Hydraulic guide device with locking function

Abstract

The application discloses a hydraulic guiding device with locking function and belongs to the technical field of hydraulic cylinders. Specifically, the hydraulic guiding device comprises a guide rod, a first locking assembly is arranged on the guide rod, the first locking assembly comprises a hydraulic mechanical lock assembly, the hydraulic mechanical lock assembly comprises a mounting bolt, a sleeve is fixed on the mounting bolt, a hydraulic piston capable of sliding in the sleeve is arranged on the sleeve, and the hydraulic piston is connected with the sleeve through a first spring; a lock hole opening and closing assembly comprises an oil way conversion piston arranged in the guide rod and a bayonet uniformly arranged on the guide rod along the length direction of the guide rod, and an opening and closing piece is arranged in the bayonet. The hydraulic guiding device controls the hydraulic mechanical lock assembly and the lock hole opening and closing assembly by injecting the oil inlet pressure in the hydraulic cylinder into the guide rod, so that the hydraulic cylinder piston can be instantly stayed at the set position on the guide rod, and the stability is improved.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic cylinder technology, specifically a hydraulic guide device with a locking function. Background Technology

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion.

[0003] Existing hydraulic cylinders have poor stability during use. Furthermore, during the rising and falling process of the hydraulic cylinder piston, the oil pump valve is closed to seal the oil inside the hydraulic cylinder, thus keeping the hydraulic cylinder piston stationary at a designated position. This results in poor piston stationary stability and poor locking effect. Summary of the Invention

[0004] The purpose of this invention is to provide a hydraulic guide device with a locking function to solve the problem of poor stability of existing hydraulic cylinders in use, as mentioned in the background art.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0006] This invention provides a hydraulic guide device with a locking function, applied inside a hydraulic cylinder, for guiding and locking the hydraulic cylinder piston inside the cylinder, comprising:

[0007] A guide rod has a hollow cavity formed inside it along its length. A hydraulic cylinder piston is vertically positioned inside the hydraulic cylinder and passes through it. This allows the hydraulic cylinder piston to slide only along the vertical direction of the guide rod. The guide rod is equipped with a locking assembly for locking the hydraulic cylinder piston at a predetermined position on the guide rod. The locking assembly includes:

[0008] A hydraulic mechanical lock assembly includes a mounting bolt mounted on a hydraulic cylinder piston, and a sleeve fixed on the mounting bolt. A hydraulic piston capable of sliding within the sleeve is provided on the sleeve, and the hydraulic piston and the sleeve are connected by a first spring.

[0009] A keyhole opening and closing assembly includes an oil circuit switching piston disposed in the hollow cavity of a guide rod and a plurality of bayonets evenly disposed on the guide rod along the length of the guide rod. The bayonets are provided with opening and closing elements for closing or opening the bayonets.

[0010] Preferably, the hydraulic piston is provided with a sealing rubber ring.

[0011] Preferably, the opening and closing component includes a locking hole opening and closing piston that cooperates with the bayonet and a positioning piston that slides inside the guide rod, and the locking hole opening and closing piston and the positioning piston are connected by a piston rod.

[0012] Preferably, a locking nut is provided on the piston rod, and the locking nut is connected to the positioning piston by a fourth spring.

[0013] Preferably, the longitudinal section of the positioning piston is elliptical.

[0014] Preferably, the locking assembly further includes an oil circuit assembly, which includes a first oil circuit channel disposed at the bottom end of the guide rod and a second oil circuit channel disposed at the top end of the guide rod, and also includes a third oil circuit channel and a fourth oil circuit channel located at the middle position of the guide rod. The first oil circuit channel is opened from the side of the guide rod and connects to the hollow cavity, the second oil circuit channel is opened from the top end of the guide rod and connects to the hollow cavity, and the third and fourth oil circuit channels are opened on the side of the hollow cavity inside the guide rod, and both ends of the third and fourth oil circuit channels connect to the hollow cavity.

[0015] Preferably, the bottom of the guide rod is provided with a connector for connecting the guide rod and the hydraulic cylinder. The connector includes a copper washer installed on the hydraulic cylinder, and a locking nut is provided on the copper washer. A first sealing ring is provided on the top of the locking nut, and the top of the first sealing ring is connected to the bottom end of the guide rod.

[0016] Preferably, the top of the guide rod is rotatably connected to a first threaded tube via a thread, and the bottom of the guide rod is rotatably connected to a second threaded tube via a thread.

[0017] Preferably, the oil circuit switching piston includes a fixed rod and sealing pistons located at both ends of the fixed rod, and the sealing pistons are provided with a second sealing ring.

[0018] Compared with existing technologies, one or more of the above technical solutions have the following beneficial effects:

[0019] By cooperating with the hydraulic mechanical lock assembly and the lock hole opening and closing assembly, the hydraulic mechanical lock assembly and the lock hole opening and closing assembly are controlled by the different positions and pressures of the oil injected into the guide rod. This, in turn, locks the piston of the hydraulic cylinder in the hydraulic cylinder, allowing it to stay at the set position on the guide rod, effectively improving the overall stability of the hydraulic cylinder and extending its service life. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0021] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the hydraulic mechanical lock assembly of the present invention;

[0023] Figure 3 This is a schematic diagram of the state structure of the hydraulic mechanical lock assembly of the present invention;

[0024] Figure 4 This is a schematic diagram of the internal structure of the first guide rod of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the first threaded tube of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure of the second threaded tube of the present invention;

[0027] Figure 7 This is a schematic diagram of the oil circuit switching piston of the present invention;

[0028] Figure 8 This is a schematic diagram of the keyhole opening and closing assembly of the present invention;

[0029] Figure 9 This is a schematic diagram of the connection structure between the guide rod and the hydraulic cylinder of the present invention;

[0030] In the picture:

[0031] 1. Locking assembly; 2. Lock hole opening and closing assembly; 3. Hydraulic circuit assembly; 4. Connecting parts;

[0032] 5-1 Guide rod; 5-2 Locking nut; 5-3 Copper washer; 5-4 First sealing ring; 5-5 Bayonet; 5-6 First oil passage; 5-7 Second oil passage; 5-8 Third oil passage; 5-9 Fourth oil passage; 5-10 Opening and closing element; 5-10-1 Locking hole opening and closing piston; 5-10-2 Positioning piston; 5-10-3 Fourth spring; 5-10-4 Locking nut; 5-10-5 Piston rod; 5-11 First threaded tube; 5-12 Second threaded tube; 5-13 Oil passage conversion piston; 5-13-1 Fixed rod body; 5-13-2 Sealing piston; 5-13-3 Second sealing ring;

[0033] 8. Hydraulic mechanical lock assembly; 8-1. Hydraulic piston; 8-2. Sealing rubber ring; 8-3. First spring; 8-4. Sleeve; 8-5. Mounting bolt. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0035] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0036] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0037] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0038] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0039] Please see Figures 1-9A hydraulic guide device with a locking function, applied inside a hydraulic cylinder, is used to guide and lock the hydraulic cylinder piston inside the cylinder, comprising:

[0040] The guide rod 5-1 has a hollow cavity formed inside along its length. A hydraulic cylinder piston is vertically installed inside the hydraulic cylinder and passes through it. This allows the hydraulic cylinder piston to slide only along the vertical direction of the guide rod. The guide rod 5-1 is equipped with a locking assembly 1 for locking the hydraulic cylinder piston at a set position on the guide rod. The locking assembly 1 includes:

[0041] The hydraulic mechanical lock assembly 8 includes a mounting bolt 8-5 mounted on a hydraulic cylinder piston, and a sleeve 8-4 fixed on the mounting bolt 8-5. A hydraulic piston 8-1 that can slide inside the sleeve 8-4 is provided on the sleeve 8-4. The hydraulic piston 8-1 and the sleeve 8-4 are connected by a first spring 8-3. A sealing rubber ring 8-2 is provided on the hydraulic piston 8-1.

[0042] The hydraulic piston 8-1 is used for locking and unlocking between the hydraulic cylinder piston and the guide rod 5-1; the sealing rubber ring 8-2 is used to seal the mechanical lock to prevent hydraulic oil from entering the mechanical lock; the first spring 8-3 provides a pushing force to the hydraulic piston 8-1 to overcome the oil pressure in the first oil passage 5-6, ensuring that the hydraulic piston 8-1 extends when the first oil passage 5-6 is under low oil pressure; the sleeve 8-4 is used to fix the hydraulic piston 8-1 and the first spring 8-3, and the hydraulic piston 8-1 can slide inside the sleeve 8-4; loosening the mounting bolt 8-5 is used to install the hydraulic piston 8-1, the sealing rubber ring 8-2, the first spring 8-3, and the sleeve 8-4; tightening the mounting bolt 8-5 is used to fix and seal the hydraulic piston 8-1, the sealing rubber ring 8-2, the first spring 8-3, and the sleeve 8-4.

[0043] The lock hole opening and closing assembly 2 includes an oil circuit conversion piston 5-13 disposed in the hollow cavity of the guide rod 5-1 and a plurality of bayonets 5-5 evenly disposed on the guide rod 5-1 along the length direction of the guide rod 5-1. The bayonets 5-5 are provided with opening and closing elements 5-10 for closing or opening the bayonets 5-5.

[0044] The opening and closing component 5-10 includes a locking hole opening and closing piston 5-10-1 that cooperates with the bayonet 5-5 and a positioning piston 5-10-2 that slides inside the guide rod 5-1. The locking hole opening and closing piston 5-10-1 and the positioning piston 5-10-2 are connected by a piston rod 5-10-5. A locking nut 5-10-4 is provided on the piston rod 5-10-5. The locking nut 5-10-4 and the positioning piston 5-10-2 are connected by a fourth spring 5-10-3.

[0045] To prevent interference between the piston rod 5-10-5 of the lock hole opening / closing piston 5-10-1 and the piston rod of the oil circuit switching piston 5-13, an eccentric feature is provided on the piston rod 5-10-5 to avoid movement of the piston rod of the oil circuit switching piston 5-13. See details... Figure 7 Furthermore, the longitudinal section of the positioning piston 5-10-2 is elliptical, ensuring that the locking hole opening and closing piston 5-10-1 will only move towards the inside of the bayonet 5-5 and will not rotate itself. At the same time, when the locking hole opening and closing piston 5-10-1 is fully engaged in the inside of the bayonet 5-5, the outer surface of the locking hole opening and closing piston 5-10-1 should maintain the same curvature as the outer surface of the guide rod 5-1, thereby ensuring the smoothness of the roundness of the guide rod 5-1 surface when the locking hole opening and closing piston 5-10-1 extends to close the bayonet 5-5.

[0046] In addition, the locking nut 5-10-4 is threaded into the guide rod 5-1 to seal the fourth spring 5-10-3 and the positioning piston 5-10-2; the fourth spring 5-10-3 generates a spring force on the positioning piston 5-10-2, so that the locking hole opening and closing piston 5-10-1 is in a retracted state when there is no oil pressure; the mating surfaces of the first threaded tube 5-11, the second threaded tube 5-12 and the oil circuit conversion piston 5-13 are all provided with magnets, which have a certain magnetic force on the oil circuit conversion piston 5-13 and can overcome the weight of the oil circuit conversion piston 5-13 itself.

[0047] Please refer to this carefully. Figure 1 As shown, the locking assembly 1 also includes an oil circuit assembly 3. The oil circuit assembly 3 includes a first oil circuit channel 5-6 disposed at the bottom end of the guide rod 5-1 and a second oil circuit channel 5-7 disposed at the top end of the guide rod 5-1. It also includes a third oil circuit channel 5-8 and a fourth oil circuit channel 5-9 located in the middle of the guide rod 5-1.

[0048] The oil circuit switching piston 5-13 includes a fixed rod body 5-13-1 and sealing pistons 5-13-2 located at both ends of the fixed rod body 5-13-1, and a second sealing rubber ring 5-13-3 is provided on the sealing piston 5-13-2;

[0049] The second sealing ring 5-13-3 has a double-layer structure, which can further improve the sealing performance. The sealing piston 5-13-2 is provided with a sealing ring groove for the second sealing ring 5-13-3 to be fitted, making it more convenient to use.

[0050] The top of the guide rod 5-1 is connected to the first threaded tube 5-11 by a threaded rotatable connection, and the bottom of the guide rod 5-1 is connected to the second threaded tube 5-12 by a threaded rotatable connection.

[0051] Specifically, to facilitate the setting of the oil circuit switching piston 5-13 and the connection of the oil circuit, the present invention sets the guide rod 5-1 as a hollow structure, and threads are provided on the upper and lower sides of the inner wall of its cavity. The upper thread is used to connect with the first threaded tube 5-11, and the lower thread is used to connect with the second threaded tube 5-12. This design facilitates the adjustment and assembly of the oil circuit switching piston 5-13, and the oil circuit switching piston 5-13 can be positioned through the first threaded tube 5-11 and the second threaded tube 5-12. At the same time, the cavity in the upper thread forms the second oil circuit channel 5-7, and a channel hole communicating with the cavity in the lower thread is opened on the side of the lower end of the guide rod 5-1. This hole is the first oil circuit channel 5-6. Note that the oil circuit channel 5-6 will not be blocked by the second threaded tube 5-12. For example, the second threaded tube 5-12 can be hollowed out or a hole for oil passage can be opened around its circumference, which will not be elaborated here.

[0052] In addition, according to Figure 1 It can be seen that the oil circuit switching piston 5-13 is located in the unthreaded cavity in the middle of the guide rod. After the first threaded tube 5-11 and the second threaded tube 5-12 are installed, the oil circuit switching piston 5-13 can only move between the two. The uppermost locking slot 5-5 on the guide rod 5-1 corresponds to the upper threaded cavity, and the oil circuit switching piston 5-13 cannot engage with it. The same applies to the lowermost locking slot 5-5 on the guide rod 5-1. Furthermore, the opening and closing element 5-10 is only located in the middle of the parts other than the uppermost and lowermost locking slots 5-5. Within the bayonet 5-5 at the position; simultaneously, when the upper end of the oil circuit switching piston 5-13 abuts against the lower end of the first threaded pipe 5-11, the third oil circuit channel 5-8 is blocked, causing the space in the middle of the oil circuit switching piston 5-13 to be unable to connect with the space inside the first threaded pipe 5-11, while the fourth oil circuit channel 5-9 is not blocked at this time. Similarly, when the lower end of the oil circuit switching piston 5-13 abuts against the upper end of the second threaded pipe 5-12, the third oil circuit channel 5-8 is not blocked, while the fourth oil circuit channel 5-9 is blocked.

[0053] Therefore, based on the above settings and references Figures 1-9 Therefore, the specific principle of guide rod 5-1 is as follows:

[0054] In the initial state, the hydraulic cylinder piston is located at the bottom of the hydraulic cylinder. Therefore, the hydraulic oil pressure in the hydraulic cylinder is relatively small. The hydraulic piston 8-1 in the hydraulic mechanical lock assembly 8 is subjected to the spring force of the first spring 8-3, which is greater than the pressure of the hydraulic oil from the first oil passage 5-6. Under the action of the first spring 8-3, the hydraulic piston 8-1 extends into the latch 5-5 of the first oil passage 5-6, locking the hydraulic cylinder piston and the guide rod 5-1 together and preventing them from moving.

[0055] When high-pressure oil is injected into the cavity below the hydraulic cylinder piston in the hydraulic cylinder, the high-pressure oil pushes the hydraulic piston 8-1 in the hydraulic mechanical lock assembly 8 to retract into the sleeve 8-4 through the first oil passage 5-6, so that the hydraulic cylinder piston in the hydraulic cylinder is unlocked from the guide rod 5-1, thereby causing the hydraulic cylinder piston to rise.

[0056] Subsequently, the above state will continue. At this time, the high-pressure oil pushes the oil circuit switching piston 5-13 upward, sealing the first threaded pipe 5-11 and the third oil circuit channel 5-8, and the upper oil circuit is sealed. At the same time, the high-pressure oil enters the area between the two sealing pistons 5-13-2 in the oil circuit switching piston 5-13 through the fourth oil circuit channel 5-9, pushing the locking hole opening and closing piston 5-10-1 to overcome the elastic force of the fourth spring 5-10-3 and extend, so that the bayonet 5-5 is in a filled state. When the hydraulic cylinder piston drives the hydraulic mechanical lock assembly 8 through the bayonet 5-5, it will not enter the bayonet 5-5 to lock, but will continue to move upward. When the hydraulic cylinder piston experiences fluctuations in the inlet oil pressure or a sudden decrease in pressure, the piston position needs to be locked immediately to prevent the hydraulic cylinder from being affected by the fluctuations in inlet oil pressure and to improve the stability of the hydraulic cylinder. In order to keep the hydraulic cylinder piston in the set position in the middle of the guide rod 5-1, when the inlet oil pressure decreases, the pressure in the area between the two sealing pistons 5-13-2 in the oil circuit switching piston 5-13 decreases. The locking hole opening and closing piston 5-10-1 retracts under the action of the fourth spring 5-10-3, and the bayonet 5-5 in the middle of the guide rod 5-1 is in the open state. When the hydraulic cylinder piston drives the hydraulic mechanical lock assembly 8 through the bayonet 5-5, the hydraulic piston 8-1 in the hydraulic mechanical lock assembly 8 will enter the bayonet 5-5 and lock. Therefore, the elastic coefficient of the fourth spring 5-10-3 can be adjusted according to the inlet oil pressure under the rated working condition. The pressure adjustment can be achieved by turning the locking nut 5-10-4.

[0057] If the hydraulic cylinder piston does not need to remain in the middle position of the guide rod 5-1, then after the hydraulic cylinder piston reaches its highest position, it stops extending upwards. At this time, since the second oil passage 5-7 is a low-pressure area, which is connected to the uppermost locking slot 5-5, the hydraulic piston 8-1 will enter the locking slot 5-5. The hydraulic piston 8-1 is subjected to the spring force of the first spring 8-3, which is greater than the hydraulic oil pressure in the locking slot 5-5. Therefore, the hydraulic piston 8-1 will extend into the locking slot 5-5 of the second oil passage 5-7, locking the hydraulic cylinder piston and guide rod 5-1, preventing the hydraulic cylinder from moving due to accidental pressure leakage of hydraulic oil.

[0058] At this point, the hydraulic cylinder extension process ends, the hydraulic cylinder piston is supported and pressed by high-pressure oil, and the hydraulic mechanical lock assembly 8 locks the hydraulic cylinder piston at any time, which is both stable and efficient.

[0059] Conversely, when high-pressure oil is filled into the second oil passage 5-7, the first oil passage 5-6 is in a low-pressure zone. This is the pressure relief process of the hydraulic cylinder, meaning that high-pressure oil enters the piston rod chamber of the hydraulic cylinder, while low-pressure oil returns to the rodless chamber. Therefore, the high-pressure oil entering the second oil passage 5-7 causes the oil passage switching piston 5-13 to move downward, closing the lower oil passage in the guide rod 5-1 and opening the upper oil passage, thereby causing the hydraulic cylinder piston to move downward. Specifically, the working principle of the lock hole opening and closing assembly 2 is the same as above, and will not be repeated here.

[0060] In particular, multiple lock hole opening and closing components 2 can be installed on the guide rod 5-1 as needed. When the distance between the lock hole opening and closing components 2 decreases, such as when they are close together, the purpose of locking the hydraulic cylinder piston at almost any position can be achieved.

[0061] Please refer to this carefully. Figure 1 As shown, a connector 4 is provided at the bottom of the guide rod 5-1. The connector 4 is used to connect the guide rod 5-1 and the hydraulic cylinder. The connector 4 includes a copper gasket 5-3 installed on the hydraulic cylinder. A locking nut 5-2 is provided on the copper gasket 5-3. A first sealing ring 5-4 is provided on the top of the locking nut 5-2. The top of the first sealing ring 5-4 is connected to the bottom end of the guide rod 5-1.

[0062] The guide rod 5-1 prevents the hydraulic cylinder piston inside the hydraulic cylinder from rotating, ensuring accurate positioning and connection of each oil passage; the locking nut 5-2 is installed on the inner bottom end of the hydraulic cylinder to fix the guide rod 5-1; the copper gasket 5-3 strengthens the clamping and fixing of the guide rod 5-1; the first sealing ring 5-4 is used to seal the corresponding piston assembly.

[0063] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A hydraulic guiding device with a locking function, applied inside a hydraulic cylinder, for guiding and locking the hydraulic cylinder piston inside the hydraulic cylinder, characterized in that, include: A guide rod has a hollow cavity formed inside it along its length. The guide rod is vertically positioned inside the hydraulic cylinder and passes through the hydraulic cylinder piston, allowing the piston to slide only along the vertical direction of the guide rod. A locking assembly is provided on the guide rod to lock the hydraulic cylinder piston at a predetermined position. The locking assembly includes: A hydraulic mechanical lock assembly includes a mounting bolt mounted on a hydraulic cylinder piston, and a sleeve fixed on the mounting bolt. A hydraulic piston capable of sliding within the sleeve is provided on the sleeve, and the hydraulic piston and the sleeve are connected by a first spring. A keyhole opening and closing assembly includes an oil circuit switching piston disposed in the hollow cavity of a guide rod and a plurality of bayonets evenly disposed on the guide rod along the length of the guide rod, wherein the bayonets are provided with opening and closing elements for closing or opening the bayonets. The opening and closing component includes a locking hole opening and closing piston that cooperates with the bayonet and a positioning piston that slides inside the guide rod. The locking hole opening and closing piston and the positioning piston are connected by a piston rod. The hydraulic piston is equipped with a sealing rubber ring.

2. The hydraulic guide device with locking function according to claim 1, characterized in that: A locking nut is provided on the piston rod, and the locking nut is connected to the positioning piston by a fourth spring.

3. The hydraulic guide device with locking function according to claim 2, characterized in that: The longitudinal section of the positioning piston is elliptical.

4. The hydraulic guide device with locking function according to claim 3, characterized in that: The locking assembly further includes an oil circuit assembly, which includes a first oil circuit channel disposed at the bottom end of the guide rod and a second oil circuit channel disposed at the top end of the guide rod, as well as a third oil circuit channel and a fourth oil circuit channel located in the middle of the guide rod. The first oil circuit channel is opened from the side of the guide rod and connects to the hollow cavity, the second oil circuit channel is opened from the top end of the guide rod and connects to the hollow cavity, and the third and fourth oil circuit channels are opened on the side of the hollow cavity inside the guide rod, with both ends of the third and fourth oil circuit channels connecting to the hollow cavity.

5. The hydraulic guide device with locking function according to claim 4, characterized in that: The bottom of the guide rod is provided with a connector for connecting the guide rod and the hydraulic cylinder. The connector includes a copper washer installed on the hydraulic cylinder and a locking nut is provided on the copper washer. The top of the locking nut is provided with a first sealing ring and the top of the first sealing ring is connected to the bottom end of the guide rod.

6. The hydraulic guide device with locking function according to claim 5, characterized in that: The top of the guide rod is rotatably connected to a first threaded tube via a thread, and the bottom of the guide rod is rotatably connected to a second threaded tube via a thread.

7. The hydraulic guide device with locking function according to claim 6, characterized in that: The oil circuit switching piston includes a fixed rod and sealing pistons located at both ends of the fixed rod, and a second sealing ring is provided on the sealing piston.

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