness of the connection between the cylinder 1 and the guide sleeve 17. Part of the piston assembly 2 passes through the guide sleeve 17 and extends into the interior of the cylinder 1, and a rod chamber 7 is formed between the guide sleeve 17, the cylinder 1, and the piston assembly 2. In this embodiment, the locking ball 9 is a steel ball. Furthermore, the hydraulic cylinder in this embodiment also includes a sealing ring disposed on the guide sleeve 17 and used to seal the gap between the guide sleeve 17 and the piston assembly 2 to prevent hydraulic oil in the rod chamber 7 from leaking out from the gap between the guide sleeve 17 and the piston assembly 2. The opening direction of the first groove 201 (in this embodiment, the first groove 201 is an arc-shaped groove) is towards the cylinder 1. The position of the first groove 201 can change as the piston assembly 2 moves. When the first groove 201 is aligned with the limiting hole 301, the first groove 201 and the limiting hole 301 are connected and together form the locking cavity 4. The opening direction of the second groove 501 (in this embodiment, the second groove 501 is an arc-shaped groove) is away from the cylinder 1. The position of the second groove 501 can change as the unlocking piston 5 moves. When the second groove 501 is aligned with the limiting hole 301, the second groove 501 and the limiting hole 301 are connected and together form the receiving cavity 6.

[0060] When the hydraulic cylinder needs to achieve the mechanical self-locking function, hydraulic oil is input into the rod chamber 7 through the first oil port 101 (if there is hydraulic oil in the rodless chamber 8, the hydraulic oil can be discharged outward through the second oil port 102). Under the action of the hydraulic oil, the piston assembly 2 and its first groove 201 move towards the stop assembly 3. As the piston assembly 2 gradually approaches the stop assembly 3, the first groove 201 gradually aligns with the limiting hole 301. When the first groove 201 is completely aligned with the limiting hole 301, the first groove 201 and the limiting hole 301 together form the locking chamber 4. The locking ball 9 enters the locking chamber 4 from the receiving chamber 6 under the pushing action of the groove wall of the second groove 501. Part of the locking ball 9 falls into the first groove 201 (this refers to part of a single locking ball 9 falling into the first groove 201). The piston assembly 2 is locked together with the stop assembly 3 and the cylinder 1 by the locking ball 9, and the hydraulic cylinder is in a mechanical self-locking state. After the locking ball 9 enters the locking cavity 4, the unlocking piston 5 moves, and the second groove 501 and the limiting hole 301 are misaligned.

[0061] When it is necessary to release the mechanical self-locking state of the hydraulic cylinder, hydraulic oil is input into the rodless chamber 8 through the second oil port 102. Under the action of the hydraulic oil in the rodless chamber 8, the unlocking piston 5 moves, and the second groove 501 gradually aligns with the limiting hole 301. When the second groove 501 is completely aligned with the limiting hole 301, the second groove 501 and the limiting hole 301 together form the receiving cavity 6. The locking ball 9 enters the receiving cavity 6 from the locking cavity 4 under the pushing action of the groove wall of the first groove 201. Part of the locking ball 9 falls into the second groove 501 (this refers to part of a single locking ball 9 falling into the second groove 501). At this time, the piston assembly 2 can move relative to the cylinder 1. Under the action of the hydraulic oil in the rodless chamber 8, the piston assembly 2 moves away from the stop assembly 3 (at this time, the hydraulic oil in the rod chamber 7 can be discharged outward through the first oil port 101). Thus, the mechanical self-locking state of the hydraulic cylinder is released.

[0062] Compared to existing hydraulic locks, the hydraulic cylinder structure provided in this embodiment is reasonably designed and can achieve mechanical self-locking, which can effectively prevent the piston assembly 2 of the hydraulic cylinder from displacing in the event of internal leakage. Moreover, the manufacturing cost is lower, and the overall pressure holding performance is more stable and reliable.

[0063] In one embodiment of this application, the stop component 3 includes:

[0064] The limiting cylinder 302 is located inside the cylinder 1 at one end away from the piston assembly 2. A first mounting cavity 303 is formed inside the limiting cylinder 302, and a limiting hole 301 is formed on the peripheral wall of the first mounting cavity 303. The unlocking piston 5 is sleeved on the outer peripheral side of the limiting cylinder 302 and can move along the axial direction of the limiting cylinder 302.

[0065] The stop shaft 304 is disposed in the first mounting cavity 303 and can move axially along the limiting cylinder 302.

[0066] Specifically, the limiting cylinder 302 is always in a fixed state. When the first groove 201 is not aligned with the limiting hole 301 (i.e., the hydraulic cylinder is in the unlocked state), the unlocking piston 5 is in the first preset axial position, the second groove 501 and the limiting hole 301 are aligned and form the receiving cavity 6, and the locking ball 9 is in the receiving cavity 6. In this case, the stop shaft 304 is in the second preset axial position and stops the locking ball 9 to prevent the locking ball 9 from falling out of the receiving cavity 6.

[0067] When the first groove 201 is aligned with the limiting hole 301 (i.e., the hydraulic cylinder is in a mechanical self-locking state), the stop shaft 304 is in the third preset axial position, the first groove 201 and the limiting hole 301 form a locking cavity 4, and the locking ball 9 is in the locking cavity 4; the unlocking piston 5 is in the fourth preset axial position, the second groove 501 and the limiting hole 301 are misaligned, and the unlocking piston 5 stops the locking ball 9 to prevent the locking ball 9 from coming out of the locking cavity 4.

[0068] In one embodiment of this application, the stop shaft 304 has a shoulder 305 formed at the end away from the piston assembly 2, and a limiting end face 306 for limiting the shoulder 305 is formed on the cavity wall of the first mounting cavity 303.

[0069] Specifically, the stop shaft 304 also includes a columnar portion 312 located on the side of the shoulder portion 305 near the piston assembly 2. The outer diameter of the columnar portion 312 is smaller than the outer diameter of the shoulder portion 305. The first mounting cavity 303 includes a first cavity segment and a second cavity segment that are interconnected. The inner diameter of the first cavity segment is the same as the outer diameter of the columnar portion 312, and the inner diameter of the second cavity segment is the same as the outer diameter of the shoulder portion 305. The limiting end face 306 is the side end face of the second cavity segment near the first cavity segment. The shoulder portion 305 can move in the second cavity segment. When the shoulder portion 305 abuts against the limiting end face 306, the stop shaft 304 can no longer move in the direction closer to the piston assembly 2. The above arrangement can prevent the stop shaft 304 from moving too much and disengaging from the limiting cylinder 302.

[0070] In one embodiment of this application, a second mounting cavity 307 is formed inside the stop shaft 304, and a third mounting cavity 308 is formed between the unlocking piston 5, the limiting cylinder 302, and the cylinder 1. The hydraulic cylinder further includes:

[0071] The cylinder head 11 is laterally mounted on the end of the cylinder barrel 1 away from the piston assembly 2;

[0072] The first elastic element 12 is disposed in the second mounting cavity 307. One end of the first elastic element 12 abuts against the side cavity surface of the second mounting cavity 307, and the other end of the first elastic element 12 abuts against the side end surface of the cylinder head 11.

[0073] The second elastic element 13 is disposed in the third mounting cavity 308. One end of the second elastic element 13 abuts against the side end face of the unlocking piston 5, and the other end of the second elastic element 13 abuts against the side end face of the limiting cylinder 302.

[0074] Specifically, the second mounting cavity 307 is a cylindrical cavity, and the third mounting cavity 308 is an annular cavity. The first elastic element 12 and the second elastic element 13 can both be selected as springs. When the first groove 201 is not aligned with the limiting hole 301 (i.e., the hydraulic cylinder is in the unlocked state), the stop shaft 304 is simultaneously subjected to the thrust applied by the first elastic element 12 and the limiting end face 306, so that the stop shaft 304 is in the second preset axial position and stops the locking ball 9. At the same time, the second elastic element 13 is in the compressed state, and the unlocking piston 5 is simultaneously subjected to the thrust applied by the second elastic element 13 and the locking ball 9.

[0075] When the first groove 201 aligns with the limiting hole 301 (i.e., the mechanical self-locking state of the hydraulic cylinder), the first elastic element 12 is in a compressed state, and the stop shaft 304 is in a third preset axial position. The stop shaft 304 is simultaneously subjected to the thrust applied by the first elastic element 12 and the piston assembly 2 respectively. At the same time, the unlocking piston 5 is simultaneously subjected to the thrust applied by the second elastic element 13 and the piston assembly 2 respectively.

[0076] In one embodiment of this application, a connecting hole 309 is also formed on the stop shaft 304 for connecting the rodless cavity 8 and the second mounting cavity 307. Hydraulic oil can flow into or out of the second mounting cavity 307 through the connecting hole, ensuring pressure balance on both sides of the stop shaft 304 in the axial direction and reducing the energy consumption of the hydraulic system.

[0077] In one embodiment of this application, the limiting cylinder 302 includes a snap-fit ​​portion 310 and an extension portion 311. The extension portion 311 is disposed on one side of the snap-fit ​​portion 310 and extends into the interior of the cylinder barrel 1. The snap-fit ​​portion 310 is snapped between the cylinder barrel 1 and the cylinder head 11. The hydraulic cylinder also includes a second sealing member 14 for sealing the gap between the snap-fit ​​portion 310 and the cylinder head 11. The above-mentioned arrangement of the snap-fit ​​portion 310 ensures that the limiting cylinder 302 is always in a fixed state. The second sealing member 14 is disposed on the snap-fit ​​portion 310 and may be a sealing ring, which can prevent the hydraulic oil entering the second mounting cavity 307 from flowing out from the gap between the snap-fit ​​portion 310 and the cylinder head 11.

[0078] In one embodiment of this application, the hydraulic cylinder further includes a first sealing member 10 disposed on the unlocking piston 5 and used to seal the gap between the unlocking piston 5 and the cylinder 1. Specifically, the first sealing member 10 is disposed on the outer peripheral wall of the unlocking piston 5 and may be a sealing ring, which can prevent the hydraulic oil in the rodless chamber 8 from entering the third mounting chamber 308 from the gap between the unlocking piston 5 and the cylinder 1 and affecting the elongation or contraction of the second elastic member 13, thus avoiding the situation where the unlocking or locking is impossible.

[0079] In one embodiment of this application, the piston assembly 2 includes:

[0080] Piston rod 202, part of piston rod 202 extends into the interior of cylinder 1 and can move axially along cylinder 1;

[0081] Piston 203 is mounted on piston rod 202 and located at one end of piston rod 202 near stop assembly 3;

[0082] The locking pin 204 includes a connecting portion 205 and a protrusion 206. The protrusion 206 is disposed on one side of the connecting portion 205 and protrudes laterally from the piston 203. A first groove 201 is formed on the protrusion 206.

[0083] Specifically, a fourth mounting cavity is formed inside the piston 203. One end of the piston rod 202 near the stop assembly 3 extends into the fourth mounting cavity and is connected to the piston 203. The connecting part 205 is detachably disposed in the fourth mounting cavity. One end of the protrusion 206 extends into the fourth mounting cavity and is connected to the connecting part 205. The other end of the protrusion 206 protrudes out of the piston 203. A first groove 201 is formed on the outer peripheral wall of the protrusion 206 that protrudes out of the piston 203. The above arrangement facilitates the disassembly of the locking pin 204 and the piston 203 so that the locking pin 204 can be replaced after wear, which helps to extend the overall service life of the hydraulic cylinder. The piston 203 and the locking pin 204 move with the movement of the piston rod 202, and the position of the first groove 201 also changes accordingly.

[0084] In another embodiment of this application, the piston 203 and the locking pin 204 are integrally formed, which helps to reduce the manufacturing difficulty and production cost of the piston assembly 2.

[0085] In one embodiment of this application, the hydraulic cylinder further includes a rod head 15 and an anti-lock sleeve 16. The rod head 15 is disposed on the piston rod 202 and located at the end of the piston rod 202 away from the piston 203. The anti-lock sleeve 16 is sleeved on the piston rod 202 and located between the cylinder barrel 1 and the rod head 15. Specifically, the rod head 15 is disposed at the end of the piston rod 202 away from the piston 203. During the assembly stage of the hydraulic cylinder, when there is no hydraulic oil in the hydraulic cylinder but the piston rod 202 needs to be able to extend and retract freely, the anti-lock sleeve 16 prevents the piston rod 202 from fully retracting and being locked.

[0086] Another embodiment of this application provides a mechanical device that includes the hydraulic cylinder described in the above embodiments.

[0087] In the description of this application, it should be understood that 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0088] In this application, unless otherwise expressly 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 part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0089] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. 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.

[0090] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A hydraulic cylinder, characterized in that, The hydraulic cylinder includes: Cylinder (1), wherein the cylinder (1) is provided with a first oil port (101) and a second oil port (102); Piston assembly (2), part of the piston assembly (2) extends into the interior of the cylinder (1) and can move along the axial direction of the cylinder (1), a first groove (201) is formed on the piston assembly (2), and a rod chamber (7) communicating with the first oil port (101) is formed between the piston assembly (2) and the cylinder (1); A stop assembly (3) is disposed inside the cylinder (1) at one end away from the piston assembly (2). The stop assembly (3) has a limiting hole (301) that can be formed together with the first groove (201) to form a locking cavity (4). The unlocking piston (5) is axially movable on the stop assembly (3) and forms a second groove (501) that can together with the limiting hole (301) form a receiving cavity (6). The piston assembly (2), the stop assembly (3), the cylinder (1) and the unlocking piston (5) together form a rodless cavity (8) that communicates with the second oil port (102). The locking ball (9) is used to enter the locking cavity (4) from the receiving cavity (6) or from the locking cavity (4) into the receiving cavity (6) under the combined action of the piston assembly (2), the stop assembly (3) and the unlocking piston (5).

2. The hydraulic cylinder according to claim 1, characterized in that, The stop assembly (3) includes: A limiting cylinder (302) is disposed inside the cylinder (1) at one end away from the piston assembly (2). A first mounting cavity (303) is formed inside the limiting cylinder (302). A limiting hole (301) is formed on the peripheral wall of the first mounting cavity (303). The unlocking piston (5) is sleeved on the outer peripheral side of the limiting cylinder (302) and can move along the axial direction of the limiting cylinder (302). The stop shaft (304) is disposed in the first mounting cavity (303) and can move axially along the limiting cylinder (302).

3. The hydraulic cylinder according to claim 2, characterized in that, The hydraulic cylinder further includes a first seal (10) disposed on the unlocking piston (5) and used to seal the gap between the unlocking piston (5) and the cylinder (1).

4. The hydraulic cylinder according to claim 2, characterized in that, The stop shaft (304) has a shoulder (305) at one end away from the piston assembly (2), and a limiting end face (306) for limiting the shoulder (305) is formed on the cavity wall of the first mounting cavity (303).

5. The hydraulic cylinder according to claim 2, characterized in that, The stop shaft (304) has a second mounting cavity (307) inside, and a third mounting cavity (308) is formed between the unlocking piston (5), the limiting cylinder (302), and the cylinder (1). The hydraulic cylinder also includes: The cylinder head (11) is laterally mounted on one end of the cylinder barrel (1) away from the piston assembly (2); A first elastic element (12) is disposed in the second mounting cavity (307). One end of the first elastic element (12) abuts against the side cavity surface of the second mounting cavity (307), and the other end of the first elastic element (12) abuts against the side end surface of the cylinder head (11). The second elastic element (13) is disposed in the third mounting cavity (308). One end of the second elastic element (13) abuts against the side end face of the unlocking piston (5), and the other end of the second elastic element (13) abuts against the side end face of the limiting cylinder (302).

6. The hydraulic cylinder according to claim 5, characterized in that, The stop shaft (304) also has a connecting hole (309) for connecting the rodless cavity (8) and the second mounting cavity (307).

7. The hydraulic cylinder according to claim 5, characterized in that, The limiting cylinder (302) includes a snap-fit ​​part (310) and an extension part (311). The extension part (311) is disposed on one side of the snap-fit ​​part (310) and extends into the interior of the cylinder (1). The snap-fit ​​part (310) is snapped between the cylinder (1) and the cylinder head (11). The hydraulic cylinder also includes a second sealing member (14) for sealing the gap between the snap-fit ​​part (310) and the cylinder head (11).

8. The hydraulic cylinder according to any one of claims 1-7, characterized in that, The piston assembly (2) includes: Piston rod (202), part of which extends into the interior of the cylinder (1) and is movable along the axial direction of the cylinder (1); A piston (203) is disposed on the piston rod (202) and located at one end of the piston rod (202) near the stop assembly (3); The locking pin (204) includes a connecting portion (205) and a protrusion (206), the protrusion (206) being disposed on one side of the connecting portion (205) and laterally protruding from the piston (203), and the first groove (201) being formed on the protrusion (206).

9. The hydraulic cylinder according to claim 8, characterized in that, The hydraulic cylinder also includes a rod head (15) and an anti-lock sleeve (16). The rod head (15) is disposed on the piston rod (202) and located at the end of the piston rod (202) away from the piston (203). The anti-lock sleeve (16) is sleeved on the piston rod (202) and located between the cylinder (1) and the rod head (15).

10. A mechanical device, characterized in that, The mechanical equipment includes a hydraulic cylinder according to any one of claims 1-9.

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